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_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1172 if (changes_existing_job)
1173 log_debug("%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_debug("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, JobMode mode) {
1195 /* Moves the transaction jobs to the set of active jobs */
1197 if (mode == JOB_ISOLATE) {
1199 /* When isolating first kill all installed jobs which
1200 * aren't part of the new transaction */
1201 HASHMAP_FOREACH(j, m->jobs, i) {
1202 assert(j->installed);
1204 if (hashmap_get(m->transaction_jobs, j->unit))
1207 job_finish_and_invalidate(j, JOB_CANCELED);
1211 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1213 assert(!j->transaction_prev);
1214 assert(!j->transaction_next);
1219 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1223 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1225 /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1229 if (j->unit->meta.job)
1230 job_free(j->unit->meta.job);
1232 j->unit->meta.job = j;
1233 j->installed = true;
1234 m->n_installed_jobs ++;
1236 /* We're fully installed. Now let's free data we don't
1239 assert(!j->transaction_next);
1240 assert(!j->transaction_prev);
1242 job_add_to_run_queue(j);
1243 job_add_to_dbus_queue(j);
1246 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1249 /* As last step, kill all remaining job dependencies. */
1250 transaction_clean_dependencies(m);
1256 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1260 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1266 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1268 unsigned generation = 1;
1272 /* This applies the changes recorded in transaction_jobs to
1273 * the actual list of jobs, if possible. */
1275 /* First step: figure out which jobs matter */
1276 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1278 /* Second step: Try not to stop any running services if
1279 * we don't have to. Don't try to reverse running
1280 * jobs if we don't have to. */
1281 if (mode == JOB_FAIL)
1282 transaction_minimize_impact(m);
1284 /* Third step: Drop redundant jobs */
1285 transaction_drop_redundant(m);
1288 /* Fourth step: Let's remove unneeded jobs that might
1290 if (mode != JOB_ISOLATE)
1291 transaction_collect_garbage(m);
1293 /* Fifth step: verify order makes sense and correct
1294 * cycles if necessary and possible */
1295 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1299 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1303 /* Let's see if the resulting transaction ordering
1304 * graph is still cyclic... */
1308 /* Sixth step: let's drop unmergeable entries if
1309 * necessary and possible, merge entries we can
1311 if ((r = transaction_merge_jobs(m, e)) >= 0)
1315 log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1319 /* Seventh step: an entry got dropped, let's garbage
1320 * collect its dependencies. */
1321 if (mode != JOB_ISOLATE)
1322 transaction_collect_garbage(m);
1324 /* Let's see if the resulting transaction still has
1325 * unmergeable entries ... */
1328 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1329 transaction_drop_redundant(m);
1331 /* Ninth step: check whether we can actually apply this */
1332 if (mode == JOB_FAIL)
1333 if ((r = transaction_is_destructive(m, e)) < 0) {
1334 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1338 /* Tenth step: apply changes */
1339 if ((r = transaction_apply(m, mode)) < 0) {
1340 log_warning("Failed to apply transaction: %s", strerror(-r));
1344 assert(hashmap_isempty(m->transaction_jobs));
1345 assert(!m->transaction_anchor);
1350 transaction_abort(m);
1354 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1360 /* Looks for an existing prospective job and returns that. If
1361 * it doesn't exist it is created and added to the prospective
1364 f = hashmap_get(m->transaction_jobs, unit);
1366 LIST_FOREACH(transaction, j, f) {
1367 assert(j->unit == unit);
1369 if (j->type == type) {
1376 if (unit->meta.job && unit->meta.job->type == type)
1378 else if (!(j = job_new(m, type, unit)))
1383 j->matters_to_anchor = false;
1384 j->override = override;
1386 LIST_PREPEND(Job, transaction, f, j);
1388 if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1396 /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1401 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1405 if (j->transaction_prev)
1406 j->transaction_prev->transaction_next = j->transaction_next;
1407 else if (j->transaction_next)
1408 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1410 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1412 if (j->transaction_next)
