1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/epoll.h>
26 #include <sys/timerfd.h>
35 #include "load-fragment.h"
36 #include "load-dropin.h"
38 #include "unit-name.h"
39 #include "specifier.h"
40 #include "dbus-unit.h"
42 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
43 [UNIT_SERVICE] = &service_vtable,
44 [UNIT_TIMER] = &timer_vtable,
45 [UNIT_SOCKET] = &socket_vtable,
46 [UNIT_TARGET] = &target_vtable,
47 [UNIT_DEVICE] = &device_vtable,
48 [UNIT_MOUNT] = &mount_vtable,
49 [UNIT_AUTOMOUNT] = &automount_vtable,
50 [UNIT_SNAPSHOT] = &snapshot_vtable,
51 [UNIT_SWAP] = &swap_vtable
54 Unit *unit_new(Manager *m) {
59 if (!(u = new0(Unit, 1)))
62 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
68 u->meta.type = _UNIT_TYPE_INVALID;
73 bool unit_has_name(Unit *u, const char *name) {
77 return !!set_get(u->meta.names, (char*) name);
80 int unit_add_name(Unit *u, const char *text) {
82 char *s = NULL, *i = NULL;
88 if (unit_name_is_template(text)) {
89 if (!u->meta.instance)
92 s = unit_name_replace_instance(text, u->meta.instance);
99 if (!unit_name_is_valid(s)) {
104 assert_se((t = unit_name_to_type(s)) >= 0);
106 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
111 if ((r = unit_name_to_instance(s, &i)) < 0)
114 if (i && unit_vtable[t]->no_instances)
117 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
122 if (unit_vtable[t]->no_alias &&
123 !set_isempty(u->meta.names) &&
124 !set_get(u->meta.names, s)) {
129 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
134 if ((r = set_put(u->meta.names, s)) < 0) {
140 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
141 set_remove(u->meta.names, s);
145 if (u->meta.type == _UNIT_TYPE_INVALID) {
149 u->meta.instance = i;
151 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
153 if (UNIT_VTABLE(u)->init)
154 UNIT_VTABLE(u)->init(u);
158 unit_add_to_dbus_queue(u);
168 int unit_choose_id(Unit *u, const char *name) {
174 if (unit_name_is_template(name)) {
176 if (!u->meta.instance)
179 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
185 /* Selects one of the names of this unit as the id */
186 s = set_get(u->meta.names, (char*) name);
193 unit_add_to_dbus_queue(u);
198 int unit_set_description(Unit *u, const char *description) {
203 if (!(s = strdup(description)))
206 free(u->meta.description);
207 u->meta.description = s;
209 unit_add_to_dbus_queue(u);
213 bool unit_check_gc(Unit *u) {
216 if (UNIT_VTABLE(u)->no_gc)
222 if (unit_active_state(u) != UNIT_INACTIVE)
225 if (UNIT_VTABLE(u)->check_gc)
226 if (UNIT_VTABLE(u)->check_gc(u))
232 void unit_add_to_load_queue(Unit *u) {
234 assert(u->meta.type != _UNIT_TYPE_INVALID);
236 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
239 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
240 u->meta.in_load_queue = true;
243 void unit_add_to_cleanup_queue(Unit *u) {
246 if (u->meta.in_cleanup_queue)
249 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
250 u->meta.in_cleanup_queue = true;
253 void unit_add_to_gc_queue(Unit *u) {
256 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
259 if (unit_check_gc(u))
262 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
263 u->meta.in_gc_queue = true;
265 u->meta.manager->n_in_gc_queue ++;
267 if (u->meta.manager->gc_queue_timestamp <= 0)
268 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
271 void unit_add_to_dbus_queue(Unit *u) {
273 assert(u->meta.type != _UNIT_TYPE_INVALID);
275 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
278 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
279 u->meta.in_dbus_queue = true;
282 static void bidi_set_free(Unit *u, Set *s) {
288 /* Frees the set and makes sure we are dropped from the
289 * inverse pointers */
291 SET_FOREACH(other, s, i) {
294 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
295 set_remove(other->meta.dependencies[d], u);
297 unit_add_to_gc_queue(other);
