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>
38 #include <sys/types.h>
47 #include "ratelimit.h"
49 #include "mount-setup.h"
50 #include "utmp-wtmp.h"
51 #include "unit-name.h"
52 #include "dbus-unit.h"
55 #include "path-lookup.h"
58 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
59 #define GC_QUEUE_ENTRIES_MAX 16
61 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
62 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
64 /* Where clients shall send notification messages to */
65 #define NOTIFY_SOCKET "/org/freedesktop/systemd1/notify"
67 static int manager_setup_notify(Manager *m) {
70 struct sockaddr_un un;
72 struct epoll_event ev;
77 m->notify_watch.type = WATCH_NOTIFY;
78 if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
79 log_error("Failed to allocate notification socket: %m");
84 sa.sa.sa_family = AF_UNIX;
86 if (m->running_as == MANAGER_SESSION)
87 snprintf(sa.un.sun_path+1, sizeof(sa.un.sun_path)-1, NOTIFY_SOCKET "/%llu", random_ull());
89 strncpy(sa.un.sun_path+1, NOTIFY_SOCKET, sizeof(sa.un.sun_path)-1);
91 if (bind(m->notify_watch.fd, &sa.sa, sizeof(sa)) < 0) {
92 log_error("bind() failed: %m");
96 if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
97 log_error("SO_PASSCRED failed: %m");
103 ev.data.ptr = &m->notify_watch;
105 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
108 if (!(m->notify_socket = strdup(sa.un.sun_path+1)))
114 static int enable_special_signals(Manager *m) {
119 /* Enable that we get SIGINT on control-alt-del */
120 if (reboot(RB_DISABLE_CAD) < 0)
121 log_warning("Failed to enable ctrl-alt-del handling: %m");
123 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
124 log_warning("Failed to open /dev/tty0: %m");
126 /* Enable that we get SIGWINCH on kbrequest */
127 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
128 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
130 close_nointr_nofail(fd);
136 static int manager_setup_signals(Manager *m) {
138 struct epoll_event ev;
143 /* We are not interested in SIGSTOP and friends. */
145 sa.sa_handler = SIG_DFL;
146 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
147 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
149 assert_se(sigemptyset(&mask) == 0);
151 sigset_add_many(&mask,
152 SIGCHLD, /* Child died */
153 SIGTERM, /* Reexecute daemon */
154 SIGHUP, /* Reload configuration */
155 SIGUSR1, /* systemd/upstart: reconnect to D-Bus */
156 SIGUSR2, /* systemd: dump status */
157 SIGINT, /* Kernel sends us this on control-alt-del */
158 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
159 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
160 SIGRTMIN+0, /* systemd: start default.target */
161 SIGRTMIN+1, /* systemd: start rescue.target */
162 SIGRTMIN+2, /* systemd: isolate emergency.target */
163 SIGRTMIN+3, /* systemd: start halt.target */
164 SIGRTMIN+4, /* systemd: start poweroff.target */
165 SIGRTMIN+5, /* systemd: start reboot.target */
167 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
169 m->signal_watch.type = WATCH_SIGNAL;
170 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
175 ev.data.ptr = &m->signal_watch;
177 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
180 if (m->running_as == MANAGER_INIT)
181 return enable_special_signals(m);
186 int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **_m) {
192 assert(running_as >= 0);
193 assert(running_as < _MANAGER_RUNNING_AS_MAX);
195 if (!(m = new0(Manager, 1)))
198 timestamp_get(&m->startup_timestamp);
200 m->running_as = running_as;
201 m->confirm_spawn = confirm_spawn;
202 m->name_data_slot = -1;
203 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
204 m->pin_cgroupfs_fd = -1;
206 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = -1;
207 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
209 if (!(m->environment = strv_copy(environ)))
212 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
215 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
218 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
221 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
224 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
227 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
230 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
233 if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
236 if ((r = manager_setup_signals(m)) < 0)
239 if ((r = manager_setup_cgroup(m)) < 0)
242 if ((r = manager_setup_notify(m)) < 0)
245 /* Try to connect to the busses, if possible. */
246 if ((r = bus_init_system(m)) < 0 ||
247 (r = bus_init_api(m)) < 0)
