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_SYSTEM "/run/systemd/notify"
70 #define NOTIFY_SOCKET_USER "@/org/freedesktop/systemd1/notify"
72 static int manager_setup_notify(Manager *m) {
75 struct sockaddr_un un;
77 struct epoll_event ev;
82 m->notify_watch.type = WATCH_NOTIFY;
83 if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
84 log_error("Failed to allocate notification socket: %m");
89 sa.sa.sa_family = AF_UNIX;
92 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET_USER "/%llu", random_ull());
94 unlink(NOTIFY_SOCKET_SYSTEM);
95 strncpy(sa.un.sun_path, NOTIFY_SOCKET_SYSTEM, sizeof(sa.un.sun_path));
98 if (sa.un.sun_path[0] == '@')
99 sa.un.sun_path[0] = 0;
101 if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
102 log_error("bind() failed: %m");
106 if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
107 log_error("SO_PASSCRED failed: %m");
113 ev.data.ptr = &m->notify_watch;
115 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
118 if (sa.un.sun_path[0] == 0)
119 sa.un.sun_path[0] = '@';
121 if (!(m->notify_socket = strdup(sa.un.sun_path)))
124 log_debug("Using notification socket %s", m->notify_socket);
129 static int enable_special_signals(Manager *m) {
134 /* Enable that we get SIGINT on control-alt-del */
135 if (reboot(RB_DISABLE_CAD) < 0)
136 log_warning("Failed to enable ctrl-alt-del handling: %m");
138 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
139 log_warning("Failed to open /dev/tty0: %m");
141 /* Enable that we get SIGWINCH on kbrequest */
142 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
143 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
145 close_nointr_nofail(fd);
151 static int manager_setup_signals(Manager *m) {
153 struct epoll_event ev;
158 /* We are not interested in SIGSTOP and friends. */
160 sa.sa_handler = SIG_DFL;
161 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
162 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
164 assert_se(sigemptyset(&mask) == 0);
166 sigset_add_many(&mask,
167 SIGCHLD, /* Child died */
168 SIGTERM, /* Reexecute daemon */
169 SIGHUP, /* Reload configuration */
170 SIGUSR1, /* systemd/upstart: reconnect to D-Bus */
171 SIGUSR2, /* systemd: dump status */
172 SIGINT, /* Kernel sends us this on control-alt-del */
173 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
174 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
175 SIGRTMIN+0, /* systemd: start default.target */
176 SIGRTMIN+1, /* systemd: isolate rescue.target */
177 SIGRTMIN+2, /* systemd: isolate emergency.target */
178 SIGRTMIN+3, /* systemd: start halt.target */
179 SIGRTMIN+4, /* systemd: start poweroff.target */
180 SIGRTMIN+5, /* systemd: start reboot.target */
181 SIGRTMIN+6, /* systemd: start kexec.target */
182 SIGRTMIN+13, /* systemd: Immediate halt */
183 SIGRTMIN+14, /* systemd: Immediate poweroff */
184 SIGRTMIN+15, /* systemd: Immediate reboot */
185 SIGRTMIN+16, /* systemd: Immediate kexec */
186 SIGRTMIN+20, /* systemd: enable status messages */
187 SIGRTMIN+21, /* systemd: disable status messages */
189 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
191 m->signal_watch.type = WATCH_SIGNAL;
192 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
197 ev.data.ptr = &m->signal_watch;
199 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
202 if (m->running_as == MANAGER_SYSTEM)
203 return enable_special_signals(m);
208 int manager_new(ManagerRunningAs running_as, Manager **_m) {
213 assert(running_as >= 0);
214 assert(running_as < _MANAGER_RUNNING_AS_MAX);
216 if (!(m = new0(Manager, 1)))
219 dual_timestamp_get(&m->startup_timestamp);
221 m->running_as = running_as;
222 m->name_data_slot = m->subscribed_data_slot = -1;
223 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
224 m->pin_cgroupfs_fd = -1;
230 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
231 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
233 if (!(m->environment = strv_copy(environ)))
236 if (!(m->default_controllers = strv_new("cpu", NULL)))
239 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
242 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
245 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
248 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
251 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
254 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
257 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
260 if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
263 if ((r = manager_setup_signals(m)) < 0)
266 if ((r = manager_setup_cgroup(m)) < 0)
269 if ((r = manager_setup_notify(m)) < 0)
272 /* Try to connect to the busses, if possible. */
273 if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
277 if ((m->audit_fd = audit_open()) < 0)
278 log_error("Failed to connect to audit log: %m");
281 m->taint_usr = dir_is_empty("/usr") > 0;
291 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
297 while ((meta = m->cleanup_queue)) {
298 assert(meta->in_cleanup_queue);
300 unit_free((Unit*) meta);
308 GC_OFFSET_IN_PATH, /* This one is on the path we were traveling */
309 GC_OFFSET_UNSURE, /* No clue */
310 GC_OFFSET_GOOD, /* We still need this unit */
311 GC_OFFSET_BAD, /* We don't need this unit anymore */
315 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
322 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
323 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
324 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
327 if (u->meta.in_cleanup_queue)
330 if (unit_check_gc(u))
333 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
337 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
338 unit_gc_sweep(other, gc_marker);
340 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
343 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
350 /* We were unable to find anything out about this entry, so
351 * let's investigate it later */
352 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
353 unit_add_to_gc_queue(u);
357 /* We definitely know that this one is not useful anymore, so
358 * let's mark it for deletion */
359 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
360 unit_add_to_cleanup_queue(u);
364 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
367 static unsigned manager_dispatch_gc_queue(Manager *m) {
374 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
375 (m->gc_queue_timestamp <= 0 ||
376 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
379 log_debug("Running GC...");
381 m->gc_marker += _GC_OFFSET_MAX;
382 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
385 gc_marker = m->gc_marker;
387 while ((meta = m->gc_queue)) {
388 assert(meta->in_gc_queue);
390 unit_gc_sweep((Unit*) meta, gc_marker);
392 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
393 meta->in_gc_queue = false;
397 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
398 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
