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
53 Unit *unit_new(Manager *m) {
58 if (!(u = new0(Unit, 1)))
61 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
67 u->meta.type = _UNIT_TYPE_INVALID;
72 bool unit_has_name(Unit *u, const char *name) {
76 return !!set_get(u->meta.names, (char*) name);
79 int unit_add_name(Unit *u, const char *text) {
81 char *s = NULL, *i = NULL;
87 if (unit_name_is_template(text)) {
88 if (!u->meta.instance)
91 s = unit_name_replace_instance(text, u->meta.instance);
98 if (!unit_name_is_valid(s)) {
103 assert_se((t = unit_name_to_type(s)) >= 0);
105 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
110 if ((r = unit_name_to_instance(s, &i)) < 0)
113 if (i && unit_vtable[t]->no_instances)
116 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
121 if (unit_vtable[t]->no_alias &&
122 !set_isempty(u->meta.names) &&
123 !set_get(u->meta.names, s)) {
128 if ((r = set_put(u->meta.names, s)) < 0) {
134 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
135 set_remove(u->meta.names, s);
139 if (u->meta.type == _UNIT_TYPE_INVALID) {
143 u->meta.instance = i;
145 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
147 if (UNIT_VTABLE(u)->init)
148 UNIT_VTABLE(u)->init(u);
152 unit_add_to_dbus_queue(u);
162 int unit_choose_id(Unit *u, const char *name) {
168 if (unit_name_is_template(name)) {
170 if (!u->meta.instance)
173 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
179 /* Selects one of the names of this unit as the id */
180 s = set_get(u->meta.names, (char*) name);
187 unit_add_to_dbus_queue(u);
192 int unit_set_description(Unit *u, const char *description) {
197 if (!(s = strdup(description)))
200 free(u->meta.description);
201 u->meta.description = s;
203 unit_add_to_dbus_queue(u);
207 void unit_add_to_load_queue(Unit *u) {
209 assert(u->meta.type != _UNIT_TYPE_INVALID);
211 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
214 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
215 u->meta.in_load_queue = true;
218 void unit_add_to_cleanup_queue(Unit *u) {
221 if (u->meta.in_cleanup_queue)
224 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
225 u->meta.in_cleanup_queue = true;
228 void unit_add_to_dbus_queue(Unit *u) {
230 assert(u->meta.type != _UNIT_TYPE_INVALID);
232 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
235 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
236 u->meta.in_dbus_queue = true;
239 static void bidi_set_free(Unit *u, Set *s) {
245 /* Frees the set and makes sure we are dropped from the
246 * inverse pointers */
248 SET_FOREACH(other, s, i) {
251 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
252 set_remove(other->meta.dependencies[d], u);
258 void unit_free(Unit *u) {
265 bus_unit_send_removed_signal(u);
267 /* Detach from next 'bigger' objects */
268 SET_FOREACH(t, u->meta.names, i)
269 hashmap_remove_value(u->meta.manager->units, t, u);
271 if (u->meta.type != _UNIT_TYPE_INVALID)
272 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
274 if (u->meta.in_load_queue)
275 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
277 if (u->meta.in_dbus_queue)
278 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
280 if (u->meta.in_cleanup_queue)
281 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
283 /* Free data and next 'smaller' objects */
285 job_free(u->meta.job);
287 if (u->meta.load_state != UNIT_STUB)
288 if (UNIT_VTABLE(u)->done)
289 UNIT_VTABLE(u)->done(u);
291 cgroup_bonding_free_list(u->meta.cgroup_bondings);
293 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
294 bidi_set_free(u, u->meta.dependencies[d]);
296 free(u->meta.description);
297 free(u->meta.fragment_path);
299 while ((t = set_steal_first(u->meta.names)))
301 set_free(u->meta.names);
303 free(u->meta.instance);
308 UnitActiveState unit_active_state(Unit *u) {
311 if (u->meta.load_state != UNIT_LOADED)
