service.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU 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
  27 #include "unit.h"
  28 #include "service.h"
  29 #include "load-fragment.h"
  30 #include "load-dropin.h"
  31 #include "log.h"
  32 #include "strv.h"
  33
  34 #define COMMENTS "#;\n"
  35 #define NEWLINES "\n\r"
  36 #define LINE_MAX 4096
  37
  38 static const char * const rcnd_table[] = {
  39         "/rc0.d",  SPECIAL_RUNLEVEL0_TARGET,
  40         "/rc1.d",  SPECIAL_RUNLEVEL1_TARGET,
  41         "/rc2.d",  SPECIAL_RUNLEVEL2_TARGET,
  42         "/rc3.d",  SPECIAL_RUNLEVEL3_TARGET,
  43         "/rc4.d",  SPECIAL_RUNLEVEL4_TARGET,
  44         "/rc5.d",  SPECIAL_RUNLEVEL5_TARGET,
  45         "/rc6.d",  SPECIAL_RUNLEVEL6_TARGET,
  46         "/boot.d", SPECIAL_BASIC_TARGET
  47 };
  48
  49 static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
  50         [SERVICE_DEAD] = UNIT_INACTIVE,
  51         [SERVICE_START_PRE] = UNIT_ACTIVATING,
  52         [SERVICE_START] = UNIT_ACTIVATING,
  53         [SERVICE_START_POST] = UNIT_ACTIVATING,
  54         [SERVICE_RUNNING] = UNIT_ACTIVE,
  55         [SERVICE_EXITED] = UNIT_ACTIVE,
  56         [SERVICE_RELOAD] = UNIT_ACTIVE_RELOADING,
  57         [SERVICE_STOP] = UNIT_DEACTIVATING,
  58         [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
  59         [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
  60         [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
  61         [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  62         [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  63         [SERVICE_MAINTAINANCE] = UNIT_INACTIVE,
  64         [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING,
  65 };
  66
  67 static void service_unwatch_control_pid(Service *s) {
  68         assert(s);
  69
  70         if (s->control_pid <= 0)
  71                 return;
  72
  73         unit_unwatch_pid(UNIT(s), s->control_pid);
  74         s->control_pid = 0;
  75 }
  76
  77 static void service_unwatch_main_pid(Service *s) {
  78         assert(s);
  79
  80         if (s->main_pid <= 0)
  81                 return;
  82
  83         unit_unwatch_pid(UNIT(s), s->main_pid);
  84         s->main_pid = 0;
  85 }
  86
  87 static void service_done(Unit *u) {
  88         Service *s = SERVICE(u);
  89
  90         assert(s);
  91
  92         free(s->pid_file);
  93         s->pid_file = NULL;
  94
  95         free(s->sysv_path);
  96         s->sysv_path = NULL;
  97
  98         free(s->sysv_runlevels);
  99         s->sysv_runlevels = NULL;
 100
 101         exec_context_done(&s->exec_context);
 102         exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
 103         s->control_command = NULL;
 104
 105         /* This will leak a process, but at least no memory or any of
 106          * our resources */
 107         service_unwatch_main_pid(s);
 108         service_unwatch_control_pid(s);
 109
 110         unit_unwatch_timer(u, &s->timer_watch);
 111 }
 112
 113 static int sysv_translate_name(const char *name, char **_r) {
 114
 115         static const char * const table[] = {
 116                 "$local_fs",  SPECIAL_LOCAL_FS_TARGET,
 117                 "$network",   SPECIAL_NETWORK_TARGET,
 118                 "$named",     SPECIAL_NSS_LOOKUP_TARGET,
 119                 "$portmap",   SPECIAL_RPCBIND_TARGET,
 120                 "$remote_fs", SPECIAL_REMOTE_FS_TARGET,
 121                 "$syslog",    SPECIAL_SYSLOG_TARGET,
 122                 "$time",      SPECIAL_RTC_SET_TARGET
 123         };
 124
 125         unsigned i;
 126         char *r;
 127
 128         for (i = 0; i < ELEMENTSOF(table); i += 2)
 129                 if (streq(table[i], name)) {
 130                         if (!(r = strdup(table[i+1])))
 131                                 return -ENOMEM;
 132
 133                         goto finish;
 134                 }
 135
 136         if (*name == '$')
 137                 return 0;
 138
 139         if (asprintf(&r, "%s.service", name) < 0)
 140                 return -ENOMEM;
 141
 142 finish:
 143
 144         if (_r)
 145                 *_r = r;
 146
 147         return 1;
 148 }
 149
 150 static int sysv_chkconfig_order(Service *s) {
 151         Meta *other;
 152         int r;
 153
 154         assert(s);
 155
 156         if (s->sysv_start_priority < 0)
 157                 return 0;
 158
 159         /* For each pair of services where at least one lacks a LSB
 160          * header, we use the start priority value to order things. */
 161
 162         LIST_FOREACH(units_per_type, other, UNIT(s)->meta.manager->units_per_type[UNIT_SERVICE]) {
 163                 Service *t;
 164                 UnitDependency d;
 165
 166                 t = (Service*) other;
 167
 168                 if (s == t)
 169                         continue;
 170
 171                 if (t->sysv_start_priority < 0)
 172                         continue;
 173
 174                 /* If both units have modern headers we don't care
 175                  * about the priorities */
 176                 if ((!s->sysv_path || s->sysv_has_lsb) &&
 177                     (!t->sysv_path || t->sysv_has_lsb))
 178                         continue;
 179
 180                 if (t->sysv_start_priority < s->sysv_start_priority)
 181                         d = UNIT_AFTER;
 182                 else if (t->sysv_start_priority > s->sysv_start_priority)
 183                         d = UNIT_BEFORE;
 184                 else
 185                         continue;
 186
 187                 /* FIXME: Maybe we should compare the name here lexicographically? */
 188
 189                 if (!(r = unit_add_dependency(UNIT(s), d, UNIT(t))) < 0)
 190                         return r;
 191         }
 192
 193         return 0;
 194 }
 195
 196 static ExecCommand *exec_command_new(const char *path, const char *arg1) {
 197         ExecCommand *c;
 198
 199         if (!(c = new0(ExecCommand, 1)))
 200                 return NULL;
 201
 202         if (!(c->path = strdup(path))) {
 203                 free(c);
 204                 return NULL;
 205         }
 206
 207         if (!(c->argv = strv_new(path, arg1, NULL))) {
 208                 free(c->path);
 209                 free(c);
 210                 return NULL;
 211         }
 212
 213         return c;
 214 }
 215
 216 static int sysv_exec_commands(Service *s) {
 217         ExecCommand *c;
 218
 219         assert(s);
 220         assert(s->sysv_path);
 221
 222         if (!(c = exec_command_new(s->sysv_path, "start")))
 223                 return -ENOMEM;
 224         exec_command_append_list(s->exec_command+SERVICE_EXEC_START, c);
 225
 226         if (!(c = exec_command_new(s->sysv_path, "stop")))
 227                 return -ENOMEM;
 228         exec_command_append_list(s->exec_command+SERVICE_EXEC_STOP, c);
 229
 230         if (!(c = exec_command_new(s->sysv_path, "reload")))
 231                 return -ENOMEM;
 232         exec_command_append_list(s->exec_command+SERVICE_EXEC_RELOAD, c);
 233
 234         return 0;
 235 }
 236
 237 static int priority_from_rcd(Service *s, const char *init_script) {
 238         char **p;
 239         unsigned i;
 240
 241         STRV_FOREACH(p, UNIT(s)->meta.manager->sysvrcnd_path)
 242                 for (i = 0; i < ELEMENTSOF(rcnd_table); i += 2) {
 243                         char *path;
 244                         DIR *d;
 245                         struct dirent *de;
 246
 247                         if (asprintf(&path, "%s/%s", *p, rcnd_table[i]) < 0)
 248                                 return -ENOMEM;
 249
 250                         d = opendir(path);
 251                         free(path);
 252
 253                         if (!d) {
 254                                 if (errno != ENOENT)
 255                                         log_warning("opendir() failed on %s: %s", path, strerror(errno));
 256
 257                                 continue;
 258                         }
 259
 260                         while ((de = readdir(d))) {
 261                                 int a, b;
 262
 263                                 if (ignore_file(de->d_name))
 264                                         continue;
 265
 266                                 if (de->d_name[0] != 'S')
 267                                         continue;
 268
 269                                 if (strlen(de->d_name) < 4)
 270                                         continue;
 271
 272                                 if (!streq(de->d_name + 3, init_script))
 273                                         continue;
 274
 275                                 /* Yay, we found it! Now decode the priority */
 276
 277                                 a = undecchar(de->d_name[1]);
 278                                 b = undecchar(de->d_name[2]);
 279
 280                                 if (a < 0 || b < 0)
 281                                         continue;
 282
 283                                 s->sysv_start_priority = a*10 + b;
 284
 285                                 log_debug("Determined priority %i from link farm for %s", s->sysv_start_priority, unit_id(UNIT(s)));
 286
 287                                 closedir(d);
 288                                 return 0;
 289                         }
 290
 291                         closedir(d);
 292                 }
 293
 294         return 0;
 295 }
 296
 297 static int service_load_sysv_path(Service *s, const char *path) {
 298         FILE *f;
