1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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>
36 #include "load-fragment.h"
37 #include "load-dropin.h"
39 #include "unit-name.h"
40 #include "specifier.h"
41 #include "dbus-unit.h"
43 #include "cgroup-util.h"
46 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
47 [UNIT_SERVICE] = &service_vtable,
48 [UNIT_TIMER] = &timer_vtable,
49 [UNIT_SOCKET] = &socket_vtable,
50 [UNIT_TARGET] = &target_vtable,
51 [UNIT_DEVICE] = &device_vtable,
52 [UNIT_MOUNT] = &mount_vtable,
53 [UNIT_AUTOMOUNT] = &automount_vtable,
54 [UNIT_SNAPSHOT] = &snapshot_vtable,
55 [UNIT_SWAP] = &swap_vtable,
56 [UNIT_PATH] = &path_vtable
59 Unit *unit_new(Manager *m) {
64 if (!(u = new0(Unit, 1)))
67 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
73 u->meta.type = _UNIT_TYPE_INVALID;
74 u->meta.deserialized_job = _JOB_TYPE_INVALID;
75 u->meta.default_dependencies = true;
80 bool unit_has_name(Unit *u, const char *name) {
84 return !!set_get(u->meta.names, (char*) name);
87 int unit_add_name(Unit *u, const char *text) {
95 if (unit_name_is_template(text)) {
96 if (!u->meta.instance)
99 s = unit_name_replace_instance(text, u->meta.instance);
106 if (!unit_name_is_valid(s, false)) {
111 assert_se((t = unit_name_to_type(s)) >= 0);
113 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
118 if ((r = unit_name_to_instance(s, &i)) < 0)
121 if (i && unit_vtable[t]->no_instances)
124 /* Ensure that this unit is either instanced or not instanced,
126 if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
131 if (unit_vtable[t]->no_alias &&
132 !set_isempty(u->meta.names) &&
133 !set_get(u->meta.names, s)) {
138 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
143 if ((r = set_put(u->meta.names, s)) < 0) {
149 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
150 set_remove(u->meta.names, s);
154 if (u->meta.type == _UNIT_TYPE_INVALID) {
158 u->meta.instance = i;
160 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
162 if (UNIT_VTABLE(u)->init)
163 UNIT_VTABLE(u)->init(u);
167 unit_add_to_dbus_queue(u);
177 int unit_choose_id(Unit *u, const char *name) {
178 char *s, *t = NULL, *i;
184 if (unit_name_is_template(name)) {
186 if (!u->meta.instance)
189 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
195 /* Selects one of the names of this unit as the id */
196 s = set_get(u->meta.names, (char*) name);
202 if ((r = unit_name_to_instance(s, &i)) < 0)
207 free(u->meta.instance);
208 u->meta.instance = i;
210 unit_add_to_dbus_queue(u);
215 int unit_set_description(Unit *u, const char *description) {
220 if (!(s = strdup(description)))
223 free(u->meta.description);
224 u->meta.description = s;
226 unit_add_to_dbus_queue(u);
230 bool unit_check_gc(Unit *u) {
233 if (u->meta.load_state == UNIT_STUB)
236 if (UNIT_VTABLE(u)->no_gc)
245 if (unit_active_state(u) != UNIT_INACTIVE)
248 if (UNIT_VTABLE(u)->check_gc)
249 if (UNIT_VTABLE(u)->check_gc(u))
255 void unit_add_to_load_queue(Unit *u) {
257 assert(u->meta.type != _UNIT_TYPE_INVALID);
259 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
262 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
263 u->meta.in_load_queue = true;
266 void unit_add_to_cleanup_queue(Unit *u) {
269 if (u->meta.in_cleanup_queue)
272 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
273 u->meta.in_cleanup_queue = true;
276 void unit_add_to_gc_queue(Unit *u) {
279 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
282 if (unit_check_gc(u))
285 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
286 u->meta.in_gc_queue = true;
288 u->meta.manager->n_in_gc_queue ++;
290 if (u->meta.manager->gc_queue_timestamp <= 0)
291 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
294 void unit_add_to_dbus_queue(Unit *u) {
296 assert(u->meta.type != _UNIT_TYPE_INVALID);
298 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
301 /* Shortcut things if nobody cares */
302 if (!bus_has_subscriber(u->meta.manager)) {
303 u->meta.sent_dbus_new_signal = true;
307 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
308 u->meta.in_dbus_queue = true;
311 static void bidi_set_free(Unit *u, Set *s) {
317 /* Frees the set and makes sure we are dropped from the
318 * inverse pointers */
320 SET_FOREACH(other, s, i) {
323 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
324 set_remove(other->meta.dependencies[d], u);
326 unit_add_to_gc_queue(other);
332 void unit_free(Unit *u) {
339 bus_unit_send_removed_signal(u);
341 if (u->meta.load_state != UNIT_STUB)
342 if (UNIT_VTABLE(u)->done)
343 UNIT_VTABLE(u)->done(u);
345 SET_FOREACH(t, u->meta.names, i)
346 hashmap_remove_value(u->meta.manager->units, t, u);
349 job_free(u->meta.job);
351 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
