1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/epoll.h>
26 #include <sys/timerfd.h>
36 #include "load-fragment.h"
37 #include "load-dropin.h"
39 #include "unit-name.h"
40 #include "specifier.h"
41 #include "dbus-unit.h"
43 #include "cgroup-util.h"
46 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
47 [UNIT_SERVICE] = &service_vtable,
48 [UNIT_TIMER] = &timer_vtable,
49 [UNIT_SOCKET] = &socket_vtable,
50 [UNIT_TARGET] = &target_vtable,
51 [UNIT_DEVICE] = &device_vtable,
52 [UNIT_MOUNT] = &mount_vtable,
53 [UNIT_AUTOMOUNT] = &automount_vtable,
54 [UNIT_SNAPSHOT] = &snapshot_vtable,
55 [UNIT_SWAP] = &swap_vtable,
56 [UNIT_PATH] = &path_vtable
59 Unit *unit_new(Manager *m) {
64 if (!(u = new0(Unit, 1)))
67 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
73 u->meta.type = _UNIT_TYPE_INVALID;
74 u->meta.deserialized_job = _JOB_TYPE_INVALID;
75 u->meta.default_dependencies = true;
80 bool unit_has_name(Unit *u, const char *name) {
84 return !!set_get(u->meta.names, (char*) name);
87 int unit_add_name(Unit *u, const char *text) {
95 if (unit_name_is_template(text)) {
96 if (!u->meta.instance)
99 s = unit_name_replace_instance(text, u->meta.instance);
106 if (!unit_name_is_valid(s, false)) {
111 assert_se((t = unit_name_to_type(s)) >= 0);
113 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
118 if ((r = unit_name_to_instance(s, &i)) < 0)
121 if (i && unit_vtable[t]->no_instances)
124 /* Ensure that this unit is either instanced or not instanced,
126 if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
131 if (unit_vtable[t]->no_alias &&
132 !set_isempty(u->meta.names) &&
133 !set_get(u->meta.names, s)) {
138 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
143 if ((r = set_put(u->meta.names, s)) < 0) {
149 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
150 set_remove(u->meta.names, s);
154 if (u->meta.type == _UNIT_TYPE_INVALID) {
158 u->meta.instance = i;
160 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
162 if (UNIT_VTABLE(u)->init)
163 UNIT_VTABLE(u)->init(u);
167 unit_add_to_dbus_queue(u);
177 int unit_choose_id(Unit *u, const char *name) {
178 char *s, *t = NULL, *i;
184 if (unit_name_is_template(name)) {
186 if (!u->meta.instance)
189 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
195 /* Selects one of the names of this unit as the id */
196 s = set_get(u->meta.names, (char*) name);
202 if ((r = unit_name_to_instance(s, &i)) < 0)
207 free(u->meta.instance);
208 u->meta.instance = i;
210 unit_add_to_dbus_queue(u);
215 int unit_set_description(Unit *u, const char *description) {
220 if (!(s = strdup(description)))
223 free(u->meta.description);
224 u->meta.description = s;
226 unit_add_to_dbus_queue(u);
230 bool unit_check_gc(Unit *u) {
233 if (u->meta.load_state == UNIT_STUB)
236 if (UNIT_VTABLE(u)->no_gc)
245 if (unit_active_state(u) != UNIT_INACTIVE)
248 if (UNIT_VTABLE(u)->check_gc)
249 if (UNIT_VTABLE(u)->check_gc(u))
255 void unit_add_to_load_queue(Unit *u) {
257 assert(u->meta.type != _UNIT_TYPE_INVALID);
259 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
262 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
263 u->meta.in_load_queue = true;
266 void unit_add_to_cleanup_queue(Unit *u) {
269 if (u->meta.in_cleanup_queue)
272 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
273 u->meta.in_cleanup_queue = true;
276 void unit_add_to_gc_queue(Unit *u) {
279 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
282 if (unit_check_gc(u))
285 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
286 u->meta.in_gc_queue = true;
288 u->meta.manager->n_in_gc_queue ++;
290 if (u->meta.manager->gc_queue_timestamp <= 0)
291 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
294 void unit_add_to_dbus_queue(Unit *u) {
296 assert(u->meta.type != _UNIT_TYPE_INVALID);
298 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
301 /* Shortcut things if nobody cares */
302 if (!bus_has_subscriber(u->meta.manager)) {
303 u->meta.sent_dbus_new_signal = true;
307 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
308 u->meta.in_dbus_queue = true;
311 static void bidi_set_free(Unit *u, Set *s) {
317 /* Frees the set and makes sure we are dropped from the
318 * inverse pointers */
320 SET_FOREACH(other, s, i) {
323 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
324 set_remove(other->meta.dependencies[d], u);
326 unit_add_to_gc_queue(other);
332 void unit_free(Unit *u) {
339 bus_unit_send_removed_signal(u);
341 if (u->meta.load_state != UNIT_STUB)
342 if (UNIT_VTABLE(u)->done)
343 UNIT_VTABLE(u)->done(u);
345 SET_FOREACH(t, u->meta.names, i)
346 hashmap_remove_value(u->meta.manager->units, t, u);
349 job_free(u->meta.job);
351 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
