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 Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser 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>
32 #include "systemd/sd-id128.h"
33 #include "systemd/sd-messages.h"
38 #include "path-util.h"
39 #include "load-fragment.h"
40 #include "load-dropin.h"
42 #include "unit-name.h"
43 #include "dbus-unit.h"
45 #include "cgroup-util.h"
47 #include "cgroup-attr.h"
50 #include "fileio-label.h"
52 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
53 [UNIT_SERVICE] = &service_vtable,
54 [UNIT_TIMER] = &timer_vtable,
55 [UNIT_SOCKET] = &socket_vtable,
56 [UNIT_TARGET] = &target_vtable,
57 [UNIT_DEVICE] = &device_vtable,
58 [UNIT_MOUNT] = &mount_vtable,
59 [UNIT_AUTOMOUNT] = &automount_vtable,
60 [UNIT_SNAPSHOT] = &snapshot_vtable,
61 [UNIT_SWAP] = &swap_vtable,
62 [UNIT_PATH] = &path_vtable
65 Unit *unit_new(Manager *m, size_t size) {
69 assert(size >= sizeof(Unit));
75 u->names = set_new(string_hash_func, string_compare_func);
82 u->type = _UNIT_TYPE_INVALID;
83 u->deserialized_job = _JOB_TYPE_INVALID;
84 u->default_dependencies = true;
85 u->unit_file_state = _UNIT_FILE_STATE_INVALID;
90 bool unit_has_name(Unit *u, const char *name) {
94 return !!set_get(u->names, (char*) name);
97 int unit_add_name(Unit *u, const char *text) {
105 if (unit_name_is_template(text)) {
109 s = unit_name_replace_instance(text, u->instance);
116 if (!unit_name_is_valid(s, false)) {
121 assert_se((t = unit_name_to_type(s)) >= 0);
123 if (u->type != _UNIT_TYPE_INVALID && t != u->type) {
128 if ((r = unit_name_to_instance(s, &i)) < 0)
131 if (i && unit_vtable[t]->no_instances) {
136 /* Ensure that this unit is either instanced or not instanced,
138 if (u->type != _UNIT_TYPE_INVALID && !u->instance != !i) {
143 if (unit_vtable[t]->no_alias &&
144 !set_isempty(u->names) &&
145 !set_get(u->names, s)) {
150 if (hashmap_size(u->manager->units) >= MANAGER_MAX_NAMES) {
155 if ((r = set_put(u->names, s)) < 0) {
161 if ((r = hashmap_put(u->manager->units, s, u)) < 0) {
162 set_remove(u->names, s);
166 if (u->type == _UNIT_TYPE_INVALID) {
172 LIST_PREPEND(Unit, units_by_type, u->manager->units_by_type[t], u);
174 if (UNIT_VTABLE(u)->init)
175 UNIT_VTABLE(u)->init(u);
179 unit_add_to_dbus_queue(u);
189 int unit_choose_id(Unit *u, const char *name) {
190 char *s, *t = NULL, *i;
196 if (unit_name_is_template(name)) {
201 if (!(t = unit_name_replace_instance(name, u->instance)))
207 /* Selects one of the names of this unit as the id */
208 s = set_get(u->names, (char*) name);
214 if ((r = unit_name_to_instance(s, &i)) < 0)
222 unit_add_to_dbus_queue(u);
227 int unit_set_description(Unit *u, const char *description) {
232 if (!(s = strdup(description)))
235 free(u->description);
238 unit_add_to_dbus_queue(u);
242 bool unit_check_gc(Unit *u) {
245 if (u->load_state == UNIT_STUB)
248 if (UNIT_VTABLE(u)->no_gc)
260 if (unit_active_state(u) != UNIT_INACTIVE)
266 if (UNIT_VTABLE(u)->check_gc)
267 if (UNIT_VTABLE(u)->check_gc(u))
273 void unit_add_to_load_queue(Unit *u) {
275 assert(u->type != _UNIT_TYPE_INVALID);
277 if (u->load_state != UNIT_STUB || u->in_load_queue)
280 LIST_PREPEND(Unit, load_queue, u->manager->load_queue, u);
281 u->in_load_queue = true;
284 void unit_add_to_cleanup_queue(Unit *u) {
287 if (u->in_cleanup_queue)
290 LIST_PREPEND(Unit, cleanup_queue, u->manager->cleanup_queue, u);
291 u->in_cleanup_queue = true;
294 void unit_add_to_gc_queue(Unit *u) {
297 if (u->in_gc_queue || u->in_cleanup_queue)
300 if (unit_check_gc(u))
303 LIST_PREPEND(Unit, gc_queue, u->manager->gc_queue, u);
304 u->in_gc_queue = true;
306 u->manager->n_in_gc_queue ++;
308 if (u->manager->gc_queue_timestamp <= 0)
309 u->manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
312 void unit_add_to_dbus_queue(Unit *u) {
314 assert(u->type != _UNIT_TYPE_INVALID);
316 if (u->load_state == UNIT_STUB || u->in_dbus_queue)
319 /* Shortcut things if nobody cares */
320 if (!bus_has_subscriber(u->manager)) {
321 u->sent_dbus_new_signal = true;
325 LIST_PREPEND(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
326 u->in_dbus_queue = true;
329 static void bidi_set_free(Unit *u, Set *s) {
335 /* Frees the set and makes sure we are dropped from the
336 * inverse pointers */
338 SET_FOREACH(other, s, i) {
341 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
342 set_remove(other->dependencies[d], u);
344 unit_add_to_gc_queue(other);
350 void unit_free(Unit *u) {
357 bus_unit_send_removed_signal(u);
359 if (u->load_state != UNIT_STUB)
360 if (UNIT_VTABLE(u)->done)
361 UNIT_VTABLE(u)->done(u);
363 SET_FOREACH(t, u->names, i)
364 hashmap_remove_value(u->manager->units, t, u);
378 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
379 bidi_set_free(u, u->dependencies[d]);
381 if (u->requires_mounts_for) {
382 LIST_REMOVE(Unit, has_requires_mounts_for, u->manager->has_requires_mounts_for, u);
383 strv_free(u->requires_mounts_for);
386 if (u->type != _UNIT_TYPE_INVALID)
387 LIST_REMOVE(Unit, units_by_type, u->manager->units_by_type[u->type], u);
389 if (u->in_load_queue)
390 LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u);
392 if (u->in_dbus_queue)
393 LIST_REMOVE(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
395 if (u->in_cleanup_queue)
396 LIST_REMOVE(Unit, cleanup_queue, u->manager->cleanup_queue, u);
398 if (u->in_gc_queue) {
399 LIST_REMOVE(Unit, gc_queue, u->manager->gc_queue, u);
400 u->manager->n_in_gc_queue--;
403 cgroup_bonding_free_list(u->cgroup_bondings, u->manager->n_reloading <= 0);
404 cgroup_attribute_free_list(u->cgroup_attributes);
406 free(u->description);
407 strv_free(u->documentation);
408 free(u->fragment_path);
409 free(u->source_path);
412 set_free_free(u->names);
414 condition_free_list(u->conditions);
417 unit_ref_unset(u->refs);
422 UnitActiveState unit_active_state(Unit *u) {
425 if (u->load_state == UNIT_MERGED)
426 return unit_active_state(unit_follow_merge(u));
428 /* After a reload it might happen that a unit is not correctly
