chiark / gitweb /
service: rename StartLimitAction enum to FailureAction
[elogind.git] / src / core / service.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4   This file is part of systemd.
5
6   Copyright 2010 Lennart Poettering
7
8   systemd is free software; you can redistribute it and/or modify it
9   under the terms of the GNU Lesser General Public License as published by
10   the Free Software Foundation; either version 2.1 of the License, or
11   (at your option) any later version.
12
13   systemd is distributed in the hope that it will be useful, but
14   WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16   Lesser General Public License for more details.
17
18   You should have received a copy of the GNU Lesser General Public License
19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <errno.h>
23 #include <signal.h>
24 #include <dirent.h>
25 #include <unistd.h>
26 #include <sys/reboot.h>
27 #include <linux/reboot.h>
28 #include <sys/syscall.h>
29
30 #include "manager.h"
31 #include "unit.h"
32 #include "service.h"
33 #include "load-fragment.h"
34 #include "load-dropin.h"
35 #include "log.h"
36 #include "strv.h"
37 #include "unit-name.h"
38 #include "unit-printf.h"
39 #include "dbus-service.h"
40 #include "special.h"
41 #include "exit-status.h"
42 #include "def.h"
43 #include "path-util.h"
44 #include "util.h"
45 #include "utf8.h"
46 #include "env-util.h"
47 #include "fileio.h"
48 #include "bus-error.h"
49 #include "bus-util.h"
50
51 #ifdef HAVE_SYSV_COMPAT
52
53 #define DEFAULT_SYSV_TIMEOUT_USEC (5*USEC_PER_MINUTE)
54
55 typedef enum RunlevelType {
56         RUNLEVEL_UP,
57         RUNLEVEL_DOWN
58 } RunlevelType;
59
60 static const struct {
61         const char *path;
62         const char *target;
63         const RunlevelType type;
64 } rcnd_table[] = {
65         /* Standard SysV runlevels for start-up */
66         { "rc1.d",  SPECIAL_RESCUE_TARGET,    RUNLEVEL_UP },
67         { "rc2.d",  SPECIAL_RUNLEVEL2_TARGET, RUNLEVEL_UP },
68         { "rc3.d",  SPECIAL_RUNLEVEL3_TARGET, RUNLEVEL_UP },
69         { "rc4.d",  SPECIAL_RUNLEVEL4_TARGET, RUNLEVEL_UP },
70         { "rc5.d",  SPECIAL_RUNLEVEL5_TARGET, RUNLEVEL_UP },
71
72         /* Standard SysV runlevels for shutdown */
73         { "rc0.d",  SPECIAL_POWEROFF_TARGET,  RUNLEVEL_DOWN },
74         { "rc6.d",  SPECIAL_REBOOT_TARGET,    RUNLEVEL_DOWN }
75
76         /* Note that the order here matters, as we read the
77            directories in this order, and we want to make sure that
78            sysv_start_priority is known when we first load the
79            unit. And that value we only know from S links. Hence
80            UP must be read before DOWN */
81 };
82
83 #define RUNLEVELS_UP "12345"
84 #endif
85
86 static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
87         [SERVICE_DEAD] = UNIT_INACTIVE,
88         [SERVICE_START_PRE] = UNIT_ACTIVATING,
89         [SERVICE_START] = UNIT_ACTIVATING,
90         [SERVICE_START_POST] = UNIT_ACTIVATING,
91         [SERVICE_RUNNING] = UNIT_ACTIVE,
92         [SERVICE_EXITED] = UNIT_ACTIVE,
93         [SERVICE_RELOAD] = UNIT_RELOADING,
94         [SERVICE_STOP] = UNIT_DEACTIVATING,
95         [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
96         [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
97         [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
98         [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
99         [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
100         [SERVICE_FAILED] = UNIT_FAILED,
101         [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
102 };
103
104 /* For Type=idle we never want to delay any other jobs, hence we
105  * consider idle jobs active as soon as we start working on them */
106 static const UnitActiveState state_translation_table_idle[_SERVICE_STATE_MAX] = {
107         [SERVICE_DEAD] = UNIT_INACTIVE,
108         [SERVICE_START_PRE] = UNIT_ACTIVE,
109         [SERVICE_START] = UNIT_ACTIVE,
110         [SERVICE_START_POST] = UNIT_ACTIVE,
111         [SERVICE_RUNNING] = UNIT_ACTIVE,
112         [SERVICE_EXITED] = UNIT_ACTIVE,
113         [SERVICE_RELOAD] = UNIT_RELOADING,
114         [SERVICE_STOP] = UNIT_DEACTIVATING,
115         [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
116         [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
117         [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
118         [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
119         [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
120         [SERVICE_FAILED] = UNIT_FAILED,
121         [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
122 };
123
124 static int service_dispatch_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
125 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
126 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata);
127
128 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f);
129
130 static void service_init(Unit *u) {
131         Service *s = SERVICE(u);
132
133         assert(u);
134         assert(u->load_state == UNIT_STUB);
135
136         s->timeout_start_usec = u->manager->default_timeout_start_usec;
137         s->timeout_stop_usec = u->manager->default_timeout_stop_usec;
138         s->restart_usec = u->manager->default_restart_usec;
139         s->type = _SERVICE_TYPE_INVALID;
140
141 #ifdef HAVE_SYSV_COMPAT
142         s->sysv_start_priority = -1;
143         s->sysv_start_priority_from_rcnd = -1;
144 #endif
145         s->socket_fd = -1;
146         s->guess_main_pid = true;
147
148         RATELIMIT_INIT(s->start_limit, u->manager->default_start_limit_interval, u->manager->default_start_limit_burst);
149
150         s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
151 }
152
153 static void service_unwatch_control_pid(Service *s) {
154         assert(s);
155
156         if (s->control_pid <= 0)
157                 return;
158
159         unit_unwatch_pid(UNIT(s), s->control_pid);
160         s->control_pid = 0;
161 }
162
163 static void service_unwatch_main_pid(Service *s) {
164         assert(s);
165
166         if (s->main_pid <= 0)
167                 return;
168
169         unit_unwatch_pid(UNIT(s), s->main_pid);
170         s->main_pid = 0;
171 }
172
173 static void service_unwatch_pid_file(Service *s) {
174         if (!s->pid_file_pathspec)
175                 return;
176
177         log_debug_unit(UNIT(s)->id, "Stopping watch for %s's PID file %s",
178                        UNIT(s)->id, s->pid_file_pathspec->path);
179         path_spec_unwatch(s->pid_file_pathspec);
180         path_spec_done(s->pid_file_pathspec);
181         free(s->pid_file_pathspec);
182         s->pid_file_pathspec = NULL;
183 }
184
185 static int service_set_main_pid(Service *s, pid_t pid) {
186         pid_t ppid;
187
188         assert(s);
189
190         if (pid <= 1)
191                 return -EINVAL;
192
193         if (pid == getpid())
194                 return -EINVAL;
195
196         if (s->main_pid == pid && s->main_pid_known)
197                 return 0;
198
199         if (s->main_pid != pid) {
200                 service_unwatch_main_pid(s);
201                 exec_status_start(&s->main_exec_status, pid);
202         }
203
204         s->main_pid = pid;
205         s->main_pid_known = true;
206
207         if (get_parent_of_pid(pid, &ppid) >= 0 && ppid != getpid()) {
208                 log_warning_unit(UNIT(s)->id,
209                                  "%s: Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.",
210                                  UNIT(s)->id, pid);
211
212                 s->main_pid_alien = true;
213         } else
214                 s->main_pid_alien = false;
215
216         return 0;
217 }
218
219 static void service_close_socket_fd(Service *s) {
220         assert(s);
221
222         if (s->socket_fd < 0)
223                 return;
224
225         s->socket_fd = safe_close(s->socket_fd);
226 }
227
228 static void service_connection_unref(Service *s) {
229         assert(s);
230
231         if (!UNIT_ISSET(s->accept_socket))
232                 return;
233
234         socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket)));
235         unit_ref_unset(&s->accept_socket);
236 }
237
238 static void service_stop_watchdog(Service *s) {
239         assert(s);
240
241         s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source);
242         s->watchdog_timestamp = DUAL_TIMESTAMP_NULL;
243 }
244
245 static void service_start_watchdog(Service *s) {
246         int r;
247
248         assert(s);
249
250         if (s->watchdog_usec <= 0)
251                 return;
252
253         if (s->watchdog_event_source) {
254                 r = sd_event_source_set_time(s->watchdog_event_source, s->watchdog_timestamp.monotonic + s->watchdog_usec);
255                 if (r < 0) {
256                         log_warning_unit(UNIT(s)->id, "%s failed to reset watchdog timer: %s", UNIT(s)->id, strerror(-r));
257                         return;
258                 }
259
260                 r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT);
261         } else {
262                 r = sd_event_add_time(
263                                 UNIT(s)->manager->event,
264                                 &s->watchdog_event_source,
265                                 CLOCK_MONOTONIC,
266                                 s->watchdog_timestamp.monotonic + s->watchdog_usec, 0,
267                                 service_dispatch_watchdog, s);
268                 if (r < 0) {
269                         log_warning_unit(UNIT(s)->id, "%s failed to add watchdog timer: %s", UNIT(s)->id, strerror(-r));
270                         return;
271                 }
272
273                 /* Let's process everything else which might be a sign
274                  * of living before we consider a service died. */
275                 r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE);
276         }
277
278         if (r < 0)
279                 log_warning_unit(UNIT(s)->id, "%s failed to install watchdog timer: %s", UNIT(s)->id, strerror(-r));
280 }
281
282 static void service_reset_watchdog(Service *s) {
283         assert(s);
284
285         dual_timestamp_get(&s->watchdog_timestamp);
286         service_start_watchdog(s);
287 }
288
289 static void service_done(Unit *u) {
290         Service *s = SERVICE(u);
291
292         assert(s);
293
294         free(s->pid_file);
295         s->pid_file = NULL;
296
297 #ifdef HAVE_SYSV_COMPAT
298         free(s->sysv_runlevels);
299         s->sysv_runlevels = NULL;
300 #endif
301
302         free(s->status_text);
303         s->status_text = NULL;
304
305         free(s->reboot_arg);
306         s->reboot_arg = NULL;
307
308         s->exec_runtime = exec_runtime_unref(s->exec_runtime);
309         exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
310         s->control_command = NULL;
311         s->main_command = NULL;
312
313         set_free(s->restart_ignore_status.code);
314         s->restart_ignore_status.code = NULL;
315         set_free(s->restart_ignore_status.signal);
316         s->restart_ignore_status.signal = NULL;
317
318         set_free(s->success_status.code);
319         s->success_status.code = NULL;
320         set_free(s->success_status.signal);
321         s->success_status.signal = NULL;
322
323         /* This will leak a process, but at least no memory or any of
324          * our resources */
325         service_unwatch_main_pid(s);
326         service_unwatch_control_pid(s);
327         service_unwatch_pid_file(s);
328
329         if (s->bus_name)  {
330                 unit_unwatch_bus_name(u, s->bus_name);
331                 free(s->bus_name);
332                 s->bus_name = NULL;
333         }
334
335         service_close_socket_fd(s);
336         service_connection_unref(s);
337
338         unit_ref_unset(&s->accept_socket);
339
340         service_stop_watchdog(s);
341
342         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
343 }
344
345 static int service_arm_timer(Service *s, usec_t usec) {
346         int r;
347
348         assert(s);
349
350         if (s->timer_event_source) {
351                 r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + usec);
352                 if (r < 0)
353                         return r;
354
355                 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
356         }
357
358         return sd_event_add_time(
359                         UNIT(s)->manager->event,
360                         &s->timer_event_source,
361                         CLOCK_MONOTONIC,
362                         now(CLOCK_MONOTONIC) + usec, 0,
363                         service_dispatch_timer, s);
364 }
365
366 #ifdef HAVE_SYSV_COMPAT
367 static char *sysv_translate_name(const char *name) {
368         char *r;
369
370         r = new(char, strlen(name) + strlen(".service") + 1);
371         if (!r)
372                 return NULL;
373
374         if (endswith(name, ".sh"))
375                 /* Drop .sh suffix */
376                 strcpy(stpcpy(r, name) - 3, ".service");
377         else
378                 /* Normal init script name */
379                 strcpy(stpcpy(r, name), ".service");
380
381         return r;
382 }
383
384 static int sysv_translate_facility(const char *name, const char *filename, char **_r) {
385
386         /* We silently ignore the $ prefix here. According to the LSB
387          * spec it simply indicates whether something is a
388          * standardized name or a distribution-specific one. Since we
389          * just follow what already exists and do not introduce new
390          * uses or names we don't care who introduced a new name. */
391
392         static const char * const table[] = {
393                 /* LSB defined facilities */
394                 "local_fs",             NULL,
395                 "network",              SPECIAL_NETWORK_TARGET,
396                 "named",                SPECIAL_NSS_LOOKUP_TARGET,
397                 "portmap",              SPECIAL_RPCBIND_TARGET,
398                 "remote_fs",            SPECIAL_REMOTE_FS_TARGET,
399                 "syslog",               NULL,
400                 "time",                 SPECIAL_TIME_SYNC_TARGET,
401         };
402
403         unsigned i;
404         char *r;
405         const char *n;
406
407         assert(name);
408         assert(_r);
409
410         n = *name == '$' ? name + 1 : name;
411
412         for (i = 0; i < ELEMENTSOF(table); i += 2) {
413
414                 if (!streq(table[i], n))
415                         continue;
416
417                 if (!table[i+1])
418                         return 0;
419
420                 r = strdup(table[i+1]);
421                 if (!r)
422                         return log_oom();
423
424                 goto finish;
425         }
426
427         /* If we don't know this name, fallback heuristics to figure
428          * out whether something is a target or a service alias. */
429
430         if (*name == '$') {
431                 if (!unit_prefix_is_valid(n))
432                         return -EINVAL;
433
434                 /* Facilities starting with $ are most likely targets */
435                 r = unit_name_build(n, NULL, ".target");
436         } else if (filename && streq(name, filename))
437                 /* Names equaling the file name of the services are redundant */
438                 return 0;
