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"
43 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
44 [UNIT_SERVICE] = &service_vtable,
45 [UNIT_TIMER] = &timer_vtable,
46 [UNIT_SOCKET] = &socket_vtable,
47 [UNIT_TARGET] = &target_vtable,
48 [UNIT_DEVICE] = &device_vtable,
49 [UNIT_MOUNT] = &mount_vtable,
50 [UNIT_AUTOMOUNT] = &automount_vtable,
51 [UNIT_SNAPSHOT] = &snapshot_vtable,
52 [UNIT_SWAP] = &swap_vtable,
53 [UNIT_PATH] = &path_vtable
56 Unit *unit_new(Manager *m) {
61 if (!(u = new0(Unit, 1)))
64 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
70 u->meta.type = _UNIT_TYPE_INVALID;
71 u->meta.deserialized_job = _JOB_TYPE_INVALID;
76 bool unit_has_name(Unit *u, const char *name) {
80 return !!set_get(u->meta.names, (char*) name);
83 int unit_add_name(Unit *u, const char *text) {
85 char *s = NULL, *i = NULL;
91 if (unit_name_is_template(text)) {
92 if (!u->meta.instance)
95 s = unit_name_replace_instance(text, u->meta.instance);
102 if (!unit_name_is_valid(s)) {
107 assert_se((t = unit_name_to_type(s)) >= 0);
109 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
114 if ((r = unit_name_to_instance(s, &i)) < 0)
117 if (i && unit_vtable[t]->no_instances)
120 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
125 if (unit_vtable[t]->no_alias &&
126 !set_isempty(u->meta.names) &&
127 !set_get(u->meta.names, s)) {
132 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
137 if ((r = set_put(u->meta.names, s)) < 0) {
143 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
144 set_remove(u->meta.names, s);
148 if (u->meta.type == _UNIT_TYPE_INVALID) {
152 u->meta.instance = i;
154 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
156 if (UNIT_VTABLE(u)->init)
157 UNIT_VTABLE(u)->init(u);
161 unit_add_to_dbus_queue(u);
171 int unit_choose_id(Unit *u, const char *name) {
177 if (unit_name_is_template(name)) {
179 if (!u->meta.instance)
182 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
188 /* Selects one of the names of this unit as the id */
189 s = set_get(u->meta.names, (char*) name);
196 unit_add_to_dbus_queue(u);
201 int unit_set_description(Unit *u, const char *description) {
206 if (!(s = strdup(description)))
209 free(u->meta.description);
210 u->meta.description = s;
212 unit_add_to_dbus_queue(u);
216 bool unit_check_gc(Unit *u) {
219 if (u->meta.load_state == UNIT_STUB)
222 if (UNIT_VTABLE(u)->no_gc)
228 if (unit_active_state(u) != UNIT_INACTIVE)
231 if (UNIT_VTABLE(u)->check_gc)
232 if (UNIT_VTABLE(u)->check_gc(u))
238 void unit_add_to_load_queue(Unit *u) {
240 assert(u->meta.type != _UNIT_TYPE_INVALID);
242 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
245 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
246 u->meta.in_load_queue = true;
249 void unit_add_to_cleanup_queue(Unit *u) {
252 if (u->meta.in_cleanup_queue)
255 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
256 u->meta.in_cleanup_queue = true;
259 void unit_add_to_gc_queue(Unit *u) {
262 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
265 if (unit_check_gc(u))
268 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
269 u->meta.in_gc_queue = true;
271 u->meta.manager->n_in_gc_queue ++;
273 if (u->meta.manager->gc_queue_timestamp <= 0)
274 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
277 void unit_add_to_dbus_queue(Unit *u) {
279 assert(u->meta.type != _UNIT_TYPE_INVALID);
281 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
284 if (set_isempty(u->meta.manager->subscribed)) {
285 u->meta.sent_dbus_new_signal = true;
289 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
290 u->meta.in_dbus_queue = true;
293 static void bidi_set_free(Unit *u, Set *s) {
299 /* Frees the set and makes sure we are dropped from the
300 * inverse pointers */
302 SET_FOREACH(other, s, i) {
305 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
306 set_remove(other->meta.dependencies[d], u);
