1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/epoll.h>
27 #include <sys/signalfd.h>
31 #include <sys/reboot.h>
32 #include <sys/ioctl.h>
36 #include <sys/types.h>
50 #include "ratelimit.h"
52 #include "mount-setup.h"
53 #include "unit-name.h"
54 #include "dbus-unit.h"
57 #include "path-lookup.h"
59 #include "bus-errors.h"
60 #include "exit-status.h"
62 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
63 #define GC_QUEUE_ENTRIES_MAX 16
65 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
66 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
68 /* Where clients shall send notification messages to */
69 #define NOTIFY_SOCKET "/org/freedesktop/systemd1/notify"
71 static int manager_setup_notify(Manager *m) {
74 struct sockaddr_un un;
76 struct epoll_event ev;
81 m->notify_watch.type = WATCH_NOTIFY;
82 if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
83 log_error("Failed to allocate notification socket: %m");
88 sa.sa.sa_family = AF_UNIX;
91 snprintf(sa.un.sun_path+1, sizeof(sa.un.sun_path)-1, NOTIFY_SOCKET "/%llu", random_ull());
93 strncpy(sa.un.sun_path+1, NOTIFY_SOCKET, sizeof(sa.un.sun_path)-1);
95 if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
96 log_error("bind() failed: %m");
100 if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
101 log_error("SO_PASSCRED failed: %m");
107 ev.data.ptr = &m->notify_watch;
109 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
112 if (!(m->notify_socket = strdup(sa.un.sun_path+1)))
115 log_debug("Using notification socket %s", m->notify_socket);
120 static int enable_special_signals(Manager *m) {
125 /* Enable that we get SIGINT on control-alt-del */
126 if (reboot(RB_DISABLE_CAD) < 0)
127 log_warning("Failed to enable ctrl-alt-del handling: %m");
129 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
130 log_warning("Failed to open /dev/tty0: %m");
132 /* Enable that we get SIGWINCH on kbrequest */
133 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
134 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
136 close_nointr_nofail(fd);
142 static int manager_setup_signals(Manager *m) {
144 struct epoll_event ev;
149 /* We are not interested in SIGSTOP and friends. */
151 sa.sa_handler = SIG_DFL;
152 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
153 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
155 assert_se(sigemptyset(&mask) == 0);
157 sigset_add_many(&mask,
158 SIGCHLD, /* Child died */
159 SIGTERM, /* Reexecute daemon */
160 SIGHUP, /* Reload configuration */
161 SIGUSR1, /* systemd/upstart: reconnect to D-Bus */
162 SIGUSR2, /* systemd: dump status */
163 SIGINT, /* Kernel sends us this on control-alt-del */
164 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
165 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
166 SIGRTMIN+0, /* systemd: start default.target */
167 SIGRTMIN+1, /* systemd: isolate rescue.target */
168 SIGRTMIN+2, /* systemd: isolate emergency.target */
169 SIGRTMIN+3, /* systemd: start halt.target */
170 SIGRTMIN+4, /* systemd: start poweroff.target */
171 SIGRTMIN+5, /* systemd: start reboot.target */
172 SIGRTMIN+6, /* systemd: start kexec.target */
173 SIGRTMIN+13, /* systemd: Immediate halt */
174 SIGRTMIN+14, /* systemd: Immediate poweroff */
175 SIGRTMIN+15, /* systemd: Immediate reboot */
176 SIGRTMIN+16, /* systemd: Immediate kexec */
177 SIGRTMIN+20, /* systemd: enable status messages */
178 SIGRTMIN+21, /* systemd: disable status messages */
180 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
182 m->signal_watch.type = WATCH_SIGNAL;
183 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
188 ev.data.ptr = &m->signal_watch;
190 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
193 if (m->running_as == MANAGER_SYSTEM)
194 return enable_special_signals(m);
199 int manager_new(ManagerRunningAs running_as, Manager **_m) {
204 assert(running_as >= 0);
205 assert(running_as < _MANAGER_RUNNING_AS_MAX);
207 if (!(m = new0(Manager, 1)))
210 dual_timestamp_get(&m->startup_timestamp);
212 m->running_as = running_as;
213 m->name_data_slot = m->subscribed_data_slot = -1;
214 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
215 m->pin_cgroupfs_fd = -1;
221 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
222 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
224 if (!(m->environment = strv_copy(environ)))
227 if (!(m->default_controllers = strv_new("cpu", NULL)))
230 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
233 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
236 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
239 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
242 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
245 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
248 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
251 if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
254 if ((r = manager_setup_signals(m)) < 0)
257 if ((r = manager_setup_cgroup(m)) < 0)
260 if ((r = manager_setup_notify(m)) < 0)
263 /* Try to connect to the busses, if possible. */
264 if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
268 if ((m->audit_fd = audit_open()) < 0)
269 log_error("Failed to connect to audit log: %m");
280 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
286 while ((meta = m->cleanup_queue)) {
287 assert(meta->in_cleanup_queue);
289 unit_free((Unit*) meta);
297 GC_OFFSET_IN_PATH, /* This one is on the path we were traveling */
298 GC_OFFSET_UNSURE, /* No clue */
299 GC_OFFSET_GOOD, /* We still need this unit */
300 GC_OFFSET_BAD, /* We don't need this unit anymore */
304 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
311 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
312 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
313 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
316 if (u->meta.in_cleanup_queue)
319 if (unit_check_gc(u))
322 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
326 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
327 unit_gc_sweep(other, gc_marker);
329 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
332 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
339 /* We were unable to find anything out about this entry, so
340 * let's investigate it later */
341 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
342 unit_add_to_gc_queue(u);
346 /* We definitely know that this one is not useful anymore, so
347 * let's mark it for deletion */
348 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
349 unit_add_to_cleanup_queue(u);
353 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
356 static unsigned manager_dispatch_gc_queue(Manager *m) {
363 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
364 (m->gc_queue_timestamp <= 0 ||
365 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
368 log_debug("Running GC...");
370 m->gc_marker += _GC_OFFSET_MAX;
371 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
374 gc_marker = m->gc_marker;
376 while ((meta = m->gc_queue)) {
377 assert(meta->in_gc_queue);
379 unit_gc_sweep((Unit*) meta, gc_marker);
381 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
382 meta->in_gc_queue = false;
386 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
387 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
388 log_debug("Collecting %s", meta->id);
389 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
390 unit_add_to_cleanup_queue((Unit*) meta);
394 m->n_in_gc_queue = 0;
395 m->gc_queue_timestamp = 0;
400 static void manager_clear_jobs_and_units(Manager *m) {
406 while ((j = hashmap_first(m->transaction_jobs)))
409 while ((u = hashmap_first(m->units)))
412 manager_dispatch_cleanup_queue(m);
414 assert(!m->load_queue);
415 assert(!m->run_queue);
416 assert(!m->dbus_unit_queue);
417 assert(!m->dbus_job_queue);
418 assert(!m->cleanup_queue);
419 assert(!m->gc_queue);
421 assert(hashmap_isempty(m->transaction_jobs));
422 assert(hashmap_isempty(m->jobs));
423 assert(hashmap_isempty(m->units));
426 void manager_free(Manager *m) {
431 manager_clear_jobs_and_units(m);
433 for (c = 0; c < _UNIT_TYPE_MAX; c++)
434 if (unit_vtable[c]->shutdown)
435 unit_vtable[c]->shutdown(m);
437 /* If we reexecute ourselves, we keep the root cgroup
439 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
441 manager_undo_generators(m);
445 hashmap_free(m->units);
446 hashmap_free(m->jobs);
447 hashmap_free(m->transaction_jobs);
448 hashmap_free(m->watch_pids);
449 hashmap_free(m->watch_bus);
451 if (m->epoll_fd >= 0)
452 close_nointr_nofail(m->epoll_fd);
453 if (m->signal_watch.fd >= 0)
454 close_nointr_nofail(m->signal_watch.fd);
455 if (m->notify_watch.fd >= 0)
456 close_nointr_nofail(m->notify_watch.fd);
459 if (m->audit_fd >= 0)
460 audit_close(m->audit_fd);
463 free(m->notify_socket);
465 lookup_paths_free(&m->lookup_paths);
466 strv_free(m->environment);
468 strv_free(m->default_controllers);
470 hashmap_free(m->cgroup_bondings);
471 set_free_free(m->unit_path_cache);
476 int manager_enumerate(Manager *m) {
482 /* Let's ask every type to load all units from disk/kernel
483 * that it might know */
484 for (c = 0; c < _UNIT_TYPE_MAX; c++)
485 if (unit_vtable[c]->enumerate)
486 if ((q = unit_vtable[c]->enumerate(m)) < 0)
489 manager_dispatch_load_queue(m);
493 int manager_coldplug(Manager *m) {
501 /* Then, let's set up their initial state. */
502 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
508 if ((q = unit_coldplug(u)) < 0)
515 static void manager_build_unit_path_cache(Manager *m) {
522 set_free_free(m->unit_path_cache);
524 if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
525 log_error("Failed to allocate unit path cache.");
529 /* This simply builds a list of files we know exist, so that
530 * we don't always have to go to disk */
532 STRV_FOREACH(i, m->lookup_paths.unit_path) {
535 if (!(d = opendir(*i))) {
536 log_error("Failed to open directory: %m");
540 while ((de = readdir(d))) {
543 if (ignore_file(de->d_name))
546 if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
551 if ((r = set_put(m->unit_path_cache, p)) < 0) {
564 log_error("Failed to build unit path cache: %s", strerror(-r));
566 set_free_free(m->unit_path_cache);
567 m->unit_path_cache = NULL;
573 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
578 manager_run_generators(m);
580 manager_build_unit_path_cache(m);
582 /* If we will deserialize make sure that during enumeration
583 * this is already known, so we increase the counter here
586 m->n_deserializing ++;
588 /* First, enumerate what we can from all config files */
589 r = manager_enumerate(m);
591 /* Second, deserialize if there is something to deserialize */
593 if ((q = manager_deserialize(m, serialization, fds)) < 0)
596 /* Third, fire things up! */
597 if ((q = manager_coldplug(m)) < 0)
601 assert(m->n_deserializing > 0);
602 m->n_deserializing --;
608 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
612 /* Deletes one job from the transaction */
614 manager_transaction_unlink_job(m, j, delete_dependencies);
620 static void transaction_delete_unit(Manager *m, Unit *u) {
623 /* Deletes all jobs associated with a certain unit from the
626 while ((j = hashmap_get(m->transaction_jobs, u)))
627 transaction_delete_job(m, j, true);
630 static void transaction_clean_dependencies(Manager *m) {
636 /* Drops all dependencies of all installed jobs */
638 HASHMAP_FOREACH(j, m->jobs, i) {
639 while (j->subject_list)
640 job_dependency_free(j->subject_list);
641 while (j->object_list)
642 job_dependency_free(j->object_list);
645 assert(!m->transaction_anchor);
648 static void transaction_abort(Manager *m) {
653 while ((j = hashmap_first(m->transaction_jobs)))
655 transaction_delete_job(m, j, true);
659 assert(hashmap_isempty(m->transaction_jobs));
661 transaction_clean_dependencies(m);
664 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
669 /* A recursive sweep through the graph that marks all units
670 * that matter to the anchor job, i.e. are directly or
671 * indirectly a dependency of the anchor job via paths that
672 * are fully marked as mattering. */
677 l = m->transaction_anchor;
679 LIST_FOREACH(subject, l, l) {
681 /* This link does not matter */
685 /* This unit has already been marked */
686 if (l->object->generation == generation)
689 l->object->matters_to_anchor = true;
690 l->object->generation = generation;
692 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
696 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
697 JobDependency *l, *last;
701 assert(j->unit == other->unit);
702 assert(!j->installed);
704 /* Merges 'other' into 'j' and then deletes j. */
707 j->state = JOB_WAITING;
708 j->override = j->override || other->override;
710 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
712 /* Patch us in as new owner of the JobDependency objects */
714 LIST_FOREACH(subject, l, other->subject_list) {
715 assert(l->subject == other);
720 /* Merge both lists */
722 last->subject_next = j->subject_list;
724 j->subject_list->subject_prev = last;
725 j->subject_list = other->subject_list;
728 /* Patch us in as new owner of the JobDependency objects */
730 LIST_FOREACH(object, l, other->object_list) {
731 assert(l->object == other);
736 /* Merge both lists */
738 last->object_next = j->object_list;
740 j->object_list->object_prev = last;
741 j->object_list = other->object_list;
744 /* Kill the other job */
745 other->subject_list = NULL;
746 other->object_list = NULL;
747 transaction_delete_job(m, other, true);
749 static bool job_is_conflicted_by(Job *j) {
754 /* Returns true if this job is pulled in by a least one
755 * ConflictedBy dependency. */
757 LIST_FOREACH(object, l, j->object_list)
764 static int delete_one_unmergeable_job(Manager *m, Job *j) {
769 /* Tries to delete one item in the linked list
770 * j->transaction_next->transaction_next->... that conflicts
771 * with another one, in an attempt to make an inconsistent
772 * transaction work. */
774 /* We rely here on the fact that if a merged with b does not
775 * merge with c, either a or b merge with c neither */
776 LIST_FOREACH(transaction, j, j)
777 LIST_FOREACH(transaction, k, j->transaction_next) {
780 /* Is this one mergeable? Then skip it */
781 if (job_type_is_mergeable(j->type, k->type))
784 /* Ok, we found two that conflict, let's see if we can
785 * drop one of them */
786 if (!j->matters_to_anchor && !k->matters_to_anchor) {
788 /* Both jobs don't matter, so let's
789 * find the one that is smarter to
790 * remove. Let's think positive and
791 * rather remove stops then starts --
792 * except if something is being
793 * stopped because it is conflicted by
794 * another unit in which case we
795 * rather remove the start. */
797 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)));
798 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)));
800 if (j->type == JOB_STOP) {
802 if (job_is_conflicted_by(j))
807 } else if (k->type == JOB_STOP) {
809 if (job_is_conflicted_by(k))
816 } else if (!j->matters_to_anchor)
818 else if (!k->matters_to_anchor)
823 /* Ok, we can drop one, so let's do so. */
824 log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
825 transaction_delete_job(m, d, true);
832 static int transaction_merge_jobs(Manager *m, DBusError *e) {
839 /* First step, check whether any of the jobs for one specific
840 * task conflict. If so, try to drop one of them. */
841 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
846 LIST_FOREACH(transaction, k, j->transaction_next) {
847 if (job_type_merge(&t, k->type) >= 0)
850 /* OK, we could not merge all jobs for this
851 * action. Let's see if we can get rid of one
854 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
855 /* Ok, we managed to drop one, now
856 * let's ask our callers to call us
857 * again after garbage collecting */
860 /* We couldn't merge anything. Failure */
861 dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
862 job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
867 /* Second step, merge the jobs. */
868 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
872 /* Merge all transactions */
873 LIST_FOREACH(transaction, k, j->transaction_next)
874 assert_se(job_type_merge(&t, k->type) == 0);
876 /* If an active job is mergeable, merge it too */
877 if (j->unit->meta.job)
878 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
880 while ((k = j->transaction_next)) {
882 transaction_merge_and_delete_job(m, k, j, t);
885 transaction_merge_and_delete_job(m, j, k, t);
888 assert(!j->transaction_next);
889 assert(!j->transaction_prev);
895 static void transaction_drop_redundant(Manager *m) {
900 /* Goes through the transaction and removes all jobs that are
909 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
910 bool changes_something = false;
913 LIST_FOREACH(transaction, k, j) {
915 if (!job_is_anchor(k) &&
916 (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
917 (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
920 changes_something = true;
924 if (changes_something)
927 /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
928 transaction_delete_job(m, j, false);
936 static bool unit_matters_to_anchor(Unit *u, Job *j) {
938 assert(!j->transaction_prev);
940 /* Checks whether at least one of the jobs for this unit
941 * matters to the anchor. */
943 LIST_FOREACH(transaction, j, j)
944 if (j->matters_to_anchor)
950 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
957 assert(!j->transaction_prev);
959 /* Does a recursive sweep through the ordering graph, looking
960 * for a cycle. If we find cycle we try to break it. */
962 /* Have we seen this before? */
963 if (j->generation == generation) {
966 /* If the marker is NULL we have been here already and
967 * decided the job was loop-free from here. Hence
968 * shortcut things and return right-away. */
972 /* So, the marker is not NULL and we already have been
973 * here. We have a cycle. Let's try to break it. We go
974 * backwards in our path and try to find a suitable
975 * job to remove. We use the marker to find our way
976 * back, since smart how we are we stored our way back
978 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
981 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
983 log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
987 !unit_matters_to_anchor(k->unit, k)) {
988 /* Ok, we can drop this one, so let's
993 /* Check if this in fact was the beginning of
1001 log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1002 transaction_delete_unit(m, delete->unit);
1006 log_error("Unable to break cycle");
1008 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1012 /* Make the marker point to where we come from, so that we can
1013 * find our way backwards if we want to break a cycle. We use
1014 * a special marker for the beginning: we point to
1016 j->marker = from ? from : j;
1017 j->generation = generation;
1019 /* We assume that the the dependencies are bidirectional, and
1020 * hence can ignore UNIT_AFTER */
1021 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1024 /* Is there a job for this unit? */
1025 if (!(o = hashmap_get(m->transaction_jobs, u)))
1027 /* Ok, there is no job for this in the
1028 * transaction, but maybe there is already one
1030 if (!(o = u->meta.job))
1033 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1037 /* Ok, let's backtrack, and remember that this entry is not on
1038 * our path anymore. */
1044 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1053 /* Check if the ordering graph is cyclic. If it is, try to fix
1054 * that up by dropping one of the jobs. */
1056 g = (*generation)++;
1058 HASHMAP_FOREACH(j, m->transaction_jobs, i)
1059 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1065 static void transaction_collect_garbage(Manager *m) {
1070 /* Drop jobs that are not required by any other job */
1078 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1079 if (j->object_list) {
1080 /* log_debug("Keeping job %s/%s because of %s/%s", */
1081 /* j->unit->meta.id, job_type_to_string(j->type), */
1082 /* j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1083 /* j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1087 /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1088 transaction_delete_job(m, j, true);
1096 static int transaction_is_destructive(Manager *m, DBusError *e) {
1102 /* Checks whether applying this transaction means that
1103 * existing jobs would be replaced */
1105 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1108 assert(!j->transaction_prev);
1109 assert(!j->transaction_next);
1111 if (j->unit->meta.job &&
1112 j->unit->meta.job != j &&
1113 !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1115 dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1123 static void transaction_minimize_impact(Manager *m) {
1127 /* Drops all unnecessary jobs that reverse already active jobs
1128 * or that stop a running service. */
1136 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1137 LIST_FOREACH(transaction, j, j) {
1138 bool stops_running_service, changes_existing_job;
1140 /* If it matters, we shouldn't drop it */
1141 if (j->matters_to_anchor)
1144 /* Would this stop a running service?
1145 * Would this change an existing job?
1146 * If so, let's drop this entry */
1148 stops_running_service =
1149 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1151 changes_existing_job =
1152 j->unit->meta.job &&
1153 job_type_is_conflicting(j->type, j->unit->meta.job->type);
1155 if (!stops_running_service && !changes_existing_job)
1158 if (stops_running_service)
1159 log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1161 if (changes_existing_job)
1162 log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1164 /* Ok, let's get rid of this */
1165 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1167 transaction_delete_job(m, j, true);
1179 static int transaction_apply(Manager *m) {
1184 /* Moves the transaction jobs to the set of active jobs */
1186 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1188 assert(!j->transaction_prev);
1189 assert(!j->transaction_next);
1194 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1198 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1200 /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1204 if (j->unit->meta.job)
1205 job_free(j->unit->meta.job);
1207 j->unit->meta.job = j;
1208 j->installed = true;
1209 m->n_installed_jobs ++;
1211 /* We're fully installed. Now let's free data we don't
1214 assert(!j->transaction_next);
1215 assert(!j->transaction_prev);
1217 job_add_to_run_queue(j);
1218 job_add_to_dbus_queue(j);
1221 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1224 /* As last step, kill all remaining job dependencies. */
1225 transaction_clean_dependencies(m);
1231 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1235 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1241 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1243 unsigned generation = 1;
1247 /* This applies the changes recorded in transaction_jobs to
1248 * the actual list of jobs, if possible. */
1250 /* First step: figure out which jobs matter */
1251 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1253 /* Second step: Try not to stop any running services if
1254 * we don't have to. Don't try to reverse running
1255 * jobs if we don't have to. */
1256 if (mode == JOB_FAIL)
1257 transaction_minimize_impact(m);
1259 /* Third step: Drop redundant jobs */
1260 transaction_drop_redundant(m);
1263 /* Fourth step: Let's remove unneeded jobs that might
1265 transaction_collect_garbage(m);
1267 /* Fifth step: verify order makes sense and correct
1268 * cycles if necessary and possible */
1269 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1273 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1277 /* Let's see if the resulting transaction ordering
1278 * graph is still cyclic... */
1282 /* Sixth step: let's drop unmergeable entries if
1283 * necessary and possible, merge entries we can
1285 if ((r = transaction_merge_jobs(m, e)) >= 0)
1289 log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1293 /* Seventh step: an entry got dropped, let's garbage
1294 * collect its dependencies. */
1295 transaction_collect_garbage(m);
1297 /* Let's see if the resulting transaction still has
1298 * unmergeable entries ... */
1301 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1302 transaction_drop_redundant(m);
1304 /* Ninth step: check whether we can actually apply this */
1305 if (mode == JOB_FAIL)
1306 if ((r = transaction_is_destructive(m, e)) < 0) {
1307 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1311 /* Tenth step: apply changes */
1312 if ((r = transaction_apply(m)) < 0) {
1313 log_warning("Failed to apply transaction: %s", strerror(-r));
1317 assert(hashmap_isempty(m->transaction_jobs));
1318 assert(!m->transaction_anchor);
1323 transaction_abort(m);
1327 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1333 /* Looks for an existing prospective job and returns that. If
1334 * it doesn't exist it is created and added to the prospective
1337 f = hashmap_get(m->transaction_jobs, unit);
1339 LIST_FOREACH(transaction, j, f) {
1340 assert(j->unit == unit);
1342 if (j->type == type) {
1349 if (unit->meta.job && unit->meta.job->type == type)
1351 else if (!(j = job_new(m, type, unit)))
1356 j->matters_to_anchor = false;
1357 j->override = override;
1359 LIST_PREPEND(Job, transaction, f, j);
1361 if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1369 /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1374 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1378 if (j->transaction_prev)
1379 j->transaction_prev->transaction_next = j->transaction_next;
1380 else if (j->transaction_next)
1381 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1383 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1385 if (j->transaction_next)
1386 j->transaction_next->transaction_prev = j->transaction_prev;
1388 j->transaction_prev = j->transaction_next = NULL;
1390 while (j->subject_list)
1391 job_dependency_free(j->subject_list);
1393 while (j->object_list) {
1394 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1396 job_dependency_free(j->object_list);
1398 if (other && delete_dependencies) {
1399 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1400 other->unit->meta.id, job_type_to_string(other->type),
1401 j->unit->meta.id, job_type_to_string(j->type));
1402 transaction_delete_job(m, other, delete_dependencies);
1407 static int transaction_add_job_and_dependencies(
1425 assert(type < _JOB_TYPE_MAX);
1428 /* log_debug("Pulling in %s/%s from %s/%s", */
1429 /* unit->meta.id, job_type_to_string(type), */
1430 /* by ? by->unit->meta.id : "NA", */
1431 /* by ? job_type_to_string(by->type) : "NA"); */
1433 if (unit->meta.load_state != UNIT_LOADED &&
1434 unit->meta.load_state != UNIT_ERROR &&
1435 unit->meta.load_state != UNIT_MASKED) {
1436 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1440 if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1441 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1442 "Unit %s failed to load: %s. "
1443 "See system logs and 'systemctl status' for details.",
1445 strerror(-unit->meta.load_error));
1449 if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1450 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1454 if (!unit_job_is_applicable(unit, type)) {
1455 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);
1459 /* First add the job. */
1460 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1463 ret->ignore_deps = ret->ignore_deps || ignore_deps;
1465 /* Then, add a link to the job. */
1466 if (!job_dependency_new(by, ret, matters, conflicts))
1469 if (is_new && !ignore_deps) {
1472 /* If we are following some other unit, make sure we
1473 * add all dependencies of everybody following. */
1474 if (unit_following_set(ret->unit, &following) > 0) {
1475 SET_FOREACH(dep, following, i)
1476 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, e, NULL)) < 0) {
1477 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1483 set_free(following);
1486 /* Finally, recursively add in all dependencies. */
1487 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1488 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1489 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, e, NULL)) < 0) {
1497 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1498 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, e, NULL)) < 0) {
1507 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1508 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, e, NULL)) < 0) {
1509 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1515 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1516 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, e, NULL)) < 0) {
1517 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1523 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1524 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, e, NULL)) < 0) {
1533 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1534 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, e, NULL)) < 0) {
1535 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1541 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1542 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, e, NULL)) < 0) {
1551 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1552 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, e, NULL)) < 0) {
1553 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1559 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1561 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1562 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, e, NULL)) < 0) {
1571 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1572 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, e, NULL)) < 0) {
1582 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1594 static int transaction_add_isolate_jobs(Manager *m) {
1602 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1604 /* ignore aliases */
1605 if (u->meta.id != k)
1608 if (UNIT_VTABLE(u)->no_isolate)
1611 /* No need to stop inactive jobs */
1612 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1615 /* Is there already something listed for this? */
1616 if (hashmap_get(m->transaction_jobs, u))
1619 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, NULL, NULL)) < 0)
1620 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1626 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1631 assert(type < _JOB_TYPE_MAX);
1633 assert(mode < _JOB_MODE_MAX);
1635 if (mode == JOB_ISOLATE && type != JOB_START) {
1636 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1640 if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1641 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1645 log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1647 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false, mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1648 transaction_abort(m);
1652 if (mode == JOB_ISOLATE)
1653 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1654 transaction_abort(m);
1658 if ((r = transaction_activate(m, mode, e)) < 0)
1661 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1669 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1674 assert(type < _JOB_TYPE_MAX);
1676 assert(mode < _JOB_MODE_MAX);
1678 if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1681 return manager_add_job(m, type, unit, mode, override, e, _ret);
1684 Job *manager_get_job(Manager *m, uint32_t id) {
1687 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1690 Unit *manager_get_unit(Manager *m, const char *name) {
1694 return hashmap_get(m->units, name);
1697 unsigned manager_dispatch_load_queue(Manager *m) {
1703 /* Make sure we are not run recursively */
1704 if (m->dispatching_load_queue)
1707 m->dispatching_load_queue = true;
1709 /* Dispatches the load queue. Takes a unit from the queue and
1710 * tries to load its data until the queue is empty */
1712 while ((meta = m->load_queue)) {
1713 assert(meta->in_load_queue);
1715 unit_load((Unit*) meta);
1719 m->dispatching_load_queue = false;
1723 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1728 assert(name || path);
1730 /* This will prepare the unit for loading, but not actually
1731 * load anything from disk. */
1733 if (path && !is_path(path)) {
1734 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1739 name = file_name_from_path(path);
1741 if (!unit_name_is_valid(name, false)) {
1742 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1746 if ((ret = manager_get_unit(m, name))) {
1751 if (!(ret = unit_new(m)))
1755 if (!(ret->meta.fragment_path = strdup(path))) {
1760 if ((r = unit_add_name(ret, name)) < 0) {
1765 unit_add_to_load_queue(ret);
1766 unit_add_to_dbus_queue(ret);
1767 unit_add_to_gc_queue(ret);
1775 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1780 /* This will load the service information files, but not actually
1781 * start any services or anything. */
1783 if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1786 manager_dispatch_load_queue(m);
1789 *_ret = unit_follow_merge(*_ret);
1794 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1801 HASHMAP_FOREACH(j, s->jobs, i)
1802 job_dump(j, f, prefix);
1805 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1813 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1814 if (u->meta.id == t)
1815 unit_dump(u, f, prefix);
1818 void manager_clear_jobs(Manager *m) {
1823 transaction_abort(m);
1825 while ((j = hashmap_first(m->jobs)))
1826 job_finish_and_invalidate(j, JOB_CANCELED);
1829 unsigned manager_dispatch_run_queue(Manager *m) {
1833 if (m->dispatching_run_queue)
1836 m->dispatching_run_queue = true;
1838 while ((j = m->run_queue)) {
1839 assert(j->installed);
1840 assert(j->in_run_queue);
1842 job_run_and_invalidate(j);
1846 m->dispatching_run_queue = false;
1850 unsigned manager_dispatch_dbus_queue(Manager *m) {
1857 if (m->dispatching_dbus_queue)
1860 m->dispatching_dbus_queue = true;
1862 while ((meta = m->dbus_unit_queue)) {
1863 assert(meta->in_dbus_queue);
1865 bus_unit_send_change_signal((Unit*) meta);
1869 while ((j = m->dbus_job_queue)) {
1870 assert(j->in_dbus_queue);
1872 bus_job_send_change_signal(j);
1876 m->dispatching_dbus_queue = false;
1880 static int manager_process_notify_fd(Manager *m) {
1887 struct msghdr msghdr;
1889 struct ucred *ucred;
1891 struct cmsghdr cmsghdr;
1892 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1898 iovec.iov_base = buf;
1899 iovec.iov_len = sizeof(buf)-1;
1903 msghdr.msg_iov = &iovec;
1904 msghdr.msg_iovlen = 1;
1905 msghdr.msg_control = &control;
1906 msghdr.msg_controllen = sizeof(control);
1908 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1912 if (errno == EAGAIN || errno == EINTR)
1918 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1919 control.cmsghdr.cmsg_level != SOL_SOCKET ||
1920 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1921 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1922 log_warning("Received notify message without credentials. Ignoring.");
1926 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1928 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1929 if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1930 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1934 assert((size_t) n < sizeof(buf));
1936 if (!(tags = strv_split(buf, "\n\r")))
1939 log_debug("Got notification message for unit %s", u->meta.id);
1941 if (UNIT_VTABLE(u)->notify_message)
1942 UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1950 static int manager_dispatch_sigchld(Manager *m) {
1960 /* First we call waitd() for a PID and do not reap the
1961 * zombie. That way we can still access /proc/$PID for
1962 * it while it is a zombie. */
1963 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1965 if (errno == ECHILD)
1977 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1980 get_process_name(si.si_pid, &name);
1981 log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1985 /* Let's flush any message the dying child might still
1986 * have queued for us. This ensures that the process
1987 * still exists in /proc so that we can figure out
1988 * which cgroup and hence unit it belongs to. */
1989 if ((r = manager_process_notify_fd(m)) < 0)
1992 /* And now figure out the unit this belongs to */
1993 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
1994 u = cgroup_unit_by_pid(m, si.si_pid);
1996 /* And now, we actually reap the zombie. */
1997 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2004 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2007 log_debug("Child %lu died (code=%s, status=%i/%s)",
2008 (long unsigned) si.si_pid,
2009 sigchld_code_to_string(si.si_code),
2011 strna(si.si_code == CLD_EXITED
2012 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2013 : signal_to_string(si.si_status)));
2018 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2020 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2021 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2027 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2031 dbus_error_init(&error);
2033 log_debug("Activating special unit %s", name);
2035 if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2036 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2038 dbus_error_free(&error);
2043 static int manager_process_signal_fd(Manager *m) {
2045 struct signalfd_siginfo sfsi;
2046 bool sigchld = false;
2051 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2056 if (errno == EINTR || errno == EAGAIN)
2062 log_debug("Received SIG%s", strna(signal_to_string(sfsi.ssi_signo)));
2064 switch (sfsi.ssi_signo) {
2071 if (m->running_as == MANAGER_SYSTEM) {
2072 /* This is for compatibility with the
2073 * original sysvinit */
2074 m->exit_code = MANAGER_REEXECUTE;
2081 if (m->running_as == MANAGER_SYSTEM) {
2082 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2086 /* Run the exit target if there is one, if not, just exit. */
2087 if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2088 m->exit_code = MANAGER_EXIT;
2095 if (m->running_as == MANAGER_SYSTEM)
2096 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2098 /* This is a nop on non-init */
2102 if (m->running_as == MANAGER_SYSTEM)
2103 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2105 /* This is a nop on non-init */
2111 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2113 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2114 log_info("Trying to reconnect to bus...");
2118 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2119 log_info("Loading D-Bus service...");
2120 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2131 if (!(f = open_memstream(&dump, &size))) {
2132 log_warning("Failed to allocate memory stream.");
2136 manager_dump_units(m, f, "\t");
2137 manager_dump_jobs(m, f, "\t");
2142 log_warning("Failed to write status stream");
2147 log_dump(LOG_INFO, dump);
2154 m->exit_code = MANAGER_RELOAD;
2158 /* Starting SIGRTMIN+0 */
2159 static const char * const target_table[] = {
2160 [0] = SPECIAL_DEFAULT_TARGET,
2161 [1] = SPECIAL_RESCUE_TARGET,
2162 [2] = SPECIAL_EMERGENCY_TARGET,
2163 [3] = SPECIAL_HALT_TARGET,
2164 [4] = SPECIAL_POWEROFF_TARGET,
2165 [5] = SPECIAL_REBOOT_TARGET,
2166 [6] = SPECIAL_KEXEC_TARGET
2169 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2170 static const ManagerExitCode code_table[] = {
2172 [1] = MANAGER_POWEROFF,
2173 [2] = MANAGER_REBOOT,
2177 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2178 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2179 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2180 (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2184 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2185 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2186 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2190 switch (sfsi.ssi_signo - SIGRTMIN) {
2193 log_debug("Enabling showing of status.");
2194 m->show_status = true;
2198 log_debug("Disabling showing of status.");
2199 m->show_status = false;
2203 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2210 return manager_dispatch_sigchld(m);
2215 static int process_event(Manager *m, struct epoll_event *ev) {
2222 assert(w = ev->data.ptr);
2224 if (w->type == WATCH_INVALID)
2231 /* An incoming signal? */
2232 if (ev->events != EPOLLIN)
2235 if ((r = manager_process_signal_fd(m)) < 0)
2242 /* An incoming daemon notification event? */
2243 if (ev->events != EPOLLIN)
2246 if ((r = manager_process_notify_fd(m)) < 0)
2253 /* Some fd event, to be dispatched to the units */
2254 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2257 case WATCH_UNIT_TIMER:
2258 case WATCH_JOB_TIMER: {
2262 /* Some timer event, to be dispatched to the units */
2263 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2265 if (k < 0 && (errno == EINTR || errno == EAGAIN))
2268 return k < 0 ? -errno : -EIO;
2271 if (w->type == WATCH_UNIT_TIMER)
2272 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2274 job_timer_event(w->data.job, v, w);
2279 /* Some mount table change, intended for the mount subsystem */
2280 mount_fd_event(m, ev->events);
2284 /* Some swap table change, intended for the swap subsystem */
2285 swap_fd_event(m, ev->events);
2289 /* Some notification from udev, intended for the device subsystem */
2290 device_fd_event(m, ev->events);
2293 case WATCH_DBUS_WATCH:
2294 bus_watch_event(m, w, ev->events);
2297 case WATCH_DBUS_TIMEOUT:
2298 bus_timeout_event(m, w, ev->events);
2302 log_error("event type=%i", w->type);
2303 assert_not_reached("Unknown epoll event type.");
2309 int manager_loop(Manager *m) {
2312 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
2315 m->exit_code = MANAGER_RUNNING;
2317 /* Release the path cache */
2318 set_free_free(m->unit_path_cache);
2319 m->unit_path_cache = NULL;
2321 manager_check_finished(m);
2323 /* There might still be some zombies hanging around from
2324 * before we were exec()'ed. Leat's reap them */
2325 if ((r = manager_dispatch_sigchld(m)) < 0)
2328 while (m->exit_code == MANAGER_RUNNING) {
2329 struct epoll_event event;
2332 if (!ratelimit_test(&rl)) {
2333 /* Yay, something is going seriously wrong, pause a little */
2334 log_warning("Looping too fast. Throttling execution a little.");
2338 if (manager_dispatch_load_queue(m) > 0)
2341 if (manager_dispatch_run_queue(m) > 0)
2344 if (bus_dispatch(m) > 0)
2347 if (manager_dispatch_cleanup_queue(m) > 0)
2350 if (manager_dispatch_gc_queue(m) > 0)
2353 if (manager_dispatch_dbus_queue(m) > 0)
2356 if (swap_dispatch_reload(m) > 0)
2359 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2369 if ((r = process_event(m, &event)) < 0)
2373 return m->exit_code;
2376 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2384 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2387 if (!(n = bus_path_unescape(s+31)))
2390 u = manager_get_unit(m, n);
2401 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2410 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2413 if ((r = safe_atou(s + 30, &id)) < 0)
2416 if (!(j = manager_get_job(m, id)))
2424 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2429 if (m->audit_fd < 0)
2432 /* Don't generate audit events if the service was already
2433 * started and we're just deserializing */
2434 if (m->n_deserializing > 0)
2437 if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2438 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2442 if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0)
2443 log_error("Failed to send audit message: %m");
2450 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2452 union sockaddr_union sa;
2454 char *message = NULL;
2456 /* Don't generate plymouth 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 &&
2465 u->meta.type != UNIT_MOUNT &&
2466 u->meta.type != UNIT_SWAP)
2469 /* We set SOCK_NONBLOCK here so that we rather drop the
2470 * message then wait for plymouth */
2471 if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2472 log_error("socket() failed: %m");
2477 sa.sa.sa_family = AF_UNIX;
2478 strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2479 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2481 if (errno != EPIPE &&
2484 errno != ECONNREFUSED &&
2485 errno != ECONNRESET &&
2486 errno != ECONNABORTED)
2487 log_error("connect() failed: %m");
2492 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2493 log_error("Out of memory");
2498 if (write(fd, message, n + 1) != n + 1) {
2500 if (errno != EPIPE &&
2503 errno != ECONNREFUSED &&
2504 errno != ECONNRESET &&
2505 errno != ECONNABORTED)
2506 log_error("Failed to write Plymouth message: %m");
2513 close_nointr_nofail(fd);
2518 void manager_dispatch_bus_name_owner_changed(
2521 const char* old_owner,
2522 const char *new_owner) {
2529 if (!(u = hashmap_get(m->watch_bus, name)))
2532 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2535 void manager_dispatch_bus_query_pid_done(
2546 if (!(u = hashmap_get(m->watch_bus, name)))
2549 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2552 int manager_open_serialization(Manager *m, FILE **_f) {
2560 if (m->running_as == MANAGER_SYSTEM)
2561 asprintf(&path, "/dev/.run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2563 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2568 saved_umask = umask(0077);
2569 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2579 log_debug("Serializing state to %s", path);
2582 if (!(f = fdopen(fd, "w+")) < 0)
2590 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2600 dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2601 dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2602 dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2606 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2607 if (u->meta.id != t)
2610 if (!unit_can_serialize(u))
2614 fputs(u->meta.id, f);
2617 if ((r = unit_serialize(u, f, fds)) < 0)
2627 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2633 log_debug("Deserializing state...");
2635 m->n_deserializing ++;
2638 char line[1024], *l;
2640 if (!fgets(line, sizeof(line), f)) {
2655 if (startswith(l, "initrd-timestamp="))
2656 dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2657 else if (startswith(l, "startup-timestamp="))
2658 dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2659 else if (startswith(l, "finish-timestamp="))
2660 dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2662 log_debug("Unknown serialization item '%s'", l);
2667 char name[UNIT_NAME_MAX+2];
2670 if (!fgets(name, sizeof(name), f)) {
2681 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2684 if ((r = unit_deserialize(u, f, fds)) < 0)
2694 assert(m->n_deserializing > 0);
2695 m->n_deserializing --;
2700 int manager_reload(Manager *m) {
2707 if ((r = manager_open_serialization(m, &f)) < 0)
2710 if (!(fds = fdset_new())) {
2715 if ((r = manager_serialize(m, f, fds)) < 0)
2718 if (fseeko(f, 0, SEEK_SET) < 0) {
2723 /* From here on there is no way back. */
2724 manager_clear_jobs_and_units(m);
2725 manager_undo_generators(m);
2727 /* Find new unit paths */
2728 lookup_paths_free(&m->lookup_paths);
2729 if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2732 manager_run_generators(m);
2734 manager_build_unit_path_cache(m);
2736 m->n_deserializing ++;
2738 /* First, enumerate what we can from all config files */
2739 if ((q = manager_enumerate(m)) < 0)
2742 /* Second, deserialize our stored data */
2743 if ((q = manager_deserialize(m, f, fds)) < 0)
2749 /* Third, fire things up! */
2750 if ((q = manager_coldplug(m)) < 0)
2753 assert(m->n_deserializing > 0);
2754 m->n_deserializing ++;
2766 bool manager_is_booting_or_shutting_down(Manager *m) {
2771 /* Is the initial job still around? */
2772 if (manager_get_job(m, 1))
2775 /* Is there a job for the shutdown target? */
2776 if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2777 return !!u->meta.job;
2782 void manager_reset_failed(Manager *m) {
2788 HASHMAP_FOREACH(u, m->units, i)
2789 unit_reset_failed(u);
2792 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2798 /* Returns true if the unit is inactive or going down */
2799 if (!(u = manager_get_unit(m, name)))
2802 return unit_pending_inactive(u);
2805 void manager_check_finished(Manager *m) {
2806 char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2810 if (dual_timestamp_is_set(&m->finish_timestamp))
2813 if (hashmap_size(m->jobs) > 0)
2816 dual_timestamp_get(&m->finish_timestamp);
2818 if (m->running_as == MANAGER_SYSTEM) {
2819 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2820 log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2821 format_timespan(kernel, sizeof(kernel),
2822 m->initrd_timestamp.monotonic),
2823 format_timespan(initrd, sizeof(initrd),
2824 m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2825 format_timespan(userspace, sizeof(userspace),
2826 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2827 format_timespan(sum, sizeof(sum),
2828 m->finish_timestamp.monotonic));
2830 log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2831 format_timespan(kernel, sizeof(kernel),
2832 m->startup_timestamp.monotonic),
2833 format_timespan(userspace, sizeof(userspace),
2834 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2835 format_timespan(sum, sizeof(sum),
2836 m->finish_timestamp.monotonic));
2838 log_debug("Startup finished in %s.",
2839 format_timespan(userspace, sizeof(userspace),
2840 m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2844 void manager_run_generators(Manager *m) {
2846 const char *generator_path;
2847 const char *argv[3];
2851 generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2852 if (!(d = opendir(generator_path))) {
2854 if (errno == ENOENT)
2857 log_error("Failed to enumerate generator directory: %m");
2861 if (!m->generator_unit_path) {
2863 char system_path[] = "/dev/.run/systemd/generator-XXXXXX",
2864 user_path[] = "/tmp/systemd-generator-XXXXXX";
2866 if (!(p = mkdtemp(m->running_as == MANAGER_SYSTEM ? system_path : user_path))) {
2867 log_error("Failed to generate generator directory: %m");
2871 if (!(m->generator_unit_path = strdup(p))) {
2872 log_error("Failed to allocate generator unit path.");
2877 argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2878 argv[1] = m->generator_unit_path;
2881 execute_directory(generator_path, d, (char**) argv);
2883 if (rmdir(m->generator_unit_path) >= 0) {
2884 /* Uh? we were able to remove this dir? I guess that
2885 * means the directory was empty, hence let's shortcut
2888 free(m->generator_unit_path);
2889 m->generator_unit_path = NULL;
2893 if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
2896 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
2897 log_error("Failed to add generator directory to unit search path: %m");
2901 strv_free(m->lookup_paths.unit_path);
2902 m->lookup_paths.unit_path = l;
2904 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
2912 void manager_undo_generators(Manager *m) {
2915 if (!m->generator_unit_path)
2918 strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
2919 rm_rf(m->generator_unit_path, false, true);
2921 free(m->generator_unit_path);
2922 m->generator_unit_path = NULL;
2925 int manager_set_default_controllers(Manager *m, char **controllers) {
2930 if (!(l = strv_copy(controllers)))
2933 strv_free(m->default_controllers);
2934 m->default_controllers = l;
2939 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2940 [MANAGER_SYSTEM] = "system",
2941 [MANAGER_USER] = "user"
2944 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);