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,
52 [UNIT_PATH] = &path_vtable
55 Unit *unit_new(Manager *m) {
60 if (!(u = new0(Unit, 1)))
63 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
69 u->meta.type = _UNIT_TYPE_INVALID;
74 bool unit_has_name(Unit *u, const char *name) {
78 return !!set_get(u->meta.names, (char*) name);
81 int unit_add_name(Unit *u, const char *text) {
83 char *s = NULL, *i = NULL;
89 if (unit_name_is_template(text)) {
90 if (!u->meta.instance)
93 s = unit_name_replace_instance(text, u->meta.instance);
100 if (!unit_name_is_valid(s)) {
105 assert_se((t = unit_name_to_type(s)) >= 0);
107 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
112 if ((r = unit_name_to_instance(s, &i)) < 0)
115 if (i && unit_vtable[t]->no_instances)
118 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
123 if (unit_vtable[t]->no_alias &&
124 !set_isempty(u->meta.names) &&
125 !set_get(u->meta.names, s)) {
130 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
135 if ((r = set_put(u->meta.names, s)) < 0) {
141 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
142 set_remove(u->meta.names, s);
146 if (u->meta.type == _UNIT_TYPE_INVALID) {
150 u->meta.instance = i;
152 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
154 if (UNIT_VTABLE(u)->init)
155 UNIT_VTABLE(u)->init(u);
159 unit_add_to_dbus_queue(u);
169 int unit_choose_id(Unit *u, const char *name) {
175 if (unit_name_is_template(name)) {
177 if (!u->meta.instance)
180 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
186 /* Selects one of the names of this unit as the id */
187 s = set_get(u->meta.names, (char*) name);
194 unit_add_to_dbus_queue(u);
199 int unit_set_description(Unit *u, const char *description) {
204 if (!(s = strdup(description)))
207 free(u->meta.description);
208 u->meta.description = s;
210 unit_add_to_dbus_queue(u);
214 bool unit_check_gc(Unit *u) {
217 if (u->meta.load_state == UNIT_STUB)
220 if (UNIT_VTABLE(u)->no_gc)
226 if (unit_active_state(u) != UNIT_INACTIVE)
229 if (UNIT_VTABLE(u)->check_gc)
230 if (UNIT_VTABLE(u)->check_gc(u))
236 void unit_add_to_load_queue(Unit *u) {
238 assert(u->meta.type != _UNIT_TYPE_INVALID);
240 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
243 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
244 u->meta.in_load_queue = true;
247 void unit_add_to_cleanup_queue(Unit *u) {
250 if (u->meta.in_cleanup_queue)
253 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
254 u->meta.in_cleanup_queue = true;
257 void unit_add_to_gc_queue(Unit *u) {
260 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
263 if (unit_check_gc(u))
266 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
267 u->meta.in_gc_queue = true;
269 u->meta.manager->n_in_gc_queue ++;
271 if (u->meta.manager->gc_queue_timestamp <= 0)
272 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
275 void unit_add_to_dbus_queue(Unit *u) {
277 assert(u->meta.type != _UNIT_TYPE_INVALID);
279 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
282 if (set_isempty(u->meta.manager->subscribed)) {
283 u->meta.sent_dbus_new_signal = true;
287 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
288 u->meta.in_dbus_queue = true;
291 static void bidi_set_free(Unit *u, Set *s) {
297 /* Frees the set and makes sure we are dropped from the
298 * inverse pointers */
300 SET_FOREACH(other, s, i) {
303 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
304 set_remove(other->meta.dependencies[d], u);
306 unit_add_to_gc_queue(other);
312 void unit_free(Unit *u) {
319 bus_unit_send_removed_signal(u);
321 /* Detach from next 'bigger' objects */
322 SET_FOREACH(t, u->meta.names, i)
323 hashmap_remove_value(u->meta.manager->units, t, u);
325 if (u->meta.type != _UNIT_TYPE_INVALID)
326 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
328 if (u->meta.in_load_queue)
329 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
331 if (u->meta.in_dbus_queue)
332 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
334 if (u->meta.in_cleanup_queue)
335 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
337 if (u->meta.in_gc_queue) {
338 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
339 u->meta.manager->n_in_gc_queue--;
342 /* Free data and next 'smaller' objects */
