1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
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>
35 #include "load-fragment.h"
36 #include "load-dropin.h"
38 #include "unit-name.h"
39 #include "specifier.h"
40 #include "dbus-unit.h"
42 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
43 [UNIT_SERVICE] = &service_vtable,
44 [UNIT_TIMER] = &timer_vtable,
45 [UNIT_SOCKET] = &socket_vtable,
46 [UNIT_TARGET] = &target_vtable,
47 [UNIT_DEVICE] = &device_vtable,
48 [UNIT_MOUNT] = &mount_vtable,
49 [UNIT_AUTOMOUNT] = &automount_vtable,
50 [UNIT_SNAPSHOT] = &snapshot_vtable
53 Unit *unit_new(Manager *m) {
58 if (!(u = new0(Unit, 1)))
61 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
67 u->meta.type = _UNIT_TYPE_INVALID;
72 bool unit_has_name(Unit *u, const char *name) {
76 return !!set_get(u->meta.names, (char*) name);
79 int unit_add_name(Unit *u, const char *text) {
81 char *s = NULL, *i = NULL;
87 if (unit_name_is_template(text)) {
88 if (!u->meta.instance)
91 s = unit_name_replace_instance(text, u->meta.instance);
98 if (!unit_name_is_valid(s)) {
103 assert_se((t = unit_name_to_type(s)) >= 0);
105 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
110 if ((r = unit_name_to_instance(s, &i)) < 0)
113 if (i && unit_vtable[t]->no_instances)
116 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
121 if (unit_vtable[t]->no_alias &&
122 !set_isempty(u->meta.names) &&
123 !set_get(u->meta.names, s)) {
128 if ((r = set_put(u->meta.names, s)) < 0) {
134 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
135 set_remove(u->meta.names, s);
139 if (u->meta.type == _UNIT_TYPE_INVALID) {
143 u->meta.instance = i;
145 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
147 if (UNIT_VTABLE(u)->init)
148 UNIT_VTABLE(u)->init(u);
152 unit_add_to_dbus_queue(u);
162 int unit_choose_id(Unit *u, const char *name) {
168 if (unit_name_is_template(name)) {
170 if (!u->meta.instance)
173 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
179 /* Selects one of the names of this unit as the id */
180 s = set_get(u->meta.names, (char*) name);
187 unit_add_to_dbus_queue(u);
192 int unit_set_description(Unit *u, const char *description) {
197 if (!(s = strdup(description)))
200 free(u->meta.description);
201 u->meta.description = s;
203 unit_add_to_dbus_queue(u);
207 bool unit_check_gc(Unit *u) {
210 if (UNIT_VTABLE(u)->no_gc)
216 if (unit_active_state(u) != UNIT_INACTIVE)
219 if (UNIT_VTABLE(u)->check_gc)
220 if (UNIT_VTABLE(u)->check_gc(u))
226 void unit_add_to_load_queue(Unit *u) {
228 assert(u->meta.type != _UNIT_TYPE_INVALID);
230 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
233 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
234 u->meta.in_load_queue = true;
237 void unit_add_to_cleanup_queue(Unit *u) {
240 if (u->meta.in_cleanup_queue)
243 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
244 u->meta.in_cleanup_queue = true;
247 void unit_add_to_gc_queue(Unit *u) {
250 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
253 if (unit_check_gc(u))
256 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
257 u->meta.in_gc_queue = true;
259 u->meta.manager->n_in_gc_queue ++;
261 if (u->meta.manager->gc_queue_timestamp <= 0)
262 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
265 void unit_add_to_dbus_queue(Unit *u) {
267 assert(u->meta.type != _UNIT_TYPE_INVALID);
269 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
272 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
273 u->meta.in_dbus_queue = true;
276 static void bidi_set_free(Unit *u, Set *s) {
282 /* Frees the set and makes sure we are dropped from the
283 * inverse pointers */
285 SET_FOREACH(other, s, i) {
288 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
289 set_remove(other->meta.dependencies[d], u);
291 unit_add_to_gc_queue(other);
297 void unit_free(Unit *u) {
304 bus_unit_send_removed_signal(u);
