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>
27 #include <sys/signalfd.h>
32 #include <sys/reboot.h>
33 #include <sys/ioctl.h>
35 #include <libcgroup.h>
45 #include "ratelimit.h"
47 #include "mount-setup.h"
48 #include "utmp-wtmp.h"
49 #include "unit-name.h"
50 #include "dbus-unit.h"
53 static int enable_special_signals(Manager *m) {
58 /* Enable that we get SIGINT on control-alt-del */
59 if (reboot(RB_DISABLE_CAD) < 0)
60 log_warning("Failed to enable ctrl-alt-del handling: %m");
62 if ((fd = open_terminal("/dev/tty0", O_RDWR)) < 0)
63 log_warning("Failed to open /dev/tty0: %m");
65 /* Enable that we get SIGWINCH on kbrequest */
66 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
67 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
69 close_nointr_nofail(fd);
75 static int manager_setup_signals(Manager *m) {
77 struct epoll_event ev;
82 /* We are not interested in SIGSTOP and friends. */
84 sa.sa_handler = SIG_DFL;
85 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
86 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
88 assert_se(sigemptyset(&mask) == 0);
89 assert_se(sigaddset(&mask, SIGCHLD) == 0);
90 assert_se(sigaddset(&mask, SIGTERM) == 0);
91 assert_se(sigaddset(&mask, SIGHUP) == 0);
92 assert_se(sigaddset(&mask, SIGUSR1) == 0);
93 assert_se(sigaddset(&mask, SIGUSR2) == 0);
94 assert_se(sigaddset(&mask, SIGINT) == 0); /* Kernel sends us this on control-alt-del */
95 assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */
96 assert_se(sigaddset(&mask, SIGPWR) == 0); /* Some kernel drivers and upsd send us this on power failure */
97 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
99 m->signal_watch.type = WATCH_SIGNAL;
100 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
105 ev.data.ptr = &m->signal_watch;
107 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
110 if (m->running_as == MANAGER_INIT)
111 return enable_special_signals(m);
116 static char** session_dirs(void) {
117 const char *home, *e;
118 char *config_home = NULL, *data_home = NULL;
119 char **config_dirs = NULL, **data_dirs = NULL;
120 char **r = NULL, **t;
122 /* Implement the mechanisms defined in
124 * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
126 * We look in both the config and the data dirs because we
127 * want to encourage that distributors ship their unit files
128 * as data, and allow overriding as configuration.
131 home = getenv("HOME");
133 if ((e = getenv("XDG_CONFIG_HOME"))) {
134 if (asprintf(&config_home, "%s/systemd/session", e) < 0)
138 if (asprintf(&config_home, "%s/.config/systemd/session", home) < 0)
142 if ((e = getenv("XDG_CONFIG_DIRS")))
143 config_dirs = strv_split(e, ":");
145 config_dirs = strv_new("/etc/xdg", NULL);
150 if ((e = getenv("XDG_DATA_HOME"))) {
151 if (asprintf(&data_home, "%s/systemd/session", e) < 0)
155 if (asprintf(&data_home, "%s/.local/share/systemd/session", home) < 0)
159 if ((e = getenv("XDG_DATA_DIRS")))
160 data_dirs = strv_split(e, ":");
162 data_dirs = strv_new("/usr/local/share", "/usr/share", NULL);
167 /* Now merge everything we found. */
169 if (!(t = strv_append(r, config_home)))
175 if (!(t = strv_merge_concat(r, config_dirs, "/systemd/session")))
180 if (!(t = strv_append(r, SESSION_CONFIG_UNIT_PATH)))
186 if (!(t = strv_append(r, data_home)))
192 if (!(t = strv_merge_concat(r, data_dirs, "/systemd/session")))
197 if (!(t = strv_append(r, SESSION_DATA_UNIT_PATH)))
202 if (!strv_path_make_absolute_cwd(r))
207 strv_free(config_dirs);
209 strv_free(data_dirs);
219 static int manager_find_paths(Manager *m) {
225 /* First priority is whatever has been passed to us via env
227 if ((e = getenv("SYSTEMD_UNIT_PATH")))
228 if (!(m->unit_path = split_path_and_make_absolute(e)))
231 if (strv_isempty(m->unit_path)) {
233 /* Nothing is set, so let's figure something out. */
234 strv_free(m->unit_path);
236 if (m->running_as == MANAGER_SESSION) {
237 if (!(m->unit_path = session_dirs()))
240 if (!(m->unit_path = strv_new(
241 SYSTEM_CONFIG_UNIT_PATH, /* /etc/systemd/system/ */
242 SYSTEM_DATA_UNIT_PATH, /* /lib/systemd/system/ */
247 if (m->running_as == MANAGER_INIT) {
248 /* /etc/init.d/ compativility does not matter to users */
250 if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
