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 void unit_add_to_load_queue(Unit *u) {
209 assert(u->meta.type != _UNIT_TYPE_INVALID);
211 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
214 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
215 u->meta.in_load_queue = true;
218 void unit_add_to_cleanup_queue(Unit *u) {
221 if (u->meta.in_cleanup_queue)
224 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
225 u->meta.in_cleanup_queue = true;
228 void unit_add_to_dbus_queue(Unit *u) {
230 assert(u->meta.type != _UNIT_TYPE_INVALID);
232 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
235 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
236 u->meta.in_dbus_queue = true;
239 static void bidi_set_free(Unit *u, Set *s) {
245 /* Frees the set and makes sure we are dropped from the
246 * inverse pointers */
248 SET_FOREACH(other, s, i) {
251 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
252 set_remove(other->meta.dependencies[d], u);
258 void unit_free(Unit *u) {
265 bus_unit_send_removed_signal(u);
267 /* Detach from next 'bigger' objects */
268 SET_FOREACH(t, u->meta.names, i)
269 hashmap_remove_value(u->meta.manager->units, t, u);
271 if (u->meta.type != _UNIT_TYPE_INVALID)
272 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
274 if (u->meta.in_load_queue)
275 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
277 if (u->meta.in_dbus_queue)
278 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
280 if (u->meta.in_cleanup_queue)
281 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
283 /* Free data and next 'smaller' objects */
285 job_free(u->meta.job);
287 if (u->meta.load_state != UNIT_STUB)
288 if (UNIT_VTABLE(u)->done)
289 UNIT_VTABLE(u)->done(u);
291 cgroup_bonding_free_list(u->meta.cgroup_bondings);
293 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
294 bidi_set_free(u, u->meta.dependencies[d]);
296 free(u->meta.description);
297 free(u->meta.fragment_path);
299 while ((t = set_steal_first(u->meta.names)))
301 set_free(u->meta.names);
303 free(u->meta.instance);
308 UnitActiveState unit_active_state(Unit *u) {
311 if (u->meta.load_state != UNIT_LOADED)
312 return UNIT_INACTIVE;
314 return UNIT_VTABLE(u)->active_state(u);
317 const char* unit_sub_state_to_string(Unit *u) {
320 return UNIT_VTABLE(u)->sub_state_to_string(u);
323 static void complete_move(Set **s, Set **other) {
331 set_move(*s, *other);
338 static void merge_names(Unit *u, Unit *other) {
345 complete_move(&u->meta.names, &other->meta.names);
347 while ((t = set_steal_first(other->meta.names)))
350 set_free(other->meta.names);
351 other->meta.names = NULL;
352 other->meta.id = NULL;
354 SET_FOREACH(t, u->meta.names, i)
355 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
358 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
365 assert(d < _UNIT_DEPENDENCY_MAX);
367 SET_FOREACH(back, other->meta.dependencies[d], i) {
370 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
371 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
374 set_remove(back->meta.dependencies[k], other);
376 assert(r == -ENOENT);
380 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
382 set_free(other->meta.dependencies[d]);
383 other->meta.dependencies[d] = NULL;
386 int unit_merge(Unit *u, Unit *other) {
391 assert(u->meta.manager == other->meta.manager);
392 assert(u->meta.type != _UNIT_TYPE_INVALID);
394 other = unit_follow_merge(other);
399 if (u->meta.type != other->meta.type)
402 if (!streq_ptr(u->meta.instance, other->meta.instance))
405 if (other->meta.load_state != UNIT_STUB &&
406 other->meta.load_state != UNIT_FAILED)
412 if (unit_active_state(other) != UNIT_INACTIVE)
416 merge_names(u, other);
418 /* Merge dependencies */
419 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
420 merge_dependencies(u, other, d);
422 other->meta.load_state = UNIT_MERGED;
423 other->meta.merged_into = u;
425 /* If there is still some data attached to the other node, we
426 * don't need it anymore, and can free it. */
427 if (other->meta.load_state != UNIT_STUB)
428 if (UNIT_VTABLE(other)->done)
429 UNIT_VTABLE(other)->done(other);
431 unit_add_to_dbus_queue(u);
432 unit_add_to_cleanup_queue(other);
437 int unit_merge_by_name(Unit *u, const char *name) {