429 * loaded but still has a process around. That's why we won't
430 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
432 return UNIT_VTABLE(u)->active_state(u);
435 const char* unit_sub_state_to_string(Unit *u) {
438 return UNIT_VTABLE(u)->sub_state_to_string(u);
441 static void complete_move(Set **s, Set **other) {
449 set_move(*s, *other);
456 static void merge_names(Unit *u, Unit *other) {
463 complete_move(&u->names, &other->names);
465 set_free_free(other->names);
469 SET_FOREACH(t, u->names, i)
470 assert_se(hashmap_replace(u->manager->units, t, u) == 0);
473 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
480 assert(d < _UNIT_DEPENDENCY_MAX);
482 /* Fix backwards pointers */
483 SET_FOREACH(back, other->dependencies[d], i) {
486 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
487 if ((r = set_remove_and_put(back->dependencies[k], other, u)) < 0) {
490 set_remove(back->dependencies[k], other);
492 assert(r == -ENOENT);
496 complete_move(&u->dependencies[d], &other->dependencies[d]);
498 set_free(other->dependencies[d]);
499 other->dependencies[d] = NULL;
502 int unit_merge(Unit *u, Unit *other) {
507 assert(u->manager == other->manager);
508 assert(u->type != _UNIT_TYPE_INVALID);
510 other = unit_follow_merge(other);
515 if (u->type != other->type)
518 if (!u->instance != !other->instance)
521 if (other->load_state != UNIT_STUB &&
522 other->load_state != UNIT_ERROR)
531 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
535 merge_names(u, other);
537 /* Redirect all references */
539 unit_ref_set(other->refs, u);
541 /* Merge dependencies */
542 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
543 merge_dependencies(u, other, d);
545 other->load_state = UNIT_MERGED;
546 other->merged_into = u;
548 /* If there is still some data attached to the other node, we
549 * don't need it anymore, and can free it. */
550 if (other->load_state != UNIT_STUB)
551 if (UNIT_VTABLE(other)->done)
552 UNIT_VTABLE(other)->done(other);
554 unit_add_to_dbus_queue(u);
555 unit_add_to_cleanup_queue(other);
560 int unit_merge_by_name(Unit *u, const char *name) {
568 if (unit_name_is_template(name)) {
572 if (!(s = unit_name_replace_instance(name, u->instance)))
578 if (!(other = manager_get_unit(u->manager, name)))
579 r = unit_add_name(u, name);
581 r = unit_merge(u, other);
587 Unit* unit_follow_merge(Unit *u) {
590 while (u->load_state == UNIT_MERGED)
591 assert_se(u = u->merged_into);
596 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
602 if (c->std_output != EXEC_OUTPUT_KMSG &&
603 c->std_output != EXEC_OUTPUT_SYSLOG &&
604 c->std_output != EXEC_OUTPUT_JOURNAL &&
605 c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
606 c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
607 c->std_output != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
608 c->std_error != EXEC_OUTPUT_KMSG &&
609 c->std_error != EXEC_OUTPUT_SYSLOG &&
610 c->std_error != EXEC_OUTPUT_JOURNAL &&
611 c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
612 c->std_error != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
613 c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
616 /* If syslog or kernel logging is requested, make sure our own
617 * logging daemon is run first. */
619 if (u->manager->running_as == SYSTEMD_SYSTEM) {
620 r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true);
628 const char *unit_description(Unit *u) {
632 return u->description;
637 void unit_dump(Unit *u, FILE *f, const char *prefix) {
644 timestamp1[FORMAT_TIMESTAMP_MAX],
645 timestamp2[FORMAT_TIMESTAMP_MAX],
646 timestamp3[FORMAT_TIMESTAMP_MAX],
647 timestamp4[FORMAT_TIMESTAMP_MAX],
648 timespan[FORMAT_TIMESPAN_MAX];
652 assert(u->type >= 0);
656 p2 = strappend(prefix, "\t");
657 prefix2 = p2 ? p2 : prefix;
661 "%s\tDescription: %s\n"
663 "%s\tUnit Load State: %s\n"
664 "%s\tUnit Active State: %s\n"
665 "%s\tInactive Exit Timestamp: %s\n"
666 "%s\tActive Enter Timestamp: %s\n"
667 "%s\tActive Exit Timestamp: %s\n"
668 "%s\tInactive Enter Timestamp: %s\n"
669 "%s\tGC Check Good: %s\n"
670 "%s\tNeed Daemon Reload: %s\n",
672 prefix, unit_description(u),
673 prefix, strna(u->instance),
674 prefix, unit_load_state_to_string(u->load_state),
675 prefix, unit_active_state_to_string(unit_active_state(u)),
676 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->inactive_exit_timestamp.realtime)),
677 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->active_enter_timestamp.realtime)),
678 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->active_exit_timestamp.realtime)),
679 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->inactive_enter_timestamp.realtime)),
680 prefix, yes_no(unit_check_gc(u)),
681 prefix, yes_no(unit_need_daemon_reload(u)));
683 SET_FOREACH(t, u->names, i)
684 fprintf(f, "%s\tName: %s\n", prefix, t);
686 STRV_FOREACH(j, u->documentation)
687 fprintf(f, "%s\tDocumentation: %s\n", prefix, *j);
689 if ((following = unit_following(u)))
690 fprintf(f, "%s\tFollowing: %s\n", prefix, following->id);
692 if (u->fragment_path)
693 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->fragment_path);
696 fprintf(f, "%s\tSource Path: %s\n", prefix, u->source_path);
698 if (u->job_timeout > 0)
699 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->job_timeout));
701 condition_dump_list(u->conditions, f, prefix);
703 if (dual_timestamp_is_set(&u->condition_timestamp))
705 "%s\tCondition Timestamp: %s\n"
706 "%s\tCondition Result: %s\n",
707 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->condition_timestamp.realtime)),
708 prefix, yes_no(u->condition_result));
710 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
713 SET_FOREACH(other, u->dependencies[d], i)
714 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->id);
717 if (!strv_isempty(u->requires_mounts_for)) {
719 "%s\tRequiresMountsFor:", prefix);
721 STRV_FOREACH(j, u->requires_mounts_for)
722 fprintf(f, " %s", *j);
