1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
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>
32 #include <sys/reboot.h>
33 #include <sys/ioctl.h>
35 #include <libcgroup.h>
38 #include <sys/types.h>
47 #include "ratelimit.h"
49 #include "mount-setup.h"
50 #include "utmp-wtmp.h"
51 #include "unit-name.h"
52 #include "dbus-unit.h"
56 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
57 #define GC_QUEUE_ENTRIES_MAX 16
59 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
60 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
62 static int enable_special_signals(Manager *m) {
67 /* Enable that we get SIGINT on control-alt-del */
68 if (reboot(RB_DISABLE_CAD) < 0)
69 log_warning("Failed to enable ctrl-alt-del handling: %m");
71 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
72 log_warning("Failed to open /dev/tty0: %m");
74 /* Enable that we get SIGWINCH on kbrequest */
75 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
76 log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
78 close_nointr_nofail(fd);
84 static int manager_setup_signals(Manager *m) {
86 struct epoll_event ev;
91 /* We are not interested in SIGSTOP and friends. */
93 sa.sa_handler = SIG_DFL;
94 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
95 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
97 assert_se(sigemptyset(&mask) == 0);
98 assert_se(sigaddset(&mask, SIGCHLD) == 0);
99 assert_se(sigaddset(&mask, SIGTERM) == 0);
100 assert_se(sigaddset(&mask, SIGHUP) == 0);
101 assert_se(sigaddset(&mask, SIGUSR1) == 0);
102 assert_se(sigaddset(&mask, SIGUSR2) == 0);
103 assert_se(sigaddset(&mask, SIGINT) == 0); /* Kernel sends us this on control-alt-del */
104 assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */
105 assert_se(sigaddset(&mask, SIGPWR) == 0); /* Some kernel drivers and upsd send us this on power failure */
106 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
108 m->signal_watch.type = WATCH_SIGNAL;
109 if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
114 ev.data.ptr = &m->signal_watch;
116 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
119 if (m->running_as == MANAGER_INIT)
120 return enable_special_signals(m);
125 static char** session_dirs(void) {
126 const char *home, *e;
127 char *config_home = NULL, *data_home = NULL;
128 char **config_dirs = NULL, **data_dirs = NULL;
129 char **r = NULL, **t;
131 /* Implement the mechanisms defined in
133 * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
135 * We look in both the config and the data dirs because we
136 * want to encourage that distributors ship their unit files
137 * as data, and allow overriding as configuration.
140 home = getenv("HOME");
142 if ((e = getenv("XDG_CONFIG_HOME"))) {
143 if (asprintf(&config_home, "%s/systemd/session", e) < 0)
147 if (asprintf(&config_home, "%s/.config/systemd/session", home) < 0)
151 if ((e = getenv("XDG_CONFIG_DIRS")))
152 if (!(config_dirs = strv_split(e, ":")))
155 /* We don't treat /etc/xdg/systemd here as the spec
156 * suggests because we assume that that is a link to
157 * /etc/systemd/ anyway. */
159 if ((e = getenv("XDG_DATA_HOME"))) {
160 if (asprintf(&data_home, "%s/systemd/session", e) < 0)
164 if (asprintf(&data_home, "%s/.local/share/systemd/session", home) < 0)
167 /* There is really no need for two unit dirs in $HOME,
168 * except to be fully compliant with the XDG spec. We
169 * now try to link the two dirs, so that we can
170 * minimize disk seeks a little. Further down we'll
171 * then filter out this link, if it is actually is
174 mkdir_parents(data_home, 0777);
175 symlink("../../../.config/systemd/session", data_home);
178 if ((e = getenv("XDG_DATA_DIRS")))
179 data_dirs = strv_split(e, ":");
181 data_dirs = strv_new("/usr/local/share", "/usr/share", NULL);
186 /* Now merge everything we found. */
188 if (!(t = strv_append(r, config_home)))
194 if (!(t = strv_merge_concat(r, config_dirs, "/systemd/session")))
199 if (!(t = strv_append(r, SESSION_CONFIG_UNIT_PATH)))
205 if (!(t = strv_append(r, data_home)))
211 if (!(t = strv_merge_concat(r, data_dirs, "/systemd/session")))
216 if (!(t = strv_append(r, SESSION_DATA_UNIT_PATH)))