251 if (!(m->sysvinit_path = split_path_and_make_absolute(e)))
254 if (strv_isempty(m->sysvinit_path)) {
255 strv_free(m->sysvinit_path);
257 if (!(m->sysvinit_path = strv_new(
258 SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
263 if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
264 if (!(m->sysvrcnd_path = split_path_and_make_absolute(e)))
267 if (strv_isempty(m->sysvrcnd_path)) {
268 strv_free(m->sysvrcnd_path);
270 if (!(m->sysvrcnd_path = strv_new(
271 SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
277 strv_uniq(m->unit_path);
278 strv_uniq(m->sysvinit_path);
279 strv_uniq(m->sysvrcnd_path);
281 assert(!strv_isempty(m->unit_path));
282 if (!(t = strv_join(m->unit_path, "\n\t")))
284 log_debug("Looking for unit files in:\n\t%s", t);
287 if (!strv_isempty(m->sysvinit_path)) {
289 if (!(t = strv_join(m->sysvinit_path, "\n\t")))
292 log_debug("Looking for SysV init scripts in:\n\t%s", t);
295 log_debug("Ignoring SysV init scripts.");
297 if (!strv_isempty(m->sysvrcnd_path)) {
299 if (!(t = strv_join(m->sysvrcnd_path, "\n\t")))
302 log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
305 log_debug("Ignoring SysV rcN.d links.");
310 int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **_m) {
315 assert(running_as >= 0);
316 assert(running_as < _MANAGER_RUNNING_AS_MAX);
318 if (!(m = new0(Manager, 1)))
321 m->boot_timestamp = now(CLOCK_REALTIME);
323 m->running_as = running_as;
324 m->confirm_spawn = confirm_spawn;
325 m->name_data_slot = -1;
327 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = -1;
328 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
330 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
333 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
336 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
339 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
342 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
345 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
348 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
351 if ((r = manager_find_paths(m)) < 0)
354 if ((r = manager_setup_signals(m)) < 0)
357 if ((r = manager_setup_cgroup(m)) < 0)
360 /* Try to connect to the busses, if possible. */
361 if ((r = bus_init_system(m)) < 0 ||
362 (r = bus_init_api(m)) < 0)
373 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
379 while ((meta = m->cleanup_queue)) {
380 assert(meta->in_cleanup_queue);
382 unit_free(UNIT(meta));
389 void manager_free(Manager *m) {
396 while ((j = hashmap_first(m->transaction_jobs)))
399 while ((u = hashmap_first(m->units)))
402 manager_dispatch_cleanup_queue(m);
404 for (c = 0; c < _UNIT_TYPE_MAX; c++)
405 if (unit_vtable[c]->shutdown)
406 unit_vtable[c]->shutdown(m);
408 manager_shutdown_cgroup(m);
413 hashmap_free(m->units);
414 hashmap_free(m->jobs);
415 hashmap_free(m->transaction_jobs);
416 hashmap_free(m->watch_pids);
417 hashmap_free(m->watch_bus);
419 if (m->epoll_fd >= 0)
420 close_nointr(m->epoll_fd);
421 if (m->signal_watch.fd >= 0)
422 close_nointr(m->signal_watch.fd);
424 strv_free(m->unit_path);
425 strv_free(m->sysvinit_path);
426 strv_free(m->sysvrcnd_path);
428 free(m->cgroup_controller);
429 free(m->cgroup_hierarchy);
431 assert(hashmap_isempty(m->cgroup_bondings));
432 hashmap_free(m->cgroup_bondings);
437 int manager_coldplug(Manager *m) {
446 /* First, let's ask every type to load all units from
447 * disk/kernel that it might know */
448 for (c = 0; c < _UNIT_TYPE_MAX; c++)
449 if (unit_vtable[c]->enumerate)
450 if ((r = unit_vtable[c]->enumerate(m)) < 0)
453 manager_dispatch_load_queue(m);
455 /* Then, let's set up their initial state. */
456 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
462 if (UNIT_VTABLE(u)->coldplug)
463 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
467 /* Now that the initial devices are available, let's see if we
468 * can write the utmp file */
469 manager_write_utmp_reboot(m);
474 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
478 /* Deletes one job from the transaction */
480 manager_transaction_unlink_job(m, j, delete_dependencies);
486 static void transaction_delete_unit(Manager *m, Unit *u) {
489 /* Deletes all jobs associated with a certain unit from the