306 /* Detach from next 'bigger' objects */
307 SET_FOREACH(t, u->meta.names, i)
308 hashmap_remove_value(u->meta.manager->units, t, u);
310 if (u->meta.type != _UNIT_TYPE_INVALID)
311 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
313 if (u->meta.in_load_queue)
314 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
316 if (u->meta.in_dbus_queue)
317 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
319 if (u->meta.in_cleanup_queue)
320 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
322 if (u->meta.in_gc_queue) {
323 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
324 u->meta.manager->n_in_gc_queue--;
327 /* Free data and next 'smaller' objects */
329 job_free(u->meta.job);
331 if (u->meta.load_state != UNIT_STUB)
332 if (UNIT_VTABLE(u)->done)
333 UNIT_VTABLE(u)->done(u);
335 cgroup_bonding_free_list(u->meta.cgroup_bondings);
337 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
338 bidi_set_free(u, u->meta.dependencies[d]);
340 free(u->meta.description);
341 free(u->meta.fragment_path);
343 while ((t = set_steal_first(u->meta.names)))
345 set_free(u->meta.names);
347 free(u->meta.instance);
352 UnitActiveState unit_active_state(Unit *u) {
355 if (u->meta.load_state != UNIT_LOADED)
356 return UNIT_INACTIVE;
358 return UNIT_VTABLE(u)->active_state(u);
361 const char* unit_sub_state_to_string(Unit *u) {
364 return UNIT_VTABLE(u)->sub_state_to_string(u);
367 static void complete_move(Set **s, Set **other) {
375 set_move(*s, *other);
382 static void merge_names(Unit *u, Unit *other) {
389 complete_move(&u->meta.names, &other->meta.names);
391 while ((t = set_steal_first(other->meta.names)))
394 set_free(other->meta.names);
395 other->meta.names = NULL;
396 other->meta.id = NULL;
398 SET_FOREACH(t, u->meta.names, i)
399 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
402 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
409 assert(d < _UNIT_DEPENDENCY_MAX);
411 SET_FOREACH(back, other->meta.dependencies[d], i) {
414 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
415 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
418 set_remove(back->meta.dependencies[k], other);
420 assert(r == -ENOENT);
424 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
426 set_free(other->meta.dependencies[d]);
427 other->meta.dependencies[d] = NULL;
430 int unit_merge(Unit *u, Unit *other) {
435 assert(u->meta.manager == other->meta.manager);
436 assert(u->meta.type != _UNIT_TYPE_INVALID);
438 other = unit_follow_merge(other);
443 if (u->meta.type != other->meta.type)
446 if (!streq_ptr(u->meta.instance, other->meta.instance))
449 if (other->meta.load_state != UNIT_STUB &&
450 other->meta.load_state != UNIT_FAILED)
456 if (unit_active_state(other) != UNIT_INACTIVE)
460 merge_names(u, other);
462 /* Merge dependencies */
463 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
464 merge_dependencies(u, other, d);
466 other->meta.load_state = UNIT_MERGED;
467 other->meta.merged_into = u;
469 /* If there is still some data attached to the other node, we
470 * don't need it anymore, and can free it. */
471 if (other->meta.load_state != UNIT_STUB)
472 if (UNIT_VTABLE(other)->done)
473 UNIT_VTABLE(other)->done(other);
475 unit_add_to_dbus_queue(u);
476 unit_add_to_cleanup_queue(other);
481 int unit_merge_by_name(Unit *u, const char *name) {
489 if (unit_name_is_template(name)) {
490 if (!u->meta.instance)
493 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
499 if (!(other = manager_get_unit(u->meta.manager, name)))
500 r = unit_add_name(u, name);
502 r = unit_merge(u, other);
508 Unit* unit_follow_merge(Unit *u) {
511 while (u->meta.load_state == UNIT_MERGED)
512 assert_se(u = u->meta.merged_into);
517 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
523 if (c->std_output != EXEC_OUTPUT_KERNEL && c->std_output != EXEC_OUTPUT_SYSLOG)