250 if (asprintf(&p, "%s/%s", m->cgroup_mount_point, m->cgroup_hierarchy) < 0) {
255 m->pin_cgroupfs_fd = open(p, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
266 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
272 while ((meta = m->cleanup_queue)) {
273 assert(meta->in_cleanup_queue);
275 unit_free(UNIT(meta));
283 GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */
284 GC_OFFSET_UNSURE, /* No clue */
285 GC_OFFSET_GOOD, /* We still need this unit */
286 GC_OFFSET_BAD, /* We don't need this unit anymore */
290 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
297 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
298 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
299 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
302 if (u->meta.in_cleanup_queue)
305 if (unit_check_gc(u))
308 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
312 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
313 unit_gc_sweep(other, gc_marker);
315 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
318 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
325 /* We were unable to find anything out about this entry, so
326 * let's investigate it later */
327 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
328 unit_add_to_gc_queue(u);
332 /* We definitely know that this one is not useful anymore, so
333 * let's mark it for deletion */
334 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
335 unit_add_to_cleanup_queue(u);
339 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
342 static unsigned manager_dispatch_gc_queue(Manager *m) {
349 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
350 (m->gc_queue_timestamp <= 0 ||
351 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
354 log_debug("Running GC...");
356 m->gc_marker += _GC_OFFSET_MAX;
357 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
360 gc_marker = m->gc_marker;
362 while ((meta = m->gc_queue)) {
363 assert(meta->in_gc_queue);
365 unit_gc_sweep(UNIT(meta), gc_marker);
367 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
368 meta->in_gc_queue = false;
372 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
373 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
374 log_debug("Collecting %s", meta->id);
375 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
376 unit_add_to_cleanup_queue(UNIT(meta));
380 m->n_in_gc_queue = 0;
381 m->gc_queue_timestamp = 0;
386 static void manager_clear_jobs_and_units(Manager *m) {
392 while ((j = hashmap_first(m->transaction_jobs)))
395 while ((u = hashmap_first(m->units)))
398 manager_dispatch_cleanup_queue(m);
400 assert(!m->load_queue);
401 assert(!m->run_queue);
402 assert(!m->dbus_unit_queue);
403 assert(!m->dbus_job_queue);
404 assert(!m->cleanup_queue);
405 assert(!m->gc_queue);
407 assert(hashmap_isempty(m->transaction_jobs));
408 assert(hashmap_isempty(m->jobs));
409 assert(hashmap_isempty(m->units));
412 void manager_free(Manager *m) {
417 manager_clear_jobs_and_units(m);
419 for (c = 0; c < _UNIT_TYPE_MAX; c++)
420 if (unit_vtable[c]->shutdown)
421 unit_vtable[c]->shutdown(m);
423 /* If we reexecute ourselves, we keep the root cgroup
425 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
430 hashmap_free(m->units);
431 hashmap_free(m->jobs);
432 hashmap_free(m->transaction_jobs);
433 hashmap_free(m->watch_pids);
434 hashmap_free(m->watch_bus);
436 if (m->epoll_fd >= 0)
437 close_nointr_nofail(m->epoll_fd);
438 if (m->signal_watch.fd >= 0)
439 close_nointr_nofail(m->signal_watch.fd);
440 if (m->notify_watch.fd >= 0)
441 close_nointr_nofail(m->notify_watch.fd);
443 free(m->notify_socket);
445 lookup_paths_free(&m->lookup_paths);
446 strv_free(m->environment);
448 free(m->cgroup_controller);
449 free(m->cgroup_hierarchy);
450 free(m->cgroup_mount_point);
452 hashmap_free(m->cgroup_bondings);
454 if (m->pin_cgroupfs_fd >= 0)
455 close_nointr_nofail(m->pin_cgroupfs_fd);
460 int manager_enumerate(Manager *m) {
466 /* Let's ask every type to load all units from disk/kernel
467 * that it might know */
468 for (c = 0; c < _UNIT_TYPE_MAX; c++)
469 if (unit_vtable[c]->enumerate)
470 if ((q = unit_vtable[c]->enumerate(m)) < 0)
473 manager_dispatch_load_queue(m);
477 int manager_coldplug(Manager *m) {
485 /* Then, let's set up their initial state. */
486 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
492 if ((q = unit_coldplug(u)) < 0)
499 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
504 /* First, enumerate what we can from all config files */
505 r = manager_enumerate(m);
507 /* Second, deserialize if there is something to deserialize */
509 if ((q = manager_deserialize(m, serialization, fds)) < 0)
