1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/epoll.h>
26 #include <sys/timerfd.h>
35 #include "load-fragment.h"
36 #include "load-dropin.h"
38 #include "unit-name.h"
39 #include "specifier.h"
40 #include "dbus-unit.h"
42 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
43 [UNIT_SERVICE] = &service_vtable,
44 [UNIT_TIMER] = &timer_vtable,
45 [UNIT_SOCKET] = &socket_vtable,
46 [UNIT_TARGET] = &target_vtable,
47 [UNIT_DEVICE] = &device_vtable,
48 [UNIT_MOUNT] = &mount_vtable,
49 [UNIT_AUTOMOUNT] = &automount_vtable,
50 [UNIT_SNAPSHOT] = &snapshot_vtable,
51 [UNIT_SWAP] = &swap_vtable
54 Unit *unit_new(Manager *m) {
59 if (!(u = new0(Unit, 1)))
62 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
68 u->meta.type = _UNIT_TYPE_INVALID;
73 bool unit_has_name(Unit *u, const char *name) {
77 return !!set_get(u->meta.names, (char*) name);
80 int unit_add_name(Unit *u, const char *text) {
82 char *s = NULL, *i = NULL;
88 if (unit_name_is_template(text)) {
89 if (!u->meta.instance)
92 s = unit_name_replace_instance(text, u->meta.instance);
99 if (!unit_name_is_valid(s)) {
104 assert_se((t = unit_name_to_type(s)) >= 0);
106 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
111 if ((r = unit_name_to_instance(s, &i)) < 0)
114 if (i && unit_vtable[t]->no_instances)
117 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
122 if (unit_vtable[t]->no_alias &&
123 !set_isempty(u->meta.names) &&
124 !set_get(u->meta.names, s)) {
129 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
134 if ((r = set_put(u->meta.names, s)) < 0) {
140 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
141 set_remove(u->meta.names, s);
145 if (u->meta.type == _UNIT_TYPE_INVALID) {
149 u->meta.instance = i;
151 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
153 if (UNIT_VTABLE(u)->init)
154 UNIT_VTABLE(u)->init(u);
158 unit_add_to_dbus_queue(u);
168 int unit_choose_id(Unit *u, const char *name) {
174 if (unit_name_is_template(name)) {
176 if (!u->meta.instance)
179 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
185 /* Selects one of the names of this unit as the id */
186 s = set_get(u->meta.names, (char*) name);
193 unit_add_to_dbus_queue(u);
198 int unit_set_description(Unit *u, const char *description) {
203 if (!(s = strdup(description)))
206 free(u->meta.description);
207 u->meta.description = s;
209 unit_add_to_dbus_queue(u);
213 bool unit_check_gc(Unit *u) {
216 if (u->meta.load_state == UNIT_STUB)
219 if (UNIT_VTABLE(u)->no_gc)
225 if (unit_active_state(u) != UNIT_INACTIVE)
228 if (UNIT_VTABLE(u)->check_gc)
229 if (UNIT_VTABLE(u)->check_gc(u))
235 void unit_add_to_load_queue(Unit *u) {
237 assert(u->meta.type != _UNIT_TYPE_INVALID);
239 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
242 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
243 u->meta.in_load_queue = true;
246 void unit_add_to_cleanup_queue(Unit *u) {
249 if (u->meta.in_cleanup_queue)
252 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
253 u->meta.in_cleanup_queue = true;
256 void unit_add_to_gc_queue(Unit *u) {
259 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
262 if (unit_check_gc(u))
265 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
266 u->meta.in_gc_queue = true;
268 u->meta.manager->n_in_gc_queue ++;
270 if (u->meta.manager->gc_queue_timestamp <= 0)
271 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
274 void unit_add_to_dbus_queue(Unit *u) {
276 assert(u->meta.type != _UNIT_TYPE_INVALID);
278 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
281 if (set_isempty(u->meta.manager->subscribed)) {
282 u->meta.sent_dbus_new_signal = true;
286 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
287 u->meta.in_dbus_queue = true;
290 static void bidi_set_free(Unit *u, Set *s) {
296 /* Frees the set and makes sure we are dropped from the
297 * inverse pointers */
299 SET_FOREACH(other, s, i) {
302 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
303 set_remove(other->meta.dependencies[d], u);
305 unit_add_to_gc_queue(other);