352 bidi_set_free(u, u->meta.dependencies[d]);
354 if (u->meta.type != _UNIT_TYPE_INVALID)
355 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
357 if (u->meta.in_load_queue)
358 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
360 if (u->meta.in_dbus_queue)
361 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
363 if (u->meta.in_cleanup_queue)
364 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
366 if (u->meta.in_gc_queue) {
367 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
368 u->meta.manager->n_in_gc_queue--;
371 cgroup_bonding_free_list(u->meta.cgroup_bondings);
373 free(u->meta.description);
374 free(u->meta.fragment_path);
376 set_free_free(u->meta.names);
378 condition_free_list(u->meta.conditions);
380 free(u->meta.instance);
384 UnitActiveState unit_active_state(Unit *u) {
387 if (u->meta.load_state == UNIT_MERGED)
388 return unit_active_state(unit_follow_merge(u));
390 /* After a reload it might happen that a unit is not correctly
391 * loaded but still has a process around. That's why we won't
392 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
394 return UNIT_VTABLE(u)->active_state(u);
397 const char* unit_sub_state_to_string(Unit *u) {
400 return UNIT_VTABLE(u)->sub_state_to_string(u);
403 static void complete_move(Set **s, Set **other) {
411 set_move(*s, *other);
418 static void merge_names(Unit *u, Unit *other) {
425 complete_move(&u->meta.names, &other->meta.names);
427 set_free_free(other->meta.names);
428 other->meta.names = NULL;
429 other->meta.id = NULL;
431 SET_FOREACH(t, u->meta.names, i)
432 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
435 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
442 assert(d < _UNIT_DEPENDENCY_MAX);
444 /* Fix backwards pointers */
445 SET_FOREACH(back, other->meta.dependencies[d], i) {
448 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
449 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
452 set_remove(back->meta.dependencies[k], other);
454 assert(r == -ENOENT);
458 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
460 set_free(other->meta.dependencies[d]);
461 other->meta.dependencies[d] = NULL;
464 int unit_merge(Unit *u, Unit *other) {
469 assert(u->meta.manager == other->meta.manager);
470 assert(u->meta.type != _UNIT_TYPE_INVALID);
472 other = unit_follow_merge(other);
477 if (u->meta.type != other->meta.type)
480 if (!u->meta.instance != !other->meta.instance)
483 if (other->meta.load_state != UNIT_STUB &&
484 other->meta.load_state != UNIT_ERROR)
490 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
494 merge_names(u, other);
496 /* Merge dependencies */
497 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
498 merge_dependencies(u, other, d);
500 other->meta.load_state = UNIT_MERGED;
501 other->meta.merged_into = u;
503 /* If there is still some data attached to the other node, we
504 * don't need it anymore, and can free it. */
505 if (other->meta.load_state != UNIT_STUB)
506 if (UNIT_VTABLE(other)->done)
507 UNIT_VTABLE(other)->done(other);
509 unit_add_to_dbus_queue(u);
510 unit_add_to_cleanup_queue(other);
515 int unit_merge_by_name(Unit *u, const char *name) {
523 if (unit_name_is_template(name)) {
524 if (!u->meta.instance)
527 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
533 if (!(other = manager_get_unit(u->meta.manager, name)))
534 r = unit_add_name(u, name);
536 r = unit_merge(u, other);
542 Unit* unit_follow_merge(Unit *u) {
545 while (u->meta.load_state == UNIT_MERGED)
546 assert_se(u = u->meta.merged_into);
551 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
557 if (c->std_output != EXEC_OUTPUT_KMSG &&
558 c->std_output != EXEC_OUTPUT_SYSLOG &&
559 c->std_error != EXEC_OUTPUT_KMSG &&
560 c->std_error != EXEC_OUTPUT_SYSLOG)
563 /* If syslog or kernel logging is requested, make sure our own
564 * logging daemon is run first. */
566 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
569 if (u->meta.manager->running_as == MANAGER_SYSTEM)
570 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
576 const char *unit_description(Unit *u) {
579 if (u->meta.description)
580 return u->meta.description;
582 return strna(u->meta.id);
585 void unit_dump(Unit *u, FILE *f, const char *prefix) {
593 timestamp1[FORMAT_TIMESTAMP_MAX],
594 timestamp2[FORMAT_TIMESTAMP_MAX],
595 timestamp3[FORMAT_TIMESTAMP_MAX],
596 timestamp4[FORMAT_TIMESTAMP_MAX],
597 timespan[FORMAT_TIMESPAN_MAX];
601 assert(u->meta.type >= 0);
605 p2 = strappend(prefix, "\t");
606 prefix2 = p2 ? p2 : prefix;
610 "%s\tDescription: %s\n"
612 "%s\tUnit Load State: %s\n"
613 "%s\tUnit Active State: %s\n"
614 "%s\tInactive Exit Timestamp: %s\n"
615 "%s\tActive Enter Timestamp: %s\n"
616 "%s\tActive Exit Timestamp: %s\n"
617 "%s\tInactive Enter Timestamp: %s\n"
