1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/epoll.h>
27 #include <sys/signalfd.h>
31 #include <sys/reboot.h>
32 #include <sys/ioctl.h>
36 #include <sys/types.h>
50 #include "ratelimit.h"
52 #include "mount-setup.h"
53 #include "unit-name.h"
54 #include "dbus-unit.h"
57 #include "path-lookup.h"
59 #include "bus-errors.h"
60 #include "exit-status.h"
62 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
63 #define GC_QUEUE_ENTRIES_MAX 16
65 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
66 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
68 /* Where clients shall send notification messages to */
69 #define NOTIFY_SOCKET "/org/freedesktop/systemd1/notify"
71 static int manager_setup_notify(Manager *m) {
74 struct sockaddr_un un;
76 struct epoll_event ev;
81 m->notify_watch.type = WATCH_NOTIFY;
82 if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
83 log_error("Failed to allocate notification socket: %m");
88 sa.sa.sa_family = AF_UNIX;
91 snprintf(sa.un.sun_path+1, sizeof(sa.un.sun_path)-1, NOTIFY_SOCKET "/%llu", random_ull());
93 strncpy(sa.un.sun_path+1, NOTIFY_SOCKET, sizeof(sa.un.sun_path)-1);
95 if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
96 log_error("bind() failed: %m");
100 if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
101 log_error("SO_PASSCRED failed: %m");
107 ev.data.ptr = &m->notify_watch;
109 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
112 if (!(m->notify_socket = strdup(sa.un.sun_path+1)))
115 log_debug("Using notification socket %s", m->notify_socket);
120 static int enable_special_signals(Manager *m) {
125 /* Enable that we get SIGINT on control-alt-del */
126 if (reboot(RB_DISABLE_CAD) < 0)
127 log_warning("Failed to enable ctrl-alt-del handling: %m");
129 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
130 log_warning("Failed to open /dev/tty0: %m");
132 /* Enable that we get SIGWINCH on kbrequest */
133 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
134 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
136 close_nointr_nofail(fd);
142 static int manager_setup_signals(Manager *m) {
144 struct epoll_event ev;
149 /* We are not interested in SIGSTOP and friends. */
151 sa.sa_handler = SIG_DFL;
152 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
153 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
155 assert_se(sigemptyset(&mask) == 0);
157 sigset_add_many(&mask,
158 SIGCHLD, /* Child died */
159 SIGTERM, /* Reexecute daemon */
160 SIGHUP, /* Reload configuration */
161 SIGUSR1, /* systemd/upstart: reconnect to D-Bus */
162 SIGUSR2, /* systemd: dump status */
163 SIGINT, /* Kernel sends us this on control-alt-del */
164 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
165 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
166 SIGRTMIN+0, /* systemd: start default.target */
167 SIGRTMIN+1, /* systemd: isolate rescue.target */
168 SIGRTMIN+2, /* systemd: isolate emergency.target */
169 SIGRTMIN+3, /* systemd: start halt.target */
170 SIGRTMIN+4, /* systemd: start poweroff.target */
171 SIGRTMIN+5, /* systemd: start reboot.target */
172 SIGRTMIN+6, /* systemd: start kexec.target */
173 SIGRTMIN+13, /* systemd: Immediate halt */
174 SIGRTMIN+14, /* systemd: Immediate poweroff */
175 SIGRTMIN+15, /* systemd: Immediate reboot */
176 SIGRTMIN+16, /* systemd: Immediate kexec */
177 SIGRTMIN+20, /* systemd: enable status messages */
178 SIGRTMIN+21, /* systemd: disable status messages */
180 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
182 m->signal_watch.type = WATCH_SIGNAL;
183 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
188 ev.data.ptr = &m->signal_watch;
190 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
193 if (m->running_as == MANAGER_SYSTEM)
194 return enable_special_signals(m);
199 int manager_new(ManagerRunningAs running_as, Manager **_m) {
204 assert(running_as >= 0);
205 assert(running_as < _MANAGER_RUNNING_AS_MAX);
207 if (!(m = new0(Manager, 1)))
210 dual_timestamp_get(&m->startup_timestamp);
212 m->running_as = running_as;
213 m->name_data_slot = m->subscribed_data_slot = -1;
214 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
215 m->pin_cgroupfs_fd = -1;
221 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
222 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
224 if (!(m->environment = strv_copy(environ)))
227 if (!(m->default_controllers = strv_new("cpu", NULL)))
230 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
233 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
236 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
239 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
242 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
245 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
248 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
251 if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
254 if ((r = manager_setup_signals(m)) < 0)
257 if ((r = manager_setup_cgroup(m)) < 0)
260 if ((r = manager_setup_notify(m)) < 0)
263 /* Try to connect to the busses, if possible. */
264 if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
268 if ((m->audit_fd = audit_open()) < 0)
269 log_error("Failed to connect to audit log: %m");
280 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
286 while ((meta = m->cleanup_queue)) {
287 assert(meta->in_cleanup_queue);
289 unit_free((Unit*) meta);
297 GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */
298 GC_OFFSET_UNSURE, /* No clue */
299 GC_OFFSET_GOOD, /* We still need this unit */
300 GC_OFFSET_BAD, /* We don't need this unit anymore */
304 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
311 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
312 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
313 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
316 if (u->meta.in_cleanup_queue)
319 if (unit_check_gc(u))
322 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
326 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
327 unit_gc_sweep(other, gc_marker);
329 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
332 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
339 /* We were unable to find anything out about this entry, so
340 * let's investigate it later */
341 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
342 unit_add_to_gc_queue(u);
346 /* We definitely know that this one is not useful anymore, so
347 * let's mark it for deletion */
348 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
349 unit_add_to_cleanup_queue(u);
353 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
356 static unsigned manager_dispatch_gc_queue(Manager *m) {
