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"
41 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
42 [UNIT_SERVICE] = &service_vtable,
43 [UNIT_TIMER] = &timer_vtable,
44 [UNIT_SOCKET] = &socket_vtable,
45 [UNIT_TARGET] = &target_vtable,
46 [UNIT_DEVICE] = &device_vtable,
47 [UNIT_MOUNT] = &mount_vtable,
48 [UNIT_AUTOMOUNT] = &automount_vtable,
49 [UNIT_SNAPSHOT] = &snapshot_vtable
52 Unit *unit_new(Manager *m) {
57 if (!(u = new0(Unit, 1)))
60 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
66 u->meta.type = _UNIT_TYPE_INVALID;
71 bool unit_has_name(Unit *u, const char *name) {
75 return !!set_get(u->meta.names, (char*) name);
78 int unit_add_name(Unit *u, const char *text) {
80 char *s = NULL, *i = NULL;
86 if (unit_name_is_template(text)) {
87 if (!u->meta.instance)
90 s = unit_name_replace_instance(text, u->meta.instance);
97 if (!unit_name_is_valid(s)) {
102 assert_se((t = unit_name_to_type(s)) >= 0);
104 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
109 if ((r = unit_name_to_instance(s, &i)) < 0)
112 if (i && unit_vtable[t]->no_instances)
115 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
120 if (unit_vtable[t]->no_alias &&
121 !set_isempty(u->meta.names) &&
122 !set_get(u->meta.names, s)) {
127 if ((r = set_put(u->meta.names, s)) < 0) {
133 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
134 set_remove(u->meta.names, s);
138 if (u->meta.type == _UNIT_TYPE_INVALID) {
142 u->meta.instance = i;
144 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
146 if (UNIT_VTABLE(u)->init)
147 UNIT_VTABLE(u)->init(u);
151 unit_add_to_dbus_queue(u);
161 int unit_choose_id(Unit *u, const char *name) {
167 if (unit_name_is_template(name)) {
169 if (!u->meta.instance)
172 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
178 /* Selects one of the names of this unit as the id */
179 s = set_get(u->meta.names, (char*) name);
186 unit_add_to_dbus_queue(u);
191 int unit_set_description(Unit *u, const char *description) {
196 if (!(s = strdup(description)))
199 free(u->meta.description);
200 u->meta.description = s;
202 unit_add_to_dbus_queue(u);
206 void unit_add_to_load_queue(Unit *u) {
208 assert(u->meta.type != _UNIT_TYPE_INVALID);
210 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
213 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
214 u->meta.in_load_queue = true;
217 void unit_add_to_cleanup_queue(Unit *u) {
220 if (u->meta.in_cleanup_queue)
223 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
224 u->meta.in_cleanup_queue = true;
227 void unit_add_to_dbus_queue(Unit *u) {
229 assert(u->meta.type != _UNIT_TYPE_INVALID);
231 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
234 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
235 u->meta.in_dbus_queue = true;
238 static void bidi_set_free(Unit *u, Set *s) {
244 /* Frees the set and makes sure we are dropped from the
245 * inverse pointers */
247 SET_FOREACH(other, s, i) {
250 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
251 set_remove(other->meta.dependencies[d], u);
257 void unit_free(Unit *u) {
264 bus_unit_send_removed_signal(u);
266 /* Detach from next 'bigger' objects */
267 SET_FOREACH(t, u->meta.names, i)
268 hashmap_remove_value(u->meta.manager->units, t, u);
270 if (u->meta.type != _UNIT_TYPE_INVALID)
271 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
273 if (u->meta.in_load_queue)
274 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
276 if (u->meta.in_dbus_queue)
277 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
279 if (u->meta.in_cleanup_queue)
280 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
282 /* Free data and next 'smaller' objects */
284 job_free(u->meta.job);
286 if (u->meta.load_state != UNIT_STUB)
287 if (UNIT_VTABLE(u)->done)
288 UNIT_VTABLE(u)->done(u);
