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>
31 #include <sys/reboot.h>
32 #include <sys/ioctl.h>
41 #include "ratelimit.h"
43 static int manager_setup_signals(Manager *m) {
45 struct epoll_event ev;
49 assert_se(reset_all_signal_handlers() == 0);
51 assert_se(sigemptyset(&mask) == 0);
52 assert_se(sigaddset(&mask, SIGCHLD) == 0);
53 assert_se(sigaddset(&mask, SIGINT) == 0); /* Kernel sends us this on control-alt-del */
54 assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */
55 assert_se(sigaddset(&mask, SIGTERM) == 0);
56 assert_se(sigaddset(&mask, SIGHUP) == 0);
57 assert_se(sigaddset(&mask, SIGUSR1) == 0);
58 assert_se(sigaddset(&mask, SIGUSR2) == 0);
59 assert_se(sigaddset(&mask, SIGPIPE) == 0);
60 assert_se(sigaddset(&mask, SIGPWR) == 0);
61 assert_se(sigaddset(&mask, SIGTTIN) == 0);
62 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
64 m->signal_watch.type = WATCH_SIGNAL;
65 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
70 ev.data.ptr = &m->signal_watch;
72 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
75 if (m->running_as == MANAGER_INIT) {
76 /* Enable that we get SIGINT on control-alt-del */
77 if (reboot(RB_DISABLE_CAD) < 0)
78 log_warning("Failed to enable ctrl-alt-del handling: %s", strerror(errno));
80 /* Enable that we get SIGWINCH on kbrequest */
81 if (ioctl(0, KDSIGACCEPT, SIGWINCH) < 0)
82 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
88 static char** session_dirs(void) {
90 char *config_home = NULL, *data_home = NULL;
91 char **config_dirs = NULL, **data_dirs = NULL;
94 /* Implement the mechanisms defined in
96 * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
98 * We look in both the config and the data dirs because we
99 * want to encourage that distributors ship their unit files
100 * as data, and allow overriding as configuration.
103 home = getenv("HOME");
105 if ((e = getenv("XDG_CONFIG_HOME"))) {
106 if (asprintf(&config_home, "%s/systemd/session", e) < 0)
110 if (asprintf(&config_home, "%s/.config/systemd/session", home) < 0)
114 if ((e = getenv("XDG_CONFIG_DIRS")))
115 config_dirs = strv_split(e, ":");
117 config_dirs = strv_new("/etc/xdg", NULL);
122 if ((e = getenv("XDG_DATA_HOME"))) {
123 if (asprintf(&data_home, "%s/systemd/session", e) < 0)
127 if (asprintf(&data_home, "%s/.local/share/systemd/session", home) < 0)
131 if ((e = getenv("XDG_DATA_DIRS")))
132 data_dirs = strv_split(e, ":");
134 data_dirs = strv_new("/usr/local/share", "/usr/share", NULL);
139 /* Now merge everything we found. */
141 if (!(t = strv_append(r, config_home)))
147 if (!(t = strv_merge_concat(r, config_dirs, "/systemd/session")))
152 if (!(t = strv_append(r, SESSION_CONFIG_UNIT_PATH)))
158 if (!(t = strv_append(r, data_home)))
164 if (!(t = strv_merge_concat(r, data_dirs, "/systemd/session")))
169 if (!(t = strv_append(r, SESSION_DATA_UNIT_PATH)))
174 if (!strv_path_make_absolute_cwd(r))
179 strv_free(config_dirs);
181 strv_free(data_dirs);
191 static int manager_find_paths(Manager *m) {
196 /* First priority is whatever has been passed to us via env
198 if ((e = getenv("SYSTEMD_UNIT_PATH")))
199 if (!(m->unit_path = split_path_and_make_absolute(e)))
202 if (strv_isempty(m->unit_path)) {
204 /* Nothing is set, so let's figure something out. */
205 strv_free(m->unit_path);
207 if (m->running_as == MANAGER_SESSION) {
208 if (!(m->unit_path = session_dirs()))
211 if (!(m->unit_path = strv_new(
212 SYSTEM_CONFIG_UNIT_PATH, /* /etc/systemd/system/ */
213 SYSTEM_DATA_UNIT_PATH, /* /lib/systemd/system/ */
218 if (m->running_as == MANAGER_INIT) {
219 /* /etc/init.d/ compativility does not matter to users */
221 if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
