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_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
560 c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
561 c->std_error != EXEC_OUTPUT_KMSG &&
562 c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
563 c->std_error != EXEC_OUTPUT_KMSG &&
564 c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
567 /* If syslog or kernel logging is requested, make sure our own
568 * logging daemon is run first. */
570 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
573 if (u->meta.manager->running_as == MANAGER_SYSTEM)
574 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
580 const char *unit_description(Unit *u) {
583 if (u->meta.description)
584 return u->meta.description;
586 return strna(u->meta.id);
589 void unit_dump(Unit *u, FILE *f, const char *prefix) {
597 timestamp1[FORMAT_TIMESTAMP_MAX],
598 timestamp2[FORMAT_TIMESTAMP_MAX],
599 timestamp3[FORMAT_TIMESTAMP_MAX],
600 timestamp4[FORMAT_TIMESTAMP_MAX],
601 timespan[FORMAT_TIMESPAN_MAX];
605 assert(u->meta.type >= 0);
609 p2 = strappend(prefix, "\t");
610 prefix2 = p2 ? p2 : prefix;
614 "%s\tDescription: %s\n"
616 "%s\tUnit Load State: %s\n"
617 "%s\tUnit Active State: %s\n"
618 "%s\tInactive Exit Timestamp: %s\n"
619 "%s\tActive Enter Timestamp: %s\n"
620 "%s\tActive Exit Timestamp: %s\n"
621 "%s\tInactive Enter Timestamp: %s\n"
622 "%s\tGC Check Good: %s\n"
623 "%s\tNeed Daemon Reload: %s\n",
625 prefix, unit_description(u),
626 prefix, strna(u->meta.instance),
627 prefix, unit_load_state_to_string(u->meta.load_state),
628 prefix, unit_active_state_to_string(unit_active_state(u)),
629 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
630 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
631 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
632 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
633 prefix, yes_no(unit_check_gc(u)),
634 prefix, yes_no(unit_need_daemon_reload(u)));
636 SET_FOREACH(t, u->meta.names, i)
637 fprintf(f, "%s\tName: %s\n", prefix, t);
639 if ((following = unit_following(u)))
640 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
642 if (u->meta.fragment_path)
643 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
645 if (u->meta.job_timeout > 0)
646 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
648 condition_dump_list(u->meta.conditions, f, prefix);
650 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
653 SET_FOREACH(other, u->meta.dependencies[d], i)
654 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
657 if (u->meta.load_state == UNIT_LOADED) {
659 "%s\tStopWhenUnneeded: %s\n"
660 "%s\tRefuseManualStart: %s\n"
661 "%s\tRefuseManualStop: %s\n"
662 "%s\tDefaultDependencies: %s\n",
663 prefix, yes_no(u->meta.stop_when_unneeded),
664 prefix, yes_no(u->meta.refuse_manual_start),
665 prefix, yes_no(u->meta.refuse_manual_stop),
666 prefix, yes_no(u->meta.default_dependencies));
668 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
669 fprintf(f, "%s\tControlGroup: %s:%s\n",
670 prefix, b->controller, b->path);
672 if (UNIT_VTABLE(u)->dump)
673 UNIT_VTABLE(u)->dump(u, f, prefix2);
675 } else if (u->meta.load_state == UNIT_MERGED)
677 "%s\tMerged into: %s\n",
678 prefix, u->meta.merged_into->meta.id);
679 else if (u->meta.load_state == UNIT_ERROR)
680 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
684 job_dump(u->meta.job, f, prefix2);
689 /* Common implementation for multiple backends */
690 int unit_load_fragment_and_dropin(Unit *u) {
695 /* Load a .service file */
696 if ((r = unit_load_fragment(u)) < 0)
699 if (u->meta.load_state == UNIT_STUB)
702 /* Load drop-in directory data */
703 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
709 /* Common implementation for multiple backends */
710 int unit_load_fragment_and_dropin_optional(Unit *u) {
715 /* Same as unit_load_fragment_and_dropin(), but whether
716 * something can be loaded or not doesn't matter. */
718 /* Load a .service file */
