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"
56 #include "bus-errors.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_SYSTEM)
181 return enable_special_signals(m);
186 int manager_new(ManagerRunningAs running_as, Manager **_m) {
192 assert(running_as >= 0);
193 assert(running_as < _MANAGER_RUNNING_AS_MAX);
195 if (!(m = new0(Manager, 1)))
198 dual_timestamp_get(&m->startup_timestamp);
200 m->running_as = running_as;
201 m->name_data_slot = m->subscribed_data_slot = -1;
202 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
203 m->pin_cgroupfs_fd = -1;
205 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = -1;
206 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
208 if (!(m->environment = strv_copy(environ)))
211 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
214 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
217 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
220 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
223 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
226 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
229 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
232 if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
235 if ((r = manager_setup_signals(m)) < 0)
238 if ((r = manager_setup_cgroup(m)) < 0)
241 if ((r = manager_setup_notify(m)) < 0)
244 /* Try to connect to the busses, if possible. */
245 if ((r = bus_init(m)) < 0)
248 if (asprintf(&p, "%s/%s", m->cgroup_mount_point, m->cgroup_hierarchy) < 0) {
253 m->pin_cgroupfs_fd = open(p, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
264 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
270 while ((meta = m->cleanup_queue)) {
271 assert(meta->in_cleanup_queue);
273 unit_free((Unit*) meta);
281 GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */
282 GC_OFFSET_UNSURE, /* No clue */
283 GC_OFFSET_GOOD, /* We still need this unit */
284 GC_OFFSET_BAD, /* We don't need this unit anymore */
288 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
295 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
296 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
297 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
300 if (u->meta.in_cleanup_queue)
303 if (unit_check_gc(u))
306 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
310 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
311 unit_gc_sweep(other, gc_marker);
313 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
316 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
323 /* We were unable to find anything out about this entry, so
324 * let's investigate it later */
325 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
326 unit_add_to_gc_queue(u);
330 /* We definitely know that this one is not useful anymore, so
331 * let's mark it for deletion */
332 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
333 unit_add_to_cleanup_queue(u);
337 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
340 static unsigned manager_dispatch_gc_queue(Manager *m) {
347 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
348 (m->gc_queue_timestamp <= 0 ||
349 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
352 log_debug("Running GC...");
354 m->gc_marker += _GC_OFFSET_MAX;
355 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
358 gc_marker = m->gc_marker;
360 while ((meta = m->gc_queue)) {
361 assert(meta->in_gc_queue);
363 unit_gc_sweep((Unit*) meta, gc_marker);
365 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
366 meta->in_gc_queue = false;
370 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
371 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
372 log_debug("Collecting %s", meta->id);
373 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
374 unit_add_to_cleanup_queue((Unit*) meta);
378 m->n_in_gc_queue = 0;
379 m->gc_queue_timestamp = 0;
384 static void manager_clear_jobs_and_units(Manager *m) {
390 while ((j = hashmap_first(m->transaction_jobs)))
393 while ((u = hashmap_first(m->units)))
396 manager_dispatch_cleanup_queue(m);
398 assert(!m->load_queue);
399 assert(!m->run_queue);
400 assert(!m->dbus_unit_queue);
401 assert(!m->dbus_job_queue);
402 assert(!m->cleanup_queue);
403 assert(!m->gc_queue);
405 assert(hashmap_isempty(m->transaction_jobs));
406 assert(hashmap_isempty(m->jobs));
407 assert(hashmap_isempty(m->units));
410 void manager_free(Manager *m) {
415 manager_clear_jobs_and_units(m);
