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,
51 [UNIT_SWAP] = &swap_vtable
54 Unit *unit_new(Manager *m) {
59 if (!(u = new0(Unit, 1)))
62 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
68 u->meta.type = _UNIT_TYPE_INVALID;
73 bool unit_has_name(Unit *u, const char *name) {
77 return !!set_get(u->meta.names, (char*) name);
80 int unit_add_name(Unit *u, const char *text) {
82 char *s = NULL, *i = NULL;
88 if (unit_name_is_template(text)) {
89 if (!u->meta.instance)
92 s = unit_name_replace_instance(text, u->meta.instance);
99 if (!unit_name_is_valid(s)) {
104 assert_se((t = unit_name_to_type(s)) >= 0);
106 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
111 if ((r = unit_name_to_instance(s, &i)) < 0)
114 if (i && unit_vtable[t]->no_instances)
117 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
122 if (unit_vtable[t]->no_alias &&
123 !set_isempty(u->meta.names) &&
124 !set_get(u->meta.names, s)) {
129 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
134 if ((r = set_put(u->meta.names, s)) < 0) {
140 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
141 set_remove(u->meta.names, s);
145 if (u->meta.type == _UNIT_TYPE_INVALID) {
149 u->meta.instance = i;
151 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
153 if (UNIT_VTABLE(u)->init)
154 UNIT_VTABLE(u)->init(u);
158 unit_add_to_dbus_queue(u);
168 int unit_choose_id(Unit *u, const char *name) {
174 if (unit_name_is_template(name)) {
176 if (!u->meta.instance)
179 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
185 /* Selects one of the names of this unit as the id */
186 s = set_get(u->meta.names, (char*) name);
193 unit_add_to_dbus_queue(u);
198 int unit_set_description(Unit *u, const char *description) {
203 if (!(s = strdup(description)))
206 free(u->meta.description);
207 u->meta.description = s;
209 unit_add_to_dbus_queue(u);
213 bool unit_check_gc(Unit *u) {
216 if (UNIT_VTABLE(u)->no_gc)
222 if (unit_active_state(u) != UNIT_INACTIVE)
225 if (UNIT_VTABLE(u)->check_gc)
226 if (UNIT_VTABLE(u)->check_gc(u))
232 void unit_add_to_load_queue(Unit *u) {
234 assert(u->meta.type != _UNIT_TYPE_INVALID);
236 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
239 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
240 u->meta.in_load_queue = true;
243 void unit_add_to_cleanup_queue(Unit *u) {
246 if (u->meta.in_cleanup_queue)
249 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
250 u->meta.in_cleanup_queue = true;
253 void unit_add_to_gc_queue(Unit *u) {
256 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
259 if (unit_check_gc(u))
262 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
263 u->meta.in_gc_queue = true;
265 u->meta.manager->n_in_gc_queue ++;
267 if (u->meta.manager->gc_queue_timestamp <= 0)
268 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
271 void unit_add_to_dbus_queue(Unit *u) {
273 assert(u->meta.type != _UNIT_TYPE_INVALID);
275 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
278 if (set_isempty(u->meta.manager->subscribed)) {
279 u->meta.sent_dbus_new_signal = true;
283 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
284 u->meta.in_dbus_queue = true;
287 static void bidi_set_free(Unit *u, Set *s) {
293 /* Frees the set and makes sure we are dropped from the
294 * inverse pointers */
296 SET_FOREACH(other, s, i) {
299 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
300 set_remove(other->meta.dependencies[d], u);
302 unit_add_to_gc_queue(other);
308 void unit_free(Unit *u) {
315 bus_unit_send_removed_signal(u);
317 /* Detach from next 'bigger' objects */
318 SET_FOREACH(t, u->meta.names, i)
319 hashmap_remove_value(u->meta.manager->units, t, u);
321 if (u->meta.type != _UNIT_TYPE_INVALID)
322 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
324 if (u->meta.in_load_queue)
325 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
327 if (u->meta.in_dbus_queue)
328 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
330 if (u->meta.in_cleanup_queue)
331 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
333 if (u->meta.in_gc_queue) {
334 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
335 u->meta.manager->n_in_gc_queue--;