308 unit_add_to_gc_queue(other);
314 void unit_free(Unit *u) {
321 bus_unit_send_removed_signal(u);
323 if (u->meta.load_state != UNIT_STUB)
324 if (UNIT_VTABLE(u)->done)
325 UNIT_VTABLE(u)->done(u);
327 SET_FOREACH(t, u->meta.names, i)
328 hashmap_remove_value(u->meta.manager->units, t, u);
331 job_free(u->meta.job);
333 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
334 bidi_set_free(u, u->meta.dependencies[d]);
336 if (u->meta.type != _UNIT_TYPE_INVALID)
337 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
339 if (u->meta.in_load_queue)
340 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
342 if (u->meta.in_dbus_queue)
343 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
345 if (u->meta.in_cleanup_queue)
346 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
348 if (u->meta.in_gc_queue) {
349 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
350 u->meta.manager->n_in_gc_queue--;
353 cgroup_bonding_free_list(u->meta.cgroup_bondings);
355 free(u->meta.description);
356 free(u->meta.fragment_path);
358 set_free_free(u->meta.names);
360 free(u->meta.instance);
365 UnitActiveState unit_active_state(Unit *u) {
368 if (u->meta.load_state != UNIT_LOADED)
369 return UNIT_INACTIVE;
371 return UNIT_VTABLE(u)->active_state(u);
374 const char* unit_sub_state_to_string(Unit *u) {
377 return UNIT_VTABLE(u)->sub_state_to_string(u);
380 static void complete_move(Set **s, Set **other) {
388 set_move(*s, *other);
395 static void merge_names(Unit *u, Unit *other) {
402 complete_move(&u->meta.names, &other->meta.names);
404 set_free_free(other->meta.names);
405 other->meta.names = NULL;
406 other->meta.id = NULL;
408 SET_FOREACH(t, u->meta.names, i)
409 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
412 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
419 assert(d < _UNIT_DEPENDENCY_MAX);
421 SET_FOREACH(back, other->meta.dependencies[d], i) {
424 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
425 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
428 set_remove(back->meta.dependencies[k], other);
430 assert(r == -ENOENT);
434 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
436 set_free(other->meta.dependencies[d]);
437 other->meta.dependencies[d] = NULL;
440 int unit_merge(Unit *u, Unit *other) {
445 assert(u->meta.manager == other->meta.manager);
446 assert(u->meta.type != _UNIT_TYPE_INVALID);
448 other = unit_follow_merge(other);
453 if (u->meta.type != other->meta.type)
456 if (!streq_ptr(u->meta.instance, other->meta.instance))
459 if (other->meta.load_state != UNIT_STUB &&
460 other->meta.load_state != UNIT_FAILED)
466 if (unit_active_state(other) != UNIT_INACTIVE)
470 merge_names(u, other);
472 /* Merge dependencies */
473 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
474 merge_dependencies(u, other, d);
476 other->meta.load_state = UNIT_MERGED;
477 other->meta.merged_into = u;
479 /* If there is still some data attached to the other node, we
480 * don't need it anymore, and can free it. */
481 if (other->meta.load_state != UNIT_STUB)
482 if (UNIT_VTABLE(other)->done)
483 UNIT_VTABLE(other)->done(other);
485 unit_add_to_dbus_queue(u);
486 unit_add_to_cleanup_queue(other);
491 int unit_merge_by_name(Unit *u, const char *name) {
499 if (unit_name_is_template(name)) {
500 if (!u->meta.instance)
503 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
509 if (!(other = manager_get_unit(u->meta.manager, name)))
510 r = unit_add_name(u, name);
512 r = unit_merge(u, other);
518 Unit* unit_follow_merge(Unit *u) {
521 while (u->meta.load_state == UNIT_MERGED)
522 assert_se(u = u->meta.merged_into);
527 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
533 if (c->std_output != EXEC_OUTPUT_KMSG &&
534 c->std_output != EXEC_OUTPUT_SYSLOG &&
535 c->std_error != EXEC_OUTPUT_KMSG &&
536 c->std_error != EXEC_OUTPUT_SYSLOG)
539 /* If syslog or kernel logging is requested, make sure our own