492 while ((j = hashmap_get(m->transaction_jobs, u)))
493 transaction_delete_job(m, j, true);
496 static void transaction_clean_dependencies(Manager *m) {
502 /* Drops all dependencies of all installed jobs */
504 HASHMAP_FOREACH(j, m->jobs, i) {
505 while (j->subject_list)
506 job_dependency_free(j->subject_list);
507 while (j->object_list)
508 job_dependency_free(j->object_list);
511 assert(!m->transaction_anchor);
514 static void transaction_abort(Manager *m) {
519 while ((j = hashmap_first(m->transaction_jobs)))
521 transaction_delete_job(m, j, true);
525 assert(hashmap_isempty(m->transaction_jobs));
527 transaction_clean_dependencies(m);
530 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
535 /* A recursive sweep through the graph that marks all units
536 * that matter to the anchor job, i.e. are directly or
537 * indirectly a dependency of the anchor job via paths that
538 * are fully marked as mattering. */
543 l = m->transaction_anchor;
545 LIST_FOREACH(subject, l, l) {
547 /* This link does not matter */
551 /* This unit has already been marked */
552 if (l->object->generation == generation)
555 l->object->matters_to_anchor = true;
556 l->object->generation = generation;
558 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
562 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
563 JobDependency *l, *last;
567 assert(j->unit == other->unit);
568 assert(!j->installed);
570 /* Merges 'other' into 'j' and then deletes j. */
573 j->state = JOB_WAITING;
574 j->override = j->override || other->override;
576 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
578 /* Patch us in as new owner of the JobDependency objects */
580 LIST_FOREACH(subject, l, other->subject_list) {
581 assert(l->subject == other);
586 /* Merge both lists */
588 last->subject_next = j->subject_list;
590 j->subject_list->subject_prev = last;
591 j->subject_list = other->subject_list;
594 /* Patch us in as new owner of the JobDependency objects */
596 LIST_FOREACH(object, l, other->object_list) {
597 assert(l->object == other);
602 /* Merge both lists */
604 last->object_next = j->object_list;
606 j->object_list->object_prev = last;
607 j->object_list = other->object_list;
610 /* Kill the other job */
611 other->subject_list = NULL;
612 other->object_list = NULL;
613 transaction_delete_job(m, other, true);
616 static int delete_one_unmergeable_job(Manager *m, Job *j) {
621 /* Tries to delete one item in the linked list
622 * j->transaction_next->transaction_next->... that conflicts
623 * whith another one, in an attempt to make an inconsistent
624 * transaction work. */
626 /* We rely here on the fact that if a merged with b does not
627 * merge with c, either a or b merge with c neither */
628 LIST_FOREACH(transaction, j, j)
629 LIST_FOREACH(transaction, k, j->transaction_next) {
632 /* Is this one mergeable? Then skip it */
633 if (job_type_is_mergeable(j->type, k->type))
636 /* Ok, we found two that conflict, let's see if we can
637 * drop one of them */
638 if (!j->matters_to_anchor)
640 else if (!k->matters_to_anchor)
645 /* Ok, we can drop one, so let's do so. */
646 log_debug("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
647 transaction_delete_job(m, d, true);
654 static int transaction_merge_jobs(Manager *m) {
661 /* First step, check whether any of the jobs for one specific
662 * task conflict. If so, try to drop one of them. */
663 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
668 LIST_FOREACH(transaction, k, j->transaction_next) {
669 if ((r = job_type_merge(&t, k->type)) >= 0)
672 /* OK, we could not merge all jobs for this
673 * action. Let's see if we can get rid of one
676 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
677 /* Ok, we managed to drop one, now
678 * let's ask our callers to call us
679 * again after garbage collecting */
682 /* We couldn't merge anything. Failure */
687 /* Second step, merge the jobs. */
688 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
692 /* Merge all transactions */
693 LIST_FOREACH(transaction, k, j->transaction_next)
694 assert_se(job_type_merge(&t, k->type) == 0);
696 /* If an active job is mergeable, merge it too */
697 if (j->unit->meta.job)