439         else
440                 /* Everything else we assume to be normal service names */
441                 r = sysv_translate_name(n);
442
443         if (!r)
444                 return -ENOMEM;
445
446 finish:
447         *_r = r;
448
449         return 1;
450 }
451
452 static int sysv_fix_order(Service *s) {
453         Unit *other;
454         int r;
455
456         assert(s);
457
458         if (s->sysv_start_priority < 0)
459                 return 0;
460
461         /* For each pair of services where at least one lacks a LSB
462          * header, we use the start priority value to order things. */
463
464         LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_SERVICE]) {
465                 Service *t;
466                 UnitDependency d;
467                 bool special_s, special_t;
468
469                 t = SERVICE(other);
470
471                 if (s == t)
472                         continue;
473
474                 if (UNIT(t)->load_state != UNIT_LOADED)
475                         continue;
476
477                 if (t->sysv_start_priority < 0)
478                         continue;
479
480                 /* If both units have modern headers we don't care
481                  * about the priorities */
482                 if ((UNIT(s)->fragment_path || s->sysv_has_lsb) &&
483                     (UNIT(t)->fragment_path || t->sysv_has_lsb))
484                         continue;
485
486                 special_s = s->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, s->sysv_runlevels);
487                 special_t = t->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, t->sysv_runlevels);
488
489                 if (special_t && !special_s)
490                         d = UNIT_AFTER;
491                 else if (special_s && !special_t)
492                         d = UNIT_BEFORE;
493                 else if (t->sysv_start_priority < s->sysv_start_priority)
494                         d = UNIT_AFTER;
495                 else if (t->sysv_start_priority > s->sysv_start_priority)
496                         d = UNIT_BEFORE;
497                 else
498                         continue;
499
500                 /* FIXME: Maybe we should compare the name here lexicographically? */
501
502                 if ((r = unit_add_dependency(UNIT(s), d, UNIT(t), true)) < 0)
503                         return r;
504         }
505
506         return 0;
507 }
508
509 static ExecCommand *exec_command_new(const char *path, const char *arg1) {
510         ExecCommand *c;
511
512         if (!(c = new0(ExecCommand, 1)))
513                 return NULL;
514
515         if (!(c->path = strdup(path))) {
516                 free(c);
517                 return NULL;
518         }
519
520         if (!(c->argv = strv_new(path, arg1, NULL))) {
521                 free(c->path);
522                 free(c);
523                 return NULL;
524         }
525
526         return c;
527 }
528
529 static int sysv_exec_commands(Service *s, const bool supports_reload) {
530         ExecCommand *c;
531
532         assert(s);
533         assert(s->is_sysv);
534         assert(UNIT(s)->source_path);
535
536         c = exec_command_new(UNIT(s)->source_path, "start");
537         if (!c)
538                 return -ENOMEM;
539         exec_command_append_list(s->exec_command+SERVICE_EXEC_START, c);
540
541         c = exec_command_new(UNIT(s)->source_path, "stop");
542         if (!c)
543                 return -ENOMEM;
544         exec_command_append_list(s->exec_command+SERVICE_EXEC_STOP, c);
545
546         if (supports_reload) {
547                 c = exec_command_new(UNIT(s)->source_path, "reload");
548                 if (!c)
549                         return -ENOMEM;
550                 exec_command_append_list(s->exec_command+SERVICE_EXEC_RELOAD, c);
551         }
552
553         return 0;
554 }
555
556 static bool usage_contains_reload(const char *line) {
557         return (strcasestr(line, "{reload|") ||
558                 strcasestr(line, "{reload}") ||
559                 strcasestr(line, "{reload\"") ||
560                 strcasestr(line, "|reload|") ||
561                 strcasestr(line, "|reload}") ||
562                 strcasestr(line, "|reload\""));
563 }
564
565 static int service_load_sysv_path(Service *s, const char *path) {
566         FILE *f;
567         Unit *u;
568         unsigned line = 0;
569         int r;
570         enum {
571                 NORMAL,
572                 DESCRIPTION,
573                 LSB,
574                 LSB_DESCRIPTION,
575                 USAGE_CONTINUATION
576         } state = NORMAL;
577         char *short_description = NULL, *long_description = NULL, *chkconfig_description = NULL, *description;
578         struct stat st;
579         bool supports_reload = false;
580
581         assert(s);
582         assert(path);
583
584         u = UNIT(s);
585
586         f = fopen(path, "re");
587         if (!f) {
588                 r = errno == ENOENT ? 0 : -errno;
589                 goto finish;
590         }
591
592         if (fstat(fileno(f), &st) < 0) {
593                 r = -errno;
594                 goto finish;
595         }
596
597         free(u->source_path);
598         u->source_path = strdup(path);
599         if (!u->source_path) {
600                 r = -ENOMEM;
601                 goto finish;
602         }
603         u->source_mtime = timespec_load(&st.st_mtim);
604
605         if (null_or_empty(&st)) {
606                 u->load_state = UNIT_MASKED;
607                 r = 0;
608                 goto finish;
609         }
610
611         s->is_sysv = true;
612
613         while (!feof(f)) {
614                 char l[LINE_MAX], *t;
615
616                 if (!fgets(l, sizeof(l), f)) {
617                         if (feof(f))
618                                 break;
619
620                         r = -errno;
621                         log_error_unit(u->id,
622                                        "Failed to read configuration file '%s': %s",
623                                        path, strerror(-r));
624                         goto finish;
625                 }
626
627                 line++;
628
629                 t = strstrip(l);
630                 if (*t != '#') {
631                         /* Try to figure out whether this init script supports
632                          * the reload operation. This heuristic looks for
633                          * "Usage" lines which include the reload option. */
634                         if ( state == USAGE_CONTINUATION ||
635                             (state == NORMAL && strcasestr(t, "usage"))) {
636                                 if (usage_contains_reload(t)) {
637                                         supports_reload = true;
638                                         state = NORMAL;
639                                 } else if (t[strlen(t)-1] == '\\')
640                                         state = USAGE_CONTINUATION;
641                                 else
642                                         state = NORMAL;
643                         }
644
645                         continue;
646                 }
647
648                 if (state == NORMAL && streq(t, "### BEGIN INIT INFO")) {
649                         state = LSB;
650                         s->sysv_has_lsb = true;
651                         continue;
652                 }
653
654                 if ((state == LSB_DESCRIPTION || state == LSB) && streq(t, "### END INIT INFO")) {
655                         state = NORMAL;
656                         continue;
657                 }
658
659                 t++;
660                 t += strspn(t, WHITESPACE);
661
662                 if (state == NORMAL) {
663
664                         /* Try to parse Red Hat style chkconfig headers */
665
666                         if (startswith_no_case(t, "chkconfig:")) {
667                                 int start_priority;
668                                 char runlevels[16], *k;
669
670                                 state = NORMAL;
671
672                                 if (sscanf(t+10, "%15s %i %*i", runlevels, &start_priority) != 2) {
673                                         log_warning_unit(u->id, "[%s:%u] Failed to parse chkconfig line. Ignoring.", path, line);
674                                         continue;
675                                 }
676
677                                 /* A start priority gathered from the
678                                  * symlink farms is preferred over the
679                                  * data from the LSB header. */
680                                 if (start_priority < 0 || start_priority > 99)
681                                         log_warning_unit(u->id, "[%s:%u] Start priority out of range. Ignoring.", path, line);
682                                 else
683                                         log_debug_unit(u->id, "[%s:%u] Ignoring start priority set in the chkconfig file.", path, line);
684
685                                 char_array_0(runlevels);
686                                 k = delete_chars(runlevels, WHITESPACE "-");
687                                 if (k[0]) {
688                                         char *d;
689
690                                         d = strdup(k);
691                                         if (!d) {
692                                                 r = -ENOMEM;
693                                                 goto finish;
694                                         }
695
696                                         free(s->sysv_runlevels);
697                                         s->sysv_runlevels = d;
698                                 }
699
700                         } else if (startswith_no_case(t, "description:")) {
701
702                                 size_t k = strlen(t);
703                                 char *d;
704                                 const char *j;
705
706                                 if (t[k-1] == '\\') {
707                                         state = DESCRIPTION;
708                                         t[k-1] = 0;
709                                 }
710
711                                 if ((j = strstrip(t+12)) && *j) {
712                                         if (!(d = strdup(j))) {
713                                                 r = -ENOMEM;
714                                                 goto finish;
715                                         }
716                                 } else
717                                         d = NULL;
718
719                                 free(chkconfig_description);
720                                 chkconfig_description = d;
721
722                         } else if (startswith_no_case(t, "pidfile:")) {
723
724                                 char *fn;
725
726                                 state = NORMAL;
727
728                                 fn = strstrip(t+8);
729                                 if (!path_is_absolute(fn)) {
730                                         log_warning_unit(u->id,
731                                                          "[%s:%u] PID file not absolute. Ignoring.",
732                                                          path, line);
733                                         continue;
734                                 }
735
736                                 if (!(fn = strdup(fn))) {
737                                         r = -ENOMEM;
738                                         goto finish;
739                                 }
740
741                                 free(s->pid_file);
742                                 s->pid_file = fn;
743                         }
744
745                 } else if (state == DESCRIPTION) {
746
747                         /* Try to parse Red Hat style description
748                          * continuation */
749
750                         size_t k = strlen(t);
751                         char *j;
752
753                         if (t[k-1] == '\\')
754                                 t[k-1] = 0;
755                         else
756                                 state = NORMAL;
757
758                         if ((j = strstrip(t)) && *j) {
759                                 char *d = NULL;
760
761                                 if (chkconfig_description)
762                                         d = strjoin(chkconfig_description, " ", j, NULL);
763                                 else
764                                         d = strdup(j);
765
766                                 if (!d) {
767                                         r = -ENOMEM;
768                                         goto finish;
769                                 }
770
771                                 free(chkconfig_description);
772                                 chkconfig_description = d;
773                         }
774
775                 } else if (state == LSB || state == LSB_DESCRIPTION) {
776
777                         if (startswith_no_case(t, "Provides:")) {
778                                 char *i, *w;
779                                 size_t z;
780
781                                 state = LSB;
782
783                                 FOREACH_WORD_QUOTED(w, z, t+9, i) {
784                                         char *n, *m;
785
786                                         if (!(n = strndup(w, z))) {
787                                                 r = -ENOMEM;
788                                                 goto finish;
789                                         }
790
791                                         r = sysv_translate_facility(n, basename(path), &m);
792                                         free(n);
793
794                                         if (r < 0)
795                                                 goto finish;
796
797                                         if (r == 0)
798                                                 continue;
799
800                                         if (unit_name_to_type(m) == UNIT_SERVICE)
801                                                 r = unit_merge_by_name(u, m);
802                                         else
803                                                 /* NB: SysV targets
804                                                  * which are provided
805                                                  * by a service are
806                                                  * pulled in by the
807                                                  * services, as an
808                                                  * indication that the
809                                                  * generic service is
810                                                  * now available. This
811                                                  * is strictly
812                                                  * one-way. The
813                                                  * targets do NOT pull
814                                                  * in the SysV
815                                                  * services! */
816                                                 r = unit_add_two_dependencies_by_name(u, UNIT_BEFORE, UNIT_WANTS, m, NULL, true);
817
818                                         if (r < 0)
819                                                 log_error_unit(u->id,
