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 */
178 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
180 m->signal_watch.type = WATCH_SIGNAL;
181 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
186 ev.data.ptr = &m->signal_watch;
188 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
191 if (m->running_as == MANAGER_SYSTEM)
192 return enable_special_signals(m);
197 int manager_new(ManagerRunningAs running_as, Manager **_m) {
202 assert(running_as >= 0);
203 assert(running_as < _MANAGER_RUNNING_AS_MAX);
205 if (!(m = new0(Manager, 1)))
208 dual_timestamp_get(&m->startup_timestamp);
210 m->running_as = running_as;
211 m->name_data_slot = m->subscribed_data_slot = -1;
212 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
213 m->pin_cgroupfs_fd = -1;
219 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
220 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
222 if (!(m->environment = strv_copy(environ)))
225 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
228 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
231 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
234 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
237 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
240 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
243 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
246 if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
249 if ((r = manager_setup_signals(m)) < 0)
252 if ((r = manager_setup_cgroup(m)) < 0)
255 if ((r = manager_setup_notify(m)) < 0)
258 /* Try to connect to the busses, if possible. */
259 if ((r = bus_init(m)) < 0)
263 if ((m->audit_fd = audit_open()) < 0)
264 log_error("Failed to connect to audit log: %m");
275 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
281 while ((meta = m->cleanup_queue)) {
282 assert(meta->in_cleanup_queue);
284 unit_free((Unit*) meta);
292 GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */
293 GC_OFFSET_UNSURE, /* No clue */
294 GC_OFFSET_GOOD, /* We still need this unit */
295 GC_OFFSET_BAD, /* We don't need this unit anymore */
299 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
306 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
307 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
308 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
311 if (u->meta.in_cleanup_queue)
314 if (unit_check_gc(u))
317 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
321 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
322 unit_gc_sweep(other, gc_marker);
324 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
327 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
334 /* We were unable to find anything out about this entry, so
335 * let's investigate it later */
336 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
337 unit_add_to_gc_queue(u);
341 /* We definitely know that this one is not useful anymore, so
342 * let's mark it for deletion */
343 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
344 unit_add_to_cleanup_queue(u);
348 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
351 static unsigned manager_dispatch_gc_queue(Manager *m) {
358 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
359 (m->gc_queue_timestamp <= 0 ||
360 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
363 log_debug("Running GC...");
365 m->gc_marker += _GC_OFFSET_MAX;
366 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
369 gc_marker = m->gc_marker;
371 while ((meta = m->gc_queue)) {
372 assert(meta->in_gc_queue);
374 unit_gc_sweep((Unit*) meta, gc_marker);
376 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
377 meta->in_gc_queue = false;
381 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
382 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
383 log_debug("Collecting %s", meta->id);
384 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
385 unit_add_to_cleanup_queue((Unit*) meta);
389 m->n_in_gc_queue = 0;
390 m->gc_queue_timestamp = 0;
395 static void manager_clear_jobs_and_units(Manager *m) {
401 while ((j = hashmap_first(m->transaction_jobs)))
404 while ((u = hashmap_first(m->units)))
407 manager_dispatch_cleanup_queue(m);
409 assert(!m->load_queue);
410 assert(!m->run_queue);
411 assert(!m->dbus_unit_queue);
412 assert(!m->dbus_job_queue);
413 assert(!m->cleanup_queue);
414 assert(!m->gc_queue);
416 assert(hashmap_isempty(m->transaction_jobs));
417 assert(hashmap_isempty(m->jobs));
418 assert(hashmap_isempty(m->units));
421 void manager_free(Manager *m) {
426 manager_clear_jobs_and_units(m);
428 for (c = 0; c < _UNIT_TYPE_MAX; c++)
429 if (unit_vtable[c]->shutdown)
430 unit_vtable[c]->shutdown(m);
432 /* If we reexecute ourselves, we keep the root cgroup
434 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
438 hashmap_free(m->units);
439 hashmap_free(m->jobs);
440 hashmap_free(m->transaction_jobs);
441 hashmap_free(m->watch_pids);
442 hashmap_free(m->watch_bus);
444 if (m->epoll_fd >= 0)
445 close_nointr_nofail(m->epoll_fd);
446 if (m->signal_watch.fd >= 0)
447 close_nointr_nofail(m->signal_watch.fd);
448 if (m->notify_watch.fd >= 0)
449 close_nointr_nofail(m->notify_watch.fd);
452 if (m->audit_fd >= 0)
453 audit_close(m->audit_fd);
456 free(m->notify_socket);
459 lookup_paths_free(&m->lookup_paths);
460 strv_free(m->environment);
462 hashmap_free(m->cgroup_bondings);
463 set_free_free(m->unit_path_cache);
468 int manager_enumerate(Manager *m) {
474 /* Let's ask every type to load all units from disk/kernel
475 * that it might know */
476 for (c = 0; c < _UNIT_TYPE_MAX; c++)
477 if (unit_vtable[c]->enumerate)
478 if ((q = unit_vtable[c]->enumerate(m)) < 0)
481 manager_dispatch_load_queue(m);
485 int manager_coldplug(Manager *m) {
493 /* Then, let's set up their initial state. */
