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) {
126 /* Ensure that this unit is either instanced or not instanced,
128 if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
133 if (unit_vtable[t]->no_alias &&
134 !set_isempty(u->meta.names) &&
135 !set_get(u->meta.names, s)) {
140 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
145 if ((r = set_put(u->meta.names, s)) < 0) {
151 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
152 set_remove(u->meta.names, s);
156 if (u->meta.type == _UNIT_TYPE_INVALID) {
160 u->meta.instance = i;
162 LIST_PREPEND(Meta, units_by_type, u->meta.manager->units_by_type[t], &u->meta);
164 if (UNIT_VTABLE(u)->init)
165 UNIT_VTABLE(u)->init(u);
169 unit_add_to_dbus_queue(u);
179 int unit_choose_id(Unit *u, const char *name) {
180 char *s, *t = NULL, *i;
186 if (unit_name_is_template(name)) {
188 if (!u->meta.instance)
191 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
197 /* Selects one of the names of this unit as the id */
198 s = set_get(u->meta.names, (char*) name);
204 if ((r = unit_name_to_instance(s, &i)) < 0)
209 free(u->meta.instance);
210 u->meta.instance = i;
212 unit_add_to_dbus_queue(u);
217 int unit_set_description(Unit *u, const char *description) {
222 if (!(s = strdup(description)))
225 free(u->meta.description);
226 u->meta.description = s;
228 unit_add_to_dbus_queue(u);
232 bool unit_check_gc(Unit *u) {
235 if (u->meta.load_state == UNIT_STUB)
238 if (UNIT_VTABLE(u)->no_gc)
247 if (unit_active_state(u) != UNIT_INACTIVE)
250 if (UNIT_VTABLE(u)->check_gc)
251 if (UNIT_VTABLE(u)->check_gc(u))
257 void unit_add_to_load_queue(Unit *u) {
259 assert(u->meta.type != _UNIT_TYPE_INVALID);
261 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
264 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
265 u->meta.in_load_queue = true;
268 void unit_add_to_cleanup_queue(Unit *u) {
271 if (u->meta.in_cleanup_queue)
274 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
275 u->meta.in_cleanup_queue = true;
278 void unit_add_to_gc_queue(Unit *u) {
281 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
284 if (unit_check_gc(u))
287 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
288 u->meta.in_gc_queue = true;
290 u->meta.manager->n_in_gc_queue ++;
292 if (u->meta.manager->gc_queue_timestamp <= 0)
293 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
296 void unit_add_to_dbus_queue(Unit *u) {
298 assert(u->meta.type != _UNIT_TYPE_INVALID);
300 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
303 /* Shortcut things if nobody cares */
304 if (!bus_has_subscriber(u->meta.manager)) {
305 u->meta.sent_dbus_new_signal = true;
309 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
310 u->meta.in_dbus_queue = true;
313 static void bidi_set_free(Unit *u, Set *s) {
319 /* Frees the set and makes sure we are dropped from the
320 * inverse pointers */
322 SET_FOREACH(other, s, i) {
325 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
326 set_remove(other->meta.dependencies[d], u);
328 unit_add_to_gc_queue(other);
334 void unit_free(Unit *u) {
341 bus_unit_send_removed_signal(u);
343 if (u->meta.load_state != UNIT_STUB)
344 if (UNIT_VTABLE(u)->done)
345 UNIT_VTABLE(u)->done(u);
347 SET_FOREACH(t, u->meta.names, i)
348 hashmap_remove_value(u->meta.manager->units, t, u);
351 job_free(u->meta.job);
353 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
354 bidi_set_free(u, u->meta.dependencies[d]);
356 if (u->meta.type != _UNIT_TYPE_INVALID)
357 LIST_REMOVE(Meta, units_by_type, u->meta.manager->units_by_type[u->meta.type], &u->meta);
359 if (u->meta.in_load_queue)
360 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
362 if (u->meta.in_dbus_queue)
363 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
365 if (u->meta.in_cleanup_queue)
366 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
368 if (u->meta.in_gc_queue) {
369 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
370 u->meta.manager->n_in_gc_queue--;
373 cgroup_bonding_free_list(u->meta.cgroup_bondings, u->meta.manager->n_serializing <= 0);
375 free(u->meta.description);
376 free(u->meta.fragment_path);
378 set_free_free(u->meta.names);
380 condition_free_list(u->meta.conditions);
382 free(u->meta.instance);
386 UnitActiveState unit_active_state(Unit *u) {
389 if (u->meta.load_state == UNIT_MERGED)
390 return unit_active_state(unit_follow_merge(u));
392 /* After a reload it might happen that a unit is not correctly
393 * loaded but still has a process around. That's why we won't
394 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
396 return UNIT_VTABLE(u)->active_state(u);
399 const char* unit_sub_state_to_string(Unit *u) {