 299         Unit *u;
 300         unsigned line = 0;
 301         int r;
 302         enum {
 303                 NORMAL,
 304                 DESCRIPTION,
 305                 LSB,
 306                 LSB_DESCRIPTION
 307         } state = NORMAL;
 308
 309         assert(s);
 310         assert(path);
 311
 312         u = UNIT(s);
 313
 314         if (!(f = fopen(path, "re"))) {
 315                 r = errno == ENOENT ? 0 : -errno;
 316                 goto finish;
 317         }
 318
 319         s->type = SERVICE_FORKING;
 320         s->restart = SERVICE_ONCE;
 321
 322         free(s->sysv_path);
 323         if (!(s->sysv_path = strdup(path))) {
 324                 r = -ENOMEM;
 325                 goto finish;
 326         }
 327
 328         while (!feof(f)) {
 329                 char l[LINE_MAX], *t;
 330
 331                 if (!fgets(l, sizeof(l), f)) {
 332                         if (feof(f))
 333                                 break;
 334
 335                         r = -errno;
 336                         log_error("Failed to read configuration file '%s': %s", path, strerror(-r));
 337                         goto finish;
 338                 }
 339
 340                 line++;
 341
 342                 t = strstrip(l);
 343                 if (*t != '#')
 344                         continue;
 345
 346                 if (state == NORMAL && streq(t, "### BEGIN INIT INFO")) {
 347                         state = LSB;
 348                         s->sysv_has_lsb = true;
 349                         continue;
 350                 }
 351
 352                 if ((state == LSB_DESCRIPTION || state == LSB) && streq(t, "### END INIT INFO")) {
 353                         state = NORMAL;
 354                         continue;
 355                 }
 356
 357                 t++;
 358                 t += strspn(t, WHITESPACE);
 359
 360                 if (state == NORMAL) {
 361
 362                         /* Try to parse Red Hat style chkconfig headers */
 363
 364                         if (startswith(t, "chkconfig:")) {
 365                                 int start_priority;
 366                                 char runlevels[16], *k;
 367
 368                                 state = NORMAL;
 369
 370                                 if (sscanf(t+10, "%15s %i %*i",
 371                                            runlevels,
 372                                            &start_priority) != 2) {
 373
 374                                         log_warning("[%s:%u] Failed to parse chkconfig line. Ignoring.", path, line);
 375                                         continue;
 376                                 }
 377
 378                                 if (start_priority < 0 || start_priority > 99)
 379                                         log_warning("[%s:%u] Start priority out of range. Ignoring.", path, line);
 380                                 else
 381                                         s->sysv_start_priority = start_priority;
 382
 383                                 char_array_0(runlevels);
 384                                 k = delete_chars(runlevels, WHITESPACE "-");
 385
 386                                 if (k[0]) {
 387                                         char *d;
 388
 389                                         if (!(d = strdup(k))) {
 390                                                 r = -ENOMEM;
 391                                                 goto finish;
 392                                         }
 393
 394                                         free(s->sysv_runlevels);
 395                                         s->sysv_runlevels = d;
 396                                 }
 397
 398
 399                         } else if (startswith(t, "description:")) {
 400
 401                                 size_t k = strlen(t);
 402                                 char *d;
 403
 404                                 if (t[k-1] == '\\') {
 405                                         state = DESCRIPTION;
 406                                         t[k-1] = 0;
 407                                 }
 408
 409                                 if (!(d = strdup(strstrip(t+12)))) {
 410                                         r = -ENOMEM;
 411                                         goto finish;
 412                                 }
 413
 414                                 free(u->meta.description);
 415                                 u->meta.description = d;
 416
 417                         } else if (startswith(t, "pidfile:")) {
 418
 419                                 char *fn;
 420
 421                                 state = NORMAL;
 422
 423                                 fn = strstrip(t+8);
 424                                 if (!path_is_absolute(fn)) {
 425                                         log_warning("[%s:%u] PID file not absolute. Ignoring.", path, line);
 426                                         continue;
 427                                 }
 428
 429                                 if (!(fn = strdup(fn))) {
 430                                         r = -ENOMEM;
 431                                         goto finish;
 432                                 }
 433
 434                                 free(s->pid_file);
 435                                 s->pid_file = fn;
 436                         }
 437
 438                 } else if (state == DESCRIPTION) {
 439
 440                         /* Try to parse Red Hat style description
 441                          * continuation */
 442
 443                         size_t k = strlen(t);
 444                         char *d;
 445
 446                         if (t[k-1] == '\\')
 447                                 t[k-1] = 0;
 448                         else
 449                                 state = NORMAL;
 450
 451                         assert(u->meta.description);
 452                         if (asprintf(&d, "%s %s", u->meta.description, strstrip(t)) < 0) {
 453                                 r = -ENOMEM;
 454                                 goto finish;
 455                         }
 456
 457                         free(u->meta.description);
 458                         u->meta.description = d;
 459
 460                 } else if (state == LSB || state == LSB_DESCRIPTION) {
 461
 462                         if (startswith(t, "Provides:")) {
 463                                 char *i, *w;
 464                                 size_t z;
 465
 466                                 state = LSB;
 467
 468                                 FOREACH_WORD(w, z, t+9, i) {
 469                                         char *n, *m;
 470
 471                                         if (!(n = strndup(w, z))) {
 472                                                 r = -ENOMEM;
 473                                                 goto finish;
 474                                         }
 475
 476                                         r = sysv_translate_name(n, &m);
 477                                         free(n);
 478
 479                                         if (r < 0)
 480                                                 goto finish;
 481
 482                                         if (r == 0)
 483                                                 continue;
 484
 485                                         if (unit_name_to_type(m) == UNIT_SERVICE)
 486                                                 r = unit_add_name(u, m);
 487                                         else {
 488                                                 if ((r = unit_add_dependency_by_name_inverse(u, UNIT_REQUIRES, m)) >= 0)
 489                                                         r = unit_add_dependency_by_name(u, UNIT_BEFORE, m);
 490                                         }
 491
 492                                         free(m);
 493
 494                                         if (r < 0)
 495                                                 goto finish;
 496                                 }
 497
 498                         } else if (startswith(t, "Required-Start:") ||
 499                                    startswith(t, "Should-Start:")) {
 500                                 char *i, *w;
 501                                 size_t z;
 502
 503                                 state = LSB;
 504
 505                                 FOREACH_WORD(w, z, strchr(t, ':')+1, i) {
 506                                         char *n, *m;
 507
 508                                         if (!(n = strndup(w, z))) {
 509                                                 r = -ENOMEM;
 510                                                 goto finish;
 511                                         }
 512
 513                                         r = sysv_translate_name(n, &m);
 514                                         free(n);
 515
 516                                         if (r < 0)
 517                                                 goto finish;
 518
 519                                         if (r == 0)
 520                                                 continue;
 521
 522                                         r = unit_add_dependency_by_name(u, UNIT_AFTER, m);
 523                                         free(m);
 524
 525                                         if (r < 0)
 526                                                 goto finish;
 527                                 }
 528                         } else if (startswith(t, "Default-Start:")) {