303 void unit_free(Unit *u) {
310 bus_unit_send_removed_signal(u);
312 /* Detach from next 'bigger' objects */
313 SET_FOREACH(t, u->meta.names, i)
314 hashmap_remove_value(u->meta.manager->units, t, u);
316 if (u->meta.type != _UNIT_TYPE_INVALID)
317 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
319 if (u->meta.in_load_queue)
320 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
322 if (u->meta.in_dbus_queue)
323 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
325 if (u->meta.in_cleanup_queue)
326 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
328 if (u->meta.in_gc_queue) {
329 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
330 u->meta.manager->n_in_gc_queue--;
333 /* Free data and next 'smaller' objects */
335 job_free(u->meta.job);
337 if (u->meta.load_state != UNIT_STUB)
338 if (UNIT_VTABLE(u)->done)
339 UNIT_VTABLE(u)->done(u);
341 cgroup_bonding_free_list(u->meta.cgroup_bondings);
343 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
344 bidi_set_free(u, u->meta.dependencies[d]);
346 free(u->meta.description);
347 free(u->meta.fragment_path);
349 while ((t = set_steal_first(u->meta.names)))
351 set_free(u->meta.names);
353 free(u->meta.instance);
358 UnitActiveState unit_active_state(Unit *u) {
361 if (u->meta.load_state != UNIT_LOADED)
362 return UNIT_INACTIVE;
364 return UNIT_VTABLE(u)->active_state(u);
367 const char* unit_sub_state_to_string(Unit *u) {
370 return UNIT_VTABLE(u)->sub_state_to_string(u);
373 static void complete_move(Set **s, Set **other) {
381 set_move(*s, *other);
388 static void merge_names(Unit *u, Unit *other) {
395 complete_move(&u->meta.names, &other->meta.names);
397 while ((t = set_steal_first(other->meta.names)))
400 set_free(other->meta.names);
401 other->meta.names = NULL;
402 other->meta.id = NULL;
404 SET_FOREACH(t, u->meta.names, i)
405 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
408 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
415 assert(d < _UNIT_DEPENDENCY_MAX);
417 SET_FOREACH(back, other->meta.dependencies[d], i) {
420 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
421 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
424 set_remove(back->meta.dependencies[k], other);
426 assert(r == -ENOENT);
430 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
432 set_free(other->meta.dependencies[d]);
433 other->meta.dependencies[d] = NULL;
436 int unit_merge(Unit *u, Unit *other) {
441 assert(u->meta.manager == other->meta.manager);
442 assert(u->meta.type != _UNIT_TYPE_INVALID);
444 other = unit_follow_merge(other);
449 if (u->meta.type != other->meta.type)
452 if (!streq_ptr(u->meta.instance, other->meta.instance))
455 if (other->meta.load_state != UNIT_STUB &&
456 other->meta.load_state != UNIT_FAILED)
462 if (unit_active_state(other) != UNIT_INACTIVE)
466 merge_names(u, other);
468 /* Merge dependencies */
469 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
470 merge_dependencies(u, other, d);
472 other->meta.load_state = UNIT_MERGED;
473 other->meta.merged_into = u;
475 /* If there is still some data attached to the other node, we
476 * don't need it anymore, and can free it. */
477 if (other->meta.load_state != UNIT_STUB)
478 if (UNIT_VTABLE(other)->done)
479 UNIT_VTABLE(other)->done(other);
481 unit_add_to_dbus_queue(u);
482 unit_add_to_cleanup_queue(other);
487 int unit_merge_by_name(Unit *u, const char *name) {
495 if (unit_name_is_template(name)) {
496 if (!u->meta.instance)
499 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
505 if (!(other = manager_get_unit(u->meta.manager, name)))
506 r = unit_add_name(u, name);
508 r = unit_merge(u, other);
514 Unit* unit_follow_merge(Unit *u) {
517 while (u->meta.load_state == UNIT_MERGED)
518 assert_se(u = u->meta.merged_into);
523 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
529 if (c->std_output != EXEC_OUTPUT_KERNEL && c->std_output != EXEC_OUTPUT_SYSLOG)