417 for (c = 0; c < _UNIT_TYPE_MAX; c++)
418 if (unit_vtable[c]->shutdown)
419 unit_vtable[c]->shutdown(m);
421 /* If we reexecute ourselves, we keep the root cgroup
423 if (m->exit_code != MANAGER_REEXECUTE)
424 manager_shutdown_cgroup(m);
428 hashmap_free(m->units);
429 hashmap_free(m->jobs);
430 hashmap_free(m->transaction_jobs);
431 hashmap_free(m->watch_pids);
432 hashmap_free(m->watch_bus);
434 if (m->epoll_fd >= 0)
435 close_nointr_nofail(m->epoll_fd);
436 if (m->signal_watch.fd >= 0)
437 close_nointr_nofail(m->signal_watch.fd);
438 if (m->notify_watch.fd >= 0)
439 close_nointr_nofail(m->notify_watch.fd);
441 free(m->notify_socket);
443 lookup_paths_free(&m->lookup_paths);
444 strv_free(m->environment);
446 free(m->cgroup_controller);
447 free(m->cgroup_hierarchy);
448 free(m->cgroup_mount_point);
450 hashmap_free(m->cgroup_bondings);
452 if (m->pin_cgroupfs_fd >= 0)
453 close_nointr_nofail(m->pin_cgroupfs_fd);
458 int manager_enumerate(Manager *m) {
464 /* Let's ask every type to load all units from disk/kernel
465 * that it might know */
466 for (c = 0; c < _UNIT_TYPE_MAX; c++)
467 if (unit_vtable[c]->enumerate)
468 if ((q = unit_vtable[c]->enumerate(m)) < 0)
471 manager_dispatch_load_queue(m);
475 int manager_coldplug(Manager *m) {
483 /* Then, let's set up their initial state. */
484 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
490 if ((q = unit_coldplug(u)) < 0)
497 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
502 /* First, enumerate what we can from all config files */
503 r = manager_enumerate(m);
505 /* Second, deserialize if there is something to deserialize */
507 if ((q = manager_deserialize(m, serialization, fds)) < 0)
510 /* Third, fire things up! */
511 if ((q = manager_coldplug(m)) < 0)
514 /* Now that the initial devices are available, let's see if we
515 * can write the utmp file */
516 manager_write_utmp_reboot(m);
521 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
525 /* Deletes one job from the transaction */
527 manager_transaction_unlink_job(m, j, delete_dependencies);
533 static void transaction_delete_unit(Manager *m, Unit *u) {
536 /* Deletes all jobs associated with a certain unit from the
539 while ((j = hashmap_get(m->transaction_jobs, u)))
540 transaction_delete_job(m, j, true);
543 static void transaction_clean_dependencies(Manager *m) {
549 /* Drops all dependencies of all installed jobs */
551 HASHMAP_FOREACH(j, m->jobs, i) {
552 while (j->subject_list)
553 job_dependency_free(j->subject_list);
554 while (j->object_list)
555 job_dependency_free(j->object_list);
558 assert(!m->transaction_anchor);
561 static void transaction_abort(Manager *m) {
566 while ((j = hashmap_first(m->transaction_jobs)))
568 transaction_delete_job(m, j, true);
572 assert(hashmap_isempty(m->transaction_jobs));
574 transaction_clean_dependencies(m);
577 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
582 /* A recursive sweep through the graph that marks all units
583 * that matter to the anchor job, i.e. are directly or
584 * indirectly a dependency of the anchor job via paths that
585 * are fully marked as mattering. */
590 l = m->transaction_anchor;
592 LIST_FOREACH(subject, l, l) {
594 /* This link does not matter */
598 /* This unit has already been marked */
599 if (l->object->generation == generation)
602 l->object->matters_to_anchor = true;
603 l->object->generation = generation;
605 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
609 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
610 JobDependency *l, *last;
614 assert(j->unit == other->unit);
615 assert(!j->installed);
617 /* Merges 'other' into 'j' and then deletes j. */
620 j->state = JOB_WAITING;
621 j->override = j->override || other->override;
623 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
625 /* Patch us in as new owner of the JobDependency objects */
627 LIST_FOREACH(subject, l, other->subject_list) {
628 assert(l->subject == other);
633 /* Merge both lists */
635 last->subject_next = j->subject_list;
637 j->subject_list->subject_prev = last;
638 j->subject_list = other->subject_list;
641 /* Patch us in as new owner of the JobDependency objects */
643 LIST_FOREACH(object, l, other->object_list) {
644 assert(l->object == other);
649 /* Merge both lists */
651 last->object_next = j->object_list;
653 j->object_list->object_prev = last;
654 j->object_list = other->object_list;
657 /* Kill the other job */
658 other->subject_list = NULL;
