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;
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) {
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)
255 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
261 while ((meta = m->cleanup_queue)) {
262 assert(meta->in_cleanup_queue);
264 unit_free((Unit*) meta);
272 GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */
273 GC_OFFSET_UNSURE, /* No clue */
274 GC_OFFSET_GOOD, /* We still need this unit */
275 GC_OFFSET_BAD, /* We don't need this unit anymore */
279 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
286 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
287 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
288 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
291 if (u->meta.in_cleanup_queue)
294 if (unit_check_gc(u))
297 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
301 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
302 unit_gc_sweep(other, gc_marker);
304 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
307 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
314 /* We were unable to find anything out about this entry, so
315 * let's investigate it later */
316 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
317 unit_add_to_gc_queue(u);
321 /* We definitely know that this one is not useful anymore, so
322 * let's mark it for deletion */
323 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
324 unit_add_to_cleanup_queue(u);
328 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
331 static unsigned manager_dispatch_gc_queue(Manager *m) {
338 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
339 (m->gc_queue_timestamp <= 0 ||
340 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
343 log_debug("Running GC...");
345 m->gc_marker += _GC_OFFSET_MAX;
346 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
349 gc_marker = m->gc_marker;
351 while ((meta = m->gc_queue)) {
352 assert(meta->in_gc_queue);
354 unit_gc_sweep((Unit*) meta, gc_marker);
356 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
357 meta->in_gc_queue = false;
361 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
362 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
363 log_debug("Collecting %s", meta->id);
364 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
365 unit_add_to_cleanup_queue((Unit*) meta);
369 m->n_in_gc_queue = 0;
370 m->gc_queue_timestamp = 0;
375 static void manager_clear_jobs_and_units(Manager *m) {
381 while ((j = hashmap_first(m->transaction_jobs)))
384 while ((u = hashmap_first(m->units)))
387 manager_dispatch_cleanup_queue(m);
389 assert(!m->load_queue);
390 assert(!m->run_queue);
391 assert(!m->dbus_unit_queue);
392 assert(!m->dbus_job_queue);
393 assert(!m->cleanup_queue);
394 assert(!m->gc_queue);
396 assert(hashmap_isempty(m->transaction_jobs));
397 assert(hashmap_isempty(m->jobs));
398 assert(hashmap_isempty(m->units));
401 void manager_free(Manager *m) {
406 manager_clear_jobs_and_units(m);
408 for (c = 0; c < _UNIT_TYPE_MAX; c++)
409 if (unit_vtable[c]->shutdown)
410 unit_vtable[c]->shutdown(m);
412 /* If we reexecute ourselves, we keep the root cgroup
414 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
418 hashmap_free(m->units);
419 hashmap_free(m->jobs);
420 hashmap_free(m->transaction_jobs);
421 hashmap_free(m->watch_pids);
422 hashmap_free(m->watch_bus);
424 if (m->epoll_fd >= 0)
425 close_nointr_nofail(m->epoll_fd);
426 if (m->signal_watch.fd >= 0)
427 close_nointr_nofail(m->signal_watch.fd);
428 if (m->notify_watch.fd >= 0)
429 close_nointr_nofail(m->notify_watch.fd);
431 free(m->notify_socket);
433 lookup_paths_free(&m->lookup_paths);
434 strv_free(m->environment);
436 hashmap_free(m->cgroup_bondings);
437 set_free_free(m->unit_path_cache);
442 int manager_enumerate(Manager *m) {
448 /* Let's ask every type to load all units from disk/kernel
449 * that it might know */
450 for (c = 0; c < _UNIT_TYPE_MAX; c++)
451 if (unit_vtable[c]->enumerate)
452 if ((q = unit_vtable[c]->enumerate(m)) < 0)
455 manager_dispatch_load_queue(m);
459 int manager_coldplug(Manager *m) {
467 /* Then, let's set up their initial state. */
468 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
474 if ((q = unit_coldplug(u)) < 0)
481 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
486 /* First, enumerate what we can from all config files */
487 r = manager_enumerate(m);
489 /* Second, deserialize if there is something to deserialize */
491 if ((q = manager_deserialize(m, serialization, fds)) < 0)
494 /* Third, fire things up! */
495 if ((q = manager_coldplug(m)) < 0)
498 /* Now that the initial devices are available, let's see if we