719 if ((r = unit_load_fragment(u)) < 0)
722 if (u->meta.load_state == UNIT_STUB)
723 u->meta.load_state = UNIT_LOADED;
725 /* Load drop-in directory data */
726 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
732 int unit_add_default_target_dependency(Unit *u, Unit *target) {
736 if (target->meta.type != UNIT_TARGET)
739 /* Only add the dependency if both units are loaded, so that
740 * that loop check below is reliable */
741 if (u->meta.load_state != UNIT_LOADED ||
742 target->meta.load_state != UNIT_LOADED)
745 /* If either side wants no automatic dependencies, then let's
747 if (!u->meta.default_dependencies ||
748 target->meta.default_dependencies)
751 /* Don't create loops */
752 if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
755 return unit_add_dependency(target, UNIT_AFTER, u, true);
758 static int unit_add_default_dependencies(Unit *u) {
759 static const UnitDependency deps[] = {
761 UNIT_REQUIRED_BY_OVERRIDABLE,
773 for (k = 0; k < ELEMENTSOF(deps); k++)
774 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
775 if ((r = unit_add_default_target_dependency(u, target)) < 0)
781 int unit_load(Unit *u) {
786 if (u->meta.in_load_queue) {
787 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
788 u->meta.in_load_queue = false;
791 if (u->meta.type == _UNIT_TYPE_INVALID)
794 if (u->meta.load_state != UNIT_STUB)
797 if (UNIT_VTABLE(u)->load)
798 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
801 if (u->meta.load_state == UNIT_STUB) {
806 if (u->meta.load_state == UNIT_LOADED &&
807 u->meta.default_dependencies)
808 if ((r = unit_add_default_dependencies(u)) < 0)
811 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
813 unit_add_to_dbus_queue(unit_follow_merge(u));
814 unit_add_to_gc_queue(u);
819 u->meta.load_state = UNIT_ERROR;
820 u->meta.load_error = r;
821 unit_add_to_dbus_queue(u);
823 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
828 bool unit_condition_test(Unit *u) {
831 dual_timestamp_get(&u->meta.condition_timestamp);
832 u->meta.condition_result = condition_test_list(u->meta.conditions);
834 return u->meta.condition_result;
838 * -EBADR: This unit type does not support starting.
839 * -EALREADY: Unit is already started.
840 * -EAGAIN: An operation is already in progress. Retry later.
841 * -ECANCELED: Too many requests for now.
843 int unit_start(Unit *u) {
844 UnitActiveState state;
849 if (u->meta.load_state != UNIT_LOADED)
852 /* If this is already (being) started, then this will
853 * succeed. Note that this will even succeed if this unit is
854 * not startable by the user. This is relied on to detect when
855 * we need to wait for units and when waiting is finished. */
856 state = unit_active_state(u);
857 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
860 /* If the conditions failed, don't do anything at all */
861 if (!unit_condition_test(u)) {
862 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
866 /* Forward to the main object, if we aren't it. */
867 if ((following = unit_following(u))) {
868 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
869 return unit_start(following);
872 /* If it is stopped, but we cannot start it, then fail */
873 if (!UNIT_VTABLE(u)->start)
876 /* We don't suppress calls to ->start() here when we are
877 * already starting, to allow this request to be used as a
878 * "hurry up" call, for example when the unit is in some "auto
879 * restart" state where it waits for a holdoff timer to elapse
880 * before it will start again. */
882 unit_add_to_dbus_queue(u);
884 unit_status_printf(u, "Starting %s...\n", unit_description(u));
885 return UNIT_VTABLE(u)->start(u);
888 bool unit_can_start(Unit *u) {
891 return !!UNIT_VTABLE(u)->start;
894 bool unit_can_isolate(Unit *u) {
897 return unit_can_start(u) &&
898 u->meta.allow_isolate;
902 * -EBADR: This unit type does not support stopping.
903 * -EALREADY: Unit is already stopped.
904 * -EAGAIN: An operation is already in progress. Retry later.