727 if (u->load_state == UNIT_LOADED) {
732 "%s\tStopWhenUnneeded: %s\n"
733 "%s\tRefuseManualStart: %s\n"
734 "%s\tRefuseManualStop: %s\n"
735 "%s\tDefaultDependencies: %s\n"
736 "%s\tOnFailureIsolate: %s\n"
737 "%s\tIgnoreOnIsolate: %s\n"
738 "%s\tIgnoreOnSnapshot: %s\n",
739 prefix, yes_no(u->stop_when_unneeded),
740 prefix, yes_no(u->refuse_manual_start),
741 prefix, yes_no(u->refuse_manual_stop),
742 prefix, yes_no(u->default_dependencies),
743 prefix, yes_no(u->on_failure_isolate),
744 prefix, yes_no(u->ignore_on_isolate),
745 prefix, yes_no(u->ignore_on_snapshot));
747 LIST_FOREACH(by_unit, b, u->cgroup_bondings)
748 fprintf(f, "%s\tControlGroup: %s:%s\n",
749 prefix, b->controller, b->path);
751 LIST_FOREACH(by_unit, a, u->cgroup_attributes) {
752 _cleanup_free_ char *v = NULL;
754 if (a->semantics && a->semantics->map_write)
755 a->semantics->map_write(a->semantics, a->value, &v);
757 fprintf(f, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
758 prefix, a->controller, a->name, v ? v : a->value);
761 if (UNIT_VTABLE(u)->dump)
762 UNIT_VTABLE(u)->dump(u, f, prefix2);
764 } else if (u->load_state == UNIT_MERGED)
766 "%s\tMerged into: %s\n",
767 prefix, u->merged_into->id);
768 else if (u->load_state == UNIT_ERROR)
769 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error));
773 job_dump(u->job, f, prefix2);
776 job_dump(u->nop_job, f, prefix2);
781 /* Common implementation for multiple backends */
782 int unit_load_fragment_and_dropin(Unit *u) {
787 /* Load a .service file */
788 if ((r = unit_load_fragment(u)) < 0)
791 if (u->load_state == UNIT_STUB)
794 /* Load drop-in directory data */
795 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
801 /* Common implementation for multiple backends */
802 int unit_load_fragment_and_dropin_optional(Unit *u) {
807 /* Same as unit_load_fragment_and_dropin(), but whether
808 * something can be loaded or not doesn't matter. */
810 /* Load a .service file */
811 if ((r = unit_load_fragment(u)) < 0)
814 if (u->load_state == UNIT_STUB)
815 u->load_state = UNIT_LOADED;
817 /* Load drop-in directory data */
818 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
824 int unit_add_default_target_dependency(Unit *u, Unit *target) {
828 if (target->type != UNIT_TARGET)
831 /* Only add the dependency if both units are loaded, so that
832 * that loop check below is reliable */
833 if (u->load_state != UNIT_LOADED ||
834 target->load_state != UNIT_LOADED)
837 /* If either side wants no automatic dependencies, then let's
839 if (!u->default_dependencies ||
840 !target->default_dependencies)
843 /* Don't create loops */
844 if (set_get(target->dependencies[UNIT_BEFORE], u))
847 return unit_add_dependency(target, UNIT_AFTER, u, true);
850 static int unit_add_default_dependencies(Unit *u) {
851 static const UnitDependency deps[] = {
853 UNIT_REQUIRED_BY_OVERRIDABLE,
865 for (k = 0; k < ELEMENTSOF(deps); k++)
866 SET_FOREACH(target, u->dependencies[deps[k]], i)
867 if ((r = unit_add_default_target_dependency(u, target)) < 0)
873 int unit_load(Unit *u) {
878 if (u->in_load_queue) {
879 LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u);
880 u->in_load_queue = false;
883 if (u->type == _UNIT_TYPE_INVALID)
886 if (u->load_state != UNIT_STUB)
889 if (UNIT_VTABLE(u)->load)
890 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
893 if (u->load_state == UNIT_STUB) {
898 if (u->load_state == UNIT_LOADED &&
899 u->default_dependencies)
900 if ((r = unit_add_default_dependencies(u)) < 0)
903 if (u->load_state == UNIT_LOADED) {
904 r = unit_add_mount_links(u);
909 if (u->on_failure_isolate &&
910 set_size(u->dependencies[UNIT_ON_FAILURE]) > 1) {
912 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
919 assert((u->load_state != UNIT_MERGED) == !u->merged_into);
921 unit_add_to_dbus_queue(unit_follow_merge(u));
922 unit_add_to_gc_queue(u);
927 u->load_state = UNIT_ERROR;
929 unit_add_to_dbus_queue(u);
930 unit_add_to_gc_queue(u);
932 log_debug("Failed to load configuration for %s: %s", u->id, strerror(-r));
937 bool unit_condition_test(Unit *u) {
940 dual_timestamp_get(&u->condition_timestamp);
941 u->condition_result = condition_test_list(u->conditions);
943 return u->condition_result;
946 static const char* unit_get_status_message_format(Unit *u, JobType t) {
947 const UnitStatusMessageFormats *format_table;
951 assert(t < _JOB_TYPE_MAX);
953 if (t != JOB_START && t != JOB_STOP)
956 format_table = &UNIT_VTABLE(u)->status_message_formats;
960 return format_table->starting_stopping[t == JOB_STOP];
963 static const char *unit_get_status_message_format_try_harder(Unit *u, JobType t) {
968 assert(t < _JOB_TYPE_MAX);
970 format = unit_get_status_message_format(u, t);
974 /* Return generic strings */
976 return "Starting %s.";
977 else if (t == JOB_STOP)
978 return "Stopping %s.";
979 else if (t == JOB_RELOAD)
980 return "Reloading %s.";
985 static void unit_status_print_starting_stopping(Unit *u, JobType t) {
990 /* We only print status messages for selected units on
991 * selected operations. */
993 format = unit_get_status_message_format(u, t);
997 unit_status_printf(u, "", format);
1000 #pragma GCC diagnostic push
1001 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
1002 static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) {
1009 if (t != JOB_START && t != JOB_STOP && t != JOB_RELOAD)
1012 if (log_on_console())
1015 /* We log status messages for all units and all operations. */
1017 format = unit_get_status_message_format_try_harder(u, t);
1021 snprintf(buf, sizeof(buf), format, unit_description(u));
1024 mid = t == JOB_START ? SD_MESSAGE_UNIT_STARTING :
1025 t == JOB_STOP ? SD_MESSAGE_UNIT_STOPPING :
1026 SD_MESSAGE_UNIT_RELOADING;
1028 log_struct_unit(LOG_INFO,
1034 #pragma GCC diagnostic pop
1037 * -EBADR: This unit type does not support starting.
1038 * -EALREADY: Unit is already started.
1039 * -EAGAIN: An operation is already in progress. Retry later.
1040 * -ECANCELED: Too many requests for now.
