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>
37 #include <sys/types.h>
46 #include "ratelimit.h"
48 #include "mount-setup.h"
49 #include "utmp-wtmp.h"
50 #include "unit-name.h"
51 #include "dbus-unit.h"
54 #include "path-lookup.h"
57 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
58 #define GC_QUEUE_ENTRIES_MAX 16
60 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
61 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
63 /* Where clients shall send notification messages to */
64 #define NOTIFY_SOCKET "/org/freedesktop/systemd1/notify"
66 static int manager_setup_notify(Manager *m) {
69 struct sockaddr_un un;
71 struct epoll_event ev;
76 m->notify_watch.type = WATCH_NOTIFY;
77 if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
78 log_error("Failed to allocate notification socket: %m");
83 sa.sa.sa_family = AF_UNIX;
85 if (m->running_as == MANAGER_SESSION)
86 snprintf(sa.un.sun_path+1, sizeof(sa.un.sun_path)-1, NOTIFY_SOCKET "/%llu", random_ull());
88 strncpy(sa.un.sun_path+1, NOTIFY_SOCKET, sizeof(sa.un.sun_path)-1);
90 if (bind(m->notify_watch.fd, &sa.sa, sizeof(sa)) < 0) {
91 log_error("bind() failed: %m");
95 if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
96 log_error("SO_PASSCRED failed: %m");
102 ev.data.ptr = &m->notify_watch;
104 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
107 if (!(m->notify_socket = strdup(sa.un.sun_path+1)))
113 static int enable_special_signals(Manager *m) {
118 /* Enable that we get SIGINT on control-alt-del */
119 if (reboot(RB_DISABLE_CAD) < 0)
120 log_warning("Failed to enable ctrl-alt-del handling: %m");
122 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
123 log_warning("Failed to open /dev/tty0: %m");
125 /* Enable that we get SIGWINCH on kbrequest */
126 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
127 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
129 close_nointr_nofail(fd);
135 static int manager_setup_signals(Manager *m) {
137 struct epoll_event ev;
142 /* We are not interested in SIGSTOP and friends. */
144 sa.sa_handler = SIG_DFL;
145 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
146 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
148 assert_se(sigemptyset(&mask) == 0);
150 sigset_add_many(&mask,
151 SIGCHLD, /* Child died */
152 SIGTERM, /* Reexecute daemon */
153 SIGHUP, /* Reload configuration */
154 SIGUSR1, /* systemd/upstart: reconnect to D-Bus */
155 SIGUSR2, /* systemd: dump status */
156 SIGINT, /* Kernel sends us this on control-alt-del */
157 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
158 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
159 SIGRTMIN+0, /* systemd: start default.target */
160 SIGRTMIN+1, /* systemd: start rescue.target */
161 SIGRTMIN+2, /* systemd: isolate emergency.target */
162 SIGRTMIN+3, /* systemd: start halt.target */
163 SIGRTMIN+4, /* systemd: start poweroff.target */
164 SIGRTMIN+5, /* systemd: start reboot.target */
166 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
168 m->signal_watch.type = WATCH_SIGNAL;
169 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
174 ev.data.ptr = &m->signal_watch;
176 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
179 if (m->running_as == MANAGER_SYSTEM)
180 return enable_special_signals(m);
185 int manager_new(ManagerRunningAs running_as, Manager **_m) {
191 assert(running_as >= 0);
192 assert(running_as < _MANAGER_RUNNING_AS_MAX);
194 if (!(m = new0(Manager, 1)))
197 dual_timestamp_get(&m->startup_timestamp);
199 m->running_as = running_as;
200 m->name_data_slot = m->subscribed_data_slot = -1;
201 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
202 m->pin_cgroupfs_fd = -1;
204 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = -1;
205 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
207 if (!(m->environment = strv_copy(environ)))
210 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
213 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
216 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
219 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
222 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
225 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
228 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
231 if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
234 if ((r = manager_setup_signals(m)) < 0)
237 if ((r = manager_setup_cgroup(m)) < 0)
240 if ((r = manager_setup_notify(m)) < 0)
243 /* Try to connect to the busses, if possible. */
244 if ((r = bus_init(m)) < 0)
247 if (asprintf(&p, "%s/%s", m->cgroup_mount_point, m->cgroup_hierarchy) < 0) {