494 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
500 if ((q = unit_coldplug(u)) < 0)
507 static void manager_build_unit_path_cache(Manager *m) {
514 set_free_free(m->unit_path_cache);
516 if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
517 log_error("Failed to allocate unit path cache.");
521 /* This simply builds a list of files we know exist, so that
522 * we don't always have to go to disk */
524 STRV_FOREACH(i, m->lookup_paths.unit_path) {
527 if (!(d = opendir(*i))) {
528 log_error("Failed to open directory: %m");
532 while ((de = readdir(d))) {
535 if (ignore_file(de->d_name))
538 if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
543 if ((r = set_put(m->unit_path_cache, p)) < 0) {
556 log_error("Failed to build unit path cache: %s", strerror(-r));
558 set_free_free(m->unit_path_cache);
559 m->unit_path_cache = NULL;
565 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
570 manager_build_unit_path_cache(m);
572 /* If we will deserialize make sure that during enumeration
573 * this is already known, so we increase the counter here
576 m->n_deserializing ++;
578 /* First, enumerate what we can from all config files */
579 r = manager_enumerate(m);
581 /* Second, deserialize if there is something to deserialize */
583 if ((q = manager_deserialize(m, serialization, fds)) < 0)
586 /* Third, fire things up! */
587 if ((q = manager_coldplug(m)) < 0)
591 assert(m->n_deserializing > 0);
592 m->n_deserializing --;
598 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
602 /* Deletes one job from the transaction */
604 manager_transaction_unlink_job(m, j, delete_dependencies);
610 static void transaction_delete_unit(Manager *m, Unit *u) {
613 /* Deletes all jobs associated with a certain unit from the
616 while ((j = hashmap_get(m->transaction_jobs, u)))
617 transaction_delete_job(m, j, true);
620 static void transaction_clean_dependencies(Manager *m) {
626 /* Drops all dependencies of all installed jobs */
628 HASHMAP_FOREACH(j, m->jobs, i) {
629 while (j->subject_list)
630 job_dependency_free(j->subject_list);
631 while (j->object_list)
632 job_dependency_free(j->object_list);
635 assert(!m->transaction_anchor);
638 static void transaction_abort(Manager *m) {
643 while ((j = hashmap_first(m->transaction_jobs)))
645 transaction_delete_job(m, j, true);
649 assert(hashmap_isempty(m->transaction_jobs));
651 transaction_clean_dependencies(m);
654 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
659 /* A recursive sweep through the graph that marks all units
660 * that matter to the anchor job, i.e. are directly or
661 * indirectly a dependency of the anchor job via paths that
662 * are fully marked as mattering. */
667 l = m->transaction_anchor;
669 LIST_FOREACH(subject, l, l) {
671 /* This link does not matter */
675 /* This unit has already been marked */
676 if (l->object->generation == generation)
679 l->object->matters_to_anchor = true;
680 l->object->generation = generation;
682 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
686 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
687 JobDependency *l, *last;
691 assert(j->unit == other->unit);
692 assert(!j->installed);
694 /* Merges 'other' into 'j' and then deletes j. */
697 j->state = JOB_WAITING;
698 j->override = j->override || other->override;
700 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
702 /* Patch us in as new owner of the JobDependency objects */
704 LIST_FOREACH(subject, l, other->subject_list) {
705 assert(l->subject == other);
710 /* Merge both lists */
712 last->subject_next = j->subject_list;
714 j->subject_list->subject_prev = last;
715 j->subject_list = other->subject_list;
718 /* Patch us in as new owner of the JobDependency objects */
720 LIST_FOREACH(object, l, other->object_list) {
721 assert(l->object == other);
726 /* Merge both lists */
728 last->object_next = j->object_list;
730 j->object_list->object_prev = last;
731 j->object_list = other->object_list;
734 /* Kill the other job */
735 other->subject_list = NULL;
736 other->object_list = NULL;
737 transaction_delete_job(m, other, true);
739 static bool job_is_conflicted_by(Job *j) {
744 /* Returns true if this job is pulled in by a least one
745 * ConflictedBy dependency. */
747 LIST_FOREACH(object, l, j->object_list)
754 static int delete_one_unmergeable_job(Manager *m, Job *j) {
759 /* Tries to delete one item in the linked list
760 * j->transaction_next->transaction_next->... that conflicts
761 * whith another one, in an attempt to make an inconsistent
762 * transaction work. */
764 /* We rely here on the fact that if a merged with b does not
765 * merge with c, either a or b merge with c neither */
766 LIST_FOREACH(transaction, j, j)
767 LIST_FOREACH(transaction, k, j->transaction_next) {
770 /* Is this one mergeable? Then skip it */
771 if (job_type_is_mergeable(j->type, k->type))
774 /* Ok, we found two that conflict, let's see if we can
775 * drop one of them */
776 if (!j->matters_to_anchor && !k->matters_to_anchor) {
778 /* Both jobs don't matter, so let's
779 * find the one that is smarter to
780 * remove. Let's think positive and
781 * rather remove stops then starts --
782 * except if something is being
783 * stopped because it is conflicted by
784 * another unit in which case we
785 * rather remove the start. */
787 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)));
788 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)));
790 if (j->type == JOB_STOP) {
792 if (job_is_conflicted_by(j))
797 } else if (k->type == JOB_STOP) {
799 if (job_is_conflicted_by(k))
806 } else if (!j->matters_to_anchor)
808 else if (!k->matters_to_anchor)
813 /* Ok, we can drop one, so let's do so. */
814 log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