 529                                 char *k, *d;
 530
 531                                 state = LSB;
 532
 533                                 k = delete_chars(t+14, WHITESPACE "-");
 534
 535                                 if (k[0] != 0) {
 536                                         if (!(d = strdup(k))) {
 537                                                 r = -ENOMEM;
 538                                                 goto finish;
 539                                         }
 540
 541                                         free(s->sysv_runlevels);
 542                                         s->sysv_runlevels = d;
 543                                 }
 544
 545                         } else if (startswith(t, "Description:")) {
 546                                 char *d;
 547
 548                                 state = LSB_DESCRIPTION;
 549
 550                                 if (!(d = strdup(strstrip(t+12)))) {
 551                                         r = -ENOMEM;
 552                                         goto finish;
 553                                 }
 554
 555                                 free(u->meta.description);
 556                                 u->meta.description = d;
 557
 558                         } else if (startswith(t, "Short-Description:") &&
 559                                    !u->meta.description) {
 560                                 char *d;
 561
 562                                 /* We use the short description only
 563                                  * if no long description is set. */
 564
 565                                 state = LSB;
 566
 567                                 if (!(d = strdup(strstrip(t+18)))) {
 568                                         r = -ENOMEM;
 569                                         goto finish;
 570                                 }
 571
 572                                 u->meta.description = d;
 573
 574                         } else if (state == LSB_DESCRIPTION) {
 575
 576                                 if (startswith(l, "#\t") || startswith(l, "#  ")) {
 577                                         char *d;
 578
 579                                         assert(u->meta.description);
 580                                         if (asprintf(&d, "%s %s", u->meta.description, t) < 0) {
 581                                                 r = -ENOMEM;
 582                                                 goto finish;
 583                                         }
 584
 585                                         free(u->meta.description);
 586                                         u->meta.description = d;
 587                                 } else
 588                                         state = LSB;
 589                         }
 590                 }
 591         }
 592
 593         /* If init scripts have no LSB header, then we enforce the
 594          * ordering via the chkconfig priorities. We try to determine
 595          * a priority for *all* init scripts here, since they are
 596          * needed as soon as at least one non-LSB script is used. */
 597
 598         if (s->sysv_start_priority < 0) {
 599                 log_debug("%s has no chkconfig header, trying to determine SysV priority from link farm.", unit_id(u));
 600
 601                 if ((r = priority_from_rcd(s, file_name_from_path(path))) < 0)
 602                         goto finish;
 603
 604                 if (s->sysv_start_priority < 0)
 605                         log_warning("%s has neither a chkconfig header nor a directory link, cannot order unit!", unit_id(u));
 606         }
 607
 608         if ((r = sysv_exec_commands(s)) < 0)
 609                 goto finish;
 610
 611         if (!s->sysv_runlevels || chars_intersect("12345", s->sysv_runlevels)) {
 612                 /* If there a runlevels configured for this service
 613                  * but none of the standard ones, then we assume this
 614                  * is some special kind of service (which might be
 615                  * needed for early boot) and don't create any links
 616                  * to it. */
 617
 618                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_BASIC_TARGET)) < 0 ||
 619                     (r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_BASIC_TARGET)) < 0)
 620                         goto finish;
 621         }
 622
 623         /* Special setting for all SysV services */
 624         s->valid_no_process = true;
 625
 626         /* Don't timeout special services during boot (like fsck) */
 627         if (s->sysv_runlevels && !chars_intersect("12345", s->sysv_runlevels))
 628                 s->timeout_usec = -1;
 629
 630         u->meta.load_state = UNIT_LOADED;
 631         r = 0;
 632
 633 finish:
 634
 635         if (f)
 636                 fclose(f);
 637
 638         return r;
 639 }
 640
 641 static int service_load_sysv_name(Service *s, const char *name) {
 642         char **p;
 643
 644         assert(s);
 645         assert(name);
 646
 647         STRV_FOREACH(p, UNIT(s)->meta.manager->sysvinit_path) {
 648                 char *path;
 649                 int r;
 650
 651                 if (asprintf(&path, "%s/%s", *p, name) < 0)
 652                         return -ENOMEM;
 653
 654                 assert(endswith(path, ".service"));
 655                 path[strlen(path)-8] = 0;
 656
 657                 r = service_load_sysv_path(s, path);
 658                 free(path);
 659
 660                 if (r < 0)
 661                         return r;
 662
 663                 if ((UNIT(s)->meta.load_state != UNIT_STUB))
 664                         break;
 665         }
 666
 667         return 0;
 668 }
 669
 670 static int service_load_sysv(Service *s) {
 671         const char *t;
 672         Iterator i;
 673         int r;
 674
 675         assert(s);
 676
 677         /* Load service data from SysV init scripts, preferably with
 678          * LSB headers ... */
 679
 680         if (strv_isempty(UNIT(s)->meta.manager->sysvinit_path))
 681                 return 0;
 682
 683         if ((t = unit_id(UNIT(s))))
 684                 if ((r = service_load_sysv_name(s, t)) < 0)
 685                         return r;
 686
 687         if (UNIT(s)->meta.load_state == UNIT_STUB)
 688                 SET_FOREACH(t, UNIT(s)->meta.names, i) {
 689                         if (t == unit_id(UNIT(s)))
 690                                 continue;
 691
 692                         if ((r == service_load_sysv_name(s, t)) < 0)
 693                                 return r;
 694
 695                         if (UNIT(s)->meta.load_state != UNIT_STUB)
 696                                 break;
 697                 }
 698
 699         return 0;
 700 }
 701
 702 static void service_init(Unit *u) {
 703         Service *s = SERVICE(u);
 704
 705         assert(u);
 706         assert(u->meta.load_state == UNIT_STUB);
 707
 708         s->type = 0;
 709         s->restart = 0;
 710
 711         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
 712         s->restart_usec = DEFAULT_RESTART_USEC;
 713
 714         exec_context_init(&s->exec_context);
 715
 716         s->timer_watch.type = WATCH_INVALID;
 717
 718         s->state = SERVICE_DEAD;
 719
 720         s->sysv_start_priority = -1;
 721         s->permissions_start_only = false;
 722         s->root_directory_start_only = false;
 723         s->valid_no_process = false;
 724         s->kill_mode = 0;
 725         s->sysv_has_lsb = false;
 726         s->main_pid = s->control_pid = 0;
 727         s->main_pid_known = false;
 728         s->failure = false;
 729
 730         RATELIMIT_INIT(s->ratelimit, 10*USEC_PER_SEC, 5);
 731 }
 732
 733 static int service_verify(Service *s) {
 734         assert(s);
 735
 736         if (UNIT(s)->meta.load_state != UNIT_LOADED)
 737                 return 0;
 738
 739         if (!s->exec_command[SERVICE_EXEC_START]) {
 740                 log_error("%s lacks ExecStart setting. Refusing.", unit_id(UNIT(s)));
 741                 return -EINVAL;
 742         }
 743
 744         return 0;
 745 }
 746
 747 static int service_load(Unit *u) {
 748         int r;
 749         Service *s = SERVICE(u);
 750
 751         assert(s);
 752
 753         /* Load a .service file */
 754         if ((r = unit_load_fragment(u)) < 0)
 755                 return r;
 756
 757         /* Load a classic init script as a fallback, if we couldn't find anything */
 758         if (u->meta.load_state == UNIT_STUB)
 759                 if ((r = service_load_sysv(s)) < 0)
 760                         return r;
 761
 762         /* Still nothing found? Then let's give up */
 763         if (u->meta.load_state == UNIT_STUB)
 764                 return -ENOENT;
 765
 766         /* We were able to load something, then let's add in the
 767          * dropin directories. */
 768         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 769                 return r;
 770
 771         /* This is a new unit? Then let's add in some extras */
 772         if (u->meta.load_state == UNIT_LOADED) {
 773                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 774                         return r;
 775
 776                 if ((r = unit_add_default_cgroup(u)) < 0)
 777                         return r;
 778
 779                 if ((r = sysv_chkconfig_order(s)) < 0)
 780                         return r;
 781         }
 782
 783         return service_verify(s);
 784 }
 785