906 int unit_stop(Unit *u) {
907 UnitActiveState state;
912 state = unit_active_state(u);
913 if (UNIT_IS_INACTIVE_OR_FAILED(state))
916 if ((following = unit_following(u))) {
917 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
918 return unit_stop(following);
921 if (!UNIT_VTABLE(u)->stop)
924 unit_add_to_dbus_queue(u);
926 unit_status_printf(u, "Stopping %s...\n", unit_description(u));
927 return UNIT_VTABLE(u)->stop(u);
931 * -EBADR: This unit type does not support reloading.
932 * -ENOEXEC: Unit is not started.
933 * -EAGAIN: An operation is already in progress. Retry later.
935 int unit_reload(Unit *u) {
936 UnitActiveState state;
941 if (u->meta.load_state != UNIT_LOADED)
944 if (!unit_can_reload(u))
947 state = unit_active_state(u);
948 if (state == UNIT_RELOADING)
951 if (state != UNIT_ACTIVE)
954 if ((following = unit_following(u))) {
955 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
956 return unit_reload(following);
959 unit_add_to_dbus_queue(u);
960 return UNIT_VTABLE(u)->reload(u);
963 bool unit_can_reload(Unit *u) {
966 if (!UNIT_VTABLE(u)->reload)
969 if (!UNIT_VTABLE(u)->can_reload)
972 return UNIT_VTABLE(u)->can_reload(u);
975 static void unit_check_unneeded(Unit *u) {
981 /* If this service shall be shut down when unneeded then do
984 if (!u->meta.stop_when_unneeded)
987 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
990 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
991 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
994 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
995 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
998 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
999 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1002 SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1003 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1006 log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
1008 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1009 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1012 static void retroactively_start_dependencies(Unit *u) {
1017 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1019 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1020 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1021 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1022 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1024 SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1025 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1026 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1027 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1029 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1030 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1031 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1032 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1034 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1035 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1036 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1037 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1039 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1040 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1041 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1042 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1044 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1045 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1046 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1048 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1049 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1050 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1053 static void retroactively_stop_dependencies(Unit *u) {
1058 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1060 /* Pull down units which are bound to us recursively if enabled */
1061 SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1062 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1063 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1065 /* Garbage collect services that might not be needed anymore, if enabled */
1066 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1067 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1068 unit_check_unneeded(other);
1069 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1070 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1071 unit_check_unneeded(other);
1072 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1073 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1074 unit_check_unneeded(other);
1075 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1076 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1077 unit_check_unneeded(other);
1078 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1079 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1080 unit_check_unneeded(other);
1081 SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1082 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1083 unit_check_unneeded(other);
1086 void unit_trigger_on_failure(Unit *u) {
1092 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1093 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1096 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1101 assert(os < _UNIT_ACTIVE_STATE_MAX);
1102 assert(ns < _UNIT_ACTIVE_STATE_MAX);
1104 /* Note that this is called for all low-level state changes,
1105 * even if they might map to the same high-level