222 if (!(m->sysvinit_path = split_path_and_make_absolute(e)))
225 if (strv_isempty(m->sysvinit_path)) {
226 strv_free(m->sysvinit_path);
228 if (!(m->sysvinit_path = strv_new(
229 SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
235 strv_uniq(m->unit_path);
236 strv_uniq(m->sysvinit_path);
238 assert(!strv_isempty(m->unit_path));
239 if (!(t = strv_join(m->unit_path, "\n\t")))
241 log_debug("Looking for unit files in:\n\t%s", t);
244 if (!strv_isempty(m->sysvinit_path)) {
246 if (!(t = strv_join(m->sysvinit_path, "\n\t")))
249 log_debug("Looking for SysV init scripts in:\n\t%s", t);
252 log_debug("Ignoring SysV init scripts.");
257 Manager* manager_new(void) {
260 if (!(m = new0(Manager, 1)))
263 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = -1;
264 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
266 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
269 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
272 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
275 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
278 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
282 m->running_as = MANAGER_INIT;
283 else if (getuid() == 0)
284 m->running_as = MANAGER_SYSTEM;
286 m->running_as = MANAGER_SESSION;
288 log_debug("systemd running in %s mode.", manager_running_as_to_string(m->running_as));
290 if (manager_find_paths(m) < 0)
294 log_warning("Failed to chdir to /: %s", strerror(errno));
296 /* Become a session leader if we aren't one yet. */
299 if (manager_setup_signals(m) < 0)
302 /* FIXME: this should be called only when the D-Bus bus daemon is running */
313 void manager_free(Manager *m) {
320 while ((j = hashmap_first(m->transaction_jobs)))
323 while ((u = hashmap_first(m->units)))
326 for (c = 0; c < _UNIT_TYPE_MAX; c++)
327 if (unit_vtable[c]->shutdown)
328 unit_vtable[c]->shutdown(m);
332 hashmap_free(m->units);
333 hashmap_free(m->jobs);
334 hashmap_free(m->transaction_jobs);
335 hashmap_free(m->watch_pids);
337 if (m->epoll_fd >= 0)
338 close_nointr(m->epoll_fd);
339 if (m->signal_watch.fd >= 0)
340 close_nointr(m->signal_watch.fd);
342 strv_free(m->unit_path);
343 strv_free(m->sysvinit_path);
348 int manager_coldplug(Manager *m) {
357 /* First, let's ask every type to load all units from
358 * disk/kernel that it might know */
359 for (c = 0; c < _UNIT_TYPE_MAX; c++)
360 if (unit_vtable[c]->enumerate)
361 if ((r = unit_vtable[c]->enumerate(m)) < 0)
364 manager_dispatch_load_queue(m);
366 /* Then, let's set up their initial state. */
367 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
373 if (UNIT_VTABLE(u)->coldplug)
374 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
381 static void transaction_delete_job(Manager *m, Job *j) {
385 /* Deletes one job from the transaction */
387 manager_transaction_unlink_job(m, j);
393 static void transaction_delete_unit(Manager *m, Unit *u) {
396 /* Deletes all jobs associated with a certain unit from the
399 while ((j = hashmap_get(m->transaction_jobs, u)))
400 transaction_delete_job(m, j);
403 static void transaction_clean_dependencies(Manager *m) {
409 /* Drops all dependencies of all installed jobs */
411 HASHMAP_FOREACH(j, m->jobs, i) {
412 while (j->subject_list)
413 job_dependency_free(j->subject_list);
414 while (j->object_list)
415 job_dependency_free(j->object_list);
418 assert(!m->transaction_anchor);
421 static void transaction_abort(Manager *m) {
426 while ((j = hashmap_first(m->transaction_jobs)))
428 transaction_delete_job(m, j);
432 assert(hashmap_isempty(m->transaction_jobs));
434 transaction_clean_dependencies(m);
437 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