618 "%s\tGC Check Good: %s\n"
619 "%s\tNeed Daemon Reload: %s\n",
621 prefix, unit_description(u),
622 prefix, strna(u->meta.instance),
623 prefix, unit_load_state_to_string(u->meta.load_state),
624 prefix, unit_active_state_to_string(unit_active_state(u)),
625 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
626 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
627 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
628 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
629 prefix, yes_no(unit_check_gc(u)),
630 prefix, yes_no(unit_need_daemon_reload(u)));
632 SET_FOREACH(t, u->meta.names, i)
633 fprintf(f, "%s\tName: %s\n", prefix, t);
635 if ((following = unit_following(u)))
636 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
638 if (u->meta.fragment_path)
639 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
641 if (u->meta.job_timeout > 0)
642 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
644 condition_dump_list(u->meta.conditions, f, prefix);
646 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
649 SET_FOREACH(other, u->meta.dependencies[d], i)
650 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
653 if (u->meta.load_state == UNIT_LOADED) {
655 "%s\tRecursive Stop: %s\n"
656 "%s\tStopWhenUnneeded: %s\n"
657 "%s\tRefuseManualStart: %s\n"
658 "%s\tRefuseManualStop: %s\n"
659 "%s\tDefaultDependencies: %s\n"
660 "%s\tIgnoreDependencyFailure: %s\n",
661 prefix, yes_no(u->meta.recursive_stop),
662 prefix, yes_no(u->meta.stop_when_unneeded),
663 prefix, yes_no(u->meta.refuse_manual_start),
664 prefix, yes_no(u->meta.refuse_manual_stop),
665 prefix, yes_no(u->meta.default_dependencies),
666 prefix, yes_no(u->meta.ignore_dependency_failure));
668 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
669 fprintf(f, "%s\tControlGroup: %s:%s\n",
670 prefix, b->controller, b->path);
672 if (UNIT_VTABLE(u)->dump)
673 UNIT_VTABLE(u)->dump(u, f, prefix2);
675 } else if (u->meta.load_state == UNIT_MERGED)
677 "%s\tMerged into: %s\n",
678 prefix, u->meta.merged_into->meta.id);
679 else if (u->meta.load_state == UNIT_ERROR)
680 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
684 job_dump(u->meta.job, f, prefix2);
689 /* Common implementation for multiple backends */
690 int unit_load_fragment_and_dropin(Unit *u) {
695 /* Load a .service file */
696 if ((r = unit_load_fragment(u)) < 0)
699 if (u->meta.load_state == UNIT_STUB)
702 /* Load drop-in directory data */
703 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
709 /* Common implementation for multiple backends */
710 int unit_load_fragment_and_dropin_optional(Unit *u) {
715 /* Same as unit_load_fragment_and_dropin(), but whether
716 * something can be loaded or not doesn't matter. */
718 /* Load a .service file */
719 if ((r = unit_load_fragment(u)) < 0)
722 if (u->meta.load_state == UNIT_STUB)
723 u->meta.load_state = UNIT_LOADED;
725 /* Load drop-in directory data */
726 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
732 int unit_add_default_target_dependency(Unit *u, Unit *target) {
736 if (target->meta.type != UNIT_TARGET)
739 /* Only add the dependency if boths units are loaded, so that
740 * that loop check below is reliable */
741 if (u->meta.load_state != UNIT_LOADED ||
742 target->meta.load_state != UNIT_LOADED)
745 /* Don't create loops */
746 if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
749 return unit_add_dependency(target, UNIT_AFTER, u, true);
752 static int unit_add_default_dependencies(Unit *u) {
759 SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY], i)
760 if ((r = unit_add_default_target_dependency(u, target)) < 0)
763 SET_FOREACH(target, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
764 if ((r = unit_add_default_target_dependency(u, target)) < 0)
767 SET_FOREACH(target, u->meta.dependencies[UNIT_WANTED_BY], i)
768 if ((r = unit_add_default_target_dependency(u, target)) < 0)
774 int unit_load(Unit *u) {
779 if (u->meta.in_load_queue) {
780 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
781 u->meta.in_load_queue = false;
784 if (u->meta.type == _UNIT_TYPE_INVALID)
787 if (u->meta.load_state != UNIT_STUB)
790 if (UNIT_VTABLE(u)->load)
791 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
794 if (u->meta.load_state == UNIT_STUB) {
799 if (u->meta.load_state == UNIT_LOADED &&
800 u->meta.default_dependencies)
801 if ((r = unit_add_default_dependencies(u)) < 0)
804 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
806 unit_add_to_dbus_queue(unit_follow_merge(u));
807 unit_add_to_gc_queue(u);
812 u->meta.load_state = UNIT_ERROR;
813 u->meta.load_error = r;
814 unit_add_to_dbus_queue(u);
816 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
822 * -EBADR: This unit type does not support starting.