402 return UNIT_VTABLE(u)->sub_state_to_string(u);
405 static void complete_move(Set **s, Set **other) {
413 set_move(*s, *other);
420 static void merge_names(Unit *u, Unit *other) {
427 complete_move(&u->meta.names, &other->meta.names);
429 set_free_free(other->meta.names);
430 other->meta.names = NULL;
431 other->meta.id = NULL;
433 SET_FOREACH(t, u->meta.names, i)
434 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
437 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
444 assert(d < _UNIT_DEPENDENCY_MAX);
446 /* Fix backwards pointers */
447 SET_FOREACH(back, other->meta.dependencies[d], i) {
450 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
451 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
454 set_remove(back->meta.dependencies[k], other);
456 assert(r == -ENOENT);
460 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
462 set_free(other->meta.dependencies[d]);
463 other->meta.dependencies[d] = NULL;
466 int unit_merge(Unit *u, Unit *other) {
471 assert(u->meta.manager == other->meta.manager);
472 assert(u->meta.type != _UNIT_TYPE_INVALID);
474 other = unit_follow_merge(other);
479 if (u->meta.type != other->meta.type)
482 if (!u->meta.instance != !other->meta.instance)
485 if (other->meta.load_state != UNIT_STUB &&
486 other->meta.load_state != UNIT_ERROR)
492 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
496 merge_names(u, other);
498 /* Merge dependencies */
499 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
500 merge_dependencies(u, other, d);
502 other->meta.load_state = UNIT_MERGED;
503 other->meta.merged_into = u;
505 /* If there is still some data attached to the other node, we
506 * don't need it anymore, and can free it. */
507 if (other->meta.load_state != UNIT_STUB)
508 if (UNIT_VTABLE(other)->done)
509 UNIT_VTABLE(other)->done(other);
511 unit_add_to_dbus_queue(u);
512 unit_add_to_cleanup_queue(other);
517 int unit_merge_by_name(Unit *u, const char *name) {
525 if (unit_name_is_template(name)) {
526 if (!u->meta.instance)
529 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
535 if (!(other = manager_get_unit(u->meta.manager, name)))
536 r = unit_add_name(u, name);
538 r = unit_merge(u, other);
544 Unit* unit_follow_merge(Unit *u) {
547 while (u->meta.load_state == UNIT_MERGED)
548 assert_se(u = u->meta.merged_into);
553 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
559 if (c->std_output != EXEC_OUTPUT_KMSG &&
560 c->std_output != EXEC_OUTPUT_SYSLOG &&
561 c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
562 c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
563 c->std_error != EXEC_OUTPUT_KMSG &&
564 c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
565 c->std_error != EXEC_OUTPUT_KMSG &&
566 c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
569 /* If syslog or kernel logging is requested, make sure our own
570 * logging daemon is run first. */
572 if (u->meta.manager->running_as == MANAGER_SYSTEM)
573 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
579 const char *unit_description(Unit *u) {
582 if (u->meta.description)
583 return u->meta.description;
585 return strna(u->meta.id);
588 void unit_dump(Unit *u, FILE *f, const char *prefix) {
596 timestamp1[FORMAT_TIMESTAMP_MAX],
597 timestamp2[FORMAT_TIMESTAMP_MAX],
598 timestamp3[FORMAT_TIMESTAMP_MAX],
599 timestamp4[FORMAT_TIMESTAMP_MAX],
600 timespan[FORMAT_TIMESPAN_MAX];
604 assert(u->meta.type >= 0);
608 p2 = strappend(prefix, "\t");
609 prefix2 = p2 ? p2 : prefix;
613 "%s\tDescription: %s\n"
615 "%s\tUnit Load State: %s\n"
616 "%s\tUnit Active State: %s\n"
617 "%s\tInactive Exit Timestamp: %s\n"
618 "%s\tActive Enter Timestamp: %s\n"
619 "%s\tActive Exit Timestamp: %s\n"
620 "%s\tInactive Enter Timestamp: %s\n"
621 "%s\tGC Check Good: %s\n"
622 "%s\tNeed Daemon Reload: %s\n",
624 prefix, unit_description(u),
625 prefix, strna(u->meta.instance),
626 prefix, unit_load_state_to_string(u->meta.load_state),
627 prefix, unit_active_state_to_string(unit_active_state(u)),
628 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
629 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
630 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
631 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
632 prefix, yes_no(unit_check_gc(u)),
633 prefix, yes_no(unit_need_daemon_reload(u)));
635 SET_FOREACH(t, u->meta.names, i)
636 fprintf(f, "%s\tName: %s\n", prefix, t);
638 if ((following = unit_following(u)))
639 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
641 if (u->meta.fragment_path)
642 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
644 if (u->meta.job_timeout > 0)