399 log_debug("Collecting %s", meta->id);
400 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
401 unit_add_to_cleanup_queue((Unit*) meta);
405 m->n_in_gc_queue = 0;
406 m->gc_queue_timestamp = 0;
411 static void manager_clear_jobs_and_units(Manager *m) {
417 while ((j = hashmap_first(m->transaction_jobs)))
420 while ((u = hashmap_first(m->units)))
423 manager_dispatch_cleanup_queue(m);
425 assert(!m->load_queue);
426 assert(!m->run_queue);
427 assert(!m->dbus_unit_queue);
428 assert(!m->dbus_job_queue);
429 assert(!m->cleanup_queue);
430 assert(!m->gc_queue);
432 assert(hashmap_isempty(m->transaction_jobs));
433 assert(hashmap_isempty(m->jobs));
434 assert(hashmap_isempty(m->units));
437 void manager_free(Manager *m) {
442 manager_clear_jobs_and_units(m);
444 for (c = 0; c < _UNIT_TYPE_MAX; c++)
445 if (unit_vtable[c]->shutdown)
446 unit_vtable[c]->shutdown(m);
448 /* If we reexecute ourselves, we keep the root cgroup
450 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
452 manager_undo_generators(m);
456 hashmap_free(m->units);
457 hashmap_free(m->jobs);
458 hashmap_free(m->transaction_jobs);
459 hashmap_free(m->watch_pids);
460 hashmap_free(m->watch_bus);
462 if (m->epoll_fd >= 0)
463 close_nointr_nofail(m->epoll_fd);
464 if (m->signal_watch.fd >= 0)
465 close_nointr_nofail(m->signal_watch.fd);
466 if (m->notify_watch.fd >= 0)
467 close_nointr_nofail(m->notify_watch.fd);
470 if (m->audit_fd >= 0)
471 audit_close(m->audit_fd);
474 free(m->notify_socket);
476 lookup_paths_free(&m->lookup_paths);
477 strv_free(m->environment);
479 strv_free(m->default_controllers);
481 hashmap_free(m->cgroup_bondings);
482 set_free_free(m->unit_path_cache);
487 int manager_enumerate(Manager *m) {
493 /* Let's ask every type to load all units from disk/kernel
494 * that it might know */
495 for (c = 0; c < _UNIT_TYPE_MAX; c++)
496 if (unit_vtable[c]->enumerate)
497 if ((q = unit_vtable[c]->enumerate(m)) < 0)
500 manager_dispatch_load_queue(m);
504 int manager_coldplug(Manager *m) {
512 /* Then, let's set up their initial state. */
513 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
519 if ((q = unit_coldplug(u)) < 0)
526 static void manager_build_unit_path_cache(Manager *m) {
533 set_free_free(m->unit_path_cache);
535 if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
536 log_error("Failed to allocate unit path cache.");
540 /* This simply builds a list of files we know exist, so that
541 * we don't always have to go to disk */
543 STRV_FOREACH(i, m->lookup_paths.unit_path) {
546 if (!(d = opendir(*i))) {
547 log_error("Failed to open directory: %m");
551 while ((de = readdir(d))) {
554 if (ignore_file(de->d_name))
557 if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
562 if ((r = set_put(m->unit_path_cache, p)) < 0) {
575 log_error("Failed to build unit path cache: %s", strerror(-r));
577 set_free_free(m->unit_path_cache);
578 m->unit_path_cache = NULL;
584 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
589 manager_run_generators(m);
591 manager_build_unit_path_cache(m);
593 /* If we will deserialize make sure that during enumeration
594 * this is already known, so we increase the counter here
597 m->n_deserializing ++;
599 /* First, enumerate what we can from all config files */
600 r = manager_enumerate(m);
602 /* Second, deserialize if there is something to deserialize */
604 if ((q = manager_deserialize(m, serialization, fds)) < 0)
607 /* Third, fire things up! */
608 if ((q = manager_coldplug(m)) < 0)
612 assert(m->n_deserializing > 0);
613 m->n_deserializing --;
619 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
623 /* Deletes one job from the transaction */
625 manager_transaction_unlink_job(m, j, delete_dependencies);
631 static void transaction_delete_unit(Manager *m, Unit *u) {
634 /* Deletes all jobs associated with a certain unit from the
637 while ((j = hashmap_get(m->transaction_jobs, u)))
638 transaction_delete_job(m, j, true);
641 static void transaction_clean_dependencies(Manager *m) {
647 /* Drops all dependencies of all installed jobs */
649 HASHMAP_FOREACH(j, m->jobs, i) {
650 while (j->subject_list)
651 job_dependency_free(j->subject_list);
652 while (j->object_list)
653 job_dependency_free(j->object_list);
656 assert(!m->transaction_anchor);
659 static void transaction_abort(Manager *m) {
664 while ((j = hashmap_first(m->transaction_jobs)))
666 transaction_delete_job(m, j, true);
670 assert(hashmap_isempty(m->transaction_jobs));
672 transaction_clean_dependencies(m);
675 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
680 /* A recursive sweep through the graph that marks all units
681 * that matter to the anchor job, i.e. are directly or
682 * indirectly a dependency of the anchor job via paths that
683 * are fully marked as mattering. */
688 l = m->transaction_anchor;
690 LIST_FOREACH(subject, l, l) {
692 /* This link does not matter */
696 /* This unit has already been marked */
697 if (l->object->generation == generation)
700 l->object->matters_to_anchor = true;
701 l->object->generation = generation;
703 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
707 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
708 JobDependency *l, *last;
712 assert(j->unit == other->unit);
713 assert(!j->installed);
715 /* Merges 'other' into 'j' and then deletes j. */
718 j->state = JOB_WAITING;
719 j->override = j->override || other->override;
721 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
723 /* Patch us in as new owner of the JobDependency objects */
725 LIST_FOREACH(subject, l, other->subject_list) {
726 assert(l->subject == other);
731 /* Merge both lists */
733 last->subject_next = j->subject_list;
735 j->subject_list->subject_prev = last;
736 j->subject_list = other->subject_list;
739 /* Patch us in as new owner of the JobDependency objects */
741 LIST_FOREACH(object, l, other->object_list) {
742 assert(l->object == other);
747 /* Merge both lists */
749 last->object_next = j->object_list;
751 j->object_list->object_prev = last;
752 j->object_list = other->object_list;
755 /* Kill the other job */
756 other->subject_list = NULL;
757 other->object_list = NULL;
758 transaction_delete_job(m, other, true);
760 static bool job_is_conflicted_by(Job *j) {
765 /* Returns true if this job is pulled in by a least one
766 * ConflictedBy dependency. */
768 LIST_FOREACH(object, l, j->object_list)
775 static int delete_one_unmergeable_job(Manager *m, Job *j) {
780 /* Tries to delete one item in the linked list
781 * j->transaction_next->transaction_next->... that conflicts
782 * with another one, in an attempt to make an inconsistent
783 * transaction work. */
785 /* We rely here on the fact that if a merged with b does not
786 * merge with c, either a or b merge with c neither */
787 LIST_FOREACH(transaction, j, j)
788 LIST_FOREACH(transaction, k, j->transaction_next) {
791 /* Is this one mergeable? Then skip it */
792 if (job_type_is_mergeable(j->type, k->type))