823 * -EALREADY: Unit is already started.
824 * -EAGAIN: An operation is already in progress. Retry later.
825 * -ECANCELED: Too many requests for now.
827 int unit_start(Unit *u) {
828 UnitActiveState state;
832 if (u->meta.load_state != UNIT_LOADED)
835 /* If this is already (being) started, then this will
836 * succeed. Note that this will even succeed if this unit is
837 * not startable by the user. This is relied on to detect when
838 * we need to wait for units and when waiting is finished. */
839 state = unit_active_state(u);
840 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
843 /* If it is stopped, but we cannot start it, then fail */
844 if (!UNIT_VTABLE(u)->start)
847 /* If the conditions failed, don't do anything at all */
848 if (!condition_test_list(u->meta.conditions)) {
849 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
853 /* We don't suppress calls to ->start() here when we are
854 * already starting, to allow this request to be used as a
855 * "hurry up" call, for example when the unit is in some "auto
856 * restart" state where it waits for a holdoff timer to elapse
857 * before it will start again. */
859 unit_add_to_dbus_queue(u);
861 unit_status_printf(u, "Starting %s...\n", unit_description(u));
863 return UNIT_VTABLE(u)->start(u);
866 bool unit_can_start(Unit *u) {
869 return !!UNIT_VTABLE(u)->start;
872 bool unit_can_isolate(Unit *u) {
875 return unit_can_start(u) &&
876 u->meta.allow_isolate;
880 * -EBADR: This unit type does not support stopping.
881 * -EALREADY: Unit is already stopped.
882 * -EAGAIN: An operation is already in progress. Retry later.
884 int unit_stop(Unit *u) {
885 UnitActiveState state;
889 state = unit_active_state(u);
890 if (UNIT_IS_INACTIVE_OR_FAILED(state))
893 if (!UNIT_VTABLE(u)->stop)
896 unit_add_to_dbus_queue(u);
898 unit_status_printf(u, "Stopping %s...\n", unit_description(u));
900 return UNIT_VTABLE(u)->stop(u);
904 * -EBADR: This unit type does not support reloading.
905 * -ENOEXEC: Unit is not started.
906 * -EAGAIN: An operation is already in progress. Retry later.
908 int unit_reload(Unit *u) {
909 UnitActiveState state;
913 if (u->meta.load_state != UNIT_LOADED)
916 if (!unit_can_reload(u))
919 state = unit_active_state(u);
920 if (state == UNIT_RELOADING)
923 if (state != UNIT_ACTIVE)
926 unit_add_to_dbus_queue(u);
927 return UNIT_VTABLE(u)->reload(u);
930 bool unit_can_reload(Unit *u) {
933 if (!UNIT_VTABLE(u)->reload)
936 if (!UNIT_VTABLE(u)->can_reload)
939 return UNIT_VTABLE(u)->can_reload(u);
942 static void unit_check_unneeded(Unit *u) {
948 /* If this service shall be shut down when unneeded then do
951 if (!u->meta.stop_when_unneeded)
954 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
957 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
958 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
961 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
962 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
965 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
966 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
969 log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
971 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
972 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
975 static void retroactively_start_dependencies(Unit *u) {
980 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
982 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
983 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
984 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
986 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
987 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
988 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
990 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
991 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
992 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
994 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
995 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
996 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
998 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
999 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1000 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1002 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1003 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1004 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1007 static void retroactively_stop_dependencies(Unit *u) {
1012 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1014 if (u->meta.recursive_stop) {
1015 /* Pull down units need us recursively if enabled */
1016 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1017 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1018 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1021 /* Garbage collect services that might not be needed anymore, if enabled */
1022 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1023 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1024 unit_check_unneeded(other);
1025 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1026 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1027 unit_check_unneeded(other);
1028 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1029 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1030 unit_check_unneeded(other);