252 m->pin_cgroupfs_fd = open(p, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
263 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
269 while ((meta = m->cleanup_queue)) {
270 assert(meta->in_cleanup_queue);
272 unit_free((Unit*) meta);
280 GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */
281 GC_OFFSET_UNSURE, /* No clue */
282 GC_OFFSET_GOOD, /* We still need this unit */
283 GC_OFFSET_BAD, /* We don't need this unit anymore */
287 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
294 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
295 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
296 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
299 if (u->meta.in_cleanup_queue)
302 if (unit_check_gc(u))
305 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
309 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
310 unit_gc_sweep(other, gc_marker);
312 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
315 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
322 /* We were unable to find anything out about this entry, so
323 * let's investigate it later */
324 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
325 unit_add_to_gc_queue(u);
329 /* We definitely know that this one is not useful anymore, so
330 * let's mark it for deletion */
331 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
332 unit_add_to_cleanup_queue(u);
336 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
339 static unsigned manager_dispatch_gc_queue(Manager *m) {
346 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
347 (m->gc_queue_timestamp <= 0 ||
348 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
351 log_debug("Running GC...");
353 m->gc_marker += _GC_OFFSET_MAX;
354 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
357 gc_marker = m->gc_marker;
359 while ((meta = m->gc_queue)) {
360 assert(meta->in_gc_queue);
362 unit_gc_sweep((Unit*) meta, gc_marker);
364 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
365 meta->in_gc_queue = false;
369 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
370 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
371 log_debug("Collecting %s", meta->id);
372 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
373 unit_add_to_cleanup_queue((Unit*) meta);
377 m->n_in_gc_queue = 0;
378 m->gc_queue_timestamp = 0;
383 static void manager_clear_jobs_and_units(Manager *m) {
389 while ((j = hashmap_first(m->transaction_jobs)))
392 while ((u = hashmap_first(m->units)))
395 manager_dispatch_cleanup_queue(m);
397 assert(!m->load_queue);
398 assert(!m->run_queue);
399 assert(!m->dbus_unit_queue);
400 assert(!m->dbus_job_queue);
401 assert(!m->cleanup_queue);
402 assert(!m->gc_queue);
404 assert(hashmap_isempty(m->transaction_jobs));
405 assert(hashmap_isempty(m->jobs));
406 assert(hashmap_isempty(m->units));
409 void manager_free(Manager *m) {
414 manager_clear_jobs_and_units(m);
416 for (c = 0; c < _UNIT_TYPE_MAX; c++)
417 if (unit_vtable[c]->shutdown)
418 unit_vtable[c]->shutdown(m);
420 /* If we reexecute ourselves, we keep the root cgroup
422 if (m->exit_code != MANAGER_REEXECUTE)
423 manager_shutdown_cgroup(m);
427 hashmap_free(m->units);
428 hashmap_free(m->jobs);
429 hashmap_free(m->transaction_jobs);
430 hashmap_free(m->watch_pids);
431 hashmap_free(m->watch_bus);
433 if (m->epoll_fd >= 0)
434 close_nointr_nofail(m->epoll_fd);
435 if (m->signal_watch.fd >= 0)
436 close_nointr_nofail(m->signal_watch.fd);
437 if (m->notify_watch.fd >= 0)
438 close_nointr_nofail(m->notify_watch.fd);
440 free(m->notify_socket);
442 lookup_paths_free(&m->lookup_paths);
443 strv_free(m->environment);
445 free(m->cgroup_controller);
446 free(m->cgroup_hierarchy);
447 free(m->cgroup_mount_point);
449 hashmap_free(m->cgroup_bondings);
451 if (m->pin_cgroupfs_fd >= 0)
452 close_nointr_nofail(m->pin_cgroupfs_fd);
457 int manager_enumerate(Manager *m) {
463 /* Let's ask every type to load all units from disk/kernel
464 * that it might know */
465 for (c = 0; c < _UNIT_TYPE_MAX; c++)
466 if (unit_vtable[c]->enumerate)
467 if ((q = unit_vtable[c]->enumerate(m)) < 0)
470 manager_dispatch_load_queue(m);
474 int manager_coldplug(Manager *m) {
482 /* Then, let's set up their initial state. */
483 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
489 if ((q = unit_coldplug(u)) < 0)
496 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
501 /* First, enumerate what we can from all config files */
502 r = manager_enumerate(m);
504 /* Second, deserialize if there is something to deserialize */
506 if ((q = manager_deserialize(m, serialization, fds)) < 0)