820                                                                "[%s:%u] Failed to add LSB Provides name %s, ignoring: %s",
821                                                                path, line, m, strerror(-r));
822
823                                         free(m);
824                                 }
825
826                         } else if (startswith_no_case(t, "Required-Start:") ||
827                                    startswith_no_case(t, "Should-Start:") ||
828                                    startswith_no_case(t, "X-Start-Before:") ||
829                                    startswith_no_case(t, "X-Start-After:")) {
830                                 char *i, *w;
831                                 size_t z;
832
833                                 state = LSB;
834
835                                 FOREACH_WORD_QUOTED(w, z, strchr(t, ':')+1, i) {
836                                         char *n, *m;
837
838                                         if (!(n = strndup(w, z))) {
839                                                 r = -ENOMEM;
840                                                 goto finish;
841                                         }
842
843                                         r = sysv_translate_facility(n, basename(path), &m);
844                                         if (r < 0) {
845                                                 log_error_unit(u->id,
846                                                                "[%s:%u] Failed to translate LSB dependency %s, ignoring: %s",
847                                                                path, line, n, strerror(-r));
848                                                 free(n);
849                                                 continue;
850                                         }
851
852                                         free(n);
853
854                                         if (r == 0)
855                                                 continue;
856
857                                         r = unit_add_dependency_by_name(u, startswith_no_case(t, "X-Start-Before:") ? UNIT_BEFORE : UNIT_AFTER, m, NULL, true);
858
859                                         if (r < 0)
860                                                 log_error_unit(u->id, "[%s:%u] Failed to add dependency on %s, ignoring: %s",
861                                                                path, line, m, strerror(-r));
862
863                                         free(m);
864                                 }
865                         } else if (startswith_no_case(t, "Default-Start:")) {
866                                 char *k, *d;
867
868                                 state = LSB;
869
870                                 k = delete_chars(t+14, WHITESPACE "-");
871
872                                 if (k[0] != 0) {
873                                         if (!(d = strdup(k))) {
874                                                 r = -ENOMEM;
875                                                 goto finish;
876                                         }
877
878                                         free(s->sysv_runlevels);
879                                         s->sysv_runlevels = d;
880                                 }
881
882                         } else if (startswith_no_case(t, "Description:")) {
883                                 char *d, *j;
884
885                                 state = LSB_DESCRIPTION;
886
887                                 if ((j = strstrip(t+12)) && *j) {
888                                         if (!(d = strdup(j))) {
889                                                 r = -ENOMEM;
890                                                 goto finish;
891                                         }
892                                 } else
893                                         d = NULL;
894
895                                 free(long_description);
896                                 long_description = d;
897
898                         } else if (startswith_no_case(t, "Short-Description:")) {
899                                 char *d, *j;
900
901                                 state = LSB;
902
903                                 if ((j = strstrip(t+18)) && *j) {
904                                         if (!(d = strdup(j))) {
905                                                 r = -ENOMEM;
906                                                 goto finish;
907                                         }
908                                 } else
909                                         d = NULL;
910
911                                 free(short_description);
912                                 short_description = d;
913
914                         } else if (state == LSB_DESCRIPTION) {
915
916                                 if (startswith(l, "#\t") || startswith(l, "#  ")) {
917                                         char *j;
918
919                                         if ((j = strstrip(t)) && *j) {
920                                                 char *d = NULL;
921
922                                                 if (long_description)
923                                                         d = strjoin(long_description, " ", t, NULL);
924                                                 else
925                                                         d = strdup(j);
926
927                                                 if (!d) {
928                                                         r = -ENOMEM;
929                                                         goto finish;
930                                                 }
931
932                                                 free(long_description);
933                                                 long_description = d;
934                                         }
935
936                                 } else
937                                         state = LSB;
938                         }
939                 }
940         }
941
942         if ((r = sysv_exec_commands(s, supports_reload)) < 0)
943                 goto finish;
944
945         if (s->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, s->sysv_runlevels)) {
946                 /* If there a runlevels configured for this service
947                  * but none of the standard ones, then we assume this
948                  * is some special kind of service (which might be
949                  * needed for early boot) and don't create any links
950                  * to it. */
951
952                 UNIT(s)->default_dependencies = false;
953
954                 /* Don't timeout special services during boot (like fsck) */
955                 s->timeout_start_usec = 0;
956                 s->timeout_stop_usec = 0;
957         } else {
958                 s->timeout_start_usec = DEFAULT_SYSV_TIMEOUT_USEC;
959                 s->timeout_stop_usec = DEFAULT_SYSV_TIMEOUT_USEC;
960         }
961
962         /* Special setting for all SysV services */
963         s->type = SERVICE_FORKING;
964         s->remain_after_exit = !s->pid_file;
965         s->guess_main_pid = false;
966         s->restart = SERVICE_RESTART_NO;
967         s->exec_context.ignore_sigpipe = false;
968         s->kill_context.kill_mode = KILL_PROCESS;
969
970         /* We use the long description only if
971          * no short description is set. */
972
973         if (short_description)
974                 description = short_description;
975         else if (chkconfig_description)
976                 description = chkconfig_description;
977         else if (long_description)
978                 description = long_description;
979         else
980                 description = NULL;
981
982         if (description) {
983                 char *d;
984
985                 if (!(d = strappend(s->sysv_has_lsb ? "LSB: " : "SYSV: ", description))) {
986                         r = -ENOMEM;
987                         goto finish;
988                 }
989
990                 u->description = d;
991         }
992
993         /* Initialize the start priority from what has been set in the
994          * /etc/rcN.d/ hierarchies if we load the unit file as SysV
995          * init script. */
996         if (s->sysv_start_priority_from_rcnd >= 0)
997                 s->sysv_start_priority = s->sysv_start_priority_from_rcnd;
998
999         u->load_state = UNIT_LOADED;
1000         r = 0;
1001
1002 finish:
1003
1004         if (f)
1005                 fclose(f);
1006
1007         free(short_description);
1008         free(long_description);
1009         free(chkconfig_description);
1010
1011         return r;
1012 }
1013
1014 static int service_load_sysv_name(Service *s, const char *name) {
1015         char **p;
1016
1017         assert(s);
1018         assert(name);
1019
1020         /* For SysV services we strip the *.sh suffixes. */
1021         if (endswith(name, ".sh.service"))
1022                 return -ENOENT;
1023
1024         STRV_FOREACH(p, UNIT(s)->manager->lookup_paths.sysvinit_path) {
1025                 char *path;
1026                 int r;
1027
1028                 path = strjoin(*p, "/", name, NULL);
1029                 if (!path)
1030                         return -ENOMEM;
1031
1032                 assert(endswith(path, ".service"));
1033                 path[strlen(path)-8] = 0;
1034
1035                 r = service_load_sysv_path(s, path);
1036
1037                 if (r >= 0 && UNIT(s)->load_state == UNIT_STUB) {
1038                         /* Try *.sh source'able init scripts */
1039                         strcat(path, ".sh");
1040                         r = service_load_sysv_path(s, path);
1041                 }
1042                 free(path);
1043
1044                 if (r < 0)
1045                         return r;
1046
1047                 if (UNIT(s)->load_state != UNIT_STUB)
1048                         break;
1049         }
1050
1051         return 0;
1052 }
1053
1054 static int service_load_sysv(Service *s) {
1055         const char *t;
1056         Iterator i;
1057         int r;
1058
1059         assert(s);
1060
1061         /* Load service data from SysV init scripts, preferably with
1062          * LSB headers ... */
1063
1064         if (strv_isempty(UNIT(s)->manager->lookup_paths.sysvinit_path))
1065                 return 0;
1066
1067         if ((t = UNIT(s)->id))
1068                 if ((r = service_load_sysv_name(s, t)) < 0)
1069                         return r;
1070
1071         if (UNIT(s)->load_state == UNIT_STUB)
1072                 SET_FOREACH(t, UNIT(s)->names, i) {
1073                         if (t == UNIT(s)->id)
1074                                 continue;
1075
1076                         if ((r = service_load_sysv_name(s, t)) < 0)
1077                                 return r;
1078
1079                         if (UNIT(s)->load_state != UNIT_STUB)
1080                                 break;
1081                 }
1082
1083         return 0;
1084 }
1085 #endif
1086
1087 static int service_verify(Service *s) {
1088         assert(s);
1089
1090         if (UNIT(s)->load_state != UNIT_LOADED)
1091                 return 0;
1092
1093         if (!s->exec_command[SERVICE_EXEC_START]) {
1094                 log_error_unit(UNIT(s)->id, "%s lacks ExecStart setting. Refusing.", UNIT(s)->id);
1095                 return -EINVAL;
1096         }
1097
1098         if (s->type != SERVICE_ONESHOT &&
1099             s->exec_command[SERVICE_EXEC_START]->command_next) {
1100                 log_error_unit(UNIT(s)->id, "%s has more than one ExecStart setting, which is only allowed for Type=oneshot services. Refusing.", UNIT(s)->id);
1101                 return -EINVAL;
1102         }
1103
1104         if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) {
1105                 log_error_unit(UNIT(s)->id, "%s has Restart setting other than no, which isn't allowed for Type=oneshot services. Refusing.", UNIT(s)->id);
1106                 return -EINVAL;
1107         }
1108
1109         if (s->type == SERVICE_DBUS && !s->bus_name) {
1110                 log_error_unit(UNIT(s)->id, "%s is of type D-Bus but no D-Bus service name has been specified. Refusing.", UNIT(s)->id);
1111                 return -EINVAL;
1112         }
1113
1114         if (s->bus_name && s->type != SERVICE_DBUS)
1115                 log_warning_unit(UNIT(s)->id, "%s has a D-Bus service name specified, but is not of type dbus. Ignoring.", UNIT(s)->id);
1116
1117         if (s->exec_context.pam_name && !(s->kill_context.kill_mode == KILL_CONTROL_GROUP || s->kill_context.kill_mode == KILL_MIXED)) {
1118                 log_error_unit(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing.", UNIT(s)->id);
1119                 return -EINVAL;
1120         }
1121
1122         return 0;
1123 }
1124
1125 static int service_add_default_dependencies(Service *s) {
1126         int r;
1127
1128         assert(s);
1129
1130         /* Add a number of automatic dependencies useful for the
1131          * majority of services. */
1132
1133         /* First, pull in base system */
1134         r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES,
1135                                               SPECIAL_BASIC_TARGET, NULL, true);
1136         if (r < 0)
1137                 return r;
1138
1139         /* Second, activate normal shutdown */
1140         r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS,
1141                                               SPECIAL_SHUTDOWN_TARGET, NULL, true);
1142         return r;
1143 }
1144
1145 static void service_fix_output(Service *s) {
1146         assert(s);
1147
1148         /* If nothing has been explicitly configured, patch default
1149          * output in. If input is socket/tty we avoid this however,
1150          * since in that case we want output to default to the same
1151          * place as we read input from. */
1152
1153         if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT &&
1154             s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
1155             s->exec_context.std_input == EXEC_INPUT_NULL)
1156                 s->exec_context.std_error = UNIT(s)->manager->default_std_error;
1157
1158         if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
1159             s->exec_context.std_input == EXEC_INPUT_NULL)
1160                 s->exec_context.std_output = UNIT(s)->manager->default_std_output;
1161 }
1162
1163 static int service_load(Unit *u) {
1164         int r;
1165         Service *s = SERVICE(u);
1166
1167         assert(s);
1168
1169         /* Load a .service file */
1170         r = unit_load_fragment(u);
1171         if (r < 0)
1172                 return r;
1173
1174 #ifdef HAVE_SYSV_COMPAT
1175         /* Load a classic init script as a fallback, if we couldn't find anything */
1176         if (u->load_state == UNIT_STUB) {
1177                 r = service_load_sysv(s);
1178                 if (r < 0)
1179                         return r;
1180         }
1181 #endif
1182
1183         /* Still nothing found? Then let's give up */
1184         if (u->load_state == UNIT_STUB)
1185                 return -ENOENT;
1186
1187         /* This is a new unit? Then let's add in some extras */
1188         if (u->load_state == UNIT_LOADED) {
1189
1190                 /* We were able to load something, then let's add in
1191                  * the dropin directories. */