540 * logging daemon is run first. */
542 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
545 if (u->meta.manager->running_as == MANAGER_SYSTEM)
546 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
552 const char *unit_description(Unit *u) {
555 if (u->meta.description)
556 return u->meta.description;
561 void unit_dump(Unit *u, FILE *f, const char *prefix) {
569 timestamp1[FORMAT_TIMESTAMP_MAX],
570 timestamp2[FORMAT_TIMESTAMP_MAX],
571 timestamp3[FORMAT_TIMESTAMP_MAX],
572 timestamp4[FORMAT_TIMESTAMP_MAX];
575 assert(u->meta.type >= 0);
579 p2 = strappend(prefix, "\t");
580 prefix2 = p2 ? p2 : prefix;
584 "%s\tDescription: %s\n"
586 "%s\tUnit Load State: %s\n"
587 "%s\tUnit Active State: %s\n"
588 "%s\tInactive Exit Timestamp: %s\n"
589 "%s\tActive Enter Timestamp: %s\n"
590 "%s\tActive Exit Timestamp: %s\n"
591 "%s\tInactive Enter Timestamp: %s\n"
592 "%s\tGC Check Good: %s\n"
593 "%s\tOnly By Dependency: %s\n",
595 prefix, unit_description(u),
596 prefix, strna(u->meta.instance),
597 prefix, unit_load_state_to_string(u->meta.load_state),
598 prefix, unit_active_state_to_string(unit_active_state(u)),
599 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
600 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
601 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
602 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
603 prefix, yes_no(unit_check_gc(u)),
604 prefix, yes_no(u->meta.only_by_dependency));
606 SET_FOREACH(t, u->meta.names, i)
607 fprintf(f, "%s\tName: %s\n", prefix, t);
609 if (u->meta.fragment_path)
610 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
612 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
615 SET_FOREACH(other, u->meta.dependencies[d], i)
616 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
619 if (u->meta.load_state == UNIT_LOADED) {
621 "%s\tRecursive Stop: %s\n"
622 "%s\tStop When Unneeded: %s\n",
623 prefix, yes_no(u->meta.recursive_stop),
624 prefix, yes_no(u->meta.stop_when_unneeded));
626 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
627 fprintf(f, "%s\tControlGroup: %s:%s\n",
628 prefix, b->controller, b->path);
630 if (UNIT_VTABLE(u)->dump)
631 UNIT_VTABLE(u)->dump(u, f, prefix2);
633 } else if (u->meta.load_state == UNIT_MERGED)
635 "%s\tMerged into: %s\n",
636 prefix, u->meta.merged_into->meta.id);
639 job_dump(u->meta.job, f, prefix2);
644 /* Common implementation for multiple backends */
645 int unit_load_fragment_and_dropin(Unit *u) {
650 /* Load a .service file */
651 if ((r = unit_load_fragment(u)) < 0)
654 if (u->meta.load_state == UNIT_STUB)
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_fragment_and_dropin_optional(Unit *u) {
670 /* Same as unit_load_fragment_and_dropin(), but whether
671 * something can be loaded or not doesn't matter. */
673 /* Load a .service file */
674 if ((r = unit_load_fragment(u)) < 0)
677 if (u->meta.load_state == UNIT_STUB)
678 u->meta.load_state = UNIT_LOADED;
680 /* Load drop-in directory data */
681 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
687 /* Common implementation for multiple backends */
688 int unit_load_nop(Unit *u) {
691 if (u->meta.load_state == UNIT_STUB)
692 u->meta.load_state = UNIT_LOADED;
697 int unit_load(Unit *u) {
702 if (u->meta.in_load_queue) {
703 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
704 u->meta.in_load_queue = false;
707 if (u->meta.type == _UNIT_TYPE_INVALID)
710 if (u->meta.load_state != UNIT_STUB)
713 if (UNIT_VTABLE(u)->load)
714 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
717 if (u->meta.load_state == UNIT_STUB) {
722 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
724 unit_add_to_dbus_queue(unit_follow_merge(u));
725 unit_add_to_gc_queue(u);
730 u->meta.load_state = UNIT_FAILED;
731 unit_add_to_dbus_queue(u);
733 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
739 * -EBADR: This unit type does not support starting.