509 /* Third, fire things up! */
510 if ((q = manager_coldplug(m)) < 0)
513 /* Now that the initial devices are available, let's see if we
514 * can write the utmp file */
515 manager_write_utmp_reboot(m);
520 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
524 /* Deletes one job from the transaction */
526 manager_transaction_unlink_job(m, j, delete_dependencies);
532 static void transaction_delete_unit(Manager *m, Unit *u) {
535 /* Deletes all jobs associated with a certain unit from the
538 while ((j = hashmap_get(m->transaction_jobs, u)))
539 transaction_delete_job(m, j, true);
542 static void transaction_clean_dependencies(Manager *m) {
548 /* Drops all dependencies of all installed jobs */
550 HASHMAP_FOREACH(j, m->jobs, i) {
551 while (j->subject_list)
552 job_dependency_free(j->subject_list);
553 while (j->object_list)
554 job_dependency_free(j->object_list);
557 assert(!m->transaction_anchor);
560 static void transaction_abort(Manager *m) {
565 while ((j = hashmap_first(m->transaction_jobs)))
567 transaction_delete_job(m, j, true);
571 assert(hashmap_isempty(m->transaction_jobs));
573 transaction_clean_dependencies(m);
576 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
581 /* A recursive sweep through the graph that marks all units
582 * that matter to the anchor job, i.e. are directly or
583 * indirectly a dependency of the anchor job via paths that
584 * are fully marked as mattering. */
589 l = m->transaction_anchor;
591 LIST_FOREACH(subject, l, l) {
593 /* This link does not matter */
597 /* This unit has already been marked */
598 if (l->object->generation == generation)
601 l->object->matters_to_anchor = true;
602 l->object->generation = generation;
604 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
608 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
609 JobDependency *l, *last;
613 assert(j->unit == other->unit);
614 assert(!j->installed);
616 /* Merges 'other' into 'j' and then deletes j. */
619 j->state = JOB_WAITING;
620 j->override = j->override || other->override;
622 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
624 /* Patch us in as new owner of the JobDependency objects */
626 LIST_FOREACH(subject, l, other->subject_list) {
627 assert(l->subject == other);
632 /* Merge both lists */
634 last->subject_next = j->subject_list;
636 j->subject_list->subject_prev = last;
637 j->subject_list = other->subject_list;
640 /* Patch us in as new owner of the JobDependency objects */
642 LIST_FOREACH(object, l, other->object_list) {
643 assert(l->object == other);
648 /* Merge both lists */
650 last->object_next = j->object_list;
652 j->object_list->object_prev = last;
653 j->object_list = other->object_list;
656 /* Kill the other job */
657 other->subject_list = NULL;
658 other->object_list = NULL;
659 transaction_delete_job(m, other, true);
662 static int delete_one_unmergeable_job(Manager *m, Job *j) {
667 /* Tries to delete one item in the linked list
668 * j->transaction_next->transaction_next->... that conflicts
669 * whith another one, in an attempt to make an inconsistent
670 * transaction work. */
672 /* We rely here on the fact that if a merged with b does not
673 * merge with c, either a or b merge with c neither */
674 LIST_FOREACH(transaction, j, j)
675 LIST_FOREACH(transaction, k, j->transaction_next) {
678 /* Is this one mergeable? Then skip it */
679 if (job_type_is_mergeable(j->type, k->type))
682 /* Ok, we found two that conflict, let's see if we can
683 * drop one of them */
684 if (!j->matters_to_anchor)
686 else if (!k->matters_to_anchor)
691 /* Ok, we can drop one, so let's do so. */
692 log_notice("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
693 transaction_delete_job(m, d, true);
700 static int transaction_merge_jobs(Manager *m) {
707 /* First step, check whether any of the jobs for one specific
708 * task conflict. If so, try to drop one of them. */
709 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
714 LIST_FOREACH(transaction, k, j->transaction_next) {
715 if ((r = job_type_merge(&t, k->type)) >= 0)
718 /* OK, we could not merge all jobs for this
719 * action. Let's see if we can get rid of one
722 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
723 /* Ok, we managed to drop one, now
724 * let's ask our callers to call us
725 * again after garbage collecting */
728 /* We couldn't merge anything. Failure */
733 /* Second step, merge the jobs. */
734 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
738 /* Merge all transactions */
739 LIST_FOREACH(transaction, k, j->transaction_next)