352 bidi_set_free(u, u->meta.dependencies[d]);
354 if (u->meta.type != _UNIT_TYPE_INVALID)
355 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
357 if (u->meta.in_load_queue)
358 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
360 if (u->meta.in_dbus_queue)
361 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
363 if (u->meta.in_cleanup_queue)
364 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
366 if (u->meta.in_gc_queue) {
367 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
368 u->meta.manager->n_in_gc_queue--;
371 cgroup_bonding_free_list(u->meta.cgroup_bondings);
373 free(u->meta.description);
374 free(u->meta.fragment_path);
376 set_free_free(u->meta.names);
378 condition_free_list(u->meta.conditions);
380 free(u->meta.instance);
384 UnitActiveState unit_active_state(Unit *u) {
387 if (u->meta.load_state == UNIT_MERGED)
388 return unit_active_state(unit_follow_merge(u));
390 /* After a reload it might happen that a unit is not correctly
391 * loaded but still has a process around. That's why we won't
392 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
394 return UNIT_VTABLE(u)->active_state(u);
397 const char* unit_sub_state_to_string(Unit *u) {
400 return UNIT_VTABLE(u)->sub_state_to_string(u);
403 static void complete_move(Set **s, Set **other) {
411 set_move(*s, *other);
418 static void merge_names(Unit *u, Unit *other) {
425 complete_move(&u->meta.names, &other->meta.names);
427 set_free_free(other->meta.names);
428 other->meta.names = NULL;
429 other->meta.id = NULL;
431 SET_FOREACH(t, u->meta.names, i)
432 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
435 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
442 assert(d < _UNIT_DEPENDENCY_MAX);
444 /* Fix backwards pointers */
445 SET_FOREACH(back, other->meta.dependencies[d], i) {
448 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
449 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
452 set_remove(back->meta.dependencies[k], other);
454 assert(r == -ENOENT);
458 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
460 set_free(other->meta.dependencies[d]);
461 other->meta.dependencies[d] = NULL;
464 int unit_merge(Unit *u, Unit *other) {
469 assert(u->meta.manager == other->meta.manager);
470 assert(u->meta.type != _UNIT_TYPE_INVALID);
472 other = unit_follow_merge(other);
477 if (u->meta.type != other->meta.type)
480 if (!u->meta.instance != !other->meta.instance)
483 if (other->meta.load_state != UNIT_STUB &&
484 other->meta.load_state != UNIT_ERROR)
490 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
494 merge_names(u, other);
496 /* Merge dependencies */
497 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
498 merge_dependencies(u, other, d);
500 other->meta.load_state = UNIT_MERGED;
501 other->meta.merged_into = u;
503 /* If there is still some data attached to the other node, we
504 * don't need it anymore, and can free it. */
505 if (other->meta.load_state != UNIT_STUB)
506 if (UNIT_VTABLE(other)->done)
507 UNIT_VTABLE(other)->done(other);
509 unit_add_to_dbus_queue(u);
510 unit_add_to_cleanup_queue(other);
515 int unit_merge_by_name(Unit *u, const char *name) {
523 if (unit_name_is_template(name)) {
524 if (!u->meta.instance)
527 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
533 if (!(other = manager_get_unit(u->meta.manager, name)))
534 r = unit_add_name(u, name);
536 r = unit_merge(u, other);
542 Unit* unit_follow_merge(Unit *u) {
545 while (u->meta.load_state == UNIT_MERGED)
546 assert_se(u = u->meta.merged_into);
551 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
557 if (c->std_output != EXEC_OUTPUT_KMSG &&
558 c->std_output != EXEC_OUTPUT_SYSLOG &&
559 c->std_error != EXEC_OUTPUT_KMSG &&
560 c->std_error != EXEC_OUTPUT_SYSLOG)
563 /* If syslog or kernel logging is requested, make sure our own
564 * logging daemon is run first. */
566 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
569 if (u->meta.manager->running_as == MANAGER_SYSTEM)
570 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
576 const char *unit_description(Unit *u) {
579 if (u->meta.description)
580 return u->meta.description;
582 return strna(u->meta.id);
585 void unit_dump(Unit *u, FILE *f, const char *prefix) {
593 timestamp1[FORMAT_TIMESTAMP_MAX],
594 timestamp2[FORMAT_TIMESTAMP_MAX],
595 timestamp3[FORMAT_TIMESTAMP_MAX],
596 timestamp4[FORMAT_TIMESTAMP_MAX],
597 timespan[FORMAT_TIMESPAN_MAX];
601 assert(u->meta.type >= 0);
605 p2 = strappend(prefix, "\t");
606 prefix2 = p2 ? p2 : prefix;
610 "%s\tDescription: %s\n"
612 "%s\tUnit Load State: %s\n"
613 "%s\tUnit Active State: %s\n"
614 "%s\tInactive Exit Timestamp: %s\n"
615 "%s\tActive Enter Timestamp: %s\n"
616 "%s\tActive Exit Timestamp: %s\n"