532 /* If syslog or kernel logging is requested, make sure our own
533 * logging daemon is run first. */
535 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
538 if (u->meta.manager->running_as != MANAGER_SESSION)
539 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
545 const char *unit_description(Unit *u) {
548 if (u->meta.description)
549 return u->meta.description;
554 void unit_dump(Unit *u, FILE *f, const char *prefix) {
561 char timestamp1[FORMAT_TIMESTAMP_MAX], timestamp2[FORMAT_TIMESTAMP_MAX];
564 assert(u->meta.type >= 0);
568 p2 = strappend(prefix, "\t");
569 prefix2 = p2 ? p2 : prefix;
573 "%s\tDescription: %s\n"
575 "%s\tUnit Load State: %s\n"
576 "%s\tUnit Active State: %s\n"
577 "%s\tActive Enter Timestamp: %s\n"
578 "%s\tActive Exit Timestamp: %s\n"
579 "%s\tGC Check Good: %s\n",
581 prefix, unit_description(u),
582 prefix, strna(u->meta.instance),
583 prefix, unit_load_state_to_string(u->meta.load_state),
584 prefix, unit_active_state_to_string(unit_active_state(u)),
585 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.active_enter_timestamp)),
586 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_exit_timestamp)),
587 prefix, yes_no(unit_check_gc(u)));
589 SET_FOREACH(t, u->meta.names, i)
590 fprintf(f, "%s\tName: %s\n", prefix, t);
592 if (u->meta.fragment_path)
593 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
595 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
598 SET_FOREACH(other, u->meta.dependencies[d], i)
599 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
602 if (u->meta.load_state == UNIT_LOADED) {
604 "%s\tRecursive Stop: %s\n"
605 "%s\tStop When Unneeded: %s\n",
606 prefix, yes_no(u->meta.recursive_stop),
607 prefix, yes_no(u->meta.stop_when_unneeded));
609 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
610 fprintf(f, "%s\tControlGroup: %s:%s\n",
611 prefix, b->controller, b->path);
613 if (UNIT_VTABLE(u)->dump)
614 UNIT_VTABLE(u)->dump(u, f, prefix2);
616 } else if (u->meta.load_state == UNIT_MERGED)
618 "%s\tMerged into: %s\n",
619 prefix, u->meta.merged_into->meta.id);
622 job_dump(u->meta.job, f, prefix2);
627 /* Common implementation for multiple backends */
628 int unit_load_fragment_and_dropin(Unit *u) {
633 /* Load a .service file */
634 if ((r = unit_load_fragment(u)) < 0)
637 if (u->meta.load_state == UNIT_STUB)
640 /* Load drop-in directory data */
641 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
647 /* Common implementation for multiple backends */
648 int unit_load_fragment_and_dropin_optional(Unit *u) {
653 /* Same as unit_load_fragment_and_dropin(), but whether
654 * something can be loaded or not doesn't matter. */
656 /* Load a .service file */
657 if ((r = unit_load_fragment(u)) < 0)
660 if (u->meta.load_state == UNIT_STUB)
661 u->meta.load_state = UNIT_LOADED;
663 /* Load drop-in directory data */
664 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
670 /* Common implementation for multiple backends */
671 int unit_load_nop(Unit *u) {
674 if (u->meta.load_state == UNIT_STUB)
675 u->meta.load_state = UNIT_LOADED;
680 int unit_load(Unit *u) {
685 if (u->meta.in_load_queue) {
686 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
687 u->meta.in_load_queue = false;
690 if (u->meta.type == _UNIT_TYPE_INVALID)
693 if (u->meta.load_state != UNIT_STUB)
696 if (UNIT_VTABLE(u)->load)
697 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
700 if (u->meta.load_state == UNIT_STUB) {
705 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
707 unit_add_to_dbus_queue(unit_follow_merge(u));
708 unit_add_to_gc_queue(u);
713 u->meta.load_state = UNIT_FAILED;
714 unit_add_to_dbus_queue(u);
716 log_error("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
722 * -EBADR: This unit type does not support starting.
723 * -EALREADY: Unit is already started.
724 * -EAGAIN: An operation is already in progress. Retry later.