659 other->object_list = NULL;
660 transaction_delete_job(m, other, true);
663 static int delete_one_unmergeable_job(Manager *m, Job *j) {
668 /* Tries to delete one item in the linked list
669 * j->transaction_next->transaction_next->... that conflicts
670 * whith another one, in an attempt to make an inconsistent
671 * transaction work. */
673 /* We rely here on the fact that if a merged with b does not
674 * merge with c, either a or b merge with c neither */
675 LIST_FOREACH(transaction, j, j)
676 LIST_FOREACH(transaction, k, j->transaction_next) {
679 /* Is this one mergeable? Then skip it */
680 if (job_type_is_mergeable(j->type, k->type))
683 /* Ok, we found two that conflict, let's see if we can
684 * drop one of them */
685 if (!j->matters_to_anchor)
687 else if (!k->matters_to_anchor)
692 /* Ok, we can drop one, so let's do so. */
693 log_notice("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
694 transaction_delete_job(m, d, true);
701 static int transaction_merge_jobs(Manager *m, DBusError *e) {
708 /* First step, check whether any of the jobs for one specific
709 * task conflict. If so, try to drop one of them. */
710 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
715 LIST_FOREACH(transaction, k, j->transaction_next) {
716 if ((r = job_type_merge(&t, k->type)) >= 0)
719 /* OK, we could not merge all jobs for this
720 * action. Let's see if we can get rid of one
723 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
724 /* Ok, we managed to drop one, now
725 * let's ask our callers to call us
726 * again after garbage collecting */
729 /* We couldn't merge anything. Failure */
730 dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
731 job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
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, DBusError *e) {
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_warning("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_info("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_warning("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_error("Unable to break cycle");
869 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See logs for details.");
873 /* Make the marker point to where we come from, so that we can
874 * find our way backwards if we want to break a cycle. We use
875 * a special marker for the beginning: we point to
877 j->marker = from ? from : j;
878 j->generation = generation;
880 /* We assume that the the dependencies are bidirectional, and
881 * hence can ignore UNIT_AFTER */
882 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
885 /* Is there a job for this unit? */
886 if (!(o = hashmap_get(m->transaction_jobs, u)))
888 /* Ok, there is no job for this in the
889 * transaction, but maybe there is already one
891 if (!(o = u->meta.job))
894 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
898 /* Ok, let's backtrack, and remember that this entry is not on
899 * our path anymore. */
905 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
914 /* Check if the ordering graph is cyclic. If it is, try to fix
915 * that up by dropping one of the jobs. */
919 HASHMAP_FOREACH(j, m->transaction_jobs, i)
920 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
926 static void transaction_collect_garbage(Manager *m) {
931 /* Drop jobs that are not required by any other job */
939 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
943 log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
944 transaction_delete_job(m, j, true);
952 static int transaction_is_destructive(Manager *m, DBusError *e) {
958 /* Checks whether applying this transaction means that
959 * existing jobs would be replaced */
961 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
964 assert(!j->transaction_prev);
965 assert(!j->transaction_next);
967 if (j->unit->meta.job &&
968 j->unit->meta.job != j &&
969 !job_type_is_superset(j->type, j->unit->meta.job->type)) {
971 dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
979 static void transaction_minimize_impact(Manager *m) {
983 /* Drops all unnecessary jobs that reverse already active jobs
984 * or that stop a running service. */
992 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
993 LIST_FOREACH(transaction, j, j) {
994 bool stops_running_service, changes_existing_job;
996 /* If it matters, we shouldn't drop it */
997 if (j->matters_to_anchor)
1000 /* Would this stop a running service?