795 /* Ok, we found two that conflict, let's see if we can
796 * drop one of them */
797 if (!j->matters_to_anchor && !k->matters_to_anchor) {
799 /* Both jobs don't matter, so let's
800 * find the one that is smarter to
801 * remove. Let's think positive and
802 * rather remove stops then starts --
803 * except if something is being
804 * stopped because it is conflicted by
805 * another unit in which case we
806 * rather remove the start. */
808 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)));
809 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)));
811 if (j->type == JOB_STOP) {
813 if (job_is_conflicted_by(j))
818 } else if (k->type == JOB_STOP) {
820 if (job_is_conflicted_by(k))
827 } else if (!j->matters_to_anchor)
829 else if (!k->matters_to_anchor)
834 /* Ok, we can drop one, so let's do so. */
835 log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
836 transaction_delete_job(m, d, true);
843 static int transaction_merge_jobs(Manager *m, DBusError *e) {
850 /* First step, check whether any of the jobs for one specific
851 * task conflict. If so, try to drop one of them. */
852 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
857 LIST_FOREACH(transaction, k, j->transaction_next) {
858 if (job_type_merge(&t, k->type) >= 0)
861 /* OK, we could not merge all jobs for this
862 * action. Let's see if we can get rid of one
865 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
866 /* Ok, we managed to drop one, now
867 * let's ask our callers to call us
868 * again after garbage collecting */
871 /* We couldn't merge anything. Failure */
872 dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
873 job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
878 /* Second step, merge the jobs. */
879 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
883 /* Merge all transactions */
884 LIST_FOREACH(transaction, k, j->transaction_next)
885 assert_se(job_type_merge(&t, k->type) == 0);
887 /* If an active job is mergeable, merge it too */
888 if (j->unit->meta.job)
889 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
891 while ((k = j->transaction_next)) {
893 transaction_merge_and_delete_job(m, k, j, t);
896 transaction_merge_and_delete_job(m, j, k, t);
899 assert(!j->transaction_next);
900 assert(!j->transaction_prev);
906 static void transaction_drop_redundant(Manager *m) {
911 /* Goes through the transaction and removes all jobs that are
920 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
921 bool changes_something = false;
924 LIST_FOREACH(transaction, k, j) {
926 if (!job_is_anchor(k) &&
927 (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
928 (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
931 changes_something = true;
935 if (changes_something)
938 /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
939 transaction_delete_job(m, j, false);
947 static bool unit_matters_to_anchor(Unit *u, Job *j) {
949 assert(!j->transaction_prev);
951 /* Checks whether at least one of the jobs for this unit
952 * matters to the anchor. */
954 LIST_FOREACH(transaction, j, j)
955 if (j->matters_to_anchor)
961 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
968 assert(!j->transaction_prev);
970 /* Does a recursive sweep through the ordering graph, looking
971 * for a cycle. If we find cycle we try to break it. */
973 /* Have we seen this before? */
974 if (j->generation == generation) {
977 /* If the marker is NULL we have been here already and
978 * decided the job was loop-free from here. Hence
979 * shortcut things and return right-away. */
983 /* So, the marker is not NULL and we already have been
984 * here. We have a cycle. Let's try to break it. We go
985 * backwards in our path and try to find a suitable
986 * job to remove. We use the marker to find our way
987 * back, since smart how we are we stored our way back
989 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
992 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
994 log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
998 !unit_matters_to_anchor(k->unit, k)) {
999 /* Ok, we can drop this one, so let's
1004 /* Check if this in fact was the beginning of
1012 log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1013 transaction_delete_unit(m, delete->unit);
1017 log_error("Unable to break cycle");
1019 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1023 /* Make the marker point to where we come from, so that we can
1024 * find our way backwards if we want to break a cycle. We use
1025 * a special marker for the beginning: we point to
1027 j->marker = from ? from : j;
1028 j->generation = generation;
1030 /* We assume that the the dependencies are bidirectional, and
1031 * hence can ignore UNIT_AFTER */
1032 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1035 /* Is there a job for this unit? */
1036 if (!(o = hashmap_get(m->transaction_jobs, u)))
1038 /* Ok, there is no job for this in the
1039 * transaction, but maybe there is already one
1041 if (!(o = u->meta.job))
1044 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1048 /* Ok, let's backtrack, and remember that this entry is not on
1049 * our path anymore. */
1055 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1064 /* Check if the ordering graph is cyclic. If it is, try to fix
1065 * that up by dropping one of the jobs. */
1067 g = (*generation)++;
1069 HASHMAP_FOREACH(j, m->transaction_jobs, i)
1070 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1076 static void transaction_collect_garbage(Manager *m) {
1081 /* Drop jobs that are not required by any other job */
1089 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1090 if (j->object_list) {
1091 /* log_debug("Keeping job %s/%s because of %s/%s", */
1092 /* j->unit->meta.id, job_type_to_string(j->type), */
1093 /* j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1094 /* j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1098 /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1099 transaction_delete_job(m, j, true);
1107 static int transaction_is_destructive(Manager *m, DBusError *e) {
1113 /* Checks whether applying this transaction means that
1114 * existing jobs would be replaced */
1116 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1119 assert(!j->transaction_prev);
1120 assert(!j->transaction_next);
1122 if (j->unit->meta.job &&
1123 j->unit->meta.job != j &&
1124 !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1126 dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1134 static void transaction_minimize_impact(Manager *m) {
1138 /* Drops all unnecessary jobs that reverse already active jobs
1139 * or that stop a running service. */
1147 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1148 LIST_FOREACH(transaction, j, j) {
1149 bool stops_running_service, changes_existing_job;
1151 /* If it matters, we shouldn't drop it */
1152 if (j->matters_to_anchor)
1155 /* Would this stop a running service?