512 /* Third, fire things up! */
513 if ((q = manager_coldplug(m)) < 0)
516 /* Now that the initial devices are available, let's see if we
517 * can write the utmp file */
518 manager_write_utmp_reboot(m);
523 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
527 /* Deletes one job from the transaction */
529 manager_transaction_unlink_job(m, j, delete_dependencies);
535 static void transaction_delete_unit(Manager *m, Unit *u) {
538 /* Deletes all jobs associated with a certain unit from the
541 while ((j = hashmap_get(m->transaction_jobs, u)))
542 transaction_delete_job(m, j, true);
545 static void transaction_clean_dependencies(Manager *m) {
551 /* Drops all dependencies of all installed jobs */
553 HASHMAP_FOREACH(j, m->jobs, i) {
554 while (j->subject_list)
555 job_dependency_free(j->subject_list);
556 while (j->object_list)
557 job_dependency_free(j->object_list);
560 assert(!m->transaction_anchor);
563 static void transaction_abort(Manager *m) {
568 while ((j = hashmap_first(m->transaction_jobs)))
570 transaction_delete_job(m, j, true);
574 assert(hashmap_isempty(m->transaction_jobs));
576 transaction_clean_dependencies(m);
579 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
584 /* A recursive sweep through the graph that marks all units
585 * that matter to the anchor job, i.e. are directly or
586 * indirectly a dependency of the anchor job via paths that
587 * are fully marked as mattering. */
592 l = m->transaction_anchor;
594 LIST_FOREACH(subject, l, l) {
596 /* This link does not matter */
600 /* This unit has already been marked */
601 if (l->object->generation == generation)
604 l->object->matters_to_anchor = true;
605 l->object->generation = generation;
607 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
611 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
612 JobDependency *l, *last;
616 assert(j->unit == other->unit);
617 assert(!j->installed);
619 /* Merges 'other' into 'j' and then deletes j. */
622 j->state = JOB_WAITING;
623 j->override = j->override || other->override;
625 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
627 /* Patch us in as new owner of the JobDependency objects */
629 LIST_FOREACH(subject, l, other->subject_list) {
630 assert(l->subject == other);
635 /* Merge both lists */
637 last->subject_next = j->subject_list;
639 j->subject_list->subject_prev = last;
640 j->subject_list = other->subject_list;
643 /* Patch us in as new owner of the JobDependency objects */
645 LIST_FOREACH(object, l, other->object_list) {
646 assert(l->object == other);
651 /* Merge both lists */
653 last->object_next = j->object_list;
655 j->object_list->object_prev = last;
656 j->object_list = other->object_list;
659 /* Kill the other job */
660 other->subject_list = NULL;
661 other->object_list = NULL;
662 transaction_delete_job(m, other, true);
665 static int delete_one_unmergeable_job(Manager *m, Job *j) {
670 /* Tries to delete one item in the linked list
671 * j->transaction_next->transaction_next->... that conflicts
672 * whith another one, in an attempt to make an inconsistent
673 * transaction work. */
675 /* We rely here on the fact that if a merged with b does not
676 * merge with c, either a or b merge with c neither */
677 LIST_FOREACH(transaction, j, j)
678 LIST_FOREACH(transaction, k, j->transaction_next) {
681 /* Is this one mergeable? Then skip it */
682 if (job_type_is_mergeable(j->type, k->type))
685 /* Ok, we found two that conflict, let's see if we can
686 * drop one of them */
687 if (!j->matters_to_anchor)
689 else if (!k->matters_to_anchor)
694 /* Ok, we can drop one, so let's do so. */
695 log_debug("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
696 transaction_delete_job(m, d, true);
703 static int transaction_merge_jobs(Manager *m) {
710 /* First step, check whether any of the jobs for one specific
711 * task conflict. If so, try to drop one of them. */
712 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
717 LIST_FOREACH(transaction, k, j->transaction_next) {
718 if ((r = job_type_merge(&t, k->type)) >= 0)
721 /* OK, we could not merge all jobs for this
722 * action. Let's see if we can get rid of one
725 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
726 /* Ok, we managed to drop one, now
727 * let's ask our callers to call us
728 * again after garbage collecting */
731 /* We couldn't merge anything. Failure */
736 /* Second step, merge the jobs. */
737 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
741 /* Merge all transactions */
742 LIST_FOREACH(transaction, k, j->transaction_next)
