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yay, we can start socket units
[elogind.git] / 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, "%sā†’ %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 ā†’ %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 };