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
  25 #include "unit.h"
  26 #include "service.h"
  27 #include "load-fragment.h"
  28 #include "load-dropin.h"
  29 #include "log.h"
  30
  31 static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
  32         [SERVICE_DEAD] = UNIT_INACTIVE,
  33         [SERVICE_START_PRE] = UNIT_ACTIVATING,
  34         [SERVICE_START] = UNIT_ACTIVATING,
  35         [SERVICE_START_POST] = UNIT_ACTIVATING,
  36         [SERVICE_RUNNING] = UNIT_ACTIVE,
  37         [SERVICE_RELOAD] = UNIT_ACTIVE_RELOADING,
  38         [SERVICE_STOP] = UNIT_DEACTIVATING,
  39         [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
  40         [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
  41         [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
  42         [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  43         [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  44         [SERVICE_MAINTAINANCE] = UNIT_INACTIVE,
  45         [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING,
  46 };
  47
  48 static void service_done(Unit *u) {
  49         Service *s = SERVICE(u);
  50
  51         assert(s);
  52
  53         free(s->pid_file);
  54         s->pid_file = NULL;
  55
  56         exec_context_done(&s->exec_context);
  57         exec_command_free_array(s->exec_command, _SERVICE_EXEC_MAX);
  58         s->control_command = NULL;
  59
  60         /* This will leak a process, but at least no memory or any of
  61          * our resources */
  62         if (s->main_pid > 0) {
  63                 unit_unwatch_pid(u, s->main_pid);
  64                 s->main_pid = 0;
  65         }
  66
  67         if (s->control_pid > 0) {
  68                 unit_unwatch_pid(u, s->control_pid);
  69                 s->control_pid = 0;
  70         }
  71
  72         unit_unwatch_timer(u, &s->timer_watch);
  73 }
  74
  75 static int service_load_sysv(Service *s) {
  76         assert(s);
  77
  78         /* Load service data from SysV init scripts, preferably with
  79          * LSB headers ... */
  80
  81         return -ENOENT;
  82 }
  83
  84 static int service_init(Unit *u) {
  85         int r;
  86         Service *s = SERVICE(u);
  87
  88         assert(s);
  89
  90         /* First, reset everything to the defaults, in case this is a
  91          * reload */
  92
  93         s->type = 0;
  94         s->restart = 0;
  95
  96         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  97         s->restart_usec = DEFAULT_RESTART_USEC;
  98
  99         exec_context_init(&s->exec_context);
 100
 101         s->timer_watch.type = WATCH_INVALID;
 102
 103         s->state = SERVICE_DEAD;
 104
 105         RATELIMIT_INIT(s->ratelimit, 10*USEC_PER_SEC, 5);
 106
 107         /* Load a .service file */
 108         if ((r = unit_load_fragment(u)) < 0) {
 109                 service_done(u);
 110                 return r;
 111         }
 112
 113         /* Load a classic init script as a fallback, if we couldn*t find anything */
 114         if (r == 0)
 115                 if ((r = service_load_sysv(s)) <= 0) {
 116                         service_done(u);
 117                         return r < 0 ? r : -ENOENT;
 118                 }
 119
 120         /* Load dropin directory data */
 121         if ((r = unit_load_dropin(u)) < 0) {
 122                 service_done(u);
 123                 return r;
 124         }
 125
 126         return 0;
 127 }
 128
 129 static void service_dump(Unit *u, FILE *f, const char *prefix) {
 130
 131         ServiceExecCommand c;
 132         Service *s = SERVICE(u);
 133         const char *prefix2;
 134         char *p2;
 135
 136         assert(s);
 137
 138         p2 = strappend(prefix, "\t");
 139         prefix2 = p2 ? p2 : prefix;
 140
 141         fprintf(f,
 142                 "%sService State: %s\n",
 143                 prefix, service_state_to_string(s->state));
 144
 145         if (s->pid_file)
 146                 fprintf(f,
 147                         "%sPIDFile: %s\n",
 148                         prefix, s->pid_file);
 149
 150
 151         exec_context_dump(&s->exec_context, f, prefix);
 152
 153         for (c = 0; c < _SERVICE_EXEC_MAX; c++) {
 154
 155                 if (!s->exec_command[c])
 156                         continue;
 157
 158                 fprintf(f, "%s→ %s:\n",
 159                         prefix, service_exec_command_to_string(c));
 160
 161                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 162         }
 163
 164         free(p2);
 165 }
 166
 167 static int service_load_pid_file(Service *s) {
 168         char *k;
 169         unsigned long p;
 170         int r;
 171
 172         assert(s);
 173
 174         if (s->main_pid_known)
 175                 return 0;
 176
 177         if (!s->pid_file)
 178                 return -ENOENT;
 179
 180         if ((r = read_one_line_file(s->pid_file, &k)) < 0)