290 cgroup_bonding_free_list(u->meta.cgroup_bondings);
292 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
293 bidi_set_free(u, u->meta.dependencies[d]);
295 free(u->meta.description);
296 free(u->meta.fragment_path);
298 while ((t = set_steal_first(u->meta.names)))
300 set_free(u->meta.names);
302 free(u->meta.instance);
307 UnitActiveState unit_active_state(Unit *u) {
310 if (u->meta.load_state != UNIT_LOADED)
311 return UNIT_INACTIVE;
313 return UNIT_VTABLE(u)->active_state(u);
316 const char* unit_sub_state_to_string(Unit *u) {
319 return UNIT_VTABLE(u)->sub_state_to_string(u);
322 static void complete_move(Set **s, Set **other) {
330 set_move(*s, *other);
337 static void merge_names(Unit *u, Unit *other) {
344 complete_move(&u->meta.names, &other->meta.names);
346 while ((t = set_steal_first(other->meta.names)))
349 set_free(other->meta.names);
350 other->meta.names = NULL;
351 other->meta.id = NULL;
353 SET_FOREACH(t, u->meta.names, i)
354 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
357 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
364 assert(d < _UNIT_DEPENDENCY_MAX);
366 SET_FOREACH(back, other->meta.dependencies[d], i) {
369 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
370 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
373 set_remove(back->meta.dependencies[k], other);
375 assert(r == -ENOENT);
379 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
381 set_free(other->meta.dependencies[d]);
382 other->meta.dependencies[d] = NULL;
385 int unit_merge(Unit *u, Unit *other) {
390 assert(u->meta.manager == other->meta.manager);
391 assert(u->meta.type != _UNIT_TYPE_INVALID);
393 other = unit_follow_merge(other);
398 if (u->meta.type != other->meta.type)
401 if (!streq_ptr(u->meta.instance, other->meta.instance))
404 if (other->meta.load_state != UNIT_STUB &&
405 other->meta.load_state != UNIT_FAILED)
411 if (unit_active_state(other) != UNIT_INACTIVE)
415 merge_names(u, other);
417 /* Merge dependencies */
418 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
419 merge_dependencies(u, other, d);
421 other->meta.load_state = UNIT_MERGED;
422 other->meta.merged_into = u;
424 /* If there is still some data attached to the other node, we
425 * don't need it anymore, and can free it. */
426 if (other->meta.load_state != UNIT_STUB)
427 if (UNIT_VTABLE(other)->done)
428 UNIT_VTABLE(other)->done(other);
430 unit_add_to_dbus_queue(u);
431 unit_add_to_cleanup_queue(other);
436 int unit_merge_by_name(Unit *u, const char *name) {
444 if (unit_name_is_template(name)) {
445 if (!u->meta.instance)
448 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
454 if (!(other = manager_get_unit(u->meta.manager, name)))
455 r = unit_add_name(u, name);
457 r = unit_merge(u, other);
463 Unit* unit_follow_merge(Unit *u) {
466 while (u->meta.load_state == UNIT_MERGED)
467 assert_se(u = u->meta.merged_into);
472 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
478 if (c->std_output != EXEC_OUTPUT_KERNEL && c->std_output != EXEC_OUTPUT_SYSLOG)
481 /* If syslog or kernel logging is requested, make sure our own
482 * logging daemon is run first. */
484 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL)) < 0)
487 if (u->meta.manager->running_as != MANAGER_SESSION)
488 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL)) < 0)
494 const char *unit_description(Unit *u) {
497 if (u->meta.description)
498 return u->meta.description;
503 void unit_dump(Unit *u, FILE *f, const char *prefix) {
510 char timestamp1[FORMAT_TIMESTAMP_MAX], timestamp2[FORMAT_TIMESTAMP_MAX];
513 assert(u->meta.type >= 0);
517 p2 = strappend(prefix, "\t");
518 prefix2 = p2 ? p2 : prefix;
522 "%s\tDescription: %s\n"
524 "%s\tUnit Load State: %s\n"
525 "%s\tUnit Active State: %s\n"
526 "%s\tActive Enter Timestamp: %s\n"
527 "%s\tActive Exit Timestamp: %s\n",