1042 int unit_start(Unit *u) {
1043 UnitActiveState state;
1048 if (u->load_state != UNIT_LOADED)
1051 /* If this is already started, then this will succeed. Note
1052 * that this will even succeed if this unit is not startable
1053 * by the user. This is relied on to detect when we need to
1054 * wait for units and when waiting is finished. */
1055 state = unit_active_state(u);
1056 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
1059 /* If the conditions failed, don't do anything at all. If we
1060 * already are activating this call might still be useful to
1061 * speed up activation in case there is some hold-off time,
1062 * but we don't want to recheck the condition in that case. */
1063 if (state != UNIT_ACTIVATING &&
1064 !unit_condition_test(u)) {
1065 log_debug("Starting of %s requested but condition failed. Ignoring.", u->id);
1069 /* Forward to the main object, if we aren't it. */
1070 if ((following = unit_following(u))) {
1071 log_debug("Redirecting start request from %s to %s.", u->id, following->id);
1072 return unit_start(following);
1075 unit_status_log_starting_stopping_reloading(u, JOB_START);
1076 unit_status_print_starting_stopping(u, JOB_START);
1078 /* If it is stopped, but we cannot start it, then fail */
1079 if (!UNIT_VTABLE(u)->start)
1082 /* We don't suppress calls to ->start() here when we are
1083 * already starting, to allow this request to be used as a
1084 * "hurry up" call, for example when the unit is in some "auto
1085 * restart" state where it waits for a holdoff timer to elapse
1086 * before it will start again. */
1088 unit_add_to_dbus_queue(u);
1090 return UNIT_VTABLE(u)->start(u);
1093 bool unit_can_start(Unit *u) {
1096 return !!UNIT_VTABLE(u)->start;
1099 bool unit_can_isolate(Unit *u) {
1102 return unit_can_start(u) &&
1107 * -EBADR: This unit type does not support stopping.
1108 * -EALREADY: Unit is already stopped.
1109 * -EAGAIN: An operation is already in progress. Retry later.
1111 int unit_stop(Unit *u) {
1112 UnitActiveState state;
1117 state = unit_active_state(u);
1118 if (UNIT_IS_INACTIVE_OR_FAILED(state))
1121 if ((following = unit_following(u))) {
1122 log_debug("Redirecting stop request from %s to %s.", u->id, following->id);
1123 return unit_stop(following);
1126 unit_status_log_starting_stopping_reloading(u, JOB_STOP);
1127 unit_status_print_starting_stopping(u, JOB_STOP);
1129 if (!UNIT_VTABLE(u)->stop)
1132 unit_add_to_dbus_queue(u);
1134 return UNIT_VTABLE(u)->stop(u);
1138 * -EBADR: This unit type does not support reloading.
1139 * -ENOEXEC: Unit is not started.
1140 * -EAGAIN: An operation is already in progress. Retry later.
1142 int unit_reload(Unit *u) {
1143 UnitActiveState state;
1148 if (u->load_state != UNIT_LOADED)
1151 if (!unit_can_reload(u))
1154 state = unit_active_state(u);
1155 if (state == UNIT_RELOADING)
1158 if (state != UNIT_ACTIVE)
1161 if ((following = unit_following(u))) {
1162 log_debug("Redirecting reload request from %s to %s.", u->id, following->id);
1163 return unit_reload(following);
1166 unit_status_log_starting_stopping_reloading(u, JOB_RELOAD);
1168 unit_add_to_dbus_queue(u);
1169 return UNIT_VTABLE(u)->reload(u);
1172 bool unit_can_reload(Unit *u) {
1175 if (!UNIT_VTABLE(u)->reload)
1178 if (!UNIT_VTABLE(u)->can_reload)
1181 return UNIT_VTABLE(u)->can_reload(u);
1184 static void unit_check_unneeded(Unit *u) {
1190 /* If this service shall be shut down when unneeded then do
1193 if (!u->stop_when_unneeded)
1196 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1199 SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
1200 if (unit_pending_active(other))
1203 SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1204 if (unit_pending_active(other))
1207 SET_FOREACH(other, u->dependencies[UNIT_WANTED_BY], i)
1208 if (unit_pending_active(other))
1211 SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1212 if (unit_pending_active(other))
1215 log_info("Service %s is not needed anymore. Stopping.", u->id);
1217 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1218 manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1221 static void retroactively_start_dependencies(Unit *u) {
1226 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1228 SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1229 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1230 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1231 manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1233 SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)
1234 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1235 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1236 manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1238 SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1239 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1240 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1241 manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1243 SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)
1244 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1245 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1246 manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1248 SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1249 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1250 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1251 manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1253 SET_FOREACH(other, u->dependencies[UNIT_CONFLICTS], i)
1254 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1255 manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1257 SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
1258 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1259 manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1262 static void retroactively_stop_dependencies(Unit *u) {
1267 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1269 /* Pull down units which are bound to us recursively if enabled */
1270 SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1271 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1272 manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1275 static void check_unneeded_dependencies(Unit *u) {
1280 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1282 /* Garbage collect services that might not be needed anymore, if enabled */
1283 SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1284 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1285 unit_check_unneeded(other);
1286 SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1287 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1288 unit_check_unneeded(other);
1289 SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1290 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1291 unit_check_unneeded(other);
1292 SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)
1293 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1294 unit_check_unneeded(other);