645 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
647 condition_dump_list(u->meta.conditions, f, prefix);
649 if (dual_timestamp_is_set(&u->meta.condition_timestamp))
651 "%s\tCondition Timestamp: %s\n"
652 "%s\tCondition Result: %s\n",
653 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
654 prefix, yes_no(u->meta.condition_result));
656 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
659 SET_FOREACH(other, u->meta.dependencies[d], i)
660 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
663 if (u->meta.load_state == UNIT_LOADED) {
665 "%s\tStopWhenUnneeded: %s\n"
666 "%s\tRefuseManualStart: %s\n"
667 "%s\tRefuseManualStop: %s\n"
668 "%s\tDefaultDependencies: %s\n"
669 "%s\tOnFailureIsolate: %s\n"
670 "%s\tIgnoreOnIsolate: %s\n"
671 "%s\tIgnoreOnSnapshot: %s\n",
672 prefix, yes_no(u->meta.stop_when_unneeded),
673 prefix, yes_no(u->meta.refuse_manual_start),
674 prefix, yes_no(u->meta.refuse_manual_stop),
675 prefix, yes_no(u->meta.default_dependencies),
676 prefix, yes_no(u->meta.on_failure_isolate),
677 prefix, yes_no(u->meta.ignore_on_isolate),
678 prefix, yes_no(u->meta.ignore_on_snapshot));
680 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
681 fprintf(f, "%s\tControlGroup: %s:%s\n",
682 prefix, b->controller, b->path);
684 if (UNIT_VTABLE(u)->dump)
685 UNIT_VTABLE(u)->dump(u, f, prefix2);
687 } else if (u->meta.load_state == UNIT_MERGED)
689 "%s\tMerged into: %s\n",
690 prefix, u->meta.merged_into->meta.id);
691 else if (u->meta.load_state == UNIT_ERROR)
692 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
696 job_dump(u->meta.job, f, prefix2);
701 /* Common implementation for multiple backends */
702 int unit_load_fragment_and_dropin(Unit *u) {
707 /* Load a .service file */
708 if ((r = unit_load_fragment(u)) < 0)
711 if (u->meta.load_state == UNIT_STUB)
714 /* Load drop-in directory data */
715 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
721 /* Common implementation for multiple backends */
722 int unit_load_fragment_and_dropin_optional(Unit *u) {
727 /* Same as unit_load_fragment_and_dropin(), but whether
728 * something can be loaded or not doesn't matter. */
730 /* Load a .service file */
731 if ((r = unit_load_fragment(u)) < 0)
734 if (u->meta.load_state == UNIT_STUB)
735 u->meta.load_state = UNIT_LOADED;
737 /* Load drop-in directory data */
738 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
744 int unit_add_default_target_dependency(Unit *u, Unit *target) {
748 if (target->meta.type != UNIT_TARGET)
751 /* Only add the dependency if both units are loaded, so that
752 * that loop check below is reliable */
753 if (u->meta.load_state != UNIT_LOADED ||
754 target->meta.load_state != UNIT_LOADED)
757 /* If either side wants no automatic dependencies, then let's
759 if (!u->meta.default_dependencies ||
760 target->meta.default_dependencies)
763 /* Don't create loops */
764 if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
767 return unit_add_dependency(target, UNIT_AFTER, u, true);
770 static int unit_add_default_dependencies(Unit *u) {
771 static const UnitDependency deps[] = {
773 UNIT_REQUIRED_BY_OVERRIDABLE,
785 for (k = 0; k < ELEMENTSOF(deps); k++)
786 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
787 if ((r = unit_add_default_target_dependency(u, target)) < 0)
793 int unit_load(Unit *u) {
798 if (u->meta.in_load_queue) {
799 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
800 u->meta.in_load_queue = false;
803 if (u->meta.type == _UNIT_TYPE_INVALID)
806 if (u->meta.load_state != UNIT_STUB)
809 if (UNIT_VTABLE(u)->load)
810 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
813 if (u->meta.load_state == UNIT_STUB) {
818 if (u->meta.load_state == UNIT_LOADED &&
819 u->meta.default_dependencies)
820 if ((r = unit_add_default_dependencies(u)) < 0)
823 if (u->meta.on_failure_isolate &&
824 set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {
826 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
833 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
835 unit_add_to_dbus_queue(unit_follow_merge(u));
836 unit_add_to_gc_queue(u);
841 u->meta.load_state = UNIT_ERROR;
842 u->meta.load_error = r;
843 unit_add_to_dbus_queue(u);
845 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
850 bool unit_condition_test(Unit *u) {
853 dual_timestamp_get(&u->meta.condition_timestamp);
854 u->meta.condition_result = condition_test_list(u->meta.conditions);
856 return u->meta.condition_result;
860 * -EBADR: This unit type does not support starting.
861 * -EALREADY: Unit is already started.
862 * -EAGAIN: An operation is already in progress. Retry later.
863 * -ECANCELED: Too many requests for now.