 786 static void service_dump(Unit *u, FILE *f, const char *prefix) {
 787
 788         ServiceExecCommand c;
 789         Service *s = SERVICE(u);
 790         const char *prefix2;
 791         char *p2;
 792
 793         assert(s);
 794
 795         p2 = strappend(prefix, "\t");
 796         prefix2 = p2 ? p2 : prefix;
 797
 798         fprintf(f,
 799                 "%sService State: %s\n"
 800                 "%sPermissionsStartOnly: %s\n"
 801                 "%sRootDirectoryStartOnly: %s\n"
 802                 "%sValidNoProcess: %s\n"
 803                 "%sKillMode: %s\n"
 804                 "%sType: %s\n",
 805                 prefix, service_state_to_string(s->state),
 806                 prefix, yes_no(s->permissions_start_only),
 807                 prefix, yes_no(s->root_directory_start_only),
 808                 prefix, yes_no(s->valid_no_process),
 809                 prefix, kill_mode_to_string(s->kill_mode),
 810                 prefix, service_type_to_string(s->type));
 811
 812         if (s->control_pid > 0)
 813                 fprintf(f,
 814                         "%sControl PID: %llu\n",
 815                         prefix, (unsigned long long) s->control_pid);
 816
 817         if (s->main_pid > 0)
 818                 fprintf(f,
 819                         "%sMain PID: %llu\n",
 820                         prefix, (unsigned long long) s->main_pid);
 821
 822         if (s->pid_file)
 823                 fprintf(f,
 824                         "%sPIDFile: %s\n",
 825                         prefix, s->pid_file);
 826
 827         exec_context_dump(&s->exec_context, f, prefix);
 828
 829         for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) {
 830
 831                 if (!s->exec_command[c])
 832                         continue;
 833
 834                 fprintf(f, "%s→ %s:\n",
 835                         prefix, service_exec_command_to_string(c));
 836
 837                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 838         }
 839
 840         if (s->sysv_path)
 841                 fprintf(f,
 842                         "%sSysV Init Script Path: %s\n"
 843                         "%sSysV Init Script has LSB Header: %s\n",
 844                         prefix, s->sysv_path,
 845                         prefix, yes_no(s->sysv_has_lsb));
 846
 847         if (s->sysv_start_priority >= 0)
 848                 fprintf(f,
 849                         "%sSysVStartPriority: %i\n",
 850                         prefix, s->sysv_start_priority);
 851
 852         if (s->sysv_runlevels)
 853                 fprintf(f, "%sSysVRunLevels: %s\n",
 854                         prefix, s->sysv_runlevels);
 855
 856         free(p2);
 857 }
 858
 859 static int service_load_pid_file(Service *s) {
 860         char *k;
 861         unsigned long p;
 862         int r;
 863
 864         assert(s);
 865
 866         if (s->main_pid_known)
 867                 return 0;
 868
 869         assert(s->main_pid <= 0);
 870
 871         if (!s->pid_file)
 872                 return -ENOENT;
 873
 874         if ((r = read_one_line_file(s->pid_file, &k)) < 0)
 875                 return r;
 876
 877         if ((r = safe_atolu(k, &p)) < 0) {
 878                 free(k);
 879                 return r;
 880         }
 881
 882         if ((unsigned long) (pid_t) p != p)
 883                 return -ERANGE;
 884
 885         if (kill((pid_t) p, 0) < 0 && errno != EPERM) {
 886                 log_warning("PID %llu read from file %s does not exist. Your service or init script might be broken.",
 887                             (unsigned long long) p, s->pid_file);
 888                 return -ESRCH;
 889         }
 890
 891         if ((r = unit_watch_pid(UNIT(s), (pid_t) p)) < 0)
 892                 /* FIXME: we need to do something here */
 893                 return r;
 894
 895         s->main_pid = (pid_t) p;
 896         s->main_pid_known = true;
 897
 898         return 0;
 899 }
 900
 901 static int service_get_sockets(Service *s, Set **_set) {
 902         Set *set;
 903         Iterator i;
 904         char *t;
 905         int r;
 906
 907         assert(s);
 908         assert(_set);
 909
 910         /* Collects all Socket objects that belong to this
 911          * service. Note that a service might have multiple sockets
 912          * via multiple names. */
 913
 914         if (!(set = set_new(NULL, NULL)))
 915                 return -ENOMEM;
 916
 917         SET_FOREACH(t, UNIT(s)->meta.names, i) {
 918                 char *k;
 919                 Unit *p;
 920
 921                 /* Look for all socket objects that go by any of our
 922                  * units and collect their fds */
 923
 924                 if (!(k = unit_name_change_suffix(t, ".socket"))) {
 925                         r = -ENOMEM;
 926                         goto fail;
 927                 }
 928
 929                 p = manager_get_unit(UNIT(s)->meta.manager, k);
 930                 free(k);
 931
 932                 if (!p) continue;
 933
 934                 if ((r = set_put(set, p)) < 0)
 935                         goto fail;
 936         }
 937
 938         *_set = set;
 939         return 0;
 940
 941 fail:
 942         set_free(set);
 943         return r;
 944 }
 945
 946
 947 static int service_notify_sockets_dead(Service *s) {
 948         Iterator i;
 949         Set *set;
 950         Socket *sock;
 951         int r;
 952
 953         assert(s);
 954
 955         /* Notifies all our sockets when we die */
 956
 957         if ((r = service_get_sockets(s, &set)) < 0)
 958                 return r;
 959
 960         SET_FOREACH(sock, set, i)
 961                 socket_notify_service_dead(sock);
 962
 963         set_free(set);
 964
 965         return 0;
 966 }
 967
 968 static void service_set_state(Service *s, ServiceState state) {
 969         ServiceState old_state;
 970         assert(s);
 971
 972         old_state = s->state;
 973         s->state = state;
 974
 975         if (state != SERVICE_START_PRE &&
 976             state != SERVICE_START &&
 977             state != SERVICE_START_POST &&
 978             state != SERVICE_RELOAD &&
 979             state != SERVICE_STOP &&
 980             state != SERVICE_STOP_SIGTERM &&
 981             state != SERVICE_STOP_SIGKILL &&
 982             state != SERVICE_STOP_POST &&
 983             state != SERVICE_FINAL_SIGTERM &&
 984             state != SERVICE_FINAL_SIGKILL &&
 985             state != SERVICE_AUTO_RESTART)
 986                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 987
 988         if (state != SERVICE_START &&
 989             state != SERVICE_START_POST &&
 990             state != SERVICE_RUNNING &&
 991             state != SERVICE_RELOAD &&
 992             state != SERVICE_STOP &&
 993             state != SERVICE_STOP_SIGTERM &&
 994             state != SERVICE_STOP_SIGKILL)
 995                 service_unwatch_main_pid(s);
 996
 997         if (state != SERVICE_START_PRE &&
 998             state != SERVICE_START &&
 999             state != SERVICE_START_POST &&
1000             state != SERVICE_RELOAD &&
1001             state != SERVICE_STOP &&
1002             state != SERVICE_STOP_SIGTERM &&
1003             state != SERVICE_STOP_SIGKILL &&
1004             state != SERVICE_STOP_POST &&
1005             state != SERVICE_FINAL_SIGTERM &&
1006             state != SERVICE_FINAL_SIGKILL) {
1007                 service_unwatch_control_pid(s);
1008                 s->control_command = NULL;
1009         }
1010
1011         if (state == SERVICE_DEAD ||
1012             state == SERVICE_STOP ||
1013             state == SERVICE_STOP_SIGTERM ||
1014             state == SERVICE_STOP_SIGKILL ||
1015             state == SERVICE_STOP_POST ||
1016             state == SERVICE_FINAL_SIGTERM ||
1017             state == SERVICE_FINAL_SIGKILL ||
1018             state == SERVICE_MAINTAINANCE ||
1019             state == SERVICE_AUTO_RESTART)
1020                 service_notify_sockets_dead(s);
1021
1022         if (old_state != state)
1023                 log_debug("%s changed %s → %s", unit_id(UNIT(s)), service_state_to_string(old_state), service_state_to_string(state));
1024
1025         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
1026 }
1027
1028 static int service_collect_fds(Service *s, int **fds, unsigned *n_fds) {
1029         Iterator i;
1030         int r;
1031         int *rfds = NULL;
1032         unsigned rn_fds = 0;
1033         Set *set;
1034         Socket *sock;
1035
1036         assert(s);
1037         assert(fds);
1038         assert(n_fds);
1039
1040         if ((r = service_get_sockets(s, &set)) < 0)
1041                 return r;
1042
1043         SET_FOREACH(sock, set, i) {
1044                 int *cfds;
1045                 unsigned cn_fds;
1046
1047                 if ((r = socket_collect_fds(sock, &cfds, &cn_fds)) < 0)
1048                         goto fail;
1049
1050                 if (!cfds)
1051                         continue;
1052
1053                 if (!rfds) {
1054                         rfds = cfds;
1055                         rn_fds = cn_fds;
1056                 } else {
1057                         int *t;
1058
1059                         if (!(t = new(int, rn_fds+cn_fds))) {
1060                                 free(cfds);
1061                                 r = -ENOMEM;
1062                                 goto fail;
1063                         }
1064
1065                         memcpy(t, rfds, rn_fds);