442 /* A recursive sweep through the graph that marks all units
443 * that matter to the anchor job, i.e. are directly or
444 * indirectly a dependency of the anchor job via paths that
445 * are fully marked as mattering. */
450 l = m->transaction_anchor;
452 LIST_FOREACH(subject, l, l) {
454 /* This link does not matter */
458 /* This unit has already been marked */
459 if (l->object->generation == generation)
462 l->object->matters_to_anchor = true;
463 l->object->generation = generation;
465 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
469 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
470 JobDependency *l, *last;
474 assert(j->unit == other->unit);
475 assert(!j->installed);
477 /* Merges 'other' into 'j' and then deletes j. */
480 j->state = JOB_WAITING;
481 j->forced = j->forced || other->forced;
483 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
485 /* Patch us in as new owner of the JobDependency objects */
487 LIST_FOREACH(subject, l, other->subject_list) {
488 assert(l->subject == other);
493 /* Merge both lists */
495 last->subject_next = j->subject_list;
497 j->subject_list->subject_prev = last;
498 j->subject_list = other->subject_list;
501 /* Patch us in as new owner of the JobDependency objects */
503 LIST_FOREACH(object, l, other->object_list) {
504 assert(l->object == other);
509 /* Merge both lists */
511 last->object_next = j->object_list;
513 j->object_list->object_prev = last;
514 j->object_list = other->object_list;
517 /* Kill the other job */
518 other->subject_list = NULL;
519 other->object_list = NULL;
520 transaction_delete_job(m, other);
523 static int delete_one_unmergeable_job(Manager *m, Job *j) {
528 /* Tries to delete one item in the linked list
529 * j->transaction_next->transaction_next->... that conflicts
530 * whith another one, in an attempt to make an inconsistent
531 * transaction work. */
533 /* We rely here on the fact that if a merged with b does not
534 * merge with c, either a or b merge with c neither */
535 LIST_FOREACH(transaction, j, j)
536 LIST_FOREACH(transaction, k, j->transaction_next) {
539 /* Is this one mergeable? Then skip it */
540 if (job_type_is_mergeable(j->type, k->type))
543 /* Ok, we found two that conflict, let's see if we can
544 * drop one of them */
545 if (!j->matters_to_anchor)
547 else if (!k->matters_to_anchor)
552 /* Ok, we can drop one, so let's do so. */
553 log_debug("Try to fix job merging by deleting job %s/%s", unit_id(d->unit), job_type_to_string(d->type));
554 transaction_delete_job(m, d);
561 static int transaction_merge_jobs(Manager *m) {
568 /* First step, check whether any of the jobs for one specific
569 * task conflict. If so, try to drop one of them. */
570 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
575 LIST_FOREACH(transaction, k, j->transaction_next) {
576 if ((r = job_type_merge(&t, k->type)) >= 0)
579 /* OK, we could not merge all jobs for this
580 * action. Let's see if we can get rid of one
583 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
584 /* Ok, we managed to drop one, now
585 * let's ask our callers to call us
586 * again after garbage collecting */
589 /* We couldn't merge anything. Failure */
594 /* Second step, merge the jobs. */
595 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
599 /* Merge all transactions */
600 LIST_FOREACH(transaction, k, j->transaction_next)
601 assert_se(job_type_merge(&t, k->type) == 0);
603 /* If an active job is mergeable, merge it too */
604 if (j->unit->meta.job)
605 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
607 while ((k = j->transaction_next)) {
609 transaction_merge_and_delete_job(m, k, j, t);
