service.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #include <errno.h>
   4 #include <signal.h>
   5
   6 #include "unit.h"
   7 #include "service.h"
   8 #include "load-fragment.h"
   9 #include "load-dropin.h"
  10 #include "log.h"
  11
  12 static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
  13         [SERVICE_DEAD] = UNIT_INACTIVE,
  14         [SERVICE_START_PRE] = UNIT_ACTIVATING,
  15         [SERVICE_START] = UNIT_ACTIVATING,
  16         [SERVICE_START_POST] = UNIT_ACTIVATING,
  17         [SERVICE_RUNNING] = UNIT_ACTIVE,
  18         [SERVICE_RELOAD] = UNIT_ACTIVE_RELOADING,
  19         [SERVICE_STOP] = UNIT_DEACTIVATING,
  20         [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
  21         [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
  22         [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
  23         [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
  24         [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
  25         [SERVICE_MAINTAINANCE] = UNIT_INACTIVE,
  26         [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING,
  27 };
  28
  29 static const char* const state_string_table[_SERVICE_STATE_MAX] = {
  30         [SERVICE_DEAD] = "dead",
  31         [SERVICE_START_PRE] = "start-pre",
  32         [SERVICE_START] = "start",
  33         [SERVICE_START_POST] = "start-post",
  34         [SERVICE_RUNNING] = "running",
  35         [SERVICE_RELOAD] = "reload",
  36         [SERVICE_STOP] = "stop",
  37         [SERVICE_STOP_SIGTERM] = "stop-sigterm",
  38         [SERVICE_STOP_SIGKILL] = "stop-sigkill",
  39         [SERVICE_STOP_POST] = "stop-post",
  40         [SERVICE_FINAL_SIGTERM] = "final-sigterm",
  41         [SERVICE_FINAL_SIGKILL] = "final-sigkill",
  42         [SERVICE_MAINTAINANCE] = "maintainance",
  43         [SERVICE_AUTO_RESTART] = "auto-restart",
  44 };
  45
  46 static void service_done(Unit *u) {
  47         Service *s = SERVICE(u);
  48
  49         assert(s);
  50
  51         free(s->pid_file);
  52         s->pid_file = NULL;
  53
  54         exec_context_done(&s->exec_context);
  55         exec_command_free_array(s->exec_command, _SERVICE_EXEC_MAX);
  56         s->control_command = NULL;
  57
  58         /* This will leak a process, but at least no memory or any of
  59          * our resources */
  60         if (s->main_pid > 0) {
  61                 unit_unwatch_pid(u, s->main_pid);
  62                 s->main_pid = 0;
  63         }
  64
  65         if (s->control_pid > 0) {
  66                 unit_unwatch_pid(u, s->control_pid);
  67                 s->control_pid = 0;
  68         }
  69
  70         unit_unwatch_timer(u, &s->timer_watch);
  71 }
  72
  73 static int service_load_sysv(Service *s) {
  74         assert(s);
  75
  76         /* Load service data from SysV init scripts, preferably with
  77          * LSB headers ... */
  78
  79         return -ENOENT;
  80 }
  81
  82 static int service_init(Unit *u) {
  83         int r;
  84         Service *s = SERVICE(u);
  85
  86         assert(s);
  87
  88         /* First, reset everything to the defaults, in case this is a
  89          * reload */
  90
  91         s->type = 0;
  92         s->restart = 0;
  93
  94         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  95         s->restart_usec = DEFAULT_RESTART_USEC;
  96
  97         exec_context_init(&s->exec_context);
  98
  99         s->timer_watch.type = WATCH_INVALID;
 100
 101         s->state = SERVICE_DEAD;
 102
 103         RATELIMIT_INIT(s->ratelimit, 10*USEC_PER_SEC, 5);
 104
 105         /* Load a .service file */
 106         if ((r = unit_load_fragment(u)) < 0) {
 107                 service_done(u);
 108                 return r;
 109         }
 110
 111         /* Load a classic init script as a fallback, if we couldn*t find anything */
 112         if (r == 0)
 113                 if ((r = service_load_sysv(s)) <= 0) {
 114                         service_done(u);
 115                         return r < 0 ? r : -ENOENT;
 116                 }
 117
 118         /* Load dropin directory data */
 119         if ((r = unit_load_dropin(u)) < 0) {
 120                 service_done(u);
 121                 return r;
 122         }
 123
 124         return 0;
 125 }
 126
 127 static void service_dump(Unit *u, FILE *f, const char *prefix) {
 128
 129         static const char* const command_table[_SERVICE_EXEC_MAX] = {
 130                 [SERVICE_EXEC_START_PRE] = "ExecStartPre",
 131                 [SERVICE_EXEC_START] = "ExecStart",