1066                         memcpy(t+rn_fds, cfds, cn_fds);
1067                         free(rfds);
1068                         free(cfds);
1069
1070                         rfds = t;
1071                         rn_fds = rn_fds+cn_fds;
1072                 }
1073         }
1074
1075         *fds = rfds;
1076         *n_fds = rn_fds;
1077
1078         set_free(set);
1079
1080         return 0;
1081
1082 fail:
1083         set_free(set);
1084         free(rfds);
1085
1086         return r;
1087 }
1088
1089 static int service_spawn(
1090                 Service *s,
1091                 ExecCommand *c,
1092                 bool timeout,
1093                 bool pass_fds,
1094                 bool apply_permissions,
1095                 bool apply_chroot,
1096                 pid_t *_pid) {
1097
1098         pid_t pid;
1099         int r;
1100         int *fds = NULL;
1101         unsigned n_fds = 0;
1102
1103         assert(s);
1104         assert(c);
1105         assert(_pid);
1106
1107         if (pass_fds)
1108                 if ((r = service_collect_fds(s, &fds, &n_fds)) < 0)
1109                         goto fail;
1110
1111         if (timeout) {
1112                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1113                         goto fail;
1114         } else
1115                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
1116
1117         if ((r = exec_spawn(c,
1118                             &s->exec_context,
1119                             fds, n_fds,
1120                             apply_permissions,
1121                             apply_chroot,
1122                             UNIT(s)->meta.manager->confirm_spawn,
1123                             UNIT(s)->meta.cgroup_bondings,
1124                             &pid)) < 0)
1125                 goto fail;
1126
1127         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
1128                 /* FIXME: we need to do something here */
1129                 goto fail;
1130
1131         free(fds);
1132         *_pid = pid;
1133
1134         return 0;
1135
1136 fail:
1137         free(fds);
1138
1139         if (timeout)
1140                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
1141
1142         return r;
1143 }
1144
1145 static int main_pid_good(Service *s) {
1146         assert(s);
1147
1148         /* Returns 0 if the pid is dead, 1 if it is good, -1 if we
1149          * don't know */
1150
1151         /* If we know the pid file, then lets just check if it is
1152          * still valid */
1153         if (s->main_pid_known)
1154                 return s->main_pid > 0;
1155
1156         /* We don't know the pid */
1157         return -EAGAIN;
1158 }
1159
1160 static int control_pid_good(Service *s) {
1161         assert(s);
1162
1163         return s->control_pid > 0;
1164 }
1165
1166 static int cgroup_good(Service *s) {
1167         int r;
1168
1169         assert(s);
1170
1171         if (s->valid_no_process)
1172                 return -EAGAIN;
1173
1174         if ((r = cgroup_bonding_is_empty_list(UNIT(s)->meta.cgroup_bondings)) < 0)
1175                 return r;
1176
1177         return !r;
1178 }
1179
1180 static void service_enter_dead(Service *s, bool success, bool allow_restart) {
1181         int r;
1182         assert(s);
1183
1184         if (!success)
1185                 s->failure = true;
1186
1187         if (allow_restart &&
1188             (s->restart == SERVICE_RESTART_ALWAYS ||
1189              (s->restart == SERVICE_RESTART_ON_SUCCESS && !s->failure))) {
1190
1191                 if ((r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch)) < 0)
1192                         goto fail;
1193
1194                 service_set_state(s, SERVICE_AUTO_RESTART);
1195         } else
1196                 service_set_state(s, s->failure ? SERVICE_MAINTAINANCE : SERVICE_DEAD);
1197
1198         return;
1199
1200 fail:
1201         log_warning("%s failed to run install restart timer: %s", unit_id(UNIT(s)), strerror(-r));
1202         service_enter_dead(s, false, false);
1203 }
1204
1205 static void service_enter_signal(Service *s, ServiceState state, bool success);
1206
1207 static void service_enter_stop_post(Service *s, bool success) {
1208         int r;
1209         assert(s);
1210
1211         if (!success)
1212                 s->failure = true;
1213
1214         service_unwatch_control_pid(s);
1215
1216         if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST])) {
1217                 if ((r = service_spawn(s,
1218                                        s->control_command,
1219                                        true,
1220                                        false,
1221                                        !s->permissions_start_only,
1222                                        !s->root_directory_start_only,
1223                                        &s->control_pid)) < 0)
1224                         goto fail;
1225
1226
1227                 service_set_state(s, SERVICE_STOP_POST);
1228         } else
1229                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, true);
1230
1231         return;
1232
1233 fail:
1234         log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
1235         service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1236 }
1237
1238 static void service_enter_signal(Service *s, ServiceState state, bool success) {
1239         int r;
1240         bool sent = false;
1241
1242         assert(s);
1243
1244         if (!success)
1245                 s->failure = true;
1246
1247         if (s->kill_mode != KILL_NONE) {
1248                 int sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
1249
1250                 if (s->kill_mode == KILL_CONTROL_GROUP) {
1251
1252                         if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) {
1253                                 if (r != -EAGAIN && r != -ESRCH)
1254                                         goto fail;
1255                         } else
1256                                 sent = true;
1257                 }
1258
1259                 if (!sent) {
1260                         r = 0;
1261
1262                         if (s->main_pid > 0) {
1263                                 if (kill(s->kill_mode == KILL_PROCESS ? s->main_pid : -s->main_pid, sig) < 0 && errno != ESRCH)
1264                                         r = -errno;
1265                                 else
1266                                         sent = true;
1267                         }
1268
1269                         if (s->control_pid > 0) {
1270                                 if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH)
1271                                         r = -errno;
1272                                 else
1273                                         sent = true;
1274                         }
1275
1276                         if (r < 0)
1277                                 goto fail;
1278                 }
1279         }
1280
1281         if (sent) {
1282                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
1283                         goto fail;
1284
1285                 service_set_state(s, state);
1286         } else if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
1287                 service_enter_stop_post(s, true);
1288         else
1289                 service_enter_dead(s, true, true);
1290
1291         return;
1292
1293 fail:
1294         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
1295
1296         if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
1297                 service_enter_stop_post(s, false);
1298         else
1299                 service_enter_dead(s, false, true);
1300 }
1301
1302 static void service_enter_stop(Service *s, bool success) {
1303         int r;
1304         assert(s);
1305
1306         if (!success)
1307                 s->failure = true;
1308
1309         service_unwatch_control_pid(s);
1310
1311         if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP])) {
1312                 if ((r = service_spawn(s,
1313                                        s->control_command,
1314                                        true,
1315                                        false,
1316                                        !s->permissions_start_only,
1317                                        !s->root_directory_start_only,
1318                                        &s->control_pid)) < 0)
1319                         goto fail;
1320
1321                 service_set_state(s, SERVICE_STOP);
1322         } else
1323                 service_enter_signal(s, SERVICE_STOP_SIGTERM, true);
1324
1325         return;
1326
1327 fail:
1328         log_warning("%s failed to run stop executable: %s", unit_id(UNIT(s)), strerror(-r));
1329         service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
1330 }
1331
1332 static void service_enter_running(Service *s, bool success) {
1333         assert(s);
1334
1335         if (!success)
1336                 s->failure = true;
1337
1338         if (main_pid_good(s) != 0 && cgroup_good(s) != 0)
1339                 service_set_state(s, SERVICE_RUNNING);
1340         else if (s->valid_no_process)
1341                 service_set_state(s, SERVICE_EXITED);
1342         else
1343                 service_enter_stop(s, true);
1344 }
1345
1346 static void service_enter_start_post(Service *s) {
1347         int r;
1348         assert(s);
1349
1350         service_unwatch_control_pid(s);
1351
1352         if ((s->control_command = s->exec_command[SERVICE_EXEC_START_POST])) {