698 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
700 while ((k = j->transaction_next)) {
702 transaction_merge_and_delete_job(m, k, j, t);
705 transaction_merge_and_delete_job(m, j, k, t);
708 assert(!j->transaction_next);
709 assert(!j->transaction_prev);
715 static void transaction_drop_redundant(Manager *m) {
720 /* Goes through the transaction and removes all jobs that are
729 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
730 bool changes_something = false;
733 LIST_FOREACH(transaction, k, j) {
735 if (!job_is_anchor(k) &&
736 job_type_is_redundant(k->type, unit_active_state(k->unit)))
739 changes_something = true;
743 if (changes_something)
746 log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
747 transaction_delete_job(m, j, false);
755 static bool unit_matters_to_anchor(Unit *u, Job *j) {
757 assert(!j->transaction_prev);
759 /* Checks whether at least one of the jobs for this unit
760 * matters to the anchor. */
762 LIST_FOREACH(transaction, j, j)
763 if (j->matters_to_anchor)
769 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
776 assert(!j->transaction_prev);
778 /* Does a recursive sweep through the ordering graph, looking
779 * for a cycle. If we find cycle we try to break it. */
781 /* Did we find a cycle? */
782 if (j->marker && j->generation == generation) {
785 /* So, we already have been here. We have a
786 * cycle. Let's try to break it. We go backwards in
787 * our path and try to find a suitable job to
788 * remove. We use the marker to find our way back,
789 * since smart how we are we stored our way back in
792 log_debug("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
794 for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) {
796 log_debug("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
799 !unit_matters_to_anchor(k->unit, k)) {
800 /* Ok, we can drop this one, so let's
802 log_debug("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
803 transaction_delete_unit(m, k->unit);
807 /* Check if this in fact was the beginning of
813 log_debug("Unable to break cycle");
818 /* Make the marker point to where we come from, so that we can
819 * find our way backwards if we want to break a cycle */
821 j->generation = generation;
823 /* We assume that the the dependencies are bidirectional, and
824 * hence can ignore UNIT_AFTER */
825 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
828 /* Is there a job for this unit? */
829 if (!(o = hashmap_get(m->transaction_jobs, u)))
831 /* Ok, there is no job for this in the
832 * transaction, but maybe there is already one
834 if (!(o = u->meta.job))
837 if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
841 /* Ok, let's backtrack, and remember that this entry is not on
842 * our path anymore. */
848 static int transaction_verify_order(Manager *m, unsigned *generation) {
856 /* Check if the ordering graph is cyclic. If it is, try to fix
857 * that up by dropping one of the jobs. */
859 HASHMAP_FOREACH(j, m->transaction_jobs, i)
860 if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0)
866 static void transaction_collect_garbage(Manager *m) {
871 /* Drop jobs that are not required by any other job */
879 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
883 log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
884 transaction_delete_job(m, j, true);
892 static int transaction_is_destructive(Manager *m, JobMode mode) {
898 /* Checks whether applying this transaction means that
899 * existing jobs would be replaced */
901 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
904 assert(!j->transaction_prev);
905 assert(!j->transaction_next);
907 if (j->unit->meta.job &&
908 j->unit->meta.job != j &&
909 !job_type_is_superset(j->type, j->unit->meta.job->type))
916 static void transaction_minimize_impact(Manager *m) {
920 /* Drops all unnecessary jobs that reverse already active jobs
921 * or that stop a running service. */
929 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
930 LIST_FOREACH(transaction, j, j) {
931 bool stops_running_service, changes_existing_job;
933 /* If it matters, we shouldn't drop it */
934 if (j->matters_to_anchor)
937 /* Would this stop a running service?
938 * Would this change an existing job?