311 void unit_free(Unit *u) {
318 bus_unit_send_removed_signal(u);
320 /* Detach from next 'bigger' objects */
321 SET_FOREACH(t, u->meta.names, i)
322 hashmap_remove_value(u->meta.manager->units, t, u);
324 if (u->meta.type != _UNIT_TYPE_INVALID)
325 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
327 if (u->meta.in_load_queue)
328 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
330 if (u->meta.in_dbus_queue)
331 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
333 if (u->meta.in_cleanup_queue)
334 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
336 if (u->meta.in_gc_queue) {
337 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
338 u->meta.manager->n_in_gc_queue--;
341 /* Free data and next 'smaller' objects */
343 job_free(u->meta.job);
345 if (u->meta.load_state != UNIT_STUB)
346 if (UNIT_VTABLE(u)->done)
347 UNIT_VTABLE(u)->done(u);
349 cgroup_bonding_free_list(u->meta.cgroup_bondings);
351 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
352 bidi_set_free(u, u->meta.dependencies[d]);
354 free(u->meta.description);
355 free(u->meta.fragment_path);
357 while ((t = set_steal_first(u->meta.names)))
359 set_free(u->meta.names);
361 free(u->meta.instance);
366 UnitActiveState unit_active_state(Unit *u) {
369 if (u->meta.load_state != UNIT_LOADED)
370 return UNIT_INACTIVE;
372 return UNIT_VTABLE(u)->active_state(u);
375 const char* unit_sub_state_to_string(Unit *u) {
378 return UNIT_VTABLE(u)->sub_state_to_string(u);
381 static void complete_move(Set **s, Set **other) {
389 set_move(*s, *other);
396 static void merge_names(Unit *u, Unit *other) {
403 complete_move(&u->meta.names, &other->meta.names);
405 while ((t = set_steal_first(other->meta.names)))
408 set_free(other->meta.names);
409 other->meta.names = NULL;
410 other->meta.id = NULL;
412 SET_FOREACH(t, u->meta.names, i)
413 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
416 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
423 assert(d < _UNIT_DEPENDENCY_MAX);
425 SET_FOREACH(back, other->meta.dependencies[d], i) {
428 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
429 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
432 set_remove(back->meta.dependencies[k], other);
434 assert(r == -ENOENT);
438 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
440 set_free(other->meta.dependencies[d]);
441 other->meta.dependencies[d] = NULL;
444 int unit_merge(Unit *u, Unit *other) {
449 assert(u->meta.manager == other->meta.manager);
450 assert(u->meta.type != _UNIT_TYPE_INVALID);
452 other = unit_follow_merge(other);
457 if (u->meta.type != other->meta.type)
460 if (!streq_ptr(u->meta.instance, other->meta.instance))
463 if (other->meta.load_state != UNIT_STUB &&
464 other->meta.load_state != UNIT_FAILED)
470 if (unit_active_state(other) != UNIT_INACTIVE)
474 merge_names(u, other);
476 /* Merge dependencies */
477 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
478 merge_dependencies(u, other, d);
480 other->meta.load_state = UNIT_MERGED;
481 other->meta.merged_into = u;
483 /* If there is still some data attached to the other node, we
484 * don't need it anymore, and can free it. */
485 if (other->meta.load_state != UNIT_STUB)
486 if (UNIT_VTABLE(other)->done)
487 UNIT_VTABLE(other)->done(other);
489 unit_add_to_dbus_queue(u);
490 unit_add_to_cleanup_queue(other);
495 int unit_merge_by_name(Unit *u, const char *name) {
503 if (unit_name_is_template(name)) {
504 if (!u->meta.instance)
507 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
513 if (!(other = manager_get_unit(u->meta.manager, name)))
514 r = unit_add_name(u, name);
516 r = unit_merge(u, other);
522 Unit* unit_follow_merge(Unit *u) {
525 while (u->meta.load_state == UNIT_MERGED)
526 assert_se(u = u->meta.merged_into);
531 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
537 if (c->std_output != EXEC_OUTPUT_KMSG &&
538 c->std_output != EXEC_OUTPUT_SYSLOG &&
539 c->std_error != EXEC_OUTPUT_KMSG &&
540 c->std_error != EXEC_OUTPUT_SYSLOG)
543 /* If syslog or kernel logging is requested, make sure our own