1192                 r = unit_load_dropin(u);
1193                 if (r < 0)
1194                         return r;
1195
1196                 if (s->type == _SERVICE_TYPE_INVALID)
1197                         s->type = s->bus_name ? SERVICE_DBUS : SERVICE_SIMPLE;
1198
1199                 /* Oneshot services have disabled start timeout by default */
1200                 if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined)
1201                         s->timeout_start_usec = 0;
1202
1203                 service_fix_output(s);
1204
1205                 r = unit_patch_contexts(u);
1206                 if (r < 0)
1207                         return r;
1208
1209                 r = unit_add_exec_dependencies(u, &s->exec_context);
1210                 if (r < 0)
1211                         return r;
1212
1213                 r = unit_add_default_slice(u, &s->cgroup_context);
1214                 if (r < 0)
1215                         return r;
1216
1217 #ifdef HAVE_SYSV_COMPAT
1218                 r = sysv_fix_order(s);
1219                 if (r < 0)
1220                         return r;
1221 #endif
1222
1223                 if (s->type == SERVICE_NOTIFY && s->notify_access == NOTIFY_NONE)
1224                         s->notify_access = NOTIFY_MAIN;
1225
1226                 if (s->watchdog_usec > 0 && s->notify_access == NOTIFY_NONE)
1227                         s->notify_access = NOTIFY_MAIN;
1228
1229                 if (s->bus_name) {
1230                         r = unit_watch_bus_name(u, s->bus_name);
1231                         if (r < 0)
1232                                 return r;
1233                 }
1234
1235                 if (u->default_dependencies) {
1236                         r = service_add_default_dependencies(s);
1237                         if (r < 0)
1238                                 return r;
1239                 }
1240         }
1241
1242         return service_verify(s);
1243 }
1244
1245 static void service_dump(Unit *u, FILE *f, const char *prefix) {
1246
1247         ServiceExecCommand c;
1248         Service *s = SERVICE(u);
1249         const char *prefix2;
1250         _cleanup_free_ char *p2 = NULL;
1251
1252         assert(s);
1253
1254         p2 = strappend(prefix, "\t");
1255         prefix2 = p2 ? p2 : prefix;
1256
1257         fprintf(f,
1258                 "%sService State: %s\n"
1259                 "%sResult: %s\n"
1260                 "%sReload Result: %s\n"
1261                 "%sPermissionsStartOnly: %s\n"
1262                 "%sRootDirectoryStartOnly: %s\n"
1263                 "%sRemainAfterExit: %s\n"
1264                 "%sGuessMainPID: %s\n"
1265                 "%sType: %s\n"
1266                 "%sRestart: %s\n"
1267                 "%sNotifyAccess: %s\n",
1268                 prefix, service_state_to_string(s->state),
1269                 prefix, service_result_to_string(s->result),
1270                 prefix, service_result_to_string(s->reload_result),
1271                 prefix, yes_no(s->permissions_start_only),
1272                 prefix, yes_no(s->root_directory_start_only),
1273                 prefix, yes_no(s->remain_after_exit),
1274                 prefix, yes_no(s->guess_main_pid),
1275                 prefix, service_type_to_string(s->type),
1276                 prefix, service_restart_to_string(s->restart),
1277                 prefix, notify_access_to_string(s->notify_access));
1278
1279         if (s->control_pid > 0)
1280                 fprintf(f,
1281                         "%sControl PID: "PID_FMT"\n",
1282                         prefix, s->control_pid);
1283
1284         if (s->main_pid > 0)
1285                 fprintf(f,
1286                         "%sMain PID: "PID_FMT"\n"
1287                         "%sMain PID Known: %s\n"
1288                         "%sMain PID Alien: %s\n",
1289                         prefix, s->main_pid,
1290                         prefix, yes_no(s->main_pid_known),
1291                         prefix, yes_no(s->main_pid_alien));
1292
1293         if (s->pid_file)
1294                 fprintf(f,
1295                         "%sPIDFile: %s\n",
1296                         prefix, s->pid_file);
1297
1298         if (s->bus_name)
1299                 fprintf(f,
1300                         "%sBusName: %s\n"
1301                         "%sBus Name Good: %s\n",
1302                         prefix, s->bus_name,
1303                         prefix, yes_no(s->bus_name_good));
1304
1305         kill_context_dump(&s->kill_context, f, prefix);
1306         exec_context_dump(&s->exec_context, f, prefix);
1307
1308         for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) {
1309
1310                 if (!s->exec_command[c])
1311                         continue;
1312
1313                 fprintf(f, "%s-> %s:\n",
1314                         prefix, service_exec_command_to_string(c));
1315
1316                 exec_command_dump_list(s->exec_command[c], f, prefix2);
1317         }
1318
1319 #ifdef HAVE_SYSV_COMPAT
1320         if (s->is_sysv)
1321                 fprintf(f,
1322                         "%sSysV Init Script has LSB Header: %s\n"
1323                         "%sSysVEnabled: %s\n",
1324                         prefix, yes_no(s->sysv_has_lsb),
1325                         prefix, yes_no(s->sysv_enabled));
1326
1327         if (s->sysv_start_priority >= 0)
1328                 fprintf(f,
1329                         "%sSysVStartPriority: %i\n",
1330                         prefix, s->sysv_start_priority);
1331
1332         if (s->sysv_runlevels)
1333                 fprintf(f, "%sSysVRunLevels: %s\n",
1334                         prefix, s->sysv_runlevels);
1335 #endif
1336
1337         if (s->status_text)
1338                 fprintf(f, "%sStatus Text: %s\n",
1339                         prefix, s->status_text);
1340 }
1341
1342 static int service_load_pid_file(Service *s, bool may_warn) {
1343         _cleanup_free_ char *k = NULL;
1344         int r;
1345         pid_t pid;
1346
1347         assert(s);
1348
1349         if (!s->pid_file)
1350                 return -ENOENT;
1351
1352         r = read_one_line_file(s->pid_file, &k);
1353         if (r < 0) {
1354                 if (may_warn)
1355                         log_info_unit(UNIT(s)->id,
1356                                       "PID file %s not readable (yet?) after %s.",
1357                                       s->pid_file, service_state_to_string(s->state));
1358                 return r;
1359         }
1360
1361         r = parse_pid(k, &pid);
1362         if (r < 0) {
1363                 if (may_warn)
1364                         log_info_unit(UNIT(s)->id,
1365                                       "Failed to read PID from file %s: %s",
1366                                       s->pid_file, strerror(-r));
1367                 return r;
1368         }
1369
1370         if (!pid_is_alive(pid)) {
1371                 if (may_warn)
1372                         log_info_unit(UNIT(s)->id, "PID "PID_FMT" read from file %s does not exist or is a zombie.", pid, s->pid_file);
1373
1374                 return -ESRCH;
1375         }
1376
1377         if (s->main_pid_known) {
1378                 if (pid == s->main_pid)
1379                         return 0;
1380
1381                 log_debug_unit(UNIT(s)->id,
1382                                "Main PID changing: "PID_FMT" -> "PID_FMT,
1383                                s->main_pid, pid);
1384                 service_unwatch_main_pid(s);
1385                 s->main_pid_known = false;
1386         } else
1387                 log_debug_unit(UNIT(s)->id,
1388                                "Main PID loaded: "PID_FMT, pid);
1389
1390         r = service_set_main_pid(s, pid);
1391         if (r < 0)
1392                 return r;
1393
1394         r = unit_watch_pid(UNIT(s), pid);
1395         if (r < 0) {
1396                 /* FIXME: we need to do something here */
1397                 log_warning_unit(UNIT(s)->id,
1398                                  "Failed to watch PID "PID_FMT" from service %s",
1399                                  pid, UNIT(s)->id);
1400                 return r;
1401         }
1402
1403         return 0;
1404 }
1405
1406 static int service_search_main_pid(Service *s) {
1407         pid_t pid;
1408         int r;
1409
1410         assert(s);
1411
1412         /* If we know it anyway, don't ever fallback to unreliable
1413          * heuristics */
1414         if (s->main_pid_known)
1415                 return 0;
1416
1417         if (!s->guess_main_pid)
1418                 return 0;
1419
1420         assert(s->main_pid <= 0);
1421
1422         pid = unit_search_main_pid(UNIT(s));
1423         if (pid <= 0)
1424                 return -ENOENT;
1425
1426         log_debug_unit(UNIT(s)->id,
1427                        "Main PID guessed: "PID_FMT, pid);
1428         r = service_set_main_pid(s, pid);
1429         if (r < 0)
1430                 return r;
1431
1432         r = unit_watch_pid(UNIT(s), pid);
1433         if (r < 0)
1434                 /* FIXME: we need to do something here */
1435                 log_warning_unit(UNIT(s)->id,
1436                                  "Failed to watch PID "PID_FMT" from service %s",
1437                                  pid, UNIT(s)->id);
1438         return r;
1439 }
1440
1441 static void service_set_state(Service *s, ServiceState state) {
1442         ServiceState old_state;
1443         const UnitActiveState *table;
1444
1445         assert(s);
1446
1447         table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
1448
1449         old_state = s->state;
1450         s->state = state;
1451
1452         service_unwatch_pid_file(s);
1453
1454         if (!IN_SET(state,
1455                     SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1456                     SERVICE_RELOAD,
1457                     SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1458                     SERVICE_STOP_POST,
1459                     SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
1460                     SERVICE_AUTO_RESTART))
1461                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1462
1463         if (!IN_SET(state,
1464                     SERVICE_START, SERVICE_START_POST,
1465                     SERVICE_RUNNING, SERVICE_RELOAD,
1466                     SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1467                     SERVICE_STOP_POST,
1468                     SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1469                 service_unwatch_main_pid(s);
1470                 s->main_command = NULL;
1471         }
1472
1473         if (!IN_SET(state,
1474                     SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1475                     SERVICE_RELOAD,
1476                     SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1477                     SERVICE_STOP_POST,
1478                     SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1479                 service_unwatch_control_pid(s);
1480                 s->control_command = NULL;
1481                 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
1482         }
1483
1484         if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
1485                 unit_unwatch_all_pids(UNIT(s));
1486
1487         if (!IN_SET(state,
1488                     SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1489                     SERVICE_RUNNING, SERVICE_RELOAD,
1490                     SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1491                     SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) &&
1492             !(state == SERVICE_DEAD && UNIT(s)->job)) {
1493                 service_close_socket_fd(s);
1494                 service_connection_unref(s);
1495         }
1496
1497         if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1498                 service_stop_watchdog(s);
1499
1500         /* For the inactive states unit_notify() will trim the cgroup,
1501          * but for exit we have to do that ourselves... */
1502         if (state == SERVICE_EXITED && UNIT(s)->manager->n_reloading <= 0)
1503                 unit_destroy_cgroup(UNIT(s));
1504
1505         /* For remain_after_exit services, let's see if we can "release" the
1506          * hold on the console, since unit_notify() only does that in case of
1507          * change of state */
1508         if (state == SERVICE_EXITED && s->remain_after_exit &&
1509             UNIT(s)->manager->n_on_console > 0) {
1510                 ExecContext *ec = unit_get_exec_context(UNIT(s));
1511                 if (ec && exec_context_may_touch_console(ec)) {
1512                         Manager *m = UNIT(s)->manager;
1513
1514                         m->n_on_console --;
1515                         if (m->n_on_console == 0)
1516                                 /* unset no_console_output flag, since the console is free */
1517                                 m->no_console_output = false;
1518                 }
1519         }
1520
1521         if (old_state != state)
1522                 log_debug_unit(UNIT(s)->id, "%s changed %s -> %s", UNIT(s)->id, service_state_to_string(old_state), service_state_to_string(state));
1523
1524         unit_notify(UNIT(s), table[old_state], table[state], s->reload_result == SERVICE_SUCCESS);
1525         s->reload_result = SERVICE_SUCCESS;
1526 }
1527
1528 static int service_coldplug(Unit *u) {
1529         Service *s = SERVICE(u);
1530         int r;
1531
1532         assert(s);
1533         assert(s->state == SERVICE_DEAD);
1534
1535         if (s->deserialized_state != s->state) {
1536
1537                 if (IN_SET(s->deserialized_state,
1538                            SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1539                            SERVICE_RELOAD,
1540                            SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1541                            SERVICE_STOP_POST,
1542                            SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1543
1544                         usec_t k;
1545
1546                         k = IN_SET(s->deserialized_state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD) ? s->timeout_start_usec : s->timeout_stop_usec;
1547
1548                         /* For the start/stop timeouts 0 means off */
1549                         if (k > 0) {
1550                                 r = service_arm_timer(s, k);
1551                                 if (r < 0)
1552                                         return r;
1553                         }
1554                 }
1555
1556                 if (s->deserialized_state == SERVICE_AUTO_RESTART) {
1557
1558                         /* The restart timeouts 0 means immediately */
1559                         r = service_arm_timer(s, s->restart_usec);
1560                         if (r < 0)
1561                                 return r;
1562                 }
1563
1564                 if (pid_is_unwaited(s->main_pid) &&
1565                     ((s->deserialized_state == SERVICE_START && IN_SET(s->type, SERVICE_FORKING, SERVICE_DBUS, SERVICE_ONESHOT, SERVICE_NOTIFY)) ||
1566                      IN_SET(s->deserialized_state,
1567                             SERVICE_START, SERVICE_START_POST,
1568                             SERVICE_RUNNING, SERVICE_RELOAD,
1569                             SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1570                             SERVICE_STOP_POST,