363 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
364 (m->gc_queue_timestamp <= 0 ||
365 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
368 log_debug("Running GC...");
370 m->gc_marker += _GC_OFFSET_MAX;
371 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
374 gc_marker = m->gc_marker;
376 while ((meta = m->gc_queue)) {
377 assert(meta->in_gc_queue);
379 unit_gc_sweep((Unit*) meta, gc_marker);
381 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
382 meta->in_gc_queue = false;
386 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
387 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
388 log_debug("Collecting %s", meta->id);
389 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
390 unit_add_to_cleanup_queue((Unit*) meta);
394 m->n_in_gc_queue = 0;
395 m->gc_queue_timestamp = 0;
400 static void manager_clear_jobs_and_units(Manager *m) {
406 while ((j = hashmap_first(m->transaction_jobs)))
409 while ((u = hashmap_first(m->units)))
412 manager_dispatch_cleanup_queue(m);
414 assert(!m->load_queue);
415 assert(!m->run_queue);
416 assert(!m->dbus_unit_queue);
417 assert(!m->dbus_job_queue);
418 assert(!m->cleanup_queue);
419 assert(!m->gc_queue);
421 assert(hashmap_isempty(m->transaction_jobs));
422 assert(hashmap_isempty(m->jobs));
423 assert(hashmap_isempty(m->units));
426 void manager_free(Manager *m) {
431 manager_clear_jobs_and_units(m);
433 for (c = 0; c < _UNIT_TYPE_MAX; c++)
434 if (unit_vtable[c]->shutdown)
435 unit_vtable[c]->shutdown(m);
437 /* If we reexecute ourselves, we keep the root cgroup
439 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
441 manager_undo_generators(m);
445 hashmap_free(m->units);
446 hashmap_free(m->jobs);
447 hashmap_free(m->transaction_jobs);
448 hashmap_free(m->watch_pids);
449 hashmap_free(m->watch_bus);
451 if (m->epoll_fd >= 0)
452 close_nointr_nofail(m->epoll_fd);
453 if (m->signal_watch.fd >= 0)
454 close_nointr_nofail(m->signal_watch.fd);
455 if (m->notify_watch.fd >= 0)
456 close_nointr_nofail(m->notify_watch.fd);
459 if (m->audit_fd >= 0)
460 audit_close(m->audit_fd);
463 free(m->notify_socket);
466 lookup_paths_free(&m->lookup_paths);
467 strv_free(m->environment);
469 strv_free(m->default_controllers);
471 hashmap_free(m->cgroup_bondings);
472 set_free_free(m->unit_path_cache);
477 int manager_enumerate(Manager *m) {
483 /* Let's ask every type to load all units from disk/kernel
484 * that it might know */
485 for (c = 0; c < _UNIT_TYPE_MAX; c++)
486 if (unit_vtable[c]->enumerate)
487 if ((q = unit_vtable[c]->enumerate(m)) < 0)
490 manager_dispatch_load_queue(m);
494 int manager_coldplug(Manager *m) {
502 /* Then, let's set up their initial state. */
503 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
509 if ((q = unit_coldplug(u)) < 0)
516 static void manager_build_unit_path_cache(Manager *m) {
523 set_free_free(m->unit_path_cache);
525 if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
526 log_error("Failed to allocate unit path cache.");
530 /* This simply builds a list of files we know exist, so that
531 * we don't always have to go to disk */
533 STRV_FOREACH(i, m->lookup_paths.unit_path) {
536 if (!(d = opendir(*i))) {
537 log_error("Failed to open directory: %m");
541 while ((de = readdir(d))) {
544 if (ignore_file(de->d_name))
547 if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
552 if ((r = set_put(m->unit_path_cache, p)) < 0) {
565 log_error("Failed to build unit path cache: %s", strerror(-r));
567 set_free_free(m->unit_path_cache);
568 m->unit_path_cache = NULL;
574 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
579 manager_run_generators(m);
581 manager_build_unit_path_cache(m);
583 /* If we will deserialize make sure that during enumeration
584 * this is already known, so we increase the counter here
587 m->n_deserializing ++;
589 /* First, enumerate what we can from all config files */
590 r = manager_enumerate(m);
592 /* Second, deserialize if there is something to deserialize */
594 if ((q = manager_deserialize(m, serialization, fds)) < 0)
597 /* Third, fire things up! */
598 if ((q = manager_coldplug(m)) < 0)
602 assert(m->n_deserializing > 0);
603 m->n_deserializing --;
609 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
613 /* Deletes one job from the transaction */
615 manager_transaction_unlink_job(m, j, delete_dependencies);
621 static void transaction_delete_unit(Manager *m, Unit *u) {
624 /* Deletes all jobs associated with a certain unit from the
627 while ((j = hashmap_get(m->transaction_jobs, u)))
628 transaction_delete_job(m, j, true);
631 static void transaction_clean_dependencies(Manager *m) {
637 /* Drops all dependencies of all installed jobs */
639 HASHMAP_FOREACH(j, m->jobs, i) {
640 while (j->subject_list)
641 job_dependency_free(j->subject_list);
642 while (j->object_list)
643 job_dependency_free(j->object_list);
646 assert(!m->transaction_anchor);
649 static void transaction_abort(Manager *m) {
654 while ((j = hashmap_first(m->transaction_jobs)))
656 transaction_delete_job(m, j, true);
660 assert(hashmap_isempty(m->transaction_jobs));
662 transaction_clean_dependencies(m);
665 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
670 /* A recursive sweep through the graph that marks all units
671 * that matter to the anchor job, i.e. are directly or
672 * indirectly a dependency of the anchor job via paths that
673 * are fully marked as mattering. */
678 l = m->transaction_anchor;
680 LIST_FOREACH(subject, l, l) {
682 /* This link does not matter */
686 /* This unit has already been marked */
687 if (l->object->generation == generation)
690 l->object->matters_to_anchor = true;
691 l->object->generation = generation;
693 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
697 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
698 JobDependency *l, *last;
702 assert(j->unit == other->unit);
703 assert(!j->installed);
705 /* Merges 'other' into 'j' and then deletes j. */
708 j->state = JOB_WAITING;
709 j->override = j->override || other->override;
711 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
713 /* Patch us in as new owner of the JobDependency objects */
715 LIST_FOREACH(subject, l, other->subject_list) {
716 assert(l->subject == other);
721 /* Merge both lists */
723 last->subject_next = j->subject_list;
725 j->subject_list->subject_prev = last;
726 j->subject_list = other->subject_list;
729 /* Patch us in as new owner of the JobDependency objects */
731 LIST_FOREACH(object, l, other->object_list) {
732 assert(l->object == other);
737 /* Merge both lists */
739 last->object_next = j->object_list;