740 assert_se(job_type_merge(&t, k->type) == 0);
742 /* If an active job is mergeable, merge it too */
743 if (j->unit->meta.job)
744 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
746 while ((k = j->transaction_next)) {
748 transaction_merge_and_delete_job(m, k, j, t);
751 transaction_merge_and_delete_job(m, j, k, t);
754 assert(!j->transaction_next);
755 assert(!j->transaction_prev);
761 static void transaction_drop_redundant(Manager *m) {
766 /* Goes through the transaction and removes all jobs that are
775 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
776 bool changes_something = false;
779 LIST_FOREACH(transaction, k, j) {
781 if (!job_is_anchor(k) &&
782 job_type_is_redundant(k->type, unit_active_state(k->unit)))
785 changes_something = true;
789 if (changes_something)
792 log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
793 transaction_delete_job(m, j, false);
801 static bool unit_matters_to_anchor(Unit *u, Job *j) {
803 assert(!j->transaction_prev);
805 /* Checks whether at least one of the jobs for this unit
806 * matters to the anchor. */
808 LIST_FOREACH(transaction, j, j)
809 if (j->matters_to_anchor)
815 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
822 assert(!j->transaction_prev);
824 /* Does a recursive sweep through the ordering graph, looking
825 * for a cycle. If we find cycle we try to break it. */
827 /* Have we seen this before? */
828 if (j->generation == generation) {
831 /* If the marker is NULL we have been here already and
832 * decided the job was loop-free from here. Hence
833 * shortcut things and return right-away. */
837 /* So, the marker is not NULL and we already have been
838 * here. We have a cycle. Let's try to break it. We go
839 * backwards in our path and try to find a suitable
840 * job to remove. We use the marker to find our way
841 * back, since smart how we are we stored our way back
843 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
845 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
847 log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
850 !unit_matters_to_anchor(k->unit, k)) {
851 /* Ok, we can drop this one, so let's
853 log_warning("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
854 transaction_delete_unit(m, k->unit);
858 /* Check if this in fact was the beginning of
864 log_error("Unable to break cycle");
869 /* Make the marker point to where we come from, so that we can
870 * find our way backwards if we want to break a cycle. We use
871 * a special marker for the beginning: we point to
873 j->marker = from ? from : j;
874 j->generation = generation;
876 /* We assume that the the dependencies are bidirectional, and
877 * hence can ignore UNIT_AFTER */
878 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
881 /* Is there a job for this unit? */
882 if (!(o = hashmap_get(m->transaction_jobs, u)))
884 /* Ok, there is no job for this in the
885 * transaction, but maybe there is already one
887 if (!(o = u->meta.job))
890 if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
894 /* Ok, let's backtrack, and remember that this entry is not on
895 * our path anymore. */
901 static int transaction_verify_order(Manager *m, unsigned *generation) {
910 /* Check if the ordering graph is cyclic. If it is, try to fix
911 * that up by dropping one of the jobs. */
915 HASHMAP_FOREACH(j, m->transaction_jobs, i)
916 if ((r = transaction_verify_order_one(m, j, NULL, g)) < 0)
922 static void transaction_collect_garbage(Manager *m) {
927 /* Drop jobs that are not required by any other job */
935 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
939 log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
940 transaction_delete_job(m, j, true);
948 static int transaction_is_destructive(Manager *m) {
954 /* Checks whether applying this transaction means that
955 * existing jobs would be replaced */
957 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
960 assert(!j->transaction_prev);
961 assert(!j->transaction_next);
963 if (j->unit->meta.job &&
964 j->unit->meta.job != j &&
965 !job_type_is_superset(j->type, j->unit->meta.job->type))
972 static void transaction_minimize_impact(Manager *m) {
976 /* Drops all unnecessary jobs that reverse already active jobs
977 * or that stop a running service. */
985 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
986 LIST_FOREACH(transaction, j, j) {
987 bool stops_running_service, changes_existing_job;
989 /* If it matters, we shouldn't drop it */
990 if (j->matters_to_anchor)
993 /* Would this stop a running service?
994 * Would this change an existing job?