 181                 return r;
 182
 183         if ((r = safe_atolu(k, &p)) < 0) {
 184                 free(k);
 185                 return r;
 186         }
 187
 188         if ((unsigned long) (pid_t) p != p)
 189                 return -ERANGE;
 190
 191         s->main_pid = p;
 192         s->main_pid_known = true;
 193
 194         return 0;
 195 }
 196
 197 static int service_get_sockets(Service *s, Set **_set) {
 198         Set *set;
 199         Iterator i;
 200         char *t;
 201         int r;
 202
 203         assert(s);
 204         assert(_set);
 205
 206         /* Collects all Socket objects that belong to this
 207          * service. Note that a service might have multiple sockets
 208          * via multiple names. */
 209
 210         if (!(set = set_new(NULL, NULL)))
 211                 return -ENOMEM;
 212
 213         SET_FOREACH(t, UNIT(s)->meta.names, i) {
 214                 char *k;
 215                 Unit *p;
 216
 217                 /* Look for all socket objects that go by any of our
 218                  * units and collect their fds */
 219
 220                 if (!(k = unit_name_change_suffix(t, ".socket"))) {
 221                         r = -ENOMEM;
 222                         goto fail;
 223                 }
 224
 225                 p = manager_get_unit(UNIT(s)->meta.manager, k);
 226                 free(k);
 227
 228                 if (!p) continue;
 229
 230                 if ((r = set_put(set, p)) < 0)
 231                         goto fail;
 232         }
 233
 234         *_set = set;
 235         return 0;
 236
 237 fail:
 238         set_free(set);
 239         return r;
 240 }
 241
 242
 243 static int service_notify_sockets(Service *s) {
 244         Iterator i;
 245         Set *set;
 246         Socket *sock;
 247         int r;
 248
 249         assert(s);
 250
 251         /* Notifies all our sockets when we die */
 252
 253         if ((r = service_get_sockets(s, &set)) < 0)
 254                 return r;
 255
 256         SET_FOREACH(sock, set, i)
 257                 socket_notify_service_dead(sock);
 258
 259         set_free(set);
 260
 261         return 0;
 262 }
 263
 264 static void service_set_state(Service *s, ServiceState state) {
 265         ServiceState old_state;
 266         assert(s);
 267
 268         old_state = s->state;
 269         s->state = state;
 270
 271         if (state != SERVICE_START_PRE &&
 272             state != SERVICE_START &&
 273             state != SERVICE_START_POST &&
 274             state != SERVICE_RELOAD &&
 275             state != SERVICE_STOP &&
 276             state != SERVICE_STOP_SIGTERM &&
 277             state != SERVICE_STOP_SIGKILL &&
 278             state != SERVICE_STOP_POST &&
 279             state != SERVICE_FINAL_SIGTERM &&
 280             state != SERVICE_FINAL_SIGKILL &&
 281             state != SERVICE_AUTO_RESTART)
 282                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 283
 284         if (state != SERVICE_START &&
 285             state != SERVICE_START_POST &&
 286             state != SERVICE_RUNNING &&
 287             state != SERVICE_RELOAD &&
 288             state != SERVICE_STOP &&
 289             state != SERVICE_STOP_SIGTERM &&
 290             state != SERVICE_STOP_SIGKILL)
 291                 if (s->main_pid > 0) {
 292                         unit_unwatch_pid(UNIT(s), s->main_pid);
 293                         s->main_pid = 0;
 294                 }
 295
 296         if (state != SERVICE_START_PRE &&
 297             state != SERVICE_START &&
 298             state != SERVICE_START_POST &&
 299             state != SERVICE_RELOAD &&
 300             state != SERVICE_STOP &&
 301             state != SERVICE_STOP_SIGTERM &&
 302             state != SERVICE_STOP_SIGKILL &&
 303             state != SERVICE_STOP_POST &&
 304             state != SERVICE_FINAL_SIGTERM &&
 305             state != SERVICE_FINAL_SIGKILL)
 306                 if (s->control_pid > 0) {
 307                         unit_unwatch_pid(UNIT(s), s->control_pid);
 308                         s->control_pid = 0;
 309                 }
 310
 311         if (state != SERVICE_START_PRE &&
 312             state != SERVICE_START &&
 313             state != SERVICE_START_POST &&
 314             state != SERVICE_RELOAD &&
 315             state != SERVICE_STOP &&
 316             state != SERVICE_STOP_POST)
 317                 s->control_command = NULL;
 318
 319         if (state == SERVICE_DEAD ||
 320             state == SERVICE_STOP ||
 321             state == SERVICE_STOP_SIGTERM ||
 322             state == SERVICE_STOP_SIGKILL ||
 323             state == SERVICE_STOP_POST ||
 324             state == SERVICE_FINAL_SIGTERM ||
 325             state == SERVICE_FINAL_SIGKILL ||
 326             state == SERVICE_MAINTAINANCE ||
 327             state == SERVICE_AUTO_RESTART)