1031 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1032 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1033 unit_check_unneeded(other);
1034 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1035 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1036 unit_check_unneeded(other);
1039 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
1044 assert(os < _UNIT_ACTIVE_STATE_MAX);
1045 assert(ns < _UNIT_ACTIVE_STATE_MAX);
1047 /* Note that this is called for all low-level state changes,
1048 * even if they might map to the same high-level
1049 * UnitActiveState! That means that ns == os is OK an expected
1050 * behaviour here. For example: if a mount point is remounted
1051 * this function will be called too! */
1053 dual_timestamp_get(&ts);
1055 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1056 u->meta.inactive_exit_timestamp = ts;
1057 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1058 u->meta.inactive_enter_timestamp = ts;
1060 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1061 u->meta.active_enter_timestamp = ts;
1062 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1063 u->meta.active_exit_timestamp = ts;
1065 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1066 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1068 timer_unit_notify(u, ns);
1069 path_unit_notify(u, ns);
1074 if (u->meta.job->state == JOB_WAITING)
1076 /* So we reached a different state for this
1077 * job. Let's see if we can run it now if it
1078 * failed previously due to EAGAIN. */
1079 job_add_to_run_queue(u->meta.job);
1081 /* Let's check whether this state change constitutes a
1082 * finished job, or maybe cotradicts a running job and
1083 * hence needs to invalidate jobs. */
1085 switch (u->meta.job->type) {
1088 case JOB_VERIFY_ACTIVE:
1090 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1091 job_finish_and_invalidate(u->meta.job, true);
1092 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1095 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1096 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1102 case JOB_RELOAD_OR_START:
1104 if (u->meta.job->state == JOB_RUNNING) {
1105 if (ns == UNIT_ACTIVE)
1106 job_finish_and_invalidate(u->meta.job, true);
1107 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1110 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1111 job_finish_and_invalidate(u->meta.job, ns != UNIT_FAILED);
1119 case JOB_TRY_RESTART:
1121 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1122 job_finish_and_invalidate(u->meta.job, true);
1123 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1125 job_finish_and_invalidate(u->meta.job, false);
1131 assert_not_reached("Job type unknown");
1137 /* If this state change happened without being requested by a
1138 * job, then let's retroactively start or stop
1139 * dependencies. We skip that step when deserializing, since
1140 * we don't want to create any additional jobs just because
1141 * something is already activated. */
1143 if (unexpected && u->meta.manager->n_deserializing <= 0) {
1144 if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1145 retroactively_start_dependencies(u);
1146 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1147 retroactively_stop_dependencies(u);
1150 if (ns != os && ns == UNIT_FAILED) {
1154 SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i)
1155 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1157 log_notice("Unit %s entered failed state.", u->meta.id);
1160 /* Some names are special */
1161 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1162 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1163 /* The bus just might have become available,
1164 * hence try to connect to it, if we aren't
1166 bus_init(u->meta.manager);
1168 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1169 /* The syslog daemon just might have become
1170 * available, hence try to connect to it, if
1171 * we aren't yet connected. */
1174 if (u->meta.type == UNIT_SERVICE &&
1175 !UNIT_IS_ACTIVE_OR_RELOADING(os)) {
1176 /* Write audit record if we have just finished starting up */
1177 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1178 u->meta.in_audit = true;
1181 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1182 manager_send_unit_plymouth(u->meta.manager, u);
1186 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1187 /* The syslog daemon might just have
1188 * terminated, hence try to disconnect from
1192 /* We don't care about D-Bus here, since we'll get an
1193 * asynchronous notification for it anyway. */
1195 if (u->meta.type == UNIT_SERVICE &&
1196 UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1197 !UNIT_IS_INACTIVE_OR_FAILED(os)) {
1199 /* Hmm, if there was no start record written
1200 * write it now, so that we always have a nice
1202 if (!u->meta.in_audit) {
1203 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1205 if (ns == UNIT_INACTIVE)
1206 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1208 /* Write audit record if we have just finished shutting down */
1209 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1211 u->meta.in_audit = false;
1215 /* Maybe we finished startup and are now ready for being
1216 * stopped because unneeded? */
1217 unit_check_unneeded(u);
1219 unit_add_to_dbus_queue(u);
1220 unit_add_to_gc_queue(u);