445 if (unit_name_is_template(name)) {
446 if (!u->meta.instance)
449 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
455 if (!(other = manager_get_unit(u->meta.manager, name)))
456 r = unit_add_name(u, name);
458 r = unit_merge(u, other);
464 Unit* unit_follow_merge(Unit *u) {
467 while (u->meta.load_state == UNIT_MERGED)
468 assert_se(u = u->meta.merged_into);
473 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
479 if (c->std_output != EXEC_OUTPUT_KERNEL && c->std_output != EXEC_OUTPUT_SYSLOG)
482 /* If syslog or kernel logging is requested, make sure our own
483 * logging daemon is run first. */
485 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL)) < 0)
488 if (u->meta.manager->running_as != MANAGER_SESSION)
489 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL)) < 0)
495 const char *unit_description(Unit *u) {
498 if (u->meta.description)
499 return u->meta.description;
504 void unit_dump(Unit *u, FILE *f, const char *prefix) {
511 char timestamp1[FORMAT_TIMESTAMP_MAX], timestamp2[FORMAT_TIMESTAMP_MAX];
514 assert(u->meta.type >= 0);
518 p2 = strappend(prefix, "\t");
519 prefix2 = p2 ? p2 : prefix;
523 "%s\tDescription: %s\n"
525 "%s\tUnit Load State: %s\n"
526 "%s\tUnit Active State: %s\n"
527 "%s\tActive Enter Timestamp: %s\n"
528 "%s\tActive Exit Timestamp: %s\n",
530 prefix, unit_description(u),
531 prefix, strna(u->meta.instance),
532 prefix, unit_load_state_to_string(u->meta.load_state),
533 prefix, unit_active_state_to_string(unit_active_state(u)),
534 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.active_enter_timestamp)),
535 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_exit_timestamp)));
537 SET_FOREACH(t, u->meta.names, i)
538 fprintf(f, "%s\tName: %s\n", prefix, t);
540 if (u->meta.fragment_path)
541 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
543 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
546 SET_FOREACH(other, u->meta.dependencies[d], i)
547 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
550 if (u->meta.load_state == UNIT_LOADED) {
552 "%s\tRecursive Stop: %s\n"
553 "%s\tStop When Unneeded: %s\n",
554 prefix, yes_no(u->meta.recursive_stop),
555 prefix, yes_no(u->meta.stop_when_unneeded));
557 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
558 fprintf(f, "%s\tControlGroup: %s:%s\n",
559 prefix, b->controller, b->path);
561 if (UNIT_VTABLE(u)->dump)
562 UNIT_VTABLE(u)->dump(u, f, prefix2);
564 } else if (u->meta.load_state == UNIT_MERGED)
566 "%s\tMerged into: %s\n",
567 prefix, u->meta.merged_into->meta.id);
570 job_dump(u->meta.job, f, prefix2);
575 /* Common implementation for multiple backends */
576 int unit_load_fragment_and_dropin(Unit *u) {
581 /* Load a .service file */
582 if ((r = unit_load_fragment(u)) < 0)
585 if (u->meta.load_state == UNIT_STUB)
588 /* Load drop-in directory data */
589 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
595 /* Common implementation for multiple backends */
596 int unit_load_fragment_and_dropin_optional(Unit *u) {
601 /* Same as unit_load_fragment_and_dropin(), but whether
602 * something can be loaded or not doesn't matter. */
604 /* Load a .service file */
605 if ((r = unit_load_fragment(u)) < 0)
608 if (u->meta.load_state == UNIT_STUB)
609 u->meta.load_state = UNIT_LOADED;
611 /* Load drop-in directory data */
612 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
618 /* Common implementation for multiple backends */
619 int unit_load_nop(Unit *u) {
622 if (u->meta.load_state == UNIT_STUB)
623 u->meta.load_state = UNIT_LOADED;
628 int unit_load(Unit *u) {
633 if (u->meta.in_load_queue) {
634 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
635 u->meta.in_load_queue = false;
638 if (u->meta.type == _UNIT_TYPE_INVALID)
641 if (u->meta.load_state != UNIT_STUB)
644 if (UNIT_VTABLE(u)->load)
645 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
648 if (u->meta.load_state == UNIT_STUB) {
653 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
655 unit_add_to_dbus_queue(unit_follow_merge(u));
660 u->meta.load_state = UNIT_FAILED;
661 unit_add_to_dbus_queue(u);
663 log_error("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
669 * -EBADR: This unit type does not support starting.