612 transaction_merge_and_delete_job(m, j, k, t);
615 assert(!j->transaction_next);
616 assert(!j->transaction_prev);
622 static bool unit_matters_to_anchor(Unit *u, Job *j) {
624 assert(!j->transaction_prev);
626 /* Checks whether at least one of the jobs for this unit
627 * matters to the anchor. */
629 LIST_FOREACH(transaction, j, j)
630 if (j->matters_to_anchor)
636 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
643 assert(!j->transaction_prev);
645 /* Does a recursive sweep through the ordering graph, looking
646 * for a cycle. If we find cycle we try to break it. */
648 /* Did we find a cycle? */
649 if (j->marker && j->generation == generation) {
652 /* So, we already have been here. We have a
653 * cycle. Let's try to break it. We go backwards in
654 * our path and try to find a suitable job to
655 * remove. We use the marker to find our way back,
656 * since smart how we are we stored our way back in
659 log_debug("Found cycle on %s/%s", unit_id(j->unit), job_type_to_string(j->type));
661 for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) {
663 log_debug("Walked on cycle path to %s/%s", unit_id(j->unit), job_type_to_string(j->type));
666 !unit_matters_to_anchor(k->unit, k)) {
667 /* Ok, we can drop this one, so let's
669 log_debug("Breaking order cycle by deleting job %s/%s", unit_id(k->unit), job_type_to_string(k->type));
670 transaction_delete_unit(m, k->unit);
674 /* Check if this in fact was the beginning of
680 log_debug("Unable to break cycle");
685 /* Make the marker point to where we come from, so that we can
686 * find our way backwards if we want to break a cycle */
688 j->generation = generation;
690 /* We assume that the the dependencies are bidirectional, and
691 * hence can ignore UNIT_AFTER */
692 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
695 /* Is there a job for this unit? */
696 if (!(o = hashmap_get(m->transaction_jobs, u)))
698 /* Ok, there is no job for this in the
699 * transaction, but maybe there is already one
701 if (!(o = u->meta.job))
704 if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
708 /* Ok, let's backtrack, and remember that this entry is not on
709 * our path anymore. */
715 static int transaction_verify_order(Manager *m, unsigned *generation) {
723 /* Check if the ordering graph is cyclic. If it is, try to fix
724 * that up by dropping one of the jobs. */
726 HASHMAP_FOREACH(j, m->transaction_jobs, i)
727 if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0)
733 static void transaction_collect_garbage(Manager *m) {
738 /* Drop jobs that are not required by any other job */
746 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
750 log_debug("Garbage collecting job %s/%s", unit_id(j->unit), job_type_to_string(j->type));
751 transaction_delete_job(m, j);
759 static int transaction_is_destructive(Manager *m, JobMode mode) {
765 /* Checks whether applying this transaction means that
766 * existing jobs would be replaced */
768 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
771 assert(!j->transaction_prev);
772 assert(!j->transaction_next);
774 if (j->unit->meta.job &&
775 j->unit->meta.job != j &&
776 !job_type_is_superset(j->type, j->unit->meta.job->type))
783 static void transaction_minimize_impact(Manager *m) {
787 /* Drops all unnecessary jobs that reverse already active jobs
788 * or that stop a running service. */
796 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
797 LIST_FOREACH(transaction, j, j) {
798 bool stops_running_service, changes_existing_job;
800 /* If it matters, we shouldn't drop it */
801 if (j->matters_to_anchor)
804 /* Would this stop a running service?
805 * Would this change an existing job?