815 transaction_delete_job(m, d, true);
822 static int transaction_merge_jobs(Manager *m, DBusError *e) {
829 /* First step, check whether any of the jobs for one specific
830 * task conflict. If so, try to drop one of them. */
831 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
836 LIST_FOREACH(transaction, k, j->transaction_next) {
837 if (job_type_merge(&t, k->type) >= 0)
840 /* OK, we could not merge all jobs for this
841 * action. Let's see if we can get rid of one
844 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
845 /* Ok, we managed to drop one, now
846 * let's ask our callers to call us
847 * again after garbage collecting */
850 /* We couldn't merge anything. Failure */
851 dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
852 job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
857 /* Second step, merge the jobs. */
858 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
862 /* Merge all transactions */
863 LIST_FOREACH(transaction, k, j->transaction_next)
864 assert_se(job_type_merge(&t, k->type) == 0);
866 /* If an active job is mergeable, merge it too */
867 if (j->unit->meta.job)
868 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
870 while ((k = j->transaction_next)) {
872 transaction_merge_and_delete_job(m, k, j, t);
875 transaction_merge_and_delete_job(m, j, k, t);
878 assert(!j->transaction_next);
879 assert(!j->transaction_prev);
885 static void transaction_drop_redundant(Manager *m) {
890 /* Goes through the transaction and removes all jobs that are
899 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
900 bool changes_something = false;
903 LIST_FOREACH(transaction, k, j) {
905 if (!job_is_anchor(k) &&
906 job_type_is_redundant(k->type, unit_active_state(k->unit)))
909 changes_something = true;
913 if (changes_something)
916 log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
917 transaction_delete_job(m, j, false);
925 static bool unit_matters_to_anchor(Unit *u, Job *j) {
927 assert(!j->transaction_prev);
929 /* Checks whether at least one of the jobs for this unit
930 * matters to the anchor. */
932 LIST_FOREACH(transaction, j, j)
933 if (j->matters_to_anchor)
939 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
946 assert(!j->transaction_prev);
948 /* Does a recursive sweep through the ordering graph, looking
949 * for a cycle. If we find cycle we try to break it. */
951 /* Have we seen this before? */
952 if (j->generation == generation) {
955 /* If the marker is NULL we have been here already and
956 * decided the job was loop-free from here. Hence
957 * shortcut things and return right-away. */
961 /* So, the marker is not NULL and we already have been
962 * here. We have a cycle. Let's try to break it. We go
963 * backwards in our path and try to find a suitable
964 * job to remove. We use the marker to find our way
965 * back, since smart how we are we stored our way back
967 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
970 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
972 log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
976 !unit_matters_to_anchor(k->unit, k)) {
977 /* Ok, we can drop this one, so let's
982 /* Check if this in fact was the beginning of
990 log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
991 transaction_delete_unit(m, delete->unit);
995 log_error("Unable to break cycle");
997 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1001 /* Make the marker point to where we come from, so that we can
1002 * find our way backwards if we want to break a cycle. We use
1003 * a special marker for the beginning: we point to
1005 j->marker = from ? from : j;
1006 j->generation = generation;
1008 /* We assume that the the dependencies are bidirectional, and
1009 * hence can ignore UNIT_AFTER */
1010 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1013 /* Is there a job for this unit? */
1014 if (!(o = hashmap_get(m->transaction_jobs, u)))
1016 /* Ok, there is no job for this in the
1017 * transaction, but maybe there is already one
1019 if (!(o = u->meta.job))
1022 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1026 /* Ok, let's backtrack, and remember that this entry is not on
1027 * our path anymore. */
1033 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1042 /* Check if the ordering graph is cyclic. If it is, try to fix
1043 * that up by dropping one of the jobs. */
1045 g = (*generation)++;
1047 HASHMAP_FOREACH(j, m->transaction_jobs, i)
1048 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1054 static void transaction_collect_garbage(Manager *m) {
1059 /* Drop jobs that are not required by any other job */
1067 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1071 log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
1072 transaction_delete_job(m, j, true);
1080 static int transaction_is_destructive(Manager *m, DBusError *e) {
1086 /* Checks whether applying this transaction means that
1087 * existing jobs would be replaced */
1089 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1092 assert(!j->transaction_prev);
1093 assert(!j->transaction_next);
1095 if (j->unit->meta.job &&
1096 j->unit->meta.job != j &&
1097 !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1099 dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1107 static void transaction_minimize_impact(Manager *m) {
1111 /* Drops all unnecessary jobs that reverse already active jobs
1112 * or that stop a running service. */
1120 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1121 LIST_FOREACH(transaction, j, j) {
1122 bool stops_running_service, changes_existing_job;
1124 /* If it matters, we shouldn't drop it */
1125 if (j->matters_to_anchor)
1128 /* Would this stop a running service?