1106 * UnitActiveState! That means that ns == os is OK an expected
1107 * behaviour here. For example: if a mount point is remounted
1108 * this function will be called too! */
1110 dual_timestamp_get(&ts);
1112 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1113 u->meta.inactive_exit_timestamp = ts;
1114 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1115 u->meta.inactive_enter_timestamp = ts;
1117 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1118 u->meta.active_enter_timestamp = ts;
1119 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1120 u->meta.active_exit_timestamp = ts;
1122 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1123 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1125 timer_unit_notify(u, ns);
1126 path_unit_notify(u, ns);
1131 if (u->meta.job->state == JOB_WAITING)
1133 /* So we reached a different state for this
1134 * job. Let's see if we can run it now if it
1135 * failed previously due to EAGAIN. */
1136 job_add_to_run_queue(u->meta.job);
1138 /* Let's check whether this state change constitutes a
1139 * finished job, or maybe contradicts a running job and
1140 * hence needs to invalidate jobs. */
1142 switch (u->meta.job->type) {
1145 case JOB_VERIFY_ACTIVE:
1147 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1148 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1149 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1152 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1153 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1159 case JOB_RELOAD_OR_START:
1161 if (u->meta.job->state == JOB_RUNNING) {
1162 if (ns == UNIT_ACTIVE)
1163 job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1164 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1167 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1168 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1176 case JOB_TRY_RESTART:
1178 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1179 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1180 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1182 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1188 assert_not_reached("Job type unknown");
1194 /* If this state change happened without being requested by a
1195 * job, then let's retroactively start or stop
1196 * dependencies. We skip that step when deserializing, since
1197 * we don't want to create any additional jobs just because
1198 * something is already activated. */
1200 if (unexpected && u->meta.manager->n_deserializing <= 0) {
1201 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1202 retroactively_start_dependencies(u);
1203 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1204 retroactively_stop_dependencies(u);
1207 if (ns != os && ns == UNIT_FAILED) {
1208 log_notice("Unit %s entered failed state.", u->meta.id);
1209 unit_trigger_on_failure(u);
1212 /* Some names are special */
1213 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1214 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1215 /* The bus just might have become available,
1216 * hence try to connect to it, if we aren't
1218 bus_init(u->meta.manager, true);
1220 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1221 /* The syslog daemon just might have become
1222 * available, hence try to connect to it, if
1223 * we aren't yet connected. */
1226 if (u->meta.type == UNIT_SERVICE &&
1227 !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1228 /* Write audit record if we have just finished starting up */
1229 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1230 u->meta.in_audit = true;
1233 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1234 manager_send_unit_plymouth(u->meta.manager, u);
1238 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1239 /* The syslog daemon might just have
1240 * terminated, hence try to disconnect from
1244 /* We don't care about D-Bus here, since we'll get an
1245 * asynchronous notification for it anyway. */
1247 if (u->meta.type == UNIT_SERVICE &&
1248 UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1249 !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1251 /* Hmm, if there was no start record written
1252 * write it now, so that we always have a nice
1254 if (!u->meta.in_audit) {
1255 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1257 if (ns == UNIT_INACTIVE)
1258 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1260 /* Write audit record if we have just finished shutting down */
1261 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1263 u->meta.in_audit = false;
1267 /* Maybe we finished startup and are now ready for being
1268 * stopped because unneeded? */
1269 unit_check_unneeded(u);
1271 unit_add_to_dbus_queue(u);
1272 unit_add_to_gc_queue(u);
1275 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1276 struct epoll_event ev;
1281 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1287 if (epoll_ctl(u->meta.manager->epoll_fd,
1288 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1300 void unit_unwatch_fd(Unit *u, Watch *w) {
1304 if (w->type == WATCH_INVALID)
1307 assert(w->type == WATCH_FD);
1308 assert(w->data.unit == u);
1309 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1312 w->type = WATCH_INVALID;
1313 w->data.unit = NULL;
1316 int unit_watch_pid(Unit *u, pid_t pid) {
1320 /* Watch a specific PID. We only support one unit watching
1321 * each PID for now. */