865 int unit_start(Unit *u) {
866 UnitActiveState state;
871 if (u->meta.load_state != UNIT_LOADED)
874 /* If this is already (being) started, then this will
875 * succeed. Note that this will even succeed if this unit is
876 * not startable by the user. This is relied on to detect when
877 * we need to wait for units and when waiting is finished. */
878 state = unit_active_state(u);
879 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
882 /* If the conditions failed, don't do anything at all */
883 if (!unit_condition_test(u)) {
884 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
888 /* Forward to the main object, if we aren't it. */
889 if ((following = unit_following(u))) {
890 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
891 return unit_start(following);
894 /* If it is stopped, but we cannot start it, then fail */
895 if (!UNIT_VTABLE(u)->start)
898 /* We don't suppress calls to ->start() here when we are
899 * already starting, to allow this request to be used as a
900 * "hurry up" call, for example when the unit is in some "auto
901 * restart" state where it waits for a holdoff timer to elapse
902 * before it will start again. */
904 unit_add_to_dbus_queue(u);
906 unit_status_printf(u, "Starting %s...\n", unit_description(u));
907 return UNIT_VTABLE(u)->start(u);
910 bool unit_can_start(Unit *u) {
913 return !!UNIT_VTABLE(u)->start;
916 bool unit_can_isolate(Unit *u) {
919 return unit_can_start(u) &&
920 u->meta.allow_isolate;
924 * -EBADR: This unit type does not support stopping.
925 * -EALREADY: Unit is already stopped.
926 * -EAGAIN: An operation is already in progress. Retry later.
928 int unit_stop(Unit *u) {
929 UnitActiveState state;
934 state = unit_active_state(u);
935 if (UNIT_IS_INACTIVE_OR_FAILED(state))
938 if ((following = unit_following(u))) {
939 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
940 return unit_stop(following);
943 if (!UNIT_VTABLE(u)->stop)
946 unit_add_to_dbus_queue(u);
948 unit_status_printf(u, "Stopping %s...\n", unit_description(u));
949 return UNIT_VTABLE(u)->stop(u);
953 * -EBADR: This unit type does not support reloading.
954 * -ENOEXEC: Unit is not started.
955 * -EAGAIN: An operation is already in progress. Retry later.
957 int unit_reload(Unit *u) {
958 UnitActiveState state;
963 if (u->meta.load_state != UNIT_LOADED)
966 if (!unit_can_reload(u))
969 state = unit_active_state(u);
970 if (state == UNIT_RELOADING)
973 if (state != UNIT_ACTIVE)
976 if ((following = unit_following(u))) {
977 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
978 return unit_reload(following);
981 unit_add_to_dbus_queue(u);
982 return UNIT_VTABLE(u)->reload(u);
985 bool unit_can_reload(Unit *u) {
988 if (!UNIT_VTABLE(u)->reload)
991 if (!UNIT_VTABLE(u)->can_reload)
994 return UNIT_VTABLE(u)->can_reload(u);
997 static void unit_check_unneeded(Unit *u) {
1003 /* If this service shall be shut down when unneeded then do
1006 if (!u->meta.stop_when_unneeded)
1009 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1012 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1013 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1016 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1017 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1020 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
1021 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1024 SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1025 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1028 log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
1030 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1031 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1034 static void retroactively_start_dependencies(Unit *u) {
1039 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1041 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1042 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1043 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1044 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1046 SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1047 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1048 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1049 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1051 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1052 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1053 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1054 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1056 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1057 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1058 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1059 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1061 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1062 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1063 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1064 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1066 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1067 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1068 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1070 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1071 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1072 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1075 static void retroactively_stop_dependencies(Unit *u) {
1080 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1082 /* Pull down units which are bound to us recursively if enabled */
1083 SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1084 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1085 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1087 /* Garbage collect services that might not be needed anymore, if enabled */
1088 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1089 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1090 unit_check_unneeded(other);
1091 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1092 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1093 unit_check_unneeded(other);
1094 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1095 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1096 unit_check_unneeded(other);