312 return UNIT_INACTIVE;
314 return UNIT_VTABLE(u)->active_state(u);
317 const char* unit_sub_state_to_string(Unit *u) {
320 return UNIT_VTABLE(u)->sub_state_to_string(u);
323 static void complete_move(Set **s, Set **other) {
331 set_move(*s, *other);
338 static void merge_names(Unit *u, Unit *other) {
345 complete_move(&u->meta.names, &other->meta.names);
347 while ((t = set_steal_first(other->meta.names)))
350 set_free(other->meta.names);
351 other->meta.names = NULL;
352 other->meta.id = NULL;
354 SET_FOREACH(t, u->meta.names, i)
355 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
358 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
365 assert(d < _UNIT_DEPENDENCY_MAX);
367 SET_FOREACH(back, other->meta.dependencies[d], i) {
370 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
371 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
374 set_remove(back->meta.dependencies[k], other);
376 assert(r == -ENOENT);
380 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
382 set_free(other->meta.dependencies[d]);
383 other->meta.dependencies[d] = NULL;
386 int unit_merge(Unit *u, Unit *other) {
391 assert(u->meta.manager == other->meta.manager);
392 assert(u->meta.type != _UNIT_TYPE_INVALID);
394 other = unit_follow_merge(other);
399 if (u->meta.type != other->meta.type)
402 if (!streq_ptr(u->meta.instance, other->meta.instance))
405 if (other->meta.load_state != UNIT_STUB &&
406 other->meta.load_state != UNIT_FAILED)
412 if (unit_active_state(other) != UNIT_INACTIVE)
416 merge_names(u, other);
418 /* Merge dependencies */
419 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
420 merge_dependencies(u, other, d);
422 other->meta.load_state = UNIT_MERGED;
423 other->meta.merged_into = u;
425 /* If there is still some data attached to the other node, we
426 * don't need it anymore, and can free it. */
427 if (other->meta.load_state != UNIT_STUB)
428 if (UNIT_VTABLE(other)->done)
429 UNIT_VTABLE(other)->done(other);
431 unit_add_to_dbus_queue(u);
432 unit_add_to_cleanup_queue(other);
437 int unit_merge_by_name(Unit *u, const char *name) {
445 if (unit_name_is_template(name)) {
446 if (!u->meta.instance)
449 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
455 if (!(other = manager_get_unit(u->meta.manager, name)))
456 r = unit_add_name(u, name);
458 r = unit_merge(u, other);
464 Unit* unit_follow_merge(Unit *u) {
467 while (u->meta.load_state == UNIT_MERGED)
468 assert_se(u = u->meta.merged_into);
473 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
479 if (c->std_output != EXEC_OUTPUT_KERNEL && c->std_output != EXEC_OUTPUT_SYSLOG)
482 /* If syslog or kernel logging is requested, make sure our own
483 * logging daemon is run first. */
485 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL)) < 0)
488 if (u->meta.manager->running_as != MANAGER_SESSION)
489 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL)) < 0)
495 const char *unit_description(Unit *u) {
498 if (u->meta.description)
499 return u->meta.description;
504 void unit_dump(Unit *u, FILE *f, const char *prefix) {
511 char timestamp1[FORMAT_TIMESTAMP_MAX], timestamp2[FORMAT_TIMESTAMP_MAX];
514 assert(u->meta.type >= 0);
518 p2 = strappend(prefix, "\t");
519 prefix2 = p2 ? p2 : prefix;
523 "%s\tDescription: %s\n"
525 "%s\tUnit Load State: %s\n"
526 "%s\tUnit Active State: %s\n"
527 "%s\tActive Enter Timestamp: %s\n"
528 "%s\tActive Exit Timestamp: %s\n",
530 prefix, unit_description(u),
531 prefix, strna(u->meta.instance),
532 prefix, unit_load_state_to_string(u->meta.load_state),
533 prefix, unit_active_state_to_string(unit_active_state(u)),
534 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.active_enter_timestamp)),
535 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_exit_timestamp)));
537 SET_FOREACH(t, u->meta.names, i)
538 fprintf(f, "%s\tName: %s\n", prefix, t);