1156 * Would this change an existing job?
1157 * If so, let's drop this entry */
1159 stops_running_service =
1160 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1162 changes_existing_job =
1163 j->unit->meta.job &&
1164 job_type_is_conflicting(j->type, j->unit->meta.job->type);
1166 if (!stops_running_service && !changes_existing_job)
1169 if (stops_running_service)
1170 log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1172 if (changes_existing_job)
1173 log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1175 /* Ok, let's get rid of this */
1176 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1178 transaction_delete_job(m, j, true);
1190 static int transaction_apply(Manager *m) {
1195 /* Moves the transaction jobs to the set of active jobs */
1197 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1199 assert(!j->transaction_prev);
1200 assert(!j->transaction_next);
1205 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1209 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1211 /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1215 if (j->unit->meta.job)
1216 job_free(j->unit->meta.job);
1218 j->unit->meta.job = j;
1219 j->installed = true;
1220 m->n_installed_jobs ++;
1222 /* We're fully installed. Now let's free data we don't
1225 assert(!j->transaction_next);
1226 assert(!j->transaction_prev);
1228 job_add_to_run_queue(j);
1229 job_add_to_dbus_queue(j);
1232 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1235 /* As last step, kill all remaining job dependencies. */
1236 transaction_clean_dependencies(m);
1242 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1246 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1252 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1254 unsigned generation = 1;
1258 /* This applies the changes recorded in transaction_jobs to
1259 * the actual list of jobs, if possible. */
1261 /* First step: figure out which jobs matter */
1262 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1264 /* Second step: Try not to stop any running services if
1265 * we don't have to. Don't try to reverse running
1266 * jobs if we don't have to. */
1267 if (mode == JOB_FAIL)
1268 transaction_minimize_impact(m);
1270 /* Third step: Drop redundant jobs */
1271 transaction_drop_redundant(m);
1274 /* Fourth step: Let's remove unneeded jobs that might
1276 transaction_collect_garbage(m);
1278 /* Fifth step: verify order makes sense and correct
1279 * cycles if necessary and possible */
1280 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1284 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1288 /* Let's see if the resulting transaction ordering
1289 * graph is still cyclic... */
1293 /* Sixth step: let's drop unmergeable entries if
1294 * necessary and possible, merge entries we can
1296 if ((r = transaction_merge_jobs(m, e)) >= 0)
1300 log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1304 /* Seventh step: an entry got dropped, let's garbage
1305 * collect its dependencies. */
1306 transaction_collect_garbage(m);
1308 /* Let's see if the resulting transaction still has
1309 * unmergeable entries ... */
1312 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1313 transaction_drop_redundant(m);
1315 /* Ninth step: check whether we can actually apply this */
1316 if (mode == JOB_FAIL)
1317 if ((r = transaction_is_destructive(m, e)) < 0) {
1318 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1322 /* Tenth step: apply changes */
1323 if ((r = transaction_apply(m)) < 0) {
1324 log_warning("Failed to apply transaction: %s", strerror(-r));
1328 assert(hashmap_isempty(m->transaction_jobs));
1329 assert(!m->transaction_anchor);
1334 transaction_abort(m);
1338 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1344 /* Looks for an existing prospective job and returns that. If
1345 * it doesn't exist it is created and added to the prospective
1348 f = hashmap_get(m->transaction_jobs, unit);
1350 LIST_FOREACH(transaction, j, f) {
1351 assert(j->unit == unit);
1353 if (j->type == type) {
1360 if (unit->meta.job && unit->meta.job->type == type)
1362 else if (!(j = job_new(m, type, unit)))
1367 j->matters_to_anchor = false;
1368 j->override = override;
1370 LIST_PREPEND(Job, transaction, f, j);
1372 if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1380 /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1385 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1389 if (j->transaction_prev)
1390 j->transaction_prev->transaction_next = j->transaction_next;
1391 else if (j->transaction_next)
1392 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1394 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1396 if (j->transaction_next)
1397 j->transaction_next->transaction_prev = j->transaction_prev;
1399 j->transaction_prev = j->transaction_next = NULL;
1401 while (j->subject_list)
1402 job_dependency_free(j->subject_list);
1404 while (j->object_list) {
1405 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1407 job_dependency_free(j->object_list);
1409 if (other && delete_dependencies) {
1410 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1411 other->unit->meta.id, job_type_to_string(other->type),
1412 j->unit->meta.id, job_type_to_string(j->type));
1413 transaction_delete_job(m, other, delete_dependencies);
1418 static int transaction_add_job_and_dependencies(
1426 bool ignore_requirements,
1437 assert(type < _JOB_TYPE_MAX);
1440 /* log_debug("Pulling in %s/%s from %s/%s", */
1441 /* unit->meta.id, job_type_to_string(type), */
1442 /* by ? by->unit->meta.id : "NA", */
1443 /* by ? job_type_to_string(by->type) : "NA"); */
1445 if (unit->meta.load_state != UNIT_LOADED &&
1446 unit->meta.load_state != UNIT_ERROR &&
1447 unit->meta.load_state != UNIT_MASKED) {
1448 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1452 if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1453 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1454 "Unit %s failed to load: %s. "
1455 "See system logs and 'systemctl status' for details.",
1457 strerror(-unit->meta.load_error));
1461 if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1462 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1466 if (!unit_job_is_applicable(unit, type)) {
1467 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);
1471 /* First add the job. */