995 * If so, let's drop this entry */
997 stops_running_service =
998 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1000 changes_existing_job =
1001 j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
1003 if (!stops_running_service && !changes_existing_job)
1006 if (stops_running_service)
1007 log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1009 if (changes_existing_job)
1010 log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1012 /* Ok, let's get rid of this */
1013 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1015 transaction_delete_job(m, j, true);
1027 static int transaction_apply(Manager *m) {
1032 /* Moves the transaction jobs to the set of active jobs */
1034 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1036 assert(!j->transaction_prev);
1037 assert(!j->transaction_next);
1042 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1046 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1050 if (j->unit->meta.job)
1051 job_free(j->unit->meta.job);
1053 j->unit->meta.job = j;
1054 j->installed = true;
1056 /* We're fully installed. Now let's free data we don't
1059 assert(!j->transaction_next);
1060 assert(!j->transaction_prev);
1062 job_add_to_run_queue(j);
1063 job_add_to_dbus_queue(j);
1066 /* As last step, kill all remaining job dependencies. */
1067 transaction_clean_dependencies(m);
1073 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1077 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1083 static int transaction_activate(Manager *m, JobMode mode) {
1085 unsigned generation = 1;
1089 /* This applies the changes recorded in transaction_jobs to
1090 * the actual list of jobs, if possible. */
1092 /* First step: figure out which jobs matter */
1093 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1095 /* Second step: Try not to stop any running services if
1096 * we don't have to. Don't try to reverse running
1097 * jobs if we don't have to. */
1098 transaction_minimize_impact(m);
1100 /* Third step: Drop redundant jobs */
1101 transaction_drop_redundant(m);
1104 /* Fourth step: Let's remove unneeded jobs that might
1106 transaction_collect_garbage(m);
1108 /* Fifth step: verify order makes sense and correct
1109 * cycles if necessary and possible */
1110 if ((r = transaction_verify_order(m, &generation)) >= 0)
1114 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
1118 /* Let's see if the resulting transaction ordering
1119 * graph is still cyclic... */
1123 /* Sixth step: let's drop unmergeable entries if
1124 * necessary and possible, merge entries we can
1126 if ((r = transaction_merge_jobs(m)) >= 0)
1130 log_warning("Requested transaction contains unmergable jobs: %s", strerror(-r));
1134 /* Seventh step: an entry got dropped, let's garbage
1135 * collect its dependencies. */
1136 transaction_collect_garbage(m);
1138 /* Let's see if the resulting transaction still has
1139 * unmergeable entries ... */
1142 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1143 transaction_drop_redundant(m);
1145 /* Ninth step: check whether we can actually apply this */
1146 if (mode == JOB_FAIL)
1147 if ((r = transaction_is_destructive(m)) < 0) {
1148 log_notice("Requested transaction contradicts existing jobs: %s", strerror(-r));
1152 /* Tenth step: apply changes */
1153 if ((r = transaction_apply(m)) < 0) {
1154 log_warning("Failed to apply transaction: %s", strerror(-r));
1158 assert(hashmap_isempty(m->transaction_jobs));
1159 assert(!m->transaction_anchor);
1164 transaction_abort(m);
1168 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1175 /* Looks for an axisting prospective job and returns that. If
1176 * it doesn't exist it is created and added to the prospective
1179 f = hashmap_get(m->transaction_jobs, unit);
1181 LIST_FOREACH(transaction, j, f) {
1182 assert(j->unit == unit);
1184 if (j->type == type) {
1191 if (unit->meta.job && unit->meta.job->type == type)
1193 else if (!(j = job_new(m, type, unit)))
1198 j->matters_to_anchor = false;
1199 j->override = override;
1201 LIST_PREPEND(Job, transaction, f, j);
1203 if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1211 log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1216 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1220 if (j->transaction_prev)
1221 j->transaction_prev->transaction_next = j->transaction_next;
1222 else if (j->transaction_next)
1223 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1225 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1227 if (j->transaction_next)
1228 j->transaction_next->transaction_prev = j->transaction_prev;
1230 j->transaction_prev = j->transaction_next = NULL;
1232 while (j->subject_list)
1233 job_dependency_free(j->subject_list);
1235 while (j->object_list) {
1236 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1238 job_dependency_free(j->object_list);
1240 if (other && delete_dependencies) {
1241 log_info("Deleting job %s/%s as dependency of job %s/%s",
1242 other->unit->meta.id, job_type_to_string(other->type),
1243 j->unit->meta.id, job_type_to_string(j->type));
1244 transaction_delete_job(m, other, delete_dependencies);
1249 static int transaction_add_job_and_dependencies(
1264 assert(type < _JOB_TYPE_MAX);
1267 if (unit->meta.load_state != UNIT_LOADED)
1270 if (!unit_job_is_applicable(unit, type))
1273 /* First add the job. */
1274 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1277 /* Then, add a link to the job. */