1223 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1224 struct epoll_event ev;
1229 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1235 if (epoll_ctl(u->meta.manager->epoll_fd,
1236 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1248 void unit_unwatch_fd(Unit *u, Watch *w) {
1252 if (w->type == WATCH_INVALID)
1255 assert(w->type == WATCH_FD);
1256 assert(w->data.unit == u);
1257 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1260 w->type = WATCH_INVALID;
1261 w->data.unit = NULL;
1264 int unit_watch_pid(Unit *u, pid_t pid) {
1268 /* Watch a specific PID. We only support one unit watching
1269 * each PID for now. */
1271 return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1274 void unit_unwatch_pid(Unit *u, pid_t pid) {
1278 hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1281 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1282 struct itimerspec its;
1288 assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1290 /* This will try to reuse the old timer if there is one */
1292 if (w->type == WATCH_UNIT_TIMER) {
1293 assert(w->data.unit == u);
1298 } else if (w->type == WATCH_INVALID) {
1301 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1304 assert_not_reached("Invalid watch type");
1309 /* Set absolute time in the past, but not 0, since we
1310 * don't want to disarm the timer */
1311 its.it_value.tv_sec = 0;
1312 its.it_value.tv_nsec = 1;
1314 flags = TFD_TIMER_ABSTIME;
1316 timespec_store(&its.it_value, delay);
1320 /* This will also flush the elapse counter */
1321 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1324 if (w->type == WATCH_INVALID) {
1325 struct epoll_event ev;
1329 ev.events = EPOLLIN;
1331 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1335 w->type = WATCH_UNIT_TIMER;
1343 close_nointr_nofail(fd);
1348 void unit_unwatch_timer(Unit *u, Watch *w) {
1352 if (w->type == WATCH_INVALID)
1355 assert(w->type == WATCH_UNIT_TIMER);
1356 assert(w->data.unit == u);
1359 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1360 close_nointr_nofail(w->fd);
1363 w->type = WATCH_INVALID;
1364 w->data.unit = NULL;
1367 bool unit_job_is_applicable(Unit *u, JobType j) {
1369 assert(j >= 0 && j < _JOB_TYPE_MAX);
1373 case JOB_VERIFY_ACTIVE:
1379 case JOB_TRY_RESTART:
1380 return unit_can_start(u);
1383 return unit_can_reload(u);
1385 case JOB_RELOAD_OR_START:
1386 return unit_can_reload(u) && unit_can_start(u);
1389 assert_not_reached("Invalid job type");
1393 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1395 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1396 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1397 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1398 [UNIT_WANTS] = UNIT_WANTED_BY,
1399 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1400 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1401 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1402 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1403 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1404 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1405 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1406 [UNIT_BEFORE] = UNIT_AFTER,
1407 [UNIT_AFTER] = UNIT_BEFORE,
1408 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1409 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1410 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1412 int r, q = 0, v = 0, w = 0;
1415 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1418 u = unit_follow_merge(u);
1419 other = unit_follow_merge(other);
1421 /* We won't allow dependencies on ourselves. We will not
1422 * consider them an error however. */
1426 if (UNIT_VTABLE(u)->no_requires &&
1427 (d == UNIT_REQUIRES ||
1428 d == UNIT_REQUIRES_OVERRIDABLE ||
1429 d == UNIT_REQUISITE ||
1430 d == UNIT_REQUISITE_OVERRIDABLE)) {
1434 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1437 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1438 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1442 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1443 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1446 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1449 if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1450 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1455 if (add_reference) {
1456 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1461 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1465 unit_add_to_dbus_queue(u);
1470 set_remove(u->meta.dependencies[d], other);
1473 set_remove(other->meta.dependencies[inverse_table[d]], u);
1476 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1481 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1486 if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1489 if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1495 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1499 assert(name || path);
1502 name = file_name_from_path(path);
1504 if (!unit_name_is_template(name)) {
1509 if (u->meta.instance)
1510 s = unit_name_replace_instance(name, u->meta.instance);
1514 if (!(i = unit_name_to_prefix(u->meta.id)))
1517 s = unit_name_replace_instance(name, i);
1528 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1534 assert(name || path);
1536 if (!(name = resolve_template(u, name, path, &s)))
1539 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1542 r = unit_add_dependency(u, d, other, add_reference);