338 /* Free data and next 'smaller' objects */
340 job_free(u->meta.job);
342 if (u->meta.load_state != UNIT_STUB)
343 if (UNIT_VTABLE(u)->done)
344 UNIT_VTABLE(u)->done(u);
346 cgroup_bonding_free_list(u->meta.cgroup_bondings);
348 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
349 bidi_set_free(u, u->meta.dependencies[d]);
351 free(u->meta.description);
352 free(u->meta.fragment_path);
354 while ((t = set_steal_first(u->meta.names)))
356 set_free(u->meta.names);
358 free(u->meta.instance);
363 UnitActiveState unit_active_state(Unit *u) {
366 if (u->meta.load_state != UNIT_LOADED)
367 return UNIT_INACTIVE;
369 return UNIT_VTABLE(u)->active_state(u);
372 const char* unit_sub_state_to_string(Unit *u) {
375 return UNIT_VTABLE(u)->sub_state_to_string(u);
378 static void complete_move(Set **s, Set **other) {
386 set_move(*s, *other);
393 static void merge_names(Unit *u, Unit *other) {
400 complete_move(&u->meta.names, &other->meta.names);
402 while ((t = set_steal_first(other->meta.names)))
405 set_free(other->meta.names);
406 other->meta.names = NULL;
407 other->meta.id = NULL;
409 SET_FOREACH(t, u->meta.names, i)
410 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
413 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
420 assert(d < _UNIT_DEPENDENCY_MAX);
422 SET_FOREACH(back, other->meta.dependencies[d], i) {
425 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
426 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
429 set_remove(back->meta.dependencies[k], other);
431 assert(r == -ENOENT);
435 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
437 set_free(other->meta.dependencies[d]);
438 other->meta.dependencies[d] = NULL;
441 int unit_merge(Unit *u, Unit *other) {
446 assert(u->meta.manager == other->meta.manager);
447 assert(u->meta.type != _UNIT_TYPE_INVALID);
449 other = unit_follow_merge(other);
454 if (u->meta.type != other->meta.type)
457 if (!streq_ptr(u->meta.instance, other->meta.instance))
460 if (other->meta.load_state != UNIT_STUB &&
461 other->meta.load_state != UNIT_FAILED)
467 if (unit_active_state(other) != UNIT_INACTIVE)
471 merge_names(u, other);
473 /* Merge dependencies */
474 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
475 merge_dependencies(u, other, d);
477 other->meta.load_state = UNIT_MERGED;
478 other->meta.merged_into = u;
480 /* If there is still some data attached to the other node, we
481 * don't need it anymore, and can free it. */
482 if (other->meta.load_state != UNIT_STUB)
483 if (UNIT_VTABLE(other)->done)
484 UNIT_VTABLE(other)->done(other);
486 unit_add_to_dbus_queue(u);
487 unit_add_to_cleanup_queue(other);
492 int unit_merge_by_name(Unit *u, const char *name) {
500 if (unit_name_is_template(name)) {
501 if (!u->meta.instance)
504 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
510 if (!(other = manager_get_unit(u->meta.manager, name)))
511 r = unit_add_name(u, name);
513 r = unit_merge(u, other);
519 Unit* unit_follow_merge(Unit *u) {
522 while (u->meta.load_state == UNIT_MERGED)
523 assert_se(u = u->meta.merged_into);
528 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
534 if (c->std_output != EXEC_OUTPUT_KERNEL && c->std_output != EXEC_OUTPUT_SYSLOG)
537 /* If syslog or kernel logging is requested, make sure our own
538 * logging daemon is run first. */
540 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
543 if (u->meta.manager->running_as != MANAGER_SESSION)
544 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
550 const char *unit_description(Unit *u) {
553 if (u->meta.description)
554 return u->meta.description;
559 void unit_dump(Unit *u, FILE *f, const char *prefix) {
567 timestamp1[FORMAT_TIMESTAMP_MAX],
568 timestamp2[FORMAT_TIMESTAMP_MAX],
569 timestamp3[FORMAT_TIMESTAMP_MAX],
570 timestamp4[FORMAT_TIMESTAMP_MAX];
573 assert(u->meta.type >= 0);
577 p2 = strappend(prefix, "\t");
578 prefix2 = p2 ? p2 : prefix;
582 "%s\tDescription: %s\n"
584 "%s\tUnit Load State: %s\n"
585 "%s\tUnit Active State: %s\n"
586 "%s\tInactive Exit Timestamp: %s\n"
587 "%s\tActive Enter Timestamp: %s\n"
588 "%s\tActive Exit Timestamp: %s\n"
589 "%s\tInactive Enter Timestamp: %s\n"
590 "%s\tGC Check Good: %s\n",