726 int unit_start(Unit *u) {
727 UnitActiveState state;
731 /* If this is already (being) started, then this will
732 * succeed. Note that this will even succeed if this unit is
733 * not startable by the user. This is relied on to detect when
734 * we need to wait for units and when waiting is finished. */
735 state = unit_active_state(u);
736 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
739 /* If it is stopped, but we cannot start it, then fail */
740 if (!UNIT_VTABLE(u)->start)
743 /* We don't suppress calls to ->start() here when we are
744 * already starting, to allow this request to be used as a
745 * "hurry up" call, for example when the unit is in some "auto
746 * restart" state where it waits for a holdoff timer to elapse
747 * before it will start again. */
749 unit_add_to_dbus_queue(u);
750 return UNIT_VTABLE(u)->start(u);
753 bool unit_can_start(Unit *u) {
756 return !!UNIT_VTABLE(u)->start;
760 * -EBADR: This unit type does not support stopping.
761 * -EALREADY: Unit is already stopped.
762 * -EAGAIN: An operation is already in progress. Retry later.
764 int unit_stop(Unit *u) {
765 UnitActiveState state;
769 state = unit_active_state(u);
770 if (state == UNIT_INACTIVE)
773 if (!UNIT_VTABLE(u)->stop)
776 unit_add_to_dbus_queue(u);
777 return UNIT_VTABLE(u)->stop(u);
781 * -EBADR: This unit type does not support reloading.
782 * -ENOEXEC: Unit is not started.
783 * -EAGAIN: An operation is already in progress. Retry later.
785 int unit_reload(Unit *u) {
786 UnitActiveState state;
790 if (!unit_can_reload(u))
793 state = unit_active_state(u);
794 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
797 if (unit_active_state(u) != UNIT_ACTIVE)
800 unit_add_to_dbus_queue(u);
801 return UNIT_VTABLE(u)->reload(u);
804 bool unit_can_reload(Unit *u) {
807 if (!UNIT_VTABLE(u)->reload)
810 if (!UNIT_VTABLE(u)->can_reload)
813 return UNIT_VTABLE(u)->can_reload(u);
816 static void unit_check_uneeded(Unit *u) {
822 /* If this service shall be shut down when unneeded then do
825 if (!u->meta.stop_when_unneeded)
828 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
831 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
832 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
835 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
836 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
839 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
840 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
843 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
845 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
846 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
849 static void retroactively_start_dependencies(Unit *u) {
854 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
856 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
857 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
858 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
860 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
861 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
862 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
864 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
865 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
866 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
868 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
869 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
870 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
872 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
873 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
874 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
877 static void retroactively_stop_dependencies(Unit *u) {
882 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
884 if (u->meta.recursive_stop) {
885 /* Pull down units need us recursively if enabled */
886 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
887 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
888 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
891 /* Garbage collect services that might not be needed anymore, if enabled */
892 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
893 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
894 unit_check_uneeded(other);
895 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
896 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
897 unit_check_uneeded(other);
898 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
899 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
900 unit_check_uneeded(other);
901 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
902 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
903 unit_check_uneeded(other);
904 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
905 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
906 unit_check_uneeded(other);
909 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
910 bool unexpected = false;
913 assert(os < _UNIT_ACTIVE_STATE_MAX);
914 assert(ns < _UNIT_ACTIVE_STATE_MAX);
916 /* Note that this is called for all low-level state changes,
917 * even if they might map to the same high-level
918 * UnitActiveState! That means that ns == os is OK an expected
919 * behaviour here. For example: if a mount point is remounted