1097 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1098 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1099 unit_check_unneeded(other);
1100 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1101 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1102 unit_check_unneeded(other);
1103 SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1104 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1105 unit_check_unneeded(other);
1108 void unit_trigger_on_failure(Unit *u) {
1114 if (set_size(u->meta.dependencies[UNIT_ON_FAILURE]) <= 0)
1117 log_info("Triggering OnFailure= dependencies of %s.", u->meta.id);
1119 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i) {
1122 if ((r = manager_add_job(u->meta.manager, JOB_START, other, u->meta.on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1123 log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1127 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1131 assert(os < _UNIT_ACTIVE_STATE_MAX);
1132 assert(ns < _UNIT_ACTIVE_STATE_MAX);
1134 /* Note that this is called for all low-level state changes,
1135 * even if they might map to the same high-level
1136 * UnitActiveState! That means that ns == os is OK an expected
1137 * behaviour here. For example: if a mount point is remounted
1138 * this function will be called too! */
1140 if (u->meta.manager->n_deserializing <= 0) {
1143 dual_timestamp_get(&ts);
1145 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1146 u->meta.inactive_exit_timestamp = ts;
1147 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1148 u->meta.inactive_enter_timestamp = ts;
1150 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1151 u->meta.active_enter_timestamp = ts;
1152 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1153 u->meta.active_exit_timestamp = ts;
1155 timer_unit_notify(u, ns);
1156 path_unit_notify(u, ns);
1159 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1160 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1165 if (u->meta.job->state == JOB_WAITING)
1167 /* So we reached a different state for this
1168 * job. Let's see if we can run it now if it
1169 * failed previously due to EAGAIN. */
1170 job_add_to_run_queue(u->meta.job);
1172 /* Let's check whether this state change constitutes a
1173 * finished job, or maybe contradicts a running job and
1174 * hence needs to invalidate jobs. */
1176 switch (u->meta.job->type) {
1179 case JOB_VERIFY_ACTIVE:
1181 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1182 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1183 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1186 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1187 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1193 case JOB_RELOAD_OR_START:
1195 if (u->meta.job->state == JOB_RUNNING) {
1196 if (ns == UNIT_ACTIVE)
1197 job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1198 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1201 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1202 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1210 case JOB_TRY_RESTART:
1212 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1213 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1214 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1216 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1222 assert_not_reached("Job type unknown");
1228 if (u->meta.manager->n_deserializing <= 0) {
1230 /* If this state change happened without being
1231 * requested by a job, then let's retroactively start
1232 * or stop dependencies. We skip that step when
1233 * deserializing, since we don't want to create any
1234 * additional jobs just because something is already
1238 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1239 retroactively_start_dependencies(u);
1240 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1241 retroactively_stop_dependencies(u);
1244 if (ns != os && ns == UNIT_FAILED) {
1245 log_notice("Unit %s entered failed state.", u->meta.id);
1246 unit_trigger_on_failure(u);
1250 /* Some names are special */
1251 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1253 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1254 /* The bus just might have become available,
1255 * hence try to connect to it, if we aren't
1257 bus_init(u->meta.manager, true);
1259 if (u->meta.type == UNIT_SERVICE &&
1260 !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1261 u->meta.manager->n_deserializing <= 0) {
1262 /* Write audit record if we have just finished starting up */
1263 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1264 u->meta.in_audit = true;
1267 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1268 manager_send_unit_plymouth(u->meta.manager, u);
1272 /* We don't care about D-Bus here, since we'll get an
1273 * asynchronous notification for it anyway. */
1275 if (u->meta.type == UNIT_SERVICE &&
1276 UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1277 !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1278 u->meta.manager->n_deserializing <= 0) {
1280 /* Hmm, if there was no start record written
1281 * write it now, so that we always have a nice
1283 if (!u->meta.in_audit) {
1284 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1286 if (ns == UNIT_INACTIVE)
1287 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1289 /* Write audit record if we have just finished shutting down */
1290 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1292 u->meta.in_audit = false;
1296 manager_recheck_syslog(u->meta.manager);
1298 /* Maybe we finished startup and are now ready for being
1299 * stopped because unneeded? */
1300 unit_check_unneeded(u);
1302 unit_add_to_dbus_queue(u);
1303 unit_add_to_gc_queue(u);
1306 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1307 struct epoll_event ev;
1312 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1318 if (epoll_ctl(u->meta.manager->epoll_fd,
1319 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1331 void unit_unwatch_fd(Unit *u, Watch *w) {
1335 if (w->type == WATCH_INVALID)
1338 assert(w->type == WATCH_FD);
1339 assert(w->data.unit == u);
1340 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1343 w->type = WATCH_INVALID;
1344 w->data.unit = NULL;
1347 int unit_watch_pid(Unit *u, pid_t pid) {