740 * -EALREADY: Unit is already started.
741 * -EAGAIN: An operation is already in progress. Retry later.
742 * -ECANCELED: Too many requests for now.
744 int unit_start(Unit *u) {
745 UnitActiveState state;
749 /* If this is already (being) started, then this will
750 * succeed. Note that this will even succeed if this unit is
751 * not startable by the user. This is relied on to detect when
752 * we need to wait for units and when waiting is finished. */
753 state = unit_active_state(u);
754 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
757 /* If it is stopped, but we cannot start it, then fail */
758 if (!UNIT_VTABLE(u)->start)
761 /* We don't suppress calls to ->start() here when we are
762 * already starting, to allow this request to be used as a
763 * "hurry up" call, for example when the unit is in some "auto
764 * restart" state where it waits for a holdoff timer to elapse
765 * before it will start again. */
767 unit_add_to_dbus_queue(u);
768 return UNIT_VTABLE(u)->start(u);
771 bool unit_can_start(Unit *u) {
774 return !!UNIT_VTABLE(u)->start;
778 * -EBADR: This unit type does not support stopping.
779 * -EALREADY: Unit is already stopped.
780 * -EAGAIN: An operation is already in progress. Retry later.
782 int unit_stop(Unit *u) {
783 UnitActiveState state;
787 state = unit_active_state(u);
788 if (state == UNIT_INACTIVE)
791 if (!UNIT_VTABLE(u)->stop)
794 unit_add_to_dbus_queue(u);
795 return UNIT_VTABLE(u)->stop(u);
799 * -EBADR: This unit type does not support reloading.
800 * -ENOEXEC: Unit is not started.
801 * -EAGAIN: An operation is already in progress. Retry later.
803 int unit_reload(Unit *u) {
804 UnitActiveState state;
808 if (!unit_can_reload(u))
811 state = unit_active_state(u);
812 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
815 if (unit_active_state(u) != UNIT_ACTIVE)
818 unit_add_to_dbus_queue(u);
819 return UNIT_VTABLE(u)->reload(u);
822 bool unit_can_reload(Unit *u) {
825 if (!UNIT_VTABLE(u)->reload)
828 if (!UNIT_VTABLE(u)->can_reload)
831 return UNIT_VTABLE(u)->can_reload(u);
834 static void unit_check_uneeded(Unit *u) {
840 /* If this service shall be shut down when unneeded then do
843 if (!u->meta.stop_when_unneeded)
846 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
849 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
850 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
853 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
854 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
857 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
858 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
861 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
863 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
864 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
867 static void retroactively_start_dependencies(Unit *u) {
872 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
874 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
875 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
876 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
878 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
879 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
880 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
882 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
883 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
884 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
886 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
887 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
888 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
890 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
891 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
892 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
895 static void retroactively_stop_dependencies(Unit *u) {
900 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
902 if (u->meta.recursive_stop) {
903 /* Pull down units need us recursively if enabled */
904 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
905 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
906 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
909 /* Garbage collect services that might not be needed anymore, if enabled */
910 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
911 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
912 unit_check_uneeded(other);
913 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