544 * logging daemon is run first. */
546 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
549 if (u->meta.manager->running_as != MANAGER_SESSION)
550 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
556 const char *unit_description(Unit *u) {
559 if (u->meta.description)
560 return u->meta.description;
565 void unit_dump(Unit *u, FILE *f, const char *prefix) {
573 timestamp1[FORMAT_TIMESTAMP_MAX],
574 timestamp2[FORMAT_TIMESTAMP_MAX],
575 timestamp3[FORMAT_TIMESTAMP_MAX],
576 timestamp4[FORMAT_TIMESTAMP_MAX];
579 assert(u->meta.type >= 0);
583 p2 = strappend(prefix, "\t");
584 prefix2 = p2 ? p2 : prefix;
588 "%s\tDescription: %s\n"
590 "%s\tUnit Load State: %s\n"
591 "%s\tUnit Active State: %s\n"
592 "%s\tInactive Exit Timestamp: %s\n"
593 "%s\tActive Enter Timestamp: %s\n"
594 "%s\tActive Exit Timestamp: %s\n"
595 "%s\tInactive Enter Timestamp: %s\n"
596 "%s\tGC Check Good: %s\n"
597 "%s\tOnly By Dependency: %s\n",
599 prefix, unit_description(u),
600 prefix, strna(u->meta.instance),
601 prefix, unit_load_state_to_string(u->meta.load_state),
602 prefix, unit_active_state_to_string(unit_active_state(u)),
603 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
604 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
605 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
606 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
607 prefix, yes_no(unit_check_gc(u)),
608 prefix, yes_no(u->meta.only_by_dependency));
610 SET_FOREACH(t, u->meta.names, i)
611 fprintf(f, "%s\tName: %s\n", prefix, t);
613 if (u->meta.fragment_path)
614 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
616 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
619 SET_FOREACH(other, u->meta.dependencies[d], i)
620 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
623 if (u->meta.load_state == UNIT_LOADED) {
625 "%s\tRecursive Stop: %s\n"
626 "%s\tStop When Unneeded: %s\n",
627 prefix, yes_no(u->meta.recursive_stop),
628 prefix, yes_no(u->meta.stop_when_unneeded));
630 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
631 fprintf(f, "%s\tControlGroup: %s:%s\n",
632 prefix, b->controller, b->path);
634 if (UNIT_VTABLE(u)->dump)
635 UNIT_VTABLE(u)->dump(u, f, prefix2);
637 } else if (u->meta.load_state == UNIT_MERGED)
639 "%s\tMerged into: %s\n",
640 prefix, u->meta.merged_into->meta.id);
643 job_dump(u->meta.job, f, prefix2);
648 /* Common implementation for multiple backends */
649 int unit_load_fragment_and_dropin(Unit *u) {
654 /* Load a .service file */
655 if ((r = unit_load_fragment(u)) < 0)
658 if (u->meta.load_state == UNIT_STUB)
661 /* Load drop-in directory data */
662 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
668 /* Common implementation for multiple backends */
669 int unit_load_fragment_and_dropin_optional(Unit *u) {
674 /* Same as unit_load_fragment_and_dropin(), but whether
675 * something can be loaded or not doesn't matter. */
677 /* Load a .service file */
678 if ((r = unit_load_fragment(u)) < 0)
681 if (u->meta.load_state == UNIT_STUB)
682 u->meta.load_state = UNIT_LOADED;
684 /* Load drop-in directory data */
685 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
691 /* Common implementation for multiple backends */
692 int unit_load_nop(Unit *u) {
695 if (u->meta.load_state == UNIT_STUB)
696 u->meta.load_state = UNIT_LOADED;
701 int unit_load(Unit *u) {
706 if (u->meta.in_load_queue) {
707 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
708 u->meta.in_load_queue = false;
711 if (u->meta.type == _UNIT_TYPE_INVALID)
714 if (u->meta.load_state != UNIT_STUB)
717 if (UNIT_VTABLE(u)->load)
718 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
721 if (u->meta.load_state == UNIT_STUB) {
726 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
728 unit_add_to_dbus_queue(unit_follow_merge(u));
729 unit_add_to_gc_queue(u);
734 u->meta.load_state = UNIT_FAILED;
735 unit_add_to_dbus_queue(u);
737 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
743 * -EBADR: This unit type does not support starting.