499 * can write the utmp file */
500 manager_write_utmp_reboot(m);
505 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
509 /* Deletes one job from the transaction */
511 manager_transaction_unlink_job(m, j, delete_dependencies);
517 static void transaction_delete_unit(Manager *m, Unit *u) {
520 /* Deletes all jobs associated with a certain unit from the
523 while ((j = hashmap_get(m->transaction_jobs, u)))
524 transaction_delete_job(m, j, true);
527 static void transaction_clean_dependencies(Manager *m) {
533 /* Drops all dependencies of all installed jobs */
535 HASHMAP_FOREACH(j, m->jobs, i) {
536 while (j->subject_list)
537 job_dependency_free(j->subject_list);
538 while (j->object_list)
539 job_dependency_free(j->object_list);
542 assert(!m->transaction_anchor);
545 static void transaction_abort(Manager *m) {
550 while ((j = hashmap_first(m->transaction_jobs)))
552 transaction_delete_job(m, j, true);
556 assert(hashmap_isempty(m->transaction_jobs));
558 transaction_clean_dependencies(m);
561 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
566 /* A recursive sweep through the graph that marks all units
567 * that matter to the anchor job, i.e. are directly or
568 * indirectly a dependency of the anchor job via paths that
569 * are fully marked as mattering. */
574 l = m->transaction_anchor;
576 LIST_FOREACH(subject, l, l) {
578 /* This link does not matter */
582 /* This unit has already been marked */
583 if (l->object->generation == generation)
586 l->object->matters_to_anchor = true;
587 l->object->generation = generation;
589 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
593 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
594 JobDependency *l, *last;
598 assert(j->unit == other->unit);
599 assert(!j->installed);
601 /* Merges 'other' into 'j' and then deletes j. */
604 j->state = JOB_WAITING;
605 j->override = j->override || other->override;
607 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
609 /* Patch us in as new owner of the JobDependency objects */
611 LIST_FOREACH(subject, l, other->subject_list) {
612 assert(l->subject == other);
617 /* Merge both lists */
619 last->subject_next = j->subject_list;
621 j->subject_list->subject_prev = last;
622 j->subject_list = other->subject_list;
625 /* Patch us in as new owner of the JobDependency objects */
627 LIST_FOREACH(object, l, other->object_list) {
628 assert(l->object == other);
633 /* Merge both lists */
635 last->object_next = j->object_list;
637 j->object_list->object_prev = last;
638 j->object_list = other->object_list;
641 /* Kill the other job */
642 other->subject_list = NULL;
643 other->object_list = NULL;
644 transaction_delete_job(m, other, true);
647 static int delete_one_unmergeable_job(Manager *m, Job *j) {
652 /* Tries to delete one item in the linked list
653 * j->transaction_next->transaction_next->... that conflicts
654 * whith another one, in an attempt to make an inconsistent
655 * transaction work. */
657 /* We rely here on the fact that if a merged with b does not
658 * merge with c, either a or b merge with c neither */
659 LIST_FOREACH(transaction, j, j)
660 LIST_FOREACH(transaction, k, j->transaction_next) {
663 /* Is this one mergeable? Then skip it */
664 if (job_type_is_mergeable(j->type, k->type))
667 /* Ok, we found two that conflict, let's see if we can
668 * drop one of them */
669 if (!j->matters_to_anchor)
671 else if (!k->matters_to_anchor)
676 /* Ok, we can drop one, so let's do so. */
677 log_notice("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
678 transaction_delete_job(m, d, true);
685 static int transaction_merge_jobs(Manager *m, DBusError *e) {
692 /* First step, check whether any of the jobs for one specific
693 * task conflict. If so, try to drop one of them. */
694 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
699 LIST_FOREACH(transaction, k, j->transaction_next) {
700 if ((r = job_type_merge(&t, k->type)) >= 0)
703 /* OK, we could not merge all jobs for this
704 * action. Let's see if we can get rid of one
707 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
708 /* Ok, we managed to drop one, now
709 * let's ask our callers to call us
710 * again after garbage collecting */
713 /* We couldn't merge anything. Failure */
714 dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
715 job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
720 /* Second step, merge the jobs. */
721 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
725 /* Merge all transactions */
726 LIST_FOREACH(transaction, k, j->transaction_next)
727 assert_se(job_type_merge(&t, k->type) == 0);