743 assert_se(job_type_merge(&t, k->type) == 0);
745 /* If an active job is mergeable, merge it too */
746 if (j->unit->meta.job)
747 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
749 while ((k = j->transaction_next)) {
751 transaction_merge_and_delete_job(m, k, j, t);
754 transaction_merge_and_delete_job(m, j, k, t);
757 assert(!j->transaction_next);
758 assert(!j->transaction_prev);
764 static void transaction_drop_redundant(Manager *m) {
769 /* Goes through the transaction and removes all jobs that are
778 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
779 bool changes_something = false;
782 LIST_FOREACH(transaction, k, j) {
784 if (!job_is_anchor(k) &&
785 job_type_is_redundant(k->type, unit_active_state(k->unit)))
788 changes_something = true;
792 if (changes_something)
795 log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
796 transaction_delete_job(m, j, false);
804 static bool unit_matters_to_anchor(Unit *u, Job *j) {
806 assert(!j->transaction_prev);
808 /* Checks whether at least one of the jobs for this unit
809 * matters to the anchor. */
811 LIST_FOREACH(transaction, j, j)
812 if (j->matters_to_anchor)
818 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
825 assert(!j->transaction_prev);
827 /* Does a recursive sweep through the ordering graph, looking
828 * for a cycle. If we find cycle we try to break it. */
830 /* Have we seen this before? */
831 if (j->generation == generation) {
834 /* If the marker is NULL we have been here already and
835 * decided the job was loop-free from here. Hence
836 * shortcut things and return right-away. */
840 /* So, the marker is not NULL and we already have been
841 * here. We have a cycle. Let's try to break it. We go
842 * backwards in our path and try to find a suitable
843 * job to remove. We use the marker to find our way
844 * back, since smart how we are we stored our way back
846 log_debug("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
848 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
850 log_debug("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
853 !unit_matters_to_anchor(k->unit, k)) {
854 /* Ok, we can drop this one, so let's
856 log_debug("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
857 transaction_delete_unit(m, k->unit);
861 /* Check if this in fact was the beginning of
867 log_debug("Unable to break cycle");
872 /* Make the marker point to where we come from, so that we can
873 * find our way backwards if we want to break a cycle. We use
874 * a special marker for the beginning: we point to
876 j->marker = from ? from : j;
877 j->generation = generation;
879 /* We assume that the the dependencies are bidirectional, and
880 * hence can ignore UNIT_AFTER */
881 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
884 /* Is there a job for this unit? */
885 if (!(o = hashmap_get(m->transaction_jobs, u)))
887 /* Ok, there is no job for this in the
888 * transaction, but maybe there is already one
890 if (!(o = u->meta.job))
893 if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
897 /* Ok, let's backtrack, and remember that this entry is not on
898 * our path anymore. */
904 static int transaction_verify_order(Manager *m, unsigned *generation) {
913 /* Check if the ordering graph is cyclic. If it is, try to fix
914 * that up by dropping one of the jobs. */
918 HASHMAP_FOREACH(j, m->transaction_jobs, i)
919 if ((r = transaction_verify_order_one(m, j, NULL, g)) < 0)
925 static void transaction_collect_garbage(Manager *m) {
930 /* Drop jobs that are not required by any other job */
938 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
942 log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
943 transaction_delete_job(m, j, true);
951 static int transaction_is_destructive(Manager *m) {
957 /* Checks whether applying this transaction means that
958 * existing jobs would be replaced */
960 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
963 assert(!j->transaction_prev);
964 assert(!j->transaction_next);
966 if (j->unit->meta.job &&
967 j->unit->meta.job != j &&
968 !job_type_is_superset(j->type, j->unit->meta.job->type))
975 static void transaction_minimize_impact(Manager *m) {
979 /* Drops all unnecessary jobs that reverse already active jobs
980 * or that stop a running service. */
988 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
989 LIST_FOREACH(transaction, j, j) {
990 bool stops_running_service, changes_existing_job;
992 /* If it matters, we shouldn't drop it */
993 if (j->matters_to_anchor)
996 /* Would this stop a running service?
997 * Would this change an existing job?