744 * -EALREADY: Unit is already started.
745 * -EAGAIN: An operation is already in progress. Retry later.
746 * -ECANCELED: Too many requests for now.
748 int unit_start(Unit *u) {
749 UnitActiveState state;
753 /* If this is already (being) started, then this will
754 * succeed. Note that this will even succeed if this unit is
755 * not startable by the user. This is relied on to detect when
756 * we need to wait for units and when waiting is finished. */
757 state = unit_active_state(u);
758 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
761 /* If it is stopped, but we cannot start it, then fail */
762 if (!UNIT_VTABLE(u)->start)
765 /* We don't suppress calls to ->start() here when we are
766 * already starting, to allow this request to be used as a
767 * "hurry up" call, for example when the unit is in some "auto
768 * restart" state where it waits for a holdoff timer to elapse
769 * before it will start again. */
771 unit_add_to_dbus_queue(u);
772 return UNIT_VTABLE(u)->start(u);
775 bool unit_can_start(Unit *u) {
778 return !!UNIT_VTABLE(u)->start;
782 * -EBADR: This unit type does not support stopping.
783 * -EALREADY: Unit is already stopped.
784 * -EAGAIN: An operation is already in progress. Retry later.
786 int unit_stop(Unit *u) {
787 UnitActiveState state;
791 state = unit_active_state(u);
792 if (state == UNIT_INACTIVE)
795 if (!UNIT_VTABLE(u)->stop)
798 unit_add_to_dbus_queue(u);
799 return UNIT_VTABLE(u)->stop(u);
803 * -EBADR: This unit type does not support reloading.
804 * -ENOEXEC: Unit is not started.
805 * -EAGAIN: An operation is already in progress. Retry later.