729 /* If an active job is mergeable, merge it too */
730 if (j->unit->meta.job)
731 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
733 while ((k = j->transaction_next)) {
735 transaction_merge_and_delete_job(m, k, j, t);
738 transaction_merge_and_delete_job(m, j, k, t);
741 assert(!j->transaction_next);
742 assert(!j->transaction_prev);
748 static void transaction_drop_redundant(Manager *m) {
753 /* Goes through the transaction and removes all jobs that are
762 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
763 bool changes_something = false;
766 LIST_FOREACH(transaction, k, j) {
768 if (!job_is_anchor(k) &&
769 job_type_is_redundant(k->type, unit_active_state(k->unit)))
772 changes_something = true;
776 if (changes_something)
779 log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
780 transaction_delete_job(m, j, false);
788 static bool unit_matters_to_anchor(Unit *u, Job *j) {
790 assert(!j->transaction_prev);
792 /* Checks whether at least one of the jobs for this unit
793 * matters to the anchor. */
795 LIST_FOREACH(transaction, j, j)
796 if (j->matters_to_anchor)
802 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
809 assert(!j->transaction_prev);
811 /* Does a recursive sweep through the ordering graph, looking
812 * for a cycle. If we find cycle we try to break it. */
814 /* Have we seen this before? */
815 if (j->generation == generation) {
818 /* If the marker is NULL we have been here already and
819 * decided the job was loop-free from here. Hence
820 * shortcut things and return right-away. */
824 /* So, the marker is not NULL and we already have been
825 * here. We have a cycle. Let's try to break it. We go
826 * backwards in our path and try to find a suitable
827 * job to remove. We use the marker to find our way
828 * back, since smart how we are we stored our way back
830 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
832 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
834 log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
837 !unit_matters_to_anchor(k->unit, k)) {
838 /* Ok, we can drop this one, so let's
840 log_warning("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
841 transaction_delete_unit(m, k->unit);
845 /* Check if this in fact was the beginning of
851 log_error("Unable to break cycle");
853 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See logs for details.");
857 /* Make the marker point to where we come from, so that we can
858 * find our way backwards if we want to break a cycle. We use
859 * a special marker for the beginning: we point to
861 j->marker = from ? from : j;
862 j->generation = generation;
864 /* We assume that the the dependencies are bidirectional, and
865 * hence can ignore UNIT_AFTER */
866 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
869 /* Is there a job for this unit? */
870 if (!(o = hashmap_get(m->transaction_jobs, u)))
872 /* Ok, there is no job for this in the
873 * transaction, but maybe there is already one
875 if (!(o = u->meta.job))
878 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
882 /* Ok, let's backtrack, and remember that this entry is not on
883 * our path anymore. */
889 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
898 /* Check if the ordering graph is cyclic. If it is, try to fix
899 * that up by dropping one of the jobs. */
903 HASHMAP_FOREACH(j, m->transaction_jobs, i)
904 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
910 static void transaction_collect_garbage(Manager *m) {
915 /* Drop jobs that are not required by any other job */
923 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
927 log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
928 transaction_delete_job(m, j, true);
936 static int transaction_is_destructive(Manager *m, DBusError *e) {
942 /* Checks whether applying this transaction means that
943 * existing jobs would be replaced */
945 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
948 assert(!j->transaction_prev);
949 assert(!j->transaction_next);
951 if (j->unit->meta.job &&
952 j->unit->meta.job != j &&
953 !job_type_is_superset(j->type, j->unit->meta.job->type)) {
955 dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
963 static void transaction_minimize_impact(Manager *m) {
967 /* Drops all unnecessary jobs that reverse already active jobs
968 * or that stop a running service. */
976 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
977 LIST_FOREACH(transaction, j, j) {
978 bool stops_running_service, changes_existing_job;
980 /* If it matters, we shouldn't drop it */
981 if (j->matters_to_anchor)
984 /* Would this stop a running service?
