src/core/service.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <signal.h>
  24 #include <dirent.h>
  25 #include <unistd.h>
  26 #include <sys/reboot.h>
  27 #include <linux/reboot.h>
  28 #include <sys/syscall.h>
  29
  30 #include "manager.h"
  31 #include "unit.h"
  32 #include "service.h"
  33 #include "load-fragment.h"
  34 #include "load-dropin.h"
  35 #include "log.h"
  36 #include "strv.h"
  37 #include "unit-name.h"
  38 #include "unit-printf.h"
  39 #include "dbus-service.h"
  40 #include "special.h"
  41 #include "exit-status.h"
  42 #include "def.h"
  43 #include "path-util.h"
  44 #include "util.h"
  45 #include "utf8.h"
  46 #include "env-util.h"
  47 #include "fileio.h"
  48 #include "bus-error.h"
  49 #include "bus-util.h"
  50
  51 #ifdef HAVE_SYSV_COMPAT
  52
  53 #define DEFAULT_SYSV_TIMEOUT_USEC (5*USEC_PER_MINUTE)
  54
  55 typedef enum RunlevelType {
  56         RUNLEVEL_UP,
  57         RUNLEVEL_DOWN
  58 } RunlevelType;
  59
  60 static const struct {
  61         const char *path;
  62         const char *target;
  63         const RunlevelType type;
  64 } rcnd_table[] = {
  65         /* Standard SysV runlevels for start-up */
  66         { "rc1.d",  SPECIAL_RESCUE_TARGET,    RUNLEVEL_UP },
  67         { "rc2.d",  SPECIAL_RUNLEVEL2_TARGET, RUNLEVEL_UP },
  68         { "rc3.d",  SPECIAL_RUNLEVEL3_TARGET, RUNLEVEL_UP },
  69         { "rc4.d",  SPECIAL_RUNLEVEL4_TARGET, RUNLEVEL_UP },
  70         { "rc5.d",  SPECIAL_RUNLEVEL5_TARGET, RUNLEVEL_UP },
  71
  72         /* Standard SysV runlevels for shutdown */
  73         { "rc0.d",  SPECIAL_POWEROFF_TARGET,  RUNLEVEL_DOWN },
  74         { "rc6.d",  SPECIAL_REBOOT_TARGET,    RUNLEVEL_DOWN }
  75
  76         /* Note that the order here matters, as we read the
  77            directories in this order, and we want to make sure that
  78            sysv_start_priority is known when we first load the
  79            unit. And that value we only know from S links. Hence
  80            UP must be read before DOWN */
  81 };
  82
  83 #define RUNLEVELS_UP "12345"
  84 #endif
  85
  86 static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
  87         [SERVICE_DEAD] = UNIT_INACTIVE,
  88         [SERVICE_START_PRE] = UNIT_ACTIVATING,
  89         [SERVICE_START] = UNIT_ACTIVATING,
  90         [SERVICE_START_POST] = UNIT_ACTIVATING,
  91         [SERVICE_RUNNING] = UNIT_ACTIVE,
  92         [SERVICE_EXITED] = UNIT_ACTIVE,
  93         [SERVICE_RELOAD] = UNIT_RELOADING,
  94         [SERVICE_STOP] = UNIT_DEACTIVATING,
  95         [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
  96         [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
  97         [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
  98         [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  99         [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
 100         [SERVICE_FAILED] = UNIT_FAILED,
 101         [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
 102 };
 103
 104 /* For Type=idle we never want to delay any other jobs, hence we
 105  * consider idle jobs active as soon as we start working on them */
 106 static const UnitActiveState state_translation_table_idle[_SERVICE_STATE_MAX] = {
 107         [SERVICE_DEAD] = UNIT_INACTIVE,
 108         [SERVICE_START_PRE] = UNIT_ACTIVE,
 109         [SERVICE_START] = UNIT_ACTIVE,
 110         [SERVICE_START_POST] = UNIT_ACTIVE,
 111         [SERVICE_RUNNING] = UNIT_ACTIVE,
 112         [SERVICE_EXITED] = UNIT_ACTIVE,
 113         [SERVICE_RELOAD] = UNIT_RELOADING,
 114         [SERVICE_STOP] = UNIT_DEACTIVATING,
 115         [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
 116         [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
 117         [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
 118         [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
 119         [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
 120         [SERVICE_FAILED] = UNIT_FAILED,
 121         [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
 122 };
 123
 124 static int service_dispatch_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
 125 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
 126 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata);
 127
 128 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f);
 129
 130 static void service_init(Unit *u) {
 131         Service *s = SERVICE(u);
 132
 133         assert(u);
 134         assert(u->load_state == UNIT_STUB);
 135
 136         s->timeout_start_usec = u->manager->default_timeout_start_usec;
 137         s->timeout_stop_usec = u->manager->default_timeout_stop_usec;
 138         s->restart_usec = u->manager->default_restart_usec;
 139         s->type = _SERVICE_TYPE_INVALID;
 140
 141 #ifdef HAVE_SYSV_COMPAT
 142         s->sysv_start_priority = -1;
 143         s->sysv_start_priority_from_rcnd = -1;
 144 #endif
 145         s->socket_fd = -1;
 146         s->guess_main_pid = true;
 147
 148         RATELIMIT_INIT(s->start_limit, u->manager->default_start_limit_interval, u->manager->default_start_limit_burst);
 149
 150         s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
 151 }
 152
 153 static void service_unwatch_control_pid(Service *s) {
 154         assert(s);
 155
 156         if (s->control_pid <= 0)
 157                 return;
 158
 159         unit_unwatch_pid(UNIT(s), s->control_pid);
 160         s->control_pid = 0;
 161 }
 162
 163 static void service_unwatch_main_pid(Service *s) {
 164         assert(s);
 165
 166         if (s->main_pid <= 0)
 167                 return;
 168
 169         unit_unwatch_pid(UNIT(s), s->main_pid);
 170         s->main_pid = 0;
 171 }
 172
 173 static void service_unwatch_pid_file(Service *s) {
 174         if (!s->pid_file_pathspec)
 175                 return;
 176
 177         log_debug_unit(UNIT(s)->id, "Stopping watch for %s's PID file %s",
 178                        UNIT(s)->id, s->pid_file_pathspec->path);
 179         path_spec_unwatch(s->pid_file_pathspec);
 180         path_spec_done(s->pid_file_pathspec);
 181         free(s->pid_file_pathspec);
 182         s->pid_file_pathspec = NULL;
 183 }
 184
 185 static int service_set_main_pid(Service *s, pid_t pid) {
 186         pid_t ppid;
 187
 188         assert(s);
 189
 190         if (pid <= 1)
 191                 return -EINVAL;
 192
 193         if (pid == getpid())
 194                 return -EINVAL;
 195
 196         if (s->main_pid == pid && s->main_pid_known)
 197                 return 0;
 198
 199         if (s->main_pid != pid) {
 200                 service_unwatch_main_pid(s);
 201                 exec_status_start(&s->main_exec_status, pid);
 202         }
 203
 204         s->main_pid = pid;
 205         s->main_pid_known = true;
 206
 207         if (get_parent_of_pid(pid, &ppid) >= 0 && ppid != getpid()) {
 208                 log_warning_unit(UNIT(s)->id,
 209                                  "%s: Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.",
 210                                  UNIT(s)->id, pid);
 211
 212                 s->main_pid_alien = true;
 213         } else
 214                 s->main_pid_alien = false;
 215
 216         return 0;
 217 }
 218
 219 static void service_close_socket_fd(Service *s) {
 220         assert(s);
 221
 222         if (s->socket_fd < 0)
 223                 return;
 224
 225         s->socket_fd = safe_close(s->socket_fd);
 226 }
 227
 228 static void service_connection_unref(Service *s) {
 229         assert(s);
 230
 231         if (!UNIT_ISSET(s->accept_socket))
 232                 return;
 233
 234         socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket)));
 235         unit_ref_unset(&s->accept_socket);
 236 }
 237
 238 static void service_stop_watchdog(Service *s) {
 239         assert(s);
 240
 241         s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source);
 242         s->watchdog_timestamp = DUAL_TIMESTAMP_NULL;
 243 }
 244
 245 static void service_start_watchdog(Service *s) {
 246         int r;
 247
 248         assert(s);
 249
 250         if (s->watchdog_usec <= 0)
 251                 return;
 252
 253         if (s->watchdog_event_source) {
 254                 r = sd_event_source_set_time(s->watchdog_event_source, s->watchdog_timestamp.monotonic + s->watchdog_usec);
 255                 if (r < 0) {
 256                         log_warning_unit(UNIT(s)->id, "%s failed to reset watchdog timer: %s", UNIT(s)->id, strerror(-r));
 257                         return;
 258                 }
 259
 260                 r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT);
 261         } else {
 262                 r = sd_event_add_time(
 263                                 UNIT(s)->manager->event,
 264                                 &s->watchdog_event_source,
 265                                 CLOCK_MONOTONIC,
 266                                 s->watchdog_timestamp.monotonic + s->watchdog_usec, 0,
 267                                 service_dispatch_watchdog, s);
 268                 if (r < 0) {
 269                         log_warning_unit(UNIT(s)->id, "%s failed to add watchdog timer: %s", UNIT(s)->id, strerror(-r));
 270                         return;
 271                 }
 272
 273                 /* Let's process everything else which might be a sign
 274                  * of living before we consider a service died. */
 275                 r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE);
 276         }
 277
 278         if (r < 0)
 279                 log_warning_unit(UNIT(s)->id, "%s failed to install watchdog timer: %s", UNIT(s)->id, strerror(-r));
 280 }
 281
 282 static void service_reset_watchdog(Service *s) {
 283         assert(s);
 284
 285         dual_timestamp_get(&s->watchdog_timestamp);
 286         service_start_watchdog(s);
 287 }
 288
 289 static void service_done(Unit *u) {
 290         Service *s = SERVICE(u);
 291
 292         assert(s);
 293
 294         free(s->pid_file);
 295         s->pid_file = NULL;
 296
 297 #ifdef HAVE_SYSV_COMPAT
 298         free(s->sysv_runlevels);
 299         s->sysv_runlevels = NULL;
 300 #endif
 301
 302         free(s->status_text);
 303         s->status_text = NULL;
 304
 305         free(s->reboot_arg);
 306         s->reboot_arg = NULL;
 307
 308         s->exec_runtime = exec_runtime_unref(s->exec_runtime);
 309         exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
 310         s->control_command = NULL;
 311         s->main_command = NULL;
 312
 313         set_free(s->restart_ignore_status.code);
 314         s->restart_ignore_status.code = NULL;
 315         set_free(s->restart_ignore_status.signal);
 316         s->restart_ignore_status.signal = NULL;
 317
 318         set_free(s->success_status.code);
 319         s->success_status.code = NULL;
 320         set_free(s->success_status.signal);
 321         s->success_status.signal = NULL;
 322
 323         /* This will leak a process, but at least no memory or any of
 324          * our resources */
 325         service_unwatch_main_pid(s);
 326         service_unwatch_control_pid(s);
 327         service_unwatch_pid_file(s);
 328
 329         if (s->bus_name)  {
 330                 unit_unwatch_bus_name(u, s->bus_name);
 331                 free(s->bus_name);
 332                 s->bus_name = NULL;
 333         }
 334
 335         service_close_socket_fd(s);
 336         service_connection_unref(s);
 337
 338         unit_ref_unset(&s->accept_socket);
 339
 340         service_stop_watchdog(s);
 341
 342         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
 343 }
 344
 345 static int service_arm_timer(Service *s, usec_t usec) {
 346         int r;
 347
 348         assert(s);
 349
 350         if (s->timer_event_source) {
 351                 r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + usec);
 352                 if (r < 0)
 353                         return r;
 354
 355                 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
 356         }
 357
 358         return sd_event_add_time(
 359                         UNIT(s)->manager->event,
 360                         &s->timer_event_source,
 361                         CLOCK_MONOTONIC,
 362                         now(CLOCK_MONOTONIC) + usec, 0,
 363                         service_dispatch_timer, s);
 364 }
 365
 366 #ifdef HAVE_SYSV_COMPAT
 367 static char *sysv_translate_name(const char *name) {
 368         char *r;
 369
 370         r = new(char, strlen(name) + strlen(".service") + 1);
 371         if (!r)
 372                 return NULL;
 373
 374         if (endswith(name, ".sh"))
 375                 /* Drop .sh suffix */
 376                 strcpy(stpcpy(r, name) - 3, ".service");
 377         else
 378                 /* Normal init script name */
 379                 strcpy(stpcpy(r, name), ".service");
 380
 381         return r;
 382 }
 383
 384 static int sysv_translate_facility(const char *name, const char *filename, char **_r) {
 385
 386         /* We silently ignore the $ prefix here. According to the LSB
 387          * spec it simply indicates whether something is a
 388          * standardized name or a distribution-specific one. Since we
 389          * just follow what already exists and do not introduce new
 390          * uses or names we don't care who introduced a new name. */
 391
 392         static const char * const table[] = {
 393                 /* LSB defined facilities */
 394                 "local_fs",             NULL,
 395                 "network",              SPECIAL_NETWORK_TARGET,
 396                 "named",                SPECIAL_NSS_LOOKUP_TARGET,
 397                 "portmap",              SPECIAL_RPCBIND_TARGET,
 398                 "remote_fs",            SPECIAL_REMOTE_FS_TARGET,
 399                 "syslog",               NULL,
 400                 "time",                 SPECIAL_TIME_SYNC_TARGET,
 401         };
 402
 403         unsigned i;
 404         char *r;
 405         const char *n;
 406
 407         assert(name);
 408         assert(_r);
 409
 410         n = *name == '$' ? name + 1 : name;
 411
 412         for (i = 0; i < ELEMENTSOF(table); i += 2) {
 413
 414                 if (!streq(table[i], n))
 415                         continue;
 416
 417                 if (!table[i+1])
 418                         return 0;
 419
 420                 r = strdup(table[i+1]);
 421                 if (!r)
 422                         return log_oom();
 423
 424                 goto finish;
 425         }
 426
 427         /* If we don't know this name, fallback heuristics to figure
 428          * out whether something is a target or a service alias. */
 429
 430         if (*name == '$') {
 431                 if (!unit_prefix_is_valid(n))
 432                         return -EINVAL;
 433
 434                 /* Facilities starting with $ are most likely targets */
 435                 r = unit_name_build(n, NULL, ".target");
 436         } else if (filename && streq(name, filename))
 437                 /* Names equaling the file name of the services are redundant */
 438                 return 0;
 439         else
 440                 /* Everything else we assume to be normal service names */
 441                 r = sysv_translate_name(n);
 442
 443         if (!r)
 444                 return -ENOMEM;
 445
 446 finish:
 447         *_r = r;
 448
 449         return 1;
 450 }
 451
 452 static int sysv_fix_order(Service *s) {
 453         Unit *other;
 454         int r;
 455
 456         assert(s);
 457
 458         if (s->sysv_start_priority < 0)
 459                 return 0;
 460
 461         /* For each pair of services where at least one lacks a LSB
 462          * header, we use the start priority value to order things. */
 463
 464         LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_SERVICE]) {
 465                 Service *t;
 466                 UnitDependency d;
 467                 bool special_s, special_t;
 468
 469                 t = SERVICE(other);
 470
 471                 if (s == t)
 472                         continue;
 473
 474                 if (UNIT(t)->load_state != UNIT_LOADED)
 475                         continue;
 476
 477                 if (t->sysv_start_priority < 0)
 478                         continue;
 479
 480                 /* If both units have modern headers we don't care
 481                  * about the priorities */
 482                 if ((UNIT(s)->fragment_path || s->sysv_has_lsb) &&
 483                     (UNIT(t)->fragment_path || t->sysv_has_lsb))
 484                         continue;
 485
 486                 special_s = s->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, s->sysv_runlevels);
 487                 special_t = t->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, t->sysv_runlevels);
 488
 489                 if (special_t && !special_s)
 490                         d = UNIT_AFTER;
 491                 else if (special_s && !special_t)
 492                         d = UNIT_BEFORE;
 493                 else if (t->sysv_start_priority < s->sysv_start_priority)
 494                         d = UNIT_AFTER;
 495                 else if (t->sysv_start_priority > s->sysv_start_priority)
 496                         d = UNIT_BEFORE;
 497                 else
 498                         continue;
 499
 500                 /* FIXME: Maybe we should compare the name here lexicographically? */
 501
 502                 if ((r = unit_add_dependency(UNIT(s), d, UNIT(t), true)) < 0)
 503                         return r;
 504         }
 505
 506         return 0;
 507 }
 508
 509 static ExecCommand *exec_command_new(const char *path, const char *arg1) {
 510         ExecCommand *c;
 511
 512         if (!(c = new0(ExecCommand, 1)))
 513                 return NULL;
 514
 515         if (!(c->path = strdup(path))) {
 516                 free(c);
 517                 return NULL;
 518         }
 519
 520         if (!(c->argv = strv_new(path, arg1, NULL))) {
 521                 free(c->path);
 522                 free(c);
 523                 return NULL;
 524         }
 525
 526         return c;
 527 }
 528
 529 static int sysv_exec_commands(Service *s, const bool supports_reload) {
 530         ExecCommand *c;
 531
 532         assert(s);
 533         assert(s->is_sysv);
 534         assert(UNIT(s)->source_path);
 535
 536         c = exec_command_new(UNIT(s)->source_path, "start");
 537         if (!c)
 538                 return -ENOMEM;
 539         exec_command_append_list(s->exec_command+SERVICE_EXEC_START, c);
 540
 541         c = exec_command_new(UNIT(s)->source_path, "stop");
 542         if (!c)
 543                 return -ENOMEM;
 544         exec_command_append_list(s->exec_command+SERVICE_EXEC_STOP, c);
 545
 546         if (supports_reload) {
 547                 c = exec_command_new(UNIT(s)->source_path, "reload");
 548                 if (!c)
 549                         return -ENOMEM;
 550                 exec_command_append_list(s->exec_command+SERVICE_EXEC_RELOAD, c);
 551         }
 552
 553         return 0;
 554 }
 555
 556 static bool usage_contains_reload(const char *line) {