526 /* If syslog or kernel logging is requested, make sure our own
527 * logging daemon is run first. */
529 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
532 if (u->meta.manager->running_as != MANAGER_SESSION)
533 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
539 const char *unit_description(Unit *u) {
542 if (u->meta.description)
543 return u->meta.description;
548 void unit_dump(Unit *u, FILE *f, const char *prefix) {
555 char timestamp1[FORMAT_TIMESTAMP_MAX], timestamp2[FORMAT_TIMESTAMP_MAX];
558 assert(u->meta.type >= 0);
562 p2 = strappend(prefix, "\t");
563 prefix2 = p2 ? p2 : prefix;
567 "%s\tDescription: %s\n"
569 "%s\tUnit Load State: %s\n"
570 "%s\tUnit Active State: %s\n"
571 "%s\tActive Enter Timestamp: %s\n"
572 "%s\tActive Exit Timestamp: %s\n"
573 "%s\tGC Check Good: %s\n",
575 prefix, unit_description(u),
576 prefix, strna(u->meta.instance),
577 prefix, unit_load_state_to_string(u->meta.load_state),
578 prefix, unit_active_state_to_string(unit_active_state(u)),
579 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.active_enter_timestamp)),
580 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_exit_timestamp)),
581 prefix, yes_no(unit_check_gc(u)));
583 SET_FOREACH(t, u->meta.names, i)
584 fprintf(f, "%s\tName: %s\n", prefix, t);
586 if (u->meta.fragment_path)
587 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
589 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
592 SET_FOREACH(other, u->meta.dependencies[d], i)
593 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
596 if (u->meta.load_state == UNIT_LOADED) {
598 "%s\tRecursive Stop: %s\n"
599 "%s\tStop When Unneeded: %s\n",
600 prefix, yes_no(u->meta.recursive_stop),
601 prefix, yes_no(u->meta.stop_when_unneeded));
603 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
604 fprintf(f, "%s\tControlGroup: %s:%s\n",
605 prefix, b->controller, b->path);
607 if (UNIT_VTABLE(u)->dump)
608 UNIT_VTABLE(u)->dump(u, f, prefix2);
610 } else if (u->meta.load_state == UNIT_MERGED)
612 "%s\tMerged into: %s\n",
613 prefix, u->meta.merged_into->meta.id);
616 job_dump(u->meta.job, f, prefix2);
621 /* Common implementation for multiple backends */
622 int unit_load_fragment_and_dropin(Unit *u) {
627 /* Load a .service file */
628 if ((r = unit_load_fragment(u)) < 0)
631 if (u->meta.load_state == UNIT_STUB)
634 /* Load drop-in directory data */
635 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
641 /* Common implementation for multiple backends */
642 int unit_load_fragment_and_dropin_optional(Unit *u) {
647 /* Same as unit_load_fragment_and_dropin(), but whether
648 * something can be loaded or not doesn't matter. */
650 /* Load a .service file */
651 if ((r = unit_load_fragment(u)) < 0)
654 if (u->meta.load_state == UNIT_STUB)
655 u->meta.load_state = UNIT_LOADED;
657 /* Load drop-in directory data */
658 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
664 /* Common implementation for multiple backends */
665 int unit_load_nop(Unit *u) {
668 if (u->meta.load_state == UNIT_STUB)
669 u->meta.load_state = UNIT_LOADED;
674 int unit_load(Unit *u) {
679 if (u->meta.in_load_queue) {
680 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
681 u->meta.in_load_queue = false;
684 if (u->meta.type == _UNIT_TYPE_INVALID)
687 if (u->meta.load_state != UNIT_STUB)
690 if (UNIT_VTABLE(u)->load)
691 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
694 if (u->meta.load_state == UNIT_STUB) {
699 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
701 unit_add_to_dbus_queue(unit_follow_merge(u));
702 unit_add_to_gc_queue(u);
707 u->meta.load_state = UNIT_FAILED;
708 unit_add_to_dbus_queue(u);
710 log_error("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
716 * -EBADR: This unit type does not support starting.
717 * -EALREADY: Unit is already started.
718 * -EAGAIN: An operation is already in progress. Retry later.