939 * If so, let's drop this entry */
941 stops_running_service =
942 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
944 changes_existing_job =
945 j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
947 if (!stops_running_service && !changes_existing_job)
950 if (stops_running_service)
951 log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
953 if (changes_existing_job)
954 log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
956 /* Ok, let's get rid of this */
957 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
959 transaction_delete_job(m, j, true);
971 static int transaction_apply(Manager *m, JobMode mode) {
976 /* Moves the transaction jobs to the set of active jobs */
978 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
980 assert(!j->transaction_prev);
981 assert(!j->transaction_next);
986 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
990 while ((j = hashmap_steal_first(m->transaction_jobs))) {
994 if (j->unit->meta.job)
995 job_free(j->unit->meta.job);
997 j->unit->meta.job = j;
1000 /* We're fully installed. Now let's free data we don't
1003 assert(!j->transaction_next);
1004 assert(!j->transaction_prev);
1006 job_add_to_run_queue(j);
1007 job_add_to_dbus_queue(j);
1010 /* As last step, kill all remaining job dependencies. */
1011 transaction_clean_dependencies(m);
1017 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1021 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1027 static int transaction_activate(Manager *m, JobMode mode) {
1029 unsigned generation = 1;
1033 /* This applies the changes recorded in transaction_jobs to
1034 * the actual list of jobs, if possible. */
1036 /* First step: figure out which jobs matter */
1037 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1039 /* Second step: Try not to stop any running services if
1040 * we don't have to. Don't try to reverse running
1041 * jobs if we don't have to. */
1042 transaction_minimize_impact(m);
1044 /* Third step: Drop redundant jobs */
1045 transaction_drop_redundant(m);
1048 /* Fourth step: Let's remove unneeded jobs that might
1050 transaction_collect_garbage(m);
1052 /* Fifth step: verify order makes sense and correct
1053 * cycles if necessary and possible */
1054 if ((r = transaction_verify_order(m, &generation)) >= 0)
1058 log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
1062 /* Let's see if the resulting transaction ordering
1063 * graph is still cyclic... */
1067 /* Sixth step: let's drop unmergeable entries if
1068 * necessary and possible, merge entries we can
1070 if ((r = transaction_merge_jobs(m)) >= 0)
1074 log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
1078 /* Seventh step: an entry got dropped, let's garbage
1079 * collect its dependencies. */
1080 transaction_collect_garbage(m);
1082 /* Let's see if the resulting transaction still has
1083 * unmergeable entries ... */
1086 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1087 transaction_drop_redundant(m);
1089 /* Ninth step: check whether we can actually apply this */
1090 if (mode == JOB_FAIL)
1091 if ((r = transaction_is_destructive(m, mode)) < 0) {
1092 log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
1096 /* Tenth step: apply changes */
1097 if ((r = transaction_apply(m, mode)) < 0) {
1098 log_debug("Failed to apply transaction: %s", strerror(-r));
1102 assert(hashmap_isempty(m->transaction_jobs));
1103 assert(!m->transaction_anchor);
1108 transaction_abort(m);
1112 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1119 /* Looks for an axisting prospective job and returns that. If
1120 * it doesn't exist it is created and added to the prospective
1123 f = hashmap_get(m->transaction_jobs, unit);
1125 LIST_FOREACH(transaction, j, f) {
1126 assert(j->unit == unit);
1128 if (j->type == type) {
1135 if (unit->meta.job && unit->meta.job->type == type)
1137 else if (!(j = job_new(m, type, unit)))
1142 j->matters_to_anchor = false;
1143 j->override = override;
1145 LIST_PREPEND(Job, transaction, f, j);
1147 if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1155 log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1160 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1164 if (j->transaction_prev)
1165 j->transaction_prev->transaction_next = j->transaction_next;
1166 else if (j->transaction_next)
1167 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1169 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1171 if (j->transaction_next)
1172 j->transaction_next->transaction_prev = j->transaction_prev;
1174 j->transaction_prev = j->transaction_next = NULL;
1176 while (j->subject_list)
1177 job_dependency_free(j->subject_list);
1179 while (j->object_list) {
1180 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1182 job_dependency_free(j->object_list);
1184 if (other && delete_dependencies) {
1185 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1186 other->unit->meta.id, job_type_to_string(other->type),
1187 j->unit->meta.id, job_type_to_string(j->type));
1188 transaction_delete_job(m, other, delete_dependencies);
1193 static int transaction_add_job_and_dependencies(
1208 assert(type < _JOB_TYPE_MAX);
1211 if (unit->meta.load_state != UNIT_LOADED)