1323 return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1326 void unit_unwatch_pid(Unit *u, pid_t pid) {
1330 hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1333 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1334 struct itimerspec its;
1340 assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1342 /* This will try to reuse the old timer if there is one */
1344 if (w->type == WATCH_UNIT_TIMER) {
1345 assert(w->data.unit == u);
1350 } else if (w->type == WATCH_INVALID) {
1353 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1356 assert_not_reached("Invalid watch type");
1361 /* Set absolute time in the past, but not 0, since we
1362 * don't want to disarm the timer */
1363 its.it_value.tv_sec = 0;
1364 its.it_value.tv_nsec = 1;
1366 flags = TFD_TIMER_ABSTIME;
1368 timespec_store(&its.it_value, delay);
1372 /* This will also flush the elapse counter */
1373 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1376 if (w->type == WATCH_INVALID) {
1377 struct epoll_event ev;
1381 ev.events = EPOLLIN;
1383 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1387 w->type = WATCH_UNIT_TIMER;
1395 close_nointr_nofail(fd);
1400 void unit_unwatch_timer(Unit *u, Watch *w) {
1404 if (w->type == WATCH_INVALID)
1407 assert(w->type == WATCH_UNIT_TIMER);
1408 assert(w->data.unit == u);
1411 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1412 close_nointr_nofail(w->fd);
1415 w->type = WATCH_INVALID;
1416 w->data.unit = NULL;
1419 bool unit_job_is_applicable(Unit *u, JobType j) {
1421 assert(j >= 0 && j < _JOB_TYPE_MAX);
1425 case JOB_VERIFY_ACTIVE:
1431 case JOB_TRY_RESTART:
1432 return unit_can_start(u);
1435 return unit_can_reload(u);
1437 case JOB_RELOAD_OR_START:
1438 return unit_can_reload(u) && unit_can_start(u);
1441 assert_not_reached("Invalid job type");
1445 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1447 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1448 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1449 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1450 [UNIT_WANTS] = UNIT_WANTED_BY,
1451 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1452 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1453 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1454 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1455 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1456 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1457 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1458 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1459 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1460 [UNIT_BEFORE] = UNIT_AFTER,
1461 [UNIT_AFTER] = UNIT_BEFORE,
1462 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1463 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1464 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1466 int r, q = 0, v = 0, w = 0;
1469 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1472 u = unit_follow_merge(u);
1473 other = unit_follow_merge(other);
1475 /* We won't allow dependencies on ourselves. We will not
1476 * consider them an error however. */
1480 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1483 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1484 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1488 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1489 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1492 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1495 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1496 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1501 if (add_reference) {
1502 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1507 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1511 unit_add_to_dbus_queue(u);
1516 set_remove(u->meta.dependencies[d], other);
1519 set_remove(other->meta.dependencies[inverse_table[d]], u);
1522 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1527 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1532 if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1535 if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1541 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1545 assert(name || path);
1548 name = file_name_from_path(path);
1550 if (!unit_name_is_template(name)) {
1555 if (u->meta.instance)
1556 s = unit_name_replace_instance(name, u->meta.instance);
1560 if (!(i = unit_name_to_prefix(u->meta.id)))
1563 s = unit_name_replace_instance(name, i);
1574 int unit_add_dependency_by_name(Unit *u, UnitDependency d, 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_dependency(u, d, other, add_reference);
1595 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, 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_two_dependencies(u, d, e, other, add_reference);
1616 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, 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 r = unit_add_dependency(other, d, u, add_reference);
1637 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1643 assert(name || path);
1645 if (!(name = resolve_template(u, name, path, &s)))
1648 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1651 if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1659 int set_unit_path(const char *p) {
1663 /* This is mostly for debug purposes */
1665 if (path_is_absolute(p)) {
1666 if (!(c = strdup(p)))
1669 if (!(cwd = get_current_dir_name()))
1672 r = asprintf(&c, "%s/%s", cwd, p);