806 * If so, let's drop this entry */
808 stops_running_service =
809 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
811 changes_existing_job =
812 j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
814 if (!stops_running_service && !changes_existing_job)
817 if (stops_running_service)
818 log_debug("%s/%s would stop a running service.", unit_id(j->unit), job_type_to_string(j->type));
820 if (changes_existing_job)
821 log_debug("%s/%s would change existing job.", unit_id(j->unit), job_type_to_string(j->type));
823 /* Ok, let's get rid of this */
824 log_debug("Deleting %s/%s to minimize impact.", unit_id(j->unit), job_type_to_string(j->type));
826 transaction_delete_job(m, j);
838 static int transaction_apply(Manager *m, JobMode mode) {
843 /* Moves the transaction jobs to the set of active jobs */
845 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
847 assert(!j->transaction_prev);
848 assert(!j->transaction_next);
853 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
857 while ((j = hashmap_steal_first(m->transaction_jobs))) {
861 if (j->unit->meta.job)
862 job_free(j->unit->meta.job);
864 j->unit->meta.job = j;
867 /* We're fully installed. Now let's free data we don't
870 assert(!j->transaction_next);
871 assert(!j->transaction_prev);
873 job_add_to_run_queue(j);
874 job_add_to_dbus_queue(j);
877 /* As last step, kill all remaining job dependencies. */
878 transaction_clean_dependencies(m);
884 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
888 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
894 static int transaction_activate(Manager *m, JobMode mode) {
896 unsigned generation = 1;
900 /* This applies the changes recorded in transaction_jobs to
901 * the actual list of jobs, if possible. */
903 /* First step: figure out which jobs matter */
904 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
906 /* Second step: Try not to stop any running services if
907 * we don't have to. Don't try to reverse running
908 * jobs if we don't have to. */
909 transaction_minimize_impact(m);
912 /* Third step: Let's remove unneeded jobs that might
914 transaction_collect_garbage(m);
916 /* Fourth step: verify order makes sense and correct
917 * cycles if necessary and possible */
918 if ((r = transaction_verify_order(m, &generation)) >= 0)
922 log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
926 /* Let's see if the resulting transaction ordering
927 * graph is still cyclic... */
931 /* Fifth step: let's drop unmergeable entries if
932 * necessary and possible, merge entries we can
934 if ((r = transaction_merge_jobs(m)) >= 0)
938 log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
942 /* Sixth step: an entry got dropped, let's garbage
943 * collect its dependencies. */
944 transaction_collect_garbage(m);
946 /* Let's see if the resulting transaction still has
947 * unmergeable entries ... */
950 /* Seventh step: check whether we can actually apply this */
951 if (mode == JOB_FAIL)
952 if ((r = transaction_is_destructive(m, mode)) < 0) {
953 log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
957 /* Eights step: apply changes */
958 if ((r = transaction_apply(m, mode)) < 0) {
959 log_debug("Failed to apply transaction: %s", strerror(-r));
963 assert(hashmap_isempty(m->transaction_jobs));
964 assert(!m->transaction_anchor);
969 transaction_abort(m);
973 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool force, bool *is_new) {
980 /* Looks for an axisting prospective job and returns that. If
981 * it doesn't exist it is created and added to the prospective
984 f = hashmap_get(m->transaction_jobs, unit);
986 LIST_FOREACH(transaction, j, f) {
987 assert(j->unit == unit);
989 if (j->type == type) {
996 if (unit->meta.job && unit->meta.job->type == type)
998 else if (!(j = job_new(m, type, unit)))
1003 j->matters_to_anchor = false;
1006 LIST_PREPEND(Job, transaction, f, j);
1008 if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1019 void manager_transaction_unlink_job(Manager *m, Job *j) {
1023 if (j->transaction_prev)
1024 j->transaction_prev->transaction_next = j->transaction_next;
1025 else if (j->transaction_next)
1026 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1028 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1030 if (j->transaction_next)
1031 j->transaction_next->transaction_prev = j->transaction_prev;