1001 * Would this change an existing job?
1002 * If so, let's drop this entry */
1004 stops_running_service =
1005 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1007 changes_existing_job =
1008 j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
1010 if (!stops_running_service && !changes_existing_job)
1013 if (stops_running_service)
1014 log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1016 if (changes_existing_job)
1017 log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1019 /* Ok, let's get rid of this */
1020 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1022 transaction_delete_job(m, j, true);
1034 static int transaction_apply(Manager *m) {
1039 /* Moves the transaction jobs to the set of active jobs */
1041 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1043 assert(!j->transaction_prev);
1044 assert(!j->transaction_next);
1049 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1053 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1057 if (j->unit->meta.job)
1058 job_free(j->unit->meta.job);
1060 j->unit->meta.job = j;
1061 j->installed = true;
1063 /* We're fully installed. Now let's free data we don't
1066 assert(!j->transaction_next);
1067 assert(!j->transaction_prev);
1069 job_add_to_run_queue(j);
1070 job_add_to_dbus_queue(j);
1073 /* As last step, kill all remaining job dependencies. */
1074 transaction_clean_dependencies(m);
1080 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1084 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1090 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1092 unsigned generation = 1;
1096 /* This applies the changes recorded in transaction_jobs to
1097 * the actual list of jobs, if possible. */
1099 /* First step: figure out which jobs matter */
1100 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1102 /* Second step: Try not to stop any running services if
1103 * we don't have to. Don't try to reverse running
1104 * jobs if we don't have to. */
1105 transaction_minimize_impact(m);
1107 /* Third step: Drop redundant jobs */
1108 transaction_drop_redundant(m);
1111 /* Fourth step: Let's remove unneeded jobs that might
1113 transaction_collect_garbage(m);
1115 /* Fifth step: verify order makes sense and correct
1116 * cycles if necessary and possible */
1117 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1121 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1125 /* Let's see if the resulting transaction ordering
1126 * graph is still cyclic... */
1130 /* Sixth step: let's drop unmergeable entries if
1131 * necessary and possible, merge entries we can
1133 if ((r = transaction_merge_jobs(m, e)) >= 0)
1137 log_warning("Requested transaction contains unmergable jobs: %s", bus_error(e, r));
1141 /* Seventh step: an entry got dropped, let's garbage
1142 * collect its dependencies. */
1143 transaction_collect_garbage(m);
1145 /* Let's see if the resulting transaction still has
1146 * unmergeable entries ... */
1149 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1150 transaction_drop_redundant(m);
1152 /* Ninth step: check whether we can actually apply this */
1153 if (mode == JOB_FAIL)
1154 if ((r = transaction_is_destructive(m, e)) < 0) {
1155 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1159 /* Tenth step: apply changes */
1160 if ((r = transaction_apply(m)) < 0) {
1161 log_warning("Failed to apply transaction: %s", strerror(-r));
1165 assert(hashmap_isempty(m->transaction_jobs));
1166 assert(!m->transaction_anchor);
1171 transaction_abort(m);
1175 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1182 /* Looks for an axisting prospective job and returns that. If
1183 * it doesn't exist it is created and added to the prospective
1186 f = hashmap_get(m->transaction_jobs, unit);
1188 LIST_FOREACH(transaction, j, f) {
1189 assert(j->unit == unit);
1191 if (j->type == type) {
1198 if (unit->meta.job && unit->meta.job->type == type)
1200 else if (!(j = job_new(m, type, unit)))
1205 j->matters_to_anchor = false;
1206 j->override = override;
1208 LIST_PREPEND(Job, transaction, f, j);
1210 if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1218 log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1223 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1227 if (j->transaction_prev)
1228 j->transaction_prev->transaction_next = j->transaction_next;
1229 else if (j->transaction_next)