1129 * Would this change an existing job?
1130 * If so, let's drop this entry */
1132 stops_running_service =
1133 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1135 changes_existing_job =
1136 j->unit->meta.job &&
1137 job_type_is_conflicting(j->type, j->unit->meta.job->type);
1139 if (!stops_running_service && !changes_existing_job)
1142 if (stops_running_service)
1143 log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1145 if (changes_existing_job)
1146 log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1148 /* Ok, let's get rid of this */
1149 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1151 transaction_delete_job(m, j, true);
1163 static int transaction_apply(Manager *m) {
1168 /* Moves the transaction jobs to the set of active jobs */
1170 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1172 assert(!j->transaction_prev);
1173 assert(!j->transaction_next);
1178 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1182 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1186 if (j->unit->meta.job)
1187 job_free(j->unit->meta.job);
1189 j->unit->meta.job = j;
1190 j->installed = true;
1191 m->n_installed_jobs ++;
1193 /* We're fully installed. Now let's free data we don't
1196 assert(!j->transaction_next);
1197 assert(!j->transaction_prev);
1199 job_add_to_run_queue(j);
1200 job_add_to_dbus_queue(j);
1203 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1206 /* As last step, kill all remaining job dependencies. */
1207 transaction_clean_dependencies(m);
1213 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1217 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1223 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1225 unsigned generation = 1;
1229 /* This applies the changes recorded in transaction_jobs to
1230 * the actual list of jobs, if possible. */
1232 /* First step: figure out which jobs matter */
1233 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1235 /* Second step: Try not to stop any running services if
1236 * we don't have to. Don't try to reverse running
1237 * jobs if we don't have to. */
1238 if (mode == JOB_FAIL)
1239 transaction_minimize_impact(m);
1241 /* Third step: Drop redundant jobs */
1242 transaction_drop_redundant(m);
1245 /* Fourth step: Let's remove unneeded jobs that might
1247 transaction_collect_garbage(m);
1249 /* Fifth step: verify order makes sense and correct
1250 * cycles if necessary and possible */
1251 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1255 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1259 /* Let's see if the resulting transaction ordering
1260 * graph is still cyclic... */
1264 /* Sixth step: let's drop unmergeable entries if
1265 * necessary and possible, merge entries we can
1267 if ((r = transaction_merge_jobs(m, e)) >= 0)
1271 log_warning("Requested transaction contains unmergable jobs: %s", bus_error(e, r));
1275 /* Seventh step: an entry got dropped, let's garbage
1276 * collect its dependencies. */
1277 transaction_collect_garbage(m);
1279 /* Let's see if the resulting transaction still has
1280 * unmergeable entries ... */
1283 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1284 transaction_drop_redundant(m);
1286 /* Ninth step: check whether we can actually apply this */
1287 if (mode == JOB_FAIL)
1288 if ((r = transaction_is_destructive(m, e)) < 0) {
1289 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1293 /* Tenth step: apply changes */
1294 if ((r = transaction_apply(m)) < 0) {
1295 log_warning("Failed to apply transaction: %s", strerror(-r));
1299 assert(hashmap_isempty(m->transaction_jobs));
1300 assert(!m->transaction_anchor);
1305 transaction_abort(m);
1309 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1315 /* Looks for an axisting prospective job and returns that. If
1316 * it doesn't exist it is created and added to the prospective
1319 f = hashmap_get(m->transaction_jobs, unit);
1321 LIST_FOREACH(transaction, j, f) {
1322 assert(j->unit == unit);
1324 if (j->type == type) {
1331 if (unit->meta.job && unit->meta.job->type == type)
1333 else if (!(j = job_new(m, type, unit)))
1338 j->matters_to_anchor = false;
1339 j->override = override;
1341 LIST_PREPEND(Job, transaction, f, j);
1343 if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1351 log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1356 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1360 if (j->transaction_prev)
1361 j->transaction_prev->transaction_next = j->transaction_next;
1362 else if (j->transaction_next)
1363 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1365 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1367 if (j->transaction_next)
1368 j->transaction_next->transaction_prev = j->transaction_prev;
1370 j->transaction_prev = j->transaction_next = NULL;
1372 while (j->subject_list)
1373 job_dependency_free(j->subject_list);
1375 while (j->object_list) {
1376 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1378 job_dependency_free(j->object_list);
1380 if (other && delete_dependencies) {
1381 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1382 other->unit->meta.id, job_type_to_string(other->type),
1383 j->unit->meta.id, job_type_to_string(j->type));
1384 transaction_delete_job(m, other, delete_dependencies);
1389 static int transaction_add_job_and_dependencies(
1406 assert(type < _JOB_TYPE_MAX);
1409 if (unit->meta.load_state != UNIT_LOADED &&
1410 unit->meta.load_state != UNIT_ERROR &&
1411 unit->meta.load_state != UNIT_MASKED) {