 557         return (strcasestr(line, "{reload|") ||
 558                 strcasestr(line, "{reload}") ||
 559                 strcasestr(line, "{reload\"") ||
 560                 strcasestr(line, "|reload|") ||
 561                 strcasestr(line, "|reload}") ||
 562                 strcasestr(line, "|reload\""));
 563 }
 564
 565 static int service_load_sysv_path(Service *s, const char *path) {
 566         FILE *f;
 567         Unit *u;
 568         unsigned line = 0;
 569         int r;
 570         enum {
 571                 NORMAL,
 572                 DESCRIPTION,
 573                 LSB,
 574                 LSB_DESCRIPTION,
 575                 USAGE_CONTINUATION
 576         } state = NORMAL;
 577         char *short_description = NULL, *long_description = NULL, *chkconfig_description = NULL, *description;
 578         struct stat st;
 579         bool supports_reload = false;
 580
 581         assert(s);
 582         assert(path);
 583
 584         u = UNIT(s);
 585
 586         f = fopen(path, "re");
 587         if (!f) {
 588                 r = errno == ENOENT ? 0 : -errno;
 589                 goto finish;
 590         }
 591
 592         if (fstat(fileno(f), &st) < 0) {
 593                 r = -errno;
 594                 goto finish;
 595         }
 596
 597         free(u->source_path);
 598         u->source_path = strdup(path);
 599         if (!u->source_path) {
 600                 r = -ENOMEM;
 601                 goto finish;
 602         }
 603         u->source_mtime = timespec_load(&st.st_mtim);
 604
 605         if (null_or_empty(&st)) {
 606                 u->load_state = UNIT_MASKED;
 607                 r = 0;
 608                 goto finish;
 609         }
 610
 611         s->is_sysv = true;
 612
 613         while (!feof(f)) {
 614                 char l[LINE_MAX], *t;
 615
 616                 if (!fgets(l, sizeof(l), f)) {
 617                         if (feof(f))
 618                                 break;
 619
 620                         r = -errno;
 621                         log_error_unit(u->id,
 622                                        "Failed to read configuration file '%s': %s",
 623                                        path, strerror(-r));
 624                         goto finish;
 625                 }
 626
 627                 line++;
 628
 629                 t = strstrip(l);
 630                 if (*t != '#') {
 631                         /* Try to figure out whether this init script supports
 632                          * the reload operation. This heuristic looks for
 633                          * "Usage" lines which include the reload option. */
 634                         if ( state == USAGE_CONTINUATION ||
 635                             (state == NORMAL && strcasestr(t, "usage"))) {
 636                                 if (usage_contains_reload(t)) {
 637                                         supports_reload = true;
 638                                         state = NORMAL;
 639                                 } else if (t[strlen(t)-1] == '\\')
 640                                         state = USAGE_CONTINUATION;
 641                                 else
 642                                         state = NORMAL;
 643                         }
 644
 645                         continue;
 646                 }
 647
 648                 if (state == NORMAL && streq(t, "### BEGIN INIT INFO")) {
 649                         state = LSB;
 650                         s->sysv_has_lsb = true;
 651                         continue;
 652                 }
 653
 654                 if ((state == LSB_DESCRIPTION || state == LSB) && streq(t, "### END INIT INFO")) {
 655                         state = NORMAL;
 656                         continue;
 657                 }
 658
 659                 t++;
 660                 t += strspn(t, WHITESPACE);
 661
 662                 if (state == NORMAL) {
 663
 664                         /* Try to parse Red Hat style chkconfig headers */
 665
 666                         if (startswith_no_case(t, "chkconfig:")) {
 667                                 int start_priority;
 668                                 char runlevels[16], *k;
 669
 670                                 state = NORMAL;
 671
 672                                 if (sscanf(t+10, "%15s %i %*i", runlevels, &start_priority) != 2) {
 673                                         log_warning_unit(u->id, "[%s:%u] Failed to parse chkconfig line. Ignoring.", path, line);
 674                                         continue;
 675                                 }
 676
 677                                 /* A start priority gathered from the
 678                                  * symlink farms is preferred over the
 679                                  * data from the LSB header. */
 680                                 if (start_priority < 0 || start_priority > 99)
 681                                         log_warning_unit(u->id, "[%s:%u] Start priority out of range. Ignoring.", path, line);
 682                                 else
 683                                         log_debug_unit(u->id, "[%s:%u] Ignoring start priority set in the chkconfig file.", path, line);
 684
 685                                 char_array_0(runlevels);
 686                                 k = delete_chars(runlevels, WHITESPACE "-");
 687                                 if (k[0]) {
 688                                         char *d;
 689
 690                                         d = strdup(k);
 691                                         if (!d) {
 692                                                 r = -ENOMEM;
 693                                                 goto finish;
 694                                         }
 695
 696                                         free(s->sysv_runlevels);
 697                                         s->sysv_runlevels = d;
 698                                 }
 699
 700                         } else if (startswith_no_case(t, "description:")) {
 701
 702                                 size_t k = strlen(t);
 703                                 char *d;
 704                                 const char *j;
 705
 706                                 if (t[k-1] == '\\') {
 707                                         state = DESCRIPTION;
 708                                         t[k-1] = 0;
 709                                 }
 710
 711                                 if ((j = strstrip(t+12)) && *j) {
 712                                         if (!(d = strdup(j))) {
 713                                                 r = -ENOMEM;
 714                                                 goto finish;
 715                                         }
 716                                 } else
 717                                         d = NULL;
 718
 719                                 free(chkconfig_description);
 720                                 chkconfig_description = d;
 721
 722                         } else if (startswith_no_case(t, "pidfile:")) {
 723
 724                                 char *fn;
 725
 726                                 state = NORMAL;
 727
 728                                 fn = strstrip(t+8);
 729                                 if (!path_is_absolute(fn)) {
 730                                         log_warning_unit(u->id,
 731                                                          "[%s:%u] PID file not absolute. Ignoring.",
 732                                                          path, line);
 733                                         continue;
 734                                 }
 735
 736                                 if (!(fn = strdup(fn))) {
 737                                         r = -ENOMEM;
 738                                         goto finish;
 739                                 }
 740
 741                                 free(s->pid_file);
 742                                 s->pid_file = fn;
 743                         }
 744
 745                 } else if (state == DESCRIPTION) {
 746
 747                         /* Try to parse Red Hat style description
 748                          * continuation */
 749
 750                         size_t k = strlen(t);
 751                         char *j;
 752
 753                         if (t[k-1] == '\\')
 754                                 t[k-1] = 0;
 755                         else
 756                                 state = NORMAL;
 757
 758                         if ((j = strstrip(t)) && *j) {
 759                                 char *d = NULL;
 760
 761                                 if (chkconfig_description)
 762                                         d = strjoin(chkconfig_description, " ", j, NULL);
 763                                 else
 764                                         d = strdup(j);
 765
 766                                 if (!d) {
 767                                         r = -ENOMEM;
 768                                         goto finish;
 769                                 }
 770
 771                                 free(chkconfig_description);
 772                                 chkconfig_description = d;
 773                         }
 774
 775                 } else if (state == LSB || state == LSB_DESCRIPTION) {
 776
 777                         if (startswith_no_case(t, "Provides:")) {
 778                                 char *i, *w;
 779                                 size_t z;
 780
 781                                 state = LSB;
 782
 783                                 FOREACH_WORD_QUOTED(w, z, t+9, i) {
 784                                         char *n, *m;
 785
 786                                         if (!(n = strndup(w, z))) {
 787                                                 r = -ENOMEM;
 788                                                 goto finish;
 789                                         }
 790
 791                                         r = sysv_translate_facility(n, basename(path), &m);
 792                                         free(n);
 793
 794                                         if (r < 0)
 795                                                 goto finish;
 796
 797                                         if (r == 0)
 798                                                 continue;
 799
 800                                         if (unit_name_to_type(m) == UNIT_SERVICE)
 801                                                 r = unit_merge_by_name(u, m);
 802                                         else
 803                                                 /* NB: SysV targets
 804                                                  * which are provided
 805                                                  * by a service are
 806                                                  * pulled in by the
 807                                                  * services, as an
 808                                                  * indication that the
 809                                                  * generic service is
 810                                                  * now available. This
 811                                                  * is strictly
 812                                                  * one-way. The
 813                                                  * targets do NOT pull
 814                                                  * in the SysV
 815                                                  * services! */
 816                                                 r = unit_add_two_dependencies_by_name(u, UNIT_BEFORE, UNIT_WANTS, m, NULL, true);
 817
 818                                         if (r < 0)
 819                                                 log_error_unit(u->id,
 820                                                                "[%s:%u] Failed to add LSB Provides name %s, ignoring: %s",
 821                                                                path, line, m, strerror(-r));
 822
 823                                         free(m);
 824                                 }
 825
 826                         } else if (startswith_no_case(t, "Required-Start:") ||
 827                                    startswith_no_case(t, "Should-Start:") ||
 828                                    startswith_no_case(t, "X-Start-Before:") ||
 829                                    startswith_no_case(t, "X-Start-After:")) {
 830                                 char *i, *w;
 831                                 size_t z;
 832
 833                                 state = LSB;
 834
 835                                 FOREACH_WORD_QUOTED(w, z, strchr(t, ':')+1, i) {
 836                                         char *n, *m;
 837
 838                                         if (!(n = strndup(w, z))) {
 839                                                 r = -ENOMEM;
 840                                                 goto finish;
 841                                         }
 842
 843                                         r = sysv_translate_facility(n, basename(path), &m);
 844                                         if (r < 0) {
 845                                                 log_error_unit(u->id,
 846                                                                "[%s:%u] Failed to translate LSB dependency %s, ignoring: %s",
 847                                                                path, line, n, strerror(-r));
 848                                                 free(n);
 849                                                 continue;
 850                                         }
 851
 852                                         free(n);
 853
 854                                         if (r == 0)
 855                                                 continue;
 856
 857                                         r = unit_add_dependency_by_name(u, startswith_no_case(t, "X-Start-Before:") ? UNIT_BEFORE : UNIT_AFTER, m, NULL, true);
 858
 859                                         if (r < 0)
 860                                                 log_error_unit(u->id, "[%s:%u] Failed to add dependency on %s, ignoring: %s",
 861                                                                path, line, m, strerror(-r));
 862
 863                                         free(m);
 864                                 }
 865                         } else if (startswith_no_case(t, "Default-Start:")) {
 866                                 char *k, *d;
 867
 868                                 state = LSB;
 869
 870                                 k = delete_chars(t+14, WHITESPACE "-");
 871
 872                                 if (k[0] != 0) {
 873                                         if (!(d = strdup(k))) {
 874                                                 r = -ENOMEM;
 875                                                 goto finish;
 876                                         }
 877
 878                                         free(s->sysv_runlevels);
 879                                         s->sysv_runlevels = d;
 880                                 }
 881
 882                         } else if (startswith_no_case(t, "Description:")) {
 883                                 char *d, *j;
 884
 885                                 state = LSB_DESCRIPTION;
 886
 887                                 if ((j = strstrip(t+12)) && *j) {
 888                                         if (!(d = strdup(j))) {
 889                                                 r = -ENOMEM;
 890                                                 goto finish;
 891                                         }
 892                                 } else
 893                                         d = NULL;
 894
 895                                 free(long_description);
 896                                 long_description = d;
 897
 898                         } else if (startswith_no_case(t, "Short-Description:")) {
 899                                 char *d, *j;
 900
 901                                 state = LSB;
 902
 903                                 if ((j = strstrip(t+18)) && *j) {
 904                                         if (!(d = strdup(j))) {
 905                                                 r = -ENOMEM;
 906                                                 goto finish;
 907                                         }
 908                                 } else
 909                                         d = NULL;
 910
 911                                 free(short_description);
 912                                 short_description = d;
 913
 914                         } else if (state == LSB_DESCRIPTION) {
 915
 916                                 if (startswith(l, "#\t") || startswith(l, "#  ")) {
 917                                         char *j;
 918
 919                                         if ((j = strstrip(t)) && *j) {
 920                                                 char *d = NULL;
 921
 922                                                 if (long_description)
 923                                                         d = strjoin(long_description, " ", t, NULL);
 924                                                 else
 925                                                         d = strdup(j);
 926
 927                                                 if (!d) {
 928                                                         r = -ENOMEM;
 929                                                         goto finish;
 930                                                 }
 931
 932                                                 free(long_description);
 933                                                 long_description = d;
 934                                         }
 935
 936                                 } else
 937                                         state = LSB;
 938                         }
 939                 }
 940         }
 941
 942         if ((r = sysv_exec_commands(s, supports_reload)) < 0)
 943                 goto finish;
 944
 945         if (s->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, s->sysv_runlevels)) {
 946                 /* If there a runlevels configured for this service
 947                  * but none of the standard ones, then we assume this
 948                  * is some special kind of service (which might be
 949                  * needed for early boot) and don't create any links
 950                  * to it. */
 951
 952                 UNIT(s)->default_dependencies = false;
 953
 954                 /* Don't timeout special services during boot (like fsck) */
 955                 s->timeout_start_usec = 0;
 956                 s->timeout_stop_usec = 0;
 957         } else {
 958                 s->timeout_start_usec = DEFAULT_SYSV_TIMEOUT_USEC;
 959                 s->timeout_stop_usec = DEFAULT_SYSV_TIMEOUT_USEC;
 960         }
 961
 962         /* Special setting for all SysV services */
 963         s->type = SERVICE_FORKING;
 964         s->remain_after_exit = !s->pid_file;
 965         s->guess_main_pid = false;
 966         s->restart = SERVICE_RESTART_NO;