1278 if (!job_dependency_new(by, ret, matters))
1282 /* Finally, recursively add in all dependencies. */
1283 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1284 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1285 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1288 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1289 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1290 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1292 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1293 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0)
1294 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1296 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1297 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1300 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1301 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1302 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1304 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1305 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1308 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1310 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1311 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1315 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1327 static int transaction_add_isolate_jobs(Manager *m) {
1335 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1337 /* ignore aliases */
1338 if (u->meta.id != k)
1341 if (UNIT_VTABLE(u)->no_isolate)
1344 /* No need to stop inactive jobs */
1345 if (UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(u)))
1348 /* Is there already something listed for this? */
1349 if (hashmap_get(m->transaction_jobs, u))
1352 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL)) < 0)
1353 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1359 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) {
1364 assert(type < _JOB_TYPE_MAX);
1366 assert(mode < _JOB_MODE_MAX);
1368 if (mode == JOB_ISOLATE && type != JOB_START)
1371 log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
1373 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) {
1374 transaction_abort(m);
1378 if (mode == JOB_ISOLATE)
1379 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1380 transaction_abort(m);
1384 if ((r = transaction_activate(m, mode)) < 0)
1387 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1395 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, Job **_ret) {
1400 assert(type < _JOB_TYPE_MAX);
1402 assert(mode < _JOB_MODE_MAX);
1404 if ((r = manager_load_unit(m, name, NULL, &unit)) < 0)
1407 return manager_add_job(m, type, unit, mode, override, _ret);
1410 Job *manager_get_job(Manager *m, uint32_t id) {
1413 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1416 Unit *manager_get_unit(Manager *m, const char *name) {
1420 return hashmap_get(m->units, name);
1423 unsigned manager_dispatch_load_queue(Manager *m) {
1429 /* Make sure we are not run recursively */
1430 if (m->dispatching_load_queue)
1433 m->dispatching_load_queue = true;
1435 /* Dispatches the load queue. Takes a unit from the queue and
1436 * tries to load its data until the queue is empty */
1438 while ((meta = m->load_queue)) {
1439 assert(meta->in_load_queue);
1441 unit_load((Unit*) meta);
1445 m->dispatching_load_queue = false;
1449 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) {
1454 assert(name || path);
1456 /* This will prepare the unit for loading, but not actually
1457 * load anything from disk. */
1459 if (path && !is_path(path))
1463 name = file_name_from_path(path);
1465 if (!unit_name_is_valid(name))
1468 if ((ret = manager_get_unit(m, name))) {
1473 if (!(ret = unit_new(m)))
1477 if (!(ret->meta.fragment_path = strdup(path))) {
1482 if ((r = unit_add_name(ret, name)) < 0) {
1487 unit_add_to_load_queue(ret);
1488 unit_add_to_dbus_queue(ret);
1489 unit_add_to_gc_queue(ret);
1497 int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) {
1502 /* This will load the service information files, but not actually
1503 * start any services or anything. */
1505 if ((r = manager_load_unit_prepare(m, name, path, _ret)) != 0)
1508 manager_dispatch_load_queue(m);
1511 *_ret = unit_follow_merge(*_ret);
1516 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1523 HASHMAP_FOREACH(j, s->jobs, i)
1524 job_dump(j, f, prefix);
1527 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1535 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1536 if (u->meta.id == t)
1537 unit_dump(u, f, prefix);
1540 void manager_clear_jobs(Manager *m) {
1545 transaction_abort(m);
1547 while ((j = hashmap_first(m->jobs)))
1551 unsigned manager_dispatch_run_queue(Manager *m) {
1555 if (m->dispatching_run_queue)
1558 m->dispatching_run_queue = true;
1560 while ((j = m->run_queue)) {
1561 assert(j->installed);
1562 assert(j->in_run_queue);
1564 job_run_and_invalidate(j);
1568 m->dispatching_run_queue = false;
1572 unsigned manager_dispatch_dbus_queue(Manager *m) {
1579 if (m->dispatching_dbus_queue)
1582 m->dispatching_dbus_queue = true;
1584 while ((meta = m->dbus_unit_queue)) {
1585 assert(meta->in_dbus_queue);
1587 bus_unit_send_change_signal((Unit*) meta);
1591 while ((j = m->dbus_job_queue)) {
1592 assert(j->in_dbus_queue);
1594 bus_job_send_change_signal(j);
1598 m->dispatching_dbus_queue = false;
1602 static int manager_process_notify_fd(Manager *m) {