998 * If so, let's drop this entry */
1000 stops_running_service =
1001 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1003 changes_existing_job =
1004 j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
1006 if (!stops_running_service && !changes_existing_job)
1009 if (stops_running_service)
1010 log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1012 if (changes_existing_job)
1013 log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1015 /* Ok, let's get rid of this */
1016 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1018 transaction_delete_job(m, j, true);
1030 static int transaction_apply(Manager *m) {
1035 /* Moves the transaction jobs to the set of active jobs */
1037 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1039 assert(!j->transaction_prev);
1040 assert(!j->transaction_next);
1045 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1049 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1053 if (j->unit->meta.job)
1054 job_free(j->unit->meta.job);
1056 j->unit->meta.job = j;
1057 j->installed = true;
1059 /* We're fully installed. Now let's free data we don't
1062 assert(!j->transaction_next);
1063 assert(!j->transaction_prev);
1065 job_add_to_run_queue(j);
1066 job_add_to_dbus_queue(j);
1069 /* As last step, kill all remaining job dependencies. */
1070 transaction_clean_dependencies(m);
1076 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1080 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1086 static int transaction_activate(Manager *m, JobMode mode) {
1088 unsigned generation = 1;
1092 /* This applies the changes recorded in transaction_jobs to
1093 * the actual list of jobs, if possible. */
1095 /* First step: figure out which jobs matter */
1096 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1098 /* Second step: Try not to stop any running services if
1099 * we don't have to. Don't try to reverse running
1100 * jobs if we don't have to. */
1101 transaction_minimize_impact(m);
1103 /* Third step: Drop redundant jobs */
1104 transaction_drop_redundant(m);
1107 /* Fourth step: Let's remove unneeded jobs that might
1109 transaction_collect_garbage(m);
1111 /* Fifth step: verify order makes sense and correct
1112 * cycles if necessary and possible */
1113 if ((r = transaction_verify_order(m, &generation)) >= 0)
1117 log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
1121 /* Let's see if the resulting transaction ordering
1122 * graph is still cyclic... */
1126 /* Sixth step: let's drop unmergeable entries if
1127 * necessary and possible, merge entries we can
1129 if ((r = transaction_merge_jobs(m)) >= 0)
1133 log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
1137 /* Seventh step: an entry got dropped, let's garbage
1138 * collect its dependencies. */
1139 transaction_collect_garbage(m);
1141 /* Let's see if the resulting transaction still has
1142 * unmergeable entries ... */
1145 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1146 transaction_drop_redundant(m);
1148 /* Ninth step: check whether we can actually apply this */
1149 if (mode == JOB_FAIL)
1150 if ((r = transaction_is_destructive(m)) < 0) {
1151 log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
1155 /* Tenth step: apply changes */
1156 if ((r = transaction_apply(m)) < 0) {
1157 log_debug("Failed to apply transaction: %s", strerror(-r));
1161 assert(hashmap_isempty(m->transaction_jobs));
1162 assert(!m->transaction_anchor);
1167 transaction_abort(m);
1171 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1178 /* Looks for an axisting prospective job and returns that. If
1179 * it doesn't exist it is created and added to the prospective
1182 f = hashmap_get(m->transaction_jobs, unit);
1184 LIST_FOREACH(transaction, j, f) {
1185 assert(j->unit == unit);
1187 if (j->type == type) {
1194 if (unit->meta.job && unit->meta.job->type == type)
1196 else if (!(j = job_new(m, type, unit)))
1201 j->matters_to_anchor = false;
1202 j->override = override;
1204 LIST_PREPEND(Job, transaction, f, j);
1206 if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1214 log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1219 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1223 if (j->transaction_prev)
1224 j->transaction_prev->transaction_next = j->transaction_next;
1225 else if (j->transaction_next)
1226 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1228 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1230 if (j->transaction_next)
1231 j->transaction_next->transaction_prev = j->transaction_prev;
1233 j->transaction_prev = j->transaction_next = NULL;
1235 while (j->subject_list)
1236 job_dependency_free(j->subject_list);
1238 while (j->object_list) {
1239 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1241 job_dependency_free(j->object_list);
1243 if (other && delete_dependencies) {
1244 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1245 other->unit->meta.id, job_type_to_string(other->type),
1246 j->unit->meta.id, job_type_to_string(j->type));
1247 transaction_delete_job(m, other, delete_dependencies);
1252 static int transaction_add_job_and_dependencies(
1267 assert(type < _JOB_TYPE_MAX);
1270 if (unit->meta.load_state != UNIT_LOADED)
1273 if (!unit_job_is_applicable(unit, type))
1276 /* First add the job. */