1295 SET_FOREACH(other, u->dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1296 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1297 unit_check_unneeded(other);
1298 SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)
1299 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1300 unit_check_unneeded(other);
1303 void unit_trigger_on_failure(Unit *u) {
1309 if (set_size(u->dependencies[UNIT_ON_FAILURE]) <= 0)
1312 log_info("Triggering OnFailure= dependencies of %s.", u->id);
1314 SET_FOREACH(other, u->dependencies[UNIT_ON_FAILURE], i) {
1317 if ((r = manager_add_job(u->manager, JOB_START, other, u->on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1318 log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1322 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1327 assert(os < _UNIT_ACTIVE_STATE_MAX);
1328 assert(ns < _UNIT_ACTIVE_STATE_MAX);
1330 /* Note that this is called for all low-level state changes,
1331 * even if they might map to the same high-level
1332 * UnitActiveState! That means that ns == os is OK an expected
1333 * behavior here. For example: if a mount point is remounted
1334 * this function will be called too! */
1338 if (m->n_reloading <= 0) {
1341 dual_timestamp_get(&ts);
1343 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1344 u->inactive_exit_timestamp = ts;
1345 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1346 u->inactive_enter_timestamp = ts;
1348 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1349 u->active_enter_timestamp = ts;
1350 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1351 u->active_exit_timestamp = ts;
1353 timer_unit_notify(u, ns);
1354 path_unit_notify(u, ns);
1357 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1358 cgroup_bonding_trim_list(u->cgroup_bondings, true);
1360 if (UNIT_IS_INACTIVE_OR_FAILED(os) != UNIT_IS_INACTIVE_OR_FAILED(ns)) {
1361 ExecContext *ec = unit_get_exec_context(u);
1362 if (ec && exec_context_may_touch_console(ec)) {
1363 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1373 if (u->job->state == JOB_WAITING)
1375 /* So we reached a different state for this
1376 * job. Let's see if we can run it now if it
1377 * failed previously due to EAGAIN. */
1378 job_add_to_run_queue(u->job);
1380 /* Let's check whether this state change constitutes a
1381 * finished job, or maybe contradicts a running job and
1382 * hence needs to invalidate jobs. */
1384 switch (u->job->type) {
1387 case JOB_VERIFY_ACTIVE:
1389 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1390 job_finish_and_invalidate(u->job, JOB_DONE, true);
1391 else if (u->job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1394 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1395 job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);
1401 case JOB_RELOAD_OR_START:
1403 if (u->job->state == JOB_RUNNING) {
1404 if (ns == UNIT_ACTIVE)
1405 job_finish_and_invalidate(u->job, reload_success ? JOB_DONE : JOB_FAILED, true);
1406 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1409 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1410 job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);
1418 case JOB_TRY_RESTART:
1420 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1421 job_finish_and_invalidate(u->job, JOB_DONE, true);
1422 else if (u->job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1424 job_finish_and_invalidate(u->job, JOB_FAILED, true);
1430 assert_not_reached("Job type unknown");
1436 if (m->n_reloading <= 0) {
1438 /* If this state change happened without being
1439 * requested by a job, then let's retroactively start
1440 * or stop dependencies. We skip that step when
1441 * deserializing, since we don't want to create any
1442 * additional jobs just because something is already
1446 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1447 retroactively_start_dependencies(u);
1448 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1449 retroactively_stop_dependencies(u);
1452 /* stop unneeded units regardless if going down was expected or not */
1453 if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1454 check_unneeded_dependencies(u);
1456 if (ns != os && ns == UNIT_FAILED) {
1457 log_struct_unit(LOG_NOTICE,
1459 "MESSAGE=Unit %s entered failed state", u->id,
1461 unit_trigger_on_failure(u);
1465 /* Some names are special */
1466 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1468 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1469 /* The bus just might have become available,
1470 * hence try to connect to it, if we aren't
1474 if (u->type == UNIT_SERVICE &&
1475 !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1476 m->n_reloading <= 0) {
1477 /* Write audit record if we have just finished starting up */
1478 manager_send_unit_audit(m, u, AUDIT_SERVICE_START, true);
1482 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1483 manager_send_unit_plymouth(m, u);
1487 /* We don't care about D-Bus here, since we'll get an
1488 * asynchronous notification for it anyway. */
1490 if (u->type == UNIT_SERVICE &&
1491 UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1492 !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1493 m->n_reloading <= 0) {
1495 /* Hmm, if there was no start record written
1496 * write it now, so that we always have a nice
1499 manager_send_unit_audit(m, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1501 if (ns == UNIT_INACTIVE)
1502 manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, true);
1504 /* Write audit record if we have just finished shutting down */
1505 manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1507 u->in_audit = false;
1511 manager_recheck_journal(m);
1513 /* Maybe we finished startup and are now ready for being
1514 * stopped because unneeded? */
1515 if (u->manager->n_reloading <= 0)
1516 unit_check_unneeded(u);
1518 unit_add_to_dbus_queue(u);
1519 unit_add_to_gc_queue(u);
1522 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1523 struct epoll_event ev;
1528 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1534 if (epoll_ctl(u->manager->epoll_fd,
1535 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1547 void unit_unwatch_fd(Unit *u, Watch *w) {
1551 if (w->type == WATCH_INVALID)
1554 assert(w->type == WATCH_FD);
1555 assert(w->data.unit == u);
1556 assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1559 w->type = WATCH_INVALID;
1560 w->data.unit = NULL;
1563 int unit_watch_pid(Unit *u, pid_t pid) {
1567 /* Watch a specific PID. We only support one unit watching
1568 * each PID for now. */
1570 return hashmap_put(u->manager->watch_pids, LONG_TO_PTR(pid), u);
1573 void unit_unwatch_pid(Unit *u, pid_t pid) {
1577 hashmap_remove_value(u->manager->watch_pids, LONG_TO_PTR(pid), u);
1580 int unit_watch_timer(Unit *u, clockid_t clock_id, bool relative, usec_t usec, Watch *w) {
1581 struct itimerspec its;
1587 assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1589 /* This will try to reuse the old timer if there is one */
1591 if (w->type == WATCH_UNIT_TIMER) {