914 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
915 unit_check_uneeded(other);
916 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
917 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
918 unit_check_uneeded(other);
919 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
920 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
921 unit_check_uneeded(other);
922 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
923 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
924 unit_check_uneeded(other);
927 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
928 bool unexpected = false;
932 assert(os < _UNIT_ACTIVE_STATE_MAX);
933 assert(ns < _UNIT_ACTIVE_STATE_MAX);
935 /* Note that this is called for all low-level state changes,
936 * even if they might map to the same high-level
937 * UnitActiveState! That means that ns == os is OK an expected
938 * behaviour here. For example: if a mount point is remounted
939 * this function will be called too and the utmp code below
944 if (os == UNIT_INACTIVE && ns != UNIT_INACTIVE)
945 u->meta.inactive_exit_timestamp = ts;
946 else if (os != UNIT_INACTIVE && ns == UNIT_INACTIVE)
947 u->meta.inactive_enter_timestamp = ts;
949 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
950 u->meta.active_enter_timestamp = ts;
951 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
952 u->meta.active_exit_timestamp = ts;
954 timer_unit_notify(u, ns);
955 path_unit_notify(u, ns);
959 if (u->meta.job->state == JOB_WAITING)
961 /* So we reached a different state for this
962 * job. Let's see if we can run it now if it
963 * failed previously due to EAGAIN. */
964 job_add_to_run_queue(u->meta.job);
967 /* Let's check whether this state change constitutes a
968 * finished job, or maybe cotradicts a running job and
969 * hence needs to invalidate jobs. */
971 switch (u->meta.job->type) {
974 case JOB_VERIFY_ACTIVE:
976 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
977 job_finish_and_invalidate(u->meta.job, true);
978 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
980 job_finish_and_invalidate(u->meta.job, false);
986 case JOB_RELOAD_OR_START:
988 if (u->meta.job->state == JOB_RUNNING) {
989 if (ns == UNIT_ACTIVE)
990 job_finish_and_invalidate(u->meta.job, true);
991 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
993 job_finish_and_invalidate(u->meta.job, false);
1001 case JOB_TRY_RESTART:
1003 if (ns == UNIT_INACTIVE)
1004 job_finish_and_invalidate(u->meta.job, true);
1005 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1007 job_finish_and_invalidate(u->meta.job, false);
1013 assert_not_reached("Job type unknown");
1017 /* If this state change happened without being requested by a
1018 * job, then let's retroactively start or stop dependencies */
1021 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1022 retroactively_start_dependencies(u);
1023 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1024 retroactively_stop_dependencies(u);
1027 /* Some names are special */
1028 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1029 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
1030 /* The bus just might have become available,
1031 * hence try to connect to it, if we aren't
1033 bus_init(u->meta.manager);
1036 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1037 /* The syslog daemon just might have become
1038 * available, hence try to connect to it, if
1039 * we aren't yet connected. */
1042 if (u->meta.type == UNIT_MOUNT)
1043 /* Another directory became available, let's
1044 * check if that is enough to write our utmp
1046 manager_write_utmp_reboot(u->meta.manager);
1048 if (u->meta.type == UNIT_TARGET)
1049 /* A target got activated, maybe this is a runlevel? */
1050 manager_write_utmp_runlevel(u->meta.manager, u);
1052 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1054 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1055 /* The syslog daemon might just have
1056 * terminated, hence try to disconnect from
1060 /* We don't care about D-Bus here, since we'll get an
1061 * asynchronous notification for it anyway. */
1064 /* Maybe we finished startup and are now ready for being
1065 * stopped because unneeded? */
1066 unit_check_uneeded(u);
1068 unit_add_to_dbus_queue(u);
1069 unit_add_to_gc_queue(u);
1072 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1073 struct epoll_event ev;
1078 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1084 if (epoll_ctl(u->meta.manager->epoll_fd,