1230 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1232 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1234 if (j->transaction_next)
1235 j->transaction_next->transaction_prev = j->transaction_prev;
1237 j->transaction_prev = j->transaction_next = NULL;
1239 while (j->subject_list)
1240 job_dependency_free(j->subject_list);
1242 while (j->object_list) {
1243 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1245 job_dependency_free(j->object_list);
1247 if (other && delete_dependencies) {
1248 log_info("Deleting job %s/%s as dependency of job %s/%s",
1249 other->unit->meta.id, job_type_to_string(other->type),
1250 j->unit->meta.id, job_type_to_string(j->type));
1251 transaction_delete_job(m, other, delete_dependencies);
1256 static int transaction_add_job_and_dependencies(
1272 assert(type < _JOB_TYPE_MAX);
1275 if (unit->meta.load_state != UNIT_LOADED) {
1276 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s failed to load. See logs for details.", unit->meta.id);
1280 if (!unit_job_is_applicable(unit, type)) {
1281 dbus_set_error(e, BUS_ERROR_JOB_TYPE_NOT_APPLICABLE, "Job type %s is not applicable for unit %s.", job_type_to_string(type), unit->meta.id);
1285 /* First add the job. */
1286 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1289 /* Then, add a link to the job. */
1290 if (!job_dependency_new(by, ret, matters))
1294 /* Finally, recursively add in all dependencies. */
1295 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1296 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1297 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
1300 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1301 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, e, 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_WANTS], i)
1305 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, e, NULL)) < 0)
1306 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1308 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1309 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
1312 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1313 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, e, NULL)) < 0 && r != -EBADR)
1314 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1316 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1317 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
1320 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1322 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1323 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
1327 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1339 static int transaction_add_isolate_jobs(Manager *m) {
1347 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1349 /* ignore aliases */
1350 if (u->meta.id != k)
1353 if (UNIT_VTABLE(u)->no_isolate)
1356 /* No need to stop inactive jobs */
1357 if (UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(u)))
1360 /* Is there already something listed for this? */
1361 if (hashmap_get(m->transaction_jobs, u))
1364 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL, NULL)) < 0)
1365 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1371 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1376 assert(type < _JOB_TYPE_MAX);
1378 assert(mode < _JOB_MODE_MAX);
1380 if (mode == JOB_ISOLATE && type != JOB_START) {
1381 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1385 log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
1387 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, e, &ret)) < 0) {
1388 transaction_abort(m);
1392 if (mode == JOB_ISOLATE)
1393 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1394 transaction_abort(m);
1398 if ((r = transaction_activate(m, mode, e)) < 0)
1401 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1409 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1414 assert(type < _JOB_TYPE_MAX);
1416 assert(mode < _JOB_MODE_MAX);
1418 if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1421 return manager_add_job(m, type, unit, mode, override, e, _ret);
1424 Job *manager_get_job(Manager *m, uint32_t id) {
1427 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1430 Unit *manager_get_unit(Manager *m, const char *name) {
1434 return hashmap_get(m->units, name);
1437 unsigned manager_dispatch_load_queue(Manager *m) {
1443 /* Make sure we are not run recursively */
1444 if (m->dispatching_load_queue)
1447 m->dispatching_load_queue = true;