1549 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1555 assert(name || path);
1557 if (!(name = resolve_template(u, name, path, &s)))
1560 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1563 r = unit_add_two_dependencies(u, d, e, other, add_reference);
1570 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1576 assert(name || path);
1578 if (!(name = resolve_template(u, name, path, &s)))
1581 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1584 r = unit_add_dependency(other, d, u, add_reference);
1591 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1597 assert(name || path);
1599 if (!(name = resolve_template(u, name, path, &s)))
1602 if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1605 if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1613 int set_unit_path(const char *p) {
1617 /* This is mostly for debug purposes */
1619 if (path_is_absolute(p)) {
1620 if (!(c = strdup(p)))
1623 if (!(cwd = get_current_dir_name()))
1626 r = asprintf(&c, "%s/%s", cwd, p);
1633 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1642 char *unit_dbus_path(Unit *u) {
1650 if (!(e = bus_path_escape(u->meta.id)))
1653 p = strappend("/org/freedesktop/systemd1/unit/", e);
1659 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1669 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1672 /* Ensure this hasn't been added yet */
1675 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1676 LIST_PREPEND(CGroupBonding, by_path, l, b);
1678 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1679 LIST_REMOVE(CGroupBonding, by_path, l, b);
1683 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1689 static char *default_cgroup_path(Unit *u) {
1695 if (u->meta.instance) {
1698 if (!(t = unit_name_template(u->meta.id)))
1701 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1704 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1706 return r < 0 ? NULL : p;
1709 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1710 char *controller = NULL, *path = NULL;
1711 CGroupBonding *b = NULL;
1717 if ((r = cg_split_spec(name, &controller, &path)) < 0)
1721 path = default_cgroup_path(u);
1724 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1726 if (!path || !controller) {
1733 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1738 if (!(b = new0(CGroupBonding, 1))) {
1743 b->controller = controller;
1746 b->clean_up = false;
1748 if ((r = unit_add_cgroup(u, b)) < 0)
1761 int unit_add_default_cgroup(Unit *u) {
1767 /* Adds in the default cgroup data, if it wasn't specified yet */
1769 if (unit_get_default_cgroup(u))
1772 if (!(b = new0(CGroupBonding, 1)))
1775 if (!(b->path = default_cgroup_path(u)))
1781 if ((r = unit_add_cgroup(u, b)) < 0)
1788 free(b->controller);
1794 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1797 return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1800 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1808 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1811 assert(!unit_has_name(u, t));
1813 r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1816 assert(r < 0 || *_found != u);
1821 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1829 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1832 assert(!unit_has_name(u, t));
1834 found = manager_get_unit(u->meta.manager, t);
1844 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1848 return unit_name_to_prefix_and_instance(u->meta.id);
1851 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1855 return unit_name_to_prefix(u->meta.id);
1858 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1864 if (!(p = unit_name_to_prefix(u->meta.id)))
1867 r = unit_name_unescape(p);
1873 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1877 if (u->meta.instance)
1878 return unit_name_unescape(u->meta.instance);
1883 static char *specifier_filename(char specifier, void *data, void *userdata) {
1887 if (u->meta.instance)
1888 return unit_name_path_unescape(u->meta.instance);
1890 return unit_name_to_path(u->meta.instance);
1893 char *unit_name_printf(Unit *u, const char* format) {
1896 * This will use the passed string as format string and
1897 * replace the following specifiers:
1899 * %n: the full id of the unit (foo@bar.waldo)
1900 * %N: the id of the unit without the suffix (foo@bar)
1901 * %p: the prefix (foo)
1902 * %i: the instance (bar)
1905 const Specifier table[] = {
1906 { 'n', specifier_string, u->meta.id },
1907 { 'N', specifier_prefix_and_instance, NULL },
1908 { 'p', specifier_prefix, NULL },
1909 { 'i', specifier_string, u->meta.instance },
1916 return specifier_printf(format, table, u);
1919 char *unit_full_printf(Unit *u, const char *format) {
1921 /* This is similar to unit_name_printf() but also supports
1924 const Specifier table[] = {
1925 { 'n', specifier_string, u->meta.id },
1926 { 'N', specifier_prefix_and_instance, NULL },
1927 { 'p', specifier_prefix, NULL },
1928 { 'P', specifier_prefix_unescaped, NULL },
1929 { 'i', specifier_string, u->meta.instance },
1930 { 'I', specifier_instance_unescaped, NULL },
1931 { 'f', specifier_filename, NULL },
1938 return specifier_printf(format, table, u);
1941 char **unit_full_printf_strv(Unit *u, char **l) {
1945 /* Applies unit_full_printf to every entry in l */
1950 if (!(r = new(char*, n+1)))