1085 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1097 void unit_unwatch_fd(Unit *u, Watch *w) {
1101 if (w->type == WATCH_INVALID)
1104 assert(w->type == WATCH_FD);
1105 assert(w->data.unit == u);
1106 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1109 w->type = WATCH_INVALID;
1110 w->data.unit = NULL;
1113 int unit_watch_pid(Unit *u, pid_t pid) {
1117 /* Watch a specific PID. We only support one unit watching
1118 * each PID for now. */
1120 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1123 void unit_unwatch_pid(Unit *u, pid_t pid) {
1127 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1130 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1131 struct itimerspec its;
1137 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1139 /* This will try to reuse the old timer if there is one */
1141 if (w->type == WATCH_TIMER) {
1146 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1153 /* Set absolute time in the past, but not 0, since we
1154 * don't want to disarm the timer */
1155 its.it_value.tv_sec = 0;
1156 its.it_value.tv_nsec = 1;
1158 flags = TFD_TIMER_ABSTIME;
1160 timespec_store(&its.it_value, delay);
1164 /* This will also flush the elapse counter */
1165 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1168 if (w->type == WATCH_INVALID) {
1169 struct epoll_event ev;
1173 ev.events = EPOLLIN;
1175 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1180 w->type = WATCH_TIMER;
1187 close_nointr_nofail(fd);
1192 void unit_unwatch_timer(Unit *u, Watch *w) {
1196 if (w->type == WATCH_INVALID)
1199 assert(w->type == WATCH_TIMER && w->data.unit == u);
1201 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1202 close_nointr_nofail(w->fd);
1205 w->type = WATCH_INVALID;
1206 w->data.unit = NULL;
1209 bool unit_job_is_applicable(Unit *u, JobType j) {
1211 assert(j >= 0 && j < _JOB_TYPE_MAX);
1215 case JOB_VERIFY_ACTIVE:
1221 case JOB_TRY_RESTART:
1222 return unit_can_start(u);
1225 return unit_can_reload(u);
1227 case JOB_RELOAD_OR_START:
1228 return unit_can_reload(u) && unit_can_start(u);
1231 assert_not_reached("Invalid job type");
1235 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1237 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1238 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1239 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1240 [UNIT_WANTS] = UNIT_WANTED_BY,
1241 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1242 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1243 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1244 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1245 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1246 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1247 [UNIT_BEFORE] = UNIT_AFTER,
1248 [UNIT_AFTER] = UNIT_BEFORE,
1249 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1250 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1252 int r, q = 0, v = 0, w = 0;
1255 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1256 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1259 /* We won't allow dependencies on ourselves. We will not
1260 * consider them an error however. */
1264 if (UNIT_VTABLE(u)->no_requires &&
1265 (d == UNIT_REQUIRES ||
1266 d == UNIT_REQUIRES_OVERRIDABLE ||
1267 d == UNIT_REQUISITE ||
1268 d == UNIT_REQUISITE_OVERRIDABLE)) {
1272 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0 ||
1273 (r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1277 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1278 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1281 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1284 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1289 if (add_reference) {
1290 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1295 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1299 unit_add_to_dbus_queue(u);
1304 set_remove(u->meta.dependencies[d], other);
1307 set_remove(other->meta.dependencies[inverse_table[d]], u);
1310 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1315 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1319 assert(name || path);
1322 name = file_name_from_path(path);
1324 if (!unit_name_is_template(name)) {
1329 if (u->meta.instance)
1330 s = unit_name_replace_instance(name, u->meta.instance);
1334 if (!(i = unit_name_to_prefix(u->meta.id)))
1337 s = unit_name_replace_instance(name, i);