1592 assert(w->data.unit == u);
1597 } else if (w->type == WATCH_INVALID) {
1600 fd = timerfd_create(clock_id, TFD_NONBLOCK|TFD_CLOEXEC);
1604 assert_not_reached("Invalid watch type");
1609 /* Set absolute time in the past, but not 0, since we
1610 * don't want to disarm the timer */
1611 its.it_value.tv_sec = 0;
1612 its.it_value.tv_nsec = 1;
1614 flags = TFD_TIMER_ABSTIME;
1616 timespec_store(&its.it_value, usec);
1617 flags = relative ? 0 : TFD_TIMER_ABSTIME;
1620 /* This will also flush the elapse counter */
1621 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1624 if (w->type == WATCH_INVALID) {
1625 struct epoll_event ev;
1629 ev.events = EPOLLIN;
1631 if (epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1635 w->type = WATCH_UNIT_TIMER;
1643 close_nointr_nofail(fd);
1648 void unit_unwatch_timer(Unit *u, Watch *w) {
1652 if (w->type == WATCH_INVALID)
1655 assert(w->type == WATCH_UNIT_TIMER);
1656 assert(w->data.unit == u);
1659 assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1660 close_nointr_nofail(w->fd);
1663 w->type = WATCH_INVALID;
1664 w->data.unit = NULL;
1667 bool unit_job_is_applicable(Unit *u, JobType j) {
1669 assert(j >= 0 && j < _JOB_TYPE_MAX);
1673 case JOB_VERIFY_ACTIVE:
1680 case JOB_TRY_RESTART:
1681 return unit_can_start(u);
1684 return unit_can_reload(u);
1686 case JOB_RELOAD_OR_START:
1687 return unit_can_reload(u) && unit_can_start(u);
1690 assert_not_reached("Invalid job type");
1694 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1696 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1697 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1698 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1699 [UNIT_WANTS] = UNIT_WANTED_BY,
1700 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1701 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1702 [UNIT_BINDS_TO] = UNIT_BOUND_BY,
1703 [UNIT_PART_OF] = UNIT_CONSISTS_OF,
1704 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1705 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1706 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1707 [UNIT_BOUND_BY] = UNIT_BINDS_TO,
1708 [UNIT_CONSISTS_OF] = UNIT_PART_OF,
1709 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1710 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1711 [UNIT_BEFORE] = UNIT_AFTER,
1712 [UNIT_AFTER] = UNIT_BEFORE,
1713 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1714 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1715 [UNIT_REFERENCED_BY] = UNIT_REFERENCES,
1716 [UNIT_TRIGGERS] = UNIT_TRIGGERED_BY,
1717 [UNIT_TRIGGERED_BY] = UNIT_TRIGGERS,
1718 [UNIT_PROPAGATES_RELOAD_TO] = UNIT_RELOAD_PROPAGATED_FROM,
1719 [UNIT_RELOAD_PROPAGATED_FROM] = UNIT_PROPAGATES_RELOAD_TO,
1721 int r, q = 0, v = 0, w = 0;
1724 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1727 u = unit_follow_merge(u);
1728 other = unit_follow_merge(other);
1730 /* We won't allow dependencies on ourselves. We will not
1731 * consider them an error however. */
1735 if ((r = set_ensure_allocated(&u->dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1738 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1739 if ((r = set_ensure_allocated(&other->dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1743 if ((r = set_ensure_allocated(&u->dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1744 (r = set_ensure_allocated(&other->dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1747 if ((q = set_put(u->dependencies[d], other)) < 0)
1750 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1751 if ((v = set_put(other->dependencies[inverse_table[d]], u)) < 0) {
1756 if (add_reference) {
1757 if ((w = set_put(u->dependencies[UNIT_REFERENCES], other)) < 0) {
1762 if ((r = set_put(other->dependencies[UNIT_REFERENCED_BY], u)) < 0)
1766 unit_add_to_dbus_queue(u);
1771 set_remove(u->dependencies[d], other);
1774 set_remove(other->dependencies[inverse_table[d]], u);
1777 set_remove(u->dependencies[UNIT_REFERENCES], other);
1782 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1787 if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1790 if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1796 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1800 assert(name || path);
1804 name = path_get_file_name(path);
1806 if (!unit_name_is_template(name)) {
1812 s = unit_name_replace_instance(name, u->instance);
1816 i = unit_name_to_prefix(u->id);
1820 s = unit_name_replace_instance(name, i);
1831 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1834 _cleanup_free_ char *s = NULL;
1837 assert(name || path);
1839 name = resolve_template(u, name, path, &s);
1843 r = manager_load_unit(u->manager, name, path, NULL, &other);
1847 return unit_add_dependency(u, d, other, add_reference);
1850 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1856 assert(name || path);
1858 if (!(name = resolve_template(u, name, path, &s)))
1861 if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1864 r = unit_add_two_dependencies(u, d, e, other, add_reference);
1871 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1877 assert(name || path);
1879 if (!(name = resolve_template(u, name, path, &s)))
1882 if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1885 r = unit_add_dependency(other, d, u, add_reference);
1892 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1898 assert(name || path);
1900 if (!(name = resolve_template(u, name, path, &s)))
1903 if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1906 if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1914 int set_unit_path(const char *p) {
1915 _cleanup_free_ char *c = NULL;
1917 /* This is mostly for debug purposes */
1918 c = path_make_absolute_cwd(p);
1919 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0)
1925 char *unit_dbus_path(Unit *u) {
1931 return unit_dbus_path_from_name(u->id);
1934 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1942 if (!b->controller) {
1943 b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1950 /* Ensure this hasn't been added yet */
1953 if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1956 l = hashmap_get(u->manager->cgroup_bondings, b->path);
1957 LIST_PREPEND(CGroupBonding, by_path, l, b);
1959 r = hashmap_replace(u->manager->cgroup_bondings, b->path, l);
1961 LIST_REMOVE(CGroupBonding, by_path, l, b);
1966 LIST_PREPEND(CGroupBonding, by_unit, u->cgroup_bondings, b);
1972 char *unit_default_cgroup_path(Unit *u) {
1976 _cleanup_free_ char *t = NULL;
1978 t = unit_name_template(u->id);
1982 return strjoin(u->manager->cgroup_hierarchy, "/", t, "/", u->instance, NULL);
1984 return strjoin(u->manager->cgroup_hierarchy, "/", u->id, NULL);
1987 int unit_add_cgroup_from_text(Unit *u, const char *name, bool overwrite, CGroupBonding **ret) {
1988 char *controller = NULL, *path = NULL;
1989 CGroupBonding *b = NULL;
1996 r = cg_split_spec(name, &controller, &path);
2001 path = unit_default_cgroup_path(u);
2006 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