540 if (u->meta.fragment_path)
541 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
543 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
546 SET_FOREACH(other, u->meta.dependencies[d], i)
547 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
550 if (u->meta.load_state == UNIT_LOADED) {
552 "%s\tRecursive Stop: %s\n"
553 "%s\tStop When Unneeded: %s\n",
554 prefix, yes_no(u->meta.recursive_stop),
555 prefix, yes_no(u->meta.stop_when_unneeded));
557 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
558 fprintf(f, "%s\tControlGroup: %s:%s\n",
559 prefix, b->controller, b->path);
561 if (UNIT_VTABLE(u)->dump)
562 UNIT_VTABLE(u)->dump(u, f, prefix2);
564 } else if (u->meta.load_state == UNIT_MERGED)
566 "%s\tMerged into: %s\n",
567 prefix, u->meta.merged_into->meta.id);
570 job_dump(u->meta.job, f, prefix2);
575 /* Common implementation for multiple backends */
576 int unit_load_fragment_and_dropin(Unit *u) {
581 /* Load a .service file */
582 if ((r = unit_load_fragment(u)) < 0)
585 if (u->meta.load_state == UNIT_STUB)
588 /* Load drop-in directory data */
589 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
595 /* Common implementation for multiple backends */
596 int unit_load_fragment_and_dropin_optional(Unit *u) {
601 /* Same as unit_load_fragment_and_dropin(), but whether
602 * something can be loaded or not doesn't matter. */
604 /* Load a .service file */
605 if ((r = unit_load_fragment(u)) < 0)
608 if (u->meta.load_state == UNIT_STUB)
609 u->meta.load_state = UNIT_LOADED;
611 /* Load drop-in directory data */
612 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
618 int unit_load(Unit *u) {
623 if (u->meta.in_load_queue) {
624 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
625 u->meta.in_load_queue = false;
628 if (u->meta.type == _UNIT_TYPE_INVALID)
631 if (u->meta.load_state != UNIT_STUB)
634 if (UNIT_VTABLE(u)->load)
635 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
638 if (u->meta.load_state == UNIT_STUB) {
643 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
645 unit_add_to_dbus_queue(unit_follow_merge(u));
650 u->meta.load_state = UNIT_FAILED;
651 unit_add_to_dbus_queue(u);
653 log_error("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
659 * -EBADR: This unit type does not support starting.
660 * -EALREADY: Unit is already started.
661 * -EAGAIN: An operation is already in progress. Retry later.
663 int unit_start(Unit *u) {
664 UnitActiveState state;
668 /* If this is already (being) started, then this will
669 * succeed. Note that this will even succeed if this unit is
670 * not startable by the user. This is relied on to detect when
671 * we need to wait for units and when waiting is finished. */
672 state = unit_active_state(u);
673 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
676 /* If it is stopped, but we cannot start it, then fail */
677 if (!UNIT_VTABLE(u)->start)
680 /* We don't suppress calls to ->start() here when we are
681 * already starting, to allow this request to be used as a
682 * "hurry up" call, for example when the unit is in some "auto
683 * restart" state where it waits for a holdoff timer to elapse
684 * before it will start again. */
686 unit_add_to_dbus_queue(u);
687 return UNIT_VTABLE(u)->start(u);
690 bool unit_can_start(Unit *u) {
693 return !!UNIT_VTABLE(u)->start;
697 * -EBADR: This unit type does not support stopping.
698 * -EALREADY: Unit is already stopped.
699 * -EAGAIN: An operation is already in progress. Retry later.
701 int unit_stop(Unit *u) {
702 UnitActiveState state;
706 state = unit_active_state(u);
707 if (state == UNIT_INACTIVE)
710 if (!UNIT_VTABLE(u)->stop)
713 unit_add_to_dbus_queue(u);
714 return UNIT_VTABLE(u)->stop(u);
718 * -EBADR: This unit type does not support reloading.
719 * -ENOEXEC: Unit is not started.
720 * -EAGAIN: An operation is already in progress. Retry later.