1412 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1416 if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1417 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1418 "Unit %s failed to load: %s. "
1419 "See system logs and 'systemctl status' for details.",
1421 strerror(-unit->meta.load_error));
1425 if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1426 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1430 if (!unit_job_is_applicable(unit, type)) {
1431 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);
1435 /* First add the job. */
1436 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1439 /* Then, add a link to the job. */
1440 if (!job_dependency_new(by, ret, matters, conflicts))
1444 /* Finally, recursively add in all dependencies. */
1445 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1446 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1447 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
1450 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1451 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
1454 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1455 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, e, NULL)) < 0 && r != -EBADR) {
1456 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1462 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1463 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, e, NULL)) < 0) {
1464 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1470 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1471 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
1474 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1475 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, e, NULL)) < 0 && r != -EBADR) {
1476 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1482 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1483 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, e, NULL)) < 0 && r != -EBADR)
1486 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1487 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, e, NULL)) < 0 && r != -EBADR)
1490 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1492 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1493 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
1496 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1497 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, e, NULL)) < 0 && r != -EBADR)
1501 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1513 static int transaction_add_isolate_jobs(Manager *m) {
1521 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1523 /* ignore aliases */
1524 if (u->meta.id != k)
1527 if (UNIT_VTABLE(u)->no_isolate)
1530 /* No need to stop inactive jobs */
1531 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1534 /* Is there already something listed for this? */
1535 if (hashmap_get(m->transaction_jobs, u))
1538 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, NULL, NULL)) < 0)
1539 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1545 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1550 assert(type < _JOB_TYPE_MAX);
1552 assert(mode < _JOB_MODE_MAX);
1554 if (mode == JOB_ISOLATE && type != JOB_START) {
1555 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1559 if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1560 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1564 log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1566 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false, e, &ret)) < 0) {
1567 transaction_abort(m);
1571 if (mode == JOB_ISOLATE)
1572 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1573 transaction_abort(m);
1577 if ((r = transaction_activate(m, mode, e)) < 0)
1580 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1588 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1593 assert(type < _JOB_TYPE_MAX);
1595 assert(mode < _JOB_MODE_MAX);
1597 if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1600 return manager_add_job(m, type, unit, mode, override, e, _ret);
1603 Job *manager_get_job(Manager *m, uint32_t id) {
1606 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1609 Unit *manager_get_unit(Manager *m, const char *name) {
1613 return hashmap_get(m->units, name);
1616 unsigned manager_dispatch_load_queue(Manager *m) {
1622 /* Make sure we are not run recursively */
1623 if (m->dispatching_load_queue)
1626 m->dispatching_load_queue = true;
1628 /* Dispatches the load queue. Takes a unit from the queue and
1629 * tries to load its data until the queue is empty */
1631 while ((meta = m->load_queue)) {
1632 assert(meta->in_load_queue);
1634 unit_load((Unit*) meta);
1638 m->dispatching_load_queue = false;
1642 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1647 assert(name || path);
1649 /* This will prepare the unit for loading, but not actually
1650 * load anything from disk. */
1652 if (path && !is_path(path)) {
1653 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1658 name = file_name_from_path(path);
1660 if (!unit_name_is_valid(name, false)) {
1661 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1665 if ((ret = manager_get_unit(m, name))) {
1670 if (!(ret = unit_new(m)))
1674 if (!(ret->meta.fragment_path = strdup(path))) {
1679 if ((r = unit_add_name(ret, name)) < 0) {
1684 unit_add_to_load_queue(ret);
1685 unit_add_to_dbus_queue(ret);
1686 unit_add_to_gc_queue(ret);
1694 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1699 /* This will load the service information files, but not actually
1700 * start any services or anything. */