720 int unit_start(Unit *u) {
721 UnitActiveState state;
725 /* If this is already (being) started, then this will
726 * succeed. Note that this will even succeed if this unit is
727 * not startable by the user. This is relied on to detect when
728 * we need to wait for units and when waiting is finished. */
729 state = unit_active_state(u);
730 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
733 /* If it is stopped, but we cannot start it, then fail */
734 if (!UNIT_VTABLE(u)->start)
737 /* We don't suppress calls to ->start() here when we are
738 * already starting, to allow this request to be used as a
739 * "hurry up" call, for example when the unit is in some "auto
740 * restart" state where it waits for a holdoff timer to elapse
741 * before it will start again. */
743 unit_add_to_dbus_queue(u);
744 return UNIT_VTABLE(u)->start(u);
747 bool unit_can_start(Unit *u) {
750 return !!UNIT_VTABLE(u)->start;
754 * -EBADR: This unit type does not support stopping.
755 * -EALREADY: Unit is already stopped.
756 * -EAGAIN: An operation is already in progress. Retry later.
758 int unit_stop(Unit *u) {
759 UnitActiveState state;
763 state = unit_active_state(u);
764 if (state == UNIT_INACTIVE)
767 if (!UNIT_VTABLE(u)->stop)
770 unit_add_to_dbus_queue(u);
771 return UNIT_VTABLE(u)->stop(u);
775 * -EBADR: This unit type does not support reloading.
776 * -ENOEXEC: Unit is not started.
777 * -EAGAIN: An operation is already in progress. Retry later.
779 int unit_reload(Unit *u) {
780 UnitActiveState state;
784 if (!unit_can_reload(u))
787 state = unit_active_state(u);
788 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
791 if (unit_active_state(u) != UNIT_ACTIVE)
794 unit_add_to_dbus_queue(u);
795 return UNIT_VTABLE(u)->reload(u);
798 bool unit_can_reload(Unit *u) {
801 if (!UNIT_VTABLE(u)->reload)
804 if (!UNIT_VTABLE(u)->can_reload)
807 return UNIT_VTABLE(u)->can_reload(u);
810 static void unit_check_uneeded(Unit *u) {
816 /* If this service shall be shut down when unneeded then do
819 if (!u->meta.stop_when_unneeded)
822 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
825 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
826 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
829 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
830 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
833 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
834 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
837 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
839 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
840 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
843 static void retroactively_start_dependencies(Unit *u) {
848 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
850 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
851 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
852 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
854 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
855 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
856 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
858 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
859 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
860 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
862 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
863 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
864 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
866 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
867 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
868 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
871 static void retroactively_stop_dependencies(Unit *u) {
876 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
878 if (u->meta.recursive_stop) {
879 /* Pull down units need us recursively if enabled */
880 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
881 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
882 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
885 /* Garbage collect services that might not be needed anymore, if enabled */
886 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
887 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
888 unit_check_uneeded(other);
889 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
890 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
891 unit_check_uneeded(other);
892 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
893 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
894 unit_check_uneeded(other);
895 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
896 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
897 unit_check_uneeded(other);
898 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
899 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
900 unit_check_uneeded(other);
903 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
904 bool unexpected = false;
907 assert(os < _UNIT_ACTIVE_STATE_MAX);
908 assert(ns < _UNIT_ACTIVE_STATE_MAX);
910 /* Note that this is called for all low-level state changes,
911 * even if they might map to the same high-level
912 * UnitActiveState! That means that ns == os is OK an expected