1571                             SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) {
1572                         r = unit_watch_pid(UNIT(s), s->main_pid);
1573                         if (r < 0)
1574                                 return r;
1575                 }
1576
1577                 if (pid_is_unwaited(s->control_pid) &&
1578                     IN_SET(s->deserialized_state,
1579                            SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1580                            SERVICE_RELOAD,
1581                            SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
1582                            SERVICE_STOP_POST,
1583                            SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1584                         r = unit_watch_pid(UNIT(s), s->control_pid);
1585                         if (r < 0)
1586                                 return r;
1587                 }
1588
1589                 if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
1590                         unit_watch_all_pids(UNIT(s));
1591
1592                 if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1593                         service_start_watchdog(s);
1594
1595                 service_set_state(s, s->deserialized_state);
1596         }
1597
1598         return 0;
1599 }
1600
1601 static int service_collect_fds(Service *s, int **fds, unsigned *n_fds) {
1602         Iterator i;
1603         int r;
1604         int *rfds = NULL;
1605         unsigned rn_fds = 0;
1606         Unit *u;
1607
1608         assert(s);
1609         assert(fds);
1610         assert(n_fds);
1611
1612         if (s->socket_fd >= 0)
1613                 return 0;
1614
1615         SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) {
1616                 int *cfds;
1617                 unsigned cn_fds;
1618                 Socket *sock;
1619
1620                 if (u->type != UNIT_SOCKET)
1621                         continue;
1622
1623                 sock = SOCKET(u);
1624
1625                 r = socket_collect_fds(sock, &cfds, &cn_fds);
1626                 if (r < 0)
1627                         goto fail;
1628
1629                 if (!cfds)
1630                         continue;
1631
1632                 if (!rfds) {
1633                         rfds = cfds;
1634                         rn_fds = cn_fds;
1635                 } else {
1636                         int *t;
1637
1638                         t = new(int, rn_fds+cn_fds);
1639                         if (!t) {
1640                                 free(cfds);
1641                                 r = -ENOMEM;
1642                                 goto fail;
1643                         }
1644
1645                         memcpy(t, rfds, rn_fds * sizeof(int));
1646                         memcpy(t+rn_fds, cfds, cn_fds * sizeof(int));
1647                         free(rfds);
1648                         free(cfds);
1649
1650                         rfds = t;
1651                         rn_fds = rn_fds+cn_fds;
1652                 }
1653         }
1654
1655         *fds = rfds;
1656         *n_fds = rn_fds;
1657
1658         return 0;
1659
1660 fail:
1661         free(rfds);
1662
1663         return r;
1664 }
1665
1666 static int service_spawn(
1667                 Service *s,
1668                 ExecCommand *c,
1669                 bool timeout,
1670                 bool pass_fds,
1671                 bool apply_permissions,
1672                 bool apply_chroot,
1673                 bool apply_tty_stdin,
1674                 bool set_notify_socket,
1675                 bool is_control,
1676                 pid_t *_pid) {
1677
1678         pid_t pid;
1679         int r;
1680         int *fds = NULL;
1681         _cleanup_free_ int *fdsbuf = NULL;
1682         unsigned n_fds = 0, n_env = 0;
1683         _cleanup_strv_free_ char
1684                 **argv = NULL, **final_env = NULL, **our_env = NULL;
1685         const char *path;
1686
1687         assert(s);
1688         assert(c);
1689         assert(_pid);
1690
1691         unit_realize_cgroup(UNIT(s));
1692
1693         r = unit_setup_exec_runtime(UNIT(s));
1694         if (r < 0)
1695                 goto fail;
1696
1697         if (pass_fds ||
1698             s->exec_context.std_input == EXEC_INPUT_SOCKET ||
1699             s->exec_context.std_output == EXEC_OUTPUT_SOCKET ||
1700             s->exec_context.std_error == EXEC_OUTPUT_SOCKET) {
1701
1702                 if (s->socket_fd >= 0) {
1703                         fds = &s->socket_fd;
1704                         n_fds = 1;
1705                 } else {
1706                         r = service_collect_fds(s, &fdsbuf, &n_fds);
1707                         if (r < 0)
1708                                 goto fail;
1709
1710                         fds = fdsbuf;
1711                 }
1712         }
1713
1714         if (timeout && s->timeout_start_usec > 0) {
1715                 r = service_arm_timer(s, s->timeout_start_usec);
1716                 if (r < 0)
1717                         goto fail;
1718         } else
1719                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1720
1721         r = unit_full_printf_strv(UNIT(s), c->argv, &argv);
1722         if (r < 0)
1723                 goto fail;
1724
1725         our_env = new0(char*, 4);
1726         if (!our_env) {
1727                 r = -ENOMEM;
1728                 goto fail;
1729         }
1730
1731         if (set_notify_socket)
1732                 if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0) {
1733                         r = -ENOMEM;
1734                         goto fail;
1735                 }
1736
1737         if (s->main_pid > 0)
1738                 if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0) {
1739                         r = -ENOMEM;
1740                         goto fail;
1741                 }
1742
1743         if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM)
1744                 if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid()) < 0) {
1745                         r = -ENOMEM;
1746                         goto fail;
1747                 }
1748
1749         final_env = strv_env_merge(2, UNIT(s)->manager->environment, our_env, NULL);
1750         if (!final_env) {
1751                 r = -ENOMEM;
1752                 goto fail;
1753         }
1754
1755         if (is_control && UNIT(s)->cgroup_path) {
1756                 path = strappenda(UNIT(s)->cgroup_path, "/control");
1757                 cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
1758         } else
1759                 path = UNIT(s)->cgroup_path;
1760
1761         r = exec_spawn(c,
1762                        argv,
1763                        &s->exec_context,
1764                        fds, n_fds,
1765                        final_env,
1766                        apply_permissions,
1767                        apply_chroot,
1768                        apply_tty_stdin,
1769                        UNIT(s)->manager->confirm_spawn,
1770                        UNIT(s)->manager->cgroup_supported,
1771                        path,
1772                        manager_get_runtime_prefix(UNIT(s)->manager),
1773                        UNIT(s)->id,
1774                        s->watchdog_usec,
1775                        s->type == SERVICE_IDLE ? UNIT(s)->manager->idle_pipe : NULL,
1776                        s->exec_runtime,
1777                        &pid);
1778         if (r < 0)
1779                 goto fail;
1780
1781         r = unit_watch_pid(UNIT(s), pid);
1782         if (r < 0)
1783                 /* FIXME: we need to do something here */
1784                 goto fail;
1785
1786         *_pid = pid;
1787
1788         return 0;
1789
1790 fail:
1791         if (timeout)
1792                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1793
1794         return r;
1795 }
1796
1797 static int main_pid_good(Service *s) {
1798         assert(s);
1799
1800         /* Returns 0 if the pid is dead, 1 if it is good, -1 if we
1801          * don't know */
1802
1803         /* If we know the pid file, then lets just check if it is
1804          * still valid */
1805         if (s->main_pid_known) {
1806
1807                 /* If it's an alien child let's check if it is still
1808                  * alive ... */
1809                 if (s->main_pid_alien && s->main_pid > 0)
1810                         return pid_is_alive(s->main_pid);
1811
1812                 /* .. otherwise assume we'll get a SIGCHLD for it,
1813                  * which we really should wait for to collect exit
1814                  * status and code */
1815                 return s->main_pid > 0;
1816         }
1817
1818         /* We don't know the pid */
1819         return -EAGAIN;
1820 }
1821
1822 _pure_ static int control_pid_good(Service *s) {
1823         assert(s);
1824
1825         return s->control_pid > 0;
1826 }
1827
1828 static int cgroup_good(Service *s) {
1829         int r;
1830
1831         assert(s);
1832
1833         if (!UNIT(s)->cgroup_path)
1834                 return 0;
1835
1836         r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path, true);
1837         if (r < 0)
1838                 return r;
1839
1840         return !r;
1841 }
1842
1843 static int service_execute_action(Service *s, FailureAction action, const char *reason, bool log_action_none);
1844
1845 static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) {
1846         int r;
1847         assert(s);
1848
1849         if (f != SERVICE_SUCCESS)
1850                 s->result = f;
1851
1852         service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD);
1853
1854         if (s->result != SERVICE_SUCCESS)
1855                 service_execute_action(s, s->failure_action, "failed", false);
1856
1857         if (allow_restart &&
1858             !s->forbid_restart &&
1859             (s->restart == SERVICE_RESTART_ALWAYS ||
1860              (s->restart == SERVICE_RESTART_ON_SUCCESS && s->result == SERVICE_SUCCESS) ||
1861              (s->restart == SERVICE_RESTART_ON_FAILURE && s->result != SERVICE_SUCCESS) ||
1862              (s->restart == SERVICE_RESTART_ON_WATCHDOG && s->result == SERVICE_FAILURE_WATCHDOG) ||
1863              (s->restart == SERVICE_RESTART_ON_ABORT && (s->result == SERVICE_FAILURE_SIGNAL ||
1864                                                          s->result == SERVICE_FAILURE_CORE_DUMP))) &&
1865             (s->result != SERVICE_FAILURE_EXIT_CODE ||
1866              !set_contains(s->restart_ignore_status.code, INT_TO_PTR(s->main_exec_status.status))) &&
1867             (s->result != SERVICE_FAILURE_SIGNAL ||
1868              !set_contains(s->restart_ignore_status.signal, INT_TO_PTR(s->main_exec_status.status)))) {
1869
1870                 r = service_arm_timer(s, s->restart_usec);
1871                 if (r < 0)
1872                         goto fail;
1873
1874                 service_set_state(s, SERVICE_AUTO_RESTART);
1875         }
1876
1877         s->forbid_restart = false;
1878
1879         /* We want fresh tmpdirs in case service is started again immediately */
1880         exec_runtime_destroy(s->exec_runtime);
1881         s->exec_runtime = exec_runtime_unref(s->exec_runtime);
1882
1883         /* Also, remove the runtime directory in */
1884         exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
1885
1886         /* Try to delete the pid file. At this point it will be
1887          * out-of-date, and some software might be confused by it, so
1888          * let's remove it. */
1889         if (s->pid_file)
1890                 unlink_noerrno(s->pid_file);
1891
1892         return;
1893
1894 fail:
1895         log_warning_unit(UNIT(s)->id,
1896                          "%s failed to run install restart timer: %s",
1897                          UNIT(s)->id, strerror(-r));
1898         service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
1899 }
1900
1901 static void service_enter_stop_post(Service *s, ServiceResult f) {
1902         int r;
1903         assert(s);
1904
1905         if (f != SERVICE_SUCCESS)
1906                 s->result = f;
1907
1908         service_unwatch_control_pid(s);
1909         unit_watch_all_pids(UNIT(s));
1910
1911         s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST];
1912         if (s->control_command) {
1913                 s->control_command_id = SERVICE_EXEC_STOP_POST;
1914
1915                 r = service_spawn(s,
1916                                   s->control_command,
1917                                   true,
1918                                   false,
1919                                   !s->permissions_start_only,
1920                                   !s->root_directory_start_only,
1921                                   true,
1922                                   false,
1923                                   true,
1924                                   &s->control_pid);
1925                 if (r < 0)
1926                         goto fail;
1927
1928                 service_set_state(s, SERVICE_STOP_POST);
1929         } else
1930                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS);
1931
1932         return;
1933
1934 fail:
1935         log_warning_unit(UNIT(s)->id,
1936                          "%s failed to run 'stop-post' task: %s",
1937                          UNIT(s)->id, strerror(-r));
1938         service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
1939 }
1940
1941 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) {
1942         int r;
1943
1944         assert(s);
1945
1946         if (f != SERVICE_SUCCESS)
1947                 s->result = f;
1948
1949         unit_watch_all_pids(UNIT(s));
1950
1951         r = unit_kill_context(
1952                         UNIT(s),
1953                         &s->kill_context,
1954                         state != SERVICE_STOP_SIGTERM && state != SERVICE_FINAL_SIGTERM,
1955                         s->main_pid,
1956                         s->control_pid,
1957                         s->main_pid_alien);
1958
1959         if (r < 0)
1960                 goto fail;
1961
1962         if (r > 0) {
1963                 if (s->timeout_stop_usec > 0) {
1964                         r = service_arm_timer(s, s->timeout_stop_usec);
1965                         if (r < 0)
1966                                 goto fail;
1967                 }
1968
1969                 service_set_state(s, state);
1970         } else if (state == SERVICE_STOP_SIGTERM)
1971                 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS);
1972         else if (state == SERVICE_STOP_SIGKILL)
1973                 service_enter_stop_post(s, SERVICE_SUCCESS);
1974         else if (state == SERVICE_FINAL_SIGTERM)
1975                 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS);
1976         else
1977                 service_enter_dead(s, SERVICE_SUCCESS, true);
1978
1979         return;
1980
1981 fail:
1982         log_warning_unit(UNIT(s)->id,
1983                          "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
1984
1985         if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
1986                 service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES);
1987         else
1988                 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
1989 }
1990
1991 static void service_enter_stop(Service *s, ServiceResult f) {