1033 j->transaction_prev = j->transaction_next = NULL;
1035 while (j->subject_list)
1036 job_dependency_free(j->subject_list);
1038 while (j->object_list) {
1039 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1041 job_dependency_free(j->object_list);
1044 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1045 unit_id(other->unit), job_type_to_string(other->type),
1046 unit_id(j->unit), job_type_to_string(j->type));
1047 transaction_delete_job(m, other);
1052 static int transaction_add_job_and_dependencies(Manager *m, JobType type, Unit *unit, Job *by, bool matters, bool force, Job **_ret) {
1060 assert(type < _JOB_TYPE_MAX);
1063 if (unit->meta.load_state != UNIT_LOADED)
1066 if (!unit_job_is_applicable(unit, type))
1069 /* First add the job. */
1070 if (!(ret = transaction_add_one_job(m, type, unit, force, &is_new)))
1073 /* Then, add a link to the job. */
1074 if (!job_dependency_new(by, ret, matters))
1078 /* Finally, recursively add in all dependencies. */
1079 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1080 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1081 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
1083 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUIRES], i)
1084 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !force, force, NULL)) < 0 && r != -EBADR)
1086 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1087 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, force, NULL)) < 0 && r != -EBADR)
1089 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1090 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
1092 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUISITE], i)
1093 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !force, force, NULL)) < 0 && r != -EBADR)
1095 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1096 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
1099 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1101 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1102 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
1106 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1118 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret) {
1123 assert(type < _JOB_TYPE_MAX);
1125 assert(mode < _JOB_MODE_MAX);
1127 log_debug("Trying to enqueue job %s/%s", unit_id(unit), job_type_to_string(type));
1129 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, force, &ret)) < 0) {
1130 transaction_abort(m);
1134 if ((r = transaction_activate(m, mode)) < 0)
1137 log_debug("Enqueued job %s/%s as %u", unit_id(unit), job_type_to_string(type), (unsigned) ret->id);
1145 Job *manager_get_job(Manager *m, uint32_t id) {
1148 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1151 Unit *manager_get_unit(Manager *m, const char *name) {
1155 return hashmap_get(m->units, name);
1158 unsigned manager_dispatch_load_queue(Manager *m) {
1164 /* Make sure we are not run recursively */
1165 if (m->dispatching_load_queue)
1168 m->dispatching_load_queue = true;
1170 /* Dispatches the load queue. Takes a unit from the queue and
1171 * tries to load its data until the queue is empty */
1173 while ((meta = m->load_queue)) {
1174 assert(meta->in_load_queue);
1176 unit_load(UNIT(meta));
1180 m->dispatching_load_queue = false;
1184 int manager_load_unit(Manager *m, const char *path, Unit **_ret) {
1193 /* This will load the service information files, but not actually
1194 * start any services or anything. */
1196 name = file_name_from_path(path);
1198 if ((ret = manager_get_unit(m, name))) {
1203 if (!(ret = unit_new(m)))
1206 if (is_path(path)) {
1207 if (!(ret->meta.fragment_path = strdup(path))) {
1213 if ((r = unit_add_name(ret, name)) < 0) {
1218 unit_add_to_load_queue(ret);
1219 unit_add_to_dbus_queue(ret);
1221 manager_dispatch_load_queue(m);
1227 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1234 HASHMAP_FOREACH(j, s->jobs, i)
1235 job_dump(j, f, prefix);
1238 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1246 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1247 if (unit_id(u) == t)
1248 unit_dump(u, f, prefix);
1251 void manager_clear_jobs(Manager *m) {
1256 transaction_abort(m);
1258 while ((j = hashmap_first(m->jobs)))
1262 unsigned manager_dispatch_run_queue(Manager *m) {
1266 if (m->dispatching_run_queue)
1269 m->dispatching_run_queue = true;
1271 while ((j = m->run_queue)) {