1214 if (!unit_job_is_applicable(unit, type))
1217 /* First add the job. */
1218 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1221 /* Then, add a link to the job. */
1222 if (!job_dependency_new(by, ret, matters))
1226 /* Finally, recursively add in all dependencies. */
1227 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1228 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1229 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1232 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1233 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1234 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1236 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1237 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0)
1238 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1240 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1241 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1244 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1245 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1246 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1248 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1249 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1252 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1254 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1255 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1259 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1271 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) {
1276 assert(type < _JOB_TYPE_MAX);
1278 assert(mode < _JOB_MODE_MAX);
1280 log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
1282 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) {
1283 transaction_abort(m);
1287 if ((r = transaction_activate(m, mode)) < 0)
1290 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1298 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, Job **_ret) {
1303 assert(type < _JOB_TYPE_MAX);
1305 assert(mode < _JOB_MODE_MAX);
1307 if ((r = manager_load_unit(m, name, NULL, &unit)) < 0)
1310 return manager_add_job(m, type, unit, mode, override, _ret);
1313 Job *manager_get_job(Manager *m, uint32_t id) {
1316 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1319 Unit *manager_get_unit(Manager *m, const char *name) {
1323 return hashmap_get(m->units, name);
1326 unsigned manager_dispatch_load_queue(Manager *m) {
1332 /* Make sure we are not run recursively */
1333 if (m->dispatching_load_queue)
1336 m->dispatching_load_queue = true;
1338 /* Dispatches the load queue. Takes a unit from the queue and
1339 * tries to load its data until the queue is empty */
1341 while ((meta = m->load_queue)) {
1342 assert(meta->in_load_queue);
1344 unit_load(UNIT(meta));
1348 m->dispatching_load_queue = false;
1352 int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) {
1357 assert(name || path);
1359 /* This will load the service information files, but not actually
1360 * start any services or anything. */
1362 if (path && !is_path(path))
1366 name = file_name_from_path(path);
1368 if (!unit_name_is_valid(name))
1371 if ((ret = manager_get_unit(m, name))) {
1376 if (!(ret = unit_new(m)))
1380 if (!(ret->meta.fragment_path = strdup(path))) {
1385 if ((r = unit_add_name(ret, name)) < 0) {
1390 unit_add_to_load_queue(ret);
1391 unit_add_to_dbus_queue(ret);
1393 manager_dispatch_load_queue(m);
1396 *_ret = unit_follow_merge(ret);
1401 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1408 HASHMAP_FOREACH(j, s->jobs, i)
1409 job_dump(j, f, prefix);
1412 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1420 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1421 if (u->meta.id == t)
1422 unit_dump(u, f, prefix);
1425 void manager_clear_jobs(Manager *m) {
1430 transaction_abort(m);
1432 while ((j = hashmap_first(m->jobs)))
1436 unsigned manager_dispatch_run_queue(Manager *m) {
1440 if (m->dispatching_run_queue)
1443 m->dispatching_run_queue = true;
1445 while ((j = m->run_queue)) {
1446 assert(j->installed);
1447 assert(j->in_run_queue);
1449 job_run_and_invalidate(j);
1453 m->dispatching_run_queue = false;
1457 unsigned manager_dispatch_dbus_queue(Manager *m) {
1464 if (m->dispatching_dbus_queue)
1467 m->dispatching_dbus_queue = true;
1469 while ((meta = m->dbus_unit_queue)) {
1470 assert(meta->in_dbus_queue);
1472 bus_unit_send_change_signal(UNIT(meta));
1476 while ((j = m->dbus_job_queue)) {
1477 assert(j->in_dbus_queue);
1479 bus_job_send_change_signal(j);
1483 m->dispatching_dbus_queue = false;
1487 static int manager_dispatch_sigchld(Manager *m) {
1496 /* First we call waitd() for a PID and do not reap the
1497 * zombie. That way we can still access /proc/$PID for
1498 * it while it is a zombie. */
1499 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1501 if (errno == ECHILD)
1513 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1516 get_process_name(si.si_pid, &name);
1517 log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si.si_pid, strna(name));
1521 /* And now, we actually reap the zombie. */
1522 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1529 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1532 log_debug("Child %llu died (code=%s, status=%i/%s)",
1533 (long long unsigned) si.si_pid,