920 * this function will be called too and the utmp code below
923 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
924 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
925 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
926 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
930 if (u->meta.job->state == JOB_WAITING)
932 /* So we reached a different state for this
933 * job. Let's see if we can run it now if it
934 * failed previously due to EAGAIN. */
935 job_add_to_run_queue(u->meta.job);
938 assert(u->meta.job->state == JOB_RUNNING);
940 /* Let's check whether this state change
941 * constitutes a finished job, or maybe
942 * cotradicts a running job and hence needs to
943 * invalidate jobs. */
945 switch (u->meta.job->type) {
948 case JOB_VERIFY_ACTIVE:
950 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
951 job_finish_and_invalidate(u->meta.job, true);
952 else if (ns != UNIT_ACTIVATING) {
954 job_finish_and_invalidate(u->meta.job, false);
960 case JOB_RELOAD_OR_START:
962 if (ns == UNIT_ACTIVE)
963 job_finish_and_invalidate(u->meta.job, true);
964 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
966 job_finish_and_invalidate(u->meta.job, false);
973 case JOB_TRY_RESTART:
975 if (ns == UNIT_INACTIVE)
976 job_finish_and_invalidate(u->meta.job, true);
977 else if (ns != UNIT_DEACTIVATING) {
979 job_finish_and_invalidate(u->meta.job, false);
985 assert_not_reached("Job type unknown");
990 /* If this state change happened without being requested by a
991 * job, then let's retroactively start or stop dependencies */
994 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
995 retroactively_start_dependencies(u);
996 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
997 retroactively_stop_dependencies(u);
1000 /* Some names are special */
1001 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1002 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
1003 /* The bus just might have become available,
1004 * hence try to connect to it, if we aren't
1006 bus_init_system(u->meta.manager);
1007 bus_init_api(u->meta.manager);
1010 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1011 /* The syslog daemon just might have become
1012 * available, hence try to connect to it, if
1013 * we aren't yet connected. */
1016 if (u->meta.type == UNIT_MOUNT)
1017 /* Another directory became available, let's
1018 * check if that is enough to write our utmp
1020 manager_write_utmp_reboot(u->meta.manager);
1022 if (u->meta.type == UNIT_TARGET)
1023 /* A target got activated, maybe this is a runlevel? */
1024 manager_write_utmp_runlevel(u->meta.manager, u);
1026 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1028 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1029 /* The syslog daemon might just have
1030 * terminated, hence try to disconnect from
1034 /* We don't care about D-Bus here, since we'll get an
1035 * asynchronous notification for it anyway. */
1038 /* Maybe we finished startup and are now ready for being
1039 * stopped because unneeded? */
1040 unit_check_uneeded(u);
1042 unit_add_to_dbus_queue(u);
1043 unit_add_to_gc_queue(u);
1046 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1047 struct epoll_event ev;
1052 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1058 if (epoll_ctl(u->meta.manager->epoll_fd,
1059 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1071 void unit_unwatch_fd(Unit *u, Watch *w) {
1075 if (w->type == WATCH_INVALID)
1078 assert(w->type == WATCH_FD);
1079 assert(w->data.unit == u);
1080 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1083 w->type = WATCH_INVALID;
1084 w->data.unit = NULL;
1087 int unit_watch_pid(Unit *u, pid_t pid) {
1091 /* Watch a specific PID. We only support one unit watching
1092 * each PID for now. */
1094 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1097 void unit_unwatch_pid(Unit *u, pid_t pid) {
1101 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1104 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1105 struct itimerspec its;
1111 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1113 /* This will try to reuse the old timer if there is one */
1115 if (w->type == WATCH_TIMER) {
1120 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1127 /* Set absolute time in the past, but not 0, since we
1128 * don't want to disarm the timer */
1129 its.it_value.tv_sec = 0;
1130 its.it_value.tv_nsec = 1;
1132 flags = TFD_TIMER_ABSTIME;
1134 timespec_store(&its.it_value, delay);
1138 /* This will also flush the elapse counter */
1139 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1142 if (w->type == WATCH_INVALID) {
1143 struct epoll_event ev;
1147 ev.events = EPOLLIN;
1149 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1154 w->type = WATCH_TIMER;
1161 close_nointr_nofail(fd);
1166 void unit_unwatch_timer(Unit *u, Watch *w) {
1170 if (w->type == WATCH_INVALID)
1173 assert(w->type == WATCH_TIMER && w->data.unit == u);
1175 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1176 close_nointr_nofail(w->fd);
1179 w->type = WATCH_INVALID;
1180 w->data.unit = NULL;
1183 bool unit_job_is_applicable(Unit *u, JobType j) {
1185 assert(j >= 0 && j < _JOB_TYPE_MAX);