592 prefix, unit_description(u),
593 prefix, strna(u->meta.instance),
594 prefix, unit_load_state_to_string(u->meta.load_state),
595 prefix, unit_active_state_to_string(unit_active_state(u)),
596 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp)),
597 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp)),
598 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp)),
599 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp)),
600 prefix, yes_no(unit_check_gc(u)));
602 SET_FOREACH(t, u->meta.names, i)
603 fprintf(f, "%s\tName: %s\n", prefix, t);
605 if (u->meta.fragment_path)
606 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
608 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
611 SET_FOREACH(other, u->meta.dependencies[d], i)
612 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
615 if (u->meta.load_state == UNIT_LOADED) {
617 "%s\tRecursive Stop: %s\n"
618 "%s\tStop When Unneeded: %s\n",
619 prefix, yes_no(u->meta.recursive_stop),
620 prefix, yes_no(u->meta.stop_when_unneeded));
622 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
623 fprintf(f, "%s\tControlGroup: %s:%s\n",
624 prefix, b->controller, b->path);
626 if (UNIT_VTABLE(u)->dump)
627 UNIT_VTABLE(u)->dump(u, f, prefix2);
629 } else if (u->meta.load_state == UNIT_MERGED)
631 "%s\tMerged into: %s\n",
632 prefix, u->meta.merged_into->meta.id);
635 job_dump(u->meta.job, f, prefix2);
640 /* Common implementation for multiple backends */
641 int unit_load_fragment_and_dropin(Unit *u) {
646 /* Load a .service file */
647 if ((r = unit_load_fragment(u)) < 0)
650 if (u->meta.load_state == UNIT_STUB)
653 /* Load drop-in directory data */
654 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
660 /* Common implementation for multiple backends */
661 int unit_load_fragment_and_dropin_optional(Unit *u) {
666 /* Same as unit_load_fragment_and_dropin(), but whether
667 * something can be loaded or not doesn't matter. */
669 /* Load a .service file */
670 if ((r = unit_load_fragment(u)) < 0)
673 if (u->meta.load_state == UNIT_STUB)
674 u->meta.load_state = UNIT_LOADED;
676 /* Load drop-in directory data */
677 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
683 /* Common implementation for multiple backends */
684 int unit_load_nop(Unit *u) {
687 if (u->meta.load_state == UNIT_STUB)
688 u->meta.load_state = UNIT_LOADED;
693 int unit_load(Unit *u) {
698 if (u->meta.in_load_queue) {
699 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
700 u->meta.in_load_queue = false;
703 if (u->meta.type == _UNIT_TYPE_INVALID)
706 if (u->meta.load_state != UNIT_STUB)
709 if (UNIT_VTABLE(u)->load)
710 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
713 if (u->meta.load_state == UNIT_STUB) {
718 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
720 unit_add_to_dbus_queue(unit_follow_merge(u));
721 unit_add_to_gc_queue(u);
726 u->meta.load_state = UNIT_FAILED;
727 unit_add_to_dbus_queue(u);
729 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
735 * -EBADR: This unit type does not support starting.
736 * -EALREADY: Unit is already started.
737 * -EAGAIN: An operation is already in progress. Retry later.
739 int unit_start(Unit *u) {
740 UnitActiveState state;
744 /* If this is already (being) started, then this will
745 * succeed. Note that this will even succeed if this unit is
746 * not startable by the user. This is relied on to detect when
747 * we need to wait for units and when waiting is finished. */
748 state = unit_active_state(u);
749 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
752 /* If it is stopped, but we cannot start it, then fail */
753 if (!UNIT_VTABLE(u)->start)
756 /* We don't suppress calls to ->start() here when we are
757 * already starting, to allow this request to be used as a
758 * "hurry up" call, for example when the unit is in some "auto
759 * restart" state where it waits for a holdoff timer to elapse
760 * before it will start again. */
762 unit_add_to_dbus_queue(u);
763 return UNIT_VTABLE(u)->start(u);
766 bool unit_can_start(Unit *u) {
769 return !!UNIT_VTABLE(u)->start;
773 * -EBADR: This unit type does not support stopping.
774 * -EALREADY: Unit is already stopped.