670 * -EALREADY: Unit is already started.
671 * -EAGAIN: An operation is already in progress. Retry later.
673 int unit_start(Unit *u) {
674 UnitActiveState state;
678 /* If this is already (being) started, then this will
679 * succeed. Note that this will even succeed if this unit is
680 * not startable by the user. This is relied on to detect when
681 * we need to wait for units and when waiting is finished. */
682 state = unit_active_state(u);
683 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
686 /* If it is stopped, but we cannot start it, then fail */
687 if (!UNIT_VTABLE(u)->start)
690 /* We don't suppress calls to ->start() here when we are
691 * already starting, to allow this request to be used as a
692 * "hurry up" call, for example when the unit is in some "auto
693 * restart" state where it waits for a holdoff timer to elapse
694 * before it will start again. */
696 unit_add_to_dbus_queue(u);
697 return UNIT_VTABLE(u)->start(u);
700 bool unit_can_start(Unit *u) {
703 return !!UNIT_VTABLE(u)->start;
707 * -EBADR: This unit type does not support stopping.
708 * -EALREADY: Unit is already stopped.
709 * -EAGAIN: An operation is already in progress. Retry later.
711 int unit_stop(Unit *u) {
712 UnitActiveState state;
716 state = unit_active_state(u);
717 if (state == UNIT_INACTIVE)
720 if (!UNIT_VTABLE(u)->stop)
723 unit_add_to_dbus_queue(u);
724 return UNIT_VTABLE(u)->stop(u);
728 * -EBADR: This unit type does not support reloading.
729 * -ENOEXEC: Unit is not started.
730 * -EAGAIN: An operation is already in progress. Retry later.
732 int unit_reload(Unit *u) {
733 UnitActiveState state;
737 if (!unit_can_reload(u))
740 state = unit_active_state(u);
741 if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
744 if (unit_active_state(u) != UNIT_ACTIVE)
747 unit_add_to_dbus_queue(u);
748 return UNIT_VTABLE(u)->reload(u);
751 bool unit_can_reload(Unit *u) {
754 if (!UNIT_VTABLE(u)->reload)
757 if (!UNIT_VTABLE(u)->can_reload)
760 return UNIT_VTABLE(u)->can_reload(u);
763 static void unit_check_uneeded(Unit *u) {
769 /* If this service shall be shut down when unneeded then do
772 if (!u->meta.stop_when_unneeded)
775 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
778 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
779 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
782 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
783 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
786 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
787 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
790 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
792 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
793 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
796 static void retroactively_start_dependencies(Unit *u) {
801 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
803 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
804 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
805 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
807 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
808 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
809 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
811 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
812 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
813 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
815 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
816 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
817 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
819 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
820 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
821 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
824 static void retroactively_stop_dependencies(Unit *u) {
829 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
831 if (u->meta.recursive_stop) {
832 /* Pull down units need us recursively if enabled */
833 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
834 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
835 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
838 /* Garbage collect services that might not be needed anymore, if enabled */
839 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
840 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
841 unit_check_uneeded(other);
842 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
843 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
844 unit_check_uneeded(other);
845 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
846 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
847 unit_check_uneeded(other);
848 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
849 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
850 unit_check_uneeded(other);
851 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
852 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
853 unit_check_uneeded(other);
856 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
857 bool unexpected = false;
860 assert(os < _UNIT_ACTIVE_STATE_MAX);