 132                 [SERVICE_EXEC_START_POST] = "ExecStartPost",
 133                 [SERVICE_EXEC_RELOAD] = "ExecReload",
 134                 [SERVICE_EXEC_STOP] = "ExecStop",
 135                 [SERVICE_EXEC_STOP_POST] = "ExecStopPost",
 136         };
 137
 138         ServiceExecCommand c;
 139         Service *s = SERVICE(u);
 140         char *prefix2;
 141
 142         assert(s);
 143
 144         prefix2 = strappend(prefix, "\t");
 145         if (!prefix2)
 146                 prefix2 = "";
 147
 148         fprintf(f,
 149                 "%sService State: %s\n",
 150                 prefix, state_string_table[s->state]);
 151
 152         if (s->pid_file)
 153                 fprintf(f,
 154                         "%sPIDFile: %s\n",
 155                         prefix, s->pid_file);
 156
 157
 158         exec_context_dump(&s->exec_context, f, prefix);
 159
 160         for (c = 0; c < _SERVICE_EXEC_MAX; c++) {
 161
 162                 if (!s->exec_command[c])
 163                         continue;
 164
 165                 fprintf(f, "%s→ %s:\n",
 166                         prefix, command_table[c]);
 167
 168                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 169         }
 170
 171         free(prefix2);
 172 }
 173
 174 static int service_load_pid_file(Service *s) {
 175         char *k;
 176         unsigned long p;
 177         int r;
 178
 179         assert(s);
 180
 181         if (s->main_pid_known)
 182                 return 0;
 183
 184         if (!s->pid_file)
 185                 return -ENOENT;
 186
 187         if ((r = read_one_line_file(s->pid_file, &k)) < 0)
 188                 return r;
 189
 190         if ((r = safe_atolu(k, &p)) < 0) {
 191                 free(k);
 192                 return r;
 193         }
 194
 195         if ((unsigned long) (pid_t) p != p)
 196                 return -ERANGE;
 197
 198         s->main_pid = p;
 199         s->main_pid_known = true;
 200
 201         return 0;
 202 }
 203
 204 static int service_get_sockets(Service *s, Set **_set) {
 205         Set *set;
 206         Iterator i;
 207         char *t;
 208         int r;
 209
 210         assert(s);
 211         assert(_set);
 212
 213         /* Collects all Socket objects that belong to this
 214          * service. Note that a service might have multiple sockets
 215          * via multiple names. */
 216
 217         if (!(set = set_new(NULL, NULL)))
 218                 return -ENOMEM;
 219
 220         SET_FOREACH(t, UNIT(s)->meta.names, i) {
 221                 char *k;
 222                 Unit *p;
 223
 224                 /* Look for all socket objects that go by any of our
 225                  * units and collect their fds */
 226
 227                 if (!(k = unit_name_change_suffix(t, ".socket"))) {
 228                         r = -ENOMEM;
 229                         goto fail;
 230                 }
 231
 232                 p = manager_get_unit(UNIT(s)->meta.manager, k);
 233                 free(k);
 234
 235                 if (!p) continue;
 236
 237                 if ((r = set_put(set, p)) < 0)
 238                         goto fail;
 239         }
 240
 241         *_set = set;
 242         return 0;
 243
 244 fail:
 245         set_free(set);
 246         return r;
 247 }
 248
 249
 250 static int service_notify_sockets(Service *s) {
 251         Iterator i;
 252         Set *set;
 253         Socket *socket;
 254         int r;
 255
 256         assert(s);
 257
 258         /* Notifies all our sockets when we die */
 259
 260         if ((r = service_get_sockets(s, &set)) < 0)
 261                 return r;
 262
 263         SET_FOREACH(socket, set, i)
 264                 socket_notify_service_dead(socket);
 265
 266         set_free(set);
 267
 268         return 0;
 269 }
 270
 271 static void service_set_state(Service *s, ServiceState state) {
 272         ServiceState old_state;
 273         assert(s);
 274
 275         old_state = s->state;
 276         s->state = state;
 277
 278         if (state != SERVICE_START_PRE &&
 279             state != SERVICE_START &&
 280             state != SERVICE_START_POST &&
 281             state != SERVICE_RELOAD &&
 282             state != SERVICE_STOP &&
 283             state != SERVICE_STOP_SIGTERM &&
 284             state != SERVICE_STOP_SIGKILL &&
 285             state != SERVICE_STOP_POST &&
 286             state != SERVICE_FINAL_SIGTERM &&
 287             state != SERVICE_FINAL_SIGKILL &&
 288             state != SERVICE_AUTO_RESTART)
 289                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 290