775 * -EAGAIN: An operation is already in progress. Retry later.
777 int unit_stop(Unit *u) {
778 UnitActiveState state;
782 state = unit_active_state(u);
783 if (state == UNIT_INACTIVE)
786 if (!UNIT_VTABLE(u)->stop)
789 unit_add_to_dbus_queue(u);
790 return UNIT_VTABLE(u)->stop(u);
794 * -EBADR: This unit type does not support reloading.
795 * -ENOEXEC: Unit is not started.
796 * -EAGAIN: An operation is already in progress. Retry later.
798 int unit_reload(Unit *u) {
799 UnitActiveState state;
803 if (!unit_can_reload(u))
806 state = unit_active_state(u);
807 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
810 if (unit_active_state(u) != UNIT_ACTIVE)
813 unit_add_to_dbus_queue(u);
814 return UNIT_VTABLE(u)->reload(u);
817 bool unit_can_reload(Unit *u) {
820 if (!UNIT_VTABLE(u)->reload)
823 if (!UNIT_VTABLE(u)->can_reload)
826 return UNIT_VTABLE(u)->can_reload(u);
829 static void unit_check_uneeded(Unit *u) {
835 /* If this service shall be shut down when unneeded then do
838 if (!u->meta.stop_when_unneeded)
841 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
844 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
845 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
848 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
849 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
852 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
853 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
856 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
858 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
859 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
862 static void retroactively_start_dependencies(Unit *u) {
867 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
869 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
870 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
871 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
873 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
874 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
875 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
877 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
878 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
879 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
881 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
882 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
883 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
885 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
886 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
887 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
890 static void retroactively_stop_dependencies(Unit *u) {
895 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
897 if (u->meta.recursive_stop) {
898 /* Pull down units need us recursively if enabled */
899 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
900 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
901 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
904 /* Garbage collect services that might not be needed anymore, if enabled */
905 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
906 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
907 unit_check_uneeded(other);
908 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
909 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
910 unit_check_uneeded(other);
911 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
912 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
913 unit_check_uneeded(other);
914 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
915 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
916 unit_check_uneeded(other);
917 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
918 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
919 unit_check_uneeded(other);
922 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
923 bool unexpected = false;
927 assert(os < _UNIT_ACTIVE_STATE_MAX);
928 assert(ns < _UNIT_ACTIVE_STATE_MAX);
930 /* Note that this is called for all low-level state changes,
931 * even if they might map to the same high-level
932 * UnitActiveState! That means that ns == os is OK an expected
933 * behaviour here. For example: if a mount point is remounted
934 * this function will be called too and the utmp code below
937 ts = now(CLOCK_REALTIME);
939 if (os == UNIT_INACTIVE && ns != UNIT_INACTIVE)
940 u->meta.inactive_exit_timestamp = ts;
941 else if (os != UNIT_INACTIVE && ns == UNIT_INACTIVE)
942 u->meta.inactive_enter_timestamp = ts;
944 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
945 u->meta.active_enter_timestamp = ts;
946 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
947 u->meta.active_exit_timestamp = ts;
951 if (u->meta.job->state == JOB_WAITING)
953 /* So we reached a different state for this
954 * job. Let's see if we can run it now if it
955 * failed previously due to EAGAIN. */
956 job_add_to_run_queue(u->meta.job);
959 assert(u->meta.job->state == JOB_RUNNING);
961 /* Let's check whether this state change
962 * constitutes a finished job, or maybe
963 * cotradicts a running job and hence needs to
964 * invalidate jobs. */