861 assert(ns < _UNIT_ACTIVE_STATE_MAX);
863 /* Note that this is called for all low-level state changes,
864 * even if they might map to the same high-level
865 * UnitActiveState! That means that ns == os is OK an expected
866 * behaviour here. For example: if a mount point is remounted
867 * this function will be called too and the utmp code below
870 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
871 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
872 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
873 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
877 if (u->meta.job->state == JOB_WAITING)
879 /* So we reached a different state for this
880 * job. Let's see if we can run it now if it
881 * failed previously due to EAGAIN. */
882 job_add_to_run_queue(u->meta.job);
885 assert(u->meta.job->state == JOB_RUNNING);
887 /* Let's check whether this state change
888 * constitutes a finished job, or maybe
889 * cotradicts a running job and hence needs to
890 * invalidate jobs. */
892 switch (u->meta.job->type) {
895 case JOB_VERIFY_ACTIVE:
897 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
898 job_finish_and_invalidate(u->meta.job, true);
899 else if (ns != UNIT_ACTIVATING) {
901 job_finish_and_invalidate(u->meta.job, false);
907 case JOB_RELOAD_OR_START:
909 if (ns == UNIT_ACTIVE)
910 job_finish_and_invalidate(u->meta.job, true);
911 else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) {
913 job_finish_and_invalidate(u->meta.job, false);
920 case JOB_TRY_RESTART:
922 if (ns == UNIT_INACTIVE)
923 job_finish_and_invalidate(u->meta.job, true);
924 else if (ns != UNIT_DEACTIVATING) {
926 job_finish_and_invalidate(u->meta.job, false);
932 assert_not_reached("Job type unknown");
937 /* If this state change happened without being requested by a
938 * job, then let's retroactively start or stop dependencies */
941 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
942 retroactively_start_dependencies(u);
943 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
944 retroactively_stop_dependencies(u);
947 /* Some names are special */
948 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
949 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
950 /* The bus just might have become available,
951 * hence try to connect to it, if we aren't
953 bus_init_system(u->meta.manager);
954 bus_init_api(u->meta.manager);
957 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
958 /* The syslog daemon just might have become
959 * available, hence try to connect to it, if
960 * we aren't yet connected. */
963 if (u->meta.type == UNIT_MOUNT)
964 /* Another directory became available, let's
965 * check if that is enough to write our utmp
967 manager_write_utmp_reboot(u->meta.manager);
969 if (u->meta.type == UNIT_TARGET)
970 /* A target got activated, maybe this is a runlevel? */
971 manager_write_utmp_runlevel(u->meta.manager, u);
973 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
975 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
976 /* The syslog daemon might just have
977 * terminated, hence try to disconnect from
981 /* We don't care about D-Bus here, since we'll get an
982 * asynchronous notification for it anyway. */
985 /* Maybe we finished startup and are now ready for being
986 * stopped because unneeded? */
987 unit_check_uneeded(u);
989 unit_add_to_dbus_queue(u);
992 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
993 struct epoll_event ev;
998 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1004 if (epoll_ctl(u->meta.manager->epoll_fd,
1005 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1017 void unit_unwatch_fd(Unit *u, Watch *w) {
1021 if (w->type == WATCH_INVALID)
1024 assert(w->type == WATCH_FD);
1025 assert(w->data.unit == u);
1026 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1029 w->type = WATCH_INVALID;
1030 w->data.unit = NULL;
1033 int unit_watch_pid(Unit *u, pid_t pid) {
1037 /* Watch a specific PID. We only support one unit watching
1038 * each PID for now. */
1040 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1043 void unit_unwatch_pid(Unit *u, pid_t pid) {
1047 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1050 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1051 struct itimerspec its;
1057 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1059 /* This will try to reuse the old timer if there is one */
1061 if (w->type == WATCH_TIMER) {
1066 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1073 /* Set absolute time in the past, but not 0, since we
1074 * don't want to disarm the timer */
1075 its.it_value.tv_sec = 0;
1076 its.it_value.tv_nsec = 1;
1078 flags = TFD_TIMER_ABSTIME;
1080 timespec_store(&its.it_value, delay);
1084 /* This will also flush the elapse counter */
1085 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1088 if (w->type == WATCH_INVALID) {
1089 struct epoll_event ev;
1093 ev.events = EPOLLIN;
1095 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1100 w->type = WATCH_TIMER;
1107 close_nointr_nofail(fd);