1353                 if ((r = service_spawn(s,
1354                                        s->control_command,
1355                                        true,
1356                                        false,
1357                                        !s->permissions_start_only,
1358                                        !s->root_directory_start_only,
1359                                        &s->control_pid)) < 0)
1360                         goto fail;
1361
1362
1363                 service_set_state(s, SERVICE_START_POST);
1364         } else
1365                 service_enter_running(s, true);
1366
1367         return;
1368
1369 fail:
1370         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
1371         service_enter_stop(s, false);
1372 }
1373
1374 static void service_enter_start(Service *s) {
1375         pid_t pid;
1376         int r;
1377
1378         assert(s);
1379
1380         assert(s->exec_command[SERVICE_EXEC_START]);
1381         assert(!s->exec_command[SERVICE_EXEC_START]->command_next);
1382
1383         if (s->type == SERVICE_FORKING)
1384                 service_unwatch_control_pid(s);
1385         else
1386                 service_unwatch_main_pid(s);
1387
1388         if ((r = service_spawn(s,
1389                                s->exec_command[SERVICE_EXEC_START],
1390                                s->type == SERVICE_FORKING,
1391                                true,
1392                                true,
1393                                true,
1394                                &pid)) < 0)
1395                 goto fail;
1396
1397         if (s->type == SERVICE_SIMPLE) {
1398                 /* For simple services we immediately start
1399                  * the START_POST binaries. */
1400
1401                 s->main_pid = pid;
1402                 s->main_pid_known = true;
1403
1404                 service_enter_start_post(s);
1405
1406         } else  if (s->type == SERVICE_FORKING) {
1407
1408                 /* For forking services we wait until the start
1409                  * process exited. */
1410
1411                 s->control_pid = pid;
1412
1413                 s->control_command = s->exec_command[SERVICE_EXEC_START];
1414                 service_set_state(s, SERVICE_START);
1415
1416         } else if (s->type == SERVICE_FINISH) {
1417
1418                 /* For finishing services we wait until the start
1419                  * process exited, too, but it is our main process. */
1420
1421                 s->main_pid = pid;
1422                 s->main_pid_known = true;
1423
1424                 s->control_command = s->exec_command[SERVICE_EXEC_START];
1425                 service_set_state(s, SERVICE_START);
1426         } else
1427                 assert_not_reached("Unknown service type");
1428
1429         return;
1430
1431 fail:
1432         log_warning("%s failed to run start exectuable: %s", unit_id(UNIT(s)), strerror(-r));
1433         service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1434 }
1435
1436 static void service_enter_start_pre(Service *s) {
1437         int r;
1438
1439         assert(s);
1440
1441         service_unwatch_control_pid(s);
1442
1443         if ((s->control_command = s->exec_command[SERVICE_EXEC_START_PRE])) {
1444                 if ((r = service_spawn(s,
1445                                        s->control_command,
1446                                        true,
1447                                        false,
1448                                        !s->permissions_start_only,
1449                                        !s->root_directory_start_only,
1450                                        &s->control_pid)) < 0)
1451                         goto fail;
1452
1453                 service_set_state(s, SERVICE_START_PRE);
1454         } else
1455                 service_enter_start(s);
1456
1457         return;
1458
1459 fail:
1460         log_warning("%s failed to run start-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
1461         service_enter_dead(s, false, true);
1462 }
1463
1464 static void service_enter_restart(Service *s) {
1465         int r;
1466         assert(s);
1467
1468         service_enter_dead(s, true, false);
1469
1470         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s), JOB_FAIL, false, NULL)) < 0)
1471                 goto fail;
1472
1473         log_debug("%s scheduled restart job.", unit_id(UNIT(s)));
1474         return;
1475
1476 fail:
1477
1478         log_warning("%s failed to schedule restart job: %s", unit_id(UNIT(s)), strerror(-r));
1479         service_enter_dead(s, false, false);
1480 }
1481
1482 static void service_enter_reload(Service *s) {
1483         int r;
1484
1485         assert(s);
1486
1487         service_unwatch_control_pid(s);
1488
1489         if ((s->control_command = s->exec_command[SERVICE_EXEC_RELOAD])) {
1490                 if ((r = service_spawn(s,
1491                                        s->control_command,
1492                                        true,
1493                                        false,
1494                                        !s->permissions_start_only,
1495                                        !s->root_directory_start_only,
1496                                        &s->control_pid)) < 0)
1497                         goto fail;
1498
1499                 service_set_state(s, SERVICE_RELOAD);
1500         } else
1501                 service_enter_running(s, true);
1502
1503         return;
1504
1505 fail:
1506         log_warning("%s failed to run reload executable: %s", unit_id(UNIT(s)), strerror(-r));
1507         service_enter_stop(s, false);
1508 }
1509
1510 static void service_run_next(Service *s, bool success) {
1511         int r;
1512
1513         assert(s);
1514         assert(s->control_command);
1515         assert(s->control_command->command_next);
1516
1517         if (!success)
1518                 s->failure = true;
1519
1520         s->control_command = s->control_command->command_next;
1521
1522         service_unwatch_control_pid(s);
1523
1524         if ((r = service_spawn(s,
1525                                s->control_command,
1526                                true,
1527                                false,
1528                                !s->permissions_start_only,
1529                                !s->root_directory_start_only,
1530                                &s->control_pid)) < 0)
1531                 goto fail;
1532
1533         return;
1534
1535 fail:
1536         log_warning("%s failed to run spawn next executable: %s", unit_id(UNIT(s)), strerror(-r));
1537
1538         if (s->state == SERVICE_START_PRE)
1539                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1540         else if (s->state == SERVICE_STOP)
1541                 service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
1542         else if (s->state == SERVICE_STOP_POST)
1543                 service_enter_dead(s, false, true);
1544         else
1545                 service_enter_stop(s, false);
1546 }
1547
1548 static int service_start(Unit *u) {
1549         Service *s = SERVICE(u);
1550
1551         assert(s);
1552
1553         /* We cannot fulfill this request right now, try again later
1554          * please! */
1555         if (s->state == SERVICE_STOP ||
1556             s->state == SERVICE_STOP_SIGTERM ||
1557             s->state == SERVICE_STOP_SIGKILL ||
1558             s->state == SERVICE_STOP_POST ||
1559             s->state == SERVICE_FINAL_SIGTERM ||
1560             s->state == SERVICE_FINAL_SIGKILL)
1561                 return -EAGAIN;
1562
1563         /* Already on it! */
1564         if (s->state == SERVICE_START_PRE ||
1565             s->state == SERVICE_START ||
1566             s->state == SERVICE_START_POST)
1567                 return 0;
1568
1569         assert(s->state == SERVICE_DEAD || s->state == SERVICE_MAINTAINANCE || s->state == SERVICE_AUTO_RESTART);
1570
1571         /* Make sure we don't enter a busy loop of some kind. */
1572         if (!ratelimit_test(&s->ratelimit)) {
1573                 log_warning("%s start request repeated too quickly, refusing to start.", unit_id(u));
1574                 return -EAGAIN;
1575         }
1576
1577         s->failure = false;
1578         s->main_pid_known = false;
1579
1580         service_enter_start_pre(s);
1581         return 0;
1582 }
1583
1584 static int service_stop(Unit *u) {
1585         Service *s = SERVICE(u);
1586
1587         assert(s);
1588
1589         /* Cannot do this now */
1590         if (s->state == SERVICE_START_PRE ||
1591             s->state == SERVICE_START ||
1592             s->state == SERVICE_START_POST ||
1593             s->state == SERVICE_RELOAD)
1594                 return -EAGAIN;
1595
1596         /* Already on it */
1597         if (s->state == SERVICE_STOP ||
1598             s->state == SERVICE_STOP_SIGTERM ||
1599             s->state == SERVICE_STOP_SIGKILL ||
1600             s->state == SERVICE_STOP_POST ||
1601             s->state == SERVICE_FINAL_SIGTERM ||
1602             s->state == SERVICE_FINAL_SIGKILL)
1603                 return 0;
1604
1605         if (s->state == SERVICE_AUTO_RESTART) {
1606                 service_set_state(s, SERVICE_DEAD);
1607                 return 0;
1608         }
1609
1610         assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
1611
1612         service_enter_stop(s, true);
1613         return 0;
1614 }
1615
1616 static int service_reload(Unit *u) {