1702 if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1705 manager_dispatch_load_queue(m);
1708 *_ret = unit_follow_merge(*_ret);
1713 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1720 HASHMAP_FOREACH(j, s->jobs, i)
1721 job_dump(j, f, prefix);
1724 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1732 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1733 if (u->meta.id == t)
1734 unit_dump(u, f, prefix);
1737 void manager_clear_jobs(Manager *m) {
1742 transaction_abort(m);
1744 while ((j = hashmap_first(m->jobs)))
1748 unsigned manager_dispatch_run_queue(Manager *m) {
1752 if (m->dispatching_run_queue)
1755 m->dispatching_run_queue = true;
1757 while ((j = m->run_queue)) {
1758 assert(j->installed);
1759 assert(j->in_run_queue);
1761 job_run_and_invalidate(j);
1765 m->dispatching_run_queue = false;
1769 unsigned manager_dispatch_dbus_queue(Manager *m) {
1776 if (m->dispatching_dbus_queue)
1779 m->dispatching_dbus_queue = true;
1781 while ((meta = m->dbus_unit_queue)) {
1782 assert(meta->in_dbus_queue);
1784 bus_unit_send_change_signal((Unit*) meta);
1788 while ((j = m->dbus_job_queue)) {
1789 assert(j->in_dbus_queue);
1791 bus_job_send_change_signal(j);
1795 m->dispatching_dbus_queue = false;
1799 static int manager_process_notify_fd(Manager *m) {
1806 struct msghdr msghdr;
1808 struct ucred *ucred;
1810 struct cmsghdr cmsghdr;
1811 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1817 iovec.iov_base = buf;
1818 iovec.iov_len = sizeof(buf)-1;
1822 msghdr.msg_iov = &iovec;
1823 msghdr.msg_iovlen = 1;
1824 msghdr.msg_control = &control;
1825 msghdr.msg_controllen = sizeof(control);
1827 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1831 if (errno == EAGAIN || errno == EINTR)
1837 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1838 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1839 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1840 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1841 log_warning("Received notify message without credentials. Ignoring.");
1845 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1847 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1848 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1849 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1853 assert((size_t) n < sizeof(buf));
1855 if (!(tags = strv_split(buf, "\n\r")))
1858 log_debug("Got notification message for unit %s", u->meta.id);
1860 if (UNIT_VTABLE(u)->notify_message)
1861 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1869 static int manager_dispatch_sigchld(Manager *m) {
1879 /* First we call waitd() for a PID and do not reap the
1880 * zombie. That way we can still access /proc/$PID for
1881 * it while it is a zombie. */
1882 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1884 if (errno == ECHILD)
1896 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1899 get_process_name(si.si_pid, &name);
1900 log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1904 /* Let's flush any message the dying child might still
1905 * have queued for us. This ensures that the process
1906 * still exists in /proc so that we can figure out
1907 * which cgroup and hence unit it belongs to. */
1908 if ((r = manager_process_notify_fd(m)) < 0)
1911 /* And now figure out the unit this belongs to */
1912 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
1913 u = cgroup_unit_by_pid(m, si.si_pid);
1915 /* And now, we actually reap the zombie. */
1916 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1923 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1926 log_debug("Child %lu died (code=%s, status=%i/%s)",
1927 (long unsigned) si.si_pid,
1928 sigchld_code_to_string(si.si_code),
1930 strna(si.si_code == CLD_EXITED
1931 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
1932 : signal_to_string(si.si_status)));
1937 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
1939 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
1940 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1946 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
1950 dbus_error_init(&error);
1952 log_info("Activating special unit %s", name);
1954 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
1955 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
1957 dbus_error_free(&error);
1962 static int manager_process_signal_fd(Manager *m) {
1964 struct signalfd_siginfo sfsi;
1965 bool sigchld = false;
1970 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1975 if (errno == EINTR || errno == EAGAIN)
1981 log_debug("Received SIG%s", strna(signal_to_string(sfsi.ssi_signo)));
1983 switch (sfsi.ssi_signo) {
1990 if (m->running_as == MANAGER_SYSTEM) {
1991 /* This is for compatibility with the
1992 * original sysvinit */
1993 m->exit_code = MANAGER_REEXECUTE;
2000 if (m->running_as == MANAGER_SYSTEM) {
2001 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2005 /* Run the exit target if there is one, if not, just exit. */
2006 if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2007 m->exit_code = MANAGER_EXIT;
2014 if (m->running_as == MANAGER_SYSTEM)
2015 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2017 /* This is a nop on non-init */
2021 if (m->running_as == MANAGER_SYSTEM)
2022 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2024 /* This is a nop on non-init */
2030 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2032 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2033 log_info("Trying to reconnect to bus...");