741 j->object_list->object_prev = last;
742 j->object_list = other->object_list;
745 /* Kill the other job */
746 other->subject_list = NULL;
747 other->object_list = NULL;
748 transaction_delete_job(m, other, true);
750 static bool job_is_conflicted_by(Job *j) {
755 /* Returns true if this job is pulled in by a least one
756 * ConflictedBy dependency. */
758 LIST_FOREACH(object, l, j->object_list)
765 static int delete_one_unmergeable_job(Manager *m, Job *j) {
770 /* Tries to delete one item in the linked list
771 * j->transaction_next->transaction_next->... that conflicts
772 * whith another one, in an attempt to make an inconsistent
773 * transaction work. */
775 /* We rely here on the fact that if a merged with b does not
776 * merge with c, either a or b merge with c neither */
777 LIST_FOREACH(transaction, j, j)
778 LIST_FOREACH(transaction, k, j->transaction_next) {
781 /* Is this one mergeable? Then skip it */
782 if (job_type_is_mergeable(j->type, k->type))
785 /* Ok, we found two that conflict, let's see if we can
786 * drop one of them */
787 if (!j->matters_to_anchor && !k->matters_to_anchor) {
789 /* Both jobs don't matter, so let's
790 * find the one that is smarter to
791 * remove. Let's think positive and
792 * rather remove stops then starts --
793 * except if something is being
794 * stopped because it is conflicted by
795 * another unit in which case we
796 * rather remove the start. */
798 log_debug("Looking at job %s/%s conflicted_by=%s", j->unit->meta.id, job_type_to_string(j->type), yes_no(j->type == JOB_STOP && job_is_conflicted_by(j)));
799 log_debug("Looking at job %s/%s conflicted_by=%s", k->unit->meta.id, job_type_to_string(k->type), yes_no(k->type == JOB_STOP && job_is_conflicted_by(k)));
801 if (j->type == JOB_STOP) {
803 if (job_is_conflicted_by(j))
808 } else if (k->type == JOB_STOP) {
810 if (job_is_conflicted_by(k))
817 } else if (!j->matters_to_anchor)
819 else if (!k->matters_to_anchor)
824 /* Ok, we can drop one, so let's do so. */
825 log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
826 transaction_delete_job(m, d, true);
833 static int transaction_merge_jobs(Manager *m, DBusError *e) {
840 /* First step, check whether any of the jobs for one specific
841 * task conflict. If so, try to drop one of them. */
842 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
847 LIST_FOREACH(transaction, k, j->transaction_next) {
848 if (job_type_merge(&t, k->type) >= 0)
851 /* OK, we could not merge all jobs for this
852 * action. Let's see if we can get rid of one
855 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
856 /* Ok, we managed to drop one, now
857 * let's ask our callers to call us
858 * again after garbage collecting */
861 /* We couldn't merge anything. Failure */
862 dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
863 job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
868 /* Second step, merge the jobs. */
869 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
873 /* Merge all transactions */
874 LIST_FOREACH(transaction, k, j->transaction_next)
875 assert_se(job_type_merge(&t, k->type) == 0);
877 /* If an active job is mergeable, merge it too */
878 if (j->unit->meta.job)
879 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
881 while ((k = j->transaction_next)) {
883 transaction_merge_and_delete_job(m, k, j, t);
886 transaction_merge_and_delete_job(m, j, k, t);
889 assert(!j->transaction_next);
890 assert(!j->transaction_prev);
896 static void transaction_drop_redundant(Manager *m) {
901 /* Goes through the transaction and removes all jobs that are
910 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
911 bool changes_something = false;
914 LIST_FOREACH(transaction, k, j) {
916 if (!job_is_anchor(k) &&
917 (j->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))))
920 changes_something = true;
924 if (changes_something)
927 /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
928 transaction_delete_job(m, j, false);
936 static bool unit_matters_to_anchor(Unit *u, Job *j) {
938 assert(!j->transaction_prev);
940 /* Checks whether at least one of the jobs for this unit
941 * matters to the anchor. */
943 LIST_FOREACH(transaction, j, j)
944 if (j->matters_to_anchor)
950 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
957 assert(!j->transaction_prev);
959 /* Does a recursive sweep through the ordering graph, looking
960 * for a cycle. If we find cycle we try to break it. */
962 /* Have we seen this before? */
963 if (j->generation == generation) {
966 /* If the marker is NULL we have been here already and
967 * decided the job was loop-free from here. Hence
968 * shortcut things and return right-away. */
972 /* So, the marker is not NULL and we already have been
973 * here. We have a cycle. Let's try to break it. We go
974 * backwards in our path and try to find a suitable
975 * job to remove. We use the marker to find our way
976 * back, since smart how we are we stored our way back
978 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
981 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
983 log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
987 !unit_matters_to_anchor(k->unit, k)) {
988 /* Ok, we can drop this one, so let's
993 /* Check if this in fact was the beginning of
1001 log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1002 transaction_delete_unit(m, delete->unit);
1006 log_error("Unable to break cycle");
1008 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1012 /* Make the marker point to where we come from, so that we can
1013 * find our way backwards if we want to break a cycle. We use
1014 * a special marker for the beginning: we point to
1016 j->marker = from ? from : j;
1017 j->generation = generation;
1019 /* We assume that the the dependencies are bidirectional, and
1020 * hence can ignore UNIT_AFTER */
1021 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1024 /* Is there a job for this unit? */
1025 if (!(o = hashmap_get(m->transaction_jobs, u)))
1027 /* Ok, there is no job for this in the
1028 * transaction, but maybe there is already one
1030 if (!(o = u->meta.job))
1033 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1037 /* Ok, let's backtrack, and remember that this entry is not on
1038 * our path anymore. */
1044 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1053 /* Check if the ordering graph is cyclic. If it is, try to fix
1054 * that up by dropping one of the jobs. */
1056 g = (*generation)++;
1058 HASHMAP_FOREACH(j, m->transaction_jobs, i)
1059 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1065 static void transaction_collect_garbage(Manager *m) {