529 prefix, unit_description(u),
530 prefix, strna(u->meta.instance),
531 prefix, unit_load_state_to_string(u->meta.load_state),
532 prefix, unit_active_state_to_string(unit_active_state(u)),
533 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.active_enter_timestamp)),
534 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_exit_timestamp)));
536 SET_FOREACH(t, u->meta.names, i)
537 fprintf(f, "%s\tName: %s\n", prefix, t);
539 if (u->meta.fragment_path)
540 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
542 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
545 SET_FOREACH(other, u->meta.dependencies[d], i)
546 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
549 if (u->meta.load_state == UNIT_LOADED) {
551 "%s\tRecursive Stop: %s\n"
552 "%s\tStop When Unneeded: %s\n",
553 prefix, yes_no(u->meta.recursive_stop),
554 prefix, yes_no(u->meta.stop_when_unneeded));
556 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
557 fprintf(f, "%s\tControlGroup: %s:%s\n",
558 prefix, b->controller, b->path);
560 if (UNIT_VTABLE(u)->dump)
561 UNIT_VTABLE(u)->dump(u, f, prefix2);
563 } else if (u->meta.load_state == UNIT_MERGED)
565 "%s\tMerged into: %s\n",
566 prefix, u->meta.merged_into->meta.id);
569 job_dump(u->meta.job, f, prefix2);
574 /* Common implementation for multiple backends */
575 int unit_load_fragment_and_dropin(Unit *u) {
580 /* Load a .service file */
581 if ((r = unit_load_fragment(u)) < 0)
584 if (u->meta.load_state == UNIT_STUB)
587 /* Load drop-in directory data */
588 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
594 /* Common implementation for multiple backends */
595 int unit_load_fragment_and_dropin_optional(Unit *u) {
600 /* Same as unit_load_fragment_and_dropin(), but whether
601 * something can be loaded or not doesn't matter. */
603 /* Load a .service file */
604 if ((r = unit_load_fragment(u)) < 0)
607 if (u->meta.load_state == UNIT_STUB)
608 u->meta.load_state = UNIT_LOADED;
610 /* Load drop-in directory data */
611 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
617 int unit_load(Unit *u) {
622 if (u->meta.in_load_queue) {
623 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
624 u->meta.in_load_queue = false;
627 if (u->meta.type == _UNIT_TYPE_INVALID)
630 if (u->meta.load_state != UNIT_STUB)
633 if (UNIT_VTABLE(u)->load)
634 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
637 if (u->meta.load_state == UNIT_STUB) {
642 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
644 unit_add_to_dbus_queue(unit_follow_merge(u));
649 u->meta.load_state = UNIT_FAILED;
650 unit_add_to_dbus_queue(u);
652 log_error("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
658 * -EBADR: This unit type does not support starting.
659 * -EALREADY: Unit is already started.
660 * -EAGAIN: An operation is already in progress. Retry later.
662 int unit_start(Unit *u) {
663 UnitActiveState state;
667 /* If this is already (being) started, then this will
668 * succeed. Note that this will even succeed if this unit is
669 * not startable by the user. This is relied on to detect when
670 * we need to wait for units and when waiting is finished. */
671 state = unit_active_state(u);
672 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
675 /* If it is stopped, but we cannot start it, then fail */
676 if (!UNIT_VTABLE(u)->start)
679 /* We don't suppress calls to ->start() here when we are
680 * already starting, to allow this request to be used as a
681 * "hurry up" call, for example when the unit is in some "auto
682 * restart" state where it waits for a holdoff timer to elapse
683 * before it will start again. */
685 unit_add_to_dbus_queue(u);
686 return UNIT_VTABLE(u)->start(u);
689 bool unit_can_start(Unit *u) {
692 return !!UNIT_VTABLE(u)->start;
696 * -EBADR: This unit type does not support stopping.