 967         s->exec_context.ignore_sigpipe = false;
 968         s->kill_context.kill_mode = KILL_PROCESS;
 969
 970         /* We use the long description only if
 971          * no short description is set. */
 972
 973         if (short_description)
 974                 description = short_description;
 975         else if (chkconfig_description)
 976                 description = chkconfig_description;
 977         else if (long_description)
 978                 description = long_description;
 979         else
 980                 description = NULL;
 981
 982         if (description) {
 983                 char *d;
 984
 985                 if (!(d = strappend(s->sysv_has_lsb ? "LSB: " : "SYSV: ", description))) {
 986                         r = -ENOMEM;
 987                         goto finish;
 988                 }
 989
 990                 u->description = d;
 991         }
 992
 993         /* Initialize the start priority from what has been set in the
 994          * /etc/rcN.d/ hierarchies if we load the unit file as SysV
 995          * init script. */
 996         if (s->sysv_start_priority_from_rcnd >= 0)
 997                 s->sysv_start_priority = s->sysv_start_priority_from_rcnd;
 998
 999         u->load_state = UNIT_LOADED;
1000         r = 0;
1001
1002 finish:
1003
1004         if (f)
1005                 fclose(f);
1006
1007         free(short_description);
1008         free(long_description);
1009         free(chkconfig_description);
1010
1011         return r;
1012 }
1013
1014 static int service_load_sysv_name(Service *s, const char *name) {
1015         char **p;
1016
1017         assert(s);
1018         assert(name);
1019
1020         /* For SysV services we strip the *.sh suffixes. */
1021         if (endswith(name, ".sh.service"))
1022                 return -ENOENT;
1023
1024         STRV_FOREACH(p, UNIT(s)->manager->lookup_paths.sysvinit_path) {
1025                 char *path;
1026                 int r;
1027
1028                 path = strjoin(*p, "/", name, NULL);
1029                 if (!path)
1030                         return -ENOMEM;
1031
1032                 assert(endswith(path, ".service"));
1033                 path[strlen(path)-8] = 0;
1034
1035                 r = service_load_sysv_path(s, path);
1036
1037                 if (r >= 0 && UNIT(s)->load_state == UNIT_STUB) {
1038                         /* Try *.sh source'able init scripts */
1039                         strcat(path, ".sh");
1040                         r = service_load_sysv_path(s, path);
1041                 }
1042                 free(path);
1043
1044                 if (r < 0)
1045                         return r;
1046
1047                 if (UNIT(s)->load_state != UNIT_STUB)
1048                         break;
1049         }
1050
1051         return 0;
1052 }
1053
1054 static int service_load_sysv(Service *s) {
1055         const char *t;
1056         Iterator i;
1057         int r;
1058
1059         assert(s);
1060
1061         /* Load service data from SysV init scripts, preferably with
1062          * LSB headers ... */
1063
1064         if (strv_isempty(UNIT(s)->manager->lookup_paths.sysvinit_path))
1065                 return 0;
1066
1067         if ((t = UNIT(s)->id))
1068                 if ((r = service_load_sysv_name(s, t)) < 0)
1069                         return r;
1070
1071         if (UNIT(s)->load_state == UNIT_STUB)
1072                 SET_FOREACH(t, UNIT(s)->names, i) {
1073                         if (t == UNIT(s)->id)
1074                                 continue;
1075
1076                         if ((r = service_load_sysv_name(s, t)) < 0)
1077                                 return r;
1078
1079                         if (UNIT(s)->load_state != UNIT_STUB)
1080                                 break;
1081                 }
1082
1083         return 0;
1084 }
1085 #endif
1086
1087 static int service_verify(Service *s) {
1088         assert(s);
1089
1090         if (UNIT(s)->load_state != UNIT_LOADED)
1091                 return 0;
1092
1093         if (!s->exec_command[SERVICE_EXEC_START]) {
1094                 log_error_unit(UNIT(s)->id, "%s lacks ExecStart setting. Refusing.", UNIT(s)->id);
1095                 return -EINVAL;
1096         }
1097
1098         if (s->type != SERVICE_ONESHOT &&
1099             s->exec_command[SERVICE_EXEC_START]->command_next) {
1100                 log_error_unit(UNIT(s)->id, "%s has more than one ExecStart setting, which is only allowed for Type=oneshot services. Refusing.", UNIT(s)->id);
1101                 return -EINVAL;
1102         }
1103
1104         if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) {
1105                 log_error_unit(UNIT(s)->id, "%s has Restart setting other than no, which isn't allowed for Type=oneshot services. Refusing.", UNIT(s)->id);
1106                 return -EINVAL;
1107         }
1108
1109         if (s->type == SERVICE_DBUS && !s->bus_name) {
1110                 log_error_unit(UNIT(s)->id, "%s is of type D-Bus but no D-Bus service name has been specified. Refusing.", UNIT(s)->id);
1111                 return -EINVAL;
1112         }
1113
1114         if (s->bus_name && s->type != SERVICE_DBUS)
1115                 log_warning_unit(UNIT(s)->id, "%s has a D-Bus service name specified, but is not of type dbus. Ignoring.", UNIT(s)->id);
1116
1117         if (s->exec_context.pam_name && !(s->kill_context.kill_mode == KILL_CONTROL_GROUP || s->kill_context.kill_mode == KILL_MIXED)) {
1118                 log_error_unit(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing.", UNIT(s)->id);
1119                 return -EINVAL;
1120         }
1121
1122         return 0;
1123 }
1124
1125 static int service_add_default_dependencies(Service *s) {
1126         int r;
1127
1128         assert(s);
1129
1130         /* Add a number of automatic dependencies useful for the
1131          * majority of services. */
1132
1133         /* First, pull in base system */
1134         r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES,
1135                                               SPECIAL_BASIC_TARGET, NULL, true);
1136         if (r < 0)
1137                 return r;
1138
1139         /* Second, activate normal shutdown */
1140         r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS,
1141                                               SPECIAL_SHUTDOWN_TARGET, NULL, true);
1142         return r;
1143 }
1144
1145 static void service_fix_output(Service *s) {
1146         assert(s);
1147
1148         /* If nothing has been explicitly configured, patch default
1149          * output in. If input is socket/tty we avoid this however,
1150          * since in that case we want output to default to the same
1151          * place as we read input from. */
1152
1153         if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT &&
1154             s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
1155             s->exec_context.std_input == EXEC_INPUT_NULL)
1156                 s->exec_context.std_error = UNIT(s)->manager->default_std_error;
1157
1158         if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
1159             s->exec_context.std_input == EXEC_INPUT_NULL)
1160                 s->exec_context.std_output = UNIT(s)->manager->default_std_output;
1161 }
1162
1163 static int service_load(Unit *u) {
1164         int r;
1165         Service *s = SERVICE(u);
1166
1167         assert(s);
1168
1169         /* Load a .service file */
1170         r = unit_load_fragment(u);
1171         if (r < 0)
1172                 return r;
1173
1174 #ifdef HAVE_SYSV_COMPAT
1175         /* Load a classic init script as a fallback, if we couldn't find anything */
1176         if (u->load_state == UNIT_STUB) {
1177                 r = service_load_sysv(s);
1178                 if (r < 0)
1179                         return r;
1180         }
1181 #endif
1182
1183         /* Still nothing found? Then let's give up */
1184         if (u->load_state == UNIT_STUB)
1185                 return -ENOENT;
1186
1187         /* This is a new unit? Then let's add in some extras */
1188         if (u->load_state == UNIT_LOADED) {
1189
1190                 /* We were able to load something, then let's add in
1191                  * the dropin directories. */
1192                 r = unit_load_dropin(u);
1193                 if (r < 0)
1194                         return r;
1195
1196                 if (s->type == _SERVICE_TYPE_INVALID)
1197                         s->type = s->bus_name ? SERVICE_DBUS : SERVICE_SIMPLE;
1198
1199                 /* Oneshot services have disabled start timeout by default */
1200                 if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined)
1201                         s->timeout_start_usec = 0;
1202
1203                 service_fix_output(s);
1204
1205                 r = unit_patch_contexts(u);
1206                 if (r < 0)
1207                         return r;
1208
1209                 r = unit_add_exec_dependencies(u, &s->exec_context);
1210                 if (r < 0)
1211                         return r;
1212
1213                 r = unit_add_default_slice(u, &s->cgroup_context);
1214                 if (r < 0)
1215                         return r;
1216
1217 #ifdef HAVE_SYSV_COMPAT
1218                 r = sysv_fix_order(s);
1219                 if (r < 0)
1220                         return r;
1221 #endif
1222
1223                 if (s->type == SERVICE_NOTIFY && s->notify_access == NOTIFY_NONE)
1224                         s->notify_access = NOTIFY_MAIN;
1225
1226                 if (s->watchdog_usec > 0 && s->notify_access == NOTIFY_NONE)
1227                         s->notify_access = NOTIFY_MAIN;
1228
1229                 if (s->bus_name) {
1230                         r = unit_watch_bus_name(u, s->bus_name);
1231                         if (r < 0)
1232                                 return r;
1233                 }
1234
1235                 if (u->default_dependencies) {
1236                         r = service_add_default_dependencies(s);
1237                         if (r < 0)
1238                                 return r;
1239                 }
1240         }
1241
1242         return service_verify(s);
1243 }
1244
1245 static void service_dump(Unit *u, FILE *f, const char *prefix) {
1246
1247         ServiceExecCommand c;
1248         Service *s = SERVICE(u);
1249         const char *prefix2;
1250         _cleanup_free_ char *p2 = NULL;
1251
1252         assert(s);
1253
1254         p2 = strappend(prefix, "\t");
1255         prefix2 = p2 ? p2 : prefix;
1256
1257         fprintf(f,
1258                 "%sService State: %s\n"
1259                 "%sResult: %s\n"
1260                 "%sReload Result: %s\n"
1261                 "%sPermissionsStartOnly: %s\n"
1262                 "%sRootDirectoryStartOnly: %s\n"
1263                 "%sRemainAfterExit: %s\n"
1264                 "%sGuessMainPID: %s\n"
1265                 "%sType: %s\n"
1266                 "%sRestart: %s\n"
1267                 "%sNotifyAccess: %s\n",
1268                 prefix, service_state_to_string(s->state),
1269                 prefix, service_result_to_string(s->result),
1270                 prefix, service_result_to_string(s->reload_result),
1271                 prefix, yes_no(s->permissions_start_only),
1272                 prefix, yes_no(s->root_directory_start_only),
1273                 prefix, yes_no(s->remain_after_exit),
1274                 prefix, yes_no(s->guess_main_pid),
1275                 prefix, service_type_to_string(s->type),
1276                 prefix, service_restart_to_string(s->restart),
1277                 prefix, notify_access_to_string(s->notify_access));
1278
1279         if (s->control_pid > 0)
1280                 fprintf(f,
1281                         "%sControl PID: "PID_FMT"\n",
1282                         prefix, s->control_pid);
1283
1284         if (s->main_pid > 0)
1285                 fprintf(f,
1286                         "%sMain PID: "PID_FMT"\n"
1287                         "%sMain PID Known: %s\n"
1288                         "%sMain PID Alien: %s\n",
1289                         prefix, s->main_pid,
1290                         prefix, yes_no(s->main_pid_known),
1291                         prefix, yes_no(s->main_pid_alien));
1292
1293         if (s->pid_file)
1294                 fprintf(f,
1295                         "%sPIDFile: %s\n",
1296                         prefix, s->pid_file);
1297
1298         if (s->bus_name)
1299                 fprintf(f,
1300                         "%sBusName: %s\n"
1301                         "%sBus Name Good: %s\n",
1302                         prefix, s->bus_name,
1303                         prefix, yes_no(s->bus_name_good));
1304
1305         kill_context_dump(&s->kill_context, f, prefix);
1306         exec_context_dump(&s->exec_context, f, prefix);
1307
1308         for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) {
1309
1310                 if (!s->exec_command[c])
1311                         continue;
1312
1313                 fprintf(f, "%s-> %s:\n",
1314                         prefix, service_exec_command_to_string(c));
1315
1316                 exec_command_dump_list(s->exec_command[c], f, prefix2);
1317         }
1318
1319 #ifdef HAVE_SYSV_COMPAT
1320         if (s->is_sysv)
1321                 fprintf(f,
1322                         "%sSysV Init Script has LSB Header: %s\n"
1323                         "%sSysVEnabled: %s\n",
1324                         prefix, yes_no(s->sysv_has_lsb),
1325                         prefix, yes_no(s->sysv_enabled));
1326
1327         if (s->sysv_start_priority >= 0)
1328                 fprintf(f,
1329                         "%sSysVStartPriority: %i\n",
1330                         prefix, s->sysv_start_priority);
1331
1332         if (s->sysv_runlevels)
1333                 fprintf(f, "%sSysVRunLevels: %s\n",
1334                         prefix, s->sysv_runlevels);
1335 #endif
1336
1337         if (s->status_text)
1338                 fprintf(f, "%sStatus Text: %s\n",
1339                         prefix, s->status_text);
1340 }
1341
1342 static int service_load_pid_file(Service *s, bool may_warn) {
1343         _cleanup_free_ char *k = NULL;
1344         int r;
1345         pid_t pid;
1346
1347         assert(s);
1348
1349         if (!s->pid_file)
1350                 return -ENOENT;
1351
1352         r = read_one_line_file(s->pid_file, &k);
1353         if (r < 0) {
1354                 if (may_warn)
1355                         log_info_unit(UNIT(s)->id,
1356                                       "PID file %s not readable (yet?) after %s.",
1357                                       s->pid_file, service_state_to_string(s->state));
1358                 return r;
1359         }
1360
1361         r = parse_pid(k, &pid);
1362         if (r < 0) {
1363                 if (may_warn)
1364                         log_info_unit(UNIT(s)->id,
1365                                       "Failed to read PID from file %s: %s",
1366                                       s->pid_file, strerror(-r));
1367                 return r;
1368         }
1369
1370         if (!pid_is_alive(pid)) {
1371                 if (may_warn)
1372                         log_info_unit(UNIT(s)->id, "PID "PID_FMT" read from file %s does not exist or is a zombie.", pid, s->pid_file);
1373
1374                 return -ESRCH;
1375         }
1376
1377         if (s->main_pid_known) {
1378                 if (pid == s->main_pid)
1379                         return 0;
1380
1381                 log_debug_unit(UNIT(s)->id,
1382                                "Main PID changing: "PID_FMT" -> "PID_FMT,
1383                                s->main_pid, pid);
1384                 service_unwatch_main_pid(s);
1385                 s->main_pid_known = false;
1386         } else
1387                 log_debug_unit(UNIT(s)->id,
1388                                "Main PID loaded: "PID_FMT, pid);
1389
1390         r = service_set_main_pid(s, pid);
1391         if (r < 0)
1392                 return r;
1393
1394         r = unit_watch_pid(UNIT(s), pid);
1395         if (r < 0) {
1396                 /* FIXME: we need to do something here */
1397                 log_warning_unit(UNIT(s)->id,
1398                                  "Failed to watch PID "PID_FMT" from service %s",
1399                                  pid, UNIT(s)->id);
1400                 return r;
1401         }
1402
1403         return 0;
1404 }
1405
1406 static int service_search_main_pid(Service *s) {
1407         pid_t pid;
1408         int r;
1409
1410         assert(s);
1411
1412         /* If we know it anyway, don't ever fallback to unreliable
1413          * heuristics */
1414         if (s->main_pid_known)
1415                 return 0;
1416
1417         if (!s->guess_main_pid)
1418                 return 0;
1419
1420         assert(s->main_pid <= 0);
1421
1422         pid = unit_search_main_pid(UNIT(s));
1423         if (pid <= 0)
1424                 return -ENOENT;
1425
1426         log_debug_unit(UNIT(s)->id,
1427                        "Main PID guessed: "PID_FMT, pid);
1428         r = service_set_main_pid(s, pid);
1429         if (r < 0)
1430                 return r;
1431
1432         r = unit_watch_pid(UNIT(s), pid);
1433         if (r < 0)
1434                 /* FIXME: we need to do something here */
1435                 log_warning_unit(UNIT(s)->id,
1436                                  "Failed to watch PID "PID_FMT" from service %s",
1437                                  pid, UNIT(s)->id);
1438         return r;
1439 }
1440
1441 static void service_set_state(Service *s, ServiceState state) {
1442         ServiceState old_state;
1443         const UnitActiveState *table;
1444
1445         assert(s);
1446
1447         table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
1448
1449         old_state = s->state;
1450         s->state = state;
1451
1452         service_unwatch_pid_file(s);
1453
1454         if (!IN_SET(state,
1455                     SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1456                     SERVICE_RELOAD,
1457                     SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1458                     SERVICE_STOP_POST,
1459                     SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
1460                     SERVICE_AUTO_RESTART))
1461                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1462
1463         if (!IN_SET(state,
1464                     SERVICE_START, SERVICE_START_POST,
1465                     SERVICE_RUNNING, SERVICE_RELOAD,
1466                     SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1467                     SERVICE_STOP_POST,
1468                     SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1469                 service_unwatch_main_pid(s);
1470                 s->main_command = NULL;
1471         }
1472
1473         if (!IN_SET(state,
1474                     SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1475                     SERVICE_RELOAD,
1476                     SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1477                     SERVICE_STOP_POST,