 291         if (state != SERVICE_START_POST &&
 292             state != SERVICE_RUNNING &&
 293             state != SERVICE_RELOAD &&
 294             state != SERVICE_STOP &&
 295             state != SERVICE_STOP_SIGTERM &&
 296             state != SERVICE_STOP_SIGKILL)
 297                 if (s->main_pid > 0) {
 298                         unit_unwatch_pid(UNIT(s), s->main_pid);
 299                         s->main_pid = 0;
 300                 }
 301
 302         if (state != SERVICE_START_PRE &&
 303             state != SERVICE_START &&
 304             state != SERVICE_START_POST &&
 305             state != SERVICE_RELOAD &&
 306             state != SERVICE_STOP &&
 307             state != SERVICE_STOP_SIGTERM &&
 308             state != SERVICE_STOP_SIGKILL &&
 309             state != SERVICE_STOP_POST &&
 310             state != SERVICE_FINAL_SIGTERM &&
 311             state != SERVICE_FINAL_SIGKILL)
 312                 if (s->control_pid > 0) {
 313                         unit_unwatch_pid(UNIT(s), s->control_pid);
 314                         s->control_pid = 0;
 315                 }
 316
 317         if (state != SERVICE_START_PRE &&
 318             state != SERVICE_START &&
 319             state != SERVICE_START_POST &&
 320             state != SERVICE_RELOAD &&
 321             state != SERVICE_STOP &&
 322             state != SERVICE_STOP_POST)
 323                 s->control_command = NULL;
 324
 325         if (state == SERVICE_DEAD ||
 326             state == SERVICE_STOP ||
 327             state == SERVICE_STOP_SIGTERM ||
 328             state == SERVICE_STOP_SIGKILL ||
 329             state == SERVICE_STOP_POST ||
 330             state == SERVICE_FINAL_SIGTERM ||
 331             state == SERVICE_FINAL_SIGKILL ||
 332             state == SERVICE_MAINTAINANCE ||
 333             state == SERVICE_AUTO_RESTART)
 334                 service_notify_sockets(s);
 335
 336         log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 337
 338         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 339 }
 340
 341 static int service_collect_fds(Service *s, int **fds, unsigned *n_fds) {
 342         Iterator i;
 343         int r;
 344         int *rfds = NULL;
 345         unsigned rn_fds = 0;
 346         Set *set;
 347         Socket *socket;
 348
 349         assert(s);
 350         assert(fds);
 351         assert(n_fds);
 352
 353         if ((r = service_get_sockets(s, &set)) < 0)
 354                 return r;
 355
 356         SET_FOREACH(socket, set, i) {
 357                 int *cfds;
 358                 unsigned cn_fds;
 359
 360                 if ((r = socket_collect_fds(socket, &cfds, &cn_fds)) < 0)
 361                         goto fail;
 362
 363                 if (!cfds)
 364                         continue;
 365
 366                 if (!rfds) {
 367                         rfds = cfds;
 368                         rn_fds = cn_fds;
 369                 } else {
 370                         int *t;
 371
 372                         if (!(t = new(int, rn_fds+cn_fds))) {
 373                                 free(cfds);
 374                                 r = -ENOMEM;
 375                                 goto fail;
 376                         }
 377
 378                         memcpy(t, rfds, rn_fds);
 379                         memcpy(t+rn_fds, cfds, cn_fds);
 380                         free(rfds);
 381                         free(cfds);
 382
 383                         rfds = t;
 384                         rn_fds = rn_fds+cn_fds;
 385                 }
 386         }
 387
 388         *fds = rfds;
 389         *n_fds = rn_fds;
 390
 391         set_free(set);
 392
 393         return 0;
 394
 395 fail:
 396         set_free(set);
 397         free(rfds);
 398
 399         return r;
 400 }
 401
 402 static int service_spawn(Service *s, ExecCommand *c, bool timeout, bool pass_fds, pid_t *_pid) {
 403         pid_t pid;
 404         int r;
 405         int *fds = NULL;
 406         unsigned n_fds = 0;
 407
 408         assert(s);
 409         assert(c);
 410         assert(_pid);
 411
 412         if (pass_fds)
 413                 if ((r = service_collect_fds(s, &fds, &n_fds)) < 0)
 414                         goto fail;
 415
 416         if (timeout) {
 417                 if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 418                         goto fail;
 419         } else
 420                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 421
 422         if ((r = exec_spawn(c, &s->exec_context, fds, n_fds, &pid)) < 0)