 328                 service_notify_sockets(s);
 329
 330         log_debug("%s changed %s → %s", unit_id(UNIT(s)), service_state_to_string(old_state), service_state_to_string(state));
 331
 332         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 333 }
 334
 335 static int service_collect_fds(Service *s, int **fds, unsigned *n_fds) {
 336         Iterator i;
 337         int r;
 338         int *rfds = NULL;
 339         unsigned rn_fds = 0;
 340         Set *set;
 341         Socket *sock;
 342
 343         assert(s);
 344         assert(fds);
 345         assert(n_fds);
 346
 347         if ((r = service_get_sockets(s, &set)) < 0)
 348                 return r;
 349
 350         SET_FOREACH(sock, set, i) {
 351                 int *cfds;
 352                 unsigned cn_fds;
 353
 354                 if ((r = socket_collect_fds(sock, &cfds, &cn_fds)) < 0)
 355                         goto fail;
 356
 357                 if (!cfds)
 358                         continue;
 359
 360                 if (!rfds) {
 361                         rfds = cfds;
 362                         rn_fds = cn_fds;
 363                 } else {
 364                         int *t;
 365
 366                         if (!(t = new(int, rn_fds+cn_fds))) {
 367                                 free(cfds);
 368                                 r = -ENOMEM;
 369                                 goto fail;
 370                         }
 371
 372                         memcpy(t, rfds, rn_fds);
 373                         memcpy(t+rn_fds, cfds, cn_fds);
 374                         free(rfds);
 375                         free(cfds);
 376
 377                         rfds = t;
 378                         rn_fds = rn_fds+cn_fds;
 379                 }
 380         }
 381
 382         *fds = rfds;
 383         *n_fds = rn_fds;
 384
 385         set_free(set);
 386
 387         return 0;
 388
 389 fail:
 390         set_free(set);
 391         free(rfds);
 392
 393         return r;
 394 }
 395
 396 static int service_spawn(Service *s, ExecCommand *c, bool timeout, bool pass_fds, pid_t *_pid) {
 397         pid_t pid;
 398         int r;
 399         int *fds = NULL;
 400         unsigned n_fds = 0;
 401
 402         assert(s);
 403         assert(c);
 404         assert(_pid);
 405
 406         if (pass_fds)
 407                 if ((r = service_collect_fds(s, &fds, &n_fds)) < 0)
 408                         goto fail;
 409
 410         if (timeout) {
 411                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 412                         goto fail;
 413         } else
 414                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 415
 416         if ((r = exec_spawn(c, &s->exec_context, fds, n_fds, &pid)) < 0)
 417                 goto fail;
 418
 419         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 420                 /* FIXME: we need to do something here */
 421                 goto fail;
 422
 423         free(fds);
 424         *_pid = pid;
 425
 426         return 0;
 427
 428 fail:
 429         free(fds);
 430
 431         if (timeout)
 432                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 433
 434         return r;
 435 }
 436
 437 static void service_enter_dead(Service *s, bool success, bool allow_restart) {
 438         int r;
 439         assert(s);
 440
 441         if (!success)
 442                 s->failure = true;
 443
 444         if (allow_restart &&
 445             (s->restart == SERVICE_RESTART_ALWAYS ||
 446              (s->restart == SERVICE_RESTART_ON_SUCCESS && !s->failure))) {
 447
 448                 if ((r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch)) < 0)
 449                         goto fail;
 450
 451                 service_set_state(s, SERVICE_AUTO_RESTART);
 452         } else
 453                 service_set_state(s, s->failure ? SERVICE_MAINTAINANCE : SERVICE_DEAD);
 454
 455         return;
 456
 457 fail:
 458         log_warning("%s failed to run install restart timer: %s", unit_id(UNIT(s)), strerror(-r));
 459         service_enter_dead(s, false, false);
 460 }
 461
 462 static void service_enter_signal(Service *s, ServiceState state, bool success);
 463
 464 static void service_enter_stop_post(Service *s, bool success) {
 465         int r;
 466         assert(s);
 467
 468         if (!success)
 469                 s->failure = true;
 470
 471         if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST]))
 472                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 473                         goto fail;
 474
 475
 476         service_set_state(s, SERVICE_STOP_POST);
 477
 478         if (!s->control_command)
 479                 service_enter_dead(s, true, true);
 480
 481         return;
 482
 483 fail:
 484         log_warning("%s failed to run stop executable: %s", unit_id(UNIT(s)), strerror(-r));
 485         service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