1070 /* Drop jobs that are not required by any other job */
1078 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1079 if (j->object_list) {
1080 /* log_debug("Keeping job %s/%s because of %s/%s", */
1081 /* j->unit->meta.id, job_type_to_string(j->type), */
1082 /* j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1083 /* j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1087 /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1088 transaction_delete_job(m, j, true);
1096 static int transaction_is_destructive(Manager *m, DBusError *e) {
1102 /* Checks whether applying this transaction means that
1103 * existing jobs would be replaced */
1105 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1108 assert(!j->transaction_prev);
1109 assert(!j->transaction_next);
1111 if (j->unit->meta.job &&
1112 j->unit->meta.job != j &&
1113 !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1115 dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1123 static void transaction_minimize_impact(Manager *m) {
1127 /* Drops all unnecessary jobs that reverse already active jobs
1128 * or that stop a running service. */
1136 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1137 LIST_FOREACH(transaction, j, j) {
1138 bool stops_running_service, changes_existing_job;
1140 /* If it matters, we shouldn't drop it */
1141 if (j->matters_to_anchor)
1144 /* Would this stop a running service?
1145 * Would this change an existing job?
1146 * If so, let's drop this entry */
1148 stops_running_service =
1149 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1151 changes_existing_job =
1152 j->unit->meta.job &&
1153 job_type_is_conflicting(j->type, j->unit->meta.job->type);
1155 if (!stops_running_service && !changes_existing_job)
1158 if (stops_running_service)
1159 log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1161 if (changes_existing_job)
1162 log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1164 /* Ok, let's get rid of this */
1165 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1167 transaction_delete_job(m, j, true);
1179 static int transaction_apply(Manager *m) {
1184 /* Moves the transaction jobs to the set of active jobs */
1186 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1188 assert(!j->transaction_prev);
1189 assert(!j->transaction_next);
1194 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1198 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1200 /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1204 if (j->unit->meta.job)
1205 job_free(j->unit->meta.job);
1207 j->unit->meta.job = j;
1208 j->installed = true;
1209 m->n_installed_jobs ++;
1211 /* We're fully installed. Now let's free data we don't
1214 assert(!j->transaction_next);
1215 assert(!j->transaction_prev);
1217 job_add_to_run_queue(j);
1218 job_add_to_dbus_queue(j);
1221 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1224 /* As last step, kill all remaining job dependencies. */
1225 transaction_clean_dependencies(m);
1231 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1235 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1241 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1243 unsigned generation = 1;
1247 /* This applies the changes recorded in transaction_jobs to
1248 * the actual list of jobs, if possible. */
1250 /* First step: figure out which jobs matter */
1251 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1253 /* Second step: Try not to stop any running services if
1254 * we don't have to. Don't try to reverse running
1255 * jobs if we don't have to. */
1256 if (mode == JOB_FAIL)
1257 transaction_minimize_impact(m);
1259 /* Third step: Drop redundant jobs */
1260 transaction_drop_redundant(m);
1263 /* Fourth step: Let's remove unneeded jobs that might
1265 transaction_collect_garbage(m);
1267 /* Fifth step: verify order makes sense and correct
1268 * cycles if necessary and possible */
1269 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1273 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1277 /* Let's see if the resulting transaction ordering
1278 * graph is still cyclic... */
1282 /* Sixth step: let's drop unmergeable entries if
1283 * necessary and possible, merge entries we can
1285 if ((r = transaction_merge_jobs(m, e)) >= 0)
1289 log_warning("Requested transaction contains unmergable jobs: %s", bus_error(e, r));
1293 /* Seventh step: an entry got dropped, let's garbage
1294 * collect its dependencies. */
1295 transaction_collect_garbage(m);
1297 /* Let's see if the resulting transaction still has
1298 * unmergeable entries ... */
1301 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1302 transaction_drop_redundant(m);
1304 /* Ninth step: check whether we can actually apply this */
1305 if (mode == JOB_FAIL)
1306 if ((r = transaction_is_destructive(m, e)) < 0) {
1307 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1311 /* Tenth step: apply changes */
1312 if ((r = transaction_apply(m)) < 0) {
1313 log_warning("Failed to apply transaction: %s", strerror(-r));
1317 assert(hashmap_isempty(m->transaction_jobs));
1318 assert(!m->transaction_anchor);
1323 transaction_abort(m);
1327 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1333 /* Looks for an axisting prospective job and returns that. If
1334 * it doesn't exist it is created and added to the prospective
1337 f = hashmap_get(m->transaction_jobs, unit);
1339 LIST_FOREACH(transaction, j, f) {
1340 assert(j->unit == unit);
1342 if (j->type == type) {
1349 if (unit->meta.job && unit->meta.job->type == type)
1351 else if (!(j = job_new(m, type, unit)))
1356 j->matters_to_anchor = false;
1357 j->override = override;
1359 LIST_PREPEND(Job, transaction, f, j);
1361 if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1369 /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1374 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1378 if (j->transaction_prev)
1379 j->transaction_prev->transaction_next = j->transaction_next;
1380 else if (j->transaction_next)
1381 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1383 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1385 if (j->transaction_next)
1386 j->transaction_next->transaction_prev = j->transaction_prev;
1388 j->transaction_prev = j->transaction_next = NULL;
1390 while (j->subject_list)
1391 job_dependency_free(j->subject_list);
1393 while (j->object_list) {
1394 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1396 job_dependency_free(j->object_list);
1398 if (other && delete_dependencies) {
1399 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1400 other->unit->meta.id, job_type_to_string(other->type),