985 * Would this change an existing job?
986 * If so, let's drop this entry */
988 stops_running_service =
989 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
991 changes_existing_job =
992 j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
994 if (!stops_running_service && !changes_existing_job)
997 if (stops_running_service)
998 log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1000 if (changes_existing_job)
1001 log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1003 /* Ok, let's get rid of this */
1004 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1006 transaction_delete_job(m, j, true);
1018 static int transaction_apply(Manager *m) {
1023 /* Moves the transaction jobs to the set of active jobs */
1025 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1027 assert(!j->transaction_prev);
1028 assert(!j->transaction_next);
1033 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1037 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1041 if (j->unit->meta.job)
1042 job_free(j->unit->meta.job);
1044 j->unit->meta.job = j;
1045 j->installed = true;
1047 /* We're fully installed. Now let's free data we don't
1050 assert(!j->transaction_next);
1051 assert(!j->transaction_prev);
1053 job_add_to_run_queue(j);
1054 job_add_to_dbus_queue(j);
1057 /* As last step, kill all remaining job dependencies. */
1058 transaction_clean_dependencies(m);
1064 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1068 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1074 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1076 unsigned generation = 1;
1080 /* This applies the changes recorded in transaction_jobs to
1081 * the actual list of jobs, if possible. */
1083 /* First step: figure out which jobs matter */
1084 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1086 /* Second step: Try not to stop any running services if
1087 * we don't have to. Don't try to reverse running
1088 * jobs if we don't have to. */
1089 transaction_minimize_impact(m);
1091 /* Third step: Drop redundant jobs */
1092 transaction_drop_redundant(m);
1095 /* Fourth step: Let's remove unneeded jobs that might
1097 transaction_collect_garbage(m);
1099 /* Fifth step: verify order makes sense and correct
1100 * cycles if necessary and possible */
1101 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1105 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1109 /* Let's see if the resulting transaction ordering
1110 * graph is still cyclic... */
1114 /* Sixth step: let's drop unmergeable entries if
1115 * necessary and possible, merge entries we can
1117 if ((r = transaction_merge_jobs(m, e)) >= 0)
1121 log_warning("Requested transaction contains unmergable jobs: %s", bus_error(e, r));
1125 /* Seventh step: an entry got dropped, let's garbage
1126 * collect its dependencies. */
1127 transaction_collect_garbage(m);
1129 /* Let's see if the resulting transaction still has
1130 * unmergeable entries ... */
1133 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1134 transaction_drop_redundant(m);
1136 /* Ninth step: check whether we can actually apply this */
1137 if (mode == JOB_FAIL)
1138 if ((r = transaction_is_destructive(m, e)) < 0) {
1139 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1143 /* Tenth step: apply changes */
1144 if ((r = transaction_apply(m)) < 0) {
1145 log_warning("Failed to apply transaction: %s", strerror(-r));
1149 assert(hashmap_isempty(m->transaction_jobs));
1150 assert(!m->transaction_anchor);
1155 transaction_abort(m);
1159 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1166 /* Looks for an axisting prospective job and returns that. If
1167 * it doesn't exist it is created and added to the prospective
1170 f = hashmap_get(m->transaction_jobs, unit);
1172 LIST_FOREACH(transaction, j, f) {
1173 assert(j->unit == unit);
1175 if (j->type == type) {
1182 if (unit->meta.job && unit->meta.job->type == type)
1184 else if (!(j = job_new(m, type, unit)))
1189 j->matters_to_anchor = false;
1190 j->override = override;
1192 LIST_PREPEND(Job, transaction, f, j);
1194 if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1202 log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1207 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1211 if (j->transaction_prev)