2037 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2038 log_info("Loading D-Bus service...");
2039 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2050 if (!(f = open_memstream(&dump, &size))) {
2051 log_warning("Failed to allocate memory stream.");
2055 manager_dump_units(m, f, "\t");
2056 manager_dump_jobs(m, f, "\t");
2061 log_warning("Failed to write status stream");
2066 log_dump(LOG_INFO, dump);
2073 m->exit_code = MANAGER_RELOAD;
2077 /* Starting SIGRTMIN+0 */
2078 static const char * const target_table[] = {
2079 [0] = SPECIAL_DEFAULT_TARGET,
2080 [1] = SPECIAL_RESCUE_TARGET,
2081 [2] = SPECIAL_EMERGENCY_TARGET,
2082 [3] = SPECIAL_HALT_TARGET,
2083 [4] = SPECIAL_POWEROFF_TARGET,
2084 [5] = SPECIAL_REBOOT_TARGET,
2085 [6] = SPECIAL_KEXEC_TARGET
2088 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2089 static const ManagerExitCode code_table[] = {
2091 [1] = MANAGER_POWEROFF,
2092 [2] = MANAGER_REBOOT,
2096 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2097 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2098 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2099 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2103 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2104 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2105 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2109 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2115 return manager_dispatch_sigchld(m);
2120 static int process_event(Manager *m, struct epoll_event *ev) {
2127 assert(w = ev->data.ptr);
2133 /* An incoming signal? */
2134 if (ev->events != EPOLLIN)
2137 if ((r = manager_process_signal_fd(m)) < 0)
2144 /* An incoming daemon notification event? */
2145 if (ev->events != EPOLLIN)
2148 if ((r = manager_process_notify_fd(m)) < 0)
2155 /* Some fd event, to be dispatched to the units */
2156 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2159 case WATCH_UNIT_TIMER:
2160 case WATCH_JOB_TIMER: {
2164 /* Some timer event, to be dispatched to the units */
2165 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2167 if (k < 0 && (errno == EINTR || errno == EAGAIN))
2170 return k < 0 ? -errno : -EIO;
2173 if (w->type == WATCH_UNIT_TIMER)
2174 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2176 job_timer_event(w->data.job, v, w);
2181 /* Some mount table change, intended for the mount subsystem */
2182 mount_fd_event(m, ev->events);
2186 /* Some swap table change, intended for the swap subsystem */
2187 swap_fd_event(m, ev->events);
2191 /* Some notification from udev, intended for the device subsystem */
2192 device_fd_event(m, ev->events);
2195 case WATCH_DBUS_WATCH:
2196 bus_watch_event(m, w, ev->events);
2199 case WATCH_DBUS_TIMEOUT:
2200 bus_timeout_event(m, w, ev->events);
2204 assert_not_reached("Unknown epoll event type.");
2210 int manager_loop(Manager *m) {
2213 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
2216 m->exit_code = MANAGER_RUNNING;
2218 /* Release the path cache */
2219 set_free_free(m->unit_path_cache);
2220 m->unit_path_cache = NULL;
2222 manager_check_finished(m);
2224 /* There might still be some zombies hanging around from
2225 * before we were exec()'ed. Leat's reap them */
2226 if ((r = manager_dispatch_sigchld(m)) < 0)
2229 while (m->exit_code == MANAGER_RUNNING) {
2230 struct epoll_event event;
2233 if (!ratelimit_test(&rl)) {
2234 /* Yay, something is going seriously wrong, pause a little */
2235 log_warning("Looping too fast. Throttling execution a little.");
2239 if (manager_dispatch_load_queue(m) > 0)
2242 if (manager_dispatch_run_queue(m) > 0)
2245 if (bus_dispatch(m) > 0)
2248 if (manager_dispatch_cleanup_queue(m) > 0)
2251 if (manager_dispatch_gc_queue(m) > 0)
2254 if (manager_dispatch_dbus_queue(m) > 0)
2257 if (swap_dispatch_reload(m) > 0)
2260 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2270 if ((r = process_event(m, &event)) < 0)
2274 return m->exit_code;
2277 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2285 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2288 if (!(n = bus_path_unescape(s+31)))
2291 u = manager_get_unit(m, n);
2302 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2311 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2314 if ((r = safe_atou(s + 30, &id)) < 0)
2317 if (!(j = manager_get_job(m, id)))
2325 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2330 if (m->audit_fd < 0)
2333 /* Don't generate audit events if the service was already
2334 * started and we're just deserializing */
2335 if (m->n_deserializing > 0)
2338 if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2339 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2343 if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0)
2344 log_error("Failed to send audit message: %m");
2351 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2353 union sockaddr_union sa;
2355 char *message = NULL;
2358 /* Don't generate plymouth events if the service was already
2359 * started and we're just deserializing */
2360 if (m->n_deserializing > 0)
2363 if (m->running_as != MANAGER_SYSTEM)
2366 if (u->meta.type != UNIT_SERVICE &&
2367 u->meta.type != UNIT_MOUNT &&
2368 u->meta.type != UNIT_SWAP)
2371 /* We set SOCK_NONBLOCK here so that we rather drop the
2372 * message then wait for plymouth */
2373 if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2374 log_error("socket() failed: %m");
2379 sa.sa.sa_family = AF_UNIX;
2380 strncpy(sa.un.sun_path+1, "/ply-boot-protocol", sizeof(sa.un.sun_path)-1);
2381 if (connect(fd, &sa.sa, sizeof(sa.un)) < 0) {
2383 if (errno != EPIPE &&