 423                 goto fail;
 424
 425         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 426                 /* FIXME: we need to do something here */
 427                 goto fail;
 428
 429         free(fds);
 430         *_pid = pid;
 431
 432         return 0;
 433
 434 fail:
 435         free(fds);
 436
 437         if (timeout)
 438                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 439
 440         return r;
 441 }
 442
 443 static void service_enter_dead(Service *s, bool success, bool allow_restart) {
 444         int r;
 445         assert(s);
 446
 447         if (!success)
 448                 s->failure = true;
 449
 450         if (allow_restart &&
 451             (s->restart == SERVICE_RESTART_ALWAYS ||
 452              (s->restart == SERVICE_RESTART_ON_SUCCESS && !s->failure))) {
 453
 454                 if ((r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch)) < 0)
 455                         goto fail;
 456
 457                 service_set_state(s, SERVICE_AUTO_RESTART);
 458         } else
 459                 service_set_state(s, s->failure ? SERVICE_MAINTAINANCE : SERVICE_DEAD);
 460
 461         return;
 462
 463 fail:
 464         log_warning("%s failed to run install restart timer: %s", unit_id(UNIT(s)), strerror(-r));
 465         service_enter_dead(s, false, false);
 466 }
 467
 468 static void service_enter_signal(Service *s, ServiceState state, bool success);
 469
 470 static void service_enter_stop_post(Service *s, bool success) {
 471         int r;
 472         assert(s);
 473
 474         if (!success)
 475                 s->failure = true;
 476
 477         if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST]))
 478                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 479                         goto fail;
 480
 481
 482         service_set_state(s, SERVICE_STOP_POST);
 483
 484         if (!s->control_command)
 485                 service_enter_dead(s, true, true);
 486
 487         return;
 488
 489 fail:
 490         log_warning("%s failed to run stop executable: %s", unit_id(UNIT(s)), strerror(-r));
 491         service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
 492 }
 493
 494 static void service_enter_signal(Service *s, ServiceState state, bool success) {
 495         int r;
 496         bool sent = false;
 497
 498         assert(s);
 499
 500         if (!success)
 501                 s->failure = true;
 502
 503         if (s->main_pid > 0 || s->control_pid > 0) {
 504                 int sig;
 505
 506                 sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
 507
 508                 r = 0;
 509                 if (s->main_pid > 0) {
 510                         if (kill(s->main_pid, sig) < 0 && errno != ESRCH)
 511                                 r = -errno;
 512                         else
 513                                 sent = true;
 514                 }
 515
 516                 if (s->control_pid > 0) {
 517                         if (kill(s->control_pid, sig) < 0 && errno != ESRCH)
 518                                 r = -errno;
 519                         else
 520                                 sent = true;
 521                 }
 522
 523                 if (r < 0)
 524                         goto fail;
 525         }
 526
 527         service_set_state(s, state);
 528
 529         if (s->main_pid <= 0 && s->control_pid <= 0)
 530                 service_enter_dead(s, true, true);
 531
 532         return;
 533
 534 fail:
 535         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
 536
 537         if (sent)  {
 538                 s->failure = true;
 539                 service_set_state(s, state);
 540         } else if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
 541                 service_enter_stop_post(s, false);
 542         else
 543                 service_enter_dead(s, false, true);
 544 }
 545
 546 static void service_enter_stop(Service *s, bool success) {
 547         int r;
 548         assert(s);
 549
 550         if (!success)
 551                 s->failure = true;
 552
 553         if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP]))
 554                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 555                         goto fail;
 556
 557         service_set_state(s, SERVICE_STOP);
 558
 559         if (!s->control_command)
 560                 service_enter_signal(s, SERVICE_STOP_SIGTERM, true);
 561
 562         return;
 563
 564 fail:
 565         log_warning("%s failed to run stop executable: %s", unit_id(UNIT(s)), strerror(-r));