1212 j->transaction_prev->transaction_next = j->transaction_next;
1213 else if (j->transaction_next)
1214 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1216 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1218 if (j->transaction_next)
1219 j->transaction_next->transaction_prev = j->transaction_prev;
1221 j->transaction_prev = j->transaction_next = NULL;
1223 while (j->subject_list)
1224 job_dependency_free(j->subject_list);
1226 while (j->object_list) {
1227 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1229 job_dependency_free(j->object_list);
1231 if (other && delete_dependencies) {
1232 log_info("Deleting job %s/%s as dependency of job %s/%s",
1233 other->unit->meta.id, job_type_to_string(other->type),
1234 j->unit->meta.id, job_type_to_string(j->type));
1235 transaction_delete_job(m, other, delete_dependencies);
1240 static int transaction_add_job_and_dependencies(
1256 assert(type < _JOB_TYPE_MAX);
1259 if (unit->meta.load_state != UNIT_LOADED) {
1260 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s failed to load. See logs for details.", unit->meta.id);
1264 if (!unit_job_is_applicable(unit, type)) {
1265 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);
1269 /* First add the job. */
1270 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1273 /* Then, add a link to the job. */
1274 if (!job_dependency_new(by, ret, matters))
1278 /* Finally, recursively add in all dependencies. */
1279 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1280 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1281 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
1284 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1285 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, e, NULL)) < 0 && r != -EBADR)
1286 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1288 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1289 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, e, NULL)) < 0)
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_REQUISITE], i)
1293 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
1296 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1297 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, e, NULL)) < 0 && r != -EBADR)
1298 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1300 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1301 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
1304 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1306 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1307 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, e, NULL)) < 0 && r != -EBADR)
1311 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1323 static int transaction_add_isolate_jobs(Manager *m) {
1331 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1333 /* ignore aliases */
1334 if (u->meta.id != k)
1337 if (UNIT_VTABLE(u)->no_isolate)
1340 /* No need to stop inactive jobs */
1341 if (UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(u)))
1344 /* Is there already something listed for this? */
1345 if (hashmap_get(m->transaction_jobs, u))
1348 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL, NULL)) < 0)
1349 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1355 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1360 assert(type < _JOB_TYPE_MAX);
1362 assert(mode < _JOB_MODE_MAX);
1364 if (mode == JOB_ISOLATE && type != JOB_START) {
1365 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1369 log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
1371 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, e, &ret)) < 0) {
1372 transaction_abort(m);
1376 if (mode == JOB_ISOLATE)
1377 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1378 transaction_abort(m);
1382 if ((r = transaction_activate(m, mode, e)) < 0)
1385 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1393 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1398 assert(type < _JOB_TYPE_MAX);
1400 assert(mode < _JOB_MODE_MAX);
1402 if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1405 return manager_add_job(m, type, unit, mode, override, e, _ret);