1679 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1688 char *unit_dbus_path(Unit *u) {
1696 if (!(e = bus_path_escape(u->meta.id)))
1699 p = strappend("/org/freedesktop/systemd1/unit/", e);
1705 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1714 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1717 /* Ensure this hasn't been added yet */
1720 if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1723 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1724 LIST_PREPEND(CGroupBonding, by_path, l, b);
1726 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1727 LIST_REMOVE(CGroupBonding, by_path, l, b);
1732 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1738 static char *default_cgroup_path(Unit *u) {
1744 if (u->meta.instance) {
1747 if (!(t = unit_name_template(u->meta.id)))
1750 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1753 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1755 return r < 0 ? NULL : p;
1758 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1759 char *controller = NULL, *path = NULL;
1760 CGroupBonding *b = NULL;
1766 if ((r = cg_split_spec(name, &controller, &path)) < 0)
1770 path = default_cgroup_path(u);
1773 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1775 if (!path || !controller) {
1782 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1787 if (!(b = new0(CGroupBonding, 1))) {
1792 b->controller = controller;
1796 if ((r = unit_add_cgroup(u, b)) < 0)
1809 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1810 CGroupBonding *b = NULL;
1816 controller = SYSTEMD_CGROUP_CONTROLLER;
1818 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1821 if (!(b = new0(CGroupBonding, 1)))
1824 if (!(b->controller = strdup(controller)))
1827 if (!(b->path = default_cgroup_path(u)))
1831 b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1833 if ((r = unit_add_cgroup(u, b)) < 0)
1840 free(b->controller);
1846 int unit_add_default_cgroups(Unit *u) {
1851 /* Adds in the default cgroups, if they weren't specified
1854 if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1857 STRV_FOREACH(c, u->meta.manager->default_controllers)
1858 if ((r = unit_add_one_default_cgroup(u, *c)) < 0)
1864 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1867 return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1870 int unit_load_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 r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1886 assert(r < 0 || *_found != u);
1891 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1899 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1902 assert(!unit_has_name(u, t));
1904 found = manager_get_unit(u->meta.manager, t);
1914 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1918 return unit_name_to_prefix_and_instance(u->meta.id);
1921 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1925 return unit_name_to_prefix(u->meta.id);
1928 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1934 if (!(p = unit_name_to_prefix(u->meta.id)))
1937 r = unit_name_unescape(p);
1943 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1947 if (u->meta.instance)
1948 return unit_name_unescape(u->meta.instance);
1953 static char *specifier_filename(char specifier, void *data, void *userdata) {
1957 if (u->meta.instance)
1958 return unit_name_path_unescape(u->meta.instance);
1960 return unit_name_to_path(u->meta.instance);
1963 char *unit_name_printf(Unit *u, const char* format) {
1966 * This will use the passed string as format string and
1967 * replace the following specifiers:
1969 * %n: the full id of the unit (foo@bar.waldo)
1970 * %N: the id of the unit without the suffix (foo@bar)
1971 * %p: the prefix (foo)
1972 * %i: the instance (bar)
1975 const Specifier table[] = {
1976 { 'n', specifier_string, u->meta.id },
1977 { 'N', specifier_prefix_and_instance, NULL },
1978 { 'p', specifier_prefix, NULL },
1979 { 'i', specifier_string, u->meta.instance },
1986 return specifier_printf(format, table, u);
1989 char *unit_full_printf(Unit *u, const char *format) {
1991 /* This is similar to unit_name_printf() but also supports
1994 const Specifier table[] = {
1995 { 'n', specifier_string, u->meta.id },
1996 { 'N', specifier_prefix_and_instance, NULL },
1997 { 'p', specifier_prefix, NULL },
1998 { 'P', specifier_prefix_unescaped, NULL },
1999 { 'i', specifier_string, u->meta.instance },
2000 { 'I', specifier_instance_unescaped, NULL },
2001 { 'f', specifier_filename, NULL },
2008 return specifier_printf(format, table, u);
2011 char **unit_full_printf_strv(Unit *u, char **l) {
2015 /* Applies unit_full_printf to every entry in l */
2020 if (!(r = new(char*, n+1)))
2023 for (i = l, j = r; *i; i++, j++)
2024 if (!(*j = unit_full_printf(u, *i)))
2040 int unit_watch_bus_name(Unit *u, const char *name) {
2044 /* Watch a specific name on the bus. We only support one unit
2045 * watching each name for now. */
2047 return hashmap_put(u->meta.manager->watch_bus, name, u);
2050 void unit_unwatch_bus_name(Unit *u, const char *name) {
2054 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2057 bool unit_can_serialize(Unit *u) {
2060 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2063 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2070 if (!unit_can_serialize(u))