1472 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1475 ret->ignore_order = ret->ignore_order || ignore_order;
1477 /* Then, add a link to the job. */
1478 if (!job_dependency_new(by, ret, matters, conflicts))
1481 if (is_new && !ignore_requirements) {
1484 /* If we are following some other unit, make sure we
1485 * add all dependencies of everybody following. */
1486 if (unit_following_set(ret->unit, &following) > 0) {
1487 SET_FOREACH(dep, following, i)
1488 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1489 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1495 set_free(following);
1498 /* Finally, recursively add in all dependencies. */
1499 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1500 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1501 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1509 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1510 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1519 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1520 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1521 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1527 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1528 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
1529 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1535 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1536 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1545 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1546 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1547 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1553 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1554 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
1563 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1564 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1565 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1571 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1573 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1574 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1583 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1584 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1594 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1606 static int transaction_add_isolate_jobs(Manager *m) {
1614 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1616 /* ignore aliases */
1617 if (u->meta.id != k)
1620 if (UNIT_VTABLE(u)->no_isolate)
1623 /* No need to stop inactive jobs */
1624 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1627 /* Is there already something listed for this? */
1628 if (hashmap_get(m->transaction_jobs, u))
1631 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
1632 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1638 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1643 assert(type < _JOB_TYPE_MAX);
1645 assert(mode < _JOB_MODE_MAX);
1647 if (mode == JOB_ISOLATE && type != JOB_START) {
1648 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1652 if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1653 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1657 log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1659 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1660 mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1661 mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1662 transaction_abort(m);
1666 if (mode == JOB_ISOLATE)
1667 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1668 transaction_abort(m);
1672 if ((r = transaction_activate(m, mode, e)) < 0)
1675 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1683 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1688 assert(type < _JOB_TYPE_MAX);
1690 assert(mode < _JOB_MODE_MAX);
1692 if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1695 return manager_add_job(m, type, unit, mode, override, e, _ret);
1698 Job *manager_get_job(Manager *m, uint32_t id) {
1701 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1704 Unit *manager_get_unit(Manager *m, const char *name) {
1708 return hashmap_get(m->units, name);
1711 unsigned manager_dispatch_load_queue(Manager *m) {
1717 /* Make sure we are not run recursively */
1718 if (m->dispatching_load_queue)
1721 m->dispatching_load_queue = true;
1723 /* Dispatches the load queue. Takes a unit from the queue and
1724 * tries to load its data until the queue is empty */
1726 while ((meta = m->load_queue)) {
1727 assert(meta->in_load_queue);
1729 unit_load((Unit*) meta);
1733 m->dispatching_load_queue = false;
1737 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1742 assert(name || path);
1744 /* This will prepare the unit for loading, but not actually
1745 * load anything from disk. */
1747 if (path && !is_path(path)) {
1748 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1753 name = file_name_from_path(path);
1755 if (!unit_name_is_valid(name, false)) {
1756 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1760 if ((ret = manager_get_unit(m, name))) {
1765 if (!(ret = unit_new(m)))
1769 if (!(ret->meta.fragment_path = strdup(path))) {
1774 if ((r = unit_add_name(ret, name)) < 0) {
1779 unit_add_to_load_queue(ret);
1780 unit_add_to_dbus_queue(ret);
1781 unit_add_to_gc_queue(ret);
1789 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1794 /* This will load the service information files, but not actually
1795 * start any services or anything. */
1797 if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1800 manager_dispatch_load_queue(m);
1803 *_ret = unit_follow_merge(*_ret);
1808 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1815 HASHMAP_FOREACH(j, s->jobs, i)
1816 job_dump(j, f, prefix);
1819 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1827 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1828 if (u->meta.id == t)
1829 unit_dump(u, f, prefix);
1832 void manager_clear_jobs(Manager *m) {
1837 transaction_abort(m);
1839 while ((j = hashmap_first(m->jobs)))
1840 job_finish_and_invalidate(j, JOB_CANCELED);
1843 unsigned manager_dispatch_run_queue(Manager *m) {
1847 if (m->dispatching_run_queue)
1850 m->dispatching_run_queue = true;
1852 while ((j = m->run_queue)) {
1853 assert(j->installed);
1854 assert(j->in_run_queue);
1856 job_run_and_invalidate(j);
1860 m->dispatching_run_queue = false;
1864 unsigned manager_dispatch_dbus_queue(Manager *m) {
1871 if (m->dispatching_dbus_queue)