1992         int r;
1993
1994         assert(s);
1995
1996         if (f != SERVICE_SUCCESS)
1997                 s->result = f;
1998
1999         service_unwatch_control_pid(s);
2000         unit_watch_all_pids(UNIT(s));
2001
2002         s->control_command = s->exec_command[SERVICE_EXEC_STOP];
2003         if (s->control_command) {
2004                 s->control_command_id = SERVICE_EXEC_STOP;
2005
2006                 r = service_spawn(s,
2007                                   s->control_command,
2008                                   true,
2009                                   false,
2010                                   !s->permissions_start_only,
2011                                   !s->root_directory_start_only,
2012                                   false,
2013                                   false,
2014                                   true,
2015                                   &s->control_pid);
2016                 if (r < 0)
2017                         goto fail;
2018
2019                 service_set_state(s, SERVICE_STOP);
2020         } else
2021                 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
2022
2023         return;
2024
2025 fail:
2026         log_warning_unit(UNIT(s)->id,
2027                          "%s failed to run 'stop' task: %s", UNIT(s)->id, strerror(-r));
2028         service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2029 }
2030
2031 static void service_enter_running(Service *s, ServiceResult f) {
2032         int main_pid_ok, cgroup_ok;
2033         assert(s);
2034
2035         if (f != SERVICE_SUCCESS)
2036                 s->result = f;
2037
2038         main_pid_ok = main_pid_good(s);
2039         cgroup_ok = cgroup_good(s);
2040
2041         if ((main_pid_ok > 0 || (main_pid_ok < 0 && cgroup_ok != 0)) &&
2042             (s->bus_name_good || s->type != SERVICE_DBUS))
2043                 service_set_state(s, SERVICE_RUNNING);
2044         else if (s->remain_after_exit)
2045                 service_set_state(s, SERVICE_EXITED);
2046         else
2047                 service_enter_stop(s, SERVICE_SUCCESS);
2048 }
2049
2050 static void service_enter_start_post(Service *s) {
2051         int r;
2052         assert(s);
2053
2054         service_unwatch_control_pid(s);
2055         service_reset_watchdog(s);
2056
2057         s->control_command = s->exec_command[SERVICE_EXEC_START_POST];
2058         if (s->control_command) {
2059                 s->control_command_id = SERVICE_EXEC_START_POST;
2060
2061                 r = service_spawn(s,
2062                                   s->control_command,
2063                                   true,
2064                                   false,
2065                                   !s->permissions_start_only,
2066                                   !s->root_directory_start_only,
2067                                   false,
2068                                   false,
2069                                   true,
2070                                   &s->control_pid);
2071                 if (r < 0)
2072                         goto fail;
2073
2074                 service_set_state(s, SERVICE_START_POST);
2075         } else
2076                 service_enter_running(s, SERVICE_SUCCESS);
2077
2078         return;
2079
2080 fail:
2081         log_warning_unit(UNIT(s)->id,
2082                          "%s failed to run 'start-post' task: %s", UNIT(s)->id, strerror(-r));
2083         service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2084 }
2085
2086 static void service_kill_control_processes(Service *s) {
2087         char *p;
2088
2089         if (!UNIT(s)->cgroup_path)
2090                 return;
2091
2092         p = strappenda(UNIT(s)->cgroup_path, "/control");
2093         cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, p, SIGKILL, true, true, true, NULL);
2094 }
2095
2096 static void service_enter_start(Service *s) {
2097         ExecCommand *c;
2098         pid_t pid;
2099         int r;
2100
2101         assert(s);
2102
2103         assert(s->exec_command[SERVICE_EXEC_START]);
2104         assert(!s->exec_command[SERVICE_EXEC_START]->command_next || s->type == SERVICE_ONESHOT);
2105
2106         service_unwatch_control_pid(s);
2107         service_unwatch_main_pid(s);
2108
2109         /* We want to ensure that nobody leaks processes from
2110          * START_PRE here, so let's go on a killing spree, People
2111          * should not spawn long running processes from START_PRE. */
2112         service_kill_control_processes(s);
2113
2114         if (s->type == SERVICE_FORKING) {
2115                 s->control_command_id = SERVICE_EXEC_START;
2116                 c = s->control_command = s->exec_command[SERVICE_EXEC_START];
2117
2118                 s->main_command = NULL;
2119         } else {
2120                 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
2121                 s->control_command = NULL;
2122
2123                 c = s->main_command = s->exec_command[SERVICE_EXEC_START];
2124         }
2125
2126         r = service_spawn(s,
2127                           c,
2128                           s->type == SERVICE_FORKING || s->type == SERVICE_DBUS ||
2129                             s->type == SERVICE_NOTIFY || s->type == SERVICE_ONESHOT,
2130                           true,
2131                           true,
2132                           true,
2133                           true,
2134                           s->notify_access != NOTIFY_NONE,
2135                           false,
2136                           &pid);
2137         if (r < 0)
2138                 goto fail;
2139
2140         if (s->type == SERVICE_SIMPLE || s->type == SERVICE_IDLE) {
2141                 /* For simple services we immediately start
2142                  * the START_POST binaries. */
2143
2144                 service_set_main_pid(s, pid);
2145                 service_enter_start_post(s);
2146
2147         } else  if (s->type == SERVICE_FORKING) {
2148
2149                 /* For forking services we wait until the start
2150                  * process exited. */
2151
2152                 s->control_pid = pid;
2153                 service_set_state(s, SERVICE_START);
2154
2155         } else if (s->type == SERVICE_ONESHOT ||
2156                    s->type == SERVICE_DBUS ||
2157                    s->type == SERVICE_NOTIFY) {
2158
2159                 /* For oneshot services we wait until the start
2160                  * process exited, too, but it is our main process. */
2161
2162                 /* For D-Bus services we know the main pid right away,
2163                  * but wait for the bus name to appear on the
2164                  * bus. Notify services are similar. */
2165
2166                 service_set_main_pid(s, pid);
2167                 service_set_state(s, SERVICE_START);
2168         } else
2169                 assert_not_reached("Unknown service type");
2170
2171         return;
2172
2173 fail:
2174         log_warning_unit(UNIT(s)->id,
2175                          "%s failed to run 'start' task: %s", UNIT(s)->id, strerror(-r));
2176         service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
2177 }
2178
2179 static void service_enter_start_pre(Service *s) {
2180         int r;
2181
2182         assert(s);
2183
2184         service_unwatch_control_pid(s);
2185
2186         s->control_command = s->exec_command[SERVICE_EXEC_START_PRE];
2187         if (s->control_command) {
2188                 /* Before we start anything, let's clear up what might
2189                  * be left from previous runs. */
2190                 service_kill_control_processes(s);
2191
2192                 s->control_command_id = SERVICE_EXEC_START_PRE;
2193
2194                 r = service_spawn(s,
2195                                   s->control_command,
2196                                   true,
2197                                   false,
2198                                   !s->permissions_start_only,
2199                                   !s->root_directory_start_only,
2200                                   true,
2201                                   false,
2202                                   true,
2203                                   &s->control_pid);
2204                 if (r < 0)
2205                         goto fail;
2206
2207                 service_set_state(s, SERVICE_START_PRE);
2208         } else
2209                 service_enter_start(s);
2210
2211         return;
2212
2213 fail:
2214         log_warning_unit(UNIT(s)->id,
2215                          "%s failed to run 'start-pre' task: %s", UNIT(s)->id, strerror(-r));
2216         service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2217 }
2218
2219 static void service_enter_restart(Service *s) {
2220         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
2221         int r;
2222
2223         assert(s);
2224
2225         if (UNIT(s)->job && UNIT(s)->job->type == JOB_STOP) {
2226                 /* Don't restart things if we are going down anyway */
2227                 log_info_unit(UNIT(s)->id,
2228                               "Stop job pending for unit, delaying automatic restart.");
2229
2230                 r = service_arm_timer(s, s->restart_usec);
2231                 if (r < 0)
2232                         goto fail;
2233
2234                 return;
2235         }
2236
2237         /* Any units that are bound to this service must also be
2238          * restarted. We use JOB_RESTART (instead of the more obvious
2239          * JOB_START) here so that those dependency jobs will be added
2240          * as well. */
2241         r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_FAIL, false, &error, NULL);
2242         if (r < 0)
2243                 goto fail;
2244
2245         /* Note that we stay in the SERVICE_AUTO_RESTART state here,
2246          * it will be canceled as part of the service_stop() call that
2247          * is executed as part of JOB_RESTART. */
2248
2249         log_debug_unit(UNIT(s)->id,
2250                        "%s scheduled restart job.", UNIT(s)->id);
2251         return;
2252
2253 fail:
2254         log_warning_unit(UNIT(s)->id,
2255                          "%s failed to schedule restart job: %s",
2256                          UNIT(s)->id, bus_error_message(&error, -r));
2257         service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
2258 }
2259
2260 static void service_enter_reload(Service *s) {
2261         int r;
2262
2263         assert(s);
2264
2265         service_unwatch_control_pid(s);
2266
2267         s->control_command = s->exec_command[SERVICE_EXEC_RELOAD];
2268         if (s->control_command) {
2269                 s->control_command_id = SERVICE_EXEC_RELOAD;
2270
2271                 r = service_spawn(s,
2272                                   s->control_command,
2273                                   true,
2274                                   false,
2275                                   !s->permissions_start_only,
2276                                   !s->root_directory_start_only,
2277                                   false,
2278                                   false,
2279                                   true,
2280                                   &s->control_pid);
2281                 if (r < 0)
2282                         goto fail;
2283
2284                 service_set_state(s, SERVICE_RELOAD);
2285         } else
2286                 service_enter_running(s, SERVICE_SUCCESS);
2287
2288         return;
2289
2290 fail:
2291         log_warning_unit(UNIT(s)->id,
2292                          "%s failed to run 'reload' task: %s",
2293                          UNIT(s)->id, strerror(-r));
2294         s->reload_result = SERVICE_FAILURE_RESOURCES;
2295         service_enter_running(s, SERVICE_SUCCESS);
2296 }
2297
2298 static void service_run_next_control(Service *s) {
2299         int r;
2300
2301         assert(s);
2302         assert(s->control_command);
2303         assert(s->control_command->command_next);
2304
2305         assert(s->control_command_id != SERVICE_EXEC_START);
2306
2307         s->control_command = s->control_command->command_next;
2308         service_unwatch_control_pid(s);
2309
2310         r = service_spawn(s,
2311                           s->control_command,
2312                           true,
2313                           false,
2314                           !s->permissions_start_only,
2315                           !s->root_directory_start_only,
2316                           s->control_command_id == SERVICE_EXEC_START_PRE ||
2317                           s->control_command_id == SERVICE_EXEC_STOP_POST,
2318                           false,
2319                           true,
2320                           &s->control_pid);
2321         if (r < 0)
2322                 goto fail;
2323
2324         return;
2325
2326 fail:
2327         log_warning_unit(UNIT(s)->id,
2328                          "%s failed to run next control task: %s",
2329                          UNIT(s)->id, strerror(-r));
2330
2331         if (s->state == SERVICE_START_PRE)
2332                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
2333         else if (s->state == SERVICE_STOP)
2334                 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2335         else if (s->state == SERVICE_STOP_POST)
2336                 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2337         else if (s->state == SERVICE_RELOAD) {
2338                 s->reload_result = SERVICE_FAILURE_RESOURCES;
2339                 service_enter_running(s, SERVICE_SUCCESS);
2340         } else
2341                 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2342 }
2343
2344 static void service_run_next_main(Service *s) {
2345         pid_t pid;
2346         int r;
2347
2348         assert(s);
2349         assert(s->main_command);
2350         assert(s->main_command->command_next);
2351         assert(s->type == SERVICE_ONESHOT);
2352
2353         s->main_command = s->main_command->command_next;
2354         service_unwatch_main_pid(s);
2355
2356         r = service_spawn(s,
2357                           s->main_command,
2358                           true,
2359                           true,
2360                           true,
2361                           true,
2362                           true,
2363                           s->notify_access != NOTIFY_NONE,
2364                           false,
2365                           &pid);
2366         if (r < 0)
2367                 goto fail;
2368
2369         service_set_main_pid(s, pid);
2370
2371         return;
2372
2373 fail:
2374         log_warning_unit(UNIT(s)->id,
2375                          "%s failed to run next main task: %s", UNIT(s)->id, strerror(-r));
2376         service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2377 }
2378
2379 static int service_execute_action(Service *s, FailureAction action, const char *reason, bool log_action_none) {
2380         assert(s);
2381
2382         if (action == SERVICE_FAILURE_ACTION_REBOOT ||
2383             action == SERVICE_FAILURE_ACTION_REBOOT_FORCE)
2384                 update_reboot_param_file(s->reboot_arg);
2385
2386         switch (action) {
2387
2388         case SERVICE_FAILURE_ACTION_NONE:
2389                 if (log_action_none)
2390                         log_warning_unit(UNIT(s)->id,
2391                                          "%s %s, refusing to start.", UNIT(s)->id, reason);