1112 void unit_unwatch_timer(Unit *u, Watch *w) {
1116 if (w->type == WATCH_INVALID)
1119 assert(w->type == WATCH_TIMER && w->data.unit == u);
1121 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1122 close_nointr_nofail(w->fd);
1125 w->type = WATCH_INVALID;
1126 w->data.unit = NULL;
1129 bool unit_job_is_applicable(Unit *u, JobType j) {
1131 assert(j >= 0 && j < _JOB_TYPE_MAX);
1135 case JOB_VERIFY_ACTIVE:
1141 case JOB_TRY_RESTART:
1142 return unit_can_start(u);
1145 return unit_can_reload(u);
1147 case JOB_RELOAD_OR_START:
1148 return unit_can_reload(u) && unit_can_start(u);
1151 assert_not_reached("Invalid job type");
1155 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1157 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1158 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1159 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1160 [UNIT_WANTS] = UNIT_WANTED_BY,
1161 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1162 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1163 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1164 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1165 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1166 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1167 [UNIT_BEFORE] = UNIT_AFTER,
1168 [UNIT_AFTER] = UNIT_BEFORE
1173 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1174 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1177 /* We won't allow dependencies on ourselves. We will not
1178 * consider them an error however. */
1182 if (UNIT_VTABLE(u)->no_requires &&
1183 (d == UNIT_REQUIRES ||
1184 d == UNIT_REQUIRES_OVERRIDABLE ||
1185 d == UNIT_REQUISITE ||
1186 d == UNIT_REQUISITE_OVERRIDABLE)) {
1190 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1193 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1196 if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1199 if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1200 set_remove(u->meta.dependencies[d], other);
1204 unit_add_to_dbus_queue(u);
1208 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1212 assert(name || path);
1215 name = file_name_from_path(path);
1217 if (!unit_name_is_template(name)) {
1222 if (u->meta.instance)
1223 s = unit_name_replace_instance(name, u->meta.instance);
1227 if (!(i = unit_name_to_prefix(u->meta.id)))
1230 s = unit_name_replace_instance(name, i);
1241 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path) {
1247 assert(name || path);
1249 if (!(name = resolve_template(u, name, path, &s)))
1252 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1255 r = unit_add_dependency(u, d, other);
1262 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path) {
1268 assert(name || path);
1270 if (!(name = resolve_template(u, name, path, &s)))
1273 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1276 r = unit_add_dependency(other, d, u);
1283 int set_unit_path(const char *p) {
1287 /* This is mostly for debug purposes */
1289 if (path_is_absolute(p)) {
1290 if (!(c = strdup(p)))
1293 if (!(cwd = get_current_dir_name()))
1296 r = asprintf(&c, "%s/%s", cwd, p);
1303 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1312 char *unit_dbus_path(Unit *u) {
1317 if (!(e = bus_path_escape(u->meta.id)))
1320 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1329 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1337 /* Ensure this hasn't been added yet */
1340 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1341 LIST_PREPEND(CGroupBonding, by_path, l, b);
1343 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1344 LIST_REMOVE(CGroupBonding, by_path, l, b);
1348 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1354 static char *default_cgroup_path(Unit *u) {
1360 if (u->meta.instance) {
1363 if (!(t = unit_name_template(u->meta.id)))
1366 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1369 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1371 return r < 0 ? NULL : p;
1374 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1376 char *controller = NULL, *path = NULL;
1377 CGroupBonding *b = NULL;
1383 /* Detect controller name */
1384 n = strcspn(name, ":");
1387 (name[n] == ':' && name[n+1] == 0)) {
1389 /* Only controller name, no path? */
1391 if (!(path = default_cgroup_path(u)))
1397 /* Controller name, and path. */
1400 if (!path_is_absolute(p))
1403 if (!(path = strdup(p)))
1408 controller = strndup(name, n);
1410 controller = strdup(u->meta.manager->cgroup_controller);
1417 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1422 if (!(b = new0(CGroupBonding, 1))) {
1427 b->controller = controller;
1430 b->clean_up = false;
1432 if ((r = unit_add_cgroup(u, b)) < 0)
1445 int unit_add_default_cgroup(Unit *u) {
1451 /* Adds in the default cgroup data, if it wasn't specified yet */
1453 if (unit_get_default_cgroup(u))
1456 if (!(b = new0(CGroupBonding, 1)))
1459 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1462 if (!(b->path = default_cgroup_path(u)))
1468 if ((r = unit_add_cgroup(u, b)) < 0)
1475 free(b->controller);