1351 /* Watch a specific PID. We only support one unit watching
1352 * each PID for now. */
1354 return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1357 void unit_unwatch_pid(Unit *u, pid_t pid) {
1361 hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1364 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1365 struct itimerspec its;
1371 assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1373 /* This will try to reuse the old timer if there is one */
1375 if (w->type == WATCH_UNIT_TIMER) {
1376 assert(w->data.unit == u);
1381 } else if (w->type == WATCH_INVALID) {
1384 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1387 assert_not_reached("Invalid watch type");
1392 /* Set absolute time in the past, but not 0, since we
1393 * don't want to disarm the timer */
1394 its.it_value.tv_sec = 0;
1395 its.it_value.tv_nsec = 1;
1397 flags = TFD_TIMER_ABSTIME;
1399 timespec_store(&its.it_value, delay);
1403 /* This will also flush the elapse counter */
1404 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1407 if (w->type == WATCH_INVALID) {
1408 struct epoll_event ev;
1412 ev.events = EPOLLIN;
1414 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1418 w->type = WATCH_UNIT_TIMER;
1426 close_nointr_nofail(fd);
1431 void unit_unwatch_timer(Unit *u, Watch *w) {
1435 if (w->type == WATCH_INVALID)
1438 assert(w->type == WATCH_UNIT_TIMER);
1439 assert(w->data.unit == u);
1442 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1443 close_nointr_nofail(w->fd);
1446 w->type = WATCH_INVALID;
1447 w->data.unit = NULL;
1450 bool unit_job_is_applicable(Unit *u, JobType j) {
1452 assert(j >= 0 && j < _JOB_TYPE_MAX);
1456 case JOB_VERIFY_ACTIVE:
1462 case JOB_TRY_RESTART:
1463 return unit_can_start(u);
1466 return unit_can_reload(u);
1468 case JOB_RELOAD_OR_START:
1469 return unit_can_reload(u) && unit_can_start(u);
1472 assert_not_reached("Invalid job type");
1476 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1478 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1479 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1480 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1481 [UNIT_WANTS] = UNIT_WANTED_BY,
1482 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1483 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1484 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1485 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1486 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1487 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1488 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1489 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1490 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1491 [UNIT_BEFORE] = UNIT_AFTER,
1492 [UNIT_AFTER] = UNIT_BEFORE,
1493 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1494 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1495 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1497 int r, q = 0, v = 0, w = 0;
1500 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1503 u = unit_follow_merge(u);
1504 other = unit_follow_merge(other);
1506 /* We won't allow dependencies on ourselves. We will not
1507 * consider them an error however. */
1511 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1514 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1515 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1519 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1520 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1523 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1526 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1527 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1532 if (add_reference) {
1533 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1538 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1542 unit_add_to_dbus_queue(u);
1547 set_remove(u->meta.dependencies[d], other);
1550 set_remove(other->meta.dependencies[inverse_table[d]], u);
1553 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1558 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1563 if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1566 if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1572 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1576 assert(name || path);
1579 name = file_name_from_path(path);
1581 if (!unit_name_is_template(name)) {
1586 if (u->meta.instance)
1587 s = unit_name_replace_instance(name, u->meta.instance);
1591 if (!(i = unit_name_to_prefix(u->meta.id)))
1594 s = unit_name_replace_instance(name, i);
1605 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1611 assert(name || path);
1613 if (!(name = resolve_template(u, name, path, &s)))
1616 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1619 r = unit_add_dependency(u, d, other, add_reference);
1626 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1632 assert(name || path);
1634 if (!(name = resolve_template(u, name, path, &s)))
1637 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1640 r = unit_add_two_dependencies(u, d, e, other, add_reference);
1647 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1653 assert(name || path);
1655 if (!(name = resolve_template(u, name, path, &s)))
1658 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1661 r = unit_add_dependency(other, d, u, add_reference);
1668 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1674 assert(name || path);
1676 if (!(name = resolve_template(u, name, path, &s)))
1679 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1682 if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1690 int set_unit_path(const char *p) {
1694 /* This is mostly for debug purposes */
1696 if (path_is_absolute(p)) {
1697 if (!(c = strdup(p)))
1700 if (!(cwd = get_current_dir_name()))
1703 r = asprintf(&c, "%s/%s", cwd, p);
1710 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1719 char *unit_dbus_path(Unit *u) {
1727 if (!(e = bus_path_escape(u->meta.id)))
1730 p = strappend("/org/freedesktop/systemd1/unit/", e);
1736 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1744 if (!b->controller) {
1745 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1751 /* Ensure this hasn't been added yet */