1401 j->unit->meta.id, job_type_to_string(j->type));
1402 transaction_delete_job(m, other, delete_dependencies);
1407 static int transaction_add_job_and_dependencies(
1424 assert(type < _JOB_TYPE_MAX);
1427 if (unit->meta.load_state != UNIT_LOADED &&
1428 unit->meta.load_state != UNIT_ERROR &&
1429 unit->meta.load_state != UNIT_MASKED) {
1430 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1434 if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1435 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1436 "Unit %s failed to load: %s. "
1437 "See system logs and 'systemctl status' for details.",
1439 strerror(-unit->meta.load_error));
1443 if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1444 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1448 if (!unit_job_is_applicable(unit, type)) {
1449 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);
1453 /* First add the job. */
1454 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1457 /* Then, add a link to the job. */
1458 if (!job_dependency_new(by, ret, matters, conflicts))
1464 /* If we are following some other unit, make sure we
1465 * add all dependencies of everybody following. */
1466 if (unit_following_set(ret->unit, &following) > 0) {
1467 SET_FOREACH(dep, following, i)
1468 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, e, NULL)) < 0) {
1469 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1475 set_free(following);
1478 /* Finally, recursively add in all dependencies. */
1479 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1480 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1481 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, e, NULL)) < 0) {
1489 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1490 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, e, NULL)) < 0) {
1499 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1500 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, e, NULL)) < 0) {
1501 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1507 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1508 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, e, NULL)) < 0) {
1509 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1515 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1516 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, e, NULL)) < 0) {
1525 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1526 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, e, NULL)) < 0) {
1527 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1533 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1534 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, e, NULL)) < 0) {
1543 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1544 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, e, NULL)) < 0) {
1545 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1551 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1553 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1554 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, e, NULL)) < 0) {
1563 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1564 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, e, NULL)) < 0) {
1574 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1586 static int transaction_add_isolate_jobs(Manager *m) {
1594 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1596 /* ignore aliases */
1597 if (u->meta.id != k)
1600 if (UNIT_VTABLE(u)->no_isolate)
1603 /* No need to stop inactive jobs */
1604 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1607 /* Is there already something listed for this? */
1608 if (hashmap_get(m->transaction_jobs, u))
1611 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, NULL, NULL)) < 0)
1612 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1618 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1623 assert(type < _JOB_TYPE_MAX);
1625 assert(mode < _JOB_MODE_MAX);
1627 if (mode == JOB_ISOLATE && type != JOB_START) {
1628 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1632 if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1633 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1637 log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1639 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false, e, &ret)) < 0) {
1640 transaction_abort(m);
1644 if (mode == JOB_ISOLATE)
1645 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1646 transaction_abort(m);
1650 if ((r = transaction_activate(m, mode, e)) < 0)
1653 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1661 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1666 assert(type < _JOB_TYPE_MAX);
1668 assert(mode < _JOB_MODE_MAX);
1670 if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1673 return manager_add_job(m, type, unit, mode, override, e, _ret);
1676 Job *manager_get_job(Manager *m, uint32_t id) {
1679 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1682 Unit *manager_get_unit(Manager *m, const char *name) {
1686 return hashmap_get(m->units, name);
1689 unsigned manager_dispatch_load_queue(Manager *m) {
1695 /* Make sure we are not run recursively */
1696 if (m->dispatching_load_queue)
1699 m->dispatching_load_queue = true;
1701 /* Dispatches the load queue. Takes a unit from the queue and
1702 * tries to load its data until the queue is empty */
1704 while ((meta = m->load_queue)) {
1705 assert(meta->in_load_queue);
1707 unit_load((Unit*) meta);
1711 m->dispatching_load_queue = false;
1715 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1720 assert(name || path);
1722 /* This will prepare the unit for loading, but not actually
1723 * load anything from disk. */
1725 if (path && !is_path(path)) {
1726 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1731 name = file_name_from_path(path);
1733 if (!unit_name_is_valid(name, false)) {
1734 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1738 if ((ret = manager_get_unit(m, name))) {
1743 if (!(ret = unit_new(m)))
1747 if (!(ret->meta.fragment_path = strdup(path))) {
1752 if ((r = unit_add_name(ret, name)) < 0) {
1757 unit_add_to_load_queue(ret);
1758 unit_add_to_dbus_queue(ret);
1759 unit_add_to_gc_queue(ret);
1767 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1772 /* This will load the service information files, but not actually
1773 * start any services or anything. */
1775 if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1778 manager_dispatch_load_queue(m);
1781 *_ret = unit_follow_merge(*_ret);
1786 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1793 HASHMAP_FOREACH(j, s->jobs, i)
1794 job_dump(j, f, prefix);