697 * -EALREADY: Unit is already stopped.
698 * -EAGAIN: An operation is already in progress. Retry later.
700 int unit_stop(Unit *u) {
701 UnitActiveState state;
705 state = unit_active_state(u);
706 if (state == UNIT_INACTIVE)
709 if (!UNIT_VTABLE(u)->stop)
712 unit_add_to_dbus_queue(u);
713 return UNIT_VTABLE(u)->stop(u);
717 * -EBADR: This unit type does not support reloading.
718 * -ENOEXEC: Unit is not started.
719 * -EAGAIN: An operation is already in progress. Retry later.
721 int unit_reload(Unit *u) {
722 UnitActiveState state;
726 if (!unit_can_reload(u))
729 state = unit_active_state(u);
730 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
733 if (unit_active_state(u) != UNIT_ACTIVE)
736 unit_add_to_dbus_queue(u);
737 return UNIT_VTABLE(u)->reload(u);
740 bool unit_can_reload(Unit *u) {
743 if (!UNIT_VTABLE(u)->reload)
746 if (!UNIT_VTABLE(u)->can_reload)
749 return UNIT_VTABLE(u)->can_reload(u);
752 static void unit_check_uneeded(Unit *u) {
758 /* If this service shall be shut down when unneeded then do
761 if (!u->meta.stop_when_unneeded)
764 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
767 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
768 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
771 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
772 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
775 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
776 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
779 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
781 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
782 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
785 static void retroactively_start_dependencies(Unit *u) {
790 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
792 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
793 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
794 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
796 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
797 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
798 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
800 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
801 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
802 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
804 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
805 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
806 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
808 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
809 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
810 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
813 static void retroactively_stop_dependencies(Unit *u) {
818 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
820 if (u->meta.recursive_stop) {
821 /* Pull down units need us recursively if enabled */
822 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
823 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
824 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
827 /* Garbage collect services that might not be needed anymore, if enabled */
828 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
829 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
830 unit_check_uneeded(other);
831 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
832 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
833 unit_check_uneeded(other);
834 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
835 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
836 unit_check_uneeded(other);
837 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
838 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
839 unit_check_uneeded(other);
840 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
841 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
842 unit_check_uneeded(other);
845 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
846 bool unexpected = false;
849 assert(os < _UNIT_ACTIVE_STATE_MAX);
850 assert(ns < _UNIT_ACTIVE_STATE_MAX);
852 /* Note that this is called for all low-level state changes,
853 * even if they might map to the same high-level
854 * UnitActiveState! That means that ns == os is OK an expected
855 * behaviour here. For example: if a mount point is remounted
856 * this function will be called too and the utmp code below
859 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
860 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
861 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
862 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