807 int unit_reload(Unit *u) {
808 UnitActiveState state;
812 if (!unit_can_reload(u))
815 state = unit_active_state(u);
816 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
819 if (unit_active_state(u) != UNIT_ACTIVE)
822 unit_add_to_dbus_queue(u);
823 return UNIT_VTABLE(u)->reload(u);
826 bool unit_can_reload(Unit *u) {
829 if (!UNIT_VTABLE(u)->reload)
832 if (!UNIT_VTABLE(u)->can_reload)
835 return UNIT_VTABLE(u)->can_reload(u);
838 static void unit_check_uneeded(Unit *u) {
844 /* If this service shall be shut down when unneeded then do
847 if (!u->meta.stop_when_unneeded)
850 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
853 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
854 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
857 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
858 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
861 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
862 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
865 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
867 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
868 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
871 static void retroactively_start_dependencies(Unit *u) {
876 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
878 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
879 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
880 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
882 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
883 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
884 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
886 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
887 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
888 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
890 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
891 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
892 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
894 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
895 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
896 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
899 static void retroactively_stop_dependencies(Unit *u) {
904 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
906 if (u->meta.recursive_stop) {
907 /* Pull down units need us recursively if enabled */
908 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
909 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
910 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
913 /* Garbage collect services that might not be needed anymore, if enabled */
914 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
915 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
916 unit_check_uneeded(other);
917 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
918 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
919 unit_check_uneeded(other);
920 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
921 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
922 unit_check_uneeded(other);
923 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
924 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
925 unit_check_uneeded(other);
926 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
927 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
928 unit_check_uneeded(other);
931 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
932 bool unexpected = false;
936 assert(os < _UNIT_ACTIVE_STATE_MAX);
937 assert(ns < _UNIT_ACTIVE_STATE_MAX);
939 /* Note that this is called for all low-level state changes,
940 * even if they might map to the same high-level
941 * UnitActiveState! That means that ns == os is OK an expected
942 * behaviour here. For example: if a mount point is remounted
943 * this function will be called too and the utmp code below
948 if (os == UNIT_INACTIVE && ns != UNIT_INACTIVE)
949 u->meta.inactive_exit_timestamp = ts;
950 else if (os != UNIT_INACTIVE && ns == UNIT_INACTIVE)
951 u->meta.inactive_enter_timestamp = ts;
953 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
954 u->meta.active_enter_timestamp = ts;
955 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
956 u->meta.active_exit_timestamp = ts;
958 timer_unit_notify(u, ns);
962 if (u->meta.job->state == JOB_WAITING)
964 /* So we reached a different state for this
965 * job. Let's see if we can run it now if it
966 * failed previously due to EAGAIN. */
967 job_add_to_run_queue(u->meta.job);
970 assert(u->meta.job->state == JOB_RUNNING);
972 /* Let's check whether this state change
973 * constitutes a finished job, or maybe
974 * cotradicts a running job and hence needs to
975 * invalidate jobs. */
977 switch (u->meta.job->type) {
980 case JOB_VERIFY_ACTIVE:
982 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
983 job_finish_and_invalidate(u->meta.job, true);
984 else if (ns != UNIT_ACTIVATING) {
986 job_finish_and_invalidate(u->meta.job, false);
992 case JOB_RELOAD_OR_START:
994 if (ns == UNIT_ACTIVE)