1617         Service *s = SERVICE(u);
1618
1619         assert(s);
1620
1621         assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
1622
1623         service_enter_reload(s);
1624         return 0;
1625 }
1626
1627 static bool service_can_reload(Unit *u) {
1628         Service *s = SERVICE(u);
1629
1630         assert(s);
1631
1632         return !!s->exec_command[SERVICE_EXEC_RELOAD];
1633 }
1634
1635 static UnitActiveState service_active_state(Unit *u) {
1636         assert(u);
1637
1638         return state_translation_table[SERVICE(u)->state];
1639 }
1640
1641 static const char *service_sub_state_to_string(Unit *u) {
1642         assert(u);
1643
1644         return service_state_to_string(SERVICE(u)->state);
1645 }
1646
1647 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1648         Service *s = SERVICE(u);
1649         bool success;
1650
1651         assert(s);
1652         assert(pid >= 0);
1653
1654         success = code == CLD_EXITED && status == 0;
1655         s->failure = s->failure || !success;
1656
1657         if (s->main_pid == pid) {
1658
1659                 exec_status_fill(&s->main_exec_status, pid, code, status);
1660                 s->main_pid = 0;
1661
1662                 if (s->type == SERVICE_SIMPLE || s->type == SERVICE_FINISH) {
1663                         assert(s->exec_command[SERVICE_EXEC_START]);
1664                         s->exec_command[SERVICE_EXEC_START]->exec_status = s->main_exec_status;
1665                 }
1666
1667                 log_debug("%s: main process exited, code=%s, status=%i", unit_id(u), sigchld_code_to_string(code), status);
1668
1669                 /* The service exited, so the service is officially
1670                  * gone. */
1671
1672                 switch (s->state) {
1673
1674                 case SERVICE_START_POST:
1675                 case SERVICE_RELOAD:
1676                 case SERVICE_STOP:
1677                         /* Need to wait until the operation is
1678                          * done */
1679                         break;
1680
1681                 case SERVICE_START:
1682                         assert(s->type == SERVICE_FINISH);
1683
1684                         /* This was our main goal, so let's go on */
1685                         if (success)
1686                                 service_enter_start_post(s);
1687                         else
1688                                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1689                         break;
1690
1691                 case SERVICE_RUNNING:
1692                         service_enter_running(s, success);
1693                         break;
1694
1695                 case SERVICE_STOP_SIGTERM:
1696                 case SERVICE_STOP_SIGKILL:
1697
1698                         if (!control_pid_good(s))
1699                                 service_enter_stop_post(s, success);
1700
1701                         /* If there is still a control process, wait for that first */
1702                         break;
1703
1704                 default:
1705                         assert_not_reached("Uh, main process died at wrong time.");
1706                 }
1707
1708         } else if (s->control_pid == pid) {
1709                 assert(s->control_command);
1710
1711                 exec_status_fill(&s->control_command->exec_status, pid, code, status);
1712                 s->control_pid = 0;
1713
1714                 log_debug("%s: control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
1715
1716                 /* If we are shutting things down anyway we
1717                  * don't care about failing commands. */
1718
1719                 if (s->control_command->command_next && success) {
1720
1721                         /* There is another command to *
1722                          * execute, so let's do that. */
1723
1724                         log_debug("%s running next command for state %s", unit_id(u), service_state_to_string(s->state));
1725                         service_run_next(s, success);
1726
1727                 } else {
1728                         /* No further commands for this step, so let's
1729                          * figure out what to do next */
1730
1731                         log_debug("%s got final SIGCHLD for state %s", unit_id(u), service_state_to_string(s->state));
1732
1733                         switch (s->state) {
1734
1735                         case SERVICE_START_PRE:
1736                                 if (success)
1737                                         service_enter_start(s);
1738                                 else
1739                                         service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1740                                 break;
1741
1742                         case SERVICE_START:
1743                                 assert(s->type == SERVICE_FORKING);
1744
1745                                 /* Let's try to load the pid
1746                                  * file here if we can. We
1747                                  * ignore the return value,
1748                                  * since the PID file might
1749                                  * actually be created by a
1750                                  * START_POST script */
1751
1752                                 if (success) {
1753                                         if (s->pid_file)
1754                                                 service_load_pid_file(s);
1755
1756                                         service_enter_start_post(s);
1757                                 } else
1758                                         service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1759
1760                                 break;
1761
1762                         case SERVICE_START_POST:
1763                                 if (success && s->pid_file && !s->main_pid_known) {
1764                                         int r;
1765
1766                                         /* Hmm, let's see if we can
1767                                          * load the pid now after the
1768                                          * start-post scripts got
1769                                          * executed. */
1770
1771                                         if ((r = service_load_pid_file(s)) < 0)
1772                                                 log_warning("%s: failed to load PID file %s: %s", unit_id(UNIT(s)), s->pid_file, strerror(-r));
1773                                 }
1774
1775                                 /* Fall through */
1776
1777                         case SERVICE_RELOAD:
1778                                 if (success)
1779                                         service_enter_running(s, true);
1780                                 else
1781                                         service_enter_stop(s, false);
1782
1783                                 break;
1784
1785                         case SERVICE_STOP:
1786                                 service_enter_signal(s, SERVICE_STOP_SIGTERM, success);
1787                                 break;
1788
1789                         case SERVICE_STOP_SIGTERM:
1790                         case SERVICE_STOP_SIGKILL:
1791                                 if (main_pid_good(s) <= 0)
1792                                         service_enter_stop_post(s, success);
1793
1794                                 /* If there is still a service
1795                                  * process around, wait until
1796                                  * that one quit, too */
1797                                 break;
1798
1799                         case SERVICE_STOP_POST:
1800                         case SERVICE_FINAL_SIGTERM:
1801                         case SERVICE_FINAL_SIGKILL:
1802                                 service_enter_dead(s, success, true);
1803                                 break;
1804
1805                         default:
1806                                 assert_not_reached("Uh, control process died at wrong time.");
1807                         }
1808                 }
1809         } else
1810                 assert_not_reached("Got SIGCHLD for unkown PID");
1811 }
1812
1813 static void service_timer_event(Unit *u, uint64_t elapsed, Watch* w) {
1814         Service *s = SERVICE(u);
1815
1816         assert(s);
1817         assert(elapsed == 1);
1818
1819         assert(w == &s->timer_watch);
1820
1821         switch (s->state) {
1822
1823         case SERVICE_START_PRE:
1824         case SERVICE_START:
1825                 log_warning("%s operation timed out. Terminating.", unit_id(u));
1826                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1827                 break;
1828
1829         case SERVICE_START_POST:
1830         case SERVICE_RELOAD:
1831                 log_warning("%s operation timed out. Stopping.", unit_id(u));
1832                 service_enter_stop(s, false);
1833                 break;
1834
1835         case SERVICE_STOP:
1836                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
1837                 service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
1838                 break;
1839
1840         case SERVICE_STOP_SIGTERM:
1841                 log_warning("%s stopping timed out. Killing.", unit_id(u));
1842                 service_enter_signal(s, SERVICE_STOP_SIGKILL, false);
1843                 break;
1844
1845         case SERVICE_STOP_SIGKILL:
1846                 /* Uh, wie sent a SIGKILL and it is still not gone?