1272 assert(j->installed);
1273 assert(j->in_run_queue);
1275 job_run_and_invalidate(j);
1279 m->dispatching_run_queue = false;
1283 unsigned manager_dispatch_dbus_queue(Manager *m) {
1290 if (m->dispatching_dbus_queue)
1293 m->dispatching_dbus_queue = true;
1295 while ((meta = m->dbus_unit_queue)) {
1296 Unit *u = (Unit*) meta;
1297 assert(u->meta.in_dbus_queue);
1299 bus_unit_send_change_signal(u);
1303 while ((j = m->dbus_job_queue)) {
1304 assert(j->in_dbus_queue);
1306 bus_job_send_change_signal(j);
1310 m->dispatching_dbus_queue = false;
1314 static int manager_dispatch_sigchld(Manager *m) {
1317 log_debug("dispatching SIGCHLD");
1324 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG) < 0) {
1326 if (errno == ECHILD)
1335 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1338 log_debug("child %llu died (code=%s, status=%i)", (long long unsigned) si.si_pid, sigchld_code_to_string(si.si_code), si.si_status);
1340 if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
1343 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1349 static int manager_process_signal_fd(Manager *m, bool *quit) {
1351 struct signalfd_siginfo sfsi;
1352 bool sigchld = false;
1357 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1362 if (errno == EAGAIN)
1368 switch (sfsi.ssi_signo) {
1377 if (m->running_as != MANAGER_INIT) {
1385 if ((r = manager_load_unit(m, SPECIAL_CTRL_ALT_DEL_TARGET, &target)) < 0)
1386 log_error("Failed to load ctrl-alt-del target: %s", strerror(-r));
1387 else if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, true, NULL)) < 0)
1388 log_error("Failed to enqueue ctrl-alt-del job: %s", strerror(-r));
1395 if (m->running_as == MANAGER_INIT) {
1399 if ((r = manager_load_unit(m, SPECIAL_KBREQUEST_TARGET, &target)) < 0)
1400 log_error("Failed to load kbrequest target: %s", strerror(-r));
1401 else if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, true, NULL)) < 0)
1402 log_error("Failed to enqueue kbrequest job: %s", strerror(-r));
1407 /* This is a nop on non-init systemd's */
1412 log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
1417 return manager_dispatch_sigchld(m);
1422 static int process_event(Manager *m, struct epoll_event *ev, bool *quit) {
1429 assert(w = ev->data.ptr);
1435 /* An incoming signal? */
1436 if (ev->events != EPOLLIN)
1439 if ((r = manager_process_signal_fd(m, quit)) < 0)
1446 /* Some fd event, to be dispatched to the units */
1447 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1454 /* Some timer event, to be dispatched to the units */
1455 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1457 if (k < 0 && (errno == EINTR || errno == EAGAIN))
1460 return k < 0 ? -errno : -EIO;
1463 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1468 /* Some mount table change, intended for the mount subsystem */
1469 mount_fd_event(m, ev->events);
1473 /* Some notification from udev, intended for the device subsystem */
1474 device_fd_event(m, ev->events);
1477 case WATCH_DBUS_WATCH:
1478 bus_watch_event(m, w, ev->events);
1481 case WATCH_DBUS_TIMEOUT:
1482 bus_timeout_event(m, w, ev->events);
1486 assert_not_reached("Unknown epoll event type.");
1492 int manager_loop(Manager *m) {
1496 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
1501 struct epoll_event event;
1504 if (!ratelimit_test(&rl)) {
1505 /* Yay, something is going seriously wrong, pause a little */
1506 log_warning("Looping too fast. Throttling execution a little.");
1510 if (manager_dispatch_load_queue(m) > 0)
1513 if (manager_dispatch_run_queue(m) > 0)
1516 if (bus_dispatch(m) > 0)
1519 if (manager_dispatch_dbus_queue(m) > 0)
1522 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
1524 if (errno == -EINTR)
1532 if ((r = process_event(m, &event, &quit)) < 0)
1540 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
1548 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
1551 if (!(n = bus_path_unescape(s+31)))
1554 u = manager_get_unit(m, n);
1565 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
1574 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
1577 if ((r = safe_atou(s + 30, &id)) < 0)
1580 if (!(j = manager_get_job(m, id)))
1588 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
1589 [MANAGER_INIT] = "init",
1590 [MANAGER_SYSTEM] = "system",
1591 [MANAGER_SESSION] = "session"
1594 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);