1797 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1805 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1806 if (u->meta.id == t)
1807 unit_dump(u, f, prefix);
1810 void manager_clear_jobs(Manager *m) {
1815 transaction_abort(m);
1817 while ((j = hashmap_first(m->jobs)))
1821 unsigned manager_dispatch_run_queue(Manager *m) {
1825 if (m->dispatching_run_queue)
1828 m->dispatching_run_queue = true;
1830 while ((j = m->run_queue)) {
1831 assert(j->installed);
1832 assert(j->in_run_queue);
1834 job_run_and_invalidate(j);
1838 m->dispatching_run_queue = false;
1842 unsigned manager_dispatch_dbus_queue(Manager *m) {
1849 if (m->dispatching_dbus_queue)
1852 m->dispatching_dbus_queue = true;
1854 while ((meta = m->dbus_unit_queue)) {
1855 assert(meta->in_dbus_queue);
1857 bus_unit_send_change_signal((Unit*) meta);
1861 while ((j = m->dbus_job_queue)) {
1862 assert(j->in_dbus_queue);
1864 bus_job_send_change_signal(j);
1868 m->dispatching_dbus_queue = false;
1872 static int manager_process_notify_fd(Manager *m) {
1879 struct msghdr msghdr;
1881 struct ucred *ucred;
1883 struct cmsghdr cmsghdr;
1884 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1890 iovec.iov_base = buf;
1891 iovec.iov_len = sizeof(buf)-1;
1895 msghdr.msg_iov = &iovec;
1896 msghdr.msg_iovlen = 1;
1897 msghdr.msg_control = &control;
1898 msghdr.msg_controllen = sizeof(control);
1900 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1904 if (errno == EAGAIN || errno == EINTR)
1910 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1911 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1912 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1913 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1914 log_warning("Received notify message without credentials. Ignoring.");
1918 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1920 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1921 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1922 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1926 assert((size_t) n < sizeof(buf));
1928 if (!(tags = strv_split(buf, "\n\r")))
1931 log_debug("Got notification message for unit %s", u->meta.id);
1933 if (UNIT_VTABLE(u)->notify_message)
1934 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1942 static int manager_dispatch_sigchld(Manager *m) {
1952 /* First we call waitd() for a PID and do not reap the
1953 * zombie. That way we can still access /proc/$PID for
1954 * it while it is a zombie. */
1955 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1957 if (errno == ECHILD)
1969 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1972 get_process_name(si.si_pid, &name);
1973 log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1977 /* Let's flush any message the dying child might still
1978 * have queued for us. This ensures that the process
1979 * still exists in /proc so that we can figure out
1980 * which cgroup and hence unit it belongs to. */
1981 if ((r = manager_process_notify_fd(m)) < 0)
1984 /* And now figure out the unit this belongs to */
1985 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
1986 u = cgroup_unit_by_pid(m, si.si_pid);
1988 /* And now, we actually reap the zombie. */
1989 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1996 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1999 log_debug("Child %lu died (code=%s, status=%i/%s)",
2000 (long unsigned) si.si_pid,
2001 sigchld_code_to_string(si.si_code),
2003 strna(si.si_code == CLD_EXITED
2004 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2005 : signal_to_string(si.si_status)));
2010 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2012 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2013 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2019 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2023 dbus_error_init(&error);
2025 log_debug("Activating special unit %s", name);
2027 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2028 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2030 dbus_error_free(&error);
2035 static int manager_process_signal_fd(Manager *m) {
2037 struct signalfd_siginfo sfsi;
2038 bool sigchld = false;
2043 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2048 if (errno == EINTR || errno == EAGAIN)
2054 log_debug("Received SIG%s", strna(signal_to_string(sfsi.ssi_signo)));
2056 switch (sfsi.ssi_signo) {
2063 if (m->running_as == MANAGER_SYSTEM) {
2064 /* This is for compatibility with the
2065 * original sysvinit */
2066 m->exit_code = MANAGER_REEXECUTE;
2073 if (m->running_as == MANAGER_SYSTEM) {
2074 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2078 /* Run the exit target if there is one, if not, just exit. */
2079 if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2080 m->exit_code = MANAGER_EXIT;
2087 if (m->running_as == MANAGER_SYSTEM)
2088 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2090 /* This is a nop on non-init */
2094 if (m->running_as == MANAGER_SYSTEM)
2095 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2097 /* This is a nop on non-init */
2103 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2105 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2106 log_info("Trying to reconnect to bus...");
2110 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2111 log_info("Loading D-Bus service...");
2112 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2123 if (!(f = open_memstream(&dump, &size))) {
2124 log_warning("Failed to allocate memory stream.");
2128 manager_dump_units(m, f, "\t");
2129 manager_dump_jobs(m, f, "\t");
2134 log_warning("Failed to write status stream");
2139 log_dump(LOG_INFO, dump);
2146 m->exit_code = MANAGER_RELOAD;
2150 /* Starting SIGRTMIN+0 */
2151 static const char * const target_table[] = {
2152 [0] = SPECIAL_DEFAULT_TARGET,
2153 [1] = SPECIAL_RESCUE_TARGET,
2154 [2] = SPECIAL_EMERGENCY_TARGET,
2155 [3] = SPECIAL_HALT_TARGET,
2156 [4] = SPECIAL_POWEROFF_TARGET,
2157 [5] = SPECIAL_REBOOT_TARGET,
2158 [6] = SPECIAL_KEXEC_TARGET
2161 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2162 static const ManagerExitCode code_table[] = {
2164 [1] = MANAGER_POWEROFF,
2165 [2] = MANAGER_REBOOT,
2169 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2170 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2171 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2172 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2176 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2177 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2178 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2182 switch (sfsi.ssi_signo - SIGRTMIN) {