1478                     SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1479                 service_unwatch_control_pid(s);
1480                 s->control_command = NULL;
1481                 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
1482         }
1483
1484         if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
1485                 unit_unwatch_all_pids(UNIT(s));
1486
1487         if (!IN_SET(state,
1488                     SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1489                     SERVICE_RUNNING, SERVICE_RELOAD,
1490                     SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1491                     SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) &&
1492             !(state == SERVICE_DEAD && UNIT(s)->job)) {
1493                 service_close_socket_fd(s);
1494                 service_connection_unref(s);
1495         }
1496
1497         if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1498                 service_stop_watchdog(s);
1499
1500         /* For the inactive states unit_notify() will trim the cgroup,
1501          * but for exit we have to do that ourselves... */
1502         if (state == SERVICE_EXITED && UNIT(s)->manager->n_reloading <= 0)
1503                 unit_destroy_cgroup(UNIT(s));
1504
1505         /* For remain_after_exit services, let's see if we can "release" the
1506          * hold on the console, since unit_notify() only does that in case of
1507          * change of state */
1508         if (state == SERVICE_EXITED && s->remain_after_exit &&
1509             UNIT(s)->manager->n_on_console > 0) {
1510                 ExecContext *ec = unit_get_exec_context(UNIT(s));
1511                 if (ec && exec_context_may_touch_console(ec)) {
1512                         Manager *m = UNIT(s)->manager;
1513
1514                         m->n_on_console --;
1515                         if (m->n_on_console == 0)
1516                                 /* unset no_console_output flag, since the console is free */
1517                                 m->no_console_output = false;
1518                 }
1519         }
1520
1521         if (old_state != state)
1522                 log_debug_unit(UNIT(s)->id, "%s changed %s -> %s", UNIT(s)->id, service_state_to_string(old_state), service_state_to_string(state));
1523
1524         unit_notify(UNIT(s), table[old_state], table[state], s->reload_result == SERVICE_SUCCESS);
1525         s->reload_result = SERVICE_SUCCESS;
1526 }
1527
1528 static int service_coldplug(Unit *u) {
1529         Service *s = SERVICE(u);
1530         int r;
1531
1532         assert(s);
1533         assert(s->state == SERVICE_DEAD);
1534
1535         if (s->deserialized_state != s->state) {
1536
1537                 if (IN_SET(s->deserialized_state,
1538                            SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1539                            SERVICE_RELOAD,
1540                            SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1541                            SERVICE_STOP_POST,
1542                            SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1543
1544                         usec_t k;
1545
1546                         k = IN_SET(s->deserialized_state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD) ? s->timeout_start_usec : s->timeout_stop_usec;
1547
1548                         /* For the start/stop timeouts 0 means off */
1549                         if (k > 0) {
1550                                 r = service_arm_timer(s, k);
1551                                 if (r < 0)
1552                                         return r;
1553                         }
1554                 }
1555
1556                 if (s->deserialized_state == SERVICE_AUTO_RESTART) {
1557
1558                         /* The restart timeouts 0 means immediately */
1559                         r = service_arm_timer(s, s->restart_usec);
1560                         if (r < 0)
1561                                 return r;
1562                 }
1563
1564                 if (pid_is_unwaited(s->main_pid) &&
1565                     ((s->deserialized_state == SERVICE_START && IN_SET(s->type, SERVICE_FORKING, SERVICE_DBUS, SERVICE_ONESHOT, SERVICE_NOTIFY)) ||
1566                      IN_SET(s->deserialized_state,
1567                             SERVICE_START, SERVICE_START_POST,
1568                             SERVICE_RUNNING, SERVICE_RELOAD,
1569                             SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1570                             SERVICE_STOP_POST,
1571                             SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) {
1572                         r = unit_watch_pid(UNIT(s), s->main_pid);
1573                         if (r < 0)
1574                                 return r;
1575                 }
1576
1577                 if (pid_is_unwaited(s->control_pid) &&
1578                     IN_SET(s->deserialized_state,
1579                            SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1580                            SERVICE_RELOAD,
1581                            SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1582                            SERVICE_STOP_POST,
1583                            SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1584                         r = unit_watch_pid(UNIT(s), s->control_pid);
1585                         if (r < 0)
1586                                 return r;
1587                 }
1588
1589                 if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
1590                         unit_watch_all_pids(UNIT(s));
1591
1592                 if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1593                         service_start_watchdog(s);
1594
1595                 service_set_state(s, s->deserialized_state);
1596         }
1597
1598         return 0;
1599 }
1600
1601 static int service_collect_fds(Service *s, int **fds, unsigned *n_fds) {
1602         Iterator i;
1603         int r;
1604         int *rfds = NULL;
1605         unsigned rn_fds = 0;
1606         Unit *u;
1607
1608         assert(s);
1609         assert(fds);
1610         assert(n_fds);
1611
1612         if (s->socket_fd >= 0)
1613                 return 0;
1614
1615         SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) {
1616                 int *cfds;
1617                 unsigned cn_fds;
1618                 Socket *sock;
1619
1620                 if (u->type != UNIT_SOCKET)
1621                         continue;
1622
1623                 sock = SOCKET(u);
1624
1625                 r = socket_collect_fds(sock, &cfds, &cn_fds);
1626                 if (r < 0)
1627                         goto fail;
1628
1629                 if (!cfds)
1630                         continue;
1631
1632                 if (!rfds) {
1633                         rfds = cfds;
1634                         rn_fds = cn_fds;
1635                 } else {
1636                         int *t;
1637
1638                         t = new(int, rn_fds+cn_fds);
1639                         if (!t) {
1640                                 free(cfds);
1641                                 r = -ENOMEM;
1642                                 goto fail;
1643                         }
1644
1645                         memcpy(t, rfds, rn_fds * sizeof(int));
1646                         memcpy(t+rn_fds, cfds, cn_fds * sizeof(int));
1647                         free(rfds);
1648                         free(cfds);
1649
1650                         rfds = t;
1651                         rn_fds = rn_fds+cn_fds;
1652                 }
1653         }
1654
1655         *fds = rfds;
1656         *n_fds = rn_fds;
1657
1658         return 0;
1659
1660 fail:
1661         free(rfds);
1662
1663         return r;
1664 }
1665
1666 static int service_spawn(
1667                 Service *s,
1668                 ExecCommand *c,
1669                 bool timeout,
1670                 bool pass_fds,
1671                 bool apply_permissions,
1672                 bool apply_chroot,
1673                 bool apply_tty_stdin,
1674                 bool set_notify_socket,
1675                 bool is_control,
1676                 pid_t *_pid) {
1677
1678         pid_t pid;
1679         int r;
1680         int *fds = NULL;
1681         _cleanup_free_ int *fdsbuf = NULL;
1682         unsigned n_fds = 0, n_env = 0;
1683         _cleanup_strv_free_ char
1684                 **argv = NULL, **final_env = NULL, **our_env = NULL;
1685         const char *path;
1686
1687         assert(s);
1688         assert(c);
1689         assert(_pid);
1690
1691         unit_realize_cgroup(UNIT(s));
1692
1693         r = unit_setup_exec_runtime(UNIT(s));
1694         if (r < 0)
1695                 goto fail;
1696
1697         if (pass_fds ||
1698             s->exec_context.std_input == EXEC_INPUT_SOCKET ||
1699             s->exec_context.std_output == EXEC_OUTPUT_SOCKET ||
1700             s->exec_context.std_error == EXEC_OUTPUT_SOCKET) {
1701
1702                 if (s->socket_fd >= 0) {
1703                         fds = &s->socket_fd;
1704                         n_fds = 1;
1705                 } else {
1706                         r = service_collect_fds(s, &fdsbuf, &n_fds);
1707                         if (r < 0)
1708                                 goto fail;
1709
1710                         fds = fdsbuf;
1711                 }
1712         }
1713
1714         if (timeout && s->timeout_start_usec > 0) {
1715                 r = service_arm_timer(s, s->timeout_start_usec);
1716                 if (r < 0)
1717                         goto fail;
1718         } else
1719                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1720
1721         r = unit_full_printf_strv(UNIT(s), c->argv, &argv);
1722         if (r < 0)
1723                 goto fail;
1724
1725         our_env = new0(char*, 4);
1726         if (!our_env) {
1727                 r = -ENOMEM;
1728                 goto fail;
1729         }
1730
1731         if (set_notify_socket)
1732                 if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0) {
1733                         r = -ENOMEM;
1734                         goto fail;
1735                 }
1736
1737         if (s->main_pid > 0)
1738                 if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0) {
1739                         r = -ENOMEM;
1740                         goto fail;
1741                 }
1742
1743         if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM)
1744                 if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid()) < 0) {
1745                         r = -ENOMEM;
1746                         goto fail;
1747                 }
1748
1749         final_env = strv_env_merge(2, UNIT(s)->manager->environment, our_env, NULL);
1750         if (!final_env) {
1751                 r = -ENOMEM;
1752                 goto fail;
1753         }
1754
1755         if (is_control && UNIT(s)->cgroup_path) {
1756                 path = strappenda(UNIT(s)->cgroup_path, "/control");
1757                 cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
1758         } else
1759                 path = UNIT(s)->cgroup_path;
1760
1761         r = exec_spawn(c,
1762                        argv,
1763                        &s->exec_context,
1764                        fds, n_fds,
1765                        final_env,
1766                        apply_permissions,
1767                        apply_chroot,
1768                        apply_tty_stdin,
1769                        UNIT(s)->manager->confirm_spawn,
1770                        UNIT(s)->manager->cgroup_supported,
1771                        path,
1772                        manager_get_runtime_prefix(UNIT(s)->manager),
1773                        UNIT(s)->id,
1774                        s->watchdog_usec,
1775                        s->type == SERVICE_IDLE ? UNIT(s)->manager->idle_pipe : NULL,
1776                        s->exec_runtime,
1777                        &pid);
1778         if (r < 0)
1779                 goto fail;
1780
1781         r = unit_watch_pid(UNIT(s), pid);
1782         if (r < 0)
1783                 /* FIXME: we need to do something here */
1784                 goto fail;
1785
1786         *_pid = pid;
1787
1788         return 0;
1789
1790 fail:
1791         if (timeout)
1792                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1793
1794         return r;
1795 }
1796
1797 static int main_pid_good(Service *s) {
1798         assert(s);
1799
1800         /* Returns 0 if the pid is dead, 1 if it is good, -1 if we
1801          * don't know */
1802
1803         /* If we know the pid file, then lets just check if it is
1804          * still valid */
1805         if (s->main_pid_known) {
1806
1807                 /* If it's an alien child let's check if it is still
1808                  * alive ... */
1809                 if (s->main_pid_alien && s->main_pid > 0)
1810                         return pid_is_alive(s->main_pid);
1811
1812                 /* .. otherwise assume we'll get a SIGCHLD for it,
1813                  * which we really should wait for to collect exit
1814                  * status and code */
1815                 return s->main_pid > 0;
1816         }
1817
1818         /* We don't know the pid */
1819         return -EAGAIN;
1820 }
1821
1822 _pure_ static int control_pid_good(Service *s) {
1823         assert(s);
1824
1825         return s->control_pid > 0;
1826 }
1827
1828 static int cgroup_good(Service *s) {
1829         int r;
1830
1831         assert(s);
1832
1833         if (!UNIT(s)->cgroup_path)
1834                 return 0;
1835
1836         r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path, true);
1837         if (r < 0)
1838                 return r;
1839
1840         return !r;
1841 }
1842
1843 static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) {
1844         int r;
1845         assert(s);
1846
1847         if (f != SERVICE_SUCCESS)
1848                 s->result = f;
1849
1850         service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD);
1851
1852         if (allow_restart &&
1853             !s->forbid_restart &&
1854             (s->restart == SERVICE_RESTART_ALWAYS ||
1855              (s->restart == SERVICE_RESTART_ON_SUCCESS && s->result == SERVICE_SUCCESS) ||
1856              (s->restart == SERVICE_RESTART_ON_FAILURE && s->result != SERVICE_SUCCESS) ||
1857              (s->restart == SERVICE_RESTART_ON_WATCHDOG && s->result == SERVICE_FAILURE_WATCHDOG) ||
1858              (s->restart == SERVICE_RESTART_ON_ABORT && (s->result == SERVICE_FAILURE_SIGNAL ||
1859                                                          s->result == SERVICE_FAILURE_CORE_DUMP))) &&
1860             (s->result != SERVICE_FAILURE_EXIT_CODE ||
1861              !set_contains(s->restart_ignore_status.code, INT_TO_PTR(s->main_exec_status.status))) &&
1862             (s->result != SERVICE_FAILURE_SIGNAL ||
1863              !set_contains(s->restart_ignore_status.signal, INT_TO_PTR(s->main_exec_status.status)))) {
1864
1865                 r = service_arm_timer(s, s->restart_usec);
1866                 if (r < 0)
1867                         goto fail;
1868
1869                 service_set_state(s, SERVICE_AUTO_RESTART);
1870         }
1871
1872         s->forbid_restart = false;
1873
1874         /* We want fresh tmpdirs in case service is started again immediately */
1875         exec_runtime_destroy(s->exec_runtime);
1876         s->exec_runtime = exec_runtime_unref(s->exec_runtime);
1877
1878         /* Also, remove the runtime directory in */
1879         exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
1880
1881         /* Try to delete the pid file. At this point it will be
1882          * out-of-date, and some software might be confused by it, so
1883          * let's remove it. */
1884         if (s->pid_file)
1885                 unlink_noerrno(s->pid_file);
1886
1887         return;
1888
1889 fail:
1890         log_warning_unit(UNIT(s)->id,
1891                          "%s failed to run install restart timer: %s",
1892                          UNIT(s)->id, strerror(-r));
1893         service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
1894 }
1895
1896 static void service_enter_stop_post(Service *s, ServiceResult f) {
1897         int r;
1898         assert(s);
1899
1900         if (f != SERVICE_SUCCESS)
1901                 s->result = f;
1902
1903         service_unwatch_control_pid(s);
1904         unit_watch_all_pids(UNIT(s));
1905
1906         s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST];
1907         if (s->control_command) {
1908                 s->control_command_id = SERVICE_EXEC_STOP_POST;
1909
1910                 r = service_spawn(s,
1911                                   s->control_command,
1912                                   true,
1913                                   false,
1914                                   !s->permissions_start_only,
1915                                   !s->root_directory_start_only,
1916                                   true,
1917                                   false,
1918                                   true,
1919                                   &s->control_pid);
1920                 if (r < 0)
1921                         goto fail;
1922
1923                 service_set_state(s, SERVICE_STOP_POST);
1924         } else
1925                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS);
1926
1927         return;
1928
1929 fail:
1930         log_warning_unit(UNIT(s)->id,
1931                          "%s failed to run 'stop-post' task: %s",
1932                          UNIT(s)->id, strerror(-r));
1933         service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
1934 }
1935
1936 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) {
1937         int r;
1938
1939         assert(s);
1940
1941         if (f != SERVICE_SUCCESS)
1942                 s->result = f;
1943
1944         unit_watch_all_pids(UNIT(s));
1945
1946         r = unit_kill_context(
1947                         UNIT(s),
1948                         &s->kill_context,
1949                         state != SERVICE_STOP_SIGTERM && state != SERVICE_FINAL_SIGTERM,
1950                         s->main_pid,
1951                         s->control_pid,
1952                         s->main_pid_alien);
1953
1954         if (r < 0)
1955                 goto fail;
1956
1957         if (r > 0) {
1958                 if (s->timeout_stop_usec > 0) {
1959                         r = service_arm_timer(s, s->timeout_stop_usec);
1960                         if (r < 0)
1961                                 goto fail;
1962                 }
1963
1964                 service_set_state(s, state);
1965         } else if (state == SERVICE_STOP_SIGTERM)
1966                 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS);
1967         else if (state == SERVICE_STOP_SIGKILL)
1968                 service_enter_stop_post(s, SERVICE_SUCCESS);
1969         else if (state == SERVICE_FINAL_SIGTERM)
1970                 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS);
1971         else