1449 /* Dispatches the load queue. Takes a unit from the queue and
1450 * tries to load its data until the queue is empty */
1452 while ((meta = m->load_queue)) {
1453 assert(meta->in_load_queue);
1455 unit_load((Unit*) meta);
1459 m->dispatching_load_queue = false;
1463 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1468 assert(name || path);
1470 /* This will prepare the unit for loading, but not actually
1471 * load anything from disk. */
1473 if (path && !is_path(path)) {
1474 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1479 name = file_name_from_path(path);
1481 if (!unit_name_is_valid(name)) {
1482 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1486 if ((ret = manager_get_unit(m, name))) {
1491 if (!(ret = unit_new(m)))
1495 if (!(ret->meta.fragment_path = strdup(path))) {
1500 if ((r = unit_add_name(ret, name)) < 0) {
1505 unit_add_to_load_queue(ret);
1506 unit_add_to_dbus_queue(ret);
1507 unit_add_to_gc_queue(ret);
1515 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1520 /* This will load the service information files, but not actually
1521 * start any services or anything. */
1523 if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1526 manager_dispatch_load_queue(m);
1529 *_ret = unit_follow_merge(*_ret);
1534 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1541 HASHMAP_FOREACH(j, s->jobs, i)
1542 job_dump(j, f, prefix);
1545 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1553 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1554 if (u->meta.id == t)
1555 unit_dump(u, f, prefix);
1558 void manager_clear_jobs(Manager *m) {
1563 transaction_abort(m);
1565 while ((j = hashmap_first(m->jobs)))
1569 unsigned manager_dispatch_run_queue(Manager *m) {
1573 if (m->dispatching_run_queue)
1576 m->dispatching_run_queue = true;
1578 while ((j = m->run_queue)) {
1579 assert(j->installed);
1580 assert(j->in_run_queue);
1582 job_run_and_invalidate(j);
1586 m->dispatching_run_queue = false;
1590 unsigned manager_dispatch_dbus_queue(Manager *m) {
1597 if (m->dispatching_dbus_queue)
1600 m->dispatching_dbus_queue = true;
1602 while ((meta = m->dbus_unit_queue)) {
1603 assert(meta->in_dbus_queue);
1605 bus_unit_send_change_signal((Unit*) meta);
1609 while ((j = m->dbus_job_queue)) {
1610 assert(j->in_dbus_queue);
1612 bus_job_send_change_signal(j);
1616 m->dispatching_dbus_queue = false;
1620 static int manager_process_notify_fd(Manager *m) {
1627 struct msghdr msghdr;
1629 struct ucred *ucred;
1631 struct cmsghdr cmsghdr;
1632 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1638 iovec.iov_base = buf;
1639 iovec.iov_len = sizeof(buf)-1;
1643 msghdr.msg_iov = &iovec;
1644 msghdr.msg_iovlen = 1;
1645 msghdr.msg_control = &control;
1646 msghdr.msg_controllen = sizeof(control);
1648 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1652 if (errno == EAGAIN)
1658 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1659 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1660 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1661 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1662 log_warning("Received notify message without credentials. Ignoring.");
1666 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1668 if (!(u = hashmap_get(m->watch_pids, UINT32_TO_PTR(ucred->pid))))
1669 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1670 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1674 assert((size_t) n < sizeof(buf));
1676 if (!(tags = strv_split(buf, "\n\r")))
1679 log_debug("Got notification message for unit %s", u->meta.id);
1681 if (UNIT_VTABLE(u)->notify_message)
1682 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1690 static int manager_dispatch_sigchld(Manager *m) {
1700 /* First we call waitd() for a PID and do not reap the
1701 * zombie. That way we can still access /proc/$PID for
1702 * it while it is a zombie. */
1703 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1705 if (errno == ECHILD)
1717 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1720 get_process_name(si.si_pid, &name);
1721 log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1725 /* Let's flush any message the dying child might still
1726 * have queued for us. This ensures that the process
1727 * still exists in /proc so that we can figure out
1728 * which cgroup and hence unit it belongs to. */
1729 if ((r = manager_process_notify_fd(m)) < 0)
1732 /* And now figure out the unit this belongs to */