866 if (u->meta.job->state == JOB_WAITING)
868 /* So we reached a different state for this
869 * job. Let's see if we can run it now if it
870 * failed previously due to EAGAIN. */
871 job_add_to_run_queue(u->meta.job);
874 assert(u->meta.job->state == JOB_RUNNING);
876 /* Let's check whether this state change
877 * constitutes a finished job, or maybe
878 * cotradicts a running job and hence needs to
879 * invalidate jobs. */
881 switch (u->meta.job->type) {
884 case JOB_VERIFY_ACTIVE:
886 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
887 job_finish_and_invalidate(u->meta.job, true);
888 else if (ns != UNIT_ACTIVATING) {
890 job_finish_and_invalidate(u->meta.job, false);
896 case JOB_RELOAD_OR_START:
898 if (ns == UNIT_ACTIVE)
899 job_finish_and_invalidate(u->meta.job, true);
900 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
902 job_finish_and_invalidate(u->meta.job, false);
909 case JOB_TRY_RESTART:
911 if (ns == UNIT_INACTIVE)
912 job_finish_and_invalidate(u->meta.job, true);
913 else if (ns != UNIT_DEACTIVATING) {
915 job_finish_and_invalidate(u->meta.job, false);
921 assert_not_reached("Job type unknown");
926 /* If this state change happened without being requested by a
927 * job, then let's retroactively start or stop dependencies */
930 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
931 retroactively_start_dependencies(u);
932 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
933 retroactively_stop_dependencies(u);
936 /* Some names are special */
937 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
938 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
939 /* The bus just might have become available,
940 * hence try to connect to it, if we aren't
942 bus_init_system(u->meta.manager);
943 bus_init_api(u->meta.manager);
946 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
947 /* The syslog daemon just might have become
948 * available, hence try to connect to it, if
949 * we aren't yet connected. */
952 if (u->meta.type == UNIT_MOUNT)
953 /* Another directory became available, let's
954 * check if that is enough to write our utmp
956 manager_write_utmp_reboot(u->meta.manager);
958 if (u->meta.type == UNIT_TARGET)
959 /* A target got activated, maybe this is a runlevel? */
960 manager_write_utmp_runlevel(u->meta.manager, u);
962 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
964 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
965 /* The syslog daemon might just have
966 * terminated, hence try to disconnect from
970 /* We don't care about D-Bus here, since we'll get an
971 * asynchronous notification for it anyway. */
974 /* Maybe we finished startup and are now ready for being
975 * stopped because unneeded? */
976 unit_check_uneeded(u);
978 unit_add_to_dbus_queue(u);
981 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
982 struct epoll_event ev;
987 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
993 if (epoll_ctl(u->meta.manager->epoll_fd,
994 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1006 void unit_unwatch_fd(Unit *u, Watch *w) {
1010 if (w->type == WATCH_INVALID)
1013 assert(w->type == WATCH_FD);
1014 assert(w->data.unit == u);
1015 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1018 w->type = WATCH_INVALID;
1019 w->data.unit = NULL;
1022 int unit_watch_pid(Unit *u, pid_t pid) {
1026 /* Watch a specific PID. We only support one unit watching
1027 * each PID for now. */
1029 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1032 void unit_unwatch_pid(Unit *u, pid_t pid) {
1036 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1039 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1040 struct itimerspec its;
1046 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1048 /* This will try to reuse the old timer if there is one */
1050 if (w->type == WATCH_TIMER) {
1055 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1062 /* Set absolute time in the past, but not 0, since we
1063 * don't want to disarm the timer */
1064 its.it_value.tv_sec = 0;
1065 its.it_value.tv_nsec = 1;
1067 flags = TFD_TIMER_ABSTIME;
1069 timespec_store(&its.it_value, delay);
1073 /* This will also flush the elapse counter */
1074 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1077 if (w->type == WATCH_INVALID) {
1078 struct epoll_event ev;
1082 ev.events = EPOLLIN;
1084 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1089 w->type = WATCH_TIMER;
1096 close_nointr_nofail(fd);
1101 void unit_unwatch_timer(Unit *u, Watch *w) {
1105 if (w->type == WATCH_INVALID)
1108 assert(w->type == WATCH_TIMER && w->data.unit == u);