1189 case JOB_VERIFY_ACTIVE:
1195 case JOB_TRY_RESTART:
1196 return unit_can_start(u);
1199 return unit_can_reload(u);
1201 case JOB_RELOAD_OR_START:
1202 return unit_can_reload(u) && unit_can_start(u);
1205 assert_not_reached("Invalid job type");
1209 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1211 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1212 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1213 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1214 [UNIT_WANTS] = UNIT_WANTED_BY,
1215 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1216 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1217 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1218 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1219 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1220 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1221 [UNIT_BEFORE] = UNIT_AFTER,
1222 [UNIT_AFTER] = UNIT_BEFORE,
1223 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1224 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1226 int r, q = 0, v = 0, w = 0;
1229 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1230 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1233 /* We won't allow dependencies on ourselves. We will not
1234 * consider them an error however. */
1238 if (UNIT_VTABLE(u)->no_requires &&
1239 (d == UNIT_REQUIRES ||
1240 d == UNIT_REQUIRES_OVERRIDABLE ||
1241 d == UNIT_REQUISITE ||
1242 d == UNIT_REQUISITE_OVERRIDABLE)) {
1246 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0 ||
1247 (r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1251 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1252 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1255 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1258 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1263 if (add_reference) {
1264 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1269 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1273 unit_add_to_dbus_queue(u);
1278 set_remove(u->meta.dependencies[d], other);
1281 set_remove(other->meta.dependencies[inverse_table[d]], u);
1284 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1289 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1293 assert(name || path);
1296 name = file_name_from_path(path);
1298 if (!unit_name_is_template(name)) {
1303 if (u->meta.instance)
1304 s = unit_name_replace_instance(name, u->meta.instance);
1308 if (!(i = unit_name_to_prefix(u->meta.id)))
1311 s = unit_name_replace_instance(name, i);
1322 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1328 assert(name || path);
1330 if (!(name = resolve_template(u, name, path, &s)))
1333 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1336 r = unit_add_dependency(u, d, other, add_reference);
1343 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1349 assert(name || path);
1351 if (!(name = resolve_template(u, name, path, &s)))
1354 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1357 r = unit_add_dependency(other, d, u, add_reference);
1364 int set_unit_path(const char *p) {
1368 /* This is mostly for debug purposes */
1370 if (path_is_absolute(p)) {
1371 if (!(c = strdup(p)))
1374 if (!(cwd = get_current_dir_name()))
1377 r = asprintf(&c, "%s/%s", cwd, p);
1384 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1393 char *unit_dbus_path(Unit *u) {
1398 if (!(e = bus_path_escape(u->meta.id)))
1401 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1410 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1418 /* Ensure this hasn't been added yet */
1421 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1422 LIST_PREPEND(CGroupBonding, by_path, l, b);
1424 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1425 LIST_REMOVE(CGroupBonding, by_path, l, b);
1429 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1435 static char *default_cgroup_path(Unit *u) {
1441 if (u->meta.instance) {
1444 if (!(t = unit_name_template(u->meta.id)))
1447 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1450 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1452 return r < 0 ? NULL : p;
1455 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1457 char *controller = NULL, *path = NULL;
1458 CGroupBonding *b = NULL;
1464 /* Detect controller name */
1465 n = strcspn(name, ":");
1468 (name[n] == ':' && name[n+1] == 0)) {
1470 /* Only controller name, no path? */
1472 if (!(path = default_cgroup_path(u)))
1478 /* Controller name, and path. */
1481 if (!path_is_absolute(p))
1484 if (!(path = strdup(p)))
1489 controller = strndup(name, n);
1491 controller = strdup(u->meta.manager->cgroup_controller);
1498 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1503 if (!(b = new0(CGroupBonding, 1))) {
1508 b->controller = controller;
1511 b->clean_up = false;
1513 if ((r = unit_add_cgroup(u, b)) < 0)
1526 int unit_add_default_cgroup(Unit *u) {
1532 /* Adds in the default cgroup data, if it wasn't specified yet */
1534 if (unit_get_default_cgroup(u))
1537 if (!(b = new0(CGroupBonding, 1)))
1540 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1543 if (!(b->path = default_cgroup_path(u)))
1549 if ((r = unit_add_cgroup(u, b)) < 0)
1556 free(b->controller);