995 job_finish_and_invalidate(u->meta.job, true);
996 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
998 job_finish_and_invalidate(u->meta.job, false);
1005 case JOB_TRY_RESTART:
1007 if (ns == UNIT_INACTIVE)
1008 job_finish_and_invalidate(u->meta.job, true);
1009 else if (ns != UNIT_DEACTIVATING) {
1011 job_finish_and_invalidate(u->meta.job, false);
1017 assert_not_reached("Job type unknown");
1022 /* If this state change happened without being requested by a
1023 * job, then let's retroactively start or stop dependencies */
1026 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1027 retroactively_start_dependencies(u);
1028 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1029 retroactively_stop_dependencies(u);
1032 /* Some names are special */
1033 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1034 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
1035 /* The bus just might have become available,
1036 * hence try to connect to it, if we aren't
1038 bus_init_system(u->meta.manager);
1039 bus_init_api(u->meta.manager);
1042 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1043 /* The syslog daemon just might have become
1044 * available, hence try to connect to it, if
1045 * we aren't yet connected. */
1048 if (u->meta.type == UNIT_MOUNT)
1049 /* Another directory became available, let's
1050 * check if that is enough to write our utmp
1052 manager_write_utmp_reboot(u->meta.manager);
1054 if (u->meta.type == UNIT_TARGET)
1055 /* A target got activated, maybe this is a runlevel? */
1056 manager_write_utmp_runlevel(u->meta.manager, u);
1058 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1060 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1061 /* The syslog daemon might just have
1062 * terminated, hence try to disconnect from
1066 /* We don't care about D-Bus here, since we'll get an
1067 * asynchronous notification for it anyway. */
1070 /* Maybe we finished startup and are now ready for being
1071 * stopped because unneeded? */
1072 unit_check_uneeded(u);
1074 unit_add_to_dbus_queue(u);
1075 unit_add_to_gc_queue(u);
1078 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1079 struct epoll_event ev;
1084 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1090 if (epoll_ctl(u->meta.manager->epoll_fd,
1091 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1103 void unit_unwatch_fd(Unit *u, Watch *w) {
1107 if (w->type == WATCH_INVALID)
1110 assert(w->type == WATCH_FD);
1111 assert(w->data.unit == u);
1112 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1115 w->type = WATCH_INVALID;
1116 w->data.unit = NULL;
1119 int unit_watch_pid(Unit *u, pid_t pid) {
1123 /* Watch a specific PID. We only support one unit watching
1124 * each PID for now. */
1126 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1129 void unit_unwatch_pid(Unit *u, pid_t pid) {
1133 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1136 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1137 struct itimerspec its;
1143 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1145 /* This will try to reuse the old timer if there is one */
1147 if (w->type == WATCH_TIMER) {
1152 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1159 /* Set absolute time in the past, but not 0, since we
1160 * don't want to disarm the timer */
1161 its.it_value.tv_sec = 0;
1162 its.it_value.tv_nsec = 1;
1164 flags = TFD_TIMER_ABSTIME;
1166 timespec_store(&its.it_value, delay);
1170 /* This will also flush the elapse counter */
1171 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1174 if (w->type == WATCH_INVALID) {
1175 struct epoll_event ev;
1179 ev.events = EPOLLIN;
1181 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1186 w->type = WATCH_TIMER;
1193 close_nointr_nofail(fd);
1198 void unit_unwatch_timer(Unit *u, Watch *w) {
1202 if (w->type == WATCH_INVALID)
1205 assert(w->type == WATCH_TIMER && w->data.unit == u);
1207 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1208 close_nointr_nofail(w->fd);
1211 w->type = WATCH_INVALID;
1212 w->data.unit = NULL;
1215 bool unit_job_is_applicable(Unit *u, JobType j) {
1217 assert(j >= 0 && j < _JOB_TYPE_MAX);
1221 case JOB_VERIFY_ACTIVE:
1227 case JOB_TRY_RESTART:
1228 return unit_can_start(u);
1231 return unit_can_reload(u);
1233 case JOB_RELOAD_OR_START:
1234 return unit_can_reload(u) && unit_can_start(u);
1237 assert_not_reached("Invalid job type");
1241 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1243 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1244 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1245 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1246 [UNIT_WANTS] = UNIT_WANTED_BY,
1247 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1248 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1249 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1250 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1251 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1252 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1253 [UNIT_BEFORE] = UNIT_AFTER,