1972                 service_enter_dead(s, SERVICE_SUCCESS, true);
1973
1974         return;
1975
1976 fail:
1977         log_warning_unit(UNIT(s)->id,
1978                          "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
1979
1980         if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
1981                 service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES);
1982         else
1983                 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
1984 }
1985
1986 static void service_enter_stop(Service *s, ServiceResult f) {
1987         int r;
1988
1989         assert(s);
1990
1991         if (f != SERVICE_SUCCESS)
1992                 s->result = f;
1993
1994         service_unwatch_control_pid(s);
1995         unit_watch_all_pids(UNIT(s));
1996
1997         s->control_command = s->exec_command[SERVICE_EXEC_STOP];
1998         if (s->control_command) {
1999                 s->control_command_id = SERVICE_EXEC_STOP;
2000
2001                 r = service_spawn(s,
2002                                   s->control_command,
2003                                   true,
2004                                   false,
2005                                   !s->permissions_start_only,
2006                                   !s->root_directory_start_only,
2007                                   false,
2008                                   false,
2009                                   true,
2010                                   &s->control_pid);
2011                 if (r < 0)
2012                         goto fail;
2013
2014                 service_set_state(s, SERVICE_STOP);
2015         } else
2016                 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
2017
2018         return;
2019
2020 fail:
2021         log_warning_unit(UNIT(s)->id,
2022                          "%s failed to run 'stop' task: %s", UNIT(s)->id, strerror(-r));
2023         service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2024 }
2025
2026 static void service_enter_running(Service *s, ServiceResult f) {
2027         int main_pid_ok, cgroup_ok;
2028         assert(s);
2029
2030         if (f != SERVICE_SUCCESS)
2031                 s->result = f;
2032
2033         main_pid_ok = main_pid_good(s);
2034         cgroup_ok = cgroup_good(s);
2035
2036         if ((main_pid_ok > 0 || (main_pid_ok < 0 && cgroup_ok != 0)) &&
2037             (s->bus_name_good || s->type != SERVICE_DBUS))
2038                 service_set_state(s, SERVICE_RUNNING);
2039         else if (s->remain_after_exit)
2040                 service_set_state(s, SERVICE_EXITED);
2041         else
2042                 service_enter_stop(s, SERVICE_SUCCESS);
2043 }
2044
2045 static void service_enter_start_post(Service *s) {
2046         int r;
2047         assert(s);
2048
2049         service_unwatch_control_pid(s);
2050         service_reset_watchdog(s);
2051
2052         s->control_command = s->exec_command[SERVICE_EXEC_START_POST];
2053         if (s->control_command) {
2054                 s->control_command_id = SERVICE_EXEC_START_POST;
2055
2056                 r = service_spawn(s,
2057                                   s->control_command,
2058                                   true,
2059                                   false,
2060                                   !s->permissions_start_only,
2061                                   !s->root_directory_start_only,
2062                                   false,
2063                                   false,
2064                                   true,
2065                                   &s->control_pid);
2066                 if (r < 0)
2067                         goto fail;
2068
2069                 service_set_state(s, SERVICE_START_POST);
2070         } else
2071                 service_enter_running(s, SERVICE_SUCCESS);
2072
2073         return;
2074
2075 fail:
2076         log_warning_unit(UNIT(s)->id,
2077                          "%s failed to run 'start-post' task: %s", UNIT(s)->id, strerror(-r));
2078         service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2079 }
2080
2081 static void service_kill_control_processes(Service *s) {
2082         char *p;
2083
2084         if (!UNIT(s)->cgroup_path)
2085                 return;
2086
2087         p = strappenda(UNIT(s)->cgroup_path, "/control");
2088         cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, p, SIGKILL, true, true, true, NULL);
2089 }
2090
2091 static void service_enter_start(Service *s) {
2092         ExecCommand *c;
2093         pid_t pid;
2094         int r;
2095
2096         assert(s);
2097
2098         assert(s->exec_command[SERVICE_EXEC_START]);
2099         assert(!s->exec_command[SERVICE_EXEC_START]->command_next || s->type == SERVICE_ONESHOT);
2100
2101         service_unwatch_control_pid(s);
2102         service_unwatch_main_pid(s);
2103
2104         /* We want to ensure that nobody leaks processes from
2105          * START_PRE here, so let's go on a killing spree, People
2106          * should not spawn long running processes from START_PRE. */
2107         service_kill_control_processes(s);
2108
2109         if (s->type == SERVICE_FORKING) {
2110                 s->control_command_id = SERVICE_EXEC_START;
2111                 c = s->control_command = s->exec_command[SERVICE_EXEC_START];
2112
2113                 s->main_command = NULL;
2114         } else {
2115                 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
2116                 s->control_command = NULL;
2117
2118                 c = s->main_command = s->exec_command[SERVICE_EXEC_START];
2119         }
2120
2121         r = service_spawn(s,
2122                           c,
2123                           s->type == SERVICE_FORKING || s->type == SERVICE_DBUS ||
2124                             s->type == SERVICE_NOTIFY || s->type == SERVICE_ONESHOT,
2125                           true,
2126                           true,
2127                           true,
2128                           true,
2129                           s->notify_access != NOTIFY_NONE,
2130                           false,
2131                           &pid);
2132         if (r < 0)
2133                 goto fail;
2134
2135         if (s->type == SERVICE_SIMPLE || s->type == SERVICE_IDLE) {
2136                 /* For simple services we immediately start
2137                  * the START_POST binaries. */
2138
2139                 service_set_main_pid(s, pid);
2140                 service_enter_start_post(s);
2141
2142         } else  if (s->type == SERVICE_FORKING) {
2143
2144                 /* For forking services we wait until the start
2145                  * process exited. */
2146
2147                 s->control_pid = pid;
2148                 service_set_state(s, SERVICE_START);
2149
2150         } else if (s->type == SERVICE_ONESHOT ||
2151                    s->type == SERVICE_DBUS ||
2152                    s->type == SERVICE_NOTIFY) {
2153
2154                 /* For oneshot services we wait until the start
2155                  * process exited, too, but it is our main process. */
2156
2157                 /* For D-Bus services we know the main pid right away,
2158                  * but wait for the bus name to appear on the
2159                  * bus. Notify services are similar. */
2160
2161                 service_set_main_pid(s, pid);
2162                 service_set_state(s, SERVICE_START);
2163         } else
2164                 assert_not_reached("Unknown service type");
2165
2166         return;
2167
2168 fail:
2169         log_warning_unit(UNIT(s)->id,
2170                          "%s failed to run 'start' task: %s", UNIT(s)->id, strerror(-r));
2171         service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
2172 }
2173
2174 static void service_enter_start_pre(Service *s) {
2175         int r;
2176
2177         assert(s);
2178
2179         service_unwatch_control_pid(s);
2180
2181         s->control_command = s->exec_command[SERVICE_EXEC_START_PRE];
2182         if (s->control_command) {
2183                 /* Before we start anything, let's clear up what might
2184                  * be left from previous runs. */
2185                 service_kill_control_processes(s);
2186
2187                 s->control_command_id = SERVICE_EXEC_START_PRE;
2188
2189                 r = service_spawn(s,
2190                                   s->control_command,
2191                                   true,
2192                                   false,
2193                                   !s->permissions_start_only,
2194                                   !s->root_directory_start_only,
2195                                   true,
2196                                   false,
2197                                   true,
2198                                   &s->control_pid);
2199                 if (r < 0)
2200                         goto fail;
2201
2202                 service_set_state(s, SERVICE_START_PRE);
2203         } else
2204                 service_enter_start(s);
2205
2206         return;
2207
2208 fail:
2209         log_warning_unit(UNIT(s)->id,
2210                          "%s failed to run 'start-pre' task: %s", UNIT(s)->id, strerror(-r));
2211         service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2212 }
2213
2214 static void service_enter_restart(Service *s) {
2215         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
2216         int r;
2217
2218         assert(s);
2219
2220         if (UNIT(s)->job && UNIT(s)->job->type == JOB_STOP) {
2221                 /* Don't restart things if we are going down anyway */
2222                 log_info_unit(UNIT(s)->id,
2223                               "Stop job pending for unit, delaying automatic restart.");
2224
2225                 r = service_arm_timer(s, s->restart_usec);
2226                 if (r < 0)
2227                         goto fail;
2228
2229                 return;
2230         }
2231
2232         /* Any units that are bound to this service must also be
2233          * restarted. We use JOB_RESTART (instead of the more obvious
2234          * JOB_START) here so that those dependency jobs will be added
2235          * as well. */
2236         r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_FAIL, false, &error, NULL);
2237         if (r < 0)
2238                 goto fail;
2239
2240         /* Note that we stay in the SERVICE_AUTO_RESTART state here,
2241          * it will be canceled as part of the service_stop() call that
2242          * is executed as part of JOB_RESTART. */
2243
2244         log_debug_unit(UNIT(s)->id,
2245                        "%s scheduled restart job.", UNIT(s)->id);
2246         return;
2247
2248 fail:
2249         log_warning_unit(UNIT(s)->id,
2250                          "%s failed to schedule restart job: %s",
2251                          UNIT(s)->id, bus_error_message(&error, -r));
2252         service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
2253 }
2254
2255 static void service_enter_reload(Service *s) {
2256         int r;
2257
2258         assert(s);
2259
2260         service_unwatch_control_pid(s);
2261
2262         s->control_command = s->exec_command[SERVICE_EXEC_RELOAD];
2263         if (s->control_command) {
2264                 s->control_command_id = SERVICE_EXEC_RELOAD;
2265
2266                 r = service_spawn(s,
2267                                   s->control_command,
2268                                   true,
2269                                   false,
2270                                   !s->permissions_start_only,
2271                                   !s->root_directory_start_only,
2272                                   false,
2273                                   false,
2274                                   true,
2275                                   &s->control_pid);
2276                 if (r < 0)
2277                         goto fail;
2278
2279                 service_set_state(s, SERVICE_RELOAD);
2280         } else
2281                 service_enter_running(s, SERVICE_SUCCESS);
2282
2283         return;
2284
2285 fail:
2286         log_warning_unit(UNIT(s)->id,
2287                          "%s failed to run 'reload' task: %s",
2288                          UNIT(s)->id, strerror(-r));
2289         s->reload_result = SERVICE_FAILURE_RESOURCES;
2290         service_enter_running(s, SERVICE_SUCCESS);
2291 }
2292
2293 static void service_run_next_control(Service *s) {
2294         int r;
2295
2296         assert(s);
2297         assert(s->control_command);
2298         assert(s->control_command->command_next);
2299
2300         assert(s->control_command_id != SERVICE_EXEC_START);
2301
2302         s->control_command = s->control_command->command_next;
2303         service_unwatch_control_pid(s);
2304
2305         r = service_spawn(s,
2306                           s->control_command,
2307                           true,
2308                           false,
2309                           !s->permissions_start_only,
2310                           !s->root_directory_start_only,
2311                           s->control_command_id == SERVICE_EXEC_START_PRE ||
2312                           s->control_command_id == SERVICE_EXEC_STOP_POST,
2313                           false,
2314                           true,
2315                           &s->control_pid);
2316         if (r < 0)
2317                 goto fail;
2318
2319         return;
2320
2321 fail:
2322         log_warning_unit(UNIT(s)->id,
2323                          "%s failed to run next control task: %s",
2324                          UNIT(s)->id, strerror(-r));
2325
2326         if (s->state == SERVICE_START_PRE)
2327                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
2328         else if (s->state == SERVICE_STOP)
2329                 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2330         else if (s->state == SERVICE_STOP_POST)
2331                 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2332         else if (s->state == SERVICE_RELOAD) {
2333                 s->reload_result = SERVICE_FAILURE_RESOURCES;
2334                 service_enter_running(s, SERVICE_SUCCESS);
2335         } else
2336                 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2337 }
2338
2339 static void service_run_next_main(Service *s) {
2340         pid_t pid;
2341         int r;
2342
2343         assert(s);
2344         assert(s->main_command);
2345         assert(s->main_command->command_next);
2346         assert(s->type == SERVICE_ONESHOT);
2347
2348         s->main_command = s->main_command->command_next;
2349         service_unwatch_main_pid(s);
2350
2351         r = service_spawn(s,
2352                           s->main_command,
2353                           true,
2354                           true,
2355                           true,
2356                           true,
2357                           true,
2358                           s->notify_access != NOTIFY_NONE,
2359                           false,
2360                           &pid);
2361         if (r < 0)
2362                 goto fail;
2363
2364         service_set_main_pid(s, pid);
2365
2366         return;
2367
2368 fail:
2369         log_warning_unit(UNIT(s)->id,
2370                          "%s failed to run next main task: %s", UNIT(s)->id, strerror(-r));
2371         service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2372 }
2373
2374 static int service_start_limit_test(Service *s) {
2375         assert(s);
2376
2377         if (ratelimit_test(&s->start_limit))
2378                 return 0;
2379
2380         if (s->start_limit_action == SERVICE_START_LIMIT_REBOOT ||
2381             s->start_limit_action == SERVICE_START_LIMIT_REBOOT_FORCE)
2382                 update_reboot_param_file(s->reboot_arg);
2383
2384         switch (s->start_limit_action) {
2385
2386         case SERVICE_START_LIMIT_NONE:
2387                 log_warning_unit(UNIT(s)->id,
2388                                  "%s start request repeated too quickly, refusing to start.",
2389                                  UNIT(s)->id);
2390                 break;
2391
2392         case SERVICE_START_LIMIT_REBOOT: {
2393                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
2394                 int r;
2395
2396                 log_warning_unit(UNIT(s)->id,
2397                                  "%s start request repeated too quickly, rebooting.", UNIT(s)->id);
2398
2399                 r = manager_add_job_by_name(UNIT(s)->manager, JOB_START,
2400                                             SPECIAL_REBOOT_TARGET, JOB_REPLACE,
2401                                             true, &error, NULL);
2402                 if (r < 0)
2403                         log_error_unit(UNIT(s)->id,
2404                                        "Failed to reboot: %s.", bus_error_message(&error, r));
2405
2406                 break;
2407         }
2408
2409         case SERVICE_START_LIMIT_REBOOT_FORCE:
2410                 log_warning_unit(UNIT(s)->id,
2411                                  "%s start request repeated too quickly, forcibly rebooting.", UNIT(s)->id);
2412                 UNIT(s)->manager->exit_code = MANAGER_REBOOT;
2413                 break;
2414
2415         case SERVICE_START_LIMIT_REBOOT_IMMEDIATE:
2416                 log_warning_unit(UNIT(s)->id,
2417                                  "%s start request repeated too quickly, rebooting immediately.", UNIT(s)->id);
2418                 sync();
2419                 if (s->reboot_arg) {
2420                         log_info("Rebooting with argument '%s'.", s->reboot_arg);
2421                         syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
2422                                 LINUX_REBOOT_CMD_RESTART2, s->reboot_arg);
2423                 }
2424
2425                 log_info("Rebooting.");
2426                 reboot(RB_AUTOBOOT);
2427                 break;
2428
2429         default:
2430                 log_error_unit(UNIT(s)->id,
2431                                "start limit action=%i", s->start_limit_action);
2432                 assert_not_reached("Unknown StartLimitAction.");
2433         }
2434
2435         return -ECANCELED;
2436 }
2437
2438 static int service_start(Unit *u) {
2439         Service *s = SERVICE(u);
2440         int r;
2441
2442         assert(s);
2443
2444         /* We cannot fulfill this request right now, try again later
2445          * please! */
2446         if (s->state == SERVICE_STOP ||
2447             s->state == SERVICE_STOP_SIGTERM ||
2448             s->state == SERVICE_STOP_SIGKILL ||
2449             s->state == SERVICE_STOP_POST ||
2450             s->state == SERVICE_FINAL_SIGTERM ||
2451             s->state == SERVICE_FINAL_SIGKILL)
2452                 return -EAGAIN;
2453
2454         /* Already on it! */
2455         if (s->state == SERVICE_START_PRE ||
2456             s->state == SERVICE_START ||
2457             s->state == SERVICE_START_POST)
2458                 return 0;
2459
2460         /* A service that will be restarted must be stopped first to
2461          * trigger BindsTo and/or OnFailure dependencies. If a user