966 switch (u->meta.job->type) {
969 case JOB_VERIFY_ACTIVE:
971 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
972 job_finish_and_invalidate(u->meta.job, true);
973 else if (ns != UNIT_ACTIVATING) {
975 job_finish_and_invalidate(u->meta.job, false);
981 case JOB_RELOAD_OR_START:
983 if (ns == UNIT_ACTIVE)
984 job_finish_and_invalidate(u->meta.job, true);
985 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
987 job_finish_and_invalidate(u->meta.job, false);
994 case JOB_TRY_RESTART:
996 if (ns == UNIT_INACTIVE)
997 job_finish_and_invalidate(u->meta.job, true);
998 else if (ns != UNIT_DEACTIVATING) {
1000 job_finish_and_invalidate(u->meta.job, false);
1006 assert_not_reached("Job type unknown");
1011 /* If this state change happened without being requested by a
1012 * job, then let's retroactively start or stop dependencies */
1015 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1016 retroactively_start_dependencies(u);
1017 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1018 retroactively_stop_dependencies(u);
1021 /* Some names are special */
1022 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1023 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
1024 /* The bus just might have become available,
1025 * hence try to connect to it, if we aren't
1027 bus_init_system(u->meta.manager);
1028 bus_init_api(u->meta.manager);
1031 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1032 /* The syslog daemon just might have become
1033 * available, hence try to connect to it, if
1034 * we aren't yet connected. */
1037 if (u->meta.type == UNIT_MOUNT)
1038 /* Another directory became available, let's
1039 * check if that is enough to write our utmp
1041 manager_write_utmp_reboot(u->meta.manager);
1043 if (u->meta.type == UNIT_TARGET)
1044 /* A target got activated, maybe this is a runlevel? */
1045 manager_write_utmp_runlevel(u->meta.manager, u);
1047 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1049 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1050 /* The syslog daemon might just have
1051 * terminated, hence try to disconnect from
1055 /* We don't care about D-Bus here, since we'll get an
1056 * asynchronous notification for it anyway. */
1059 /* Maybe we finished startup and are now ready for being
1060 * stopped because unneeded? */
1061 unit_check_uneeded(u);
1063 unit_add_to_dbus_queue(u);
1064 unit_add_to_gc_queue(u);
1067 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1068 struct epoll_event ev;
1073 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1079 if (epoll_ctl(u->meta.manager->epoll_fd,
1080 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1092 void unit_unwatch_fd(Unit *u, Watch *w) {
1096 if (w->type == WATCH_INVALID)
1099 assert(w->type == WATCH_FD);
1100 assert(w->data.unit == u);
1101 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1104 w->type = WATCH_INVALID;
1105 w->data.unit = NULL;
1108 int unit_watch_pid(Unit *u, pid_t pid) {
1112 /* Watch a specific PID. We only support one unit watching
1113 * each PID for now. */
1115 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1118 void unit_unwatch_pid(Unit *u, pid_t pid) {
1122 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1125 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1126 struct itimerspec its;
1132 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1134 /* This will try to reuse the old timer if there is one */
1136 if (w->type == WATCH_TIMER) {
1141 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1148 /* Set absolute time in the past, but not 0, since we
1149 * don't want to disarm the timer */
1150 its.it_value.tv_sec = 0;
1151 its.it_value.tv_nsec = 1;
1153 flags = TFD_TIMER_ABSTIME;
1155 timespec_store(&its.it_value, delay);
1159 /* This will also flush the elapse counter */
1160 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1163 if (w->type == WATCH_INVALID) {
1164 struct epoll_event ev;
1168 ev.events = EPOLLIN;
1170 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1175 w->type = WATCH_TIMER;
1182 close_nointr_nofail(fd);
1187 void unit_unwatch_timer(Unit *u, Watch *w) {
1191 if (w->type == WATCH_INVALID)
1194 assert(w->type == WATCH_TIMER && w->data.unit == u);
1196 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1197 close_nointr_nofail(w->fd);
1200 w->type = WATCH_INVALID;
1201 w->data.unit = NULL;
1204 bool unit_job_is_applicable(Unit *u, JobType j) {
1206 assert(j >= 0 && j < _JOB_TYPE_MAX);
1210 case JOB_VERIFY_ACTIVE:
1216 case JOB_TRY_RESTART:
1217 return unit_can_start(u);
1220 return unit_can_reload(u);
1222 case JOB_RELOAD_OR_START:
1223 return unit_can_reload(u) && unit_can_start(u);
1226 assert_not_reached("Invalid job type");
1230 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1232 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1233 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1234 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1235 [UNIT_WANTS] = UNIT_WANTED_BY,