1481 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1484 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1487 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1495 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1498 assert(!unit_has_name(u, t));
1500 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1503 assert(r < 0 || *_found != u);
1508 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1516 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1519 assert(!unit_has_name(u, t));
1521 found = manager_get_unit(u->meta.manager, t);
1531 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1535 return unit_name_to_prefix_and_instance(u->meta.id);
1538 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1542 return unit_name_to_prefix(u->meta.id);
1545 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1551 if (!(p = unit_name_to_prefix(u->meta.id)))
1554 r = unit_name_unescape(p);
1560 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1564 if (u->meta.instance)
1565 return unit_name_unescape(u->meta.instance);
1570 char *unit_name_printf(Unit *u, const char* format) {
1573 * This will use the passed string as format string and
1574 * replace the following specifiers:
1576 * %n: the full id of the unit (foo@bar.waldo)
1577 * %N: the id of the unit without the suffix (foo@bar)
1578 * %p: the prefix (foo)
1579 * %i: the instance (bar)
1582 const Specifier table[] = {
1583 { 'n', specifier_string, u->meta.id },
1584 { 'N', specifier_prefix_and_instance, NULL },
1585 { 'p', specifier_prefix, NULL },
1586 { 'i', specifier_string, u->meta.instance },
1593 return specifier_printf(format, table, u);
1596 char *unit_full_printf(Unit *u, const char *format) {
1598 /* This is similar to unit_name_printf() but also supports
1601 const Specifier table[] = {
1602 { 'n', specifier_string, u->meta.id },
1603 { 'N', specifier_prefix_and_instance, NULL },
1604 { 'p', specifier_prefix, NULL },
1605 { 'P', specifier_prefix_unescaped, NULL },
1606 { 'i', specifier_string, u->meta.instance },
1607 { 'I', specifier_instance_unescaped, NULL },
1614 return specifier_printf(format, table, u);
1617 char **unit_full_printf_strv(Unit *u, char **l) {
1621 /* Applies unit_full_printf to every entry in l */
1626 if (!(r = new(char*, n+1)))
1629 for (i = l, j = r; *i; i++, j++)
1630 if (!(*j = unit_full_printf(u, *i)))
1646 int unit_watch_bus_name(Unit *u, const char *name) {
1650 /* Watch a specific name on the bus. We only support one unit
1651 * watching each name for now. */
1653 return hashmap_put(u->meta.manager->watch_bus, name, u);
1656 void unit_unwatch_bus_name(Unit *u, const char *name) {
1660 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1663 bool unit_can_serialize(Unit *u) {
1666 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1669 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1676 if (!unit_can_serialize(u))
1679 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1687 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1698 va_start(ap, format);
1699 vfprintf(f, format, ap);
1705 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1711 fprintf(f, "%s=%s\n", key, value);
1714 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1721 if (!unit_can_serialize(u))
1725 char line[1024], *l, *v;
1728 if (!fgets(line, sizeof(line), f)) {
1740 k = strcspn(l, "=");
1748 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1754 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1755 [UNIT_SERVICE] = "service",
1756 [UNIT_TIMER] = "timer",
1757 [UNIT_SOCKET] = "socket",
1758 [UNIT_TARGET] = "target",
1759 [UNIT_DEVICE] = "device",
1760 [UNIT_MOUNT] = "mount",
1761 [UNIT_AUTOMOUNT] = "automount",
1762 [UNIT_SNAPSHOT] = "snapshot"
1765 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1767 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1768 [UNIT_STUB] = "stub",
1769 [UNIT_LOADED] = "loaded",
1770 [UNIT_FAILED] = "failed",
1771 [UNIT_MERGED] = "merged"
1774 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1776 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1777 [UNIT_ACTIVE] = "active",
1778 [UNIT_INACTIVE] = "inactive",
1779 [UNIT_ACTIVATING] = "activating",
1780 [UNIT_DEACTIVATING] = "deactivating"
1783 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1785 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1786 [UNIT_REQUIRES] = "Requires",
1787 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1788 [UNIT_WANTS] = "Wants",
1789 [UNIT_REQUISITE] = "Requisite",
1790 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1791 [UNIT_REQUIRED_BY] = "RequiredBy",
1792 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1793 [UNIT_WANTED_BY] = "WantedBy",
1794 [UNIT_CONFLICTS] = "Conflicts",
1795 [UNIT_BEFORE] = "Before",
1796 [UNIT_AFTER] = "After",
1799 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1801 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1802 [KILL_CONTROL_GROUP] = "control-group",
1803 [KILL_PROCESS_GROUP] = "process-group",
1804 [KILL_PROCESS] = "process",
1805 [KILL_NONE] = "none"
1808 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);