1733 if (!(u = hashmap_get(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
1734 u = cgroup_unit_by_pid(m, si.si_pid);
1736 /* And now, we actually reap the zombie. */
1737 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1744 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1747 log_debug("Child %lu died (code=%s, status=%i/%s)",
1748 (long unsigned) si.si_pid,
1749 sigchld_code_to_string(si.si_code),
1751 strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
1756 log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
1758 hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid));
1759 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1765 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
1769 dbus_error_init(&error);
1771 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
1772 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
1774 dbus_error_free(&error);
1779 static int manager_process_signal_fd(Manager *m) {
1781 struct signalfd_siginfo sfsi;
1782 bool sigchld = false;
1787 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1792 if (errno == EAGAIN)
1798 switch (sfsi.ssi_signo) {
1805 if (m->running_as == MANAGER_SYSTEM) {
1806 /* This is for compatibility with the
1807 * original sysvinit */
1808 m->exit_code = MANAGER_REEXECUTE;
1815 if (m->running_as == MANAGER_SYSTEM) {
1816 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
1820 /* Run the exit target if there is one, if not, just exit. */
1821 if (manager_start_target(m, SPECIAL_EXIT_SERVICE, JOB_REPLACE) < 0) {
1822 m->exit_code = MANAGER_EXIT;
1829 if (m->running_as == MANAGER_SYSTEM)
1830 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
1832 /* This is a nop on non-init */
1836 if (m->running_as == MANAGER_SYSTEM)
1837 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
1839 /* This is a nop on non-init */
1845 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1847 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
1848 log_info("Trying to reconnect to bus...");
1852 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
1853 log_info("Loading D-Bus service...");
1854 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
1865 if (!(f = open_memstream(&dump, &size))) {
1866 log_warning("Failed to allocate memory stream.");
1870 manager_dump_units(m, f, "\t");
1871 manager_dump_jobs(m, f, "\t");
1876 log_warning("Failed to write status stream");
1881 log_dump(LOG_INFO, dump);
1888 m->exit_code = MANAGER_RELOAD;
1892 static const char * const table[] = {
1893 [0] = SPECIAL_DEFAULT_TARGET,
1894 [1] = SPECIAL_RESCUE_TARGET,
1895 [2] = SPECIAL_EMERGENCY_SERVICE,
1896 [3] = SPECIAL_HALT_TARGET,
1897 [4] = SPECIAL_POWEROFF_TARGET,
1898 [5] = SPECIAL_REBOOT_TARGET
1901 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
1902 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(table)) {
1903 manager_start_target(m, table[sfsi.ssi_signo - SIGRTMIN],
1904 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
1908 log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
1914 return manager_dispatch_sigchld(m);
1919 static int process_event(Manager *m, struct epoll_event *ev) {
1926 assert(w = ev->data.ptr);
1932 /* An incoming signal? */
1933 if (ev->events != EPOLLIN)
1936 if ((r = manager_process_signal_fd(m)) < 0)
1943 /* An incoming daemon notification event? */
1944 if (ev->events != EPOLLIN)
1947 if ((r = manager_process_notify_fd(m)) < 0)
1954 /* Some fd event, to be dispatched to the units */
1955 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1962 /* Some timer event, to be dispatched to the units */
1963 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1965 if (k < 0 && (errno == EINTR || errno == EAGAIN))
1968 return k < 0 ? -errno : -EIO;
1971 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1976 /* Some mount table change, intended for the mount subsystem */
1977 mount_fd_event(m, ev->events);
1981 /* Some notification from udev, intended for the device subsystem */
1982 device_fd_event(m, ev->events);
1985 case WATCH_DBUS_WATCH:
1986 bus_watch_event(m, w, ev->events);
1989 case WATCH_DBUS_TIMEOUT:
1990 bus_timeout_event(m, w, ev->events);
1994 assert_not_reached("Unknown epoll event type.");
2000 int manager_loop(Manager *m) {
2003 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
2006 m->exit_code = MANAGER_RUNNING;
2008 /* There might still be some zombies hanging around from