 486 }
 487
 488 static void service_enter_signal(Service *s, ServiceState state, bool success) {
 489         int r;
 490         bool sent = false;
 491
 492         assert(s);
 493
 494         if (!success)
 495                 s->failure = true;
 496
 497         if (s->main_pid > 0 || s->control_pid > 0) {
 498                 int sig;
 499
 500                 sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
 501
 502                 r = 0;
 503                 if (s->main_pid > 0) {
 504                         if (kill(s->main_pid, sig) < 0 && errno != ESRCH)
 505                                 r = -errno;
 506                         else
 507                                 sent = true;
 508                 }
 509
 510                 if (s->control_pid > 0) {
 511                         if (kill(s->control_pid, sig) < 0 && errno != ESRCH)
 512                                 r = -errno;
 513                         else
 514                                 sent = true;
 515                 }
 516
 517                 if (r < 0)
 518                         goto fail;
 519         }
 520
 521         service_set_state(s, state);
 522
 523         if (s->main_pid <= 0 && s->control_pid <= 0)
 524                 service_enter_dead(s, true, true);
 525
 526         return;
 527
 528 fail:
 529         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
 530
 531         if (sent)  {
 532                 s->failure = true;
 533                 service_set_state(s, state);
 534         } else if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
 535                 service_enter_stop_post(s, false);
 536         else
 537                 service_enter_dead(s, false, true);
 538 }
 539
 540 static void service_enter_stop(Service *s, bool success) {
 541         int r;
 542         assert(s);
 543
 544         if (!success)
 545                 s->failure = true;
 546
 547         if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP]))
 548                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 549                         goto fail;
 550
 551         service_set_state(s, SERVICE_STOP);
 552
 553         if (!s->control_command)
 554                 service_enter_signal(s, SERVICE_STOP_SIGTERM, true);
 555
 556         return;
 557
 558 fail:
 559         log_warning("%s failed to run stop executable: %s", unit_id(UNIT(s)), strerror(-r));
 560         service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
 561 }
 562
 563 static void service_enter_start_post(Service *s) {
 564         int r;
 565         assert(s);
 566
 567         if ((s->control_command = s->exec_command[SERVICE_EXEC_START_POST]))
 568                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 569                         goto fail;
 570
 571
 572         service_set_state(s, SERVICE_START_POST);
 573
 574         if (!s->control_command)
 575                 service_set_state(s, SERVICE_RUNNING);
 576
 577         return;
 578
 579 fail:
 580         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 581         service_enter_stop(s, false);
 582 }
 583
 584 static void service_enter_start(Service *s) {
 585         pid_t pid;
 586         int r;
 587
 588         assert(s);
 589
 590         assert(s->exec_command[SERVICE_EXEC_START]);
 591         assert(!s->exec_command[SERVICE_EXEC_START]->command_next);
 592
 593         if ((r = service_spawn(s, s->exec_command[SERVICE_EXEC_START], s->type == SERVICE_FORKING, true, &pid)) < 0)
 594                 goto fail;
 595
 596         service_set_state(s, SERVICE_START);
 597
 598         if (s->type == SERVICE_SIMPLE) {
 599                 /* For simple services we immediately start
 600                  * the START_POST binaries. */
 601
 602                 s->main_pid = pid;
 603                 s->main_pid_known = true;
 604                 service_enter_start_post(s);
 605
 606         } else  if (s->type == SERVICE_FORKING) {
 607
 608                 /* For forking services we wait until the start
 609                  * process exited. */
 610
 611                 s->control_pid = pid;
 612                 s->control_command = s->exec_command[SERVICE_EXEC_START];
 613         } else if (s->type == SERVICE_FINISH) {
 614
 615                 /* For finishing services we wait until the start
 616                  * process exited, too, but it is our main process. */
 617
 618                 s->main_pid = pid;
 619                 s->control_command = s->exec_command[SERVICE_EXEC_START];
 620         } else
 621                 assert_not_reached("Unknown service type");
 622
 623         return;
 624
 625 fail:
 626         log_warning("%s failed to run start exectuable: %s", unit_id(UNIT(s)), strerror(-r));
 627         service_enter_stop(s, false);
 628 }
 629
 630 static void service_enter_start_pre(Service *s) {
 631         int r;
 632