2185 log_debug("Enabling showing of status.");
2186 m->show_status = true;
2190 log_debug("Disabling showing of status.");
2191 m->show_status = false;
2195 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2202 return manager_dispatch_sigchld(m);
2207 static int process_event(Manager *m, struct epoll_event *ev) {
2214 assert(w = ev->data.ptr);
2216 if (w->type == WATCH_INVALID)
2223 /* An incoming signal? */
2224 if (ev->events != EPOLLIN)
2227 if ((r = manager_process_signal_fd(m)) < 0)
2234 /* An incoming daemon notification event? */
2235 if (ev->events != EPOLLIN)
2238 if ((r = manager_process_notify_fd(m)) < 0)
2245 /* Some fd event, to be dispatched to the units */
2246 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2249 case WATCH_UNIT_TIMER:
2250 case WATCH_JOB_TIMER: {
2254 /* Some timer event, to be dispatched to the units */
2255 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2257 if (k < 0 && (errno == EINTR || errno == EAGAIN))
2260 return k < 0 ? -errno : -EIO;
2263 if (w->type == WATCH_UNIT_TIMER)
2264 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2266 job_timer_event(w->data.job, v, w);
2271 /* Some mount table change, intended for the mount subsystem */
2272 mount_fd_event(m, ev->events);
2276 /* Some swap table change, intended for the swap subsystem */
2277 swap_fd_event(m, ev->events);
2281 /* Some notification from udev, intended for the device subsystem */
2282 device_fd_event(m, ev->events);
2285 case WATCH_DBUS_WATCH:
2286 bus_watch_event(m, w, ev->events);
2289 case WATCH_DBUS_TIMEOUT:
2290 bus_timeout_event(m, w, ev->events);
2294 log_error("event type=%i", w->type);
2295 assert_not_reached("Unknown epoll event type.");
2301 int manager_loop(Manager *m) {
2304 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
2307 m->exit_code = MANAGER_RUNNING;
2309 /* Release the path cache */
2310 set_free_free(m->unit_path_cache);
2311 m->unit_path_cache = NULL;
2313 manager_check_finished(m);
2315 /* There might still be some zombies hanging around from
2316 * before we were exec()'ed. Leat's reap them */
2317 if ((r = manager_dispatch_sigchld(m)) < 0)
2320 while (m->exit_code == MANAGER_RUNNING) {
2321 struct epoll_event event;
2324 if (!ratelimit_test(&rl)) {
2325 /* Yay, something is going seriously wrong, pause a little */
2326 log_warning("Looping too fast. Throttling execution a little.");
2330 if (manager_dispatch_load_queue(m) > 0)
2333 if (manager_dispatch_run_queue(m) > 0)
2336 if (bus_dispatch(m) > 0)
2339 if (manager_dispatch_cleanup_queue(m) > 0)
2342 if (manager_dispatch_gc_queue(m) > 0)
2345 if (manager_dispatch_dbus_queue(m) > 0)
2348 if (swap_dispatch_reload(m) > 0)
2351 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2361 if ((r = process_event(m, &event)) < 0)
2365 return m->exit_code;
2368 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2376 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2379 if (!(n = bus_path_unescape(s+31)))
2382 u = manager_get_unit(m, n);
2393 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2402 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2405 if ((r = safe_atou(s + 30, &id)) < 0)
2408 if (!(j = manager_get_job(m, id)))
2416 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2421 if (m->audit_fd < 0)
2424 /* Don't generate audit events if the service was already
2425 * started and we're just deserializing */
2426 if (m->n_deserializing > 0)
2429 if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2430 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2434 if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0)
2435 log_error("Failed to send audit message: %m");
2442 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2444 union sockaddr_union sa;
2446 char *message = NULL;
2448 /* Don't generate plymouth events if the service was already
2449 * started and we're just deserializing */
2450 if (m->n_deserializing > 0)
2453 if (m->running_as != MANAGER_SYSTEM)
2456 if (u->meta.type != UNIT_SERVICE &&
2457 u->meta.type != UNIT_MOUNT &&
2458 u->meta.type != UNIT_SWAP)
2461 /* We set SOCK_NONBLOCK here so that we rather drop the
2462 * message then wait for plymouth */
2463 if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2464 log_error("socket() failed: %m");
2469 sa.sa.sa_family = AF_UNIX;
2470 strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2471 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2473 if (errno != EPIPE &&
2476 errno != ECONNREFUSED &&
2477 errno != ECONNRESET &&
2478 errno != ECONNABORTED)
2479 log_error("connect() failed: %m");
2484 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2485 log_error("Out of memory");
2490 if (write(fd, message, n + 1) != n + 1) {
2492 if (errno != EPIPE &&
2495 errno != ECONNREFUSED &&
2496 errno != ECONNRESET &&
2497 errno != ECONNABORTED)
2498 log_error("Failed to write Plymouth message: %m");
2505 close_nointr_nofail(fd);
2510 void manager_dispatch_bus_name_owner_changed(
2513 const char* old_owner,
2514 const char *new_owner) {
2521 if (!(u = hashmap_get(m->watch_bus, name)))
2524 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2527 void manager_dispatch_bus_query_pid_done(
2538 if (!(u = hashmap_get(m->watch_bus, name)))
2541 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2544 int manager_open_serialization(Manager *m, FILE **_f) {
2552 if (m->running_as == MANAGER_SYSTEM) {
2553 mkdir_p("/dev/.systemd", 0755);
2555 if (asprintf(&path, "/dev/.systemd/dump-%lu-XXXXXX", (unsigned long) getpid()) < 0)
2558 if (asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid()) < 0)
2562 saved_umask = umask(0077);
2563 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2573 log_debug("Serializing state to %s", path);
2576 if (!(f = fdopen(fd, "w+")) < 0)
2584 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2594 dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2595 dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2596 dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2600 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2601 if (u->meta.id != t)
2604 if (!unit_can_serialize(u))
2608 fputs(u->meta.id, f);
2611 if ((r = unit_serialize(u, f, fds)) < 0)
2621 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2627 log_debug("Deserializing state...");
2629 m->n_deserializing ++;
2632 char line[1024], *l;
2634 if (!fgets(line, sizeof(line), f)) {
2649 if (startswith(l, "initrd-timestamp="))
2650 dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2651 else if (startswith(l, "startup-timestamp="))
2652 dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2653 else if (startswith(l, "finish-timestamp="))