617 "%s\tInactive Enter Timestamp: %s\n"
618 "%s\tGC Check Good: %s\n"
619 "%s\tNeed Daemon Reload: %s\n",
621 prefix, unit_description(u),
622 prefix, strna(u->meta.instance),
623 prefix, unit_load_state_to_string(u->meta.load_state),
624 prefix, unit_active_state_to_string(unit_active_state(u)),
625 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
626 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
627 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
628 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
629 prefix, yes_no(unit_check_gc(u)),
630 prefix, yes_no(unit_need_daemon_reload(u)));
632 SET_FOREACH(t, u->meta.names, i)
633 fprintf(f, "%s\tName: %s\n", prefix, t);
635 if ((following = unit_following(u)))
636 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
638 if (u->meta.fragment_path)
639 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
641 if (u->meta.job_timeout > 0)
642 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
644 condition_dump_list(u->meta.conditions, f, prefix);
646 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
649 SET_FOREACH(other, u->meta.dependencies[d], i)
650 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
653 if (u->meta.load_state == UNIT_LOADED) {
655 "%s\tStopWhenUnneeded: %s\n"
656 "%s\tRefuseManualStart: %s\n"
657 "%s\tRefuseManualStop: %s\n"
658 "%s\tDefaultDependencies: %s\n",
659 prefix, yes_no(u->meta.stop_when_unneeded),
660 prefix, yes_no(u->meta.refuse_manual_start),
661 prefix, yes_no(u->meta.refuse_manual_stop),
662 prefix, yes_no(u->meta.default_dependencies));
664 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
665 fprintf(f, "%s\tControlGroup: %s:%s\n",
666 prefix, b->controller, b->path);
668 if (UNIT_VTABLE(u)->dump)
669 UNIT_VTABLE(u)->dump(u, f, prefix2);
671 } else if (u->meta.load_state == UNIT_MERGED)
673 "%s\tMerged into: %s\n",
674 prefix, u->meta.merged_into->meta.id);
675 else if (u->meta.load_state == UNIT_ERROR)
676 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
680 job_dump(u->meta.job, f, prefix2);
685 /* Common implementation for multiple backends */
686 int unit_load_fragment_and_dropin(Unit *u) {
691 /* Load a .service file */
692 if ((r = unit_load_fragment(u)) < 0)
695 if (u->meta.load_state == UNIT_STUB)
698 /* Load drop-in directory data */
699 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
705 /* Common implementation for multiple backends */
706 int unit_load_fragment_and_dropin_optional(Unit *u) {
711 /* Same as unit_load_fragment_and_dropin(), but whether
712 * something can be loaded or not doesn't matter. */
714 /* Load a .service file */
715 if ((r = unit_load_fragment(u)) < 0)
718 if (u->meta.load_state == UNIT_STUB)
719 u->meta.load_state = UNIT_LOADED;
721 /* Load drop-in directory data */
722 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
728 int unit_add_default_target_dependency(Unit *u, Unit *target) {
732 if (target->meta.type != UNIT_TARGET)
735 /* Only add the dependency if boths units are loaded, so that
736 * that loop check below is reliable */
737 if (u->meta.load_state != UNIT_LOADED ||
738 target->meta.load_state != UNIT_LOADED)
741 /* Don't create loops */
742 if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
745 return unit_add_dependency(target, UNIT_AFTER, u, true);
748 static int unit_add_default_dependencies(Unit *u) {
755 SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY], i)
756 if ((r = unit_add_default_target_dependency(u, target)) < 0)
759 SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
760 if ((r = unit_add_default_target_dependency(u, target)) < 0)
763 SET_FOREACH(target, u->meta.dependencies[UNIT_WANTED_BY], i)
764 if ((r = unit_add_default_target_dependency(u, target)) < 0)
767 SET_FOREACH(target, u->meta.dependencies[UNIT_BOUND_BY], i)
768 if ((r = unit_add_default_target_dependency(u, target)) < 0)
774 int unit_load(Unit *u) {
779 if (u->meta.in_load_queue) {
780 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
781 u->meta.in_load_queue = false;
784 if (u->meta.type == _UNIT_TYPE_INVALID)
787 if (u->meta.load_state != UNIT_STUB)
790 if (UNIT_VTABLE(u)->load)
791 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
794 if (u->meta.load_state == UNIT_STUB) {
799 if (u->meta.load_state == UNIT_LOADED &&
800 u->meta.default_dependencies)
801 if ((r = unit_add_default_dependencies(u)) < 0)
804 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
806 unit_add_to_dbus_queue(unit_follow_merge(u));
807 unit_add_to_gc_queue(u);
812 u->meta.load_state = UNIT_ERROR;
813 u->meta.load_error = r;
814 unit_add_to_dbus_queue(u);
816 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
822 * -EBADR: This unit type does not support starting.