913 * behaviour here. For example: if a mount point is remounted
914 * this function will be called too and the utmp code below
917 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
918 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
919 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
920 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
924 if (u->meta.job->state == JOB_WAITING)
926 /* So we reached a different state for this
927 * job. Let's see if we can run it now if it
928 * failed previously due to EAGAIN. */
929 job_add_to_run_queue(u->meta.job);
932 assert(u->meta.job->state == JOB_RUNNING);
934 /* Let's check whether this state change
935 * constitutes a finished job, or maybe
936 * cotradicts a running job and hence needs to
937 * invalidate jobs. */
939 switch (u->meta.job->type) {
942 case JOB_VERIFY_ACTIVE:
944 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
945 job_finish_and_invalidate(u->meta.job, true);
946 else if (ns != UNIT_ACTIVATING) {
948 job_finish_and_invalidate(u->meta.job, false);
954 case JOB_RELOAD_OR_START:
956 if (ns == UNIT_ACTIVE)
957 job_finish_and_invalidate(u->meta.job, true);
958 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
960 job_finish_and_invalidate(u->meta.job, false);
967 case JOB_TRY_RESTART:
969 if (ns == UNIT_INACTIVE)
970 job_finish_and_invalidate(u->meta.job, true);
971 else if (ns != UNIT_DEACTIVATING) {
973 job_finish_and_invalidate(u->meta.job, false);
979 assert_not_reached("Job type unknown");
984 /* If this state change happened without being requested by a
985 * job, then let's retroactively start or stop dependencies */
988 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
989 retroactively_start_dependencies(u);
990 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
991 retroactively_stop_dependencies(u);
994 /* Some names are special */
995 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
996 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
997 /* The bus just might have become available,
998 * hence try to connect to it, if we aren't
1000 bus_init_system(u->meta.manager);
1001 bus_init_api(u->meta.manager);
1004 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1005 /* The syslog daemon just might have become
1006 * available, hence try to connect to it, if
1007 * we aren't yet connected. */
1010 if (u->meta.type == UNIT_MOUNT)
1011 /* Another directory became available, let's
1012 * check if that is enough to write our utmp
1014 manager_write_utmp_reboot(u->meta.manager);
1016 if (u->meta.type == UNIT_TARGET)
1017 /* A target got activated, maybe this is a runlevel? */
1018 manager_write_utmp_runlevel(u->meta.manager, u);
1020 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1022 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1023 /* The syslog daemon might just have
1024 * terminated, hence try to disconnect from
1028 /* We don't care about D-Bus here, since we'll get an
1029 * asynchronous notification for it anyway. */
1032 /* Maybe we finished startup and are now ready for being
1033 * stopped because unneeded? */
1034 unit_check_uneeded(u);
1036 unit_add_to_dbus_queue(u);
1037 unit_add_to_gc_queue(u);
1040 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1041 struct epoll_event ev;
1046 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1052 if (epoll_ctl(u->meta.manager->epoll_fd,
1053 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1065 void unit_unwatch_fd(Unit *u, Watch *w) {
1069 if (w->type == WATCH_INVALID)
1072 assert(w->type == WATCH_FD);
1073 assert(w->data.unit == u);
1074 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1077 w->type = WATCH_INVALID;
1078 w->data.unit = NULL;
1081 int unit_watch_pid(Unit *u, pid_t pid) {
1085 /* Watch a specific PID. We only support one unit watching
1086 * each PID for now. */
1088 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1091 void unit_unwatch_pid(Unit *u, pid_t pid) {
1095 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1098 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1099 struct itimerspec its;
1105 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1107 /* This will try to reuse the old timer if there is one */
1109 if (w->type == WATCH_TIMER) {
1114 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1121 /* Set absolute time in the past, but not 0, since we
1122 * don't want to disarm the timer */
1123 its.it_value.tv_sec = 0;
1124 its.it_value.tv_nsec = 1;
1126 flags = TFD_TIMER_ABSTIME;
1128 timespec_store(&its.it_value, delay);
1132 /* This will also flush the elapse counter */
1133 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1136 if (w->type == WATCH_INVALID) {
1137 struct epoll_event ev;
1141 ev.events = EPOLLIN;
1143 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1148 w->type = WATCH_TIMER;
1155 close_nointr_nofail(fd);
1160 void unit_unwatch_timer(Unit *u, Watch *w) {
1164 if (w->type == WATCH_INVALID)
1167 assert(w->type == WATCH_TIMER && w->data.unit == u);
1169 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1170 close_nointr_nofail(w->fd);
1173 w->type = WATCH_INVALID;
1174 w->data.unit = NULL;
1177 bool unit_job_is_applicable(Unit *u, JobType j) {
1179 assert(j >= 0 && j < _JOB_TYPE_MAX);