1413 j->transaction_next->transaction_prev = j->transaction_prev;
1415 j->transaction_prev = j->transaction_next = NULL;
1417 while (j->subject_list)
1418 job_dependency_free(j->subject_list);
1420 while (j->object_list) {
1421 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1423 job_dependency_free(j->object_list);
1425 if (other && delete_dependencies) {
1426 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1427 other->unit->meta.id, job_type_to_string(other->type),
1428 j->unit->meta.id, job_type_to_string(j->type));
1429 transaction_delete_job(m, other, delete_dependencies);
1434 static int transaction_add_job_and_dependencies(
1442 bool ignore_requirements,
1453 assert(type < _JOB_TYPE_MAX);
1456 /* log_debug("Pulling in %s/%s from %s/%s", */
1457 /* unit->meta.id, job_type_to_string(type), */
1458 /* by ? by->unit->meta.id : "NA", */
1459 /* by ? job_type_to_string(by->type) : "NA"); */
1461 if (unit->meta.load_state != UNIT_LOADED &&
1462 unit->meta.load_state != UNIT_ERROR &&
1463 unit->meta.load_state != UNIT_MASKED) {
1464 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1468 if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1469 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1470 "Unit %s failed to load: %s. "
1471 "See system logs and 'systemctl status %s' for details.",
1473 strerror(-unit->meta.load_error),
1478 if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1479 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1483 if (!unit_job_is_applicable(unit, type)) {
1484 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);
1488 /* First add the job. */
1489 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1492 ret->ignore_order = ret->ignore_order || ignore_order;
1494 /* Then, add a link to the job. */
1495 if (!job_dependency_new(by, ret, matters, conflicts))
1498 if (is_new && !ignore_requirements) {
1501 /* If we are following some other unit, make sure we
1502 * add all dependencies of everybody following. */
1503 if (unit_following_set(ret->unit, &following) > 0) {
1504 SET_FOREACH(dep, following, i)
1505 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1506 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1512 set_free(following);
1515 /* Finally, recursively add in all dependencies. */
1516 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1517 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1518 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1526 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1527 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1536 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1537 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1538 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1544 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1545 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
1546 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1552 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1553 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1562 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1563 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1564 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1570 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1571 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
1580 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1581 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1582 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1588 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1590 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1591 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1600 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1601 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1611 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1623 static int transaction_add_isolate_jobs(Manager *m) {
1631 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1633 /* ignore aliases */
1634 if (u->meta.id != k)
1637 if (u->meta.ignore_on_isolate)
1640 /* No need to stop inactive jobs */
1641 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1644 /* Is there already something listed for this? */
1645 if (hashmap_get(m->transaction_jobs, u))
1648 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
1649 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1655 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1660 assert(type < _JOB_TYPE_MAX);
1662 assert(mode < _JOB_MODE_MAX);
1664 if (mode == JOB_ISOLATE && type != JOB_START) {