823 * -EALREADY: Unit is already started.
824 * -EAGAIN: An operation is already in progress. Retry later.
825 * -ECANCELED: Too many requests for now.
827 int unit_start(Unit *u) {
828 UnitActiveState state;
833 if (u->meta.load_state != UNIT_LOADED)
836 /* If this is already (being) started, then this will
837 * succeed. Note that this will even succeed if this unit is
838 * not startable by the user. This is relied on to detect when
839 * we need to wait for units and when waiting is finished. */
840 state = unit_active_state(u);
841 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
844 /* If the conditions failed, don't do anything at all */
845 if (!condition_test_list(u->meta.conditions)) {
846 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
850 /* Forward to the main object, if we aren't it. */
851 if ((following = unit_following(u))) {
852 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
853 return unit_start(following);
856 /* If it is stopped, but we cannot start it, then fail */
857 if (!UNIT_VTABLE(u)->start)
860 /* We don't suppress calls to ->start() here when we are
861 * already starting, to allow this request to be used as a
862 * "hurry up" call, for example when the unit is in some "auto
863 * restart" state where it waits for a holdoff timer to elapse
864 * before it will start again. */
866 unit_add_to_dbus_queue(u);
868 unit_status_printf(u, "Starting %s...\n", unit_description(u));
869 return UNIT_VTABLE(u)->start(u);
872 bool unit_can_start(Unit *u) {
875 return !!UNIT_VTABLE(u)->start;
878 bool unit_can_isolate(Unit *u) {
881 return unit_can_start(u) &&
882 u->meta.allow_isolate;
886 * -EBADR: This unit type does not support stopping.
887 * -EALREADY: Unit is already stopped.
888 * -EAGAIN: An operation is already in progress. Retry later.
890 int unit_stop(Unit *u) {
891 UnitActiveState state;
896 state = unit_active_state(u);
897 if (UNIT_IS_INACTIVE_OR_FAILED(state))
900 if ((following = unit_following(u))) {
901 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
902 return unit_stop(following);
905 if (!UNIT_VTABLE(u)->stop)
908 unit_add_to_dbus_queue(u);
910 unit_status_printf(u, "Stopping %s...\n", unit_description(u));
911 return UNIT_VTABLE(u)->stop(u);
915 * -EBADR: This unit type does not support reloading.
916 * -ENOEXEC: Unit is not started.
917 * -EAGAIN: An operation is already in progress. Retry later.
919 int unit_reload(Unit *u) {
920 UnitActiveState state;
925 if (u->meta.load_state != UNIT_LOADED)
928 if (!unit_can_reload(u))
931 state = unit_active_state(u);
932 if (state == UNIT_RELOADING)
935 if (state != UNIT_ACTIVE)
938 if ((following = unit_following(u))) {
939 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
940 return unit_reload(following);
943 unit_add_to_dbus_queue(u);
944 return UNIT_VTABLE(u)->reload(u);
947 bool unit_can_reload(Unit *u) {
950 if (!UNIT_VTABLE(u)->reload)
953 if (!UNIT_VTABLE(u)->can_reload)
956 return UNIT_VTABLE(u)->can_reload(u);
959 static void unit_check_unneeded(Unit *u) {
965 /* If this service shall be shut down when unneeded then do
968 if (!u->meta.stop_when_unneeded)
971 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
974 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
975 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
978 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
979 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
982 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
983 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
986 SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
987 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
990 log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
992 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
993 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
996 static void retroactively_start_dependencies(Unit *u) {
1001 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1003 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1004 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1005 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1006 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1008 SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1009 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1010 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1011 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1013 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1014 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1015 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1016 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1018 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1019 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1020 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1021 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1023 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1024 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1025 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1026 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1028 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1029 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1030 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1032 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1033 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1034 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1037 static void retroactively_stop_dependencies(Unit *u) {
1042 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1044 /* Pull down units which are bound to us recursively if enabled */
1045 SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1046 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1047 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1049 /* Garbage collect services that might not be needed anymore, if enabled */