2462          * does not want to wait for the holdoff time to elapse, the
2463          * service should be manually restarted, not started. We
2464          * simply return EAGAIN here, so that any start jobs stay
2465          * queued, and assume that the auto restart timer will
2466          * eventually trigger the restart. */
2467         if (s->state == SERVICE_AUTO_RESTART)
2468                 return -EAGAIN;
2469
2470         assert(s->state == SERVICE_DEAD || s->state == SERVICE_FAILED);
2471
2472         /* Make sure we don't enter a busy loop of some kind. */
2473         r = service_start_limit_test(s);
2474         if (r < 0) {
2475                 service_enter_dead(s, SERVICE_FAILURE_START_LIMIT, false);
2476                 return r;
2477         }
2478
2479         s->result = SERVICE_SUCCESS;
2480         s->reload_result = SERVICE_SUCCESS;
2481         s->main_pid_known = false;
2482         s->main_pid_alien = false;
2483         s->forbid_restart = false;
2484
2485         service_enter_start_pre(s);
2486         return 0;
2487 }
2488
2489 static int service_stop(Unit *u) {
2490         Service *s = SERVICE(u);
2491
2492         assert(s);
2493
2494         /* Don't create restart jobs from here. */
2495         s->forbid_restart = true;
2496
2497         /* Already on it */
2498         if (s->state == SERVICE_STOP ||
2499             s->state == SERVICE_STOP_SIGTERM ||
2500             s->state == SERVICE_STOP_SIGKILL ||
2501             s->state == SERVICE_STOP_POST ||
2502             s->state == SERVICE_FINAL_SIGTERM ||
2503             s->state == SERVICE_FINAL_SIGKILL)
2504                 return 0;
2505
2506         /* A restart will be scheduled or is in progress. */
2507         if (s->state == SERVICE_AUTO_RESTART) {
2508                 service_set_state(s, SERVICE_DEAD);
2509                 return 0;
2510         }
2511
2512         /* If there's already something running we go directly into
2513          * kill mode. */
2514         if (s->state == SERVICE_START_PRE ||
2515             s->state == SERVICE_START ||
2516             s->state == SERVICE_START_POST ||
2517             s->state == SERVICE_RELOAD) {
2518                 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
2519                 return 0;
2520         }
2521
2522         assert(s->state == SERVICE_RUNNING ||
2523                s->state == SERVICE_EXITED);
2524
2525         service_enter_stop(s, SERVICE_SUCCESS);
2526         return 0;
2527 }
2528
2529 static int service_reload(Unit *u) {
2530         Service *s = SERVICE(u);
2531
2532         assert(s);
2533
2534         assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
2535
2536         service_enter_reload(s);
2537         return 0;
2538 }
2539
2540 _pure_ static bool service_can_reload(Unit *u) {
2541         Service *s = SERVICE(u);
2542
2543         assert(s);
2544
2545         return !!s->exec_command[SERVICE_EXEC_RELOAD];
2546 }
2547
2548 static int service_serialize(Unit *u, FILE *f, FDSet *fds) {
2549         Service *s = SERVICE(u);
2550
2551         assert(u);
2552         assert(f);
2553         assert(fds);
2554
2555         unit_serialize_item(u, f, "state", service_state_to_string(s->state));
2556         unit_serialize_item(u, f, "result", service_result_to_string(s->result));
2557         unit_serialize_item(u, f, "reload-result", service_result_to_string(s->reload_result));
2558
2559         if (s->control_pid > 0)
2560                 unit_serialize_item_format(u, f, "control-pid", PID_FMT,
2561                                            s->control_pid);
2562
2563         if (s->main_pid_known && s->main_pid > 0)
2564                 unit_serialize_item_format(u, f, "main-pid", PID_FMT, s->main_pid);
2565
2566         unit_serialize_item(u, f, "main-pid-known", yes_no(s->main_pid_known));
2567
2568         if (s->status_text)
2569                 unit_serialize_item(u, f, "status-text", s->status_text);
2570
2571         /* FIXME: There's a minor uncleanliness here: if there are
2572          * multiple commands attached here, we will start from the
2573          * first one again */
2574         if (s->control_command_id >= 0)
2575                 unit_serialize_item(u, f, "control-command",
2576                                     service_exec_command_to_string(s->control_command_id));
2577
2578         if (s->socket_fd >= 0) {
2579                 int copy;
2580
2581                 if ((copy = fdset_put_dup(fds, s->socket_fd)) < 0)
2582                         return copy;
2583
2584                 unit_serialize_item_format(u, f, "socket-fd", "%i", copy);
2585         }
2586
2587         if (s->main_exec_status.pid > 0) {
2588                 unit_serialize_item_format(u, f, "main-exec-status-pid", PID_FMT,
2589                                            s->main_exec_status.pid);
2590                 dual_timestamp_serialize(f, "main-exec-status-start",
2591                                          &s->main_exec_status.start_timestamp);
2592                 dual_timestamp_serialize(f, "main-exec-status-exit",
2593                                          &s->main_exec_status.exit_timestamp);
2594
2595                 if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
2596                         unit_serialize_item_format(u, f, "main-exec-status-code", "%i",
2597                                                    s->main_exec_status.code);
2598                         unit_serialize_item_format(u, f, "main-exec-status-status", "%i",
2599                                                    s->main_exec_status.status);
2600                 }
2601         }
2602         if (dual_timestamp_is_set(&s->watchdog_timestamp))
2603                 dual_timestamp_serialize(f, "watchdog-timestamp", &s->watchdog_timestamp);
2604
2605         if (s->forbid_restart)
2606                 unit_serialize_item(u, f, "forbid-restart", yes_no(s->forbid_restart));
2607
2608         return 0;
2609 }
2610
2611 static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2612         Service *s = SERVICE(u);
2613
2614         assert(u);
2615         assert(key);
2616         assert(value);
2617         assert(fds);
2618
2619         if (streq(key, "state")) {
2620                 ServiceState state;
2621
2622                 state = service_state_from_string(value);
2623                 if (state < 0)
2624                         log_debug_unit(u->id, "Failed to parse state value %s", value);
2625                 else
2626                         s->deserialized_state = state;
2627         } else if (streq(key, "result")) {
2628                 ServiceResult f;
2629
2630                 f = service_result_from_string(value);
2631                 if (f < 0)
2632                         log_debug_unit(u->id, "Failed to parse result value %s", value);
2633                 else if (f != SERVICE_SUCCESS)
2634                         s->result = f;
2635
2636         } else if (streq(key, "reload-result")) {
2637                 ServiceResult f;
2638
2639                 f = service_result_from_string(value);
2640                 if (f < 0)
2641                         log_debug_unit(u->id, "Failed to parse reload result value %s", value);
2642                 else if (f != SERVICE_SUCCESS)
2643                         s->reload_result = f;
2644
2645         } else if (streq(key, "control-pid")) {
2646                 pid_t pid;
2647
2648                 if (parse_pid(value, &pid) < 0)
2649                         log_debug_unit(u->id, "Failed to parse control-pid value %s", value);
2650                 else
2651                         s->control_pid = pid;
2652         } else if (streq(key, "main-pid")) {
2653                 pid_t pid;
2654
2655                 if (parse_pid(value, &pid) < 0)
2656                         log_debug_unit(u->id, "Failed to parse main-pid value %s", value);
2657                 else {
2658                         service_set_main_pid(s, pid);
2659                         unit_watch_pid(UNIT(s), pid);
2660                 }
2661         } else if (streq(key, "main-pid-known")) {
2662                 int b;
2663
2664                 b = parse_boolean(value);
2665                 if (b < 0)
2666                         log_debug_unit(u->id, "Failed to parse main-pid-known value %s", value);
2667                 else
2668                         s->main_pid_known = b;
2669         } else if (streq(key, "status-text")) {
2670                 char *t;
2671
2672                 t = strdup(value);
2673                 if (!t)
2674                         log_oom();
2675                 else {
2676                         free(s->status_text);
2677                         s->status_text = t;
2678                 }
2679
2680         } else if (streq(key, "control-command")) {
2681                 ServiceExecCommand id;
2682
2683                 id = service_exec_command_from_string(value);
2684                 if (id < 0)
2685                         log_debug_unit(u->id, "Failed to parse exec-command value %s", value);
2686                 else {
2687                         s->control_command_id = id;
2688                         s->control_command = s->exec_command[id];
2689                 }
2690         } else if (streq(key, "socket-fd")) {
2691                 int fd;
2692
2693                 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2694                         log_debug_unit(u->id, "Failed to parse socket-fd value %s", value);
2695                 else {
2696
2697                         safe_close(s->socket_fd);
2698                         s->socket_fd = fdset_remove(fds, fd);
2699                 }
2700         } else if (streq(key, "main-exec-status-pid")) {
2701                 pid_t pid;
2702
2703                 if (parse_pid(value, &pid) < 0)
2704                         log_debug_unit(u->id, "Failed to parse main-exec-status-pid value %s", value);
2705                 else
2706                         s->main_exec_status.pid = pid;
2707         } else if (streq(key, "main-exec-status-code")) {
2708                 int i;
2709
2710                 if (safe_atoi(value, &i) < 0)
2711                         log_debug_unit(u->id, "Failed to parse main-exec-status-code value %s", value);
2712                 else
2713                         s->main_exec_status.code = i;
2714         } else if (streq(key, "main-exec-status-status")) {
2715                 int i;
2716
2717                 if (safe_atoi(value, &i) < 0)
2718                         log_debug_unit(u->id, "Failed to parse main-exec-status-status value %s", value);
2719                 else
2720                         s->main_exec_status.status = i;
2721         } else if (streq(key, "main-exec-status-start"))
2722                 dual_timestamp_deserialize(value, &s->main_exec_status.start_timestamp);
2723         else if (streq(key, "main-exec-status-exit"))
2724                 dual_timestamp_deserialize(value, &s->main_exec_status.exit_timestamp);
2725         else if (streq(key, "watchdog-timestamp"))
2726                 dual_timestamp_deserialize(value, &s->watchdog_timestamp);
2727         else if (streq(key, "forbid-restart")) {
2728                 int b;
2729
2730                 b = parse_boolean(value);
2731                 if (b < 0)
2732                         log_debug_unit(u->id, "Failed to parse forbid-restart value %s", value);
2733                 else
2734                         s->forbid_restart = b;
2735         } else
2736                 log_debug_unit(u->id, "Unknown serialization key '%s'", key);
2737
2738         return 0;
2739 }
2740
2741 _pure_ static UnitActiveState service_active_state(Unit *u) {
2742         const UnitActiveState *table;
2743
2744         assert(u);
2745
2746         table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
2747
2748         return table[SERVICE(u)->state];
2749 }
2750
2751 static const char *service_sub_state_to_string(Unit *u) {
2752         assert(u);
2753
2754         return service_state_to_string(SERVICE(u)->state);
2755 }
2756
2757 static bool service_check_gc(Unit *u) {
2758         Service *s = SERVICE(u);
2759
2760         assert(s);
2761
2762         /* Never clean up services that still have a process around,
2763          * even if the service is formally dead. */
2764         if (cgroup_good(s) > 0 ||
2765             main_pid_good(s) > 0 ||
2766             control_pid_good(s) > 0)
2767                 return true;
2768
2769 #ifdef HAVE_SYSV_COMPAT
2770         if (s->is_sysv)
2771                 return true;
2772 #endif
2773
2774         return false;
2775 }
2776
2777 _pure_ static bool service_check_snapshot(Unit *u) {
2778         Service *s = SERVICE(u);
2779
2780         assert(s);
2781
2782         return (s->socket_fd < 0);
2783 }
2784
2785 static int service_retry_pid_file(Service *s) {
2786         int r;
2787
2788         assert(s->pid_file);
2789         assert(s->state == SERVICE_START || s->state == SERVICE_START_POST);
2790
2791         r = service_load_pid_file(s, false);
2792         if (r < 0)
2793                 return r;
2794
2795         service_unwatch_pid_file(s);
2796
2797         service_enter_running(s, SERVICE_SUCCESS);
2798         return 0;
2799 }
2800
2801 static int service_watch_pid_file(Service *s) {
2802         int r;
2803
2804         log_debug_unit(UNIT(s)->id,
2805                        "Setting watch for %s's PID file %s",
2806                        UNIT(s)->id, s->pid_file_pathspec->path);
2807         r = path_spec_watch(s->pid_file_pathspec, service_dispatch_io);
2808         if (r < 0)
2809                 goto fail;
2810
2811         /* the pidfile might have appeared just before we set the watch */
2812         log_debug_unit(UNIT(s)->id,
2813                        "Trying to read %s's PID file %s in case it changed",
2814                        UNIT(s)->id, s->pid_file_pathspec->path);
2815         service_retry_pid_file(s);
2816
2817         return 0;
2818 fail:
2819         log_error_unit(UNIT(s)->id,
2820                        "Failed to set a watch for %s's PID file %s: %s",
2821                        UNIT(s)->id, s->pid_file_pathspec->path, strerror(-r));
2822         service_unwatch_pid_file(s);
2823         return r;
2824 }
2825
2826 static int service_demand_pid_file(Service *s) {
2827         PathSpec *ps;
2828
2829         assert(s->pid_file);
2830         assert(!s->pid_file_pathspec);
2831
2832         ps = new0(PathSpec, 1);
2833         if (!ps)
2834                 return -ENOMEM;
2835
2836         ps->unit = UNIT(s);
2837         ps->path = strdup(s->pid_file);
2838         if (!ps->path) {
2839                 free(ps);
2840                 return -ENOMEM;
2841         }
2842
2843         path_kill_slashes(ps->path);
2844
2845         /* PATH_CHANGED would not be enough. There are daemons (sendmail) that
2846          * keep their PID file open all the time. */
2847         ps->type = PATH_MODIFIED;
2848         ps->inotify_fd = -1;
2849
2850         s->pid_file_pathspec = ps;
2851
2852         return service_watch_pid_file(s);
2853 }
2854
2855 static int service_dispatch_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
2856         PathSpec *p = userdata;
2857         Service *s;
2858
2859         assert(p);
2860
2861         s = SERVICE(p->unit);
2862
2863         assert(s);
2864         assert(fd >= 0);
2865         assert(s->state == SERVICE_START || s->state == SERVICE_START_POST);
2866         assert(s->pid_file_pathspec);
2867         assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd));
2868
2869         log_debug_unit(UNIT(s)->id, "inotify event for %s", UNIT(s)->id);
2870
2871         if (path_spec_fd_event(p, events) < 0)
2872                 goto fail;
2873
2874         if (service_retry_pid_file(s) == 0)
2875                 return 0;
2876
2877         if (service_watch_pid_file(s) < 0)
2878                 goto fail;
2879
2880         return 0;
2881
2882 fail:
2883         service_unwatch_pid_file(s);
2884         service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2885         return 0;
2886 }
2887
2888 static void service_notify_cgroup_empty_event(Unit *u) {
2889         Service *s = SERVICE(u);
2890
2891         assert(u);
2892
2893         log_debug_unit(u->id, "%s: cgroup is empty", u->id);
2894
2895         switch (s->state) {
2896
2897                 /* Waiting for SIGCHLD is usually more interesting,
2898                  * because it includes return codes/signals. Which is
2899                  * why we ignore the cgroup events for most cases,
2900                  * except when we don't know pid which to expect the
2901                  * SIGCHLD for. */
2902
2903         case SERVICE_START:
2904         case SERVICE_START_POST:
2905                 /* If we were hoping for the daemon to write its PID file,
2906                  * we can give up now. */
2907                 if (s->pid_file_pathspec) {
2908                         log_warning_unit(u->id,
2909                                          "%s never wrote its PID file. Failing.", UNIT(s)->id);
2910                         service_unwatch_pid_file(s);
2911                         if (s->state == SERVICE_START)
2912                                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
2913                         else
2914                                 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2915                 }
2916                 break;
2917
2918         case SERVICE_RUNNING:
2919                 /* service_enter_running() will figure out what to do */
2920                 service_enter_running(s, SERVICE_SUCCESS);
2921                 break;
2922
2923         case SERVICE_STOP_SIGTERM:
2924         case SERVICE_STOP_SIGKILL:
2925
2926                 if (main_pid_good(s) <= 0 && !control_pid_good(s))
2927                         service_enter_stop_post(s, SERVICE_SUCCESS);
2928
2929                 break;
2930
2931         case SERVICE_STOP_POST:
2932         case SERVICE_FINAL_SIGTERM:
2933         case SERVICE_FINAL_SIGKILL:
2934                 if (main_pid_good(s) <= 0 && !control_pid_good(s))
2935                         service_enter_dead(s, SERVICE_SUCCESS, true);
2936
2937                 break;
2938
2939         default:
2940                 ;
2941         }
2942 }
2943
2944 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2945         Service *s = SERVICE(u);
2946         ServiceResult f;
2947
2948         assert(s);
2949         assert(pid >= 0);
2950
2951         if (UNIT(s)->fragment_path ? is_clean_exit(code, status, &s->success_status) :
2952                                      is_clean_exit_lsb(code, status, &s->success_status))
2953                 f = SERVICE_SUCCESS;
2954         else if (code == CLD_EXITED)
2955                 f = SERVICE_FAILURE_EXIT_CODE;
2956         else if (code == CLD_KILLED)
2957                 f = SERVICE_FAILURE_SIGNAL;
2958         else if (code == CLD_DUMPED)
2959                 f = SERVICE_FAILURE_CORE_DUMP;
2960         else
2961                 assert_not_reached("Unknown code");
2962
2963         if (s->main_pid == pid) {
2964                 /* Forking services may occasionally move to a new PID.