2073 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2077 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2079 dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2080 dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2081 dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2082 dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2089 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2100 va_start(ap, format);
2101 vfprintf(f, format, ap);
2107 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2113 fprintf(f, "%s=%s\n", key, value);
2116 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2123 if (!unit_can_serialize(u))
2127 char line[1024], *l, *v;
2130 if (!fgets(line, sizeof(line), f)) {
2143 k = strcspn(l, "=");
2151 if (streq(l, "job")) {
2154 if ((type = job_type_from_string(v)) < 0)
2155 log_debug("Failed to parse job type value %s", v);
2157 u->meta.deserialized_job = type;
2160 } else if (streq(l, "inactive-exit-timestamp")) {
2161 dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2163 } else if (streq(l, "active-enter-timestamp")) {
2164 dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2166 } else if (streq(l, "active-exit-timestamp")) {
2167 dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2169 } else if (streq(l, "inactive-enter-timestamp")) {
2170 dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2174 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2179 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2189 /* Adds in links to the device node that this unit is based on */
2191 if (!is_device_path(what))
2194 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2197 r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2203 if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2207 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2213 int unit_coldplug(Unit *u) {
2218 if (UNIT_VTABLE(u)->coldplug)
2219 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2222 if (u->meta.deserialized_job >= 0) {
2223 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2226 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2232 void unit_status_printf(Unit *u, const char *format, ...) {
2238 if (!UNIT_VTABLE(u)->show_status)
2241 if (u->meta.manager->running_as != MANAGER_SYSTEM)
2244 if (!u->meta.manager->show_status)
2247 if (!manager_is_booting_or_shutting_down(u->meta.manager))
2250 va_start(ap, format);
2251 status_vprintf(format, ap);
2255 bool unit_need_daemon_reload(Unit *u) {
2260 if (!u->meta.fragment_path)
2264 if (stat(u->meta.fragment_path, &st) < 0)
2265 /* What, cannot access this anymore? */
2269 u->meta.fragment_mtime &&
2270 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2273 void unit_reset_failed(Unit *u) {
2276 if (UNIT_VTABLE(u)->reset_failed)
2277 UNIT_VTABLE(u)->reset_failed(u);
2280 Unit *unit_following(Unit *u) {
2283 if (UNIT_VTABLE(u)->following)
2284 return UNIT_VTABLE(u)->following(u);
2289 bool unit_pending_inactive(Unit *u) {
2292 /* Returns true if the unit is inactive or going down */
2294 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2297 if (u->meta.job && u->meta.job->type == JOB_STOP)
2303 bool unit_pending_active(Unit *u) {
2306 /* Returns true if the unit is inactive or going down */
2308 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2312 (u->meta.job->type == JOB_START ||
2313 u->meta.job->type == JOB_RELOAD_OR_START ||
2314 u->meta.job->type == JOB_RESTART))
2320 UnitType unit_name_to_type(const char *n) {
2325 for (t = 0; t < _UNIT_TYPE_MAX; t++)
2326 if (endswith(n, unit_vtable[t]->suffix))
2329 return _UNIT_TYPE_INVALID;
2332 bool unit_name_is_valid(const char *n, bool template_ok) {
2335 t = unit_name_to_type(n);
2336 if (t < 0 || t >= _UNIT_TYPE_MAX)
2339 return unit_name_is_valid_no_type(n, template_ok);
2342 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2344 assert(w >= 0 && w < _KILL_WHO_MAX);
2345 assert(m >= 0 && m < _KILL_MODE_MAX);
2347 assert(signo < _NSIG);
2352 if (!UNIT_VTABLE(u)->kill)
2355 return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2359 int unit_following_set(Unit *u, Set **s) {
2363 if (UNIT_VTABLE(u)->following_set)
2364 return UNIT_VTABLE(u)->following_set(u, s);
2370 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2371 [UNIT_STUB] = "stub",
2372 [UNIT_LOADED] = "loaded",
2373 [UNIT_ERROR] = "error",
2374 [UNIT_MERGED] = "merged",
2375 [UNIT_MASKED] = "masked"
2378 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2380 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2381 [UNIT_ACTIVE] = "active",
2382 [UNIT_RELOADING] = "reloading",
2383 [UNIT_INACTIVE] = "inactive",
2384 [UNIT_FAILED] = "failed",
2385 [UNIT_ACTIVATING] = "activating",
2386 [UNIT_DEACTIVATING] = "deactivating"
2389 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2391 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2392 [UNIT_REQUIRES] = "Requires",
2393 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2394 [UNIT_WANTS] = "Wants",
2395 [UNIT_REQUISITE] = "Requisite",
2396 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2397 [UNIT_REQUIRED_BY] = "RequiredBy",
2398 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2399 [UNIT_BIND_TO] = "BindTo",
2400 [UNIT_WANTED_BY] = "WantedBy",
2401 [UNIT_CONFLICTS] = "Conflicts",
2402 [UNIT_CONFLICTED_BY] = "ConflictedBy",
2403 [UNIT_BOUND_BY] = "BoundBy",
2404 [UNIT_BEFORE] = "Before",
2405 [UNIT_AFTER] = "After",
2406 [UNIT_REFERENCES] = "References",
2407 [UNIT_REFERENCED_BY] = "ReferencedBy",
2408 [UNIT_ON_FAILURE] = "OnFailure"
2411 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);