1050 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1051 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1052 unit_check_unneeded(other);
1053 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1054 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1055 unit_check_unneeded(other);
1056 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1057 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1058 unit_check_unneeded(other);
1059 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1060 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1061 unit_check_unneeded(other);
1062 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1063 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1064 unit_check_unneeded(other);
1065 SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1066 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1067 unit_check_unneeded(other);
1070 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
1075 assert(os < _UNIT_ACTIVE_STATE_MAX);
1076 assert(ns < _UNIT_ACTIVE_STATE_MAX);
1078 /* Note that this is called for all low-level state changes,
1079 * even if they might map to the same high-level
1080 * UnitActiveState! That means that ns == os is OK an expected
1081 * behaviour here. For example: if a mount point is remounted
1082 * this function will be called too! */
1084 dual_timestamp_get(&ts);
1086 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1087 u->meta.inactive_exit_timestamp = ts;
1088 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1089 u->meta.inactive_enter_timestamp = ts;
1091 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1092 u->meta.active_enter_timestamp = ts;
1093 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1094 u->meta.active_exit_timestamp = ts;
1096 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1097 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1099 timer_unit_notify(u, ns);
1100 path_unit_notify(u, ns);
1105 if (u->meta.job->state == JOB_WAITING)
1107 /* So we reached a different state for this
1108 * job. Let's see if we can run it now if it
1109 * failed previously due to EAGAIN. */
1110 job_add_to_run_queue(u->meta.job);
1112 /* Let's check whether this state change constitutes a
1113 * finished job, or maybe cotradicts a running job and
1114 * hence needs to invalidate jobs. */
1116 switch (u->meta.job->type) {
1119 case JOB_VERIFY_ACTIVE:
1121 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1122 job_finish_and_invalidate(u->meta.job, true);
1123 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1126 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1127 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1133 case JOB_RELOAD_OR_START:
1135 if (u->meta.job->state == JOB_RUNNING) {
1136 if (ns == UNIT_ACTIVE)
1137 job_finish_and_invalidate(u->meta.job, true);
1138 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1141 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1142 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1150 case JOB_TRY_RESTART:
1152 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1153 job_finish_and_invalidate(u->meta.job, true);
1154 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1156 job_finish_and_invalidate(u->meta.job, false);
1162 assert_not_reached("Job type unknown");
1168 /* If this state change happened without being requested by a
1169 * job, then let's retroactively start or stop
1170 * dependencies. We skip that step when deserializing, since
1171 * we don't want to create any additional jobs just because
1172 * something is already activated. */
1174 if (unexpected && u->meta.manager->n_deserializing <= 0) {
1175 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1176 retroactively_start_dependencies(u);
1177 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1178 retroactively_stop_dependencies(u);
1181 if (ns != os && ns == UNIT_FAILED) {
1185 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1186 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1188 log_notice("Unit %s entered failed state.", u->meta.id);
1191 /* Some names are special */
1192 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1193 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1194 /* The bus just might have become available,
1195 * hence try to connect to it, if we aren't
1197 bus_init(u->meta.manager);
1199 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1200 /* The syslog daemon just might have become
1201 * available, hence try to connect to it, if
1202 * we aren't yet connected. */
1205 if (u->meta.type == UNIT_SERVICE &&
1206 !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1207 /* Write audit record if we have just finished starting up */
1208 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1209 u->meta.in_audit = true;
1212 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1213 manager_send_unit_plymouth(u->meta.manager, u);
1217 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1218 /* The syslog daemon might just have
1219 * terminated, hence try to disconnect from
1223 /* We don't care about D-Bus here, since we'll get an
1224 * asynchronous notification for it anyway. */
1226 if (u->meta.type == UNIT_SERVICE &&
1227 UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1228 !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1230 /* Hmm, if there was no start record written
1231 * write it now, so that we always have a nice
1233 if (!u->meta.in_audit) {
1234 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1236 if (ns == UNIT_INACTIVE)
1237 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1239 /* Write audit record if we have just finished shutting down */
1240 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1242 u->meta.in_audit = false;