1236 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1237 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1238 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1239 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1240 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1241 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1242 [UNIT_BEFORE] = UNIT_AFTER,
1243 [UNIT_AFTER] = UNIT_BEFORE,
1244 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1245 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1247 int r, q = 0, v = 0, w = 0;
1250 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1251 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1254 /* We won't allow dependencies on ourselves. We will not
1255 * consider them an error however. */
1259 if (UNIT_VTABLE(u)->no_requires &&
1260 (d == UNIT_REQUIRES ||
1261 d == UNIT_REQUIRES_OVERRIDABLE ||
1262 d == UNIT_REQUISITE ||
1263 d == UNIT_REQUISITE_OVERRIDABLE)) {
1267 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0 ||
1268 (r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1272 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1273 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1276 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1279 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1284 if (add_reference) {
1285 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1290 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1294 unit_add_to_dbus_queue(u);
1299 set_remove(u->meta.dependencies[d], other);
1302 set_remove(other->meta.dependencies[inverse_table[d]], u);
1305 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1310 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1314 assert(name || path);
1317 name = file_name_from_path(path);
1319 if (!unit_name_is_template(name)) {
1324 if (u->meta.instance)
1325 s = unit_name_replace_instance(name, u->meta.instance);
1329 if (!(i = unit_name_to_prefix(u->meta.id)))
1332 s = unit_name_replace_instance(name, i);
1343 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1349 assert(name || path);
1351 if (!(name = resolve_template(u, name, path, &s)))
1354 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1357 r = unit_add_dependency(u, d, other, add_reference);
1364 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1370 assert(name || path);
1372 if (!(name = resolve_template(u, name, path, &s)))
1375 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1378 r = unit_add_dependency(other, d, u, add_reference);
1385 int set_unit_path(const char *p) {
1389 /* This is mostly for debug purposes */
1391 if (path_is_absolute(p)) {
1392 if (!(c = strdup(p)))
1395 if (!(cwd = get_current_dir_name()))
1398 r = asprintf(&c, "%s/%s", cwd, p);
1405 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1414 char *unit_dbus_path(Unit *u) {
1419 if (!(e = bus_path_escape(u->meta.id)))
1422 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1431 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1439 /* Ensure this hasn't been added yet */
1442 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1443 LIST_PREPEND(CGroupBonding, by_path, l, b);
1445 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1446 LIST_REMOVE(CGroupBonding, by_path, l, b);
1450 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1456 static char *default_cgroup_path(Unit *u) {
1462 if (u->meta.instance) {
1465 if (!(t = unit_name_template(u->meta.id)))
1468 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1471 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1473 return r < 0 ? NULL : p;
1476 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1478 char *controller = NULL, *path = NULL;
1479 CGroupBonding *b = NULL;
1485 /* Detect controller name */
1486 n = strcspn(name, ":");
1489 (name[n] == ':' && name[n+1] == 0)) {
1491 /* Only controller name, no path? */
1493 if (!(path = default_cgroup_path(u)))
1499 /* Controller name, and path. */
1502 if (!path_is_absolute(p))
1505 if (!(path = strdup(p)))
1510 controller = strndup(name, n);
1512 controller = strdup(u->meta.manager->cgroup_controller);
1519 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1524 if (!(b = new0(CGroupBonding, 1))) {
1529 b->controller = controller;
1532 b->clean_up = false;
1534 if ((r = unit_add_cgroup(u, b)) < 0)
1547 int unit_add_default_cgroup(Unit *u) {
1553 /* Adds in the default cgroup data, if it wasn't specified yet */
1555 if (unit_get_default_cgroup(u))
1558 if (!(b = new0(CGroupBonding, 1)))
1561 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1564 if (!(b->path = default_cgroup_path(u)))
1570 if ((r = unit_add_cgroup(u, b)) < 0)
1577 free(b->controller);
1583 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1586 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1589 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1597 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1600 assert(!unit_has_name(u, t));
1602 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1605 assert(r < 0 || *_found != u);
1610 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1618 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1621 assert(!unit_has_name(u, t));
1623 found = manager_get_unit(u->meta.manager, t);