1277 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1280 /* Then, add a link to the job. */
1281 if (!job_dependency_new(by, ret, matters))
1285 /* Finally, recursively add in all dependencies. */
1286 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1287 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1288 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1291 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1292 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1293 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1295 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1296 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0)
1297 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1299 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1300 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1303 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1304 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1305 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1307 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1308 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1311 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1313 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1314 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1318 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1330 static int transaction_add_isolate_jobs(Manager *m) {
1338 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1340 /* ignore aliases */
1341 if (u->meta.id != k)
1344 if (UNIT_VTABLE(u)->no_isolate)
1347 /* No need to stop inactive jobs */
1348 if (unit_active_state(u) == UNIT_INACTIVE)
1351 /* Is there already something listed for this? */
1352 if (hashmap_get(m->transaction_jobs, u))
1355 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL)) < 0)
1356 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1362 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) {
1367 assert(type < _JOB_TYPE_MAX);
1369 assert(mode < _JOB_MODE_MAX);
1371 if (mode == JOB_ISOLATE && type != JOB_START)
1374 log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
1376 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) {
1377 transaction_abort(m);
1381 if (mode == JOB_ISOLATE)
1382 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1383 transaction_abort(m);
1387 if ((r = transaction_activate(m, mode)) < 0)
1390 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1398 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, Job **_ret) {
1403 assert(type < _JOB_TYPE_MAX);
1405 assert(mode < _JOB_MODE_MAX);
1407 if ((r = manager_load_unit(m, name, NULL, &unit)) < 0)
1410 return manager_add_job(m, type, unit, mode, override, _ret);
1413 Job *manager_get_job(Manager *m, uint32_t id) {
1416 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1419 Unit *manager_get_unit(Manager *m, const char *name) {
1423 return hashmap_get(m->units, name);
1426 unsigned manager_dispatch_load_queue(Manager *m) {
1432 /* Make sure we are not run recursively */
1433 if (m->dispatching_load_queue)
1436 m->dispatching_load_queue = true;
1438 /* Dispatches the load queue. Takes a unit from the queue and
1439 * tries to load its data until the queue is empty */
1441 while ((meta = m->load_queue)) {
1442 assert(meta->in_load_queue);
1444 unit_load(UNIT(meta));
1448 m->dispatching_load_queue = false;
1452 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) {
1457 assert(name || path);
1459 /* This will prepare the unit for loading, but not actually
1460 * load anything from disk. */
1462 if (path && !is_path(path))
1466 name = file_name_from_path(path);
1468 if (!unit_name_is_valid(name))
1471 if ((ret = manager_get_unit(m, name))) {
1476 if (!(ret = unit_new(m)))
1480 if (!(ret->meta.fragment_path = strdup(path))) {
1485 if ((r = unit_add_name(ret, name)) < 0) {
1490 unit_add_to_load_queue(ret);
1491 unit_add_to_dbus_queue(ret);
1492 unit_add_to_gc_queue(ret);
1500 int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) {
1505 /* This will load the service information files, but not actually
1506 * start any services or anything. */
1508 if ((r = manager_load_unit_prepare(m, name, path, _ret)) != 0)
1511 manager_dispatch_load_queue(m);
1514 *_ret = unit_follow_merge(*_ret);
1519 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1526 HASHMAP_FOREACH(j, s->jobs, i)
1527 job_dump(j, f, prefix);
1530 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1538 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1539 if (u->meta.id == t)
1540 unit_dump(u, f, prefix);
1543 void manager_clear_jobs(Manager *m) {
1548 transaction_abort(m);
1550 while ((j = hashmap_first(m->jobs)))
1554 unsigned manager_dispatch_run_queue(Manager *m) {
1558 if (m->dispatching_run_queue)
1561 m->dispatching_run_queue = true;
1563 while ((j = m->run_queue)) {
1564 assert(j->installed);
1565 assert(j->in_run_queue);
1567 job_run_and_invalidate(j);
1571 m->dispatching_run_queue = false;
1575 unsigned manager_dispatch_dbus_queue(Manager *m) {
1582 if (m->dispatching_dbus_queue)
1585 m->dispatching_dbus_queue = true;
1587 while ((meta = m->dbus_unit_queue)) {
1588 assert(meta->in_dbus_queue);
1590 bus_unit_send_change_signal(UNIT(meta));
1594 while ((j = m->dbus_job_queue)) {
1595 assert(j->in_dbus_queue);
1597 bus_job_send_change_signal(j);