1246 /* Maybe we finished startup and are now ready for being
1247 * stopped because unneeded? */
1248 unit_check_unneeded(u);
1250 unit_add_to_dbus_queue(u);
1251 unit_add_to_gc_queue(u);
1254 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1255 struct epoll_event ev;
1260 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1266 if (epoll_ctl(u->meta.manager->epoll_fd,
1267 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1279 void unit_unwatch_fd(Unit *u, Watch *w) {
1283 if (w->type == WATCH_INVALID)
1286 assert(w->type == WATCH_FD);
1287 assert(w->data.unit == u);
1288 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1291 w->type = WATCH_INVALID;
1292 w->data.unit = NULL;
1295 int unit_watch_pid(Unit *u, pid_t pid) {
1299 /* Watch a specific PID. We only support one unit watching
1300 * each PID for now. */
1302 return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1305 void unit_unwatch_pid(Unit *u, pid_t pid) {
1309 hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1312 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1313 struct itimerspec its;
1319 assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1321 /* This will try to reuse the old timer if there is one */
1323 if (w->type == WATCH_UNIT_TIMER) {
1324 assert(w->data.unit == u);
1329 } else if (w->type == WATCH_INVALID) {
1332 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1335 assert_not_reached("Invalid watch type");
1340 /* Set absolute time in the past, but not 0, since we
1341 * don't want to disarm the timer */
1342 its.it_value.tv_sec = 0;
1343 its.it_value.tv_nsec = 1;
1345 flags = TFD_TIMER_ABSTIME;
1347 timespec_store(&its.it_value, delay);
1351 /* This will also flush the elapse counter */
1352 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1355 if (w->type == WATCH_INVALID) {
1356 struct epoll_event ev;
1360 ev.events = EPOLLIN;
1362 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1366 w->type = WATCH_UNIT_TIMER;
1374 close_nointr_nofail(fd);
1379 void unit_unwatch_timer(Unit *u, Watch *w) {
1383 if (w->type == WATCH_INVALID)
1386 assert(w->type == WATCH_UNIT_TIMER);
1387 assert(w->data.unit == u);
1390 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1391 close_nointr_nofail(w->fd);
1394 w->type = WATCH_INVALID;
1395 w->data.unit = NULL;
1398 bool unit_job_is_applicable(Unit *u, JobType j) {
1400 assert(j >= 0 && j < _JOB_TYPE_MAX);
1404 case JOB_VERIFY_ACTIVE:
1410 case JOB_TRY_RESTART:
1411 return unit_can_start(u);
1414 return unit_can_reload(u);
1416 case JOB_RELOAD_OR_START:
1417 return unit_can_reload(u) && unit_can_start(u);
1420 assert_not_reached("Invalid job type");
1424 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1426 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1427 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1428 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1429 [UNIT_WANTS] = UNIT_WANTED_BY,
1430 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1431 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1432 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1433 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1434 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1435 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1436 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1437 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1438 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1439 [UNIT_BEFORE] = UNIT_AFTER,
1440 [UNIT_AFTER] = UNIT_BEFORE,
1441 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1442 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1443 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1445 int r, q = 0, v = 0, w = 0;
1448 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1451 u = unit_follow_merge(u);
1452 other = unit_follow_merge(other);
1454 /* We won't allow dependencies on ourselves. We will not
1455 * consider them an error however. */
1459 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1462 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1463 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1467 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1468 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1471 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1474 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1475 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1480 if (add_reference) {
1481 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1486 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1490 unit_add_to_dbus_queue(u);
1495 set_remove(u->meta.dependencies[d], other);
1498 set_remove(other->meta.dependencies[inverse_table[d]], u);
1501 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1506 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1511 if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1514 if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1520 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1524 assert(name || path);
1527 name = file_name_from_path(path);
1529 if (!unit_name_is_template(name)) {
1534 if (u->meta.instance)
1535 s = unit_name_replace_instance(name, u->meta.instance);
1539 if (!(i = unit_name_to_prefix(u->meta.id)))
1542 s = unit_name_replace_instance(name, i);
1553 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1559 assert(name || path);
1561 if (!(name = resolve_template(u, name, path, &s)))
1564 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1567 r = unit_add_dependency(u, d, other, add_reference);
1574 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1580 assert(name || path);
1582 if (!(name = resolve_template(u, name, path, &s)))
1585 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1588 r = unit_add_two_dependencies(u, d, e, other, add_reference);