1847                  * Must be something we cannot kill, so let's just be
1848                  * weirded out and continue */
1849
1850                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
1851                 service_enter_stop_post(s, false);
1852                 break;
1853
1854         case SERVICE_STOP_POST:
1855                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
1856                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1857                 break;
1858
1859         case SERVICE_FINAL_SIGTERM:
1860                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
1861                 service_enter_signal(s, SERVICE_FINAL_SIGKILL, false);
1862                 break;
1863
1864         case SERVICE_FINAL_SIGKILL:
1865                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
1866                 service_enter_dead(s, false, true);
1867                 break;
1868
1869         case SERVICE_AUTO_RESTART:
1870                 log_debug("%s holdoff time over, scheduling restart.", unit_id(u));
1871                 service_enter_restart(s);
1872                 break;
1873
1874         default:
1875                 assert_not_reached("Timeout at wrong time.");
1876         }
1877 }
1878
1879 static void service_cgroup_notify_event(Unit *u) {
1880         Service *s = SERVICE(u);
1881
1882         assert(u);
1883
1884         log_debug("%s: cgroup is empty", unit_id(u));
1885
1886         switch (s->state) {
1887
1888                 /* Waiting for SIGCHLD is usually more interesting,
1889                  * because it includes return codes/signals. Which is
1890                  * why we ignore the cgroup events for most cases,
1891                  * except when we don't know pid which to expect the
1892                  * SIGCHLD for. */
1893
1894         case SERVICE_RUNNING:
1895                 service_enter_running(s, true);
1896                 break;
1897
1898         default:
1899                 ;
1900         }
1901 }
1902
1903 static int service_enumerate(Manager *m) {
1904         char **p;
1905         unsigned i;
1906         DIR *d = NULL;
1907         char *path = NULL, *fpath = NULL, *name = NULL;
1908         int r;
1909
1910         assert(m);
1911
1912         STRV_FOREACH(p, m->sysvrcnd_path)
1913                 for (i = 0; i < ELEMENTSOF(rcnd_table); i += 2) {
1914                         struct dirent *de;
1915
1916                         free(path);
1917                         path = NULL;
1918                         if (asprintf(&path, "%s/%s", *p, rcnd_table[i]) < 0) {
1919                                 r = -ENOMEM;
1920                                 goto finish;
1921                         }
1922
1923                         if (d)
1924                                 closedir(d);
1925
1926                         if (!(d = opendir(path))) {
1927                                 if (errno != ENOENT)
1928                                         log_warning("opendir() failed on %s: %s", path, strerror(errno));
1929
1930                                 continue;
1931                         }
1932
1933                         while ((de = readdir(d))) {
1934                                 Unit *runlevel, *service;
1935
1936                                 if (ignore_file(de->d_name))
1937                                         continue;
1938
1939                                 if (de->d_name[0] != 'S' && de->d_name[0] != 'K')
1940                                         continue;
1941
1942                                 if (strlen(de->d_name) < 4)
1943                                         continue;
1944
1945                                 free(fpath);
1946                                 fpath = NULL;
1947                                 if (asprintf(&fpath, "%s/%s/%s", *p, rcnd_table[i], de->d_name) < 0) {
1948                                         r = -ENOMEM;
1949                                         goto finish;
1950                                 }
1951
1952                                 if (access(fpath, X_OK) < 0) {
1953
1954                                         if (errno != ENOENT)
1955                                                 log_warning("access() failed on %s: %s", fpath, strerror(errno));
1956
1957                                         continue;
1958                                 }
1959
1960                                 free(name);
1961                                 name = NULL;
1962                                 if (asprintf(&name, "%s.service", de->d_name+3) < 0) {
1963                                         r = -ENOMEM;
1964                                         goto finish;
1965                                 }
1966
1967                                 if ((r = manager_load_unit(m, name, &service)) < 0)
1968                                         goto finish;
1969
1970                                 if ((r = manager_load_unit(m, rcnd_table[i+1], &runlevel)) < 0)
1971                                         goto finish;
1972
1973                                 if (de->d_name[0] == 'S') {
1974                                         if ((r = unit_add_dependency(runlevel, UNIT_WANTS, service)) < 0)
1975                                                 goto finish;
1976
1977                                         if ((r = unit_add_dependency(runlevel, UNIT_AFTER, service)) < 0)
1978                                                 goto finish;
1979
1980                                 } else if (de->d_name[0] == 'K' &&
1981                                            (streq(rcnd_table[i+1], SPECIAL_RUNLEVEL0_TARGET) ||
1982                                             streq(rcnd_table[i+1], SPECIAL_RUNLEVEL6_TARGET))) {
1983
1984                                         /* We honour K links only for
1985                                          * halt/reboot. For the normal
1986                                          * runlevels we assume the
1987                                          * stop jobs will be
1988                                          * implicitly added by the
1989                                          * core logic. */
1990
1991                                         if ((r = unit_add_dependency(runlevel, UNIT_CONFLICTS, service)) < 0)
1992                                                 goto finish;
1993
1994                                         if ((r = unit_add_dependency(runlevel, UNIT_BEFORE, service)) < 0)
1995                                                 goto finish;
1996                                 }
1997                         }
1998                 }
1999
2000         r = 0;
2001
2002 finish:
2003         free(path);
2004         free(fpath);
2005         free(name);
2006         closedir(d);
2007
2008         return r;
2009 }
2010
2011 static const char* const service_state_table[_SERVICE_STATE_MAX] = {
2012         [SERVICE_DEAD] = "dead",
2013         [SERVICE_START_PRE] = "start-pre",
2014         [SERVICE_START] = "start",
2015         [SERVICE_START_POST] = "start-post",
2016         [SERVICE_RUNNING] = "running",
2017         [SERVICE_EXITED] = "exited",
2018         [SERVICE_RELOAD] = "reload",
2019         [SERVICE_STOP] = "stop",
2020         [SERVICE_STOP_SIGTERM] = "stop-sigterm",
2021         [SERVICE_STOP_SIGKILL] = "stop-sigkill",
2022         [SERVICE_STOP_POST] = "stop-post",
2023         [SERVICE_FINAL_SIGTERM] = "final-sigterm",
2024         [SERVICE_FINAL_SIGKILL] = "final-sigkill",
2025         [SERVICE_MAINTAINANCE] = "maintainance",
2026         [SERVICE_AUTO_RESTART] = "auto-restart",
2027 };
2028
2029 DEFINE_STRING_TABLE_LOOKUP(service_state, ServiceState);
2030
2031 static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
2032         [SERVICE_ONCE] = "once",
2033         [SERVICE_RESTART_ON_SUCCESS] = "restart-on-success",
2034         [SERVICE_RESTART_ALWAYS] = "restart-always",
2035 };
2036
2037 DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
2038
2039 static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
2040         [SERVICE_FORKING] = "forking",
2041         [SERVICE_SIMPLE] = "simple",
2042         [SERVICE_FINISH] = "finish"
2043 };
2044
2045 DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
2046
2047 static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_MAX] = {
2048         [SERVICE_EXEC_START_PRE] = "ExecStartPre",
2049         [SERVICE_EXEC_START] = "ExecStart",
2050         [SERVICE_EXEC_START_POST] = "ExecStartPost",
2051         [SERVICE_EXEC_RELOAD] = "ExecReload",
2052         [SERVICE_EXEC_STOP] = "ExecStop",
2053         [SERVICE_EXEC_STOP_POST] = "ExecStopPost",
2054 };
2055
2056 DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand);
2057
2058 const UnitVTable service_vtable = {
2059         .suffix = ".service",
2060
2061         .init = service_init,
2062         .load = service_load,
2063         .done = service_done,
2064
2065         .dump = service_dump,
2066
2067         .start = service_start,
2068         .stop = service_stop,
2069         .reload = service_reload,
2070
2071         .can_reload = service_can_reload,
2072
2073         .active_state = service_active_state,
2074         .sub_state_to_string = service_sub_state_to_string,
2075
2076         .sigchld_event = service_sigchld_event,
2077         .timer_event = service_timer_event,
2078
2079         .cgroup_notify_empty = service_cgroup_notify_event,
2080
2081         .enumerate = service_enumerate
2082 };