722 int unit_reload(Unit *u) {
723 UnitActiveState state;
727 if (!unit_can_reload(u))
730 state = unit_active_state(u);
731 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
734 if (unit_active_state(u) != UNIT_ACTIVE)
737 unit_add_to_dbus_queue(u);
738 return UNIT_VTABLE(u)->reload(u);
741 bool unit_can_reload(Unit *u) {
744 if (!UNIT_VTABLE(u)->reload)
747 if (!UNIT_VTABLE(u)->can_reload)
750 return UNIT_VTABLE(u)->can_reload(u);
753 static void unit_check_uneeded(Unit *u) {
759 /* If this service shall be shut down when unneeded then do
762 if (!u->meta.stop_when_unneeded)
765 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
768 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
769 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
772 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
773 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
776 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
777 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
780 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
782 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
783 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
786 static void retroactively_start_dependencies(Unit *u) {
791 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
793 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
794 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
795 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
797 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
798 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
799 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
801 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
802 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
803 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
805 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
806 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
807 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
809 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
810 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
811 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
814 static void retroactively_stop_dependencies(Unit *u) {
819 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
821 if (u->meta.recursive_stop) {
822 /* Pull down units need us recursively if enabled */
823 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
824 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
825 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
828 /* Garbage collect services that might not be needed anymore, if enabled */
829 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
830 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
831 unit_check_uneeded(other);
832 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
833 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
834 unit_check_uneeded(other);
835 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
836 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
837 unit_check_uneeded(other);
838 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
839 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
840 unit_check_uneeded(other);
841 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
842 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
843 unit_check_uneeded(other);
846 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
847 bool unexpected = false;
850 assert(os < _UNIT_ACTIVE_STATE_MAX);
851 assert(ns < _UNIT_ACTIVE_STATE_MAX);
853 /* Note that this is called for all low-level state changes,
854 * even if they might map to the same high-level
855 * UnitActiveState! That means that ns == os is OK an expected
856 * behaviour here. For example: if a mount point is remounted
857 * this function will be called too and the utmp code below
860 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
861 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
862 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
863 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
867 if (u->meta.job->state == JOB_WAITING)
869 /* So we reached a different state for this
870 * job. Let's see if we can run it now if it
871 * failed previously due to EAGAIN. */
872 job_add_to_run_queue(u->meta.job);
875 assert(u->meta.job->state == JOB_RUNNING);
877 /* Let's check whether this state change
878 * constitutes a finished job, or maybe
879 * cotradicts a running job and hence needs to
880 * invalidate jobs. */
882 switch (u->meta.job->type) {
885 case JOB_VERIFY_ACTIVE:
887 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
888 job_finish_and_invalidate(u->meta.job, true);
889 else if (ns != UNIT_ACTIVATING) {
891 job_finish_and_invalidate(u->meta.job, false);
897 case JOB_RELOAD_OR_START:
899 if (ns == UNIT_ACTIVE)
900 job_finish_and_invalidate(u->meta.job, true);
901 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
903 job_finish_and_invalidate(u->meta.job, false);
910 case JOB_TRY_RESTART:
912 if (ns == UNIT_INACTIVE)
913 job_finish_and_invalidate(u->meta.job, true);
914 else if (ns != UNIT_DEACTIVATING) {
916 job_finish_and_invalidate(u->meta.job, false);
922 assert_not_reached("Job type unknown");
927 /* If this state change happened without being requested by a
928 * job, then let's retroactively start or stop dependencies */
931 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
932 retroactively_start_dependencies(u);
933 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
934 retroactively_stop_dependencies(u);
937 /* Some names are special */
938 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
939 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
940 /* The bus just might have become available,
941 * hence try to connect to it, if we aren't
943 bus_init_system(u->meta.manager);
944 bus_init_api(u->meta.manager);
947 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