1595 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1601 assert(name || path);
1603 if (!(name = resolve_template(u, name, path, &s)))
1606 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1609 r = unit_add_dependency(other, d, u, add_reference);
1616 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1622 assert(name || path);
1624 if (!(name = resolve_template(u, name, path, &s)))
1627 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1630 if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1638 int set_unit_path(const char *p) {
1642 /* This is mostly for debug purposes */
1644 if (path_is_absolute(p)) {
1645 if (!(c = strdup(p)))
1648 if (!(cwd = get_current_dir_name()))
1651 r = asprintf(&c, "%s/%s", cwd, p);
1658 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1667 char *unit_dbus_path(Unit *u) {
1675 if (!(e = bus_path_escape(u->meta.id)))
1678 p = strappend("/org/freedesktop/systemd1/unit/", e);
1684 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1693 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1696 /* Ensure this hasn't been added yet */
1699 if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1702 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1703 LIST_PREPEND(CGroupBonding, by_path, l, b);
1705 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1706 LIST_REMOVE(CGroupBonding, by_path, l, b);
1711 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1717 static char *default_cgroup_path(Unit *u) {
1723 if (u->meta.instance) {
1726 if (!(t = unit_name_template(u->meta.id)))
1729 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1732 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1734 return r < 0 ? NULL : p;
1737 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1738 char *controller = NULL, *path = NULL;
1739 CGroupBonding *b = NULL;
1745 if ((r = cg_split_spec(name, &controller, &path)) < 0)
1749 path = default_cgroup_path(u);
1752 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1754 if (!path || !controller) {
1761 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1766 if (!(b = new0(CGroupBonding, 1))) {
1771 b->controller = controller;
1775 if ((r = unit_add_cgroup(u, b)) < 0)
1788 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1789 CGroupBonding *b = NULL;
1795 controller = SYSTEMD_CGROUP_CONTROLLER;
1797 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1800 if (!(b = new0(CGroupBonding, 1)))
1803 if (!(b->controller = strdup(controller)))
1806 if (!(b->path = default_cgroup_path(u)))
1810 b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1812 if ((r = unit_add_cgroup(u, b)) < 0)
1819 free(b->controller);
1825 int unit_add_default_cgroups(Unit *u) {
1830 /* Adds in the default cgroups, if they weren't specified
1833 if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1836 STRV_FOREACH(c, u->meta.manager->default_controllers)
1837 if ((r = unit_add_one_default_cgroup(u, *c)) < 0)
1843 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1846 return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1849 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1857 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1860 assert(!unit_has_name(u, t));
1862 r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1865 assert(r < 0 || *_found != u);
1870 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1878 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1881 assert(!unit_has_name(u, t));
1883 found = manager_get_unit(u->meta.manager, t);
1893 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1897 return unit_name_to_prefix_and_instance(u->meta.id);
1900 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1904 return unit_name_to_prefix(u->meta.id);
1907 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1913 if (!(p = unit_name_to_prefix(u->meta.id)))
1916 r = unit_name_unescape(p);
1922 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1926 if (u->meta.instance)
1927 return unit_name_unescape(u->meta.instance);
1932 static char *specifier_filename(char specifier, void *data, void *userdata) {
1936 if (u->meta.instance)
1937 return unit_name_path_unescape(u->meta.instance);
1939 return unit_name_to_path(u->meta.instance);
1942 char *unit_name_printf(Unit *u, const char* format) {
1945 * This will use the passed string as format string and
1946 * replace the following specifiers:
1948 * %n: the full id of the unit (foo@bar.waldo)
1949 * %N: the id of the unit without the suffix (foo@bar)
1950 * %p: the prefix (foo)
1951 * %i: the instance (bar)
1954 const Specifier table[] = {
1955 { 'n', specifier_string, u->meta.id },
1956 { 'N', specifier_prefix_and_instance, NULL },
1957 { 'p', specifier_prefix, NULL },
1958 { 'i', specifier_string, u->meta.instance },
1965 return specifier_printf(format, table, u);
1968 char *unit_full_printf(Unit *u, const char *format) {
1970 /* This is similar to unit_name_printf() but also supports
1973 const Specifier table[] = {
1974 { 'n', specifier_string, u->meta.id },
1975 { 'N', specifier_prefix_and_instance, NULL },
1976 { 'p', specifier_prefix, NULL },
1977 { 'P', specifier_prefix_unescaped, NULL },
1978 { 'i', specifier_string, u->meta.instance },
1979 { 'I', specifier_instance_unescaped, NULL },
1980 { 'f', specifier_filename, NULL },
1987 return specifier_printf(format, table, u);
1990 char **unit_full_printf_strv(Unit *u, char **l) {
1994 /* Applies unit_full_printf to every entry in l */
1999 if (!(r = new(char*, n+1)))
2002 for (i = l, j = r; *i; i++, j++)
2003 if (!(*j = unit_full_printf(u, *i)))
2019 int unit_watch_bus_name(Unit *u, const char *name) {
2023 /* Watch a specific name on the bus. We only support one unit
2024 * watching each name for now. */
2026 return hashmap_put(u->meta.manager->watch_bus, name, u);
2029 void unit_unwatch_bus_name(Unit *u, const char *name) {
