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