 566         service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
 567 }
 568
 569 static void service_enter_start_post(Service *s) {
 570         int r;
 571         assert(s);
 572
 573         if ((s->control_command = s->exec_command[SERVICE_EXEC_START_POST]))
 574                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 575                         goto fail;
 576
 577
 578         service_set_state(s, SERVICE_START_POST);
 579
 580         if (!s->control_command)
 581                 service_set_state(s, SERVICE_RUNNING);
 582
 583         return;
 584
 585 fail:
 586         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 587         service_enter_stop(s, false);
 588 }
 589
 590 static void service_enter_start(Service *s) {
 591         pid_t pid;
 592         int r;
 593
 594         assert(s);
 595
 596         assert(s->exec_command[SERVICE_EXEC_START]);
 597         assert(!s->exec_command[SERVICE_EXEC_START]->command_next);
 598
 599         if ((r = service_spawn(s, s->exec_command[SERVICE_EXEC_START], s->type == SERVICE_FORKING, true, &pid)) < 0)
 600                 goto fail;
 601
 602         service_set_state(s, SERVICE_START);
 603
 604         if (s->type == SERVICE_SIMPLE) {
 605                 /* For simple services we immediately start
 606                  * the START_POST binaries. */
 607
 608                 s->main_pid = pid;
 609                 s->main_pid_known = true;
 610                 service_enter_start_post(s);
 611
 612         } else  if (s->type == SERVICE_FORKING) {
 613
 614                 /* For forking services we wait until the start
 615                  * process exited. */
 616
 617                 s->control_pid = pid;
 618                 s->control_command = s->exec_command[SERVICE_EXEC_START];
 619         } else
 620                 assert_not_reached("Unknown service type");
 621
 622         return;
 623
 624 fail:
 625         log_warning("%s failed to run start exectuable: %s", unit_id(UNIT(s)), strerror(-r));
 626         service_enter_stop(s, false);
 627 }
 628
 629 static void service_enter_start_pre(Service *s) {
 630         int r;
 631
 632         assert(s);
 633
 634         if ((s->control_command = s->exec_command[SERVICE_EXEC_START_PRE]))
 635                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 636                         goto fail;
 637
 638         service_set_state(s, SERVICE_START_PRE);
 639
 640         if (!s->control_command)
 641                 service_enter_start(s);
 642
 643         return;
 644
 645 fail:
 646         log_warning("%s failed to run start-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
 647         service_enter_dead(s, false, true);
 648 }
 649
 650 static void service_enter_restart(Service *s) {
 651         int r;
 652         assert(s);
 653
 654         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s), JOB_FAIL, false, NULL)) < 0)
 655                 goto fail;
 656
 657         log_debug("%s scheduled restart job.", unit_id(UNIT(s)));
 658         service_enter_dead(s, true, false);
 659         return;
 660
 661 fail:
 662
 663         log_warning("%s failed to schedule restart job: %s", unit_id(UNIT(s)), strerror(-r));
 664         service_enter_dead(s, false, false);
 665 }
 666
 667 static void service_enter_reload(Service *s) {
 668         int r;
 669
 670         assert(s);
 671
 672         if ((s->control_command = s->exec_command[SERVICE_EXEC_RELOAD]))
 673                 if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 674                         goto fail;
 675
 676         service_set_state(s, SERVICE_RELOAD);
 677
 678         if (!s->control_command)
 679                 service_set_state(s, SERVICE_RUNNING);
 680
 681         return;
 682
 683 fail:
 684         log_warning("%s failed to run reload executable: %s", unit_id(UNIT(s)), strerror(-r));
 685         service_enter_stop(s, false);
 686 }
 687
 688 static void service_run_next(Service *s, bool success) {
 689         int r;
 690
 691         assert(s);
 692         assert(s->control_command);
 693         assert(s->control_command->command_next);
 694
 695         if (!success)
 696                 s->failure = true;
 697
 698         s->control_command = s->control_command->command_next;
 699
 700         if ((r = service_spawn(s, s->control_command, true, false, &s->control_pid)) < 0)
 701                 goto fail;
 702
 703         return;
 704
 705 fail:
 706         log_warning("%s failed to run spawn next executable: %s", unit_id(UNIT(s)), strerror(-r));
 707