2033 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2036 bool unit_can_serialize(Unit *u) {
2039 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2042 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2049 if (!unit_can_serialize(u))
2052 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2056 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2058 dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2059 dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2060 dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2061 dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2068 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2079 va_start(ap, format);
2080 vfprintf(f, format, ap);
2086 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2092 fprintf(f, "%s=%s\n", key, value);
2095 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2102 if (!unit_can_serialize(u))
2106 char line[1024], *l, *v;
2109 if (!fgets(line, sizeof(line), f)) {
2122 k = strcspn(l, "=");
2130 if (streq(l, "job")) {
2133 if ((type = job_type_from_string(v)) < 0)
2134 log_debug("Failed to parse job type value %s", v);
2136 u->meta.deserialized_job = type;
2139 } else if (streq(l, "inactive-exit-timestamp")) {
2140 dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2142 } else if (streq(l, "active-enter-timestamp")) {
2143 dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2145 } else if (streq(l, "active-exit-timestamp")) {
2146 dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2148 } else if (streq(l, "inactive-enter-timestamp")) {
2149 dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2153 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2158 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2168 /* Adds in links to the device node that this unit is based on */
2170 if (!is_device_path(what))
2173 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2176 r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2182 if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2186 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2192 int unit_coldplug(Unit *u) {
2197 if (UNIT_VTABLE(u)->coldplug)
2198 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2201 if (u->meta.deserialized_job >= 0) {
2202 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2205 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2211 void unit_status_printf(Unit *u, const char *format, ...) {
2217 if (!UNIT_VTABLE(u)->show_status)
2220 if (u->meta.manager->running_as != MANAGER_SYSTEM)
2223 if (!u->meta.manager->show_status)
2226 if (!manager_is_booting_or_shutting_down(u->meta.manager))
2229 va_start(ap, format);
2230 status_vprintf(format, ap);
2234 bool unit_need_daemon_reload(Unit *u) {
2239 if (!u->meta.fragment_path)
2243 if (stat(u->meta.fragment_path, &st) < 0)
2244 /* What, cannot access this anymore? */
2248 u->meta.fragment_mtime &&
2249 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2252 void unit_reset_failed(Unit *u) {
2255 if (UNIT_VTABLE(u)->reset_failed)
2256 UNIT_VTABLE(u)->reset_failed(u);
2259 Unit *unit_following(Unit *u) {
2262 if (UNIT_VTABLE(u)->following)
2263 return UNIT_VTABLE(u)->following(u);
2268 bool unit_pending_inactive(Unit *u) {
2271 /* Returns true if the unit is inactive or going down */
2273 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2276 if (u->meta.job && u->meta.job->type == JOB_STOP)
2282 bool unit_pending_active(Unit *u) {
2285 /* Returns true if the unit is inactive or going down */
2287 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2291 (u->meta.job->type == JOB_START ||
2292 u->meta.job->type == JOB_RELOAD_OR_START ||
2293 u->meta.job->type == JOB_RESTART))
2299 UnitType unit_name_to_type(const char *n) {
2304 for (t = 0; t < _UNIT_TYPE_MAX; t++)
2305 if (endswith(n, unit_vtable[t]->suffix))
2308 return _UNIT_TYPE_INVALID;
2311 bool unit_name_is_valid(const char *n, bool template_ok) {
2314 t = unit_name_to_type(n);
2315 if (t < 0 || t >= _UNIT_TYPE_MAX)
2318 return unit_name_is_valid_no_type(n, template_ok);
2321 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2323 assert(w >= 0 && w < _KILL_WHO_MAX);
2324 assert(m >= 0 && m < _KILL_MODE_MAX);
2326 assert(signo < _NSIG);
2331 if (!UNIT_VTABLE(u)->kill)
2334 return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2338 int unit_following_set(Unit *u, Set **s) {
2342 if (UNIT_VTABLE(u)->following_set)
2343 return UNIT_VTABLE(u)->following_set(u, s);
2349 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2350 [UNIT_STUB] = "stub",
2351 [UNIT_LOADED] = "loaded",
2352 [UNIT_ERROR] = "error",
2353 [UNIT_MERGED] = "merged",
2354 [UNIT_MASKED] = "masked"
2357 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2359 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2360 [UNIT_ACTIVE] = "active",
2361 [UNIT_RELOADING] = "reloading",
2362 [UNIT_INACTIVE] = "inactive",
2363 [UNIT_FAILED] = "failed",
2364 [UNIT_ACTIVATING] = "activating",
2365 [UNIT_DEACTIVATING] = "deactivating"
2368 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2370 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2371 [UNIT_REQUIRES] = "Requires",
2372 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2373 [UNIT_WANTS] = "Wants",
2374 [UNIT_REQUISITE] = "Requisite",
2375 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2376 [UNIT_REQUIRED_BY] = "RequiredBy",
2377 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2378 [UNIT_BIND_TO] = "BindTo",
2379 [UNIT_WANTED_BY] = "WantedBy",
2380 [UNIT_CONFLICTS] = "Conflicts",
2381 [UNIT_CONFLICTED_BY] = "ConflictedBy",
2382 [UNIT_BOUND_BY] = "BoundBy",
2383 [UNIT_BEFORE] = "Before",
2384 [UNIT_AFTER] = "After",
2385 [UNIT_REFERENCES] = "References",
2386 [UNIT_REFERENCED_BY] = "ReferencedBy",
2387 [UNIT_ON_FAILURE] = "OnFailure"
2390 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);