1183 case JOB_VERIFY_ACTIVE:
1189 case JOB_TRY_RESTART:
1190 return unit_can_start(u);
1193 return unit_can_reload(u);
1195 case JOB_RELOAD_OR_START:
1196 return unit_can_reload(u) && unit_can_start(u);
1199 assert_not_reached("Invalid job type");
1203 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1205 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1206 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1207 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1208 [UNIT_WANTS] = UNIT_WANTED_BY,
1209 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1210 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1211 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1212 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1213 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1214 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1215 [UNIT_BEFORE] = UNIT_AFTER,
1216 [UNIT_AFTER] = UNIT_BEFORE,
1217 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1218 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1220 int r, q = 0, v = 0, w = 0;
1223 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1224 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1227 /* We won't allow dependencies on ourselves. We will not
1228 * consider them an error however. */
1232 if (UNIT_VTABLE(u)->no_requires &&
1233 (d == UNIT_REQUIRES ||
1234 d == UNIT_REQUIRES_OVERRIDABLE ||
1235 d == UNIT_REQUISITE ||
1236 d == UNIT_REQUISITE_OVERRIDABLE)) {
1240 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0 ||
1241 (r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1245 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1246 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1249 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1252 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1257 if (add_reference) {
1258 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1263 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1267 unit_add_to_dbus_queue(u);
1272 set_remove(u->meta.dependencies[d], other);
1275 set_remove(other->meta.dependencies[inverse_table[d]], u);
1278 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1283 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1287 assert(name || path);
1290 name = file_name_from_path(path);
1292 if (!unit_name_is_template(name)) {
1297 if (u->meta.instance)
1298 s = unit_name_replace_instance(name, u->meta.instance);
1302 if (!(i = unit_name_to_prefix(u->meta.id)))
1305 s = unit_name_replace_instance(name, i);
1316 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1322 assert(name || path);
1324 if (!(name = resolve_template(u, name, path, &s)))
1327 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1330 r = unit_add_dependency(u, d, other, add_reference);
1337 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1343 assert(name || path);
1345 if (!(name = resolve_template(u, name, path, &s)))
1348 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1351 r = unit_add_dependency(other, d, u, add_reference);
1358 int set_unit_path(const char *p) {
1362 /* This is mostly for debug purposes */
1364 if (path_is_absolute(p)) {
1365 if (!(c = strdup(p)))
1368 if (!(cwd = get_current_dir_name()))
1371 r = asprintf(&c, "%s/%s", cwd, p);
1378 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1387 char *unit_dbus_path(Unit *u) {
1392 if (!(e = bus_path_escape(u->meta.id)))
1395 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1404 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1412 /* Ensure this hasn't been added yet */
1415 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1416 LIST_PREPEND(CGroupBonding, by_path, l, b);
1418 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1419 LIST_REMOVE(CGroupBonding, by_path, l, b);
1423 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1429 static char *default_cgroup_path(Unit *u) {
1435 if (u->meta.instance) {
1438 if (!(t = unit_name_template(u->meta.id)))
1441 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1444 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1446 return r < 0 ? NULL : p;
1449 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1451 char *controller = NULL, *path = NULL;
1452 CGroupBonding *b = NULL;
1458 /* Detect controller name */
1459 n = strcspn(name, ":");
1462 (name[n] == ':' && name[n+1] == 0)) {
1464 /* Only controller name, no path? */
1466 if (!(path = default_cgroup_path(u)))
1472 /* Controller name, and path. */
1475 if (!path_is_absolute(p))
1478 if (!(path = strdup(p)))
1483 controller = strndup(name, n);
1485 controller = strdup(u->meta.manager->cgroup_controller);
1492 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1497 if (!(b = new0(CGroupBonding, 1))) {
1502 b->controller = controller;
1505 b->clean_up = false;
1507 if ((r = unit_add_cgroup(u, b)) < 0)
1520 int unit_add_default_cgroup(Unit *u) {
1526 /* Adds in the default cgroup data, if it wasn't specified yet */
1528 if (unit_get_default_cgroup(u))
1531 if (!(b = new0(CGroupBonding, 1)))
1534 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1537 if (!(b->path = default_cgroup_path(u)))
1543 if ((r = unit_add_cgroup(u, b)) < 0)
1550 free(b->controller);