1562 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1565 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1568 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1576 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1579 assert(!unit_has_name(u, t));
1581 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1584 assert(r < 0 || *_found != u);
1589 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1597 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1600 assert(!unit_has_name(u, t));
1602 found = manager_get_unit(u->meta.manager, t);
1612 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1616 return unit_name_to_prefix_and_instance(u->meta.id);
1619 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1623 return unit_name_to_prefix(u->meta.id);
1626 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1632 if (!(p = unit_name_to_prefix(u->meta.id)))
1635 r = unit_name_unescape(p);
1641 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1645 if (u->meta.instance)
1646 return unit_name_unescape(u->meta.instance);
1651 char *unit_name_printf(Unit *u, const char* format) {
1654 * This will use the passed string as format string and
1655 * replace the following specifiers:
1657 * %n: the full id of the unit (foo@bar.waldo)
1658 * %N: the id of the unit without the suffix (foo@bar)
1659 * %p: the prefix (foo)
1660 * %i: the instance (bar)
1663 const Specifier table[] = {
1664 { 'n', specifier_string, u->meta.id },
1665 { 'N', specifier_prefix_and_instance, NULL },
1666 { 'p', specifier_prefix, NULL },
1667 { 'i', specifier_string, u->meta.instance },
1674 return specifier_printf(format, table, u);
1677 char *unit_full_printf(Unit *u, const char *format) {
1679 /* This is similar to unit_name_printf() but also supports
1682 const Specifier table[] = {
1683 { 'n', specifier_string, u->meta.id },
1684 { 'N', specifier_prefix_and_instance, NULL },
1685 { 'p', specifier_prefix, NULL },
1686 { 'P', specifier_prefix_unescaped, NULL },
1687 { 'i', specifier_string, u->meta.instance },
1688 { 'I', specifier_instance_unescaped, NULL },
1695 return specifier_printf(format, table, u);
1698 char **unit_full_printf_strv(Unit *u, char **l) {
1702 /* Applies unit_full_printf to every entry in l */
1707 if (!(r = new(char*, n+1)))
1710 for (i = l, j = r; *i; i++, j++)
1711 if (!(*j = unit_full_printf(u, *i)))
1727 int unit_watch_bus_name(Unit *u, const char *name) {
1731 /* Watch a specific name on the bus. We only support one unit
1732 * watching each name for now. */
1734 return hashmap_put(u->meta.manager->watch_bus, name, u);
1737 void unit_unwatch_bus_name(Unit *u, const char *name) {
1741 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1744 bool unit_can_serialize(Unit *u) {
1747 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1750 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1757 if (!unit_can_serialize(u))
1760 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1768 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1779 va_start(ap, format);
1780 vfprintf(f, format, ap);
1786 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1792 fprintf(f, "%s=%s\n", key, value);
1795 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1802 if (!unit_can_serialize(u))
1806 char line[1024], *l, *v;
1809 if (!fgets(line, sizeof(line), f)) {
1821 k = strcspn(l, "=");
1829 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1835 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1836 [UNIT_SERVICE] = "service",
1837 [UNIT_TIMER] = "timer",
1838 [UNIT_SOCKET] = "socket",
1839 [UNIT_TARGET] = "target",
1840 [UNIT_DEVICE] = "device",
1841 [UNIT_MOUNT] = "mount",
1842 [UNIT_AUTOMOUNT] = "automount",
1843 [UNIT_SNAPSHOT] = "snapshot",
1844 [UNIT_SWAP] = "swap"
1847 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1849 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1850 [UNIT_STUB] = "stub",
1851 [UNIT_LOADED] = "loaded",
1852 [UNIT_FAILED] = "failed",
1853 [UNIT_MERGED] = "merged"
1856 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1858 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1859 [UNIT_ACTIVE] = "active",
1860 [UNIT_INACTIVE] = "inactive",
1861 [UNIT_ACTIVATING] = "activating",
1862 [UNIT_DEACTIVATING] = "deactivating"
1865 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1867 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1868 [UNIT_REQUIRES] = "Requires",
1869 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1870 [UNIT_WANTS] = "Wants",
1871 [UNIT_REQUISITE] = "Requisite",
1872 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1873 [UNIT_REQUIRED_BY] = "RequiredBy",
1874 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1875 [UNIT_WANTED_BY] = "WantedBy",
1876 [UNIT_CONFLICTS] = "Conflicts",
1877 [UNIT_BEFORE] = "Before",
1878 [UNIT_AFTER] = "After",
1879 [UNIT_REFERENCES] = "References",
1880 [UNIT_REFERENCED_BY] = "ReferencedBy"
1883 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1885 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1886 [KILL_CONTROL_GROUP] = "control-group",
1887 [KILL_PROCESS_GROUP] = "process-group",
1888 [KILL_PROCESS] = "process",
1889 [KILL_NONE] = "none"
1892 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);