1348 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1354 assert(name || path);
1356 if (!(name = resolve_template(u, name, path, &s)))
1359 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1362 r = unit_add_dependency(u, d, other, add_reference);
1369 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1375 assert(name || path);
1377 if (!(name = resolve_template(u, name, path, &s)))
1380 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1383 r = unit_add_dependency(other, d, u, add_reference);
1390 int set_unit_path(const char *p) {
1394 /* This is mostly for debug purposes */
1396 if (path_is_absolute(p)) {
1397 if (!(c = strdup(p)))
1400 if (!(cwd = get_current_dir_name()))
1403 r = asprintf(&c, "%s/%s", cwd, p);
1410 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1419 char *unit_dbus_path(Unit *u) {
1424 if (!(e = bus_path_escape(u->meta.id)))
1427 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1436 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1444 /* Ensure this hasn't been added yet */
1447 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1448 LIST_PREPEND(CGroupBonding, by_path, l, b);
1450 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1451 LIST_REMOVE(CGroupBonding, by_path, l, b);
1455 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1461 static char *default_cgroup_path(Unit *u) {
1467 if (u->meta.instance) {
1470 if (!(t = unit_name_template(u->meta.id)))
1473 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1476 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1478 return r < 0 ? NULL : p;
1481 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1483 char *controller = NULL, *path = NULL;
1484 CGroupBonding *b = NULL;
1490 /* Detect controller name */
1491 n = strcspn(name, ":");
1494 (name[n] == ':' && name[n+1] == 0)) {
1496 /* Only controller name, no path? */
1498 if (!(path = default_cgroup_path(u)))
1504 /* Controller name, and path. */
1507 if (!path_is_absolute(p))
1510 if (!(path = strdup(p)))
1515 controller = strndup(name, n);
1517 controller = strdup(u->meta.manager->cgroup_controller);
1524 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1529 if (!(b = new0(CGroupBonding, 1))) {
1534 b->controller = controller;
1537 b->clean_up = false;
1539 if ((r = unit_add_cgroup(u, b)) < 0)
1552 int unit_add_default_cgroup(Unit *u) {
1558 /* Adds in the default cgroup data, if it wasn't specified yet */
1560 if (unit_get_default_cgroup(u))
1563 if (!(b = new0(CGroupBonding, 1)))
1566 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1569 if (!(b->path = default_cgroup_path(u)))
1575 if ((r = unit_add_cgroup(u, b)) < 0)
1582 free(b->controller);
1588 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1591 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1594 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1602 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1605 assert(!unit_has_name(u, t));
1607 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1610 assert(r < 0 || *_found != u);
1615 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1623 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1626 assert(!unit_has_name(u, t));
1628 found = manager_get_unit(u->meta.manager, t);
1638 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1642 return unit_name_to_prefix_and_instance(u->meta.id);
1645 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1649 return unit_name_to_prefix(u->meta.id);
1652 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1658 if (!(p = unit_name_to_prefix(u->meta.id)))
1661 r = unit_name_unescape(p);
1667 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1671 if (u->meta.instance)
1672 return unit_name_unescape(u->meta.instance);
1677 char *unit_name_printf(Unit *u, const char* format) {
1680 * This will use the passed string as format string and
1681 * replace the following specifiers:
1683 * %n: the full id of the unit (foo@bar.waldo)
1684 * %N: the id of the unit without the suffix (foo@bar)
1685 * %p: the prefix (foo)
1686 * %i: the instance (bar)
1689 const Specifier table[] = {
1690 { 'n', specifier_string, u->meta.id },
1691 { 'N', specifier_prefix_and_instance, NULL },
1692 { 'p', specifier_prefix, NULL },
1693 { 'i', specifier_string, u->meta.instance },
1700 return specifier_printf(format, table, u);
1703 char *unit_full_printf(Unit *u, const char *format) {
1705 /* This is similar to unit_name_printf() but also supports