2654 dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2656 log_debug("Unknown serialization item '%s'", l);
2661 char name[UNIT_NAME_MAX+2];
2664 if (!fgets(name, sizeof(name), f)) {
2675 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2678 if ((r = unit_deserialize(u, f, fds)) < 0)
2688 assert(m->n_deserializing > 0);
2689 m->n_deserializing --;
2694 int manager_reload(Manager *m) {
2701 if ((r = manager_open_serialization(m, &f)) < 0)
2704 if (!(fds = fdset_new())) {
2709 if ((r = manager_serialize(m, f, fds)) < 0)
2712 if (fseeko(f, 0, SEEK_SET) < 0) {
2717 /* From here on there is no way back. */
2718 manager_clear_jobs_and_units(m);
2719 manager_undo_generators(m);
2721 /* Find new unit paths */
2722 lookup_paths_free(&m->lookup_paths);
2723 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2726 manager_run_generators(m);
2728 manager_build_unit_path_cache(m);
2730 m->n_deserializing ++;
2732 /* First, enumerate what we can from all config files */
2733 if ((q = manager_enumerate(m)) < 0)
2736 /* Second, deserialize our stored data */
2737 if ((q = manager_deserialize(m, f, fds)) < 0)
2743 /* Third, fire things up! */
2744 if ((q = manager_coldplug(m)) < 0)
2747 assert(m->n_deserializing > 0);
2748 m->n_deserializing ++;
2760 bool manager_is_booting_or_shutting_down(Manager *m) {
2765 /* Is the initial job still around? */
2766 if (manager_get_job(m, 1))
2769 /* Is there a job for the shutdown target? */
2770 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2771 return !!u->meta.job;
2776 void manager_reset_failed(Manager *m) {
2782 HASHMAP_FOREACH(u, m->units, i)
2783 unit_reset_failed(u);
2786 int manager_set_console(Manager *m, const char *console) {
2791 if (!(c = strdup(console)))
2797 log_debug("Using kernel console %s", c);
2802 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2808 /* Returns true if the unit is inactive or going down */
2809 if (!(u = manager_get_unit(m, name)))
2812 return unit_pending_inactive(u);
2815 void manager_check_finished(Manager *m) {
2816 char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2820 if (dual_timestamp_is_set(&m->finish_timestamp))
2823 if (hashmap_size(m->jobs) > 0)
2826 dual_timestamp_get(&m->finish_timestamp);
2828 if (m->running_as == MANAGER_SYSTEM) {
2829 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2830 log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2831 format_timespan(kernel, sizeof(kernel),
2832 m->initrd_timestamp.monotonic),
2833 format_timespan(initrd, sizeof(initrd),
2834 m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2835 format_timespan(userspace, sizeof(userspace),
2836 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2837 format_timespan(sum, sizeof(sum),
2838 m->finish_timestamp.monotonic));
2840 log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2841 format_timespan(kernel, sizeof(kernel),
2842 m->startup_timestamp.monotonic),
2843 format_timespan(userspace, sizeof(userspace),
2844 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2845 format_timespan(sum, sizeof(sum),
2846 m->finish_timestamp.monotonic));
2848 log_debug("Startup finished in %s.",
2849 format_timespan(userspace, sizeof(userspace),
2850 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2854 void manager_run_generators(Manager *m) {
2857 Hashmap *pids = NULL;
2858 const char *generator_path;
2862 generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2863 if (!(d = opendir(generator_path))) {
2865 if (errno == ENOENT)
2868 log_error("Failed to enumerate generator directory: %m");
2872 if (!m->generator_unit_path) {
2874 char system_path[] = "/dev/.systemd/generator-XXXXXX",
2875 user_path[] = "/tmp/systemd-generator-XXXXXX";
2877 if (!(p = mkdtemp(m->running_as == MANAGER_SYSTEM ? system_path : user_path))) {
2878 log_error("Failed to generate generator directory: %m");
2882 if (!(m->generator_unit_path = strdup(p))) {
2883 log_error("Failed to allocate generator unit path.");
2888 if (!(pids = hashmap_new(trivial_hash_func, trivial_compare_func))) {
2889 log_error("Failed to allocate set.");
2893 while ((de = readdir(d))) {
2898 if (ignore_file(de->d_name))
2901 if (de->d_type != DT_REG &&
2902 de->d_type != DT_LNK &&
2903 de->d_type != DT_UNKNOWN)
2906 if (asprintf(&path, "%s/%s", generator_path, de->d_name) < 0) {
2907 log_error("Out of memory");
2911 if ((pid = fork()) < 0) {
2912 log_error("Failed to fork: %m");
2918 const char *arguments[5];
2921 arguments[0] = path;
2922 arguments[1] = m->generator_unit_path;
2923 arguments[2] = NULL;
2925 execv(path, (char **) arguments);
2927 log_error("Failed to execute %s: %m", path);
2928 _exit(EXIT_FAILURE);
2931 log_debug("Spawned generator %s as %lu", path, (unsigned long) pid);
2933 if ((k = hashmap_put(pids, UINT_TO_PTR(pid), path)) < 0) {
2934 log_error("Failed to add PID to set: %s", strerror(-k));
2939 while (!hashmap_isempty(pids)) {
2944 if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
2949 log_error("waitid() failed: %m");
2953 if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) {
2954 if (!is_clean_exit(si.si_code, si.si_status)) {
2955 if (si.si_code == CLD_EXITED)
2956 log_error("%s exited with exit status %i.", path, si.si_status);
2958 log_error("%s terminated by signal %s.", path, signal_to_string(si.si_status));
2960 log_debug("Generator %s exited successfully.", path);
2966 if (rmdir(m->generator_unit_path) >= 0) {
2967 /* Uh? we were able to remove this dir? I guess that
2968 * means the directory was empty, hence let's shortcut
2971 free(m->generator_unit_path);
2972 m->generator_unit_path = NULL;
2976 if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
2979 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
2980 log_error("Failed to add generator directory to unit search path: %m");
2984 strv_free(m->lookup_paths.unit_path);
2985 m->lookup_paths.unit_path = l;
2987 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
2995 hashmap_free_free(pids);
2998 void manager_undo_generators(Manager *m) {
3001 if (!m->generator_unit_path)
3004 strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
3005 rm_rf(m->generator_unit_path, false, true);
3007 free(m->generator_unit_path);
3008 m->generator_unit_path = NULL;
3011 int manager_set_default_controllers(Manager *m, char **controllers) {
3016 if (!(l = strv_copy(controllers)))
3019 strv_free(m->default_controllers);
3020 m->default_controllers = l;
3025 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3026 [MANAGER_SYSTEM] = "system",
3027 [MANAGER_USER] = "user"
3030 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);