1609 struct msghdr msghdr;
1611 struct ucred *ucred;
1613 struct cmsghdr cmsghdr;
1614 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1620 iovec.iov_base = buf;
1621 iovec.iov_len = sizeof(buf)-1;
1625 msghdr.msg_iov = &iovec;
1626 msghdr.msg_iovlen = 1;
1627 msghdr.msg_control = &control;
1628 msghdr.msg_controllen = sizeof(control);
1630 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1634 if (errno == EAGAIN)
1640 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1641 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1642 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1643 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1644 log_warning("Received notify message without credentials. Ignoring.");
1648 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1650 if (!(u = hashmap_get(m->watch_pids, UINT32_TO_PTR(ucred->pid))))
1651 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1652 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1656 assert((size_t) n < sizeof(buf));
1658 if (!(tags = strv_split(buf, "\n\r")))
1661 log_debug("Got notification message for unit %s", u->meta.id);
1663 if (UNIT_VTABLE(u)->notify_message)
1664 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1672 static int manager_dispatch_sigchld(Manager *m) {
1682 /* First we call waitd() for a PID and do not reap the
1683 * zombie. That way we can still access /proc/$PID for
1684 * it while it is a zombie. */
1685 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1687 if (errno == ECHILD)
1699 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1702 get_process_name(si.si_pid, &name);
1703 log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1707 /* Let's flush any message the dying child might still
1708 * have queued for us. This ensures that the process
1709 * still exists in /proc so that we can figure out
1710 * which cgroup and hence unit it belongs to. */
1711 if ((r = manager_process_notify_fd(m)) < 0)
1714 /* And now figure out the unit this belongs to */
1715 if (!(u = hashmap_get(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
1716 u = cgroup_unit_by_pid(m, si.si_pid);
1718 /* And now, we actually reap the zombie. */
1719 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1726 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1729 log_debug("Child %lu died (code=%s, status=%i/%s)",
1730 (long unsigned) si.si_pid,
1731 sigchld_code_to_string(si.si_code),
1733 strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
1738 log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
1740 hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid));
1741 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1747 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
1750 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, NULL)) < 0)
1751 log_error("Failed to enqueue %s job: %s", name, strerror(-r));
1756 static int manager_process_signal_fd(Manager *m) {
1758 struct signalfd_siginfo sfsi;
1759 bool sigchld = false;
1764 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1769 if (errno == EAGAIN)
1775 switch (sfsi.ssi_signo) {
1782 if (m->running_as == MANAGER_SYSTEM) {
1783 /* This is for compatibility with the
1784 * original sysvinit */
1785 m->exit_code = MANAGER_REEXECUTE;
1792 if (m->running_as == MANAGER_SYSTEM) {
1793 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
1797 /* Run the exit target if there is one, if not, just exit. */
1798 if (manager_start_target(m, SPECIAL_EXIT_SERVICE, JOB_REPLACE) < 0) {
1799 m->exit_code = MANAGER_EXIT;
1806 if (m->running_as == MANAGER_SYSTEM)
1807 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
1809 /* This is a nop on non-init */
1813 if (m->running_as == MANAGER_SYSTEM)
1814 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
1816 /* This is a nop on non-init */
1822 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1824 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
1825 log_info("Trying to reconnect to bus...");
1829 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
1830 log_info("Loading D-Bus service...");
1831 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
1842 if (!(f = open_memstream(&dump, &size))) {
1843 log_warning("Failed to allocate memory stream.");
1847 manager_dump_units(m, f, "\t");
1848 manager_dump_jobs(m, f, "\t");
1853 log_warning("Failed to write status stream");
1858 log_dump(LOG_INFO, dump);
1865 m->exit_code = MANAGER_RELOAD;
1869 static const char * const table[] = {
1870 [0] = SPECIAL_DEFAULT_TARGET,
1871 [1] = SPECIAL_RESCUE_TARGET,
1872 [2] = SPECIAL_EMERGENCY_SERVICE,
1873 [3] = SPECIAL_HALT_TARGET,
1874 [4] = SPECIAL_POWEROFF_TARGET,
1875 [5] = SPECIAL_REBOOT_TARGET
1878 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
1879 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(table)) {
1880 manager_start_target(m, table[sfsi.ssi_signo - SIGRTMIN],
1881 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
1885 log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
1891 return manager_dispatch_sigchld(m);
1896 static int process_event(Manager *m, struct epoll_event *ev) {
1903 assert(w = ev->data.ptr);
1909 /* An incoming signal? */
1910 if (ev->events != EPOLLIN)
1913 if ((r = manager_process_signal_fd(m)) < 0)
1920 /* An incoming daemon notification event? */
1921 if (ev->events != EPOLLIN)
1924 if ((r = manager_process_notify_fd(m)) < 0)