1556 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1559 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1562 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1570 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1573 assert(!unit_has_name(u, t));
1575 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1578 assert(r < 0 || *_found != u);
1583 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1591 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1594 assert(!unit_has_name(u, t));
1596 found = manager_get_unit(u->meta.manager, t);
1606 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1610 return unit_name_to_prefix_and_instance(u->meta.id);
1613 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1617 return unit_name_to_prefix(u->meta.id);
1620 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1626 if (!(p = unit_name_to_prefix(u->meta.id)))
1629 r = unit_name_unescape(p);
1635 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1639 if (u->meta.instance)
1640 return unit_name_unescape(u->meta.instance);
1645 char *unit_name_printf(Unit *u, const char* format) {
1648 * This will use the passed string as format string and
1649 * replace the following specifiers:
1651 * %n: the full id of the unit (foo@bar.waldo)
1652 * %N: the id of the unit without the suffix (foo@bar)
1653 * %p: the prefix (foo)
1654 * %i: the instance (bar)
1657 const Specifier table[] = {
1658 { 'n', specifier_string, u->meta.id },
1659 { 'N', specifier_prefix_and_instance, NULL },
1660 { 'p', specifier_prefix, NULL },
1661 { 'i', specifier_string, u->meta.instance },
1668 return specifier_printf(format, table, u);
1671 char *unit_full_printf(Unit *u, const char *format) {
1673 /* This is similar to unit_name_printf() but also supports
1676 const Specifier table[] = {
1677 { 'n', specifier_string, u->meta.id },
1678 { 'N', specifier_prefix_and_instance, NULL },
1679 { 'p', specifier_prefix, NULL },
1680 { 'P', specifier_prefix_unescaped, NULL },
1681 { 'i', specifier_string, u->meta.instance },
1682 { 'I', specifier_instance_unescaped, NULL },
1689 return specifier_printf(format, table, u);
1692 char **unit_full_printf_strv(Unit *u, char **l) {
1696 /* Applies unit_full_printf to every entry in l */
1701 if (!(r = new(char*, n+1)))
1704 for (i = l, j = r; *i; i++, j++)
1705 if (!(*j = unit_full_printf(u, *i)))
1721 int unit_watch_bus_name(Unit *u, const char *name) {
1725 /* Watch a specific name on the bus. We only support one unit
1726 * watching each name for now. */
1728 return hashmap_put(u->meta.manager->watch_bus, name, u);
1731 void unit_unwatch_bus_name(Unit *u, const char *name) {
1735 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1738 bool unit_can_serialize(Unit *u) {
1741 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1744 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1751 if (!unit_can_serialize(u))
1754 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1762 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1773 va_start(ap, format);
1774 vfprintf(f, format, ap);
1780 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1786 fprintf(f, "%s=%s\n", key, value);
1789 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1796 if (!unit_can_serialize(u))
1800 char line[1024], *l, *v;
1803 if (!fgets(line, sizeof(line), f)) {
1815 k = strcspn(l, "=");
1823 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1829 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1830 [UNIT_SERVICE] = "service",
1831 [UNIT_TIMER] = "timer",
1832 [UNIT_SOCKET] = "socket",
1833 [UNIT_TARGET] = "target",
1834 [UNIT_DEVICE] = "device",
1835 [UNIT_MOUNT] = "mount",
1836 [UNIT_AUTOMOUNT] = "automount",
1837 [UNIT_SNAPSHOT] = "snapshot"
1840 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1842 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1843 [UNIT_STUB] = "stub",
1844 [UNIT_LOADED] = "loaded",
1845 [UNIT_FAILED] = "failed",
1846 [UNIT_MERGED] = "merged"
1849 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1851 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1852 [UNIT_ACTIVE] = "active",
1853 [UNIT_INACTIVE] = "inactive",
1854 [UNIT_ACTIVATING] = "activating",
1855 [UNIT_DEACTIVATING] = "deactivating"
1858 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1860 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1861 [UNIT_REQUIRES] = "Requires",
1862 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1863 [UNIT_WANTS] = "Wants",
1864 [UNIT_REQUISITE] = "Requisite",
1865 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1866 [UNIT_REQUIRED_BY] = "RequiredBy",
1867 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1868 [UNIT_WANTED_BY] = "WantedBy",
1869 [UNIT_CONFLICTS] = "Conflicts",
1870 [UNIT_BEFORE] = "Before",
1871 [UNIT_AFTER] = "After",
1872 [UNIT_REFERENCES] = "References",
1873 [UNIT_REFERENCED_BY] = "ReferencedBy"
1876 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1878 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1879 [KILL_CONTROL_GROUP] = "control-group",
1880 [KILL_PROCESS_GROUP] = "process-group",
1881 [KILL_PROCESS] = "process",
1882 [KILL_NONE] = "none"
1885 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);