1665 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1669 if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1670 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1674 log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1676 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1677 mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1678 mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1679 transaction_abort(m);
1683 if (mode == JOB_ISOLATE)
1684 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1685 transaction_abort(m);
1689 if ((r = transaction_activate(m, mode, e)) < 0)
1692 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1700 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1705 assert(type < _JOB_TYPE_MAX);
1707 assert(mode < _JOB_MODE_MAX);
1709 if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1712 return manager_add_job(m, type, unit, mode, override, e, _ret);
1715 Job *manager_get_job(Manager *m, uint32_t id) {
1718 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1721 Unit *manager_get_unit(Manager *m, const char *name) {
1725 return hashmap_get(m->units, name);
1728 unsigned manager_dispatch_load_queue(Manager *m) {
1734 /* Make sure we are not run recursively */
1735 if (m->dispatching_load_queue)
1738 m->dispatching_load_queue = true;
1740 /* Dispatches the load queue. Takes a unit from the queue and
1741 * tries to load its data until the queue is empty */
1743 while ((meta = m->load_queue)) {
1744 assert(meta->in_load_queue);
1746 unit_load((Unit*) meta);
1750 m->dispatching_load_queue = false;
1754 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1759 assert(name || path);
1761 /* This will prepare the unit for loading, but not actually
1762 * load anything from disk. */
1764 if (path && !is_path(path)) {
1765 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1770 name = file_name_from_path(path);
1772 if (!unit_name_is_valid(name, false)) {
1773 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1777 if ((ret = manager_get_unit(m, name))) {
1782 if (!(ret = unit_new(m)))
1786 if (!(ret->meta.fragment_path = strdup(path))) {
1791 if ((r = unit_add_name(ret, name)) < 0) {
1796 unit_add_to_load_queue(ret);
1797 unit_add_to_dbus_queue(ret);
1798 unit_add_to_gc_queue(ret);
1806 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1811 /* This will load the service information files, but not actually
1812 * start any services or anything. */
1814 if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1817 manager_dispatch_load_queue(m);
1820 *_ret = unit_follow_merge(*_ret);
1825 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1832 HASHMAP_FOREACH(j, s->jobs, i)
1833 job_dump(j, f, prefix);
1836 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1844 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1845 if (u->meta.id == t)
1846 unit_dump(u, f, prefix);
1849 void manager_clear_jobs(Manager *m) {
1854 transaction_abort(m);
1856 while ((j = hashmap_first(m->jobs)))
1857 job_finish_and_invalidate(j, JOB_CANCELED);
1860 unsigned manager_dispatch_run_queue(Manager *m) {
1864 if (m->dispatching_run_queue)
1867 m->dispatching_run_queue = true;
1869 while ((j = m->run_queue)) {
1870 assert(j->installed);
1871 assert(j->in_run_queue);
1873 job_run_and_invalidate(j);
1877 m->dispatching_run_queue = false;
1881 unsigned manager_dispatch_dbus_queue(Manager *m) {
1888 if (m->dispatching_dbus_queue)
1891 m->dispatching_dbus_queue = true;
1893 while ((meta = m->dbus_unit_queue)) {
1894 assert(meta->in_dbus_queue);
1896 bus_unit_send_change_signal((Unit*) meta);
1900 while ((j = m->dbus_job_queue)) {
1901 assert(j->in_dbus_queue);
1903 bus_job_send_change_signal(j);
1907 m->dispatching_dbus_queue = false;
1911 static int manager_process_notify_fd(Manager *m) {
1918 struct msghdr msghdr;
1920 struct ucred *ucred;
1922 struct cmsghdr cmsghdr;
1923 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1929 iovec.iov_base = buf;
1930 iovec.iov_len = sizeof(buf)-1;
1934 msghdr.msg_iov = &iovec;
1935 msghdr.msg_iovlen = 1;
1936 msghdr.msg_control = &control;
1937 msghdr.msg_controllen = sizeof(control);
1939 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1943 if (errno == EAGAIN || errno == EINTR)
1949 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1950 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1951 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1952 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1953 log_warning("Received notify message without credentials. Ignoring.");
1957 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1959 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1960 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1961 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1965 assert((size_t) n < sizeof(buf));
1967 if (!(tags = strv_split(buf, "\n\r")))
1970 log_debug("Got notification message for unit %s", u->meta.id);
1972 if (UNIT_VTABLE(u)->notify_message)
1973 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1981 static int manager_dispatch_sigchld(Manager *m) {
1991 /* First we call waitd() for a PID and do not reap the
1992 * zombie. That way we can still access /proc/$PID for
1993 * it while it is a zombie. */
1994 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1996 if (errno == ECHILD)
2008 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
2011 get_process_name(si.si_pid, &name);
2012 log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
2016 /* Let's flush any message the dying child might still
2017 * have queued for us. This ensures that the process
2018 * still exists in /proc so that we can figure out
2019 * which cgroup and hence unit it belongs to. */
2020 if ((r = manager_process_notify_fd(m)) < 0)
2023 /* And now figure out the unit this belongs to */
2024 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
2025 u = cgroup_unit_by_pid(m, si.si_pid);
2027 /* And now, we actually reap the zombie. */
2028 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2035 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2038 log_debug("Child %lu died (code=%s, status=%i/%s)",
2039 (long unsigned) si.si_pid,
2040 sigchld_code_to_string(si.si_code),
2042 strna(si.si_code == CLD_EXITED
2043 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2044 : signal_to_string(si.si_status)));
2049 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2051 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2052 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2058 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2062 dbus_error_init(&error);
2064 log_debug("Activating special unit %s", name);
2066 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2067 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2069 dbus_error_free(&error);
2074 static int manager_process_signal_fd(Manager *m) {
2076 struct signalfd_siginfo sfsi;
2077 bool sigchld = false;
2082 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2087 if (errno == EINTR || errno == EAGAIN)
2093 if (sfsi.ssi_pid > 0) {
2096 get_process_name(sfsi.ssi_pid, &p);
2098 log_debug("Received SIG%s from PID %lu (%s).",
2099 strna(signal_to_string(sfsi.ssi_signo)),
2100 (unsigned long) sfsi.ssi_pid, strna(p));
2103 log_debug("Received SIG%s.", strna(signal_to_string(sfsi.ssi_signo)));
2105 switch (sfsi.ssi_signo) {
2112 if (m->running_as == MANAGER_SYSTEM) {
2113 /* This is for compatibility with the
2114 * original sysvinit */
2115 m->exit_code = MANAGER_REEXECUTE;
2122 if (m->running_as == MANAGER_SYSTEM) {
2123 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2127 /* Run the exit target if there is one, if not, just exit. */
2128 if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2129 m->exit_code = MANAGER_EXIT;
2136 if (m->running_as == MANAGER_SYSTEM)
2137 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2139 /* This is a nop on non-init */
2143 if (m->running_as == MANAGER_SYSTEM)
2144 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2146 /* This is a nop on non-init */
2152 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2154 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2155 log_info("Trying to reconnect to bus...");
2159 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2160 log_info("Loading D-Bus service...");
2161 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2172 if (!(f = open_memstream(&dump, &size))) {
2173 log_warning("Failed to allocate memory stream.");
2177 manager_dump_units(m, f, "\t");
2178 manager_dump_jobs(m, f, "\t");
2183 log_warning("Failed to write status stream");
2188 log_dump(LOG_INFO, dump);
2195 m->exit_code = MANAGER_RELOAD;
2199 /* Starting SIGRTMIN+0 */
2200 static const char * const target_table[] = {
2201 [0] = SPECIAL_DEFAULT_TARGET,
2202 [1] = SPECIAL_RESCUE_TARGET,
2203 [2] = SPECIAL_EMERGENCY_TARGET,
2204 [3] = SPECIAL_HALT_TARGET,
2205 [4] = SPECIAL_POWEROFF_TARGET,
2206 [5] = SPECIAL_REBOOT_TARGET,
2207 [6] = SPECIAL_KEXEC_TARGET
2210 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2211 static const ManagerExitCode code_table[] = {
2213 [1] = MANAGER_POWEROFF,
2214 [2] = MANAGER_REBOOT,
2218 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2219 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2220 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2221 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2225 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2226 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2227 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2231 switch (sfsi.ssi_signo - SIGRTMIN) {
2234 log_debug("Enabling showing of status.");
2235 m->show_status = true;
2239 log_debug("Disabling showing of status.");
2240 m->show_status = false;
2244 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2251 return manager_dispatch_sigchld(m);
2256 static int process_event(Manager *m, struct epoll_event *ev) {
2263 assert_se(w = ev->data.ptr);
2265 if (w->type == WATCH_INVALID)
2272 /* An incoming signal? */
2273 if (ev->events != EPOLLIN)
2276 if ((r = manager_process_signal_fd(m)) < 0)
2283 /* An incoming daemon notification event? */
2284 if (ev->events != EPOLLIN)
2287 if ((r = manager_process_notify_fd(m)) < 0)
2294 /* Some fd event, to be dispatched to the units */
2295 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2298 case WATCH_UNIT_TIMER:
2299 case WATCH_JOB_TIMER: {
2303 /* Some timer event, to be dispatched to the units */
2304 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2306 if (k < 0 && (errno == EINTR || errno == EAGAIN))
2309 return k < 0 ? -errno : -EIO;
2312 if (w->type == WATCH_UNIT_TIMER)
2313 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2315 job_timer_event(w->data.job, v, w);
2320 /* Some mount table change, intended for the mount subsystem */
2321 mount_fd_event(m, ev->events);
2325 /* Some swap table change, intended for the swap subsystem */
2326 swap_fd_event(m, ev->events);
2330 /* Some notification from udev, intended for the device subsystem */
2331 device_fd_event(m, ev->events);
2334 case WATCH_DBUS_WATCH:
2335 bus_watch_event(m, w, ev->events);
2338 case WATCH_DBUS_TIMEOUT:
2339 bus_timeout_event(m, w, ev->events);
2343 log_error("event type=%i", w->type);
2344 assert_not_reached("Unknown epoll event type.");
2350 int manager_loop(Manager *m) {
2353 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2356 m->exit_code = MANAGER_RUNNING;
2358 /* Release the path cache */
2359 set_free_free(m->unit_path_cache);
2360 m->unit_path_cache = NULL;
2362 manager_check_finished(m);
2364 /* There might still be some zombies hanging around from
2365 * before we were exec()'ed. Leat's reap them */
2366 if ((r = manager_dispatch_sigchld(m)) < 0)
2369 while (m->exit_code == MANAGER_RUNNING) {
2370 struct epoll_event event;
2373 if (!ratelimit_test(&rl)) {
2374 /* Yay, something is going seriously wrong, pause a little */
2375 log_warning("Looping too fast. Throttling execution a little.");
2379 if (manager_dispatch_load_queue(m) > 0)
2382 if (manager_dispatch_run_queue(m) > 0)
2385 if (bus_dispatch(m) > 0)
2388 if (manager_dispatch_cleanup_queue(m) > 0)
2391 if (manager_dispatch_gc_queue(m) > 0)
2394 if (manager_dispatch_dbus_queue(m) > 0)
2397 if (swap_dispatch_reload(m) > 0)
2400 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2410 if ((r = process_event(m, &event)) < 0)
2414 return m->exit_code;
2417 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2425 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2428 if (!(n = bus_path_unescape(s+31)))
2431 u = manager_get_unit(m, n);
2442 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2451 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2454 if ((r = safe_atou(s + 30, &id)) < 0)
2457 if (!(j = manager_get_job(m, id)))
2465 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2470 if (m->audit_fd < 0)
2473 /* Don't generate audit events if the service was already
2474 * started and we're just deserializing */
2475 if (m->n_deserializing > 0)
2478 if (m->running_as != MANAGER_SYSTEM)
2481 if (u->meta.type != UNIT_SERVICE)
2484 if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2485 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2489 if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2490 log_warning("Failed to send audit message: %m");
2492 if (errno == EPERM) {
2493 /* We aren't allowed to send audit messages?
2494 * Then let's not retry again, to avoid
2495 * spamming the user with the same and same
2496 * messages over and over. */
2498 audit_close(m->audit_fd);
2508 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2510 union sockaddr_union sa;
2512 char *message = NULL;
2514 /* Don't generate plymouth events if the service was already
2515 * started and we're just deserializing */
2516 if (m->n_deserializing > 0)
2519 if (m->running_as != MANAGER_SYSTEM)
2522 if (u->meta.type != UNIT_SERVICE &&
2523 u->meta.type != UNIT_MOUNT &&
2524 u->meta.type != UNIT_SWAP)
2527 /* We set SOCK_NONBLOCK here so that we rather drop the
2528 * message then wait for plymouth */
2529 if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2530 log_error("socket() failed: %m");
2535 sa.sa.sa_family = AF_UNIX;
2536 strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2537 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2539 if (errno != EPIPE &&
2542 errno != ECONNREFUSED &&
2543 errno != ECONNRESET &&
2544 errno != ECONNABORTED)
2545 log_error("connect() failed: %m");
2550 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2551 log_error("Out of memory");
2556 if (write(fd, message, n + 1) != n + 1) {
2558 if (errno != EPIPE &&
2561 errno != ECONNREFUSED &&
2562 errno != ECONNRESET &&
2563 errno != ECONNABORTED)
2564 log_error("Failed to write Plymouth message: %m");
2571 close_nointr_nofail(fd);
2576 void manager_dispatch_bus_name_owner_changed(
2579 const char* old_owner,
2580 const char *new_owner) {
2587 if (!(u = hashmap_get(m->watch_bus, name)))
2590 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2593 void manager_dispatch_bus_query_pid_done(
2604 if (!(u = hashmap_get(m->watch_bus, name)))
2607 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2610 int manager_open_serialization(Manager *m, FILE **_f) {
2618 if (m->running_as == MANAGER_SYSTEM)
2619 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2621 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2626 saved_umask = umask(0077);
2627 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2637 log_debug("Serializing state to %s", path);
2640 if (!(f = fdopen(fd, "w+")))
2648 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2658 m->n_serializing ++;
2660 fprintf(f, "current-job-id=%i\n", m->current_job_id);
2661 fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2663 dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2664 dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2665 dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2669 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2670 if (u->meta.id != t)
2673 if (!unit_can_serialize(u))
2677 fputs(u->meta.id, f);
2680 if ((r = unit_serialize(u, f, fds)) < 0) {
2681 m->n_serializing --;
2686 assert(m->n_serializing > 0);
2687 m->n_serializing --;
2692 r = bus_fdset_add_all(m, fds);
2699 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2705 log_debug("Deserializing state...");
2707 m->n_deserializing ++;
2710 char line[LINE_MAX], *l;
2712 if (!fgets(line, sizeof(line), f)) {
2727 if (startswith(l, "current-job-id=")) {
2730 if (safe_atou32(l+15, &id) < 0)
2731 log_debug("Failed to parse current job id value %s", l+15);
2733 m->current_job_id = MAX(m->current_job_id, id);
2734 } else if (startswith(l, "taint-usr=")) {
2737 if ((b = parse_boolean(l+10)) < 0)
2738 log_debug("Failed to parse taint /usr flag %s", l+10);
2740 m->taint_usr = m->taint_usr || b;
2741 } else if (startswith(l, "initrd-timestamp="))
2742 dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2743 else if (startswith(l, "startup-timestamp="))
2744 dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2745 else if (startswith(l, "finish-timestamp="))
2746 dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2748 log_debug("Unknown serialization item '%s'", l);
2753 char name[UNIT_NAME_MAX+2];
2756 if (!fgets(name, sizeof(name), f)) {
2767 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2770 if ((r = unit_deserialize(u, f, fds)) < 0)
2780 assert(m->n_deserializing > 0);
2781 m->n_deserializing --;
2786 int manager_reload(Manager *m) {
2793 if ((r = manager_open_serialization(m, &f)) < 0)
2796 m->n_serializing ++;
2798 if (!(fds = fdset_new())) {
2799 m->n_serializing --;
2804 if ((r = manager_serialize(m, f, fds)) < 0) {
2805 m->n_serializing --;
2809 if (fseeko(f, 0, SEEK_SET) < 0) {
2810 m->n_serializing --;
2815 /* From here on there is no way back. */
2816 manager_clear_jobs_and_units(m);
2817 manager_undo_generators(m);
2819 assert(m->n_serializing > 0);
2820 m->n_serializing --;
2822 /* Find new unit paths */
2823 lookup_paths_free(&m->lookup_paths);
2824 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2827 manager_run_generators(m);
2829 manager_build_unit_path_cache(m);
2831 m->n_deserializing ++;
2833 /* First, enumerate what we can from all config files */
2834 if ((q = manager_enumerate(m)) < 0)
2837 /* Second, deserialize our stored data */
2838 if ((q = manager_deserialize(m, f, fds)) < 0)
2844 /* Third, fire things up! */
2845 if ((q = manager_coldplug(m)) < 0)
2848 assert(m->n_deserializing > 0);
2849 m->n_deserializing--;
2861 bool manager_is_booting_or_shutting_down(Manager *m) {
2866 /* Is the initial job still around? */
2867 if (manager_get_job(m, 1))
2870 /* Is there a job for the shutdown target? */
2871 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2872 return !!u->meta.job;
2877 void manager_reset_failed(Manager *m) {
2883 HASHMAP_FOREACH(u, m->units, i)
2884 unit_reset_failed(u);
2887 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2893 /* Returns true if the unit is inactive or going down */
2894 if (!(u = manager_get_unit(m, name)))
2897 return unit_pending_inactive(u);
2900 void manager_check_finished(Manager *m) {
2901 char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2905 if (dual_timestamp_is_set(&m->finish_timestamp))
2908 if (hashmap_size(m->jobs) > 0)
2911 dual_timestamp_get(&m->finish_timestamp);
2913 if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2915 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2916 log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2917 format_timespan(kernel, sizeof(kernel),
2918 m->initrd_timestamp.monotonic),
2919 format_timespan(initrd, sizeof(initrd),
2920 m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2921 format_timespan(userspace, sizeof(userspace),
2922 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2923 format_timespan(sum, sizeof(sum),
2924 m->finish_timestamp.monotonic));
2926 log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2927 format_timespan(kernel, sizeof(kernel),
2928 m->startup_timestamp.monotonic),
2929 format_timespan(userspace, sizeof(userspace),
2930 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2931 format_timespan(sum, sizeof(sum),
2932 m->finish_timestamp.monotonic));
2934 log_debug("Startup finished in %s.",
2935 format_timespan(userspace, sizeof(userspace),
2936 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2940 void manager_run_generators(Manager *m) {
2942 const char *generator_path;
2943 const char *argv[3];
2947 generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2948 if (!(d = opendir(generator_path))) {
2950 if (errno == ENOENT)
2953 log_error("Failed to enumerate generator directory: %m");
2957 if (!m->generator_unit_path) {
2959 char user_path[] = "/tmp/systemd-generator-XXXXXX";
2961 if (m->running_as == MANAGER_SYSTEM && getpid() == 1) {
2962 p = "/run/systemd/generator";
2964 if (mkdir_p(p, 0755) < 0) {
2965 log_error("Failed to create generator directory: %m");
2970 if (!(p = mkdtemp(user_path))) {
2971 log_error("Failed to create generator directory: %m");
2976 if (!(m->generator_unit_path = strdup(p))) {
2977 log_error("Failed to allocate generator unit path.");
2982 argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2983 argv[1] = m->generator_unit_path;
2986 execute_directory(generator_path, d, (char**) argv);
2988 if (rmdir(m->generator_unit_path) >= 0) {
2989 /* Uh? we were able to remove this dir? I guess that
2990 * means the directory was empty, hence let's shortcut
2993 free(m->generator_unit_path);
2994 m->generator_unit_path = NULL;
2998 if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
3001 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
3002 log_error("Failed to add generator directory to unit search path: %m");
3006 strv_free(m->lookup_paths.unit_path);
3007 m->lookup_paths.unit_path = l;
3009 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
3017 void manager_undo_generators(Manager *m) {
3020 if (!m->generator_unit_path)
3023 strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
3024 rm_rf(m->generator_unit_path, false, true);
3026 free(m->generator_unit_path);
3027 m->generator_unit_path = NULL;
3030 int manager_set_default_controllers(Manager *m, char **controllers) {
3035 if (!(l = strv_copy(controllers)))
3038 strv_free(m->default_controllers);
3039 m->default_controllers = l;
3044 void manager_recheck_syslog(Manager *m) {
3049 if (m->running_as != MANAGER_SYSTEM)
3052 if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
3055 state = SOCKET(u)->state;
3057 if (state != SOCKET_DEAD &&
3058 state != SOCKET_FAILED &&
3059 state != SOCKET_RUNNING) {
3061 /* Hmm, the socket is not set up, or is still
3062 * listening, let's better not try to use
3063 * it. Note that we have no problem if the
3064 * socket is completely down, since there
3065 * might be a foreign /dev/log socket around
3066 * and we want to make use of that.
3074 if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3075 if (TARGET(u)->state != TARGET_ACTIVE) {
3080 /* Hmm, OK, so the socket is either fully up, or fully down,
3081 * and the target is up, then let's make use of the socket */
3085 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3086 [MANAGER_SYSTEM] = "system",
3087 [MANAGER_USER] = "user"
3090 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);