 708         if (s->state == SERVICE_STOP)
 709                 service_enter_stop_post(s, false);
 710         else if (s->state == SERVICE_STOP_POST)
 711                 service_enter_dead(s, false, true);
 712         else
 713                 service_enter_stop(s, false);
 714 }
 715
 716 static int service_start(Unit *u) {
 717         Service *s = SERVICE(u);
 718
 719         assert(s);
 720
 721         /* We cannot fulfill this request right now, try again later
 722          * please! */
 723         if (s->state == SERVICE_STOP ||
 724             s->state == SERVICE_STOP_SIGTERM ||
 725             s->state == SERVICE_STOP_SIGKILL ||
 726             s->state == SERVICE_STOP_POST ||
 727             s->state == SERVICE_FINAL_SIGTERM ||
 728             s->state == SERVICE_FINAL_SIGKILL)
 729                 return -EAGAIN;
 730
 731         /* Already on it! */
 732         if (s->state == SERVICE_START_PRE ||
 733             s->state == SERVICE_START ||
 734             s->state == SERVICE_START_POST)
 735                 return 0;
 736
 737         assert(s->state == SERVICE_DEAD || s->state == SERVICE_MAINTAINANCE || s->state == SERVICE_AUTO_RESTART);
 738
 739         /* Make sure we don't enter a busy loop of some kind. */
 740         if (!ratelimit_test(&s->ratelimit)) {
 741                 log_warning("%s start request repeated too quickly, refusing to start.", unit_id(u));
 742                 return -EAGAIN;
 743         }
 744
 745         s->failure = false;
 746         s->main_pid_known = false;
 747
 748         service_enter_start_pre(s);
 749         return 0;
 750 }
 751
 752 static int service_stop(Unit *u) {
 753         Service *s = SERVICE(u);
 754
 755         assert(s);
 756
 757         if (s->state == SERVICE_START_PRE ||
 758             s->state == SERVICE_START ||
 759             s->state == SERVICE_START_POST ||
 760             s->state == SERVICE_RELOAD)
 761                 return -EAGAIN;
 762
 763         if (s->state == SERVICE_AUTO_RESTART) {
 764                 service_set_state(s, SERVICE_DEAD);
 765                 return 0;
 766         }
 767
 768         assert(s->state == SERVICE_RUNNING);
 769
 770         service_enter_stop(s, true);
 771         return 0;
 772 }
 773
 774 static int service_reload(Unit *u) {
 775         Service *s = SERVICE(u);
 776
 777         assert(s);
 778
 779         assert(s->state == SERVICE_RUNNING);
 780
 781         service_enter_reload(s);
 782         return 0;
 783 }
 784
 785 static bool service_can_reload(Unit *u) {
 786         Service *s = SERVICE(u);
 787
 788         assert(s);
 789
 790         return !!s->exec_command[SERVICE_EXEC_RELOAD];
 791 }
 792
 793 static UnitActiveState service_active_state(Unit *u) {
 794         assert(u);
 795
 796         return state_translation_table[SERVICE(u)->state];
 797 }
 798
 799 static int main_pid_good(Service *s) {
 800         assert(s);
 801
 802         /* Returns 0 if the pid is dead, 1 if it is good, -1 if we
 803          * don't know */
 804
 805         /* If we know the pid file, then lets just check if it is
 806          * still valid */
 807         if (s->main_pid_known)
 808                 return s->main_pid > 0;
 809
 810         /* We don't know the pid */
 811         return -1;
 812 }
 813
 814 static bool control_pid_good(Service *s) {
 815         assert(s);
 816
 817         return s->control_pid > 0;
 818 }
 819
 820 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 821         Service *s = SERVICE(u);
 822         bool success;
 823
 824         assert(s);
 825         assert(pid >= 0);
 826
 827         success = code == CLD_EXITED && status == 0;
 828         s->failure = s->failure || !success;
 829
 830         if (s->main_pid == pid) {
 831
 832                 exec_status_fill(&s->main_exec_status, pid, code, status);
 833                 s->main_pid = 0;
 834
 835                 if (s->type == SERVICE_SIMPLE) {
 836                         assert(s->exec_command[SERVICE_EXEC_START]);
 837                         s->exec_command[SERVICE_EXEC_START]->exec_status = s->main_exec_status;
 838                 }
 839
 840                 log_debug("%s: main process exited, code=%s status=%i", unit_id(u), sigchld_code(code), status);
 841
 842                 /* The service exited, so the service is officially
 843                  * gone. */
 844
 845                 switch (s->state) {
 846
 847                 case SERVICE_START_POST:
 848                 case SERVICE_RELOAD:
 849                 case SERVICE_STOP:
 850                         /* Need to wait until the operation is
 851                          * done */
 852                         break;
 853
 854                 case SERVICE_RUNNING:
 855                         service_enter_stop(s, success);
 856                         break;
 857
 858                 case SERVICE_STOP_SIGTERM:
 859                 case SERVICE_STOP_SIGKILL:
 860
 861                         if (!control_pid_good(s))
 862                                 service_enter_stop_post(s, success);
 863
 864                         /* If there is still a control process, wait for that first */
 865                         break;
 866
 867                 default:
 868                         assert_not_reached("Uh, main process died at wrong time.");
 869                 }
 870
 871         } else if (s->control_pid == pid) {
 872                 assert(s->control_command);
 873
 874                 exec_status_fill(&s->control_command->exec_status, pid, code, status);
 875                 s->control_pid = 0;
 876
 877                 log_debug("%s: control process exited, code=%s status=%i", unit_id(u), sigchld_code(code), status);
 878
 879                 /* If we are shutting things down anyway we
 880                  * don't care about failing commands. */
 881
 882                 if (s->control_command->command_next &&
 883                     (success || (s->state == SERVICE_EXEC_STOP || s->state == SERVICE_EXEC_STOP_POST)))
 884
 885                         /* There is another command to *
 886                          * execute, so let's do that. */
 887
 888                         service_run_next(s, success);
 889
 890                 else {
 891                         /* No further commands for this step, so let's
 892                          * figure out what to do next */
 893
 894                         log_debug("%s got final SIGCHLD for state %s", unit_id(u), state_string_table[s->state]);
 895
 896                         switch (s->state) {
 897
 898                         case SERVICE_START_PRE:
 899                                 if (success)
 900                                         service_enter_start(s);
 901                                 else
 902                                         service_enter_stop(s, false);
 903                                 break;
 904
 905                         case SERVICE_START:
 906                                 assert(s->type == SERVICE_FORKING);
 907
 908                                 /* Let's try to load the pid
 909                                  * file here if we can. We
 910                                  * ignore the return value,
 911                                  * since the PID file might
 912                                  * actually be created by a
 913                                  * START_POST script */
 914
 915                                 if (success) {
 916                                         if (s->pid_file)
 917                                                 service_load_pid_file(s);
 918
 919                                         service_enter_start_post(s);
 920                                 } else
 921                                         service_enter_stop(s, false);
 922
 923                                 break;
 924
 925                         case SERVICE_START_POST:
 926                                 if (success && s->pid_file && !s->main_pid_known) {
 927                                         int r;
 928
 929                                         /* Hmm, let's see if we can
 930                                          * load the pid now after the
 931                                          * start-post scripts got
 932                                          * executed. */
 933
 934                                         if ((r = service_load_pid_file(s)) < 0)
 935                                                 log_warning("%s: failed to load PID file %s: %s", unit_id(UNIT(s)), s->pid_file, strerror(-r));
 936                                 }
 937
 938                                 /* Fall through */
 939
 940                         case SERVICE_RELOAD:
 941                                 if (success) {
 942                                         if (main_pid_good(s) != 0)
 943                                                 service_set_state(s, SERVICE_RUNNING);
 944                                         else
 945                                                 service_enter_stop(s, true);
 946                                 } else
 947                                         service_enter_stop(s, false);