1874 m->dispatching_dbus_queue = true;
1876 while ((meta = m->dbus_unit_queue)) {
1877 assert(meta->in_dbus_queue);
1879 bus_unit_send_change_signal((Unit*) meta);
1883 while ((j = m->dbus_job_queue)) {
1884 assert(j->in_dbus_queue);
1886 bus_job_send_change_signal(j);
1890 m->dispatching_dbus_queue = false;
1894 static int manager_process_notify_fd(Manager *m) {
1901 struct msghdr msghdr;
1903 struct ucred *ucred;
1905 struct cmsghdr cmsghdr;
1906 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1912 iovec.iov_base = buf;
1913 iovec.iov_len = sizeof(buf)-1;
1917 msghdr.msg_iov = &iovec;
1918 msghdr.msg_iovlen = 1;
1919 msghdr.msg_control = &control;
1920 msghdr.msg_controllen = sizeof(control);
1922 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1926 if (errno == EAGAIN || errno == EINTR)
1932 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1933 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1934 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1935 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1936 log_warning("Received notify message without credentials. Ignoring.");
1940 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1942 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1943 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1944 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1948 assert((size_t) n < sizeof(buf));
1950 if (!(tags = strv_split(buf, "\n\r")))
1953 log_debug("Got notification message for unit %s", u->meta.id);
1955 if (UNIT_VTABLE(u)->notify_message)
1956 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1964 static int manager_dispatch_sigchld(Manager *m) {
1974 /* First we call waitd() for a PID and do not reap the
1975 * zombie. That way we can still access /proc/$PID for
1976 * it while it is a zombie. */
1977 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1979 if (errno == ECHILD)
1991 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1994 get_process_name(si.si_pid, &name);
1995 log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1999 /* Let's flush any message the dying child might still
2000 * have queued for us. This ensures that the process
2001 * still exists in /proc so that we can figure out
2002 * which cgroup and hence unit it belongs to. */
2003 if ((r = manager_process_notify_fd(m)) < 0)
2006 /* And now figure out the unit this belongs to */
2007 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
2008 u = cgroup_unit_by_pid(m, si.si_pid);
2010 /* And now, we actually reap the zombie. */
2011 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2018 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2021 log_debug("Child %lu died (code=%s, status=%i/%s)",
2022 (long unsigned) si.si_pid,
2023 sigchld_code_to_string(si.si_code),
2025 strna(si.si_code == CLD_EXITED
2026 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2027 : signal_to_string(si.si_status)));
2032 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2034 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2035 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2041 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2045 dbus_error_init(&error);
2047 log_debug("Activating special unit %s", name);
2049 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2050 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2052 dbus_error_free(&error);
2057 static int manager_process_signal_fd(Manager *m) {
2059 struct signalfd_siginfo sfsi;
2060 bool sigchld = false;
2065 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2070 if (errno == EINTR || errno == EAGAIN)
2076 if (sfsi.ssi_pid > 0) {
2079 get_process_name(sfsi.ssi_pid, &p);
2081 log_debug("Received SIG%s from PID %lu (%s).",
2082 strna(signal_to_string(sfsi.ssi_signo)),
2083 (unsigned long) sfsi.ssi_pid, strna(p));
2086 log_debug("Received SIG%s.", strna(signal_to_string(sfsi.ssi_signo)));
2088 switch (sfsi.ssi_signo) {
2095 if (m->running_as == MANAGER_SYSTEM) {
2096 /* This is for compatibility with the
2097 * original sysvinit */
2098 m->exit_code = MANAGER_REEXECUTE;
2105 if (m->running_as == MANAGER_SYSTEM) {
2106 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2110 /* Run the exit target if there is one, if not, just exit. */
2111 if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2112 m->exit_code = MANAGER_EXIT;
2119 if (m->running_as == MANAGER_SYSTEM)
2120 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2122 /* This is a nop on non-init */
2126 if (m->running_as == MANAGER_SYSTEM)
2127 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2129 /* This is a nop on non-init */
2135 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2137 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2138 log_info("Trying to reconnect to bus...");
2142 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2143 log_info("Loading D-Bus service...");
2144 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2155 if (!(f = open_memstream(&dump, &size))) {
2156 log_warning("Failed to allocate memory stream.");
2160 manager_dump_units(m, f, "\t");
2161 manager_dump_jobs(m, f, "\t");
2166 log_warning("Failed to write status stream");
2171 log_dump(LOG_INFO, dump);
2178 m->exit_code = MANAGER_RELOAD;
2182 /* Starting SIGRTMIN+0 */
2183 static const char * const target_table[] = {
2184 [0] = SPECIAL_DEFAULT_TARGET,
2185 [1] = SPECIAL_RESCUE_TARGET,
2186 [2] = SPECIAL_EMERGENCY_TARGET,
2187 [3] = SPECIAL_HALT_TARGET,
2188 [4] = SPECIAL_POWEROFF_TARGET,
2189 [5] = SPECIAL_REBOOT_TARGET,
2190 [6] = SPECIAL_KEXEC_TARGET
2193 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2194 static const ManagerExitCode code_table[] = {
2196 [1] = MANAGER_POWEROFF,
2197 [2] = MANAGER_REBOOT,
2201 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2202 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2203 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2204 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2208 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2209 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2210 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2214 switch (sfsi.ssi_signo - SIGRTMIN) {
2217 log_debug("Enabling showing of status.");
2218 m->show_status = true;
2222 log_debug("Disabling showing of status.");
2223 m->show_status = false;