948 /* The syslog daemon just might have become
949 * available, hence try to connect to it, if
950 * we aren't yet connected. */
953 if (u->meta.type == UNIT_MOUNT)
954 /* Another directory became available, let's
955 * check if that is enough to write our utmp
957 manager_write_utmp_reboot(u->meta.manager);
959 if (u->meta.type == UNIT_TARGET)
960 /* A target got activated, maybe this is a runlevel? */
961 manager_write_utmp_runlevel(u->meta.manager, u);
963 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
965 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
966 /* The syslog daemon might just have
967 * terminated, hence try to disconnect from
971 /* We don't care about D-Bus here, since we'll get an
972 * asynchronous notification for it anyway. */
975 /* Maybe we finished startup and are now ready for being
976 * stopped because unneeded? */
977 unit_check_uneeded(u);
979 unit_add_to_dbus_queue(u);
982 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
983 struct epoll_event ev;
988 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
994 if (epoll_ctl(u->meta.manager->epoll_fd,
995 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1007 void unit_unwatch_fd(Unit *u, Watch *w) {
1011 if (w->type == WATCH_INVALID)
1014 assert(w->type == WATCH_FD);
1015 assert(w->data.unit == u);
1016 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1019 w->type = WATCH_INVALID;
1020 w->data.unit = NULL;
1023 int unit_watch_pid(Unit *u, pid_t pid) {
1027 /* Watch a specific PID. We only support one unit watching
1028 * each PID for now. */
1030 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1033 void unit_unwatch_pid(Unit *u, pid_t pid) {
1037 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1040 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1041 struct itimerspec its;
1047 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1049 /* This will try to reuse the old timer if there is one */
1051 if (w->type == WATCH_TIMER) {
1056 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1063 /* Set absolute time in the past, but not 0, since we
1064 * don't want to disarm the timer */
1065 its.it_value.tv_sec = 0;
1066 its.it_value.tv_nsec = 1;
1068 flags = TFD_TIMER_ABSTIME;
1070 timespec_store(&its.it_value, delay);
1074 /* This will also flush the elapse counter */
1075 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1078 if (w->type == WATCH_INVALID) {
1079 struct epoll_event ev;
1083 ev.events = EPOLLIN;
1085 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1090 w->type = WATCH_TIMER;
1097 close_nointr_nofail(fd);
1102 void unit_unwatch_timer(Unit *u, Watch *w) {
1106 if (w->type == WATCH_INVALID)
1109 assert(w->type == WATCH_TIMER && w->data.unit == u);
1111 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1112 assert_se(close_nointr(w->fd) == 0);
1115 w->type = WATCH_INVALID;
1116 w->data.unit = NULL;
1119 bool unit_job_is_applicable(Unit *u, JobType j) {
1121 assert(j >= 0 && j < _JOB_TYPE_MAX);
1125 case JOB_VERIFY_ACTIVE:
1131 case JOB_TRY_RESTART:
1132 return unit_can_start(u);
1135 return unit_can_reload(u);
1137 case JOB_RELOAD_OR_START:
1138 return unit_can_reload(u) && unit_can_start(u);
1141 assert_not_reached("Invalid job type");
1145 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1147 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1148 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1149 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1150 [UNIT_WANTS] = UNIT_WANTED_BY,
1151 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1152 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1153 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1154 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1155 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1156 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1157 [UNIT_BEFORE] = UNIT_AFTER,
1158 [UNIT_AFTER] = UNIT_BEFORE
1163 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1164 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1167 /* We won't allow dependencies on ourselves. We will not
1168 * consider them an error however. */
1172 if (UNIT_VTABLE(u)->no_requires &&
1173 (d == UNIT_REQUIRES ||
1174 d == UNIT_REQUIRES_OVERRIDABLE ||
1175 d == UNIT_REQUISITE ||
1176 d == UNIT_REQUISITE_OVERRIDABLE)) {
1180 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1183 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1186 if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1189 if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1190 set_remove(u->meta.dependencies[d], other);
1194 unit_add_to_dbus_queue(u);
1198 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1202 assert(name || path);
1205 name = file_name_from_path(path);
1207 if (!unit_name_is_template(name)) {
1212 if (u->meta.instance)
1213 s = unit_name_replace_instance(name, u->meta.instance);
1217 if (!(i = unit_name_to_prefix(u->meta.id)))
1220 s = unit_name_replace_instance(name, i);
1231 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path) {
1237 assert(name || path);
1239 if (!(name = resolve_template(u, name, path, &s)))
1242 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1245 r = unit_add_dependency(u, d, other);
1252 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path) {
1258 assert(name || path);
1260 if (!(name = resolve_template(u, name, path, &s)))
1263 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1266 r = unit_add_dependency(other, d, u);
1273 int set_unit_path(const char *p) {
1277 /* This is mostly for debug purposes */
1279 if (path_is_absolute(p)) {
1280 if (!(c = strdup(p)))
1283 if (!(cwd = get_current_dir_name()))
1286 r = asprintf(&c, "%s/%s", cwd, p);
1293 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1302 char *unit_dbus_path(Unit *u) {
1307 if (!(e = bus_path_escape(u->meta.id)))