 633         assert(s);
 634
 635         if ((s->control_command = s->exec_command[SERVICE_EXEC_START_PRE]))
 636                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 637                         goto fail;
 638
 639         service_set_state(s, SERVICE_START_PRE);
 640
 641         if (!s->control_command)
 642                 service_enter_start(s);
 643
 644         return;
 645
 646 fail:
 647         log_warning("%s failed to run start-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
 648         service_enter_dead(s, false, true);
 649 }
 650
 651 static void service_enter_restart(Service *s) {
 652         int r;
 653         assert(s);
 654
 655         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s), JOB_FAIL, false, NULL)) < 0)
 656                 goto fail;
 657
 658         log_debug("%s scheduled restart job.", unit_id(UNIT(s)));
 659         service_enter_dead(s, true, false);
 660         return;
 661
 662 fail:
 663
 664         log_warning("%s failed to schedule restart job: %s", unit_id(UNIT(s)), strerror(-r));
 665         service_enter_dead(s, false, false);
 666 }
 667
 668 static void service_enter_reload(Service *s) {
 669         int r;
 670
 671         assert(s);
 672
 673         if ((s->control_command = s->exec_command[SERVICE_EXEC_RELOAD]))
 674                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 675                         goto fail;
 676
 677         service_set_state(s, SERVICE_RELOAD);
 678
 679         if (!s->control_command)
 680                 service_set_state(s, SERVICE_RUNNING);
 681
 682         return;
 683
 684 fail:
 685         log_warning("%s failed to run reload executable: %s", unit_id(UNIT(s)), strerror(-r));
 686         service_enter_stop(s, false);
 687 }
 688
 689 static void service_run_next(Service *s, bool success) {
 690         int r;
 691
 692         assert(s);
 693         assert(s->control_command);
 694         assert(s->control_command->command_next);
 695
 696         if (!success)
 697                 s->failure = true;
 698
 699         s->control_command = s->control_command->command_next;
 700
 701         if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 702                 goto fail;
 703
 704         return;
 705
 706 fail:
 707         log_warning("%s failed to run spawn next executable: %s", unit_id(UNIT(s)), strerror(-r));
 708
 709         if (s->state == SERVICE_STOP)
 710                 service_enter_stop_post(s, false);
 711         else if (s->state == SERVICE_STOP_POST)
 712                 service_enter_dead(s, false, true);
 713         else
 714                 service_enter_stop(s, false);
 715 }
 716
 717 static int service_start(Unit *u) {
 718         Service *s = SERVICE(u);
 719
 720         assert(s);
 721
 722         /* We cannot fulfill this request right now, try again later
 723          * please! */
 724         if (s->state == SERVICE_STOP ||
 725             s->state == SERVICE_STOP_SIGTERM ||
 726             s->state == SERVICE_STOP_SIGKILL ||
 727             s->state == SERVICE_STOP_POST ||
 728             s->state == SERVICE_FINAL_SIGTERM ||
 729             s->state == SERVICE_FINAL_SIGKILL)
 730                 return -EAGAIN;
 731
 732         /* Already on it! */
 733         if (s->state == SERVICE_START_PRE ||
 734             s->state == SERVICE_START ||
 735             s->state == SERVICE_START_POST)
 736                 return 0;
 737
 738         assert(s->state == SERVICE_DEAD || s->state == SERVICE_MAINTAINANCE || s->state == SERVICE_AUTO_RESTART);
 739
 740         /* Make sure we don't enter a busy loop of some kind. */
 741         if (!ratelimit_test(&s->ratelimit)) {
 742                 log_warning("%s start request repeated too quickly, refusing to start.", unit_id(u));
 743                 return -EAGAIN;
 744         }
 745
 746         s->failure = false;
 747         s->main_pid_known = false;
 748
 749         service_enter_start_pre(s);
 750         return 0;
 751 }
 752
 753 static int service_stop(Unit *u) {
 754         Service *s = SERVICE(u);
 755
 756         assert(s);
 757
 758         if (s->state == SERVICE_START_PRE ||
 759             s->state == SERVICE_START ||
 760             s->state == SERVICE_START_POST ||
 761             s->state == SERVICE_RELOAD)
 762                 return -EAGAIN;
 763
 764         if (s->state == SERVICE_AUTO_RESTART) {
 765                 service_set_state(s, SERVICE_DEAD);
 766                 return 0;
 767         }
 768
 769         assert(s->state == SERVICE_RUNNING);
 770
 771         service_enter_stop(s, true);
 772         return 0;
 773 }
 774
 775 static int service_reload(Unit *u) {
 776         Service *s = SERVICE(u);
 777
 778         assert(s);
 779
 780         assert(s->state == SERVICE_RUNNING);
 781
 782         service_enter_reload(s);
 783         return 0;
 784 }
 785
 786 static bool service_can_reload(Unit *u) {