1254 [UNIT_AFTER] = UNIT_BEFORE,
1255 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1256 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1258 int r, q = 0, v = 0, w = 0;
1261 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1262 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1265 /* We won't allow dependencies on ourselves. We will not
1266 * consider them an error however. */
1270 if (UNIT_VTABLE(u)->no_requires &&
1271 (d == UNIT_REQUIRES ||
1272 d == UNIT_REQUIRES_OVERRIDABLE ||
1273 d == UNIT_REQUISITE ||
1274 d == UNIT_REQUISITE_OVERRIDABLE)) {
1278 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0 ||
1279 (r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1283 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1284 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1287 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1290 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1295 if (add_reference) {
1296 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1301 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1305 unit_add_to_dbus_queue(u);
1310 set_remove(u->meta.dependencies[d], other);
1313 set_remove(other->meta.dependencies[inverse_table[d]], u);
1316 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1321 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1325 assert(name || path);
1328 name = file_name_from_path(path);
1330 if (!unit_name_is_template(name)) {
1335 if (u->meta.instance)
1336 s = unit_name_replace_instance(name, u->meta.instance);
1340 if (!(i = unit_name_to_prefix(u->meta.id)))
1343 s = unit_name_replace_instance(name, i);
1354 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1360 assert(name || path);
1362 if (!(name = resolve_template(u, name, path, &s)))
1365 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1368 r = unit_add_dependency(u, d, other, add_reference);
1375 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1381 assert(name || path);
1383 if (!(name = resolve_template(u, name, path, &s)))
1386 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1389 r = unit_add_dependency(other, d, u, add_reference);
1396 int set_unit_path(const char *p) {
1400 /* This is mostly for debug purposes */
1402 if (path_is_absolute(p)) {
1403 if (!(c = strdup(p)))
1406 if (!(cwd = get_current_dir_name()))
1409 r = asprintf(&c, "%s/%s", cwd, p);
1416 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1425 char *unit_dbus_path(Unit *u) {
1430 if (!(e = bus_path_escape(u->meta.id)))
1433 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1442 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1450 /* Ensure this hasn't been added yet */
1453 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1454 LIST_PREPEND(CGroupBonding, by_path, l, b);
1456 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1457 LIST_REMOVE(CGroupBonding, by_path, l, b);
1461 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1467 static char *default_cgroup_path(Unit *u) {
1473 if (u->meta.instance) {
1476 if (!(t = unit_name_template(u->meta.id)))
1479 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1482 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1484 return r < 0 ? NULL : p;
1487 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1489 char *controller = NULL, *path = NULL;
1490 CGroupBonding *b = NULL;
1496 /* Detect controller name */
1497 n = strcspn(name, ":");
1500 (name[n] == ':' && name[n+1] == 0)) {
1502 /* Only controller name, no path? */
1504 if (!(path = default_cgroup_path(u)))
1510 /* Controller name, and path. */
1513 if (!path_is_absolute(p))
1516 if (!(path = strdup(p)))
1521 controller = strndup(name, n);
1523 controller = strdup(u->meta.manager->cgroup_controller);
1530 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1535 if (!(b = new0(CGroupBonding, 1))) {
1540 b->controller = controller;
1543 b->clean_up = false;
1545 if ((r = unit_add_cgroup(u, b)) < 0)
1558 int unit_add_default_cgroup(Unit *u) {
1564 /* Adds in the default cgroup data, if it wasn't specified yet */
1566 if (unit_get_default_cgroup(u))
1569 if (!(b = new0(CGroupBonding, 1)))
1572 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1575 if (!(b->path = default_cgroup_path(u)))
1581 if ((r = unit_add_cgroup(u, b)) < 0)
1588 free(b->controller);
1594 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1597 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1600 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1608 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1611 assert(!unit_has_name(u, t));
1613 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1616 assert(r < 0 || *_found != u);
1621 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1629 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1632 assert(!unit_has_name(u, t));
1634 found = manager_get_unit(u->meta.manager, t);
1644 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1648 return unit_name_to_prefix_and_instance(u->meta.id);