1931 /* Some fd event, to be dispatched to the units */
1932 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1939 /* Some timer event, to be dispatched to the units */
1940 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1942 if (k < 0 && (errno == EINTR || errno == EAGAIN))
1945 return k < 0 ? -errno : -EIO;
1948 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1953 /* Some mount table change, intended for the mount subsystem */
1954 mount_fd_event(m, ev->events);
1958 /* Some notification from udev, intended for the device subsystem */
1959 device_fd_event(m, ev->events);
1962 case WATCH_DBUS_WATCH:
1963 bus_watch_event(m, w, ev->events);
1966 case WATCH_DBUS_TIMEOUT:
1967 bus_timeout_event(m, w, ev->events);
1971 assert_not_reached("Unknown epoll event type.");
1977 int manager_loop(Manager *m) {
1980 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
1983 m->exit_code = MANAGER_RUNNING;
1985 /* There might still be some zombies hanging around from
1986 * before we were exec()'ed. Leat's reap them */
1987 if ((r = manager_dispatch_sigchld(m)) < 0)
1990 while (m->exit_code == MANAGER_RUNNING) {
1991 struct epoll_event event;
1994 if (!ratelimit_test(&rl)) {
1995 /* Yay, something is going seriously wrong, pause a little */
1996 log_warning("Looping too fast. Throttling execution a little.");
2000 if (manager_dispatch_load_queue(m) > 0)
2003 if (manager_dispatch_run_queue(m) > 0)
2006 if (bus_dispatch(m) > 0)
2009 if (manager_dispatch_cleanup_queue(m) > 0)
2012 if (manager_dispatch_gc_queue(m) > 0)
2015 if (manager_dispatch_dbus_queue(m) > 0)
2018 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2028 if ((r = process_event(m, &event)) < 0)
2032 return m->exit_code;
2035 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2043 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2046 if (!(n = bus_path_unescape(s+31)))
2049 u = manager_get_unit(m, n);
2060 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2069 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2072 if ((r = safe_atou(s + 30, &id)) < 0)
2075 if (!(j = manager_get_job(m, id)))
2083 static bool manager_utmp_good(Manager *m) {
2088 if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
2091 log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
2099 void manager_write_utmp_reboot(Manager *m) {
2104 if (m->utmp_reboot_written)
2107 if (m->running_as != MANAGER_SYSTEM)
2110 if (!manager_utmp_good(m))
2113 if ((r = utmp_put_reboot(m->startup_timestamp.realtime)) < 0) {
2115 if (r != -ENOENT && r != -EROFS)
2116 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2121 m->utmp_reboot_written = true;
2124 void manager_write_utmp_runlevel(Manager *m, Unit *u) {
2130 if (u->meta.type != UNIT_TARGET)
2133 if (m->running_as != MANAGER_SYSTEM)
2136 if (!manager_utmp_good(m))
2139 if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
2142 if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
2144 if (r != -ENOENT && r != -EROFS)
2145 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2149 void manager_dispatch_bus_name_owner_changed(
2152 const char* old_owner,
2153 const char *new_owner) {
2160 if (!(u = hashmap_get(m->watch_bus, name)))
2163 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2166 void manager_dispatch_bus_query_pid_done(
2177 if (!(u = hashmap_get(m->watch_bus, name)))
2180 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2183 int manager_open_serialization(FILE **_f) {
2191 if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2194 saved_umask = umask(0077);
2195 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2205 log_debug("Serializing state to %s", path);
2208 if (!(f = fdopen(fd, "w+")) < 0)
2216 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2226 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2227 if (u->meta.id != t)
2230 if (!unit_can_serialize(u))
2234 fputs(u->meta.id, f);
2237 if ((r = unit_serialize(u, f, fds)) < 0)
2247 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2253 log_debug("Deserializing state...");
2257 char name[UNIT_NAME_MAX+2];
2260 if (!fgets(name, sizeof(name), f)) {
2269 if ((r = manager_load_unit(m, strstrip(name), NULL, &u)) < 0)
2272 if ((r = unit_deserialize(u, f, fds)) < 0)
2282 int manager_reload(Manager *m) {
2289 if ((r = manager_open_serialization(&f)) < 0)
2292 if (!(fds = fdset_new())) {
2297 if ((r = manager_serialize(m, f, fds)) < 0)
2300 if (fseeko(f, 0, SEEK_SET) < 0) {
2305 /* From here on there is no way back. */
2306 manager_clear_jobs_and_units(m);
2308 /* Find new unit paths */
2309 lookup_paths_free(&m->lookup_paths);
2310 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2313 /* First, enumerate what we can from all config files */
2314 if ((q = manager_enumerate(m)) < 0)
2317 /* Second, deserialize our stored data */
2318 if ((q = manager_deserialize(m, f, fds)) < 0)
2324 /* Third, fire things up! */
2325 if ((q = manager_coldplug(m)) < 0)
2338 bool manager_is_booting_or_shutting_down(Manager *m) {
2343 /* Is the initial job still around? */
2344 if (manager_get_job(m, 1))
2347 /* Is there a job for the shutdown target? */
2348 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2349 return !!u->meta.job;
2354 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2355 [MANAGER_SYSTEM] = "system",
2356 [MANAGER_SESSION] = "session"
2359 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);