 787         Service *s = SERVICE(u);
 788
 789         assert(s);
 790
 791         return !!s->exec_command[SERVICE_EXEC_RELOAD];
 792 }
 793
 794 static UnitActiveState service_active_state(Unit *u) {
 795         assert(u);
 796
 797         return state_translation_table[SERVICE(u)->state];
 798 }
 799
 800 static int main_pid_good(Service *s) {
 801         assert(s);
 802
 803         /* Returns 0 if the pid is dead, 1 if it is good, -1 if we
 804          * don't know */
 805
 806         /* If we know the pid file, then lets just check if it is
 807          * still valid */
 808         if (s->main_pid_known)
 809                 return s->main_pid > 0;
 810
 811         /* We don't know the pid */
 812         return -1;
 813 }
 814
 815 static bool control_pid_good(Service *s) {
 816         assert(s);
 817
 818         return s->control_pid > 0;
 819 }
 820
 821 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 822         Service *s = SERVICE(u);
 823         bool success;
 824
 825         assert(s);
 826         assert(pid >= 0);
 827
 828         success = code == CLD_EXITED && status == 0;
 829         s->failure = s->failure || !success;
 830
 831         if (s->main_pid == pid) {
 832
 833                 exec_status_fill(&s->main_exec_status, pid, code, status);
 834                 s->main_pid = 0;
 835
 836                 if (s->type == SERVICE_SIMPLE || s->type == SERVICE_FINISH) {
 837                         assert(s->exec_command[SERVICE_EXEC_START]);
 838                         s->exec_command[SERVICE_EXEC_START]->exec_status = s->main_exec_status;
 839                 }
 840
 841                 log_debug("%s: main process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 842
 843                 /* The service exited, so the service is officially
 844                  * gone. */
 845
 846                 switch (s->state) {
 847
 848                 case SERVICE_START_POST:
 849                 case SERVICE_RELOAD:
 850                 case SERVICE_STOP:
 851                         /* Need to wait until the operation is
 852                          * done */
 853                         break;
 854
 855                 case SERVICE_START:
 856                         assert(s->type == SERVICE_FINISH);
 857
 858                         /* This was our main goal, so let's go on */
 859                         if (success)
 860                                 service_enter_start_post(s);
 861                         else
 862                                 service_enter_stop(s, false);
 863                         break;
 864
 865                 case SERVICE_RUNNING:
 866                         service_enter_stop(s, success);
 867                         break;
 868
 869                 case SERVICE_STOP_SIGTERM:
 870                 case SERVICE_STOP_SIGKILL:
 871
 872                         if (!control_pid_good(s))
 873                                 service_enter_stop_post(s, success);
 874
 875                         /* If there is still a control process, wait for that first */
 876                         break;
 877
 878                 default:
 879                         assert_not_reached("Uh, main process died at wrong time.");
 880                 }
 881
 882         } else if (s->control_pid == pid) {
 883                 assert(s->control_command);
 884
 885                 exec_status_fill(&s->control_command->exec_status, pid, code, status);
 886                 s->control_pid = 0;
 887
 888                 log_debug("%s: control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 889
 890                 /* If we are shutting things down anyway we
 891                  * don't care about failing commands. */
 892
 893                 if (s->control_command->command_next &&
 894                     (success || (s->state == SERVICE_EXEC_STOP || s->state == SERVICE_EXEC_STOP_POST)))
 895
 896                         /* There is another command to *
 897                          * execute, so let's do that. */
 898
 899                         service_run_next(s, success);
 900
 901                 else {
 902                         /* No further commands for this step, so let's
 903                          * figure out what to do next */
 904
 905                         log_debug("%s got final SIGCHLD for state %s", unit_id(u), service_state_to_string(s->state));
 906
 907                         switch (s->state) {
 908
 909                         case SERVICE_START_PRE:
 910                                 if (success)
 911                                         service_enter_start(s);
 912                                 else
 913                                         service_enter_stop(s, false);
 914                                 break;
 915
 916                         case SERVICE_START:
 917                                 assert(s->type == SERVICE_FORKING);
 918