1601 m->dispatching_dbus_queue = false;
1605 static int manager_process_notify_fd(Manager *m) {
1612 struct msghdr msghdr;
1614 struct ucred *ucred;
1616 struct cmsghdr cmsghdr;
1617 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1623 iovec.iov_base = buf;
1624 iovec.iov_len = sizeof(buf)-1;
1628 msghdr.msg_iov = &iovec;
1629 msghdr.msg_iovlen = 1;
1630 msghdr.msg_control = &control;
1631 msghdr.msg_controllen = sizeof(control);
1633 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1637 if (errno == EAGAIN)
1643 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1644 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1645 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1646 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1647 log_warning("Received notify message without credentials. Ignoring.");
1651 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1653 if (!(u = hashmap_get(m->watch_pids, UINT32_TO_PTR(ucred->pid))))
1654 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1655 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1660 if (!(tags = strv_split(buf, "\n\r")))
1663 log_debug("Got notification message for unit %s", u->meta.id);
1665 if (UNIT_VTABLE(u)->notify_message)
1666 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1674 static int manager_dispatch_sigchld(Manager *m) {
1684 /* First we call waitd() for a PID and do not reap the
1685 * zombie. That way we can still access /proc/$PID for
1686 * it while it is a zombie. */
1687 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1689 if (errno == ECHILD)
1701 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1704 get_process_name(si.si_pid, &name);
1705 log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si.si_pid, strna(name));
1709 /* Let's flush any message the dying child might still
1710 * have queued for us. This ensures that the process
1711 * still exists in /proc so that we can figure out
1712 * which cgroup and hence unit it belongs to. */
1713 if ((r = manager_process_notify_fd(m)) < 0)
1716 /* And now figure out the unit this belongs to */
1717 if (!(u = hashmap_get(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
1718 u = cgroup_unit_by_pid(m, si.si_pid);
1720 /* And now, we actually reap the zombie. */
1721 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1728 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1731 log_debug("Child %llu died (code=%s, status=%i/%s)",
1732 (long long unsigned) si.si_pid,
1733 sigchld_code_to_string(si.si_code),
1735 strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
1740 log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
1742 hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid));
1743 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1749 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
1752 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, NULL)) < 0)
1753 log_error("Failed to enqueue %s job: %s", name, strerror(-r));
1758 static int manager_process_signal_fd(Manager *m) {
1760 struct signalfd_siginfo sfsi;
1761 bool sigchld = false;
1766 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1771 if (errno == EAGAIN)
1777 switch (sfsi.ssi_signo) {
1784 if (m->running_as == MANAGER_INIT) {
1785 /* This is for compatibility with the
1786 * original sysvinit */
1787 m->exit_code = MANAGER_REEXECUTE;
1794 if (m->running_as == MANAGER_INIT) {
1795 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
1799 /* Run the exit target if there is one, if not, just exit. */
1800 if (manager_start_target(m, SPECIAL_EXIT_SERVICE, JOB_REPLACE) < 0) {
1801 m->exit_code = MANAGER_EXIT;
1808 if (m->running_as == MANAGER_INIT)
1809 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
1811 /* This is a nop on non-init */
1815 if (m->running_as == MANAGER_INIT)
1816 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
1818 /* This is a nop on non-init */
1824 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1826 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
1827 log_info("Trying to reconnect to bus...");
1832 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
1833 log_info("Loading D-Bus service...");
1834 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
1845 if (!(f = open_memstream(&dump, &size))) {
1846 log_warning("Failed to allocate memory stream.");
1850 manager_dump_units(m, f, "\t");
1851 manager_dump_jobs(m, f, "\t");
1856 log_warning("Failed to write status stream");
1861 log_dump(LOG_INFO, dump);
1868 m->exit_code = MANAGER_RELOAD;
1872 static const char * const table[] = {
1873 [0] = SPECIAL_DEFAULT_TARGET,
1874 [1] = SPECIAL_RESCUE_TARGET,
1875 [2] = SPECIAL_EMERGENCY_SERVICE,
1876 [3] = SPECIAL_HALT_TARGET,
1877 [4] = SPECIAL_POWEROFF_TARGET,
1878 [5] = SPECIAL_REBOOT_TARGET
1881 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
1882 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(table)) {
1883 manager_start_target(m, table[sfsi.ssi_signo - SIGRTMIN],
1884 sfsi.ssi_signo == 2 ? JOB_ISOLATE : JOB_REPLACE);
1888 log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
1894 return manager_dispatch_sigchld(m);
1899 static int process_event(Manager *m, struct epoll_event *ev) {
1906 assert(w = ev->data.ptr);
1912 /* An incoming signal? */
1913 if (ev->events != EPOLLIN)