1110 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1111 assert_se(close_nointr(w->fd) == 0);
1114 w->type = WATCH_INVALID;
1115 w->data.unit = NULL;
1118 bool unit_job_is_applicable(Unit *u, JobType j) {
1120 assert(j >= 0 && j < _JOB_TYPE_MAX);
1124 case JOB_VERIFY_ACTIVE:
1130 case JOB_TRY_RESTART:
1131 return unit_can_start(u);
1134 return unit_can_reload(u);
1136 case JOB_RELOAD_OR_START:
1137 return unit_can_reload(u) && unit_can_start(u);
1140 assert_not_reached("Invalid job type");
1144 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1146 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1147 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1148 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1149 [UNIT_WANTS] = UNIT_WANTED_BY,
1150 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1151 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1152 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1153 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1154 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1155 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1156 [UNIT_BEFORE] = UNIT_AFTER,
1157 [UNIT_AFTER] = UNIT_BEFORE
1162 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1163 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1166 /* We won't allow dependencies on ourselves. We will not
1167 * consider them an error however. */
1171 if (UNIT_VTABLE(u)->no_requires &&
1172 (d == UNIT_REQUIRES ||
1173 d == UNIT_REQUIRES_OVERRIDABLE ||
1174 d == UNIT_REQUISITE ||
1175 d == UNIT_REQUISITE_OVERRIDABLE)) {
1179 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1182 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1185 if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1188 if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1189 set_remove(u->meta.dependencies[d], other);
1193 unit_add_to_dbus_queue(u);
1197 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1201 assert(name || path);
1204 name = file_name_from_path(path);
1206 if (!unit_name_is_template(name)) {
1211 if (u->meta.instance)
1212 s = unit_name_replace_instance(name, u->meta.instance);
1216 if (!(i = unit_name_to_prefix(u->meta.id)))
1219 s = unit_name_replace_instance(name, i);
1230 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path) {
1236 assert(name || path);
1238 if (!(name = resolve_template(u, name, path, &s)))
1241 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1244 r = unit_add_dependency(u, d, other);
1251 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path) {
1257 assert(name || path);
1259 if (!(name = resolve_template(u, name, path, &s)))
1262 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1265 r = unit_add_dependency(other, d, u);
1272 int set_unit_path(const char *p) {
1276 /* This is mostly for debug purposes */
1278 if (path_is_absolute(p)) {
1279 if (!(c = strdup(p)))
1282 if (!(cwd = get_current_dir_name()))
1285 r = asprintf(&c, "%s/%s", cwd, p);
1292 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1301 char *unit_dbus_path(Unit *u) {
1306 if (!(e = bus_path_escape(u->meta.id)))
1309 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1318 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1326 /* Ensure this hasn't been added yet */
1329 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1330 LIST_PREPEND(CGroupBonding, by_path, l, b);
1332 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1333 LIST_REMOVE(CGroupBonding, by_path, l, b);
1337 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1343 static char *default_cgroup_path(Unit *u) {
1349 if (u->meta.instance) {
1352 if (!(t = unit_name_template(u->meta.id)))
1355 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1358 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1360 return r < 0 ? NULL : p;
1363 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1365 char *controller = NULL, *path = NULL;
1366 CGroupBonding *b = NULL;
1372 /* Detect controller name */
1373 n = strcspn(name, ":");
1376 (name[n] == ':' && name[n+1] == 0)) {
1378 /* Only controller name, no path? */
1380 if (!(path = default_cgroup_path(u)))
1386 /* Controller name, and path. */
1389 if (!path_is_absolute(p))
1392 if (!(path = strdup(p)))
1397 controller = strndup(name, n);
1399 controller = strdup(u->meta.manager->cgroup_controller);
1406 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1411 if (!(b = new0(CGroupBonding, 1))) {
1416 b->controller = controller;
1419 b->clean_up = false;
1421 if ((r = unit_add_cgroup(u, b)) < 0)