2386 errno != ECONNREFUSED &&
2387 errno != ECONNRESET &&
2388 errno != ECONNABORTED)
2389 log_error("connect() failed: %m");
2394 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2395 log_error("Out of memory");
2400 if ((r = write(fd, message, n + 1)) != n + 1) {
2402 if (errno != EPIPE &&
2405 errno != ECONNREFUSED &&
2406 errno != ECONNRESET &&
2407 errno != ECONNABORTED)
2408 log_error("Failed to write Plymouth message: %m");
2415 close_nointr_nofail(fd);
2420 void manager_dispatch_bus_name_owner_changed(
2423 const char* old_owner,
2424 const char *new_owner) {
2431 if (!(u = hashmap_get(m->watch_bus, name)))
2434 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2437 void manager_dispatch_bus_query_pid_done(
2448 if (!(u = hashmap_get(m->watch_bus, name)))
2451 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2454 int manager_open_serialization(Manager *m, FILE **_f) {
2462 if (m->running_as == MANAGER_SYSTEM) {
2463 mkdir_p("/dev/.systemd", 0755);
2465 if (asprintf(&path, "/dev/.systemd/dump-%lu-XXXXXX", (unsigned long) getpid()) < 0)
2468 if (asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid()) < 0)
2472 saved_umask = umask(0077);
2473 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2483 log_debug("Serializing state to %s", path);
2486 if (!(f = fdopen(fd, "w+")) < 0)
2494 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2504 dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2505 dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2506 dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2510 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2511 if (u->meta.id != t)
2514 if (!unit_can_serialize(u))
2518 fputs(u->meta.id, f);
2521 if ((r = unit_serialize(u, f, fds)) < 0)
2531 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2537 log_debug("Deserializing state...");
2539 m->n_deserializing ++;
2542 char line[1024], *l;
2544 if (!fgets(line, sizeof(line), f)) {
2559 if (startswith(l, "initrd-timestamp="))
2560 dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2561 else if (startswith(l, "startup-timestamp="))
2562 dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2563 else if (startswith(l, "finish-timestamp="))
2564 dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2566 log_debug("Unknown serialization item '%s'", l);
2571 char name[UNIT_NAME_MAX+2];
2574 if (!fgets(name, sizeof(name), f)) {
2585 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2588 if ((r = unit_deserialize(u, f, fds)) < 0)
2598 assert(m->n_deserializing > 0);
2599 m->n_deserializing --;
2604 int manager_reload(Manager *m) {
2611 if ((r = manager_open_serialization(m, &f)) < 0)
2614 if (!(fds = fdset_new())) {
2619 if ((r = manager_serialize(m, f, fds)) < 0)
2622 if (fseeko(f, 0, SEEK_SET) < 0) {
2627 /* From here on there is no way back. */
2628 manager_clear_jobs_and_units(m);
2630 /* Find new unit paths */
2631 lookup_paths_free(&m->lookup_paths);
2632 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2635 m->n_deserializing ++;
2637 /* First, enumerate what we can from all config files */
2638 if ((q = manager_enumerate(m)) < 0)
2641 /* Second, deserialize our stored data */
2642 if ((q = manager_deserialize(m, f, fds)) < 0)
2648 /* Third, fire things up! */
2649 if ((q = manager_coldplug(m)) < 0)
2652 assert(m->n_deserializing > 0);
2653 m->n_deserializing ++;
2665 bool manager_is_booting_or_shutting_down(Manager *m) {
2670 /* Is the initial job still around? */
2671 if (manager_get_job(m, 1))
2674 /* Is there a job for the shutdown target? */
2675 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2676 return !!u->meta.job;
2681 void manager_reset_failed(Manager *m) {
2687 HASHMAP_FOREACH(u, m->units, i)
2688 unit_reset_failed(u);
2691 int manager_set_console(Manager *m, const char *console) {
2696 if (!(c = strdup(console)))
2702 log_debug("Using kernel console %s", c);
2707 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2713 /* Returns true if the unit is inactive or going down */
2714 if (!(u = manager_get_unit(m, name)))
2717 return unit_pending_inactive(u);
2720 void manager_check_finished(Manager *m) {
2721 char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2725 if (dual_timestamp_is_set(&m->finish_timestamp))
2728 if (hashmap_size(m->jobs) > 0)
2731 dual_timestamp_get(&m->finish_timestamp);
2733 if (m->running_as == MANAGER_SYSTEM) {
2734 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2735 log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2736 format_timespan(kernel, sizeof(kernel),
2737 m->initrd_timestamp.monotonic),
2738 format_timespan(initrd, sizeof(initrd),
2739 m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2740 format_timespan(userspace, sizeof(userspace),
2741 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2742 format_timespan(sum, sizeof(sum),
2743 m->finish_timestamp.monotonic));
2745 log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2746 format_timespan(kernel, sizeof(kernel),
2747 m->startup_timestamp.monotonic),
2748 format_timespan(userspace, sizeof(userspace),
2749 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2750 format_timespan(sum, sizeof(sum),
2751 m->finish_timestamp.monotonic));
2753 log_debug("Startup finished in %s.",
2754 format_timespan(userspace, sizeof(userspace),
2755 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2759 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2760 [MANAGER_SYSTEM] = "system",
2761 [MANAGER_SESSION] = "session"
2764 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);