1754 if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1757 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1758 LIST_PREPEND(CGroupBonding, by_path, l, b);
1760 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1761 LIST_REMOVE(CGroupBonding, by_path, l, b);
1766 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1772 static char *default_cgroup_path(Unit *u) {
1778 if (u->meta.instance) {
1781 if (!(t = unit_name_template(u->meta.id)))
1784 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1787 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1789 return r < 0 ? NULL : p;
1792 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1793 char *controller = NULL, *path = NULL;
1794 CGroupBonding *b = NULL;
1801 if ((r = cg_split_spec(name, &controller, &path)) < 0)
1805 path = default_cgroup_path(u);
1810 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1814 if (!path || !controller) {
1821 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1826 if (!(b = new0(CGroupBonding, 1))) {
1831 b->controller = controller;
1834 b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1836 if ((r = unit_add_cgroup(u, b)) < 0)
1849 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1850 CGroupBonding *b = NULL;
1856 controller = SYSTEMD_CGROUP_CONTROLLER;
1858 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1861 if (!(b = new0(CGroupBonding, 1)))
1864 if (!(b->controller = strdup(controller)))
1867 if (!(b->path = default_cgroup_path(u)))
1871 b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1873 if ((r = unit_add_cgroup(u, b)) < 0)
1880 free(b->controller);
1886 int unit_add_default_cgroups(Unit *u) {
1891 /* Adds in the default cgroups, if they weren't specified
1894 if (!u->meta.manager->cgroup_hierarchy)
1897 if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1900 STRV_FOREACH(c, u->meta.manager->default_controllers)
1901 if ((r = unit_add_one_default_cgroup(u, *c)) < 0)
1907 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1910 return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1913 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1921 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1924 assert(!unit_has_name(u, t));
1926 r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1929 assert(r < 0 || *_found != u);
1934 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1942 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1945 assert(!unit_has_name(u, t));
1947 found = manager_get_unit(u->meta.manager, t);
1957 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1961 return unit_name_to_prefix_and_instance(u->meta.id);
1964 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1968 return unit_name_to_prefix(u->meta.id);
1971 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1977 if (!(p = unit_name_to_prefix(u->meta.id)))
1980 r = unit_name_unescape(p);
1986 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1990 if (u->meta.instance)
1991 return unit_name_unescape(u->meta.instance);
1996 static char *specifier_filename(char specifier, void *data, void *userdata) {
2000 if (u->meta.instance)
2001 return unit_name_path_unescape(u->meta.instance);
2003 return unit_name_to_path(u->meta.instance);
2006 static char *specifier_cgroup(char specifier, void *data, void *userdata) {
2010 return default_cgroup_path(u);
2013 static char *specifier_cgroup_root(char specifier, void *data, void *userdata) {
2018 if (specifier == 'r')
2019 return strdup(u->meta.manager->cgroup_hierarchy);
2021 if (parent_of_path(u->meta.manager->cgroup_hierarchy, &p) < 0)
2024 if (streq(p, "/")) {
2032 static char *specifier_runtime(char specifier, void *data, void *userdata) {
2036 if (u->meta.manager->running_as == MANAGER_USER) {
2039 e = getenv("XDG_RUNTIME_DIR");
2044 return strdup("/run");
2047 char *unit_name_printf(Unit *u, const char* format) {
2050 * This will use the passed string as format string and
2051 * replace the following specifiers:
2053 * %n: the full id of the unit (foo@bar.waldo)
2054 * %N: the id of the unit without the suffix (foo@bar)
2055 * %p: the prefix (foo)
2056 * %i: the instance (bar)
2059 const Specifier table[] = {
2060 { 'n', specifier_string, u->meta.id },
2061 { 'N', specifier_prefix_and_instance, NULL },
2062 { 'p', specifier_prefix, NULL },
2063 { 'i', specifier_string, u->meta.instance },
2070 return specifier_printf(format, table, u);
2073 char *unit_full_printf(Unit *u, const char *format) {
2075 /* This is similar to unit_name_printf() but also supports
2076 * unescaping. Also, adds a couple of additional codes:
2078 * %c cgroup path of unit
2079 * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
2080 * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
2081 * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
2084 const Specifier table[] = {
2085 { 'n', specifier_string, u->meta.id },
2086 { 'N', specifier_prefix_and_instance, NULL },
2087 { 'p', specifier_prefix, NULL },
2088 { 'P', specifier_prefix_unescaped, NULL },
2089 { 'i', specifier_string, u->meta.instance },
2090 { 'I', specifier_instance_unescaped, NULL },
2091 { 'f', specifier_filename, NULL },
2092 { 'c', specifier_cgroup, NULL },
2093 { 'r', specifier_cgroup_root, NULL },
2094 { 'R', specifier_cgroup_root, NULL },
2095 { 't', specifier_runtime, NULL },
2102 return specifier_printf(format, table, u);
2105 char **unit_full_printf_strv(Unit *u, char **l) {
2109 /* Applies unit_full_printf to every entry in l */
2114 if (!(r = new(char*, n+1)))
2117 for (i = l, j = r; *i; i++, j++)
2118 if (!(*j = unit_full_printf(u, *i)))
2125 for (j--; j >= r; j--)
2133 int unit_watch_bus_name(Unit *u, const char *name) {
2137 /* Watch a specific name on the bus. We only support one unit
2138 * watching each name for now. */
2140 return hashmap_put(u->meta.manager->watch_bus, name, u);
2143 void unit_unwatch_bus_name(Unit *u, const char *name) {
2147 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2150 bool unit_can_serialize(Unit *u) {
2153 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2156 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2163 if (!unit_can_serialize(u))