1708 const Specifier table[] = {
1709 { 'n', specifier_string, u->meta.id },
1710 { 'N', specifier_prefix_and_instance, NULL },
1711 { 'p', specifier_prefix, NULL },
1712 { 'P', specifier_prefix_unescaped, NULL },
1713 { 'i', specifier_string, u->meta.instance },
1714 { 'I', specifier_instance_unescaped, NULL },
1721 return specifier_printf(format, table, u);
1724 char **unit_full_printf_strv(Unit *u, char **l) {
1728 /* Applies unit_full_printf to every entry in l */
1733 if (!(r = new(char*, n+1)))
1736 for (i = l, j = r; *i; i++, j++)
1737 if (!(*j = unit_full_printf(u, *i)))
1753 int unit_watch_bus_name(Unit *u, const char *name) {
1757 /* Watch a specific name on the bus. We only support one unit
1758 * watching each name for now. */
1760 return hashmap_put(u->meta.manager->watch_bus, name, u);
1763 void unit_unwatch_bus_name(Unit *u, const char *name) {
1767 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1770 bool unit_can_serialize(Unit *u) {
1773 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1776 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1783 if (!unit_can_serialize(u))
1786 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1790 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1797 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1808 va_start(ap, format);
1809 vfprintf(f, format, ap);
1815 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1821 fprintf(f, "%s=%s\n", key, value);
1824 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1831 if (!unit_can_serialize(u))
1835 char line[1024], *l, *v;
1838 if (!fgets(line, sizeof(line), f)) {
1850 k = strcspn(l, "=");
1858 if (streq(l, "job")) {
1861 if ((type = job_type_from_string(v)) < 0)
1862 log_debug("Failed to parse job type value %s", v);
1864 u->meta.deserialized_job = type;
1869 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1874 int unit_add_node_link(Unit *u, const char *what, bool wants) {
1884 /* Adds in links to the device node that this unit is based on */
1886 if (!is_device_path(what))
1889 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
1892 r = manager_load_unit(u->meta.manager, e, NULL, &device);
1898 if ((r = unit_add_dependency(u, UNIT_AFTER, device, true)) < 0)
1901 if ((r = unit_add_dependency(u, UNIT_REQUIRES, device, true)) < 0)
1905 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
1911 int unit_coldplug(Unit *u) {
1916 if (UNIT_VTABLE(u)->coldplug)
1917 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
1920 if (u->meta.deserialized_job >= 0) {
1921 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL)) < 0)
1924 u->meta.deserialized_job = _JOB_TYPE_INVALID;
1930 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1931 [UNIT_SERVICE] = "service",
1932 [UNIT_TIMER] = "timer",
1933 [UNIT_SOCKET] = "socket",
1934 [UNIT_TARGET] = "target",
1935 [UNIT_DEVICE] = "device",
1936 [UNIT_MOUNT] = "mount",
1937 [UNIT_AUTOMOUNT] = "automount",
1938 [UNIT_SNAPSHOT] = "snapshot",
1939 [UNIT_SWAP] = "swap"
1942 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1944 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1945 [UNIT_STUB] = "stub",
1946 [UNIT_LOADED] = "loaded",
1947 [UNIT_FAILED] = "failed",
1948 [UNIT_MERGED] = "merged"
1951 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1953 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1954 [UNIT_ACTIVE] = "active",
1955 [UNIT_INACTIVE] = "inactive",
1956 [UNIT_ACTIVATING] = "activating",
1957 [UNIT_DEACTIVATING] = "deactivating"
1960 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1962 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1963 [UNIT_REQUIRES] = "Requires",
1964 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1965 [UNIT_WANTS] = "Wants",
1966 [UNIT_REQUISITE] = "Requisite",
1967 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1968 [UNIT_REQUIRED_BY] = "RequiredBy",
1969 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1970 [UNIT_WANTED_BY] = "WantedBy",
1971 [UNIT_CONFLICTS] = "Conflicts",
1972 [UNIT_BEFORE] = "Before",
1973 [UNIT_AFTER] = "After",
1974 [UNIT_REFERENCES] = "References",
1975 [UNIT_REFERENCED_BY] = "ReferencedBy"
1978 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1980 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1981 [KILL_CONTROL_GROUP] = "control-group",
1982 [KILL_PROCESS_GROUP] = "process-group",
1983 [KILL_PROCESS] = "process",
1984 [KILL_NONE] = "none"
1987 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);