1633 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1637 return unit_name_to_prefix_and_instance(u->meta.id);
1640 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1644 return unit_name_to_prefix(u->meta.id);
1647 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1653 if (!(p = unit_name_to_prefix(u->meta.id)))
1656 r = unit_name_unescape(p);
1662 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1666 if (u->meta.instance)
1667 return unit_name_unescape(u->meta.instance);
1672 char *unit_name_printf(Unit *u, const char* format) {
1675 * This will use the passed string as format string and
1676 * replace the following specifiers:
1678 * %n: the full id of the unit (foo@bar.waldo)
1679 * %N: the id of the unit without the suffix (foo@bar)
1680 * %p: the prefix (foo)
1681 * %i: the instance (bar)
1684 const Specifier table[] = {
1685 { 'n', specifier_string, u->meta.id },
1686 { 'N', specifier_prefix_and_instance, NULL },
1687 { 'p', specifier_prefix, NULL },
1688 { 'i', specifier_string, u->meta.instance },
1695 return specifier_printf(format, table, u);
1698 char *unit_full_printf(Unit *u, const char *format) {
1700 /* This is similar to unit_name_printf() but also supports
1703 const Specifier table[] = {
1704 { 'n', specifier_string, u->meta.id },
1705 { 'N', specifier_prefix_and_instance, NULL },
1706 { 'p', specifier_prefix, NULL },
1707 { 'P', specifier_prefix_unescaped, NULL },
1708 { 'i', specifier_string, u->meta.instance },
1709 { 'I', specifier_instance_unescaped, NULL },
1716 return specifier_printf(format, table, u);
1719 char **unit_full_printf_strv(Unit *u, char **l) {
1723 /* Applies unit_full_printf to every entry in l */
1728 if (!(r = new(char*, n+1)))
1731 for (i = l, j = r; *i; i++, j++)
1732 if (!(*j = unit_full_printf(u, *i)))
1748 int unit_watch_bus_name(Unit *u, const char *name) {
1752 /* Watch a specific name on the bus. We only support one unit
1753 * watching each name for now. */
1755 return hashmap_put(u->meta.manager->watch_bus, name, u);
1758 void unit_unwatch_bus_name(Unit *u, const char *name) {
1762 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1765 bool unit_can_serialize(Unit *u) {
1768 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1771 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1778 if (!unit_can_serialize(u))
1781 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1789 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1800 va_start(ap, format);
1801 vfprintf(f, format, ap);
1807 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1813 fprintf(f, "%s=%s\n", key, value);
1816 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1823 if (!unit_can_serialize(u))
1827 char line[1024], *l, *v;
1830 if (!fgets(line, sizeof(line), f)) {
1842 k = strcspn(l, "=");
1850 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1855 int unit_add_node_link(Unit *u, const char *what, bool wants) {
1865 /* Adds in links to the device node that this unit is based on */
1867 if (!is_device_path(what))
1870 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
1873 r = manager_load_unit(u->meta.manager, e, NULL, &device);
1879 if ((r = unit_add_dependency(u, UNIT_AFTER, device, true)) < 0)
1882 if ((r = unit_add_dependency(u, UNIT_REQUIRES, device, true)) < 0)
1886 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
1892 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1893 [UNIT_SERVICE] = "service",
1894 [UNIT_TIMER] = "timer",
1895 [UNIT_SOCKET] = "socket",
1896 [UNIT_TARGET] = "target",
1897 [UNIT_DEVICE] = "device",
1898 [UNIT_MOUNT] = "mount",
1899 [UNIT_AUTOMOUNT] = "automount",
1900 [UNIT_SNAPSHOT] = "snapshot",
1901 [UNIT_SWAP] = "swap"
1904 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1906 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1907 [UNIT_STUB] = "stub",
1908 [UNIT_LOADED] = "loaded",
1909 [UNIT_FAILED] = "failed",
1910 [UNIT_MERGED] = "merged"
1913 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1915 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1916 [UNIT_ACTIVE] = "active",
1917 [UNIT_INACTIVE] = "inactive",
1918 [UNIT_ACTIVATING] = "activating",
1919 [UNIT_DEACTIVATING] = "deactivating"
1922 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1924 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1925 [UNIT_REQUIRES] = "Requires",
1926 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1927 [UNIT_WANTS] = "Wants",
1928 [UNIT_REQUISITE] = "Requisite",
1929 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1930 [UNIT_REQUIRED_BY] = "RequiredBy",
1931 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1932 [UNIT_WANTED_BY] = "WantedBy",
1933 [UNIT_CONFLICTS] = "Conflicts",
1934 [UNIT_BEFORE] = "Before",
1935 [UNIT_AFTER] = "After",
1936 [UNIT_REFERENCES] = "References",
1937 [UNIT_REFERENCED_BY] = "ReferencedBy"
1940 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1942 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1943 [KILL_CONTROL_GROUP] = "control-group",
1944 [KILL_PROCESS_GROUP] = "process-group",
1945 [KILL_PROCESS] = "process",
1946 [KILL_NONE] = "none"
1949 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);