2392                 break;
2393
2394         case SERVICE_FAILURE_ACTION_REBOOT: {
2395                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
2396                 int r;
2397
2398                 log_warning_unit(UNIT(s)->id,
2399                                  "%s %s, rebooting.", UNIT(s)->id, reason);
2400
2401                 r = manager_add_job_by_name(UNIT(s)->manager, JOB_START,
2402                                             SPECIAL_REBOOT_TARGET, JOB_REPLACE,
2403                                             true, &error, NULL);
2404                 if (r < 0)
2405                         log_error_unit(UNIT(s)->id,
2406                                        "Failed to reboot: %s.", bus_error_message(&error, r));
2407
2408                 break;
2409         }
2410
2411         case SERVICE_FAILURE_ACTION_REBOOT_FORCE:
2412                 log_warning_unit(UNIT(s)->id,
2413                                  "%s %s, forcibly rebooting.", UNIT(s)->id, reason);
2414                 UNIT(s)->manager->exit_code = MANAGER_REBOOT;
2415                 break;
2416
2417         case SERVICE_FAILURE_ACTION_REBOOT_IMMEDIATE:
2418                 log_warning_unit(UNIT(s)->id,
2419                                  "%s %s, rebooting immediately.", UNIT(s)->id, reason);
2420                 sync();
2421                 if (s->reboot_arg) {
2422                         log_info("Rebooting with argument '%s'.", s->reboot_arg);
2423                         syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
2424                                 LINUX_REBOOT_CMD_RESTART2, s->reboot_arg);
2425                 }
2426
2427                 log_info("Rebooting.");
2428                 reboot(RB_AUTOBOOT);
2429                 break;
2430
2431         default:
2432                 log_error_unit(UNIT(s)->id,
2433                                "failure action=%i", action);
2434                 assert_not_reached("Unknown FailureAction.");
2435         }
2436
2437         return -ECANCELED;
2438 }
2439
2440 static int service_start_limit_test(Service *s) {
2441         assert(s);
2442
2443         if (ratelimit_test(&s->start_limit))
2444                 return 0;
2445
2446         return service_execute_action(s, s->start_limit_action, "start request repeated too quickly", true);
2447 }
2448
2449 static int service_start(Unit *u) {
2450         Service *s = SERVICE(u);
2451         int r;
2452
2453         assert(s);
2454
2455         /* We cannot fulfill this request right now, try again later
2456          * please! */
2457         if (s->state == SERVICE_STOP ||
2458             s->state == SERVICE_STOP_SIGTERM ||
2459             s->state == SERVICE_STOP_SIGKILL ||
2460             s->state == SERVICE_STOP_POST ||
2461             s->state == SERVICE_FINAL_SIGTERM ||
2462             s->state == SERVICE_FINAL_SIGKILL)
2463                 return -EAGAIN;
2464
2465         /* Already on it! */
2466         if (s->state == SERVICE_START_PRE ||
2467             s->state == SERVICE_START ||
2468             s->state == SERVICE_START_POST)
2469                 return 0;
2470
2471         /* A service that will be restarted must be stopped first to
2472          * trigger BindsTo and/or OnFailure dependencies. If a user
2473          * does not want to wait for the holdoff time to elapse, the
2474          * service should be manually restarted, not started. We
2475          * simply return EAGAIN here, so that any start jobs stay
2476          * queued, and assume that the auto restart timer will
2477          * eventually trigger the restart. */
2478         if (s->state == SERVICE_AUTO_RESTART)
2479                 return -EAGAIN;
2480
2481         assert(s->state == SERVICE_DEAD || s->state == SERVICE_FAILED);
2482
2483         /* Make sure we don't enter a busy loop of some kind. */
2484         r = service_start_limit_test(s);
2485         if (r < 0) {
2486                 service_enter_dead(s, SERVICE_FAILURE_START_LIMIT, false);
2487                 return r;
2488         }
2489
2490         s->result = SERVICE_SUCCESS;
2491         s->reload_result = SERVICE_SUCCESS;
2492         s->main_pid_known = false;
2493         s->main_pid_alien = false;
2494         s->forbid_restart = false;
2495
2496         service_enter_start_pre(s);
2497         return 0;
2498 }
2499
2500 static int service_stop(Unit *u) {
2501         Service *s = SERVICE(u);
2502
2503         assert(s);
2504
2505         /* Don't create restart jobs from here. */
2506         s->forbid_restart = true;
2507
2508         /* Already on it */
2509         if (s->state == SERVICE_STOP ||
2510             s->state == SERVICE_STOP_SIGTERM ||
2511             s->state == SERVICE_STOP_SIGKILL ||
2512             s->state == SERVICE_STOP_POST ||
2513             s->state == SERVICE_FINAL_SIGTERM ||
2514             s->state == SERVICE_FINAL_SIGKILL)
2515                 return 0;
2516
2517         /* A restart will be scheduled or is in progress. */
2518         if (s->state == SERVICE_AUTO_RESTART) {
2519                 service_set_state(s, SERVICE_DEAD);
2520                 return 0;
2521         }
2522
2523         /* If there's already something running we go directly into
2524          * kill mode. */
2525         if (s->state == SERVICE_START_PRE ||
2526             s->state == SERVICE_START ||
2527             s->state == SERVICE_START_POST ||
2528             s->state == SERVICE_RELOAD) {
2529                 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
2530                 return 0;
2531         }
2532
2533         assert(s->state == SERVICE_RUNNING ||
2534                s->state == SERVICE_EXITED);
2535
2536         service_enter_stop(s, SERVICE_SUCCESS);
2537         return 0;
2538 }
2539
2540 static int service_reload(Unit *u) {
2541         Service *s = SERVICE(u);
2542
2543         assert(s);
2544
2545         assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
2546
2547         service_enter_reload(s);
2548         return 0;
2549 }
2550
2551 _pure_ static bool service_can_reload(Unit *u) {
2552         Service *s = SERVICE(u);
2553
2554         assert(s);
2555
2556         return !!s->exec_command[SERVICE_EXEC_RELOAD];
2557 }
2558
2559 static int service_serialize(Unit *u, FILE *f, FDSet *fds) {
2560         Service *s = SERVICE(u);
2561
2562         assert(u);
2563         assert(f);
2564         assert(fds);
2565
2566         unit_serialize_item(u, f, "state", service_state_to_string(s->state));
2567         unit_serialize_item(u, f, "result", service_result_to_string(s->result));
2568         unit_serialize_item(u, f, "reload-result", service_result_to_string(s->reload_result));
2569
2570         if (s->control_pid > 0)
2571                 unit_serialize_item_format(u, f, "control-pid", PID_FMT,
2572                                            s->control_pid);
2573
2574         if (s->main_pid_known && s->main_pid > 0)
2575                 unit_serialize_item_format(u, f, "main-pid", PID_FMT, s->main_pid);
2576
2577         unit_serialize_item(u, f, "main-pid-known", yes_no(s->main_pid_known));
2578
2579         if (s->status_text)
2580                 unit_serialize_item(u, f, "status-text", s->status_text);
2581
2582         /* FIXME: There's a minor uncleanliness here: if there are
2583          * multiple commands attached here, we will start from the
2584          * first one again */
2585         if (s->control_command_id >= 0)
2586                 unit_serialize_item(u, f, "control-command",
2587                                     service_exec_command_to_string(s->control_command_id));
2588
2589         if (s->socket_fd >= 0) {
2590                 int copy;
2591
2592                 if ((copy = fdset_put_dup(fds, s->socket_fd)) < 0)
2593                         return copy;
2594
2595                 unit_serialize_item_format(u, f, "socket-fd", "%i", copy);
2596         }
2597
2598         if (s->main_exec_status.pid > 0) {
2599                 unit_serialize_item_format(u, f, "main-exec-status-pid", PID_FMT,
2600                                            s->main_exec_status.pid);
2601                 dual_timestamp_serialize(f, "main-exec-status-start",
2602                                          &s->main_exec_status.start_timestamp);
2603                 dual_timestamp_serialize(f, "main-exec-status-exit",
2604                                          &s->main_exec_status.exit_timestamp);
2605
2606                 if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
2607                         unit_serialize_item_format(u, f, "main-exec-status-code", "%i",
2608                                                    s->main_exec_status.code);
2609                         unit_serialize_item_format(u, f, "main-exec-status-status", "%i",
2610                                                    s->main_exec_status.status);
2611                 }
2612         }
2613         if (dual_timestamp_is_set(&s->watchdog_timestamp))
2614                 dual_timestamp_serialize(f, "watchdog-timestamp", &s->watchdog_timestamp);
2615
2616         if (s->forbid_restart)
2617                 unit_serialize_item(u, f, "forbid-restart", yes_no(s->forbid_restart));
2618
2619         return 0;
2620 }
2621
2622 static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2623         Service *s = SERVICE(u);
2624
2625         assert(u);
2626         assert(key);
2627         assert(value);
2628         assert(fds);
2629
2630         if (streq(key, "state")) {
2631                 ServiceState state;
2632
2633                 state = service_state_from_string(value);
2634                 if (state < 0)
2635                         log_debug_unit(u->id, "Failed to parse state value %s", value);
2636                 else
2637                         s->deserialized_state = state;
2638         } else if (streq(key, "result")) {
2639                 ServiceResult f;
2640
2641                 f = service_result_from_string(value);
2642                 if (f < 0)
2643                         log_debug_unit(u->id, "Failed to parse result value %s", value);
2644                 else if (f != SERVICE_SUCCESS)
2645                         s->result = f;
2646
2647         } else if (streq(key, "reload-result")) {
2648                 ServiceResult f;
2649
2650                 f = service_result_from_string(value);
2651                 if (f < 0)
2652                         log_debug_unit(u->id, "Failed to parse reload result value %s", value);
2653                 else if (f != SERVICE_SUCCESS)
2654                         s->reload_result = f;
2655
2656         } else if (streq(key, "control-pid")) {
2657                 pid_t pid;
2658
2659                 if (parse_pid(value, &pid) < 0)
2660                         log_debug_unit(u->id, "Failed to parse control-pid value %s", value);
2661                 else
2662                         s->control_pid = pid;
2663         } else if (streq(key, "main-pid")) {
2664                 pid_t pid;
2665
2666                 if (parse_pid(value, &pid) < 0)
2667                         log_debug_unit(u->id, "Failed to parse main-pid value %s", value);
2668                 else {
2669                         service_set_main_pid(s, pid);
2670                         unit_watch_pid(UNIT(s), pid);
2671                 }
2672         } else if (streq(key, "main-pid-known")) {
2673                 int b;
2674
2675                 b = parse_boolean(value);
2676                 if (b < 0)
2677                         log_debug_unit(u->id, "Failed to parse main-pid-known value %s", value);
2678                 else
2679                         s->main_pid_known = b;
2680         } else if (streq(key, "status-text")) {
2681                 char *t;
2682
2683                 t = strdup(value);
2684                 if (!t)
2685                         log_oom();
2686                 else {
2687                         free(s->status_text);
2688                         s->status_text = t;
2689                 }
2690
2691         } else if (streq(key, "control-command")) {
2692                 ServiceExecCommand id;
2693
2694                 id = service_exec_command_from_string(value);
2695                 if (id < 0)
2696                         log_debug_unit(u->id, "Failed to parse exec-command value %s", value);
2697                 else {
2698                         s->control_command_id = id;
2699                         s->control_command = s->exec_command[id];
2700                 }
2701         } else if (streq(key, "socket-fd")) {
2702                 int fd;
2703
2704                 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2705                         log_debug_unit(u->id, "Failed to parse socket-fd value %s", value);
2706                 else {
2707
2708                         safe_close(s->socket_fd);
2709                         s->socket_fd = fdset_remove(fds, fd);
2710                 }
2711         } else if (streq(key, "main-exec-status-pid")) {
2712                 pid_t pid;
2713
2714                 if (parse_pid(value, &pid) < 0)
2715                         log_debug_unit(u->id, "Failed to parse main-exec-status-pid value %s", value);
2716                 else
2717                         s->main_exec_status.pid = pid;
2718         } else if (streq(key, "main-exec-status-code")) {
2719                 int i;
2720
2721                 if (safe_atoi(value, &i) < 0)
2722                         log_debug_unit(u->id, "Failed to parse main-exec-status-code value %s", value);
2723                 else
2724                         s->main_exec_status.code = i;
2725         } else if (streq(key, "main-exec-status-status")) {
2726                 int i;
2727
2728                 if (safe_atoi(value, &i) < 0)
2729                         log_debug_unit(u->id, "Failed to parse main-exec-status-status value %s", value);
2730                 else
2731                         s->main_exec_status.status = i;
2732         } else if (streq(key, "main-exec-status-start"))
2733                 dual_timestamp_deserialize(value, &s->main_exec_status.start_timestamp);
2734         else if (streq(key, "main-exec-status-exit"))
2735                 dual_timestamp_deserialize(value, &s->main_exec_status.exit_timestamp);
2736         else if (streq(key, "watchdog-timestamp"))
2737                 dual_timestamp_deserialize(value, &s->watchdog_timestamp);
2738         else if (streq(key, "forbid-restart")) {
2739                 int b;
2740
2741                 b = parse_boolean(value);
2742                 if (b < 0)
2743                         log_debug_unit(u->id, "Failed to parse forbid-restart value %s", value);
2744                 else
2745                         s->forbid_restart = b;
2746         } else
2747                 log_debug_unit(u->id, "Unknown serialization key '%s'", key);
2748
2749         return 0;
2750 }
2751
2752 _pure_ static UnitActiveState service_active_state(Unit *u) {
2753         const UnitActiveState *table;
2754
2755         assert(u);
2756
2757         table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
2758
2759         return table[SERVICE(u)->state];
2760 }
2761
2762 static const char *service_sub_state_to_string(Unit *u) {
2763         assert(u);
2764
2765         return service_state_to_string(SERVICE(u)->state);
2766 }
2767
2768 static bool service_check_gc(Unit *u) {
2769         Service *s = SERVICE(u);