 919                                 /* Let's try to load the pid
 920                                  * file here if we can. We
 921                                  * ignore the return value,
 922                                  * since the PID file might
 923                                  * actually be created by a
 924                                  * START_POST script */
 925
 926                                 if (success) {
 927                                         if (s->pid_file)
 928                                                 service_load_pid_file(s);
 929
 930                                         service_enter_start_post(s);
 931                                 } else
 932                                         service_enter_stop(s, false);
 933
 934                                 break;
 935
 936                         case SERVICE_START_POST:
 937                                 if (success && s->pid_file && !s->main_pid_known) {
 938                                         int r;
 939
 940                                         /* Hmm, let's see if we can
 941                                          * load the pid now after the
 942                                          * start-post scripts got
 943                                          * executed. */
 944
 945                                         if ((r = service_load_pid_file(s)) < 0)
 946                                                 log_warning("%s: failed to load PID file %s: %s", unit_id(UNIT(s)), s->pid_file, strerror(-r));
 947                                 }
 948
 949                                 /* Fall through */
 950
 951                         case SERVICE_RELOAD:
 952                                 if (success) {
 953                                         if (main_pid_good(s) != 0)
 954                                                 service_set_state(s, SERVICE_RUNNING);
 955                                         else
 956                                                 service_enter_stop(s, true);
 957                                 } else
 958                                         service_enter_stop(s, false);
 959
 960                                 break;
 961
 962                         case SERVICE_STOP:
 963                                 if (main_pid_good(s) > 0)
 964                                         /* Still not dead and we know the PID? Let's go hunting. */
 965                                         service_enter_signal(s, SERVICE_STOP_SIGTERM, success);
 966                                 else
 967                                         service_enter_stop_post(s, success);
 968                                 break;
 969
 970                         case SERVICE_STOP_SIGTERM:
 971                         case SERVICE_STOP_SIGKILL:
 972                                 if (main_pid_good(s) <= 0)
 973                                         service_enter_stop_post(s, success);
 974
 975                                 /* If there is still a service
 976                                  * process around, wait until
 977                                  * that one quit, too */
 978                                 break;
 979
 980                         case SERVICE_STOP_POST:
 981                         case SERVICE_FINAL_SIGTERM:
 982                         case SERVICE_FINAL_SIGKILL:
 983                                 service_enter_dead(s, success, true);
 984                                 break;
 985
 986                         default:
 987                                 assert_not_reached("Uh, control process died at wrong time.");
 988                         }
 989                 }
 990         } else
 991                 assert_not_reached("Got SIGCHLD for unkown PID");
 992 }
 993
 994 static void service_timer_event(Unit *u, uint64_t elapsed, Watch* w) {
 995         Service *s = SERVICE(u);
 996
 997         assert(s);
 998         assert(elapsed == 1);
 999
1000         assert(w == &s->timer_watch);
1001
1002         switch (s->state) {
1003
1004         case SERVICE_START_PRE:
1005         case SERVICE_START:
1006         case SERVICE_START_POST:
1007         case SERVICE_RELOAD:
1008                 log_warning("%s operation timed out. Stopping.", unit_id(u));
1009                 service_enter_stop(s, false);
1010                 break;
1011
1012         case SERVICE_STOP:
1013                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
1014                 service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
1015                 break;
1016
1017         case SERVICE_STOP_SIGTERM:
1018                 log_warning("%s stopping timed out. Killing.", unit_id(u));
1019                 service_enter_signal(s, SERVICE_STOP_SIGKILL, false);
1020                 break;
1021
1022         case SERVICE_STOP_SIGKILL:
1023                 /* Uh, wie sent a SIGKILL and it is still not gone?