1310 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1319 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1327 /* Ensure this hasn't been added yet */
1330 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1331 LIST_PREPEND(CGroupBonding, by_path, l, b);
1333 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1334 LIST_REMOVE(CGroupBonding, by_path, l, b);
1338 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1344 static char *default_cgroup_path(Unit *u) {
1350 if (u->meta.instance) {
1353 if (!(t = unit_name_template(u->meta.id)))
1356 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1359 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1361 return r < 0 ? NULL : p;
1364 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1366 char *controller = NULL, *path = NULL;
1367 CGroupBonding *b = NULL;
1373 /* Detect controller name */
1374 n = strcspn(name, ":");
1377 (name[n] == ':' && name[n+1] == 0)) {
1379 /* Only controller name, no path? */
1381 if (!(path = default_cgroup_path(u)))
1387 /* Controller name, and path. */
1390 if (!path_is_absolute(p))
1393 if (!(path = strdup(p)))
1398 controller = strndup(name, n);
1400 controller = strdup(u->meta.manager->cgroup_controller);
1407 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1412 if (!(b = new0(CGroupBonding, 1))) {
1417 b->controller = controller;
1420 b->clean_up = false;
1422 if ((r = unit_add_cgroup(u, b)) < 0)
1435 int unit_add_default_cgroup(Unit *u) {
1441 /* Adds in the default cgroup data, if it wasn't specified yet */
1443 if (unit_get_default_cgroup(u))
1446 if (!(b = new0(CGroupBonding, 1)))
1449 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1452 if (!(b->path = default_cgroup_path(u)))
1458 if ((r = unit_add_cgroup(u, b)) < 0)
1465 free(b->controller);
1471 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1474 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1477 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1485 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1488 assert(!unit_has_name(u, t));
1490 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1493 assert(r < 0 || *_found != u);
1498 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1502 return unit_name_to_prefix_and_instance(u->meta.id);
1505 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1509 return unit_name_to_prefix(u->meta.id);
1512 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1518 if (!(p = unit_name_to_prefix(u->meta.id)))
1521 r = unit_name_unescape(p);
1527 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1531 if (u->meta.instance)
1532 return unit_name_unescape(u->meta.instance);
1537 char *unit_name_printf(Unit *u, const char* format) {
1540 * This will use the passed string as format string and
1541 * replace the following specifiers:
1543 * %n: the full id of the unit (foo@bar.waldo)
1544 * %N: the id of the unit without the suffix (foo@bar)
1545 * %p: the prefix (foo)
1546 * %i: the instance (bar)
1549 const Specifier table[] = {
1550 { 'n', specifier_string, u->meta.id },
1551 { 'N', specifier_prefix_and_instance, NULL },
1552 { 'p', specifier_prefix, NULL },
1553 { 'i', specifier_string, u->meta.instance },
1560 return specifier_printf(format, table, u);
1563 char *unit_full_printf(Unit *u, const char *format) {
1565 /* This is similar to unit_name_printf() but also supports
1568 const Specifier table[] = {
1569 { 'n', specifier_string, u->meta.id },
1570 { 'N', specifier_prefix_and_instance, NULL },
1571 { 'p', specifier_prefix, NULL },
1572 { 'P', specifier_prefix_unescaped, NULL },
1573 { 'i', specifier_string, u->meta.instance },
1574 { 'I', specifier_instance_unescaped, NULL },
1581 return specifier_printf(format, table, u);
1584 char **unit_full_printf_strv(Unit *u, char **l) {
1588 /* Applies unit_full_printf to every entry in l */
1593 if (!(r = new(char*, n+1)))
1596 for (i = l, j = r; *i; i++, j++)
1597 if (!(*j = unit_full_printf(u, *i)))
1613 int unit_watch_bus_name(Unit *u, const char *name) {
1617 /* Watch a specific name on the bus. We only support one unit
1618 * watching each name for now. */
1620 return hashmap_put(u->meta.manager->watch_bus, name, u);
1623 void unit_unwatch_bus_name(Unit *u, const char *name) {
1627 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1630 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1631 [UNIT_SERVICE] = "service",
1632 [UNIT_TIMER] = "timer",
1633 [UNIT_SOCKET] = "socket",
1634 [UNIT_TARGET] = "target",
1635 [UNIT_DEVICE] = "device",
1636 [UNIT_MOUNT] = "mount",
1637 [UNIT_AUTOMOUNT] = "automount",
1638 [UNIT_SNAPSHOT] = "snapshot"
1641 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1643 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1644 [UNIT_STUB] = "stub",
1645 [UNIT_LOADED] = "loaded",
1646 [UNIT_FAILED] = "failed",
1647 [UNIT_MERGED] = "merged"
1650 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1652 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1653 [UNIT_ACTIVE] = "active",
1654 [UNIT_INACTIVE] = "inactive",
1655 [UNIT_ACTIVATING] = "activating",
1656 [UNIT_DEACTIVATING] = "deactivating"
1659 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1661 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1662 [UNIT_REQUIRES] = "Requires",
1663 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1664 [UNIT_WANTS] = "Wants",
1665 [UNIT_REQUISITE] = "Requisite",
1666 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1667 [UNIT_REQUIRED_BY] = "RequiredBy",
1668 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1669 [UNIT_WANTED_BY] = "WantedBy",
1670 [UNIT_CONFLICTS] = "Conflicts",
1671 [UNIT_BEFORE] = "Before",
1672 [UNIT_AFTER] = "After",
1675 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1677 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1678 [KILL_CONTROL_GROUP] = "control-group",
1679 [KILL_PROCESS_GROUP] = "process-group",
1680 [KILL_PROCESS] = "process",
1681 [KILL_NONE] = "none"
1684 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);