1916 if ((r = manager_process_signal_fd(m)) < 0)
1923 /* An incoming daemon notification event? */
1924 if (ev->events != EPOLLIN)
1927 if ((r = manager_process_notify_fd(m)) < 0)
1934 /* Some fd event, to be dispatched to the units */
1935 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1942 /* Some timer event, to be dispatched to the units */
1943 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1945 if (k < 0 && (errno == EINTR || errno == EAGAIN))
1948 return k < 0 ? -errno : -EIO;
1951 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1956 /* Some mount table change, intended for the mount subsystem */
1957 mount_fd_event(m, ev->events);
1961 /* Some notification from udev, intended for the device subsystem */
1962 device_fd_event(m, ev->events);
1965 case WATCH_DBUS_WATCH:
1966 bus_watch_event(m, w, ev->events);
1969 case WATCH_DBUS_TIMEOUT:
1970 bus_timeout_event(m, w, ev->events);
1974 assert_not_reached("Unknown epoll event type.");
1980 int manager_loop(Manager *m) {
1983 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
1986 m->exit_code = MANAGER_RUNNING;
1988 /* There might still be some zombies hanging around from
1989 * before we were exec()'ed. Leat's reap them */
1990 if ((r = manager_dispatch_sigchld(m)) < 0)
1993 while (m->exit_code == MANAGER_RUNNING) {
1994 struct epoll_event event;
1997 if (!ratelimit_test(&rl)) {
1998 /* Yay, something is going seriously wrong, pause a little */
1999 log_warning("Looping too fast. Throttling execution a little.");
2003 if (manager_dispatch_load_queue(m) > 0)
2006 if (manager_dispatch_run_queue(m) > 0)
2009 if (bus_dispatch(m) > 0)
2012 if (manager_dispatch_cleanup_queue(m) > 0)
2015 if (manager_dispatch_gc_queue(m) > 0)
2018 if (manager_dispatch_dbus_queue(m) > 0)
2021 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2031 if ((r = process_event(m, &event)) < 0)
2035 return m->exit_code;
2038 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2046 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2049 if (!(n = bus_path_unescape(s+31)))
2052 u = manager_get_unit(m, n);
2063 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2072 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2075 if ((r = safe_atou(s + 30, &id)) < 0)
2078 if (!(j = manager_get_job(m, id)))
2086 static bool manager_utmp_good(Manager *m) {
2091 if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
2094 log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
2102 void manager_write_utmp_reboot(Manager *m) {
2107 if (m->utmp_reboot_written)
2110 if (m->running_as != MANAGER_INIT)
2113 if (!manager_utmp_good(m))
2116 if ((r = utmp_put_reboot(m->startup_timestamp.realtime)) < 0) {
2118 if (r != -ENOENT && r != -EROFS)
2119 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2124 m->utmp_reboot_written = true;
2127 void manager_write_utmp_runlevel(Manager *m, Unit *u) {
2133 if (u->meta.type != UNIT_TARGET)
2136 if (m->running_as != MANAGER_INIT)
2139 if (!manager_utmp_good(m))
2142 if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
2145 if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
2147 if (r != -ENOENT && r != -EROFS)
2148 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2152 void manager_dispatch_bus_name_owner_changed(
2155 const char* old_owner,
2156 const char *new_owner) {
2163 if (!(u = hashmap_get(m->watch_bus, name)))
2166 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2169 void manager_dispatch_bus_query_pid_done(
2180 if (!(u = hashmap_get(m->watch_bus, name)))
2183 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2186 int manager_open_serialization(FILE **_f) {
2194 if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2197 saved_umask = umask(0077);
2198 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2208 log_debug("Serializing state to %s", path);
2211 if (!(f = fdopen(fd, "w+")) < 0)
2219 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2229 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2230 if (u->meta.id != t)
2233 if (!unit_can_serialize(u))
2237 fputs(u->meta.id, f);
2240 if ((r = unit_serialize(u, f, fds)) < 0)
2250 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2256 log_debug("Deserializing state...");
2260 char name[UNIT_NAME_MAX+2];
2263 if (!fgets(name, sizeof(name), f)) {
2272 if ((r = manager_load_unit(m, strstrip(name), NULL, &u)) < 0)
2275 if ((r = unit_deserialize(u, f, fds)) < 0)
2285 int manager_reload(Manager *m) {
2292 if ((r = manager_open_serialization(&f)) < 0)
2295 if (!(fds = fdset_new())) {
2300 if ((r = manager_serialize(m, f, fds)) < 0)
2303 if (fseeko(f, 0, SEEK_SET) < 0) {
2308 /* From here on there is no way back. */
2309 manager_clear_jobs_and_units(m);
2311 /* Find new unit paths */
2312 lookup_paths_free(&m->lookup_paths);
2313 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2316 /* First, enumerate what we can from all config files */
2317 if ((q = manager_enumerate(m)) < 0)
2320 /* Second, deserialize our stored data */
2321 if ((q = manager_deserialize(m, f, fds)) < 0)
2327 /* Third, fire things up! */
2328 if ((q = manager_coldplug(m)) < 0)
2341 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2342 [MANAGER_INIT] = "init",
2343 [MANAGER_SYSTEM] = "system",
2344 [MANAGER_SESSION] = "session"
2347 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);