1408 Job *manager_get_job(Manager *m, uint32_t id) {
1411 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1414 Unit *manager_get_unit(Manager *m, const char *name) {
1418 return hashmap_get(m->units, name);
1421 unsigned manager_dispatch_load_queue(Manager *m) {
1427 /* Make sure we are not run recursively */
1428 if (m->dispatching_load_queue)
1431 m->dispatching_load_queue = true;
1433 /* Dispatches the load queue. Takes a unit from the queue and
1434 * tries to load its data until the queue is empty */
1436 while ((meta = m->load_queue)) {
1437 assert(meta->in_load_queue);
1439 unit_load((Unit*) meta);
1443 m->dispatching_load_queue = false;
1447 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1452 assert(name || path);
1454 /* This will prepare the unit for loading, but not actually
1455 * load anything from disk. */
1457 if (path && !is_path(path)) {
1458 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1463 name = file_name_from_path(path);
1465 if (!unit_name_is_valid(name)) {
1466 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1470 if ((ret = manager_get_unit(m, name))) {
1475 if (!(ret = unit_new(m)))
1479 if (!(ret->meta.fragment_path = strdup(path))) {
1484 if ((r = unit_add_name(ret, name)) < 0) {
1489 unit_add_to_load_queue(ret);
1490 unit_add_to_dbus_queue(ret);
1491 unit_add_to_gc_queue(ret);
1499 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1504 /* This will load the service information files, but not actually
1505 * start any services or anything. */
1507 if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1510 manager_dispatch_load_queue(m);
1513 *_ret = unit_follow_merge(*_ret);
1518 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1525 HASHMAP_FOREACH(j, s->jobs, i)
1526 job_dump(j, f, prefix);
1529 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1537 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1538 if (u->meta.id == t)
1539 unit_dump(u, f, prefix);
1542 void manager_clear_jobs(Manager *m) {
1547 transaction_abort(m);
1549 while ((j = hashmap_first(m->jobs)))
1553 unsigned manager_dispatch_run_queue(Manager *m) {
1557 if (m->dispatching_run_queue)
1560 m->dispatching_run_queue = true;
1562 while ((j = m->run_queue)) {
1563 assert(j->installed);
1564 assert(j->in_run_queue);
1566 job_run_and_invalidate(j);
1570 m->dispatching_run_queue = false;
1574 unsigned manager_dispatch_dbus_queue(Manager *m) {
1581 if (m->dispatching_dbus_queue)
1584 m->dispatching_dbus_queue = true;
1586 while ((meta = m->dbus_unit_queue)) {
1587 assert(meta->in_dbus_queue);
1589 bus_unit_send_change_signal((Unit*) meta);
1593 while ((j = m->dbus_job_queue)) {
1594 assert(j->in_dbus_queue);
1596 bus_job_send_change_signal(j);
1600 m->dispatching_dbus_queue = false;
1604 static int manager_process_notify_fd(Manager *m) {
1611 struct msghdr msghdr;
1613 struct ucred *ucred;
1615 struct cmsghdr cmsghdr;
1616 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1622 iovec.iov_base = buf;
1623 iovec.iov_len = sizeof(buf)-1;
1627 msghdr.msg_iov = &iovec;
1628 msghdr.msg_iovlen = 1;
1629 msghdr.msg_control = &control;
1630 msghdr.msg_controllen = sizeof(control);
1632 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1636 if (errno == EAGAIN)
1642 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1643 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1644 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1645 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1646 log_warning("Received notify message without credentials. Ignoring.");
1650 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1652 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1653 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1654 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1658 assert((size_t) n < sizeof(buf));
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 %lu (%s)", (unsigned 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, LONG_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 %lu died (code=%s, status=%i/%s)",
1732 (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) : signal_to_string(si.si_status)));
1740 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