2965                  * As long as they update the PID file before exiting the old
2966                  * PID, they're fine. */
2967                 if (service_load_pid_file(s, false) == 0)
2968                         return;
2969
2970                 s->main_pid = 0;
2971                 exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status);
2972
2973                 if (s->main_command) {
2974                         /* If this is not a forking service than the
2975                          * main process got started and hence we copy
2976                          * the exit status so that it is recorded both
2977                          * as main and as control process exit
2978                          * status */
2979
2980                         s->main_command->exec_status = s->main_exec_status;
2981
2982                         if (s->main_command->ignore)
2983                                 f = SERVICE_SUCCESS;
2984                 } else if (s->exec_command[SERVICE_EXEC_START]) {
2985
2986                         /* If this is a forked process, then we should
2987                          * ignore the return value if this was
2988                          * configured for the starter process */
2989
2990                         if (s->exec_command[SERVICE_EXEC_START]->ignore)
2991                                 f = SERVICE_SUCCESS;
2992                 }
2993
2994                 log_struct_unit(f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
2995                            u->id,
2996                            "MESSAGE=%s: main process exited, code=%s, status=%i/%s",
2997                                   u->id, sigchld_code_to_string(code), status,
2998                                   strna(code == CLD_EXITED
2999                                         ? exit_status_to_string(status, EXIT_STATUS_FULL)
3000                                         : signal_to_string(status)),
3001                            "EXIT_CODE=%s", sigchld_code_to_string(code),
3002                            "EXIT_STATUS=%i", status,
3003                            NULL);
3004
3005                 if (f != SERVICE_SUCCESS)
3006                         s->result = f;
3007
3008                 if (s->main_command &&
3009                     s->main_command->command_next &&
3010                     f == SERVICE_SUCCESS) {
3011
3012                         /* There is another command to *
3013                          * execute, so let's do that. */
3014
3015                         log_debug_unit(u->id,
3016                                        "%s running next main command for state %s",
3017                                        u->id, service_state_to_string(s->state));
3018                         service_run_next_main(s);
3019
3020                 } else {
3021
3022                         /* The service exited, so the service is officially
3023                          * gone. */
3024                         s->main_command = NULL;
3025
3026                         switch (s->state) {
3027
3028                         case SERVICE_START_POST:
3029                         case SERVICE_RELOAD:
3030                         case SERVICE_STOP:
3031                                 /* Need to wait until the operation is
3032                                  * done */
3033                                 break;
3034
3035                         case SERVICE_START:
3036                                 if (s->type == SERVICE_ONESHOT) {
3037                                         /* This was our main goal, so let's go on */
3038                                         if (f == SERVICE_SUCCESS)
3039                                                 service_enter_start_post(s);
3040                                         else
3041                                                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
3042                                         break;
3043                                 }
3044
3045                                 /* Fall through */
3046
3047                         case SERVICE_RUNNING:
3048                                 service_enter_running(s, f);
3049                                 break;
3050
3051                         case SERVICE_STOP_SIGTERM:
3052                         case SERVICE_STOP_SIGKILL:
3053
3054                                 if (!control_pid_good(s))
3055                                         service_enter_stop_post(s, f);
3056
3057                                 /* If there is still a control process, wait for that first */
3058                                 break;
3059
3060                         case SERVICE_STOP_POST:
3061                         case SERVICE_FINAL_SIGTERM:
3062                         case SERVICE_FINAL_SIGKILL:
3063
3064                                 if (!control_pid_good(s))
3065                                         service_enter_dead(s, f, true);
3066                                 break;
3067
3068                         default:
3069                                 assert_not_reached("Uh, main process died at wrong time.");
3070                         }
3071                 }
3072
3073         } else if (s->control_pid == pid) {
3074                 s->control_pid = 0;
3075
3076                 if (s->control_command) {
3077                         exec_status_exit(&s->control_command->exec_status,
3078                                          &s->exec_context, pid, code, status);
3079
3080                         if (s->control_command->ignore)
3081                                 f = SERVICE_SUCCESS;
3082                 }
3083
3084                 log_full_unit(f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE, u->id,
3085                               "%s: control process exited, code=%s status=%i",
3086                               u->id, sigchld_code_to_string(code), status);
3087
3088                 if (f != SERVICE_SUCCESS)
3089                         s->result = f;
3090
3091                 /* Immediately get rid of the cgroup, so that the
3092                  * kernel doesn't delay the cgroup empty messages for
3093                  * the service cgroup any longer than necessary */
3094                 service_kill_control_processes(s);
3095
3096                 if (s->control_command &&
3097                     s->control_command->command_next &&
3098                     f == SERVICE_SUCCESS) {
3099
3100                         /* There is another command to *
3101                          * execute, so let's do that. */
3102
3103                         log_debug_unit(u->id,
3104                                        "%s running next control command for state %s",
3105                                        u->id, service_state_to_string(s->state));
3106                         service_run_next_control(s);
3107
3108                 } else {
3109                         /* No further commands for this step, so let's
3110                          * figure out what to do next */
3111
3112                         s->control_command = NULL;
3113                         s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
3114
3115                         log_debug_unit(u->id,
3116                                        "%s got final SIGCHLD for state %s",
3117                                        u->id, service_state_to_string(s->state));
3118
3119                         switch (s->state) {
3120
3121                         case SERVICE_START_PRE:
3122                                 if (f == SERVICE_SUCCESS)
3123                                         service_enter_start(s);
3124                                 else
3125                                         service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
3126                                 break;
3127
3128                         case SERVICE_START:
3129                                 if (s->type != SERVICE_FORKING)
3130                                         /* Maybe spurious event due to a reload that changed the type? */
3131                                         break;
3132
3133                                 if (f != SERVICE_SUCCESS) {
3134                                         service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
3135                                         break;
3136                                 }
3137
3138                                 if (s->pid_file) {
3139                                         bool has_start_post;
3140                                         int r;
3141
3142                                         /* Let's try to load the pid file here if we can.
3143                                          * The PID file might actually be created by a START_POST
3144                                          * script. In that case don't worry if the loading fails. */
3145
3146                                         has_start_post = !!s->exec_command[SERVICE_EXEC_START_POST];
3147                                         r = service_load_pid_file(s, !has_start_post);
3148                                         if (!has_start_post && r < 0) {
3149                                                 r = service_demand_pid_file(s);
3150                                                 if (r < 0 || !cgroup_good(s))
3151                                                         service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
3152                                                 break;
3153                                         }
3154                                 } else
3155                                         service_search_main_pid(s);
3156
3157                                 service_enter_start_post(s);
3158                                 break;
3159
3160                         case SERVICE_START_POST:
3161                                 if (f != SERVICE_SUCCESS) {
3162                                         service_enter_stop(s, f);
3163                                         break;
3164                                 }
3165
3166                                 if (s->pid_file) {
3167                                         int r;
3168
3169                                         r = service_load_pid_file(s, true);
3170                                         if (r < 0) {
3171                                                 r = service_demand_pid_file(s);
3172                                                 if (r < 0 || !cgroup_good(s))
3173                                                         service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
3174                                                 break;
3175                                         }
3176                                 } else
3177                                         service_search_main_pid(s);
3178
3179                                 service_enter_running(s, SERVICE_SUCCESS);
3180                                 break;
3181
3182                         case SERVICE_RELOAD:
3183                                 if (f == SERVICE_SUCCESS) {
3184                                         service_load_pid_file(s, true);
3185                                         service_search_main_pid(s);
3186                                 }
3187
3188                                 s->reload_result = f;
3189                                 service_enter_running(s, SERVICE_SUCCESS);
3190                                 break;
3191
3192                         case SERVICE_STOP:
3193                                 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3194                                 break;
3195
3196                         case SERVICE_STOP_SIGTERM:
3197                         case SERVICE_STOP_SIGKILL:
3198                                 if (main_pid_good(s) <= 0)
3199                                         service_enter_stop_post(s, f);
3200
3201                                 /* If there is still a service
3202                                  * process around, wait until
3203                                  * that one quit, too */
3204                                 break;
3205
3206                         case SERVICE_STOP_POST:
3207                         case SERVICE_FINAL_SIGTERM:
3208                         case SERVICE_FINAL_SIGKILL:
3209                                 if (main_pid_good(s) <= 0)
3210                                         service_enter_dead(s, f, true);
3211                                 break;
3212
3213                         default:
3214                                 assert_not_reached("Uh, control process died at wrong time.");
3215                         }
3216                 }
3217         }
3218
3219         /* Notify clients about changed exit status */
3220         unit_add_to_dbus_queue(u);
3221
3222         /* We got one SIGCHLD for the service, let's watch all
3223          * processes that are now running of the service, and watch
3224          * that. Among the PIDs we then watch will be children
3225          * reassigned to us, which hopefully allows us to identify
3226          * when all children are gone */
3227         unit_tidy_watch_pids(u, s->main_pid, s->control_pid);
3228         unit_watch_all_pids(u);
3229
3230         /* If the PID set is empty now, then let's finish this off */
3231         if (set_isempty(u->pids))
3232                 service_notify_cgroup_empty_event(u);
3233 }
3234
3235 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3236         Service *s = SERVICE(userdata);
3237
3238         assert(s);
3239         assert(source == s->timer_event_source);
3240
3241         switch (s->state) {
3242
3243         case SERVICE_START_PRE:
3244         case SERVICE_START:
3245                 log_warning_unit(UNIT(s)->id,
3246                                  "%s %s operation timed out. Terminating.",
3247                                  UNIT(s)->id,
3248                                  s->state == SERVICE_START ? "start" : "start-pre");
3249                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3250                 break;
3251
3252         case SERVICE_START_POST:
3253                 log_warning_unit(UNIT(s)->id,
3254                                  "%s start-post operation timed out. Stopping.", UNIT(s)->id);
3255                 service_enter_stop(s, SERVICE_FAILURE_TIMEOUT);
3256                 break;
3257
3258         case SERVICE_RELOAD:
3259                 log_warning_unit(UNIT(s)->id,
3260                                  "%s reload operation timed out. Stopping.", UNIT(s)->id);
3261                 s->reload_result = SERVICE_FAILURE_TIMEOUT;
3262                 service_enter_running(s, SERVICE_SUCCESS);
3263                 break;
3264
3265         case SERVICE_STOP:
3266                 log_warning_unit(UNIT(s)->id,
3267                                  "%s stopping timed out. Terminating.", UNIT(s)->id);
3268                 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3269                 break;
3270
3271         case SERVICE_STOP_SIGTERM:
3272                 if (s->kill_context.send_sigkill) {
3273                         log_warning_unit(UNIT(s)->id,
3274                                          "%s stop-sigterm timed out. Killing.", UNIT(s)->id);
3275                         service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_TIMEOUT);
3276                 } else {
3277                         log_warning_unit(UNIT(s)->id,
3278                                          "%s stop-sigterm timed out. Skipping SIGKILL.", UNIT(s)->id);
3279                         service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
3280                 }
3281
3282                 break;
3283
3284         case SERVICE_STOP_SIGKILL:
3285                 /* Uh, we sent a SIGKILL and it is still not gone?
3286                  * Must be something we cannot kill, so let's just be
3287                  * weirded out and continue */
3288
3289                 log_warning_unit(UNIT(s)->id,
3290                                  "%s still around after SIGKILL. Ignoring.", UNIT(s)->id);
3291                 service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
3292                 break;
3293
3294         case SERVICE_STOP_POST:
3295                 log_warning_unit(UNIT(s)->id,
3296                                  "%s stop-post timed out. Terminating.", UNIT(s)->id);
3297                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3298                 break;
3299
3300         case SERVICE_FINAL_SIGTERM:
3301                 if (s->kill_context.send_sigkill) {
3302                         log_warning_unit(UNIT(s)->id,
3303                                          "%s stop-final-sigterm timed out. Killing.", UNIT(s)->id);
3304                         service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_TIMEOUT);
3305                 } else {
3306                         log_warning_unit(UNIT(s)->id,
3307                                          "%s stop-final-sigterm timed out. Skipping SIGKILL. Entering failed mode.",
3308                                          UNIT(s)->id);
3309                         service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, false);
3310                 }
3311
3312                 break;
3313
3314         case SERVICE_FINAL_SIGKILL:
3315                 log_warning_unit(UNIT(s)->id,
3316                                  "%s still around after final SIGKILL. Entering failed mode.", UNIT(s)->id);
3317                 service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, true);
3318                 break;
3319
3320         case SERVICE_AUTO_RESTART:
3321                 log_info_unit(UNIT(s)->id,
3322                               s->restart_usec > 0 ?