1651 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1655 return unit_name_to_prefix(u->meta.id);
1658 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1664 if (!(p = unit_name_to_prefix(u->meta.id)))
1667 r = unit_name_unescape(p);
1673 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1677 if (u->meta.instance)
1678 return unit_name_unescape(u->meta.instance);
1683 char *unit_name_printf(Unit *u, const char* format) {
1686 * This will use the passed string as format string and
1687 * replace the following specifiers:
1689 * %n: the full id of the unit (foo@bar.waldo)
1690 * %N: the id of the unit without the suffix (foo@bar)
1691 * %p: the prefix (foo)
1692 * %i: the instance (bar)
1695 const Specifier table[] = {
1696 { 'n', specifier_string, u->meta.id },
1697 { 'N', specifier_prefix_and_instance, NULL },
1698 { 'p', specifier_prefix, NULL },
1699 { 'i', specifier_string, u->meta.instance },
1706 return specifier_printf(format, table, u);
1709 char *unit_full_printf(Unit *u, const char *format) {
1711 /* This is similar to unit_name_printf() but also supports
1714 const Specifier table[] = {
1715 { 'n', specifier_string, u->meta.id },
1716 { 'N', specifier_prefix_and_instance, NULL },
1717 { 'p', specifier_prefix, NULL },
1718 { 'P', specifier_prefix_unescaped, NULL },
1719 { 'i', specifier_string, u->meta.instance },
1720 { 'I', specifier_instance_unescaped, NULL },
1727 return specifier_printf(format, table, u);
1730 char **unit_full_printf_strv(Unit *u, char **l) {
1734 /* Applies unit_full_printf to every entry in l */
1739 if (!(r = new(char*, n+1)))
1742 for (i = l, j = r; *i; i++, j++)
1743 if (!(*j = unit_full_printf(u, *i)))
1759 int unit_watch_bus_name(Unit *u, const char *name) {
1763 /* Watch a specific name on the bus. We only support one unit
1764 * watching each name for now. */
1766 return hashmap_put(u->meta.manager->watch_bus, name, u);
1769 void unit_unwatch_bus_name(Unit *u, const char *name) {
1773 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1776 bool unit_can_serialize(Unit *u) {
1779 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1782 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1789 if (!unit_can_serialize(u))
1792 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1800 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1811 va_start(ap, format);
1812 vfprintf(f, format, ap);
1818 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1824 fprintf(f, "%s=%s\n", key, value);
1827 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1834 if (!unit_can_serialize(u))
1838 char line[1024], *l, *v;
1841 if (!fgets(line, sizeof(line), f)) {
1853 k = strcspn(l, "=");
1861 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1866 int unit_add_node_link(Unit *u, const char *what, bool wants) {
1876 /* Adds in links to the device node that this unit is based on */
1878 if (!is_device_path(what))
1881 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
1884 r = manager_load_unit(u->meta.manager, e, NULL, &device);
1890 if ((r = unit_add_dependency(u, UNIT_AFTER, device, true)) < 0)
1893 if ((r = unit_add_dependency(u, UNIT_REQUIRES, device, true)) < 0)
1897 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
1903 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1904 [UNIT_SERVICE] = "service",
1905 [UNIT_TIMER] = "timer",
1906 [UNIT_SOCKET] = "socket",
1907 [UNIT_TARGET] = "target",
1908 [UNIT_DEVICE] = "device",
1909 [UNIT_MOUNT] = "mount",
1910 [UNIT_AUTOMOUNT] = "automount",
1911 [UNIT_SNAPSHOT] = "snapshot",
1912 [UNIT_SWAP] = "swap"
1915 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1917 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1918 [UNIT_STUB] = "stub",
1919 [UNIT_LOADED] = "loaded",
1920 [UNIT_FAILED] = "failed",
1921 [UNIT_MERGED] = "merged"
1924 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1926 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1927 [UNIT_ACTIVE] = "active",
1928 [UNIT_INACTIVE] = "inactive",
1929 [UNIT_ACTIVATING] = "activating",
1930 [UNIT_DEACTIVATING] = "deactivating"
1933 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1935 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1936 [UNIT_REQUIRES] = "Requires",
1937 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1938 [UNIT_WANTS] = "Wants",
1939 [UNIT_REQUISITE] = "Requisite",
1940 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1941 [UNIT_REQUIRED_BY] = "RequiredBy",
1942 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1943 [UNIT_WANTED_BY] = "WantedBy",
1944 [UNIT_CONFLICTS] = "Conflicts",
1945 [UNIT_BEFORE] = "Before",
1946 [UNIT_AFTER] = "After",
1947 [UNIT_REFERENCES] = "References",
1948 [UNIT_REFERENCED_BY] = "ReferencedBy"
1951 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1953 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1954 [KILL_CONTROL_GROUP] = "control-group",
1955 [KILL_PROCESS_GROUP] = "process-group",
1956 [KILL_PROCESS] = "process",
1957 [KILL_NONE] = "none"
1960 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);