1742 hashmap_remove(m->watch_pids, LONG_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) {
1753 dbus_error_init(&error);
1755 log_info("Activating special unit %s", name);
1757 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
1758 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
1760 dbus_error_free(&error);
1765 static int manager_process_signal_fd(Manager *m) {
1767 struct signalfd_siginfo sfsi;
1768 bool sigchld = false;
1773 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1778 if (errno == EAGAIN)
1784 log_debug("Received SIG%s", strna(signal_to_string(sfsi.ssi_signo)));
1786 switch (sfsi.ssi_signo) {
1793 if (m->running_as == MANAGER_SYSTEM) {
1794 /* This is for compatibility with the
1795 * original sysvinit */
1796 m->exit_code = MANAGER_REEXECUTE;
1803 if (m->running_as == MANAGER_SYSTEM) {
1804 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
1808 /* Run the exit target if there is one, if not, just exit. */
1809 if (manager_start_target(m, SPECIAL_EXIT_SERVICE, JOB_REPLACE) < 0) {
1810 m->exit_code = MANAGER_EXIT;
1817 if (m->running_as == MANAGER_SYSTEM)
1818 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
1820 /* This is a nop on non-init */
1824 if (m->running_as == MANAGER_SYSTEM)
1825 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
1827 /* This is a nop on non-init */
1833 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1835 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
1836 log_info("Trying to reconnect to bus...");
1840 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
1841 log_info("Loading D-Bus service...");
1842 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
1853 if (!(f = open_memstream(&dump, &size))) {
1854 log_warning("Failed to allocate memory stream.");
1858 manager_dump_units(m, f, "\t");
1859 manager_dump_jobs(m, f, "\t");
1864 log_warning("Failed to write status stream");
1869 log_dump(LOG_INFO, dump);
1876 m->exit_code = MANAGER_RELOAD;
1880 static const char * const table[] = {
1881 [0] = SPECIAL_DEFAULT_TARGET,
1882 [1] = SPECIAL_RESCUE_TARGET,
1883 [2] = SPECIAL_EMERGENCY_SERVICE,
1884 [3] = SPECIAL_HALT_TARGET,
1885 [4] = SPECIAL_POWEROFF_TARGET,
1886 [5] = SPECIAL_REBOOT_TARGET
1889 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
1890 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(table)) {
1891 manager_start_target(m, table[sfsi.ssi_signo - SIGRTMIN],
1892 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
1896 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
1902 return manager_dispatch_sigchld(m);
1907 static int process_event(Manager *m, struct epoll_event *ev) {
1914 assert(w = ev->data.ptr);
1920 /* An incoming signal? */
1921 if (ev->events != EPOLLIN)
1924 if ((r = manager_process_signal_fd(m)) < 0)
1931 /* An incoming daemon notification event? */
1932 if (ev->events != EPOLLIN)
1935 if ((r = manager_process_notify_fd(m)) < 0)
1942 /* Some fd event, to be dispatched to the units */
1943 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1950 /* Some timer event, to be dispatched to the units */
1951 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1953 if (k < 0 && (errno == EINTR || errno == EAGAIN))
1956 return k < 0 ? -errno : -EIO;
1959 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1964 /* Some mount table change, intended for the mount subsystem */
1965 mount_fd_event(m, ev->events);
1969 /* Some notification from udev, intended for the device subsystem */
1970 device_fd_event(m, ev->events);
1973 case WATCH_DBUS_WATCH:
1974 bus_watch_event(m, w, ev->events);
1977 case WATCH_DBUS_TIMEOUT:
1978 bus_timeout_event(m, w, ev->events);
1982 assert_not_reached("Unknown epoll event type.");
1988 int manager_loop(Manager *m) {
1991 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
1994 m->exit_code = MANAGER_RUNNING;
1996 /* There might still be some zombies hanging around from
1997 * before we were exec()'ed. Leat's reap them */
1998 if ((r = manager_dispatch_sigchld(m)) < 0)
2001 while (m->exit_code == MANAGER_RUNNING) {
2002 struct epoll_event event;
2005 if (!ratelimit_test(&rl)) {
2006 /* Yay, something is going seriously wrong, pause a little */