344 job_free(u->meta.job);
346 if (u->meta.load_state != UNIT_STUB)
347 if (UNIT_VTABLE(u)->done)
348 UNIT_VTABLE(u)->done(u);
350 cgroup_bonding_free_list(u->meta.cgroup_bondings);
352 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
353 bidi_set_free(u, u->meta.dependencies[d]);
355 free(u->meta.description);
356 free(u->meta.fragment_path);
358 while ((t = set_steal_first(u->meta.names)))
360 set_free(u->meta.names);
362 free(u->meta.instance);
367 UnitActiveState unit_active_state(Unit *u) {
370 if (u->meta.load_state != UNIT_LOADED)
371 return UNIT_INACTIVE;
373 return UNIT_VTABLE(u)->active_state(u);
376 const char* unit_sub_state_to_string(Unit *u) {
379 return UNIT_VTABLE(u)->sub_state_to_string(u);
382 static void complete_move(Set **s, Set **other) {
390 set_move(*s, *other);
397 static void merge_names(Unit *u, Unit *other) {
404 complete_move(&u->meta.names, &other->meta.names);
406 while ((t = set_steal_first(other->meta.names)))
409 set_free(other->meta.names);
410 other->meta.names = NULL;
411 other->meta.id = NULL;
413 SET_FOREACH(t, u->meta.names, i)
414 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
417 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
424 assert(d < _UNIT_DEPENDENCY_MAX);
426 SET_FOREACH(back, other->meta.dependencies[d], i) {
429 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
430 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
433 set_remove(back->meta.dependencies[k], other);
435 assert(r == -ENOENT);
439 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
441 set_free(other->meta.dependencies[d]);
442 other->meta.dependencies[d] = NULL;
445 int unit_merge(Unit *u, Unit *other) {
450 assert(u->meta.manager == other->meta.manager);
451 assert(u->meta.type != _UNIT_TYPE_INVALID);
453 other = unit_follow_merge(other);
458 if (u->meta.type != other->meta.type)
461 if (!streq_ptr(u->meta.instance, other->meta.instance))
464 if (other->meta.load_state != UNIT_STUB &&
465 other->meta.load_state != UNIT_FAILED)
471 if (unit_active_state(other) != UNIT_INACTIVE)
475 merge_names(u, other);
477 /* Merge dependencies */
478 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
479 merge_dependencies(u, other, d);
481 other->meta.load_state = UNIT_MERGED;
482 other->meta.merged_into = u;
484 /* If there is still some data attached to the other node, we
485 * don't need it anymore, and can free it. */
486 if (other->meta.load_state != UNIT_STUB)
487 if (UNIT_VTABLE(other)->done)
488 UNIT_VTABLE(other)->done(other);
490 unit_add_to_dbus_queue(u);
491 unit_add_to_cleanup_queue(other);
496 int unit_merge_by_name(Unit *u, const char *name) {
504 if (unit_name_is_template(name)) {
505 if (!u->meta.instance)
508 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
514 if (!(other = manager_get_unit(u->meta.manager, name)))
515 r = unit_add_name(u, name);
517 r = unit_merge(u, other);
523 Unit* unit_follow_merge(Unit *u) {
526 while (u->meta.load_state == UNIT_MERGED)
527 assert_se(u = u->meta.merged_into);
532 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
538 if (c->std_output != EXEC_OUTPUT_KMSG &&
539 c->std_output != EXEC_OUTPUT_SYSLOG &&
540 c->std_error != EXEC_OUTPUT_KMSG &&
541 c->std_error != EXEC_OUTPUT_SYSLOG)
544 /* If syslog or kernel logging is requested, make sure our own
545 * logging daemon is run first. */
547 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
550 if (u->meta.manager->running_as != MANAGER_SESSION)
551 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
557 const char *unit_description(Unit *u) {
560 if (u->meta.description)
561 return u->meta.description;
566 void unit_dump(Unit *u, FILE *f, const char *prefix) {
574 timestamp1[FORMAT_TIMESTAMP_MAX],
575 timestamp2[FORMAT_TIMESTAMP_MAX],
576 timestamp3[FORMAT_TIMESTAMP_MAX],
577 timestamp4[FORMAT_TIMESTAMP_MAX];
580 assert(u->meta.type >= 0);
584 p2 = strappend(prefix, "\t");
585 prefix2 = p2 ? p2 : prefix;
589 "%s\tDescription: %s\n"
591 "%s\tUnit Load State: %s\n"
592 "%s\tUnit Active State: %s\n"
593 "%s\tInactive Exit Timestamp: %s\n"
594 "%s\tActive Enter Timestamp: %s\n"
595 "%s\tActive Exit Timestamp: %s\n"
596 "%s\tInactive Enter Timestamp: %s\n"
597 "%s\tGC Check Good: %s\n"