2227 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2234 return manager_dispatch_sigchld(m);
2239 static int process_event(Manager *m, struct epoll_event *ev) {
2246 assert(w = ev->data.ptr);
2248 if (w->type == WATCH_INVALID)
2255 /* An incoming signal? */
2256 if (ev->events != EPOLLIN)
2259 if ((r = manager_process_signal_fd(m)) < 0)
2266 /* An incoming daemon notification event? */
2267 if (ev->events != EPOLLIN)
2270 if ((r = manager_process_notify_fd(m)) < 0)
2277 /* Some fd event, to be dispatched to the units */
2278 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2281 case WATCH_UNIT_TIMER:
2282 case WATCH_JOB_TIMER: {
2286 /* Some timer event, to be dispatched to the units */
2287 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2289 if (k < 0 && (errno == EINTR || errno == EAGAIN))
2292 return k < 0 ? -errno : -EIO;
2295 if (w->type == WATCH_UNIT_TIMER)
2296 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2298 job_timer_event(w->data.job, v, w);
2303 /* Some mount table change, intended for the mount subsystem */
2304 mount_fd_event(m, ev->events);
2308 /* Some swap table change, intended for the swap subsystem */
2309 swap_fd_event(m, ev->events);
2313 /* Some notification from udev, intended for the device subsystem */
2314 device_fd_event(m, ev->events);
2317 case WATCH_DBUS_WATCH:
2318 bus_watch_event(m, w, ev->events);
2321 case WATCH_DBUS_TIMEOUT:
2322 bus_timeout_event(m, w, ev->events);
2326 log_error("event type=%i", w->type);
2327 assert_not_reached("Unknown epoll event type.");
2333 int manager_loop(Manager *m) {
2336 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2339 m->exit_code = MANAGER_RUNNING;
2341 /* Release the path cache */
2342 set_free_free(m->unit_path_cache);
2343 m->unit_path_cache = NULL;
2345 manager_check_finished(m);
2347 /* There might still be some zombies hanging around from
2348 * before we were exec()'ed. Leat's reap them */
2349 if ((r = manager_dispatch_sigchld(m)) < 0)
2352 while (m->exit_code == MANAGER_RUNNING) {
2353 struct epoll_event event;
2356 if (!ratelimit_test(&rl)) {
2357 /* Yay, something is going seriously wrong, pause a little */
2358 log_warning("Looping too fast. Throttling execution a little.");
2362 if (manager_dispatch_load_queue(m) > 0)
2365 if (manager_dispatch_run_queue(m) > 0)
2368 if (bus_dispatch(m) > 0)
2371 if (manager_dispatch_cleanup_queue(m) > 0)
2374 if (manager_dispatch_gc_queue(m) > 0)
2377 if (manager_dispatch_dbus_queue(m) > 0)
2380 if (swap_dispatch_reload(m) > 0)
2383 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2393 if ((r = process_event(m, &event)) < 0)
2397 return m->exit_code;
2400 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2408 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2411 if (!(n = bus_path_unescape(s+31)))
2414 u = manager_get_unit(m, n);
2425 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2434 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2437 if ((r = safe_atou(s + 30, &id)) < 0)
2440 if (!(j = manager_get_job(m, id)))
2448 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2453 if (m->audit_fd < 0)
2456 /* Don't generate audit events if the service was already
2457 * started and we're just deserializing */
2458 if (m->n_deserializing > 0)
2461 if (m->running_as != MANAGER_SYSTEM)
2464 if (u->meta.type != UNIT_SERVICE)
2467 if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2468 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2472 if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2473 log_warning("Failed to send audit message: %m");
2475 if (errno == EPERM) {
2476 /* We aren't allowed to send audit messages?
2477 * Then let's not retry again, to avoid
2478 * spamming the user with the same and same
2479 * messages over and over. */
2481 audit_close(m->audit_fd);
2491 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2493 union sockaddr_union sa;
2495 char *message = NULL;
2497 /* Don't generate plymouth events if the service was already
2498 * started and we're just deserializing */
2499 if (m->n_deserializing > 0)
2502 if (m->running_as != MANAGER_SYSTEM)
2505 if (u->meta.type != UNIT_SERVICE &&
2506 u->meta.type != UNIT_MOUNT &&
2507 u->meta.type != UNIT_SWAP)
2510 /* We set SOCK_NONBLOCK here so that we rather drop the
2511 * message then wait for plymouth */
2512 if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2513 log_error("socket() failed: %m");
2518 sa.sa.sa_family = AF_UNIX;
2519 strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2520 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2522 if (errno != EPIPE &&
2525 errno != ECONNREFUSED &&
2526 errno != ECONNRESET &&
2527 errno != ECONNABORTED)
2528 log_error("connect() failed: %m");
2533 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2534 log_error("Out of memory");
2539 if (write(fd, message, n + 1) != n + 1) {
2541 if (errno != EPIPE &&
2544 errno != ECONNREFUSED &&
2545 errno != ECONNRESET &&
2546 errno != ECONNABORTED)
2547 log_error("Failed to write Plymouth message: %m");
2554 close_nointr_nofail(fd);
2559 void manager_dispatch_bus_name_owner_changed(
2562 const char* old_owner,
2563 const char *new_owner) {
2570 if (!(u = hashmap_get(m->watch_bus, name)))
2573 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2576 void manager_dispatch_bus_query_pid_done(
2587 if (!(u = hashmap_get(m->watch_bus, name)))
2590 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2593 int manager_open_serialization(Manager *m, FILE **_f) {
2601 if (m->running_as == MANAGER_SYSTEM)
2602 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2604 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2609 saved_umask = umask(0077);
2610 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2620 log_debug("Serializing state to %s", path);
2623 if (!(f = fdopen(fd, "w+")))
2631 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2641 dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2642 dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2643 dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2647 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2648 if (u->meta.id != t)
2651 if (!unit_can_serialize(u))
2655 fputs(u->meta.id, f);
2658 if ((r = unit_serialize(u, f, fds)) < 0)
2668 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2674 log_debug("Deserializing state...");