2007 log_warning("Looping too fast. Throttling execution a little.");
2011 if (manager_dispatch_load_queue(m) > 0)
2014 if (manager_dispatch_run_queue(m) > 0)
2017 if (bus_dispatch(m) > 0)
2020 if (manager_dispatch_cleanup_queue(m) > 0)
2023 if (manager_dispatch_gc_queue(m) > 0)
2026 if (manager_dispatch_dbus_queue(m) > 0)
2029 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2039 if ((r = process_event(m, &event)) < 0)
2043 return m->exit_code;
2046 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2054 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2057 if (!(n = bus_path_unescape(s+31)))
2060 u = manager_get_unit(m, n);
2071 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2080 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2083 if ((r = safe_atou(s + 30, &id)) < 0)
2086 if (!(j = manager_get_job(m, id)))
2094 static bool manager_utmp_good(Manager *m) {
2099 if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
2102 log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
2110 void manager_write_utmp_reboot(Manager *m) {
2115 if (m->utmp_reboot_written)
2118 if (m->running_as != MANAGER_SYSTEM)
2121 if (!manager_utmp_good(m))
2124 if ((r = utmp_put_reboot(m->startup_timestamp.realtime)) < 0) {
2126 if (r != -ENOENT && r != -EROFS)
2127 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2132 m->utmp_reboot_written = true;
2135 void manager_write_utmp_runlevel(Manager *m, Unit *u) {
2141 if (u->meta.type != UNIT_TARGET)
2144 if (m->running_as != MANAGER_SYSTEM)
2147 if (!manager_utmp_good(m))
2150 if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
2153 if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
2155 if (r != -ENOENT && r != -EROFS)
2156 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2160 void manager_dispatch_bus_name_owner_changed(
2163 const char* old_owner,
2164 const char *new_owner) {
2171 if (!(u = hashmap_get(m->watch_bus, name)))
2174 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2177 void manager_dispatch_bus_query_pid_done(
2188 if (!(u = hashmap_get(m->watch_bus, name)))
2191 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2194 int manager_open_serialization(FILE **_f) {
2202 if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2205 saved_umask = umask(0077);
2206 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2216 log_debug("Serializing state to %s", path);
2219 if (!(f = fdopen(fd, "w+")) < 0)
2227 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2237 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2238 if (u->meta.id != t)
2241 if (!unit_can_serialize(u))
2245 fputs(u->meta.id, f);
2248 if ((r = unit_serialize(u, f, fds)) < 0)
2258 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2264 log_debug("Deserializing state...");
2266 m->deserializing = true;
2270 char name[UNIT_NAME_MAX+2];
2273 if (!fgets(name, sizeof(name), f)) {
2283 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2286 if ((r = unit_deserialize(u, f, fds)) < 0)
2298 m->deserializing = false;
2303 int manager_reload(Manager *m) {
2310 if ((r = manager_open_serialization(&f)) < 0)
2313 if (!(fds = fdset_new())) {
2318 if ((r = manager_serialize(m, f, fds)) < 0)
2321 if (fseeko(f, 0, SEEK_SET) < 0) {
2326 /* From here on there is no way back. */
2327 manager_clear_jobs_and_units(m);
2329 /* Find new unit paths */
2330 lookup_paths_free(&m->lookup_paths);
2331 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2334 /* First, enumerate what we can from all config files */
2335 if ((q = manager_enumerate(m)) < 0)
2338 /* Second, deserialize our stored data */
2339 if ((q = manager_deserialize(m, f, fds)) < 0)
2345 /* Third, fire things up! */
2346 if ((q = manager_coldplug(m)) < 0)
2359 bool manager_is_booting_or_shutting_down(Manager *m) {
2364 /* Is the initial job still around? */
2365 if (manager_get_job(m, 1))
2368 /* Is there a job for the shutdown target? */
2369 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2370 return !!u->meta.job;
2375 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2376 [MANAGER_SYSTEM] = "system",
2377 [MANAGER_SESSION] = "session"
2380 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);