598 "%s\tOnly By Dependency: %s\n",
600 prefix, unit_description(u),
601 prefix, strna(u->meta.instance),
602 prefix, unit_load_state_to_string(u->meta.load_state),
603 prefix, unit_active_state_to_string(unit_active_state(u)),
604 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
605 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
606 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
607 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
608 prefix, yes_no(unit_check_gc(u)),
609 prefix, yes_no(u->meta.only_by_dependency));
611 SET_FOREACH(t, u->meta.names, i)
612 fprintf(f, "%s\tName: %s\n", prefix, t);
614 if (u->meta.fragment_path)
615 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
617 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
620 SET_FOREACH(other, u->meta.dependencies[d], i)
621 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
624 if (u->meta.load_state == UNIT_LOADED) {
626 "%s\tRecursive Stop: %s\n"
627 "%s\tStop When Unneeded: %s\n",
628 prefix, yes_no(u->meta.recursive_stop),
629 prefix, yes_no(u->meta.stop_when_unneeded));
631 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
632 fprintf(f, "%s\tControlGroup: %s:%s\n",
633 prefix, b->controller, b->path);
635 if (UNIT_VTABLE(u)->dump)
636 UNIT_VTABLE(u)->dump(u, f, prefix2);
638 } else if (u->meta.load_state == UNIT_MERGED)
640 "%s\tMerged into: %s\n",
641 prefix, u->meta.merged_into->meta.id);
644 job_dump(u->meta.job, f, prefix2);
649 /* Common implementation for multiple backends */
650 int unit_load_fragment_and_dropin(Unit *u) {
655 /* Load a .service file */
656 if ((r = unit_load_fragment(u)) < 0)
659 if (u->meta.load_state == UNIT_STUB)
662 /* Load drop-in directory data */
663 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
669 /* Common implementation for multiple backends */
670 int unit_load_fragment_and_dropin_optional(Unit *u) {
675 /* Same as unit_load_fragment_and_dropin(), but whether
676 * something can be loaded or not doesn't matter. */
678 /* Load a .service file */
679 if ((r = unit_load_fragment(u)) < 0)
682 if (u->meta.load_state == UNIT_STUB)
683 u->meta.load_state = UNIT_LOADED;
685 /* Load drop-in directory data */
686 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
692 /* Common implementation for multiple backends */
693 int unit_load_nop(Unit *u) {
696 if (u->meta.load_state == UNIT_STUB)
697 u->meta.load_state = UNIT_LOADED;
702 int unit_load(Unit *u) {
707 if (u->meta.in_load_queue) {
708 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
709 u->meta.in_load_queue = false;
712 if (u->meta.type == _UNIT_TYPE_INVALID)
715 if (u->meta.load_state != UNIT_STUB)
718 if (UNIT_VTABLE(u)->load)
719 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
722 if (u->meta.load_state == UNIT_STUB) {
727 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
729 unit_add_to_dbus_queue(unit_follow_merge(u));
730 unit_add_to_gc_queue(u);
735 u->meta.load_state = UNIT_FAILED;
736 unit_add_to_dbus_queue(u);
738 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
744 * -EBADR: This unit type does not support starting.
745 * -EALREADY: Unit is already started.
746 * -EAGAIN: An operation is already in progress. Retry later.
747 * -ECANCELED: Too many requests for now.
749 int unit_start(Unit *u) {
750 UnitActiveState state;
754 /* If this is already (being) started, then this will
755 * succeed. Note that this will even succeed if this unit is
756 * not startable by the user. This is relied on to detect when
757 * we need to wait for units and when waiting is finished. */
758 state = unit_active_state(u);
759 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
762 /* If it is stopped, but we cannot start it, then fail */
763 if (!UNIT_VTABLE(u)->start)
766 /* We don't suppress calls to ->start() here when we are
767 * already starting, to allow this request to be used as a
768 * "hurry up" call, for example when the unit is in some "auto
769 * restart" state where it waits for a holdoff timer to elapse
770 * before it will start again. */
772 unit_add_to_dbus_queue(u);
773 return UNIT_VTABLE(u)->start(u);
776 bool unit_can_start(Unit *u) {
779 return !!UNIT_VTABLE(u)->start;
783 * -EBADR: This unit type does not support stopping.