 948
 949                                 break;
 950
 951                         case SERVICE_STOP:
 952                                 if (main_pid_good(s) > 0)
 953                                         /* Still not dead and we know the PID? Let's go hunting. */
 954                                         service_enter_signal(s, SERVICE_STOP_SIGTERM, success);
 955                                 else
 956                                         service_enter_stop_post(s, success);
 957                                 break;
 958
 959                         case SERVICE_STOP_SIGTERM:
 960                         case SERVICE_STOP_SIGKILL:
 961                                 if (main_pid_good(s) <= 0)
 962                                         service_enter_stop_post(s, success);
 963
 964                                 /* If there is still a service
 965                                  * process around, wait until
 966                                  * that one quit, too */
 967                                 break;
 968
 969                         case SERVICE_STOP_POST:
 970                         case SERVICE_FINAL_SIGTERM:
 971                         case SERVICE_FINAL_SIGKILL:
 972                                 service_enter_dead(s, success, true);
 973                                 break;
 974
 975                         default:
 976                                 assert_not_reached("Uh, control process died at wrong time.");
 977                         }
 978                 }
 979         } else
 980                 assert_not_reached("Got SIGCHLD for unkown PID");
 981 }
 982
 983 static void service_timer_event(Unit *u, uint64_t elapsed, Watch* w) {
 984         Service *s = SERVICE(u);
 985
 986         assert(s);
 987         assert(elapsed == 1);
 988
 989         assert(w == &s->timer_watch);
 990
 991         switch (s->state) {
 992
 993         case SERVICE_START_PRE:
 994         case SERVICE_START:
 995         case SERVICE_START_POST:
 996         case SERVICE_RELOAD:
 997                 log_warning("%s operation timed out. Stopping.", unit_id(u));
 998                 service_enter_stop(s, false);
 999                 break;
1000
1001         case SERVICE_STOP:
1002                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
1003                 service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
1004                 break;
1005
1006         case SERVICE_STOP_SIGTERM:
1007                 log_warning("%s stopping timed out. Killing.", unit_id(u));
1008                 service_enter_signal(s, SERVICE_STOP_SIGKILL, false);
1009                 break;
1010
1011         case SERVICE_STOP_SIGKILL:
1012                 /* Uh, wie sent a SIGKILL and it is still not gone?
1013                  * Must be something we cannot kill, so let's just be
1014                  * weirded out and continue */
1015
1016                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
1017                 service_enter_stop_post(s, false);
1018                 break;
1019
1020         case SERVICE_STOP_POST:
1021                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
1022                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
1023                 break;
1024
1025         case SERVICE_FINAL_SIGTERM:
1026                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
1027                 service_enter_signal(s, SERVICE_FINAL_SIGKILL, false);
1028                 break;
1029
1030         case SERVICE_FINAL_SIGKILL:
1031                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
1032                 service_enter_dead(s, false, true);
1033                 break;
1034
1035         case SERVICE_AUTO_RESTART:
1036                 log_debug("%s holdoff time over, scheduling restart.", unit_id(u));
1037                 service_enter_restart(s);
1038                 break;
1039
1040         default:
1041                 assert_not_reached("Timeout at wrong time.");
1042         }
1043 }
1044
1045 const UnitVTable service_vtable = {
1046         .suffix = ".service",
1047
1048         .init = service_init,
1049         .done = service_done,
1050
1051         .dump = service_dump,
1052
1053         .start = service_start,
1054         .stop = service_stop,
1055         .reload = service_reload,
1056
1057         .can_reload = service_can_reload,
1058
1059         .active_state = service_active_state,
1060
1061         .sigchld_event = service_sigchld_event,
1062         .timer_event = service_timer_event,
1063 };