2010 if (!path || !controller) {
2016 b = cgroup_bonding_find_list(u->cgroup_bondings, controller);
2018 if (streq(path, b->path)) {
2027 if (overwrite && !b->essential) {
2034 b->realized = false;
2047 b = new0(CGroupBonding, 1);
2053 b->controller = controller;
2056 b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
2058 r = unit_add_cgroup(u, b);
2075 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
2076 CGroupBonding *b = NULL;
2082 controller = SYSTEMD_CGROUP_CONTROLLER;
2084 if (cgroup_bonding_find_list(u->cgroup_bondings, controller))
2087 b = new0(CGroupBonding, 1);
2091 b->controller = strdup(controller);
2095 b->path = unit_default_cgroup_path(u);
2100 b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
2102 r = unit_add_cgroup(u, b);
2110 free(b->controller);
2116 int unit_add_default_cgroups(Unit *u) {
2123 /* Adds in the default cgroups, if they weren't specified
2126 if (!u->manager->cgroup_hierarchy)
2129 r = unit_add_one_default_cgroup(u, NULL);
2133 STRV_FOREACH(c, u->manager->default_controllers)
2134 unit_add_one_default_cgroup(u, *c);
2136 LIST_FOREACH(by_unit, a, u->cgroup_attributes)
2137 unit_add_one_default_cgroup(u, a->controller);
2142 CGroupBonding* unit_get_default_cgroup(Unit *u) {
2145 return cgroup_bonding_find_list(u->cgroup_bondings, NULL);
2148 int unit_add_cgroup_attribute(
2150 const CGroupSemantics *semantics,
2151 const char *controller,
2154 CGroupAttribute **ret) {
2156 _cleanup_free_ char *c = NULL;
2164 /* Semantics always take precedence */
2165 if (semantics->name)
2166 name = semantics->name;
2168 if (semantics->controller)
2169 controller = semantics->controller;
2176 r = cg_controller_from_attr(name, &c);
2183 if (!controller || streq(controller, SYSTEMD_CGROUP_CONTROLLER))
2186 if (!filename_is_safe(name))
2189 if (!filename_is_safe(controller))
2192 /* Check if this attribute already exists. Note that we will
2193 * explicitly check for the value here too, as there are
2194 * attributes which accept multiple values. */
2195 a = cgroup_attribute_find_list(u->cgroup_attributes, controller, name);
2197 if (streq(value, a->value)) {
2198 /* Exactly the same value is always OK, let's ignore this */
2205 if (semantics && !semantics->multiple) {
2208 /* If this is a single-item entry, we can
2209 * simply patch the existing attribute */
2224 a = new0(CGroupAttribute, 1);
2232 a->controller = strdup(controller);
2234 a->name = strdup(name);
2235 a->value = strdup(value);
2237 if (!a->controller || !a->name || !a->value) {
2238 free(a->controller);
2245 a->semantics = semantics;
2248 LIST_PREPEND(CGroupAttribute, by_unit, u->cgroup_attributes, a);
2256 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
2264 if (!(t = unit_name_change_suffix(u->id, type)))
2267 assert(!unit_has_name(u, t));
2269 r = manager_load_unit(u->manager, t, NULL, NULL, _found);
2272 assert(r < 0 || *_found != u);
2277 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
2285 if (!(t = unit_name_change_suffix(u->id, type)))
2288 assert(!unit_has_name(u, t));
2290 found = manager_get_unit(u->manager, t);
2300 int unit_watch_bus_name(Unit *u, const char *name) {
2304 /* Watch a specific name on the bus. We only support one unit
2305 * watching each name for now. */
2307 return hashmap_put(u->manager->watch_bus, name, u);
2310 void unit_unwatch_bus_name(Unit *u, const char *name) {
2314 hashmap_remove_value(u->manager->watch_bus, name, u);
2317 bool unit_can_serialize(Unit *u) {
2320 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2323 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs) {
2330 if (!unit_can_serialize(u))
2333 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2337 if (serialize_jobs) {
2339 fprintf(f, "job\n");
2340 job_serialize(u->job, f, fds);
2344 fprintf(f, "job\n");
2345 job_serialize(u->nop_job, f, fds);
2349 dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->inactive_exit_timestamp);
2350 dual_timestamp_serialize(f, "active-enter-timestamp", &u->active_enter_timestamp);
2351 dual_timestamp_serialize(f, "active-exit-timestamp", &u->active_exit_timestamp);
2352 dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->inactive_enter_timestamp);
2353 dual_timestamp_serialize(f, "condition-timestamp", &u->condition_timestamp);
2355 if (dual_timestamp_is_set(&u->condition_timestamp))
2356 unit_serialize_item(u, f, "condition-result", yes_no(u->condition_result));
2363 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2374 va_start(ap, format);
2375 vfprintf(f, format, ap);
2381 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2387 fprintf(f, "%s=%s\n", key, value);
2390 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2397 if (!unit_can_serialize(u))
2401 char line[LINE_MAX], *l, *v;
2404 if (!fgets(line, sizeof(line), f)) {
2417 k = strcspn(l, "=");
2425 if (streq(l, "job")) {
2427 /* new-style serialized job */
2428 Job *j = job_new_raw(u);
2432 r = job_deserialize(j, f, fds);
2438 r = hashmap_put(u->manager->jobs, UINT32_TO_PTR(j->id), j);
2444 r = job_install_deserialized(j);
2446 hashmap_remove(u->manager->jobs, UINT32_TO_PTR(j->id));
2451 if (j->state == JOB_RUNNING)
2452 u->manager->n_running_jobs++;
2455 JobType type = job_type_from_string(v);
2457 log_debug("Failed to parse job type value %s", v);
2459 u->deserialized_job = type;
2462 } else if (streq(l, "inactive-exit-timestamp")) {
2463 dual_timestamp_deserialize(v, &u->inactive_exit_timestamp);
2465 } else if (streq(l, "active-enter-timestamp")) {
2466 dual_timestamp_deserialize(v, &u->active_enter_timestamp);
2468 } else if (streq(l, "active-exit-timestamp")) {
2469 dual_timestamp_deserialize(v, &u->active_exit_timestamp);
2471 } else if (streq(l, "inactive-enter-timestamp")) {
2472 dual_timestamp_deserialize(v, &u->inactive_enter_timestamp);
2474 } else if (streq(l, "condition-timestamp")) {
2475 dual_timestamp_deserialize(v, &u->condition_timestamp);
2477 } else if (streq(l, "condition-result")) {
2480 if ((b = parse_boolean(v)) < 0)
2481 log_debug("Failed to parse condition result value %s", v);
2483 u->condition_result = b;
2488 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2493 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2503 /* Adds in links to the device node that this unit is based on */
2505 if (!is_device_path(what))
2508 e = unit_name_from_path(what, ".device");
2512 r = manager_load_unit(u->manager, e, NULL, NULL, &device);
2517 r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BINDS_TO, device, true);
2522 r = unit_add_dependency(device, UNIT_WANTS, u, false);
2530 int unit_coldplug(Unit *u) {
2535 if (UNIT_VTABLE(u)->coldplug)
2536 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2540 r = job_coldplug(u->job);
2543 } else if (u->deserialized_job >= 0) {
2545 r = manager_add_job(u->manager, u->deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL);
2549 u->deserialized_job = _JOB_TYPE_INVALID;
2555 void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) {