784 * -EALREADY: Unit is already stopped.
785 * -EAGAIN: An operation is already in progress. Retry later.
787 int unit_stop(Unit *u) {
788 UnitActiveState state;
792 state = unit_active_state(u);
793 if (state == UNIT_INACTIVE)
796 if (!UNIT_VTABLE(u)->stop)
799 unit_add_to_dbus_queue(u);
800 return UNIT_VTABLE(u)->stop(u);
804 * -EBADR: This unit type does not support reloading.
805 * -ENOEXEC: Unit is not started.
806 * -EAGAIN: An operation is already in progress. Retry later.
808 int unit_reload(Unit *u) {
809 UnitActiveState state;
813 if (!unit_can_reload(u))
816 state = unit_active_state(u);
817 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
820 if (unit_active_state(u) != UNIT_ACTIVE)
823 unit_add_to_dbus_queue(u);
824 return UNIT_VTABLE(u)->reload(u);
827 bool unit_can_reload(Unit *u) {
830 if (!UNIT_VTABLE(u)->reload)
833 if (!UNIT_VTABLE(u)->can_reload)
836 return UNIT_VTABLE(u)->can_reload(u);
839 static void unit_check_uneeded(Unit *u) {
845 /* If this service shall be shut down when unneeded then do
848 if (!u->meta.stop_when_unneeded)
851 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
854 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
855 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
858 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
859 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
862 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
863 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
866 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
868 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
869 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
872 static void retroactively_start_dependencies(Unit *u) {
877 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
879 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
880 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
881 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
883 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
884 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
885 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
887 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
888 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
889 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
891 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
892 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
893 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
895 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
896 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
897 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
900 static void retroactively_stop_dependencies(Unit *u) {
905 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
907 if (u->meta.recursive_stop) {
908 /* Pull down units need us recursively if enabled */
909 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
910 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
911 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
914 /* Garbage collect services that might not be needed anymore, if enabled */
915 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
916 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
917 unit_check_uneeded(other);
918 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
919 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
920 unit_check_uneeded(other);
921 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
922 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
923 unit_check_uneeded(other);
924 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
925 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
926 unit_check_uneeded(other);
927 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
928 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
929 unit_check_uneeded(other);
932 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
933 bool unexpected = false;
937 assert(os < _UNIT_ACTIVE_STATE_MAX);
938 assert(ns < _UNIT_ACTIVE_STATE_MAX);
940 /* Note that this is called for all low-level state changes,
941 * even if they might map to the same high-level
942 * UnitActiveState! That means that ns == os is OK an expected
943 * behaviour here. For example: if a mount point is remounted
944 * this function will be called too and the utmp code below
949 if (os == UNIT_INACTIVE && ns != UNIT_INACTIVE)
950 u->meta.inactive_exit_timestamp = ts;
951 else if (os != UNIT_INACTIVE && ns == UNIT_INACTIVE)
952 u->meta.inactive_enter_timestamp = ts;
954 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
955 u->meta.active_enter_timestamp = ts;
956 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
957 u->meta.active_exit_timestamp = ts;
959 timer_unit_notify(u, ns);
960 path_unit_notify(u, ns);
964 if (u->meta.job->state == JOB_WAITING)
966 /* So we reached a different state for this
967 * job. Let's see if we can run it now if it
968 * failed previously due to EAGAIN. */
969 job_add_to_run_queue(u->meta.job);
972 assert(u->meta.job->state == JOB_RUNNING);
974 /* Let's check whether this state change
975 * constitutes a finished job, or maybe