1024                  * Must be something we cannot kill, so let's just be
1025                  * weirded out and continue */
1026
1027                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
1028                 service_enter_stop_post(s, false);
1029                 break;
1030
1031         case SERVICE_STOP_POST:
1032                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
1033                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1034                 break;
1035
1036         case SERVICE_FINAL_SIGTERM:
1037                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
1038                 service_enter_signal(s, SERVICE_FINAL_SIGKILL, false);
1039                 break;
1040
1041         case SERVICE_FINAL_SIGKILL:
1042                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
1043                 service_enter_dead(s, false, true);
1044                 break;
1045
1046         case SERVICE_AUTO_RESTART:
1047                 log_debug("%s holdoff time over, scheduling restart.", unit_id(u));
1048                 service_enter_restart(s);
1049                 break;
1050
1051         default:
1052                 assert_not_reached("Timeout at wrong time.");
1053         }
1054 }
1055
1056 static const char* const service_state_table[_SERVICE_STATE_MAX] = {
1057         [SERVICE_DEAD] = "dead",
1058         [SERVICE_START_PRE] = "start-pre",
1059         [SERVICE_START] = "start",
1060         [SERVICE_START_POST] = "start-post",
1061         [SERVICE_RUNNING] = "running",
1062         [SERVICE_RELOAD] = "reload",
1063         [SERVICE_STOP] = "stop",
1064         [SERVICE_STOP_SIGTERM] = "stop-sigterm",
1065         [SERVICE_STOP_SIGKILL] = "stop-sigkill",
1066         [SERVICE_STOP_POST] = "stop-post",
1067         [SERVICE_FINAL_SIGTERM] = "final-sigterm",
1068         [SERVICE_FINAL_SIGKILL] = "final-sigkill",
1069         [SERVICE_MAINTAINANCE] = "maintainance",
1070         [SERVICE_AUTO_RESTART] = "auto-restart",
1071 };
1072
1073 DEFINE_STRING_TABLE_LOOKUP(service_state, ServiceState);
1074
1075 static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
1076         [SERVICE_ONCE] = "once",
1077         [SERVICE_RESTART_ON_SUCCESS] = "restart-on-success",
1078         [SERVICE_RESTART_ALWAYS] = "restart-on-failure",
1079 };
1080
1081 DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
1082
1083 static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
1084         [SERVICE_FORKING] = "forking",
1085         [SERVICE_SIMPLE] = "simple",
1086         [SERVICE_FINISH] = "finish"
1087 };
1088
1089 DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
1090
1091 static const char* const service_exec_command_table[_SERVICE_EXEC_MAX] = {
1092         [SERVICE_EXEC_START_PRE] = "ExecStartPre",
1093         [SERVICE_EXEC_START] = "ExecStart",
1094         [SERVICE_EXEC_START_POST] = "ExecStartPost",
1095         [SERVICE_EXEC_RELOAD] = "ExecReload",
1096         [SERVICE_EXEC_STOP] = "ExecStop",
1097         [SERVICE_EXEC_STOP_POST] = "ExecStopPost",
1098 };
1099
1100 DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand);
1101
1102 const UnitVTable service_vtable = {
1103         .suffix = ".service",
1104
1105         .init = service_init,
1106         .done = service_done,
1107
1108         .dump = service_dump,
1109
1110         .start = service_start,
1111         .stop = service_stop,
1112         .reload = service_reload,
1113
1114         .can_reload = service_can_reload,
1115
1116         .active_state = service_active_state,
1117
1118         .sigchld_event = service_sigchld_event,
1119         .timer_event = service_timer_event,
1120 };