2676 m->n_deserializing ++;
2679 char line[1024], *l;
2681 if (!fgets(line, sizeof(line), f)) {
2696 if (startswith(l, "initrd-timestamp="))
2697 dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2698 else if (startswith(l, "startup-timestamp="))
2699 dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2700 else if (startswith(l, "finish-timestamp="))
2701 dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2703 log_debug("Unknown serialization item '%s'", l);
2708 char name[UNIT_NAME_MAX+2];
2711 if (!fgets(name, sizeof(name), f)) {
2722 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2725 if ((r = unit_deserialize(u, f, fds)) < 0)
2735 assert(m->n_deserializing > 0);
2736 m->n_deserializing --;
2741 int manager_reload(Manager *m) {
2748 if ((r = manager_open_serialization(m, &f)) < 0)
2751 if (!(fds = fdset_new())) {
2756 if ((r = manager_serialize(m, f, fds)) < 0)
2759 if (fseeko(f, 0, SEEK_SET) < 0) {
2764 /* From here on there is no way back. */
2765 manager_clear_jobs_and_units(m);
2766 manager_undo_generators(m);
2768 /* Find new unit paths */
2769 lookup_paths_free(&m->lookup_paths);
2770 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2773 manager_run_generators(m);
2775 manager_build_unit_path_cache(m);
2777 m->n_deserializing ++;
2779 /* First, enumerate what we can from all config files */
2780 if ((q = manager_enumerate(m)) < 0)
2783 /* Second, deserialize our stored data */
2784 if ((q = manager_deserialize(m, f, fds)) < 0)
2790 /* Third, fire things up! */
2791 if ((q = manager_coldplug(m)) < 0)
2794 assert(m->n_deserializing > 0);
2795 m->n_deserializing ++;
2807 bool manager_is_booting_or_shutting_down(Manager *m) {
2812 /* Is the initial job still around? */
2813 if (manager_get_job(m, 1))
2816 /* Is there a job for the shutdown target? */
2817 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2818 return !!u->meta.job;
2823 void manager_reset_failed(Manager *m) {
2829 HASHMAP_FOREACH(u, m->units, i)
2830 unit_reset_failed(u);
2833 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2839 /* Returns true if the unit is inactive or going down */
2840 if (!(u = manager_get_unit(m, name)))
2843 return unit_pending_inactive(u);
2846 void manager_check_finished(Manager *m) {
2847 char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2851 if (dual_timestamp_is_set(&m->finish_timestamp))
2854 if (hashmap_size(m->jobs) > 0)
2857 dual_timestamp_get(&m->finish_timestamp);
2859 if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2861 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2862 log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2863 format_timespan(kernel, sizeof(kernel),
2864 m->initrd_timestamp.monotonic),
2865 format_timespan(initrd, sizeof(initrd),
2866 m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2867 format_timespan(userspace, sizeof(userspace),
2868 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2869 format_timespan(sum, sizeof(sum),
2870 m->finish_timestamp.monotonic));
2872 log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2873 format_timespan(kernel, sizeof(kernel),
2874 m->startup_timestamp.monotonic),
2875 format_timespan(userspace, sizeof(userspace),
2876 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2877 format_timespan(sum, sizeof(sum),
2878 m->finish_timestamp.monotonic));
2880 log_debug("Startup finished in %s.",
2881 format_timespan(userspace, sizeof(userspace),
2882 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2886 void manager_run_generators(Manager *m) {
2888 const char *generator_path;
2889 const char *argv[3];
2893 generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2894 if (!(d = opendir(generator_path))) {
2896 if (errno == ENOENT)
2899 log_error("Failed to enumerate generator directory: %m");
2903 if (!m->generator_unit_path) {
2905 char system_path[] = "/run/systemd/generator-XXXXXX",
2906 user_path[] = "/tmp/systemd-generator-XXXXXX";
2908 if (!(p = mkdtemp(m->running_as == MANAGER_SYSTEM ? system_path : user_path))) {
2909 log_error("Failed to generate generator directory: %m");
2913 if (!(m->generator_unit_path = strdup(p))) {
2914 log_error("Failed to allocate generator unit path.");
2919 argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2920 argv[1] = m->generator_unit_path;
2923 execute_directory(generator_path, d, (char**) argv);
2925 if (rmdir(m->generator_unit_path) >= 0) {
2926 /* Uh? we were able to remove this dir? I guess that
2927 * means the directory was empty, hence let's shortcut
2930 free(m->generator_unit_path);
2931 m->generator_unit_path = NULL;
2935 if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
2938 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
2939 log_error("Failed to add generator directory to unit search path: %m");
2943 strv_free(m->lookup_paths.unit_path);
2944 m->lookup_paths.unit_path = l;
2946 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
2954 void manager_undo_generators(Manager *m) {
2957 if (!m->generator_unit_path)
2960 strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
2961 rm_rf(m->generator_unit_path, false, true);
2963 free(m->generator_unit_path);
2964 m->generator_unit_path = NULL;
2967 int manager_set_default_controllers(Manager *m, char **controllers) {
2972 if (!(l = strv_copy(controllers)))
2975 strv_free(m->default_controllers);
2976 m->default_controllers = l;
2981 void manager_recheck_syslog(Manager *m) {
2986 if (m->running_as != MANAGER_SYSTEM)
2989 if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
2992 state = SOCKET(u)->state;
2994 if (state != SOCKET_DEAD &&
2995 state != SOCKET_FAILED &&
2996 state != SOCKET_RUNNING) {
2998 /* Hmm, the socket is not set up, or is still
2999 * listening, let's better not try to use
3000 * it. Note that we have no problem if the
3001 * socket is completely down, since there
3002 * might be a foreign /dev/log socket around
3003 * and we want to make use of that.
3011 if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3012 if (TARGET(u)->state != TARGET_ACTIVE) {
3017 /* Hmm, OK, so the socket is either fully up, or fully down,
3018 * and the target is up, then let's make use of the socket */
3022 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3023 [MANAGER_SYSTEM] = "system",
3024 [MANAGER_USER] = "user"
3027 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);