2009 * before we were exec()'ed. Leat's reap them */
2010 if ((r = manager_dispatch_sigchld(m)) < 0)
2013 while (m->exit_code == MANAGER_RUNNING) {
2014 struct epoll_event event;
2017 if (!ratelimit_test(&rl)) {
2018 /* Yay, something is going seriously wrong, pause a little */
2019 log_warning("Looping too fast. Throttling execution a little.");
2023 if (manager_dispatch_load_queue(m) > 0)
2026 if (manager_dispatch_run_queue(m) > 0)
2029 if (bus_dispatch(m) > 0)
2032 if (manager_dispatch_cleanup_queue(m) > 0)
2035 if (manager_dispatch_gc_queue(m) > 0)
2038 if (manager_dispatch_dbus_queue(m) > 0)
2041 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2051 if ((r = process_event(m, &event)) < 0)
2055 return m->exit_code;
2058 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2066 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2069 if (!(n = bus_path_unescape(s+31)))
2072 u = manager_get_unit(m, n);
2083 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2092 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2095 if ((r = safe_atou(s + 30, &id)) < 0)
2098 if (!(j = manager_get_job(m, id)))
2106 static bool manager_utmp_good(Manager *m) {
2111 if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
2114 log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
2122 void manager_write_utmp_reboot(Manager *m) {
2127 if (m->utmp_reboot_written)
2130 if (m->running_as != MANAGER_SYSTEM)
2133 if (!manager_utmp_good(m))
2136 if ((r = utmp_put_reboot(m->startup_timestamp.realtime)) < 0) {
2138 if (r != -ENOENT && r != -EROFS)
2139 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2144 m->utmp_reboot_written = true;
2147 void manager_write_utmp_runlevel(Manager *m, Unit *u) {
2153 if (u->meta.type != UNIT_TARGET)
2156 if (m->running_as != MANAGER_SYSTEM)
2159 if (!manager_utmp_good(m))
2162 if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
2165 if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
2167 if (r != -ENOENT && r != -EROFS)
2168 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2172 void manager_dispatch_bus_name_owner_changed(
2175 const char* old_owner,
2176 const char *new_owner) {
2183 if (!(u = hashmap_get(m->watch_bus, name)))
2186 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2189 void manager_dispatch_bus_query_pid_done(
2200 if (!(u = hashmap_get(m->watch_bus, name)))
2203 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2206 int manager_open_serialization(FILE **_f) {
2214 if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2217 saved_umask = umask(0077);
2218 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2228 log_debug("Serializing state to %s", path);
2231 if (!(f = fdopen(fd, "w+")) < 0)
2239 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2249 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2250 if (u->meta.id != t)
2253 if (!unit_can_serialize(u))
2257 fputs(u->meta.id, f);
2260 if ((r = unit_serialize(u, f, fds)) < 0)
2270 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2276 log_debug("Deserializing state...");
2280 char name[UNIT_NAME_MAX+2];
2283 if (!fgets(name, sizeof(name), f)) {
2292 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2295 if ((r = unit_deserialize(u, f, fds)) < 0)
2305 int manager_reload(Manager *m) {
2312 if ((r = manager_open_serialization(&f)) < 0)
2315 if (!(fds = fdset_new())) {
2320 if ((r = manager_serialize(m, f, fds)) < 0)
2323 if (fseeko(f, 0, SEEK_SET) < 0) {
2328 /* From here on there is no way back. */
2329 manager_clear_jobs_and_units(m);
2331 /* Find new unit paths */
2332 lookup_paths_free(&m->lookup_paths);
2333 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2336 /* First, enumerate what we can from all config files */
2337 if ((q = manager_enumerate(m)) < 0)
2340 /* Second, deserialize our stored data */
2341 if ((q = manager_deserialize(m, f, fds)) < 0)
2347 /* Third, fire things up! */
2348 if ((q = manager_coldplug(m)) < 0)
2361 bool manager_is_booting_or_shutting_down(Manager *m) {
2366 /* Is the initial job still around? */
2367 if (manager_get_job(m, 1))
2370 /* Is there a job for the shutdown target? */
2371 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2372 return !!u->meta.job;
2377 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2378 [MANAGER_SYSTEM] = "system",
2379 [MANAGER_SESSION] = "session"
2382 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);