1534 sigchld_code_to_string(si.si_code),
1536 strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
1538 if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
1541 log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
1543 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1549 static void manager_start_target(Manager *m, const char *name) {
1552 if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_REPLACE, true, NULL)) < 0)
1553 log_error("Failed to enqueue %s job: %s", name, strerror(-r));
1556 static int manager_process_signal_fd(Manager *m, bool *quit) {
1558 struct signalfd_siginfo sfsi;
1559 bool sigchld = false;
1564 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1569 if (errno == EAGAIN)
1575 switch (sfsi.ssi_signo) {
1584 if (m->running_as == MANAGER_INIT) {
1585 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET);
1594 if (m->running_as == MANAGER_INIT)
1595 manager_start_target(m, SPECIAL_KBREQUEST_TARGET);
1597 /* This is a nop on non-init */
1601 if (m->running_as == MANAGER_INIT)
1602 manager_start_target(m, SPECIAL_SIGPWR_TARGET);
1604 /* This is a nop on non-init */
1608 manager_dump_units(m, stdout, "\t");
1609 manager_dump_jobs(m, stdout, "\t");
1615 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1617 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
1618 log_info("Trying to reconnect to bus...");
1623 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
1624 log_info("Loading D-Bus service...");
1625 manager_start_target(m, SPECIAL_DBUS_SERVICE);
1632 log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
1637 return manager_dispatch_sigchld(m);
1642 static int process_event(Manager *m, struct epoll_event *ev, bool *quit) {
1649 assert(w = ev->data.ptr);
1655 /* An incoming signal? */
1656 if (ev->events != EPOLLIN)
1659 if ((r = manager_process_signal_fd(m, quit)) < 0)
1666 /* Some fd event, to be dispatched to the units */
1667 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1674 /* Some timer event, to be dispatched to the units */
1675 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1677 if (k < 0 && (errno == EINTR || errno == EAGAIN))
1680 return k < 0 ? -errno : -EIO;
1683 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1688 /* Some mount table change, intended for the mount subsystem */
1689 mount_fd_event(m, ev->events);
1693 /* Some notification from udev, intended for the device subsystem */
1694 device_fd_event(m, ev->events);
1697 case WATCH_DBUS_WATCH:
1698 bus_watch_event(m, w, ev->events);
1701 case WATCH_DBUS_TIMEOUT:
1702 bus_timeout_event(m, w, ev->events);
1706 assert_not_reached("Unknown epoll event type.");
1712 int manager_loop(Manager *m) {
1716 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
1721 struct epoll_event event;
1724 if (!ratelimit_test(&rl)) {
1725 /* Yay, something is going seriously wrong, pause a little */
1726 log_warning("Looping too fast. Throttling execution a little.");
1730 if (manager_dispatch_cleanup_queue(m) > 0)
1733 if (manager_dispatch_load_queue(m) > 0)
1736 if (manager_dispatch_run_queue(m) > 0)
1739 if (bus_dispatch(m) > 0)
1742 if (manager_dispatch_dbus_queue(m) > 0)
1745 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
1747 if (errno == -EINTR)
1755 if ((r = process_event(m, &event, &quit)) < 0)
1762 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
1770 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
1773 if (!(n = bus_path_unescape(s+31)))
1776 u = manager_get_unit(m, n);
1787 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
1796 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
1799 if ((r = safe_atou(s + 30, &id)) < 0)
1802 if (!(j = manager_get_job(m, id)))
1810 static bool manager_utmp_good(Manager *m) {
1815 if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
1818 log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
1826 void manager_write_utmp_reboot(Manager *m) {
1831 if (m->utmp_reboot_written)
1834 if (m->running_as != MANAGER_INIT)
1837 if (!manager_utmp_good(m))
1840 if ((r = utmp_put_reboot(m->boot_timestamp)) < 0) {
1842 if (r != -ENOENT && r != -EROFS)
1843 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
1848 m->utmp_reboot_written = true;
1851 void manager_write_utmp_runlevel(Manager *m, Unit *u) {
1857 if (u->meta.type != UNIT_TARGET)
1860 if (m->running_as != MANAGER_INIT)
1863 if (!manager_utmp_good(m))
1866 if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
1869 if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
1871 if (r != -ENOENT && r != -EROFS)
1872 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
1876 void manager_dispatch_bus_name_owner_changed(
1879 const char* old_owner,
1880 const char *new_owner) {
1887 if (!(u = hashmap_get(m->watch_bus, name)))
1890 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
1893 void manager_dispatch_bus_query_pid_done(
1904 if (!(u = hashmap_get(m->watch_bus, name)))
1907 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
1910 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
1911 [MANAGER_INIT] = "init",
1912 [MANAGER_SYSTEM] = "system",
1913 [MANAGER_SESSION] = "session"
1916 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);