2556 manager_status_printf(u->manager, false, status, unit_status_msg_format, unit_description(u));
2559 bool unit_need_daemon_reload(Unit *u) {
2564 if (u->fragment_path) {
2566 if (stat(u->fragment_path, &st) < 0)
2567 /* What, cannot access this anymore? */
2570 if (u->fragment_mtime > 0 &&
2571 timespec_load(&st.st_mtim) != u->fragment_mtime)
2575 if (u->source_path) {
2577 if (stat(u->source_path, &st) < 0)
2580 if (u->source_mtime > 0 &&
2581 timespec_load(&st.st_mtim) != u->source_mtime)
2588 void unit_reset_failed(Unit *u) {
2591 if (UNIT_VTABLE(u)->reset_failed)
2592 UNIT_VTABLE(u)->reset_failed(u);
2595 Unit *unit_following(Unit *u) {
2598 if (UNIT_VTABLE(u)->following)
2599 return UNIT_VTABLE(u)->following(u);
2604 bool unit_pending_inactive(Unit *u) {
2607 /* Returns true if the unit is inactive or going down */
2609 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2612 if (u->job && u->job->type == JOB_STOP)
2618 bool unit_pending_active(Unit *u) {
2621 /* Returns true if the unit is active or going up */
2623 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2627 (u->job->type == JOB_START ||
2628 u->job->type == JOB_RELOAD_OR_START ||
2629 u->job->type == JOB_RESTART))
2635 int unit_kill(Unit *u, KillWho w, int signo, DBusError *error) {
2637 assert(w >= 0 && w < _KILL_WHO_MAX);
2639 assert(signo < _NSIG);
2641 if (!UNIT_VTABLE(u)->kill)
2644 return UNIT_VTABLE(u)->kill(u, w, signo, error);
2647 int unit_following_set(Unit *u, Set **s) {
2651 if (UNIT_VTABLE(u)->following_set)
2652 return UNIT_VTABLE(u)->following_set(u, s);
2658 UnitFileState unit_get_unit_file_state(Unit *u) {
2661 if (u->unit_file_state < 0 && u->fragment_path)
2662 u->unit_file_state = unit_file_get_state(
2663 u->manager->running_as == SYSTEMD_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
2664 NULL, path_get_file_name(u->fragment_path));
2666 return u->unit_file_state;
2669 Unit* unit_ref_set(UnitRef *ref, Unit *u) {
2674 unit_ref_unset(ref);
2677 LIST_PREPEND(UnitRef, refs, u->refs, ref);
2681 void unit_ref_unset(UnitRef *ref) {
2687 LIST_REMOVE(UnitRef, refs, ref->unit->refs, ref);
2691 int unit_add_one_mount_link(Unit *u, Mount *m) {
2697 if (u->load_state != UNIT_LOADED ||
2698 UNIT(m)->load_state != UNIT_LOADED)
2701 STRV_FOREACH(i, u->requires_mounts_for) {
2706 if (!path_startswith(*i, m->where))
2709 return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
2715 int unit_add_mount_links(Unit *u) {
2721 LIST_FOREACH(units_by_type, other, u->manager->units_by_type[UNIT_MOUNT]) {
2722 r = unit_add_one_mount_link(u, MOUNT(other));
2730 int unit_exec_context_defaults(Unit *u, ExecContext *c) {
2737 /* This only copies in the ones that need memory */
2739 for (i = 0; i < RLIMIT_NLIMITS; i++)
2740 if (u->manager->rlimit[i] && !c->rlimit[i]) {
2741 c->rlimit[i] = newdup(struct rlimit, u->manager->rlimit[i], 1);
2746 if (u->manager->running_as == SYSTEMD_USER &&
2747 !c->working_directory) {
2749 r = get_home_dir(&c->working_directory);
2757 ExecContext *unit_get_exec_context(Unit *u) {
2761 offset = UNIT_VTABLE(u)->exec_context_offset;
2765 return (ExecContext*) ((uint8_t*) u + offset);
2768 static int drop_in_file(Unit *u, bool runtime, const char *name, char **_p, char **_q) {
2777 if (u->manager->running_as == SYSTEMD_USER && runtime)
2780 if (!filename_is_safe(name))
2783 if (u->manager->running_as == SYSTEMD_USER) {
2784 _cleanup_free_ char *c = NULL;
2786 r = user_config_home(&c);
2792 p = strjoin(c, "/", u->id, ".d", NULL);
2794 p = strjoin("/run/systemd/system/", u->id, ".d", NULL);
2796 p = strjoin("/etc/systemd/system/", u->id, ".d", NULL);
2800 q = strjoin(p, "/50-", name, ".conf", NULL);
2811 int unit_write_drop_in(Unit *u, bool runtime, const char *name, const char *data) {
2812 _cleanup_free_ char *p = NULL, *q = NULL;
2817 r = drop_in_file(u, runtime, name, &p, &q);
2822 return write_one_line_file_atomic_label(q, data);
2825 int unit_remove_drop_in(Unit *u, bool runtime, const char *name) {
2826 _cleanup_free_ char *p = NULL, *q = NULL;
2831 r = drop_in_file(u, runtime, name, &p, &q);
2841 int unit_kill_context(
2847 bool main_pid_alien) {
2849 int sig, wait_for_exit = 0, r;
2854 if (c->kill_mode == KILL_NONE)
2857 sig = sigkill ? SIGKILL : c->kill_signal;
2860 r = kill_and_sigcont(main_pid, sig);
2862 if (r < 0 && r != -ESRCH) {
2863 _cleanup_free_ char *comm = NULL;
2864 get_process_comm(main_pid, &comm);
2866 log_warning_unit(u->id, "Failed to kill main process %li (%s): %s",
2867 (long) main_pid, strna(comm), strerror(-r));
2869 wait_for_exit = !main_pid_alien;
2872 if (control_pid > 0) {
2873 r = kill_and_sigcont(control_pid, sig);
2875 if (r < 0 && r != -ESRCH) {
2876 _cleanup_free_ char *comm = NULL;
2877 get_process_comm(control_pid, &comm);
2879 log_warning_unit(u->id,
2880 "Failed to kill control process %li (%s): %s",
2881 (long) control_pid, strna(comm), strerror(-r));
2883 wait_for_exit = true;
2886 if (c->kill_mode == KILL_CONTROL_GROUP) {
2887 _cleanup_set_free_ Set *pid_set = NULL;
2889 pid_set = set_new(trivial_hash_func, trivial_compare_func);
2893 /* Exclude the main/control pids from being killed via the cgroup */
2895 r = set_put(pid_set, LONG_TO_PTR(main_pid));
2900 if (control_pid > 0) {
2901 r = set_put(pid_set, LONG_TO_PTR(control_pid));
2906 r = cgroup_bonding_kill_list(u->cgroup_bondings, sig, true, false, pid_set, NULL);
2908 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
2909 log_warning_unit(u->id, "Failed to kill control group: %s", strerror(-r));
2911 wait_for_exit = true;
2914 return wait_for_exit;
2917 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2918 [UNIT_ACTIVE] = "active",
2919 [UNIT_RELOADING] = "reloading",
2920 [UNIT_INACTIVE] = "inactive",
2921 [UNIT_FAILED] = "failed",
2922 [UNIT_ACTIVATING] = "activating",
2923 [UNIT_DEACTIVATING] = "deactivating"
2926 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2928 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2929 [UNIT_REQUIRES] = "Requires",
2930 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2931 [UNIT_REQUISITE] = "Requisite",
2932 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2933 [UNIT_WANTS] = "Wants",
2934 [UNIT_BINDS_TO] = "BindsTo",
2935 [UNIT_PART_OF] = "PartOf",
2936 [UNIT_REQUIRED_BY] = "RequiredBy",
2937 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2938 [UNIT_WANTED_BY] = "WantedBy",
2939 [UNIT_BOUND_BY] = "BoundBy",
2940 [UNIT_CONSISTS_OF] = "ConsistsOf",
2941 [UNIT_CONFLICTS] = "Conflicts",
2942 [UNIT_CONFLICTED_BY] = "ConflictedBy",
2943 [UNIT_BEFORE] = "Before",
2944 [UNIT_AFTER] = "After",
2945 [UNIT_ON_FAILURE] = "OnFailure",
2946 [UNIT_TRIGGERS] = "Triggers",
2947 [UNIT_TRIGGERED_BY] = "TriggeredBy",
2948 [UNIT_PROPAGATES_RELOAD_TO] = "PropagatesReloadTo",
2949 [UNIT_RELOAD_PROPAGATED_FROM] = "ReloadPropagatedFrom",
2950 [UNIT_REFERENCES] = "References",
2951 [UNIT_REFERENCED_BY] = "ReferencedBy",
2954 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);