1434 int unit_add_default_cgroup(Unit *u) {
1440 /* Adds in the default cgroup data, if it wasn't specified yet */
1442 if (unit_get_default_cgroup(u))
1445 if (!(b = new0(CGroupBonding, 1)))
1448 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1451 if (!(b->path = default_cgroup_path(u)))
1457 if ((r = unit_add_cgroup(u, b)) < 0)
1464 free(b->controller);
1470 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1473 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1476 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1484 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1487 assert(!unit_has_name(u, t));
1489 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1492 assert(r < 0 || *_found != u);
1497 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1501 return unit_name_to_prefix_and_instance(u->meta.id);
1504 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1508 return unit_name_to_prefix(u->meta.id);
1511 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1517 if (!(p = unit_name_to_prefix(u->meta.id)))
1520 r = unit_name_unescape(p);
1526 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1530 if (u->meta.instance)
1531 return unit_name_unescape(u->meta.instance);
1536 char *unit_name_printf(Unit *u, const char* format) {
1539 * This will use the passed string as format string and
1540 * replace the following specifiers:
1542 * %n: the full id of the unit (foo@bar.waldo)
1543 * %N: the id of the unit without the suffix (foo@bar)
1544 * %p: the prefix (foo)
1545 * %i: the instance (bar)
1548 const Specifier table[] = {
1549 { 'n', specifier_string, u->meta.id },
1550 { 'N', specifier_prefix_and_instance, NULL },
1551 { 'p', specifier_prefix, NULL },
1552 { 'i', specifier_string, u->meta.instance },
1559 return specifier_printf(format, table, u);
1562 char *unit_full_printf(Unit *u, const char *format) {
1564 /* This is similar to unit_name_printf() but also supports
1567 const Specifier table[] = {
1568 { 'n', specifier_string, u->meta.id },
1569 { 'N', specifier_prefix_and_instance, NULL },
1570 { 'p', specifier_prefix, NULL },
1571 { 'P', specifier_prefix_unescaped, NULL },
1572 { 'i', specifier_string, u->meta.instance },
1573 { 'I', specifier_instance_unescaped, NULL },
1580 return specifier_printf(format, table, u);
1583 char **unit_full_printf_strv(Unit *u, char **l) {
1587 /* Applies unit_full_printf to every entry in l */
1592 if (!(r = new(char*, n+1)))
1595 for (i = l, j = r; *i; i++, j++)
1596 if (!(*j = unit_full_printf(u, *i)))
1612 int unit_watch_bus_name(Unit *u, const char *name) {
1616 /* Watch a specific name on the bus. We only support one unit
1617 * watching each name for now. */
1619 return hashmap_put(u->meta.manager->watch_bus, name, u);
1622 void unit_unwatch_bus_name(Unit *u, const char *name) {
1626 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1629 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1630 [UNIT_SERVICE] = "service",
1631 [UNIT_TIMER] = "timer",
1632 [UNIT_SOCKET] = "socket",
1633 [UNIT_TARGET] = "target",
1634 [UNIT_DEVICE] = "device",
1635 [UNIT_MOUNT] = "mount",
1636 [UNIT_AUTOMOUNT] = "automount",
1637 [UNIT_SNAPSHOT] = "snapshot"
1640 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1642 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1643 [UNIT_STUB] = "stub",
1644 [UNIT_LOADED] = "loaded",
1645 [UNIT_FAILED] = "failed",
1646 [UNIT_MERGED] = "merged"
1649 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1651 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1652 [UNIT_ACTIVE] = "active",
1653 [UNIT_INACTIVE] = "inactive",
1654 [UNIT_ACTIVATING] = "activating",
1655 [UNIT_DEACTIVATING] = "deactivating"
1658 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1660 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1661 [UNIT_REQUIRES] = "Requires",
1662 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1663 [UNIT_WANTS] = "Wants",
1664 [UNIT_REQUISITE] = "Requisite",
1665 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1666 [UNIT_REQUIRED_BY] = "RequiredBy",
1667 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1668 [UNIT_WANTED_BY] = "WantedBy",
1669 [UNIT_CONFLICTS] = "Conflicts",
1670 [UNIT_BEFORE] = "Before",
1671 [UNIT_AFTER] = "After",
1674 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1676 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1677 [KILL_CONTROL_GROUP] = "control-group",
1678 [KILL_PROCESS_GROUP] = "process-group",
1679 [KILL_PROCESS] = "process",
1680 [KILL_NONE] = "none"
1683 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);