2166 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2170 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2172 dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2173 dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2174 dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2175 dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2176 dual_timestamp_serialize(f, "condition-timestamp", &u->meta.condition_timestamp);
2178 if (dual_timestamp_is_set(&u->meta.condition_timestamp))
2179 unit_serialize_item(u, f, "condition-result", yes_no(u->meta.condition_result));
2186 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2197 va_start(ap, format);
2198 vfprintf(f, format, ap);
2204 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2210 fprintf(f, "%s=%s\n", key, value);
2213 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2220 if (!unit_can_serialize(u))
2224 char line[LINE_MAX], *l, *v;
2227 if (!fgets(line, sizeof(line), f)) {
2240 k = strcspn(l, "=");
2248 if (streq(l, "job")) {
2251 if ((type = job_type_from_string(v)) < 0)
2252 log_debug("Failed to parse job type value %s", v);
2254 u->meta.deserialized_job = type;
2257 } else if (streq(l, "inactive-exit-timestamp")) {
2258 dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2260 } else if (streq(l, "active-enter-timestamp")) {
2261 dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2263 } else if (streq(l, "active-exit-timestamp")) {
2264 dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2266 } else if (streq(l, "inactive-enter-timestamp")) {
2267 dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2269 } else if (streq(l, "condition-timestamp")) {
2270 dual_timestamp_deserialize(v, &u->meta.condition_timestamp);
2272 } else if (streq(l, "condition-result")) {
2275 if ((b = parse_boolean(v)) < 0)
2276 log_debug("Failed to parse condition result value %s", v);
2278 u->meta.condition_result = b;
2283 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2288 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2298 /* Adds in links to the device node that this unit is based on */
2300 if (!is_device_path(what))
2303 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2306 r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2312 if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2316 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2322 int unit_coldplug(Unit *u) {
2327 if (UNIT_VTABLE(u)->coldplug)
2328 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2331 if (u->meta.deserialized_job >= 0) {
2332 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
2335 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2341 void unit_status_printf(Unit *u, const char *format, ...) {
2347 if (!UNIT_VTABLE(u)->show_status)
2350 if (u->meta.manager->running_as != MANAGER_SYSTEM)
2353 /* If Plymouth is running make sure we show the status, so
2354 * that there's something nice to see when people press Esc */
2356 if (!u->meta.manager->show_status && !plymouth_running())
2359 if (!manager_is_booting_or_shutting_down(u->meta.manager))
2362 va_start(ap, format);
2363 status_vprintf(format, ap);
2367 bool unit_need_daemon_reload(Unit *u) {
2370 if (u->meta.fragment_path) {
2374 if (stat(u->meta.fragment_path, &st) < 0)
2375 /* What, cannot access this anymore? */
2378 if (u->meta.fragment_mtime > 0 &&
2379 timespec_load(&st.st_mtim) != u->meta.fragment_mtime)
2383 if (UNIT_VTABLE(u)->need_daemon_reload)
2384 return UNIT_VTABLE(u)->need_daemon_reload(u);
2389 void unit_reset_failed(Unit *u) {
2392 if (UNIT_VTABLE(u)->reset_failed)
2393 UNIT_VTABLE(u)->reset_failed(u);
2396 Unit *unit_following(Unit *u) {
2399 if (UNIT_VTABLE(u)->following)
2400 return UNIT_VTABLE(u)->following(u);
2405 bool unit_pending_inactive(Unit *u) {
2408 /* Returns true if the unit is inactive or going down */
2410 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2413 if (u->meta.job && u->meta.job->type == JOB_STOP)
2419 bool unit_pending_active(Unit *u) {
2422 /* Returns true if the unit is inactive or going down */
2424 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2428 (u->meta.job->type == JOB_START ||
2429 u->meta.job->type == JOB_RELOAD_OR_START ||
2430 u->meta.job->type == JOB_RESTART))
2436 UnitType unit_name_to_type(const char *n) {
2441 for (t = 0; t < _UNIT_TYPE_MAX; t++)
2442 if (endswith(n, unit_vtable[t]->suffix))
2445 return _UNIT_TYPE_INVALID;
2448 bool unit_name_is_valid(const char *n, bool template_ok) {
2451 t = unit_name_to_type(n);
2452 if (t < 0 || t >= _UNIT_TYPE_MAX)
2455 return unit_name_is_valid_no_type(n, template_ok);
2458 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2460 assert(w >= 0 && w < _KILL_WHO_MAX);
2461 assert(m >= 0 && m < _KILL_MODE_MAX);
2463 assert(signo < _NSIG);
2468 if (!UNIT_VTABLE(u)->kill)
2471 return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2474 int unit_following_set(Unit *u, Set **s) {
2478 if (UNIT_VTABLE(u)->following_set)
2479 return UNIT_VTABLE(u)->following_set(u, s);
2485 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2486 [UNIT_STUB] = "stub",
2487 [UNIT_LOADED] = "loaded",
2488 [UNIT_ERROR] = "error",
2489 [UNIT_MERGED] = "merged",
2490 [UNIT_MASKED] = "masked"
2493 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2495 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2496 [UNIT_ACTIVE] = "active",
2497 [UNIT_RELOADING] = "reloading",
2498 [UNIT_INACTIVE] = "inactive",
2499 [UNIT_FAILED] = "failed",
2500 [UNIT_ACTIVATING] = "activating",
2501 [UNIT_DEACTIVATING] = "deactivating"
2504 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2506 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2507 [UNIT_REQUIRES] = "Requires",
2508 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2509 [UNIT_WANTS] = "Wants",
2510 [UNIT_REQUISITE] = "Requisite",
2511 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2512 [UNIT_REQUIRED_BY] = "RequiredBy",
2513 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2514 [UNIT_BIND_TO] = "BindTo",
2515 [UNIT_WANTED_BY] = "WantedBy",
2516 [UNIT_CONFLICTS] = "Conflicts",
2517 [UNIT_CONFLICTED_BY] = "ConflictedBy",
2518 [UNIT_BOUND_BY] = "BoundBy",
2519 [UNIT_BEFORE] = "Before",
2520 [UNIT_AFTER] = "After",
2521 [UNIT_REFERENCES] = "References",
2522 [UNIT_REFERENCED_BY] = "ReferencedBy",
2523 [UNIT_ON_FAILURE] = "OnFailure"
2526 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);