2770
2771         assert(s);
2772
2773         /* Never clean up services that still have a process around,
2774          * even if the service is formally dead. */
2775         if (cgroup_good(s) > 0 ||
2776             main_pid_good(s) > 0 ||
2777             control_pid_good(s) > 0)
2778                 return true;
2779
2780 #ifdef HAVE_SYSV_COMPAT
2781         if (s->is_sysv)
2782                 return true;
2783 #endif
2784
2785         return false;
2786 }
2787
2788 _pure_ static bool service_check_snapshot(Unit *u) {
2789         Service *s = SERVICE(u);
2790
2791         assert(s);
2792
2793         return (s->socket_fd < 0);
2794 }
2795
2796 static int service_retry_pid_file(Service *s) {
2797         int r;
2798
2799         assert(s->pid_file);
2800         assert(s->state == SERVICE_START || s->state == SERVICE_START_POST);
2801
2802         r = service_load_pid_file(s, false);
2803         if (r < 0)
2804                 return r;
2805
2806         service_unwatch_pid_file(s);
2807
2808         service_enter_running(s, SERVICE_SUCCESS);
2809         return 0;
2810 }
2811
2812 static int service_watch_pid_file(Service *s) {
2813         int r;
2814
2815         log_debug_unit(UNIT(s)->id,
2816                        "Setting watch for %s's PID file %s",
2817                        UNIT(s)->id, s->pid_file_pathspec->path);
2818         r = path_spec_watch(s->pid_file_pathspec, service_dispatch_io);
2819         if (r < 0)
2820                 goto fail;
2821
2822         /* the pidfile might have appeared just before we set the watch */
2823         log_debug_unit(UNIT(s)->id,
2824                        "Trying to read %s's PID file %s in case it changed",
2825                        UNIT(s)->id, s->pid_file_pathspec->path);
2826         service_retry_pid_file(s);
2827
2828         return 0;
2829 fail:
2830         log_error_unit(UNIT(s)->id,
2831                        "Failed to set a watch for %s's PID file %s: %s",
2832                        UNIT(s)->id, s->pid_file_pathspec->path, strerror(-r));
2833         service_unwatch_pid_file(s);
2834         return r;
2835 }
2836
2837 static int service_demand_pid_file(Service *s) {
2838         PathSpec *ps;
2839
2840         assert(s->pid_file);
2841         assert(!s->pid_file_pathspec);
2842
2843         ps = new0(PathSpec, 1);
2844         if (!ps)
2845                 return -ENOMEM;
2846
2847         ps->unit = UNIT(s);
2848         ps->path = strdup(s->pid_file);
2849         if (!ps->path) {
2850                 free(ps);
2851                 return -ENOMEM;
2852         }
2853
2854         path_kill_slashes(ps->path);
2855
2856         /* PATH_CHANGED would not be enough. There are daemons (sendmail) that
2857          * keep their PID file open all the time. */
2858         ps->type = PATH_MODIFIED;
2859         ps->inotify_fd = -1;
2860
2861         s->pid_file_pathspec = ps;
2862
2863         return service_watch_pid_file(s);
2864 }
2865
2866 static int service_dispatch_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
2867         PathSpec *p = userdata;
2868         Service *s;
2869
2870         assert(p);
2871
2872         s = SERVICE(p->unit);
2873
2874         assert(s);
2875         assert(fd >= 0);
2876         assert(s->state == SERVICE_START || s->state == SERVICE_START_POST);
2877         assert(s->pid_file_pathspec);
2878         assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd));
2879
2880         log_debug_unit(UNIT(s)->id, "inotify event for %s", UNIT(s)->id);
2881
2882         if (path_spec_fd_event(p, events) < 0)
2883                 goto fail;
2884
2885         if (service_retry_pid_file(s) == 0)
2886                 return 0;
2887
2888         if (service_watch_pid_file(s) < 0)
2889                 goto fail;
2890
2891         return 0;
2892
2893 fail:
2894         service_unwatch_pid_file(s);
2895         service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2896         return 0;
2897 }
2898
2899 static void service_notify_cgroup_empty_event(Unit *u) {
2900         Service *s = SERVICE(u);
2901
2902         assert(u);
2903
2904         log_debug_unit(u->id, "%s: cgroup is empty", u->id);
2905
2906         switch (s->state) {
2907
2908                 /* Waiting for SIGCHLD is usually more interesting,
2909                  * because it includes return codes/signals. Which is
2910                  * why we ignore the cgroup events for most cases,
2911                  * except when we don't know pid which to expect the
2912                  * SIGCHLD for. */
2913
2914         case SERVICE_START:
2915         case SERVICE_START_POST:
2916                 /* If we were hoping for the daemon to write its PID file,
2917                  * we can give up now. */
2918                 if (s->pid_file_pathspec) {
2919                         log_warning_unit(u->id,
2920                                          "%s never wrote its PID file. Failing.", UNIT(s)->id);
2921                         service_unwatch_pid_file(s);
2922                         if (s->state == SERVICE_START)
2923                                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
2924                         else
2925                                 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2926                 }
2927                 break;
2928
2929         case SERVICE_RUNNING:
2930                 /* service_enter_running() will figure out what to do */
2931                 service_enter_running(s, SERVICE_SUCCESS);
2932                 break;
2933
2934         case SERVICE_STOP_SIGTERM:
2935         case SERVICE_STOP_SIGKILL:
2936
2937                 if (main_pid_good(s) <= 0 && !control_pid_good(s))
2938                         service_enter_stop_post(s, SERVICE_SUCCESS);
2939
2940                 break;
2941
2942         case SERVICE_STOP_POST:
2943         case SERVICE_FINAL_SIGTERM:
2944         case SERVICE_FINAL_SIGKILL:
2945                 if (main_pid_good(s) <= 0 && !control_pid_good(s))
2946                         service_enter_dead(s, SERVICE_SUCCESS, true);
2947
2948                 break;
2949
2950         default:
2951                 ;
2952         }
2953 }
2954
2955 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
2956         Service *s = SERVICE(u);
2957         ServiceResult f;
2958
2959         assert(s);
2960         assert(pid >= 0);
2961
2962         if (UNIT(s)->fragment_path ? is_clean_exit(code, status, &s->success_status) :
2963                                      is_clean_exit_lsb(code, status, &s->success_status))
2964                 f = SERVICE_SUCCESS;
2965         else if (code == CLD_EXITED)
2966                 f = SERVICE_FAILURE_EXIT_CODE;
2967         else if (code == CLD_KILLED)
2968                 f = SERVICE_FAILURE_SIGNAL;
2969         else if (code == CLD_DUMPED)
2970                 f = SERVICE_FAILURE_CORE_DUMP;
2971         else
2972                 assert_not_reached("Unknown code");
2973
2974         if (s->main_pid == pid) {
2975                 /* Forking services may occasionally move to a new PID.
2976                  * As long as they update the PID file before exiting the old
2977                  * PID, they're fine. */
2978                 if (service_load_pid_file(s, false) == 0)
2979                         return;
2980
2981                 s->main_pid = 0;
2982                 exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status);
2983
2984                 if (s->main_command) {
2985                         /* If this is not a forking service than the
2986                          * main process got started and hence we copy
2987                          * the exit status so that it is recorded both
2988                          * as main and as control process exit
2989                          * status */
2990
2991                         s->main_command->exec_status = s->main_exec_status;
2992
2993                         if (s->main_command->ignore)
2994                                 f = SERVICE_SUCCESS;
2995                 } else if (s->exec_command[SERVICE_EXEC_START]) {
2996
2997                         /* If this is a forked process, then we should
2998                          * ignore the return value if this was
2999                          * configured for the starter process */
3000
3001                         if (s->exec_command[SERVICE_EXEC_START]->ignore)
3002                                 f = SERVICE_SUCCESS;
3003                 }
3004
3005                 log_struct_unit(f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3006                            u->id,
3007                            "MESSAGE=%s: main process exited, code=%s, status=%i/%s",
3008                                   u->id, sigchld_code_to_string(code), status,
3009                                   strna(code == CLD_EXITED
3010                                         ? exit_status_to_string(status, EXIT_STATUS_FULL)
3011                                         : signal_to_string(status)),
3012                            "EXIT_CODE=%s", sigchld_code_to_string(code),
3013                            "EXIT_STATUS=%i", status,
3014                            NULL);
3015
3016                 if (f != SERVICE_SUCCESS)
3017                         s->result = f;
3018
3019                 if (s->main_command &&
3020                     s->main_command->command_next &&
3021                     f == SERVICE_SUCCESS) {
3022
3023                         /* There is another command to *
3024                          * execute, so let's do that. */
3025
3026                         log_debug_unit(u->id,
3027                                        "%s running next main command for state %s",
3028                                        u->id, service_state_to_string(s->state));
3029                         service_run_next_main(s);
3030
3031                 } else {
3032
3033                         /* The service exited, so the service is officially
3034                          * gone. */
3035                         s->main_command = NULL;
3036
3037                         switch (s->state) {
3038
3039                         case SERVICE_START_POST:
3040                         case SERVICE_RELOAD:
3041                         case SERVICE_STOP:
3042                                 /* Need to wait until the operation is
3043                                  * done */
3044                                 break;
3045
3046                         case SERVICE_START:
3047                                 if (s->type == SERVICE_ONESHOT) {
3048                                         /* This was our main goal, so let's go on */
3049                                         if (f == SERVICE_SUCCESS)
3050                                                 service_enter_start_post(s);
3051                                         else
3052                                                 service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
3053                                         break;
3054                                 }
3055
3056                                 /* Fall through */
3057
3058                         case SERVICE_RUNNING:
3059                                 service_enter_running(s, f);
3060                                 break;
3061
3062                         case SERVICE_STOP_SIGTERM:
3063                         case SERVICE_STOP_SIGKILL:
3064
3065                                 if (!control_pid_good(s))
3066                                         service_enter_stop_post(s, f);
3067
3068                                 /* If there is still a control process, wait for that first */
3069                                 break;
3070
3071                         case SERVICE_STOP_POST:
3072                         case SERVICE_FINAL_SIGTERM:
3073                         case SERVICE_FINAL_SIGKILL:
3074
3075                                 if (!control_pid_good(s))
3076                                         service_enter_dead(s, f, true);
3077                                 break;
3078
3079                         default:
3080                                 assert_not_reached("Uh, main process died at wrong time.");
3081                         }
3082                 }
3083
3084         } else if (s->control_pid == pid) {
3085                 s->control_pid = 0;
3086
3087                 if (s->control_command) {
3088                         exec_status_exit(&s->control_command->exec_status,
3089                                          &s->exec_context, pid, code, status);
3090
3091                         if (s->control_command->ignore)
3092                                 f = SERVICE_SUCCESS;
3093                 }
3094
3095                 log_full_unit(f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE, u->id,
3096                               "%s: control process exited, code=%s status=%i",
3097                               u->id, sigchld_code_to_string(code), status);
3098
3099                 if (f != SERVICE_SUCCESS)
3100                         s->result = f;
3101
3102                 /* Immediately get rid of the cgroup, so that the
3103                  * kernel doesn't delay the cgroup empty messages for
3104                  * the service cgroup any longer than necessary */
3105                 service_kill_control_processes(s);
3106
3107                 if (s->control_command &&
3108                     s->control_command->command_next &&
3109                     f == SERVICE_SUCCESS) {
3110
3111                         /* There is another command to *
3112                          * execute, so let's do that. */
3113
3114                         log_debug_unit(u->id,
3115                                        "%s running next control command for state %s",
3116                                        u->id, service_state_to_string(s->state));
3117                         service_run_next_control(s);
3118
3119                 } else {
3120                         /* No further commands for this step, so let's
3121                          * figure out what to do next */
3122
3123                         s->control_command = NULL;
3124                         s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
3125
3126                         log_debug_unit(u->id,
3127                                        "%s got final SIGCHLD for state %s",
3128                                        u->id, service_state_to_string(s->state));
3129
3130                         switch (s->state) {
3131
3132                         case SERVICE_START_PRE:
3133                                 if (f == SERVICE_SUCCESS)
3134                                         service_enter_start(s);
3135                                 else
3136                                         service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
3137                                 break;
3138
3139                         case SERVICE_START:
3140                                 if (s->type != SERVICE_FORKING)
3141                                         /* Maybe spurious event due to a reload that changed the type? */
3142                                         break;
3143
3144                                 if (f != SERVICE_SUCCESS) {
3145                                         service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
3146                                         break;
3147                                &