976 * cotradicts a running job and hence needs to
977 * invalidate jobs. */
979 switch (u->meta.job->type) {
982 case JOB_VERIFY_ACTIVE:
984 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
985 job_finish_and_invalidate(u->meta.job, true);
986 else if (ns != UNIT_ACTIVATING) {
988 job_finish_and_invalidate(u->meta.job, false);
994 case JOB_RELOAD_OR_START:
996 if (ns == UNIT_ACTIVE)
997 job_finish_and_invalidate(u->meta.job, true);
998 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
1000 job_finish_and_invalidate(u->meta.job, false);
1007 case JOB_TRY_RESTART:
1009 if (ns == UNIT_INACTIVE)
1010 job_finish_and_invalidate(u->meta.job, true);
1011 else if (ns != UNIT_DEACTIVATING) {
1013 job_finish_and_invalidate(u->meta.job, false);
1019 assert_not_reached("Job type unknown");
1024 /* If this state change happened without being requested by a
1025 * job, then let's retroactively start or stop dependencies */
1028 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1029 retroactively_start_dependencies(u);
1030 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1031 retroactively_stop_dependencies(u);
1034 /* Some names are special */
1035 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1036 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
1037 /* The bus just might have become available,
1038 * hence try to connect to it, if we aren't
1040 bus_init_system(u->meta.manager);
1041 bus_init_api(u->meta.manager);
1044 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1045 /* The syslog daemon just might have become
1046 * available, hence try to connect to it, if
1047 * we aren't yet connected. */
1050 if (u->meta.type == UNIT_MOUNT)
1051 /* Another directory became available, let's
1052 * check if that is enough to write our utmp
1054 manager_write_utmp_reboot(u->meta.manager);
1056 if (u->meta.type == UNIT_TARGET)
1057 /* A target got activated, maybe this is a runlevel? */
1058 manager_write_utmp_runlevel(u->meta.manager, u);
1060 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1062 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1063 /* The syslog daemon might just have
1064 * terminated, hence try to disconnect from
1068 /* We don't care about D-Bus here, since we'll get an
1069 * asynchronous notification for it anyway. */
1072 /* Maybe we finished startup and are now ready for being
1073 * stopped because unneeded? */
1074 unit_check_uneeded(u);
1076 unit_add_to_dbus_queue(u);
1077 unit_add_to_gc_queue(u);
1080 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1081 struct epoll_event ev;
1086 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1092 if (epoll_ctl(u->meta.manager->epoll_fd,
1093 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1105 void unit_unwatch_fd(Unit *u, Watch *w) {
1109 if (w->type == WATCH_INVALID)
1112 assert(w->type == WATCH_FD);
1113 assert(w->data.unit == u);
1114 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1117 w->type = WATCH_INVALID;
1118 w->data.unit = NULL;
1121 int unit_watch_pid(Unit *u, pid_t pid) {
1125 /* Watch a specific PID. We only support one unit watching
1126 * each PID for now. */
1128 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1131 void unit_unwatch_pid(Unit *u, pid_t pid) {
1135 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1138 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1139 struct itimerspec its;
1145 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1147 /* This will try to reuse the old timer if there is one */
1149 if (w->type == WATCH_TIMER) {
1154 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1161 /* Set absolute time in the past, but not 0, since we
1162 * don't want to disarm the timer */
1163 its.it_value.tv_sec = 0;
1164 its.it_value.tv_nsec = 1;
1166 flags = TFD_TIMER_ABSTIME;
1168 timespec_store(&its.it_value, delay);
1172 /* This will also flush the elapse counter */
1173 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1176 if (w->type == WATCH_INVALID) {
1177 struct epoll_event ev;
1181 ev.events = EPOLLIN;
1183 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1188 w->type = WATCH_TIMER;
1195 close_nointr_nofail(fd);
1200 void unit_unwatch_timer(Unit *u, Watch *w) {
1204 if (w->type == WATCH_INVALID)
1207 assert(w->type == WATCH_TIMER && w->data.unit == u);
1209 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1210 close_nointr_nofail(w->fd);
1213 w->type = WATCH_INVALID;
1214 w->data.unit = NULL;
1217 bool unit_job_is_applicable(Unit *u, JobType j) {
1219 assert(j >= 0 && j < _JOB_TYPE_MAX);
1223 case JOB_VERIFY_ACTIVE:
1229 case JOB_TRY_RESTART:
1230 return unit_can_start(u);
1233 return unit_can_reload(u);
1235 case JOB_RELOAD_OR_START:
1236 return unit_can_reload(u) && unit_can_start(u);
1239 assert_not_reached("Invalid job type");
1243 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1245 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1246 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1247 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1248 [UNIT_WANTS] = UNIT_WANTED_BY,