1953 for (i = l, j = r; *i; i++, j++)
1954 if (!(*j = unit_full_printf(u, *i)))
1970 int unit_watch_bus_name(Unit *u, const char *name) {
1974 /* Watch a specific name on the bus. We only support one unit
1975 * watching each name for now. */
1977 return hashmap_put(u->meta.manager->watch_bus, name, u);
1980 void unit_unwatch_bus_name(Unit *u, const char *name) {
1984 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1987 bool unit_can_serialize(Unit *u) {
1990 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1993 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2000 if (!unit_can_serialize(u))
2003 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2007 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2014 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2025 va_start(ap, format);
2026 vfprintf(f, format, ap);
2032 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2038 fprintf(f, "%s=%s\n", key, value);
2041 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2048 if (!unit_can_serialize(u))
2052 char line[1024], *l, *v;
2055 if (!fgets(line, sizeof(line), f)) {
2068 k = strcspn(l, "=");
2076 if (streq(l, "job")) {
2079 if ((type = job_type_from_string(v)) < 0)
2080 log_debug("Failed to parse job type value %s", v);
2082 u->meta.deserialized_job = type;
2087 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2092 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2102 /* Adds in links to the device node that this unit is based on */
2104 if (!is_device_path(what))
2107 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2110 r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2116 if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, device, true)) < 0)
2120 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2126 int unit_coldplug(Unit *u) {
2131 if (UNIT_VTABLE(u)->coldplug)
2132 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2135 if (u->meta.deserialized_job >= 0) {
2136 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL, NULL)) < 0)
2139 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2145 void unit_status_printf(Unit *u, const char *format, ...) {
2151 if (!UNIT_VTABLE(u)->show_status)
2154 if (u->meta.manager->running_as != MANAGER_SYSTEM)
2157 if (!u->meta.manager->show_status)
2160 if (!manager_is_booting_or_shutting_down(u->meta.manager))
2163 va_start(ap, format);
2164 status_vprintf(format, ap);
2168 bool unit_need_daemon_reload(Unit *u) {
2173 if (!u->meta.fragment_path)
2177 if (stat(u->meta.fragment_path, &st) < 0)
2178 /* What, cannot access this anymore? */
2182 u->meta.fragment_mtime &&
2183 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2186 void unit_reset_failed(Unit *u) {
2189 if (UNIT_VTABLE(u)->reset_failed)
2190 UNIT_VTABLE(u)->reset_failed(u);
2193 Unit *unit_following(Unit *u) {
2196 if (UNIT_VTABLE(u)->following)
2197 return UNIT_VTABLE(u)->following(u);
2202 bool unit_pending_inactive(Unit *u) {
2205 /* Returns true if the unit is inactive or going down */
2207 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2210 if (u->meta.job && u->meta.job->type == JOB_STOP)
2216 bool unit_pending_active(Unit *u) {
2219 /* Returns true if the unit is inactive or going down */
2221 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2225 (u->meta.job->type == JOB_START ||
2226 u->meta.job->type == JOB_RELOAD_OR_START ||
2227 u->meta.job->type == JOB_RESTART))
2233 UnitType unit_name_to_type(const char *n) {
2238 for (t = 0; t < _UNIT_TYPE_MAX; t++)
2239 if (endswith(n, unit_vtable[t]->suffix))
2242 return _UNIT_TYPE_INVALID;
2245 bool unit_name_is_valid(const char *n, bool template_ok) {
2248 t = unit_name_to_type(n);
2249 if (t < 0 || t >= _UNIT_TYPE_MAX)
2252 return unit_name_is_valid_no_type(n, template_ok);
2255 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2257 assert(w >= 0 && w < _KILL_WHO_MAX);
2258 assert(m >= 0 && m < _KILL_MODE_MAX);
2260 assert(signo < _NSIG);
2265 if (!UNIT_VTABLE(u)->kill)
2268 return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2271 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2272 [UNIT_STUB] = "stub",
2273 [UNIT_LOADED] = "loaded",
2274 [UNIT_ERROR] = "error",
2275 [UNIT_MERGED] = "merged",
2276 [UNIT_MASKED] = "masked"
2279 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2281 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2282 [UNIT_ACTIVE] = "active",
2283 [UNIT_RELOADING] = "reloading",
2284 [UNIT_INACTIVE] = "inactive",
2285 [UNIT_FAILED] = "failed",
2286 [UNIT_ACTIVATING] = "activating",
2287 [UNIT_DEACTIVATING] = "deactivating"
2290 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2292 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2293 [UNIT_REQUIRES] = "Requires",
2294 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2295 [UNIT_WANTS] = "Wants",
2296 [UNIT_REQUISITE] = "Requisite",
2297 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2298 [UNIT_REQUIRED_BY] = "RequiredBy",
2299 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2300 [UNIT_WANTED_BY] = "WantedBy",
2301 [UNIT_CONFLICTS] = "Conflicts",
2302 [UNIT_CONFLICTED_BY] = "ConflictedBy",
2303 [UNIT_BEFORE] = "Before",
2304 [UNIT_AFTER] = "After",
2305 [UNIT_REFERENCES] = "References",
2306 [UNIT_REFERENCED_BY] = "ReferencedBy",
2307 [UNIT_ON_FAILURE] = "OnFailure"
2310 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);