3323                               "%s holdoff time over, scheduling restart." :
3324                               "%s has no holdoff time, scheduling restart.",
3325                               UNIT(s)->id);
3326                 service_enter_restart(s);
3327                 break;
3328
3329         default:
3330                 assert_not_reached("Timeout at wrong time.");
3331         }
3332
3333         return 0;
3334 }
3335
3336 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata) {
3337         Service *s = SERVICE(userdata);
3338
3339         assert(s);
3340         assert(source == s->watchdog_event_source);
3341
3342         log_error_unit(UNIT(s)->id, "%s watchdog timeout!", UNIT(s)->id);
3343         service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_WATCHDOG);
3344
3345         return 0;
3346 }
3347
3348 static void service_notify_message(Unit *u, pid_t pid, char **tags) {
3349         Service *s = SERVICE(u);
3350         const char *e;
3351         bool notify_dbus = false;
3352
3353         assert(u);
3354
3355         log_debug_unit(u->id, "%s: Got notification message from PID "PID_FMT" (%s...)",
3356                        u->id, pid, tags && *tags ? tags[0] : "(empty)");
3357
3358         if (s->notify_access == NOTIFY_NONE) {
3359                 log_warning_unit(u->id,
3360                                  "%s: Got notification message from PID "PID_FMT", but reception is disabled.",
3361                                  u->id, pid);
3362                 return;
3363         }
3364
3365         if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) {
3366
3367                 if (s->main_pid != 0)
3368                         log_warning_unit(u->id, "%s: Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, u->id, pid, s->main_pid);
3369                 else
3370                         log_debug_unit(u->id, "%s: Got notification message from PID "PID_FMT", but reception only permitted for main PID which is currently not known", u->id, pid);
3371                 return;
3372         }
3373
3374         /* Interpret MAINPID= */
3375         if ((e = strv_find_prefix(tags, "MAINPID=")) &&
3376             (s->state == SERVICE_START ||
3377              s->state == SERVICE_START_POST ||
3378              s->state == SERVICE_RUNNING ||
3379              s->state == SERVICE_RELOAD)) {
3380
3381                 if (parse_pid(e + 8, &pid) < 0)
3382                         log_warning_unit(u->id, "Failed to parse notification message %s", e);
3383                 else {
3384                         log_debug_unit(u->id, "%s: got %s", u->id, e);
3385                         service_set_main_pid(s, pid);
3386                         unit_watch_pid(UNIT(s), pid);
3387                         notify_dbus = true;
3388                 }
3389         }
3390
3391         /* Interpret READY= */
3392         if (s->type == SERVICE_NOTIFY && s->state == SERVICE_START && strv_find(tags, "READY=1")) {
3393                 log_debug_unit(u->id, "%s: got READY=1", u->id);
3394                 service_enter_start_post(s);
3395                 notify_dbus = true;
3396         }
3397
3398         /* Interpret STATUS= */
3399         e = strv_find_prefix(tags, "STATUS=");
3400         if (e) {
3401                 char *t;
3402
3403                 if (e[7]) {
3404                         if (!utf8_is_valid(e+7)) {
3405                                 log_warning_unit(u->id, "Status message in notification is not UTF-8 clean.");
3406                                 return;
3407                         }
3408
3409                         log_debug_unit(u->id, "%s: got %s", u->id, e);
3410
3411                         t = strdup(e+7);
3412                         if (!t) {
3413                                 log_oom();
3414                                 return;
3415                         }
3416
3417                 } else
3418                         t = NULL;
3419
3420                 if (!streq_ptr(s->status_text, t)) {
3421                         free(s->status_text);
3422                         s->status_text = t;
3423                         notify_dbus = true;
3424                 } else
3425                         free(t);
3426         }
3427
3428         /* Interpret WATCHDOG= */
3429         if (strv_find(tags, "WATCHDOG=1")) {
3430                 log_debug_unit(u->id, "%s: got WATCHDOG=1", u->id);
3431                 service_reset_watchdog(s);
3432         }
3433
3434         /* Notify clients about changed status or main pid */
3435         if (notify_dbus)
3436                 unit_add_to_dbus_queue(u);
3437 }
3438
3439 static int service_get_timeout(Unit *u, uint64_t *timeout) {
3440         Service *s = SERVICE(u);
3441         int r;
3442
3443         if (!s->timer_event_source)
3444                 return 0;
3445
3446         r = sd_event_source_get_time(s->timer_event_source, timeout);
3447         if (r < 0)
3448                 return r;
3449
3450         return 1;
3451 }
3452
3453 #ifdef HAVE_SYSV_COMPAT
3454
3455 static int service_enumerate(Manager *m) {
3456         char **p;
3457         unsigned i;
3458         _cleanup_closedir_ DIR *d = NULL;
3459         _cleanup_free_ char *path = NULL, *fpath = NULL, *name = NULL;
3460         Set *runlevel_services[ELEMENTSOF(rcnd_table)] = {};
3461         _cleanup_set_free_ Set *shutdown_services = NULL;
3462         Unit *service;
3463         Iterator j;
3464         int r;
3465
3466         assert(m);
3467
3468         if (m->running_as != SYSTEMD_SYSTEM)
3469                 return 0;
3470
3471         STRV_FOREACH(p, m->lookup_paths.sysvrcnd_path)
3472                 for (i = 0; i < ELEMENTSOF(rcnd_table); i ++) {
3473                         struct dirent *de;
3474
3475                         free(path);
3476                         path = strjoin(*p, "/", rcnd_table[i].path, NULL);
3477                         if (!path) {
3478                                 r = -ENOMEM;
3479                                 goto finish;
3480                         }
3481
3482                         if (d)
3483                                 closedir(d);
3484
3485                         d = opendir(path);
3486                         if (!d) {
3487                                 if (errno != ENOENT)
3488                                         log_warning("opendir(%s) failed: %m", path);
3489
3490                                 continue;
3491                         }
3492
3493                         while ((de = readdir(d))) {
3494                                 int a, b;
3495
3496                                 if (ignore_file(de->d_name))
3497                                         continue;
3498
3499                                 if (de->d_name[0] != 'S' && de->d_name[0] != 'K')
3500                                         continue;
3501
3502                                 if (strlen(de->d_name) < 4)
3503                                         continue;
3504
3505                                 a = undecchar(de->d_name[1]);
3506                                 b = undecchar(de->d_name[2]);
3507
3508                                 if (a < 0 || b < 0)
3509                                         continue;
3510
3511                                 free(fpath);
3512                                 fpath = strjoin(path, "/", de->d_name, NULL);
3513                                 if (!fpath) {
3514                                         r = -ENOMEM;
3515                                         goto finish;
3516                                 }
3517
3518                                 if (access(fpath, X_OK) < 0) {
3519
3520                                         if (errno != ENOENT)
3521                                                 log_warning("access() failed on %s: %m", fpath);
3522
3523                                         continue;
3524                                 }
3525
3526                                 free(name);
3527                                 name = sysv_translate_name(de->d_name + 3);
3528                                 if (!name) {
3529                                         r = log_oom();
3530                                         goto finish;
3531                                 }
3532
3533                                 r = manager_load_unit_prepare(m, name, NULL, NULL, &service);
3534                                 if (r < 0) {
3535                                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
3536                                         continue;
3537                                 }
3538
3539                                 if (de->d_name[0] == 'S')  {
3540
3541                                         if (rcnd_table[i].type == RUNLEVEL_UP) {
3542                                                 SERVICE(service)->sysv_start_priority_from_rcnd =
3543                                                         MAX(a*10 + b, SERVICE(service)->sysv_start_priority_from_rcnd);
3544
3545                                                 SERVICE(service)->sysv_enabled = true;
3546                                         }
3547
3548                                         r = set_ensure_allocated(&runlevel_services[i],
3549                                                                  trivial_hash_func, trivial_compare_func);
3550                                         if (r < 0)
3551                                                 goto finish;
3552
3553                                         r = set_put(runlevel_services[i], service);
3554                                         if (r < 0)
3555                                                 goto finish;
3556
3557                                 } else if (de->d_name[0] == 'K' &&
3558                                            (rcnd_table[i].type == RUNLEVEL_DOWN)) {
3559
3560                                         r = set_ensure_allocated(&shutdown_services,
3561                                                                  trivial_hash_func, trivial_compare_func);
3562                                         if (r < 0)
3563                                                 goto finish;
3564
3565                                         r = set_put(shutdown_services, service);
3566                                         if (r < 0)
3567                                                 goto finish;
3568                                 }
3569                         }
3570                 }
3571
3572         /* Now we loaded all stubs and are aware of the lowest
3573         start-up priority for all services, not let's actually load
3574         the services, this will also tell us which services are
3575         actually native now */
3576         manager_dispatch_load_queue(m);
3577
3578         /* If this is a native service, rely on native ways to pull in
3579          * a service, don't pull it in via sysv rcN.d links. */
3580         for (i = 0; i < ELEMENTSOF(rcnd_table); i ++)
3581                 SET_FOREACH(service, runlevel_services[i], j) {
3582                         service = unit_follow_merge(service);
3583
3584                         if (service->fragment_path)
3585                                 continue;
3586
3587                         r = unit_add_two_dependencies_by_name_inverse(
3588                                 service, UNIT_AFTER, UNIT_WANTS,
3589                                 rcnd_table[i].target, NULL, true);
3590                         if (r < 0)
3591                                 goto finish;
3592                 }
3593
3594         /* We honour K links only for halt/reboot. For the normal
3595          * runlevels we assume the stop jobs will be implicitly added
3596          * by the core logic. Also, we don't really distinguish here
3597          * between the runlevels 0 and 6 and just add them to the
3598          * special shutdown target. */
3599         SET_FOREACH(service, shutdown_services, j) {
3600                 service = unit_follow_merge(service);
3601
3602                 if (service->fragment_path)
3603                         continue;
3604
3605                 r = unit_add_two_dependencies_by_name(
3606                         service, UNIT_BEFORE, UNIT_CONFLICTS,
3607                         SPECIAL_SHUTDOWN_TARGET, NULL, true);
3608                 if (r < 0)
3609                         goto finish;
3610         }
3611
3612         r = 0;
3613
3614 finish:
3615
3616         for (i = 0; i < ELEMENTSOF(rcnd_table); i++)
3617                 set_free(runlevel_services[i]);
3618
3619         return r;
3620 }
3621 #endif
3622
3623 static void service_bus_name_owner_change(
3624                 Unit *u,
3625                 const char *name,
3626                 const char *old_owner,
3627                 const char *new_owner) {
3628
3629         Service *s = SERVICE(u);
3630         int r;
3631
3632         assert(s);
3633         assert(name);
3634
3635         assert(streq(s->bus_name, name));
3636         assert(old_owner || new_owner);
3637
3638         if (old_owner && new_owner)
3639                 log_debug_unit(u->id,
3640                                "%s's D-Bus name %s changed owner from %s to %s",
3641                                u->id, name, old_owner, new_owner);
3642         else if (old_owner)
3643                 log_debug_unit(u->id,
3644                                "%s's D-Bus name %s no longer registered by %s",
3645                                u->id, name, old_owner);
3646         else
3647                 log_debug_unit(u->id,
3648                                "%s's D-Bus name %s now registered by %s",
3649                                u->id, name, new_owner);
3650
3651         s->bus_name_good = !!new_owner;
3652
3653         if (s->type == SERVICE_DBUS) {
3654
3655                 /* service_enter_running() will figure out what to
3656                  * do */
3657                 if (s->state == SERVICE_RUNNING)
3658                         service_enter_running(s, SERVICE_SUCCESS);
3659                 else if (s->state == SERVICE_START && new_owner)
3660                         service_enter_start_post(s);
3661
3662         } else if (new_owner &&
3663                    s->main_pid <= 0 &&
3664                    (s->state == SERVICE_START ||
3665                     s->state == SERVICE_START_POST ||
3666                     s->state == SERVICE_RUNNING ||
3667                     s->state == SERVICE_RELOAD)) {
3668
3669                 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
3670                 pid_t pid;
3671
3672                 /* Try to acquire PID from bus service */
3673
3674                 r = sd_bus_get_owner(u->manager->api_bus, name, SD_BUS_CREDS_PID, &creds);
3675                 if (r >= 0)
3676                         r = sd_bus_creds_get_pid(creds, &pid);
3677                 if (r >= 0) {
3678                         log_debug_unit(u->id, "%s's D-Bus name %s is now owned by process %u", u->id, name, (unsigned) pid);
3679
3680                         service_set_main_pid(s, pid);
3681                         unit_watch_pid(UNIT(s), pid);
3682                 }
3683         }
3684 }
3685
3686 int service_set_socket_fd(Service *s, int fd, Socket *sock) {
3687         _cleanup_free_ char *peer = NULL;
3688         int r;
3689
3690         assert(s);
3691         assert(fd >= 0);
3692
3693         /* This is called by the socket code when instantiating a new
3694          * service for a stream socket and the socket needs to be
3695          * configured. */
3696
3697         if (UNIT(s)->load_state != UNIT_LOADED)
3698                 return -EINVAL;
3699
3700         if (s->socket_fd >= 0)
3701                 return -EBUSY;
3702
3703         if (s->state != SERVICE_DEAD)
3704                 return -EAGAIN;
3705
3706         if (getpeername_pretty(fd, &peer) >= 0) {
3707
3708                 if (UNIT(s)->description) {
3709                         _cleanup_free_ char *a;
3710
3711                         a = strjoin(UNIT(s)->description, " (", peer, ")", NULL);
3712                         if (!a)
3713                                 return -ENOMEM;
3714
3715                         r = unit_set_description(UNIT(s), a);
3716                 }  else
3717                         r = unit_set_description(UNIT(s), peer);
3718
3719                 if (r < 0)
3720                         return r;
3721         }
3722
3723         s->socket_fd = fd;
3724
3725         unit_ref_set(&s->accept_socket, UNIT(sock));
3726
3727         return unit_add_two_dependencies(UNIT(sock), UNIT_BEFORE, UNIT_TRIGGERS, UNIT(s), false);
3728 }
3729
3730 static void service_reset_failed(Unit *u) {
3731         Service *s = SERVICE(u);
3732
3733         assert(s);
3734
3735         if (s->state == SERVICE_FAILED)
3736                 service_set_state(s, SERVICE_DEAD);
3737
3738         s->result = SERVICE_SUCCESS;
3739         s->reload_result = SERVICE_SUCCESS;
3740
3741         RATELIMIT_RESET(s->start_limit);
3742 }
3743
3744 static int service_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3745         Service *s = SERVICE(u);
3746
3747         return unit_kill_common(u, who, signo, s->main_pid, s->control_pid, error);
3748 }
3749
3750 static const char* const service_state_table[_SERVICE_STATE_MAX] = {
3751         [SERVICE_DEAD] = "dead",
3752         [SERVICE_START_PRE] = "start-pre",
3753         [SERVICE_START] = "start",
3754         [SERVICE_START_POST] = "start-post",
3755         [SERVICE_RUNNING] = "running",
3756         [SERVICE_EXITED] = "exited",
3757         [SERVICE_RELOAD] = "reload",
3758         [SERVICE_STOP] = "stop",
3759         [SERVICE_STOP_SIGTERM] = "stop-sigterm",
3760         [SERVICE_STOP_SIGKILL] = "stop-sigkill",
3761         [SERVICE_STOP_POST] = "stop-post",
3762         [SERVICE_FINAL_SIGTERM] = "final-sigterm",
3763         [SERVICE_FINAL_SIGKILL] = "final-sigkill",
3764         [SERVICE_FAILED] = "failed",
3765         [SERVICE_AUTO_RESTART] = "auto-restart",
3766 };
3767
3768 DEFINE_STRING_TABLE_LOOKUP(service_state, ServiceState);
3769
3770 static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
3771         [SERVICE_RESTART_NO] = "no",
3772         [SERVICE_RESTART_ON_SUCCESS] = "on-success",
3773         [SERVICE_RESTART_ON_FAILURE] = "on-failure",
3774         [SERVICE_RESTART_ON_WATCHDOG] = "on-watchdog",
3775         [SERVICE_RESTART_ON_ABORT] = "on-abort",
3776         [SERVICE_RESTART_ALWAYS] = "always"
3777 };
3778
3779 DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
3780
3781 static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
3782         [SERVICE_SIMPLE] = "simple",
3783         [SERVICE_FORKING] = "forking",
3784         [SERVICE_ONESHOT] = "oneshot",
3785         [SERVICE_DBUS] = "dbus",
3786         [SERVICE_NOTIFY] = "notify",
3787         [SERVICE_IDLE] = "idle"
3788 };
3789
3790 DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
3791
3792 static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_MAX] = {
3793         [SERVICE_EXEC_START_PRE] = "ExecStartPre",
3794         [SERVICE_EXEC_START] = "ExecStart",
3795         [SERVICE_EXEC_START_POST] = "ExecStartPost",
3796         [SERVICE_EXEC_RELOAD] = "ExecReload",
3797         [SERVICE_EXEC_STOP] = "ExecStop",
3798         [SERVICE_EXEC_STOP_POST] = "ExecStopPost",
3799 };
3800
3801 DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand);
3802
3803 static const char* const notify_access_table[_NOTIFY_ACCESS_MAX] = {
3804         [NOTIFY_NONE] = "none",
3805         [NOTIFY_MAIN] = "main",
3806         [NOTIFY_ALL] = "all"
3807 };
3808
3809 DEFINE_STRING_TABLE_LOOKUP(notify_access, NotifyAccess);
3810
3811 static const char* const service_result_table[_SERVICE_RESULT_MAX] = {
3812         [SERVICE_SUCCESS] = "success",
3813         [SERVICE_FAILURE_RESOURCES] = "resources",
3814         [SERVICE_FAILURE_TIMEOUT] = "timeout",
3815         [SERVICE_FAILURE_EXIT_CODE] = "exit-code",
3816         [SERVICE_FAILURE_SIGNAL] = "signal",
3817         [SERVICE_FAILURE_CORE_DUMP] = "core-dump",
3818         [SERVICE_FAILURE_WATCHDOG] = "watchdog",
3819         [SERVICE_FAILURE_START_LIMIT] = "start-limit"
3820 };
3821
3822 DEFINE_STRING_TABLE_LOOKUP(service_result, ServiceResult);
3823
3824 static const char* const start_limit_action_table[_SERVICE_START_LIMIT_MAX] = {
3825         [SERVICE_START_LIMIT_NONE] = "none",
3826         [SERVICE_START_LIMIT_REBOOT] = "reboot",
3827         [SERVICE_START_LIMIT_REBOOT_FORCE] = "reboot-force",
3828         [SERVICE_START_LIMIT_REBOOT_IMMEDIATE] = "reboot-immediate"
3829 };
3830 DEFINE_STRING_TABLE_LOOKUP(start_limit_action, StartLimitAction);
3831
3832 const UnitVTable service_vtable = {
3833         .object_size = sizeof(Service),
3834         .exec_context_offset = offsetof(Service, exec_context),
3835         .cgroup_context_offset = offsetof(Service, cgroup_context),
3836         .kill_context_offset = offsetof(Service, kill_context),
3837         .exec_runtime_offset = offsetof(Service, exec_runtime),
3838
3839         .sections =
3840                 "Unit\0"
3841                 "Service\0"
3842                 "Install\0",
3843         .private_section = "Service",
3844
3845         .init = service_init,
3846         .done = service_done,
3847         .load = service_load,
3848
3849         .coldplug = service_coldplug,
3850
3851         .dump = service_dump,
3852
3853         .start = service_start,
3854         .stop = service_stop,
3855         .reload = service_reload,
3856
3857         .can_reload = service_can_reload,
3858
3859         .kill = service_kill,
3860
3861         .serialize = service_serialize,
3862         .deserialize_item = service_deserialize_item,
3863
3864         .active_state = service_active_state,
3865         .sub_state_to_string = service_sub_state_to_string,
3866
3867         .check_gc = service_check_gc,
3868         .check_snapshot = service_check_snapshot,
3869
3870         .sigchld_event = service_sigchld_event,
3871
3872         .reset_failed = service_reset_failed,
3873
3874         .notify_cgroup_empty = service_notify_cgroup_empty_event,
3875         .notify_message = service_notify_message,
3876
3877         .bus_name_owner_change = service_bus_name_owner_change,
3878
3879         .bus_interface = "org.freedesktop.systemd1.Service",
3880         .bus_vtable = bus_service_vtable,
3881         .bus_set_property = bus_service_set_property,
3882         .bus_commit_properties = bus_service_commit_properties,
3883
3884         .get_timeout = service_get_timeout,
3885
3886 #ifdef HAVE_SYSV_COMPAT
3887         .enumerate = service_enumerate,
3888 #endif
3889
3890         .can_transient = true,
3891
3892         .status_message_formats = {
3893                 .starting_stopping = {
3894                         [0] = "Starting %s...",
3895                         [1] = "Stopping %s...",
3896                 },
3897                 .finished_start_job = {
3898                         [JOB_DONE]       = "Started %s.",
3899                         [JOB_FAILED]     = "Failed to start %s.",
3900                         [JOB_DEPENDENCY] = "Dependency failed for %s.",
3901                         [JOB_TIMEOUT]    = "Timed out starting %s.",
3902                 },
3903                 .finished_stop_job = {
3904                         [JOB_DONE]       = "Stopped %s.",
3905                         [JOB_FAILED]     = "Stopped (with error) %s.",
3906                         [JOB_TIMEOUT]    = "Timed out stopping %s.",
3907                 },
3908         },
3909 };