221 if (!strv_path_make_absolute_cwd(r))
226 strv_free(config_dirs);
228 strv_free(data_dirs);
238 static int manager_find_paths(Manager *m) {
244 /* First priority is whatever has been passed to us via env
246 if ((e = getenv("SYSTEMD_UNIT_PATH")))
247 if (!(m->unit_path = split_path_and_make_absolute(e)))
250 if (strv_isempty(m->unit_path)) {
252 /* Nothing is set, so let's figure something out. */
253 strv_free(m->unit_path);
255 if (m->running_as == MANAGER_SESSION) {
256 if (!(m->unit_path = session_dirs()))
259 if (!(m->unit_path = strv_new(
260 SYSTEM_CONFIG_UNIT_PATH, /* /etc/systemd/system/ */
261 SYSTEM_DATA_UNIT_PATH, /* /lib/systemd/system/ */
266 if (m->running_as == MANAGER_INIT) {
267 /* /etc/init.d/ compatibility does not matter to users */
269 if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
270 if (!(m->sysvinit_path = split_path_and_make_absolute(e)))
273 if (strv_isempty(m->sysvinit_path)) {
274 strv_free(m->sysvinit_path);
276 if (!(m->sysvinit_path = strv_new(
277 SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
282 if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
283 if (!(m->sysvrcnd_path = split_path_and_make_absolute(e)))
286 if (strv_isempty(m->sysvrcnd_path)) {
287 strv_free(m->sysvrcnd_path);
289 if (!(m->sysvrcnd_path = strv_new(
290 SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
297 if (!strv_path_canonicalize(m->unit_path))
300 if (m->sysvinit_path)
301 if (!strv_path_canonicalize(m->sysvinit_path))
304 if (m->sysvrcnd_path)
305 if (!strv_path_canonicalize(m->sysvrcnd_path))
308 strv_uniq(m->unit_path);
309 strv_uniq(m->sysvinit_path);
310 strv_uniq(m->sysvrcnd_path);
312 if (!strv_isempty(m->unit_path)) {
314 if (!(t = strv_join(m->unit_path, "\n\t")))
316 log_debug("Looking for unit files in:\n\t%s", t);
319 log_debug("Ignoring unit files.");
320 strv_free(m->unit_path);
324 if (!strv_isempty(m->sysvinit_path)) {
326 if (!(t = strv_join(m->sysvinit_path, "\n\t")))
329 log_debug("Looking for SysV init scripts in:\n\t%s", t);
332 log_debug("Ignoring SysV init scripts.");
333 strv_free(m->sysvinit_path);
334 m->sysvinit_path = NULL;
337 if (!strv_isempty(m->sysvrcnd_path)) {
339 if (!(t = strv_join(m->sysvrcnd_path, "\n\t")))
342 log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
345 log_debug("Ignoring SysV rcN.d links.");
346 strv_free(m->sysvrcnd_path);
347 m->sysvrcnd_path = NULL;
353 int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **_m) {
358 assert(running_as >= 0);
359 assert(running_as < _MANAGER_RUNNING_AS_MAX);
361 if (!(m = new0(Manager, 1)))
364 timestamp_get(&m->startup_timestamp);
366 m->running_as = running_as;
367 m->confirm_spawn = confirm_spawn;
368 m->name_data_slot = -1;
369 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
371 m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = -1;
372 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
374 if (!(m->environment = strv_copy(environ)))
377 if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
380 if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
383 if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
386 if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
389 if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
392 if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
395 if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
398 if ((r = manager_find_paths(m)) < 0)
401 if ((r = manager_setup_signals(m)) < 0)
404 if ((r = manager_setup_cgroup(m)) < 0)
407 /* Try to connect to the busses, if possible. */
408 if ((r = bus_init_system(m)) < 0 ||
409 (r = bus_init_api(m)) < 0)
420 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
426 while ((meta = m->cleanup_queue)) {
427 assert(meta->in_cleanup_queue);
429 unit_free(UNIT(meta));
437 GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */
438 GC_OFFSET_UNSURE, /* No clue */
439 GC_OFFSET_GOOD, /* We still need this unit */
440 GC_OFFSET_BAD, /* We don't need this unit anymore */
444 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
451 if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
452 u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