1249 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1250 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1251 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1252 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1253 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1254 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1255 [UNIT_BEFORE] = UNIT_AFTER,
1256 [UNIT_AFTER] = UNIT_BEFORE,
1257 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1258 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1260 int r, q = 0, v = 0, w = 0;
1263 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1264 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1267 /* We won't allow dependencies on ourselves. We will not
1268 * consider them an error however. */
1272 if (UNIT_VTABLE(u)->no_requires &&
1273 (d == UNIT_REQUIRES ||
1274 d == UNIT_REQUIRES_OVERRIDABLE ||
1275 d == UNIT_REQUISITE ||
1276 d == UNIT_REQUISITE_OVERRIDABLE)) {
1280 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0 ||
1281 (r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1285 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1286 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1289 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1292 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1297 if (add_reference) {
1298 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1303 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1307 unit_add_to_dbus_queue(u);
1312 set_remove(u->meta.dependencies[d], other);
1315 set_remove(other->meta.dependencies[inverse_table[d]], u);
1318 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1323 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1327 assert(name || path);
1330 name = file_name_from_path(path);
1332 if (!unit_name_is_template(name)) {
1337 if (u->meta.instance)
1338 s = unit_name_replace_instance(name, u->meta.instance);
1342 if (!(i = unit_name_to_prefix(u->meta.id)))
1345 s = unit_name_replace_instance(name, i);
1356 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1362 assert(name || path);
1364 if (!(name = resolve_template(u, name, path, &s)))
1367 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1370 r = unit_add_dependency(u, d, other, add_reference);
1377 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1383 assert(name || path);
1385 if (!(name = resolve_template(u, name, path, &s)))
1388 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1391 r = unit_add_dependency(other, d, u, add_reference);
1398 int set_unit_path(const char *p) {
1402 /* This is mostly for debug purposes */
1404 if (path_is_absolute(p)) {
1405 if (!(c = strdup(p)))
1408 if (!(cwd = get_current_dir_name()))
1411 r = asprintf(&c, "%s/%s", cwd, p);
1418 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1427 char *unit_dbus_path(Unit *u) {
1432 if (!(e = bus_path_escape(u->meta.id)))
1435 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1444 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1452 /* Ensure this hasn't been added yet */
1455 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1456 LIST_PREPEND(CGroupBonding, by_path, l, b);
1458 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1459 LIST_REMOVE(CGroupBonding, by_path, l, b);
1463 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1469 static char *default_cgroup_path(Unit *u) {
1475 if (u->meta.instance) {
1478 if (!(t = unit_name_template(u->meta.id)))
1481 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1484 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1486 return r < 0 ? NULL : p;
1489 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1491 char *controller = NULL, *path = NULL;
1492 CGroupBonding *b = NULL;
1498 /* Detect controller name */
1499 n = strcspn(name, ":");
1502 (name[n] == ':' && name[n+1] == 0)) {
1504 /* Only controller name, no path? */
1506 if (!(path = default_cgroup_path(u)))
1512 /* Controller name, and path. */
1515 if (!path_is_absolute(p))
1518 if (!(path = strdup(p)))
1523 controller = strndup(name, n);
1525 controller = strdup(u->meta.manager->cgroup_controller);
1532 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1537 if (!(b = new0(CGroupBonding, 1))) {
1542 b->controller = controller;
1545 b->clean_up = false;
1547 if ((r = unit_add_cgroup(u, b)) < 0)
1560 int unit_add_default_cgroup(Unit *u) {
1566 /* Adds in the default cgroup data, if it wasn't specified yet */
1568 if (unit_get_default_cgroup(u))
1571 if (!(b = new0(CGroupBonding, 1)))
1574 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1577 if (!(b->path = default_cgroup_path(u)))
1583 if ((r = unit_add_cgroup(u, b)) < 0)
1590 free(b->controller);
1596 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1599 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1602 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1610 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1613 assert(!unit_has_name(u, t));
1615 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1618 assert(r < 0 || *_found != u);
1623 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1631 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1634 assert(!unit_has_name(u, t));
1636 found = manager_get_unit(u->meta.manager, t);
1646 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1650 return unit_name_to_prefix_and_instance(u->meta.id);
1653 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1657 return unit_name_to_prefix(u->meta.id);
1660 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1666 if (!(p = unit_name_to_prefix(u->meta.id)))
1669 r = unit_name_unescape(p);
1675 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1679 if (u->meta.instance)
1680 return unit_name_unescape(u->meta.instance);
1685 char *unit_name_printf(Unit *u, const char* format) {
1688 * This will use the passed string as format string and
1689 * replace the following specifiers:
1691 * %n: the full id of the unit (foo@bar.waldo)
1692 * %N: the id of the unit without the suffix (foo@bar)
1693 * %p: the prefix (foo)
1694 * %i: the instance (bar)
1697 const Specifier table[] = {
1698 { 'n', specifier_string, u->meta.id },
1699 { 'N', specifier_prefix_and_instance, NULL },
1700 { 'p', specifier_prefix, NULL },
1701 { 'i', specifier_string, u->meta.instance },
1708 return specifier_printf(format, table, u);
1711 char *unit_full_printf(Unit *u, const char *format) {
1713 /* This is similar to unit_name_printf() but also supports
1716 const Specifier table[] = {
1717 { 'n', specifier_string, u->meta.id },
1718 { 'N', specifier_prefix_and_instance, NULL },
1719 { 'p', specifier_prefix, NULL },
1720 { 'P', specifier_prefix_unescaped, NULL },
1721 { 'i', specifier_string, u->meta.instance },
1722 { 'I', specifier_instance_unescaped, NULL },
1729 return specifier_printf(format, table, u);
1732 char **unit_full_printf_strv(Unit *u, char **l) {
1736 /* Applies unit_full_printf to every entry in l */
1741 if (!(r = new(char*, n+1)))
1744 for (i = l, j = r; *i; i++, j++)
1745 if (!(*j = unit_full_printf(u, *i)))
1761 int unit_watch_bus_name(Unit *u, const char *name) {
1765 /* Watch a specific name on the bus. We only support one unit
1766 * watching each name for now. */
1768 return hashmap_put(u->meta.manager->watch_bus, name, u);
1771 void unit_unwatch_bus_name(Unit *u, const char *name) {
1775 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1778 bool unit_can_serialize(Unit *u) {
1781 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1784 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1791 if (!unit_can_serialize(u))
1794 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1802 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1813 va_start(ap, format);
1814 vfprintf(f, format, ap);
1820 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1826 fprintf(f, "%s=%s\n", key, value);
1829 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1836 if (!unit_can_serialize(u))
1840 char line[1024], *l, *v;
1843 if (!fgets(line, sizeof(line), f)) {
1855 k = strcspn(l, "=");
1863 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1868 int unit_add_node_link(Unit *u, const char *what, bool wants) {
1878 /* Adds in links to the device node that this unit is based on */
1880 if (!is_device_path(what))
1883 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
1886 r = manager_load_unit(u->meta.manager, e, NULL, &device);
1892 if ((r = unit_add_dependency(u, UNIT_AFTER, device, true)) < 0)
1895 if ((r = unit_add_dependency(u, UNIT_REQUIRES, device, true)) < 0)
1899 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
1905 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1906 [UNIT_SERVICE] = "service",
1907 [UNIT_TIMER] = "timer",
1908 [UNIT_SOCKET] = "socket",
1909 [UNIT_TARGET] = "target",
1910 [UNIT_DEVICE] = "device",
1911 [UNIT_MOUNT] = "mount",
1912 [UNIT_AUTOMOUNT] = "automount",
1913 [UNIT_SNAPSHOT] = "snapshot",
1914 [UNIT_SWAP] = "swap"
1917 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1919 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1920 [UNIT_STUB] = "stub",
1921 [UNIT_LOADED] = "loaded",
1922 [UNIT_FAILED] = "failed",
1923 [UNIT_MERGED] = "merged"
1926 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1928 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1929 [UNIT_ACTIVE] = "active",
1930 [UNIT_INACTIVE] = "inactive",
1931 [UNIT_ACTIVATING] = "activating",
1932 [UNIT_DEACTIVATING] = "deactivating"
1935 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1937 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1938 [UNIT_REQUIRES] = "Requires",
1939 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1940 [UNIT_WANTS] = "Wants",
1941 [UNIT_REQUISITE] = "Requisite",
1942 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1943 [UNIT_REQUIRED_BY] = "RequiredBy",
1944 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1945 [UNIT_WANTED_BY] = "WantedBy",
1946 [UNIT_CONFLICTS] = "Conflicts",
1947 [UNIT_BEFORE] = "Before",
1948 [UNIT_AFTER] = "After",
1949 [UNIT_REFERENCES] = "References",
1950 [UNIT_REFERENCED_BY] = "ReferencedBy"
1953 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1955 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1956 [KILL_CONTROL_GROUP] = "control-group",
1957 [KILL_PROCESS_GROUP] = "process-group",
1958 [KILL_PROCESS] = "process",
1959 [KILL_NONE] = "none"
1962 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);