453 u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
456 if (u->meta.in_cleanup_queue)
459 if (unit_check_gc(u))
462 u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
466 SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
467 unit_gc_sweep(other, gc_marker);
469 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
472 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
479 /* We were unable to find anything out about this entry, so
480 * let's investigate it later */
481 u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
482 unit_add_to_gc_queue(u);
486 /* We definitely know that this one is not useful anymore, so
487 * let's mark it for deletion */
488 u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
489 unit_add_to_cleanup_queue(u);
493 u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
496 static unsigned manager_dispatch_gc_queue(Manager *m) {
503 if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
504 (m->gc_queue_timestamp <= 0 ||
505 (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
508 log_debug("Running GC...");
510 m->gc_marker += _GC_OFFSET_MAX;
511 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
514 gc_marker = m->gc_marker;
516 while ((meta = m->gc_queue)) {
517 assert(meta->in_gc_queue);
519 unit_gc_sweep(UNIT(meta), gc_marker);
521 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
522 meta->in_gc_queue = false;
526 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
527 meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
528 log_debug("Collecting %s", meta->id);
529 meta->gc_marker = gc_marker + GC_OFFSET_BAD;
530 unit_add_to_cleanup_queue(UNIT(meta));
534 m->n_in_gc_queue = 0;
535 m->gc_queue_timestamp = 0;
540 static void manager_clear_jobs_and_units(Manager *m) {
546 while ((j = hashmap_first(m->transaction_jobs)))
549 while ((u = hashmap_first(m->units)))
553 void manager_free(Manager *m) {
558 manager_dispatch_cleanup_queue(m);
559 manager_clear_jobs_and_units(m);
561 for (c = 0; c < _UNIT_TYPE_MAX; c++)
562 if (unit_vtable[c]->shutdown)
563 unit_vtable[c]->shutdown(m);
565 /* If we reexecute ourselves, we keep the root cgroup
567 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
572 hashmap_free(m->units);
573 hashmap_free(m->jobs);
574 hashmap_free(m->transaction_jobs);
575 hashmap_free(m->watch_pids);
576 hashmap_free(m->watch_bus);
578 if (m->epoll_fd >= 0)
579 close_nointr_nofail(m->epoll_fd);
580 if (m->signal_watch.fd >= 0)
581 close_nointr_nofail(m->signal_watch.fd);
583 strv_free(m->unit_path);
584 strv_free(m->sysvinit_path);
585 strv_free(m->sysvrcnd_path);
586 strv_free(m->environment);
588 free(m->cgroup_controller);
589 free(m->cgroup_hierarchy);
591 hashmap_free(m->cgroup_bondings);
596 int manager_enumerate(Manager *m) {
602 /* Let's ask every type to load all units from disk/kernel
603 * that it might know */
604 for (c = 0; c < _UNIT_TYPE_MAX; c++)
605 if (unit_vtable[c]->enumerate)
606 if ((q = unit_vtable[c]->enumerate(m)) < 0)
609 manager_dispatch_load_queue(m);
613 int manager_coldplug(Manager *m) {
621 /* Then, let's set up their initial state. */
622 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
628 if (UNIT_VTABLE(u)->coldplug)
629 if ((q = UNIT_VTABLE(u)->coldplug(u)) < 0)
636 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
641 /* First, enumerate what we can from all config files */
642 r = manager_enumerate(m);
644 /* Second, deserialize if there is something to deserialize */
646 if ((q = manager_deserialize(m, serialization, fds)) < 0)
649 /* Third, fire things up! */
650 if ((q = manager_coldplug(m)) < 0)
653 /* Now that the initial devices are available, let's see if we
654 * can write the utmp file */
655 manager_write_utmp_reboot(m);
660 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
664 /* Deletes one job from the transaction */
666 manager_transaction_unlink_job(m, j, delete_dependencies);
672 static void transaction_delete_unit(Manager *m, Unit *u) {
675 /* Deletes all jobs associated with a certain unit from the
678 while ((j = hashmap_get(m->transaction_jobs, u)))
679 transaction_delete_job(m, j, true);
682 static void transaction_clean_dependencies(Manager *m) {
688 /* Drops all dependencies of all installed jobs */
690 HASHMAP_FOREACH(j, m->jobs, i) {
691 while (j->subject_list)
692 job_dependency_free(j->subject_list);
693 while (j->object_list)
694 job_dependency_free(j->object_list);
697 assert(!m->transaction_anchor);
700 static void transaction_abort(Manager *m) {
705 while ((j = hashmap_first(m->transaction_jobs)))
707 transaction_delete_job(m, j, true);
711 assert(hashmap_isempty(m->transaction_jobs));
713 transaction_clean_dependencies(m);
716 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
721 /* A recursive sweep through the graph that marks all units
722 * that matter to the anchor job, i.e. are directly or
723 * indirectly a dependency of the anchor job via paths that
724 * are fully marked as mattering. */
729 l = m->transaction_anchor;
731 LIST_FOREACH(subject, l, l) {
733 /* This link does not matter */
737 /* This unit has already been marked */
738 if (l->object->generation == generation)
741 l->object->matters_to_anchor = true;
742 l->object->generation = generation;
744 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
748 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
749 JobDependency *l, *last;
753 assert(j->unit == other->unit);
754 assert(!j->installed);
756 /* Merges 'other' into 'j' and then deletes j. */
759 j->state = JOB_WAITING;
760 j->override = j->override || other->override;
762 j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
764 /* Patch us in as new owner of the JobDependency objects */
766 LIST_FOREACH(subject, l, other->subject_list) {
767 assert(l->subject == other);
772 /* Merge both lists */
774 last->subject_next = j->subject_list;
776 j->subject_list->subject_prev = last;
777 j->subject_list = other->subject_list;
780 /* Patch us in as new owner of the JobDependency objects */
782 LIST_FOREACH(object, l, other->object_list) {
783 assert(l->object == other);
788 /* Merge both lists */
790 last->object_next = j->object_list;
792 j->object_list->object_prev = last;
793 j->object_list = other->object_list;
796 /* Kill the other job */
797 other->subject_list = NULL;
798 other->object_list = NULL;
799 transaction_delete_job(m, other, true);
802 static int delete_one_unmergeable_job(Manager *m, Job *j) {
807 /* Tries to delete one item in the linked list
808 * j->transaction_next->transaction_next->... that conflicts
809 * whith another one, in an attempt to make an inconsistent
810 * transaction work. */
812 /* We rely here on the fact that if a merged with b does not
813 * merge with c, either a or b merge with c neither */
814 LIST_FOREACH(transaction, j, j)
815 LIST_FOREACH(transaction, k, j->transaction_next) {
818 /* Is this one mergeable? Then skip it */
819 if (job_type_is_mergeable(j->type, k->type))
822 /* Ok, we found two that conflict, let's see if we can
823 * drop one of them */
824 if (!j->matters_to_anchor)
826 else if (!k->matters_to_anchor)
831 /* Ok, we can drop one, so let's do so. */
832 log_debug("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
833 transaction_delete_job(m, d, true);
840 static int transaction_merge_jobs(Manager *m) {
847 /* First step, check whether any of the jobs for one specific
848 * task conflict. If so, try to drop one of them. */
849 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
854 LIST_FOREACH(transaction, k, j->transaction_next) {
855 if ((r = job_type_merge(&t, k->type)) >= 0)
858 /* OK, we could not merge all jobs for this
859 * action. Let's see if we can get rid of one
862 if ((r = delete_one_unmergeable_job(m, j)) >= 0)
863 /* Ok, we managed to drop one, now
864 * let's ask our callers to call us
865 * again after garbage collecting */
868 /* We couldn't merge anything. Failure */
873 /* Second step, merge the jobs. */
874 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
878 /* Merge all transactions */
879 LIST_FOREACH(transaction, k, j->transaction_next)
880 assert_se(job_type_merge(&t, k->type) == 0);
882 /* If an active job is mergeable, merge it too */
883 if (j->unit->meta.job)
884 job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
886 while ((k = j->transaction_next)) {
888 transaction_merge_and_delete_job(m, k, j, t);
891 transaction_merge_and_delete_job(m, j, k, t);
894 assert(!j->transaction_next);
895 assert(!j->transaction_prev);
901 static void transaction_drop_redundant(Manager *m) {
906 /* Goes through the transaction and removes all jobs that are
915 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
916 bool changes_something = false;
919 LIST_FOREACH(transaction, k, j) {
921 if (!job_is_anchor(k) &&
922 job_type_is_redundant(k->type, unit_active_state(k->unit)))
925 changes_something = true;
929 if (changes_something)
932 log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
933 transaction_delete_job(m, j, false);
941 static bool unit_matters_to_anchor(Unit *u, Job *j) {
943 assert(!j->transaction_prev);
945 /* Checks whether at least one of the jobs for this unit
946 * matters to the anchor. */
948 LIST_FOREACH(transaction, j, j)
949 if (j->matters_to_anchor)
955 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
962 assert(!j->transaction_prev);
964 /* Does a recursive sweep through the ordering graph, looking
965 * for a cycle. If we find cycle we try to break it. */
967 /* Did we find a cycle? */
968 if (j->marker && j->generation == generation) {
971 /* So, we already have been here. We have a
972 * cycle. Let's try to break it. We go backwards in
973 * our path and try to find a suitable job to
974 * remove. We use the marker to find our way back,
975 * since smart how we are we stored our way back in
978 log_debug("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
980 for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) {
982 log_debug("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
985 !unit_matters_to_anchor(k->unit, k)) {
986 /* Ok, we can drop this one, so let's
988 log_debug("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
989 transaction_delete_unit(m, k->unit);
993 /* Check if this in fact was the beginning of
999 log_debug("Unable to break cycle");
1004 /* Make the marker point to where we come from, so that we can
1005 * find our way backwards if we want to break a cycle */
1007 j->generation = generation;
1009 /* We assume that the the dependencies are bidirectional, and
1010 * hence can ignore UNIT_AFTER */
1011 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1014 /* Is there a job for this unit? */
1015 if (!(o = hashmap_get(m->transaction_jobs, u)))
1017 /* Ok, there is no job for this in the
1018 * transaction, but maybe there is already one
1020 if (!(o = u->meta.job))
1023 if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
1027 /* Ok, let's backtrack, and remember that this entry is not on
1028 * our path anymore. */
1034 static int transaction_verify_order(Manager *m, unsigned *generation) {
1042 /* Check if the ordering graph is cyclic. If it is, try to fix
1043 * that up by dropping one of the jobs. */
1045 HASHMAP_FOREACH(j, m->transaction_jobs, i)
1046 if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0)
1052 static void transaction_collect_garbage(Manager *m) {
1057 /* Drop jobs that are not required by any other job */
1065 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1069 log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
1070 transaction_delete_job(m, j, true);
1078 static int transaction_is_destructive(Manager *m) {
1084 /* Checks whether applying this transaction means that
1085 * existing jobs would be replaced */
1087 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1090 assert(!j->transaction_prev);
1091 assert(!j->transaction_next);
1093 if (j->unit->meta.job &&
1094 j->unit->meta.job != j &&
1095 !job_type_is_superset(j->type, j->unit->meta.job->type))
1102 static void transaction_minimize_impact(Manager *m) {
1106 /* Drops all unnecessary jobs that reverse already active jobs
1107 * or that stop a running service. */
1115 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1116 LIST_FOREACH(transaction, j, j) {
1117 bool stops_running_service, changes_existing_job;
1119 /* If it matters, we shouldn't drop it */
1120 if (j->matters_to_anchor)
1123 /* Would this stop a running service?
1124 * Would this change an existing job?
1125 * If so, let's drop this entry */
1127 stops_running_service =
1128 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1130 changes_existing_job =
1131 j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
1133 if (!stops_running_service && !changes_existing_job)
1136 if (stops_running_service)
1137 log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1139 if (changes_existing_job)
1140 log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1142 /* Ok, let's get rid of this */
1143 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1145 transaction_delete_job(m, j, true);
1157 static int transaction_apply(Manager *m) {
1162 /* Moves the transaction jobs to the set of active jobs */
1164 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1166 assert(!j->transaction_prev);
1167 assert(!j->transaction_next);
1172 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1176 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1180 if (j->unit->meta.job)
1181 job_free(j->unit->meta.job);
1183 j->unit->meta.job = j;
1184 j->installed = true;
1186 /* We're fully installed. Now let's free data we don't
1189 assert(!j->transaction_next);
1190 assert(!j->transaction_prev);
1192 job_add_to_run_queue(j);
1193 job_add_to_dbus_queue(j);
1196 /* As last step, kill all remaining job dependencies. */
1197 transaction_clean_dependencies(m);
1203 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1207 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1213 static int transaction_activate(Manager *m, JobMode mode) {
1215 unsigned generation = 1;
1219 /* This applies the changes recorded in transaction_jobs to
1220 * the actual list of jobs, if possible. */
1222 /* First step: figure out which jobs matter */
1223 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1225 /* Second step: Try not to stop any running services if
1226 * we don't have to. Don't try to reverse running
1227 * jobs if we don't have to. */
1228 transaction_minimize_impact(m);
1230 /* Third step: Drop redundant jobs */
1231 transaction_drop_redundant(m);
1234 /* Fourth step: Let's remove unneeded jobs that might
1236 transaction_collect_garbage(m);
1238 /* Fifth step: verify order makes sense and correct
1239 * cycles if necessary and possible */
1240 if ((r = transaction_verify_order(m, &generation)) >= 0)
1244 log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
1248 /* Let's see if the resulting transaction ordering
1249 * graph is still cyclic... */
1253 /* Sixth step: let's drop unmergeable entries if
1254 * necessary and possible, merge entries we can
1256 if ((r = transaction_merge_jobs(m)) >= 0)
1260 log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
1264 /* Seventh step: an entry got dropped, let's garbage
1265 * collect its dependencies. */
1266 transaction_collect_garbage(m);
1268 /* Let's see if the resulting transaction still has
1269 * unmergeable entries ... */
1272 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1273 transaction_drop_redundant(m);
1275 /* Ninth step: check whether we can actually apply this */
1276 if (mode == JOB_FAIL)
1277 if ((r = transaction_is_destructive(m)) < 0) {
1278 log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
1282 /* Tenth step: apply changes */
1283 if ((r = transaction_apply(m)) < 0) {
1284 log_debug("Failed to apply transaction: %s", strerror(-r));
1288 assert(hashmap_isempty(m->transaction_jobs));
1289 assert(!m->transaction_anchor);
1294 transaction_abort(m);
1298 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1305 /* Looks for an axisting prospective job and returns that. If
1306 * it doesn't exist it is created and added to the prospective
1309 f = hashmap_get(m->transaction_jobs, unit);
1311 LIST_FOREACH(transaction, j, f) {
1312 assert(j->unit == unit);
1314 if (j->type == type) {
1321 if (unit->meta.job && unit->meta.job->type == type)
1323 else if (!(j = job_new(m, type, unit)))
1328 j->matters_to_anchor = false;
1329 j->override = override;
1331 LIST_PREPEND(Job, transaction, f, j);
1333 if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1341 log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1346 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1350 if (j->transaction_prev)
1351 j->transaction_prev->transaction_next = j->transaction_next;
1352 else if (j->transaction_next)
1353 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1355 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1357 if (j->transaction_next)
1358 j->transaction_next->transaction_prev = j->transaction_prev;
1360 j->transaction_prev = j->transaction_next = NULL;
1362 while (j->subject_list)
1363 job_dependency_free(j->subject_list);
1365 while (j->object_list) {
1366 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1368 job_dependency_free(j->object_list);
1370 if (other && delete_dependencies) {
1371 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1372 other->unit->meta.id, job_type_to_string(other->type),
1373 j->unit->meta.id, job_type_to_string(j->type));
1374 transaction_delete_job(m, other, delete_dependencies);
1379 static int transaction_add_job_and_dependencies(
1394 assert(type < _JOB_TYPE_MAX);
1397 if (unit->meta.load_state != UNIT_LOADED)
1400 if (!unit_job_is_applicable(unit, type))
1403 /* First add the job. */
1404 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1407 /* Then, add a link to the job. */
1408 if (!job_dependency_new(by, ret, matters))
1412 /* Finally, recursively add in all dependencies. */
1413 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1414 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1415 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1418 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1419 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1420 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1422 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1423 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0)
1424 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1426 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1427 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1430 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1431 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1432 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1434 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1435 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1438 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1440 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1441 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1445 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1457 static int transaction_add_isolate_jobs(Manager *m) {
1465 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1467 /* ignore aliases */
1468 if (u->meta.id != k)
1471 if (UNIT_VTABLE(u)->no_isolate)
1474 /* No need to stop inactive jobs */
1475 if (unit_active_state(u) == UNIT_INACTIVE)
1478 /* Is there already something listed for this? */
1479 if (hashmap_get(m->transaction_jobs, u))
1482 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL)) < 0)
1483 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1489 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) {
1494 assert(type < _JOB_TYPE_MAX);
1496 assert(mode < _JOB_MODE_MAX);
1498 if (mode == JOB_ISOLATE && type != JOB_START)
1501 log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
1503 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) {
1504 transaction_abort(m);
1508 if (mode == JOB_ISOLATE)
1509 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1510 transaction_abort(m);
1514 if ((r = transaction_activate(m, mode)) < 0)
1517 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1525 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, Job **_ret) {
1530 assert(type < _JOB_TYPE_MAX);
1532 assert(mode < _JOB_MODE_MAX);
1534 if ((r = manager_load_unit(m, name, NULL, &unit)) < 0)
1537 return manager_add_job(m, type, unit, mode, override, _ret);
1540 Job *manager_get_job(Manager *m, uint32_t id) {
1543 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1546 Unit *manager_get_unit(Manager *m, const char *name) {
1550 return hashmap_get(m->units, name);
1553 unsigned manager_dispatch_load_queue(Manager *m) {
1559 /* Make sure we are not run recursively */
1560 if (m->dispatching_load_queue)
1563 m->dispatching_load_queue = true;
1565 /* Dispatches the load queue. Takes a unit from the queue and
1566 * tries to load its data until the queue is empty */
1568 while ((meta = m->load_queue)) {
1569 assert(meta->in_load_queue);
1571 unit_load(UNIT(meta));
1575 m->dispatching_load_queue = false;
1579 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) {
1584 assert(name || path);
1586 /* This will prepare the unit for loading, but not actually
1587 * load anything from disk. */
1589 if (path && !is_path(path))
1593 name = file_name_from_path(path);
1595 if (!unit_name_is_valid(name))
1598 if ((ret = manager_get_unit(m, name))) {
1603 if (!(ret = unit_new(m)))
1607 if (!(ret->meta.fragment_path = strdup(path))) {
1612 if ((r = unit_add_name(ret, name)) < 0) {
1617 unit_add_to_load_queue(ret);
1618 unit_add_to_dbus_queue(ret);
1619 unit_add_to_gc_queue(ret);
1627 int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) {
1632 /* This will load the service information files, but not actually
1633 * start any services or anything. */
1635 if ((r = manager_load_unit_prepare(m, name, path, _ret)) != 0)
1638 manager_dispatch_load_queue(m);
1641 *_ret = unit_follow_merge(*_ret);
1646 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1653 HASHMAP_FOREACH(j, s->jobs, i)
1654 job_dump(j, f, prefix);
1657 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1665 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1666 if (u->meta.id == t)
1667 unit_dump(u, f, prefix);
1670 void manager_clear_jobs(Manager *m) {
1675 transaction_abort(m);
1677 while ((j = hashmap_first(m->jobs)))
1681 unsigned manager_dispatch_run_queue(Manager *m) {
1685 if (m->dispatching_run_queue)
1688 m->dispatching_run_queue = true;
1690 while ((j = m->run_queue)) {
1691 assert(j->installed);
1692 assert(j->in_run_queue);
1694 job_run_and_invalidate(j);
1698 m->dispatching_run_queue = false;
1702 unsigned manager_dispatch_dbus_queue(Manager *m) {
1709 if (m->dispatching_dbus_queue)
1712 m->dispatching_dbus_queue = true;
1714 while ((meta = m->dbus_unit_queue)) {
1715 assert(meta->in_dbus_queue);
1717 bus_unit_send_change_signal(UNIT(meta));
1721 while ((j = m->dbus_job_queue)) {
1722 assert(j->in_dbus_queue);
1724 bus_job_send_change_signal(j);
1728 m->dispatching_dbus_queue = false;
1732 static int manager_dispatch_sigchld(Manager *m) {
1741 /* First we call waitd() for a PID and do not reap the
1742 * zombie. That way we can still access /proc/$PID for
1743 * it while it is a zombie. */
1744 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1746 if (errno == ECHILD)
1758 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1761 get_process_name(si.si_pid, &name);
1762 log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si.si_pid, strna(name));
1766 /* And now, we actually reap the zombie. */
1767 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1774 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1777 log_debug("Child %llu died (code=%s, status=%i/%s)",
1778 (long long unsigned) si.si_pid,
1779 sigchld_code_to_string(si.si_code),
1781 strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
1783 if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
1786 log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
1788 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1794 static void manager_start_target(Manager *m, const char *name) {
1797 if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_REPLACE, true, NULL)) < 0)
1798 log_error("Failed to enqueue %s job: %s", name, strerror(-r));
1801 static int manager_process_signal_fd(Manager *m) {
1803 struct signalfd_siginfo sfsi;
1804 bool sigchld = false;
1809 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1814 if (errno == EAGAIN)
1820 switch (sfsi.ssi_signo) {
1827 if (m->running_as == MANAGER_INIT)
1828 /* This is for compatibility with the
1829 * original sysvinit */
1830 m->exit_code = MANAGER_REEXECUTE;
1832 m->exit_code = MANAGER_EXIT;
1837 if (m->running_as == MANAGER_INIT) {
1838 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET);
1842 m->exit_code = MANAGER_EXIT;
1846 if (m->running_as == MANAGER_INIT)
1847 manager_start_target(m, SPECIAL_KBREQUEST_TARGET);
1849 /* This is a nop on non-init */
1853 if (m->running_as == MANAGER_INIT)
1854 manager_start_target(m, SPECIAL_SIGPWR_TARGET);
1856 /* This is a nop on non-init */
1862 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1864 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
1865 log_info("Trying to reconnect to bus...");
1870 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
1871 log_info("Loading D-Bus service...");
1872 manager_start_target(m, SPECIAL_DBUS_SERVICE);
1879 manager_dump_units(m, stdout, "\t");
1880 manager_dump_jobs(m, stdout, "\t");
1884 m->exit_code = MANAGER_RELOAD;
1888 log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
1893 return manager_dispatch_sigchld(m);
1898 static int process_event(Manager *m, struct epoll_event *ev) {
1905 assert(w = ev->data.ptr);
1911 /* An incoming signal? */
1912 if (ev->events != EPOLLIN)
1915 if ((r = manager_process_signal_fd(m)) < 0)
1922 /* Some fd event, to be dispatched to the units */
1923 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1930 /* Some timer event, to be dispatched to the units */
1931 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1933 if (k < 0 && (errno == EINTR || errno == EAGAIN))
1936 return k < 0 ? -errno : -EIO;
1939 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1944 /* Some mount table change, intended for the mount subsystem */
1945 mount_fd_event(m, ev->events);
1949 /* Some notification from udev, intended for the device subsystem */
1950 device_fd_event(m, ev->events);
1953 case WATCH_DBUS_WATCH:
1954 bus_watch_event(m, w, ev->events);
1957 case WATCH_DBUS_TIMEOUT:
1958 bus_timeout_event(m, w, ev->events);
1962 assert_not_reached("Unknown epoll event type.");
1968 int manager_loop(Manager *m) {
1971 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
1974 m->exit_code = MANAGER_RUNNING;
1976 /* There might still be some zombies hanging around from
1977 * before we were exec()'ed. Leat's reap them */
1978 if ((r = manager_dispatch_sigchld(m)) < 0)
1981 while (m->exit_code == MANAGER_RUNNING) {
1982 struct epoll_event event;
1985 if (!ratelimit_test(&rl)) {
1986 /* Yay, something is going seriously wrong, pause a little */
1987 log_warning("Looping too fast. Throttling execution a little.");
1991 if (manager_dispatch_load_queue(m) > 0)
1994 if (manager_dispatch_run_queue(m) > 0)
1997 if (bus_dispatch(m) > 0)
2000 if (manager_dispatch_cleanup_queue(m) > 0)
2003 if (manager_dispatch_gc_queue(m) > 0)
2006 if (manager_dispatch_dbus_queue(m) > 0)
2009 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2019 if ((r = process_event(m, &event)) < 0)
2023 return m->exit_code;
2026 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2034 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2037 if (!(n = bus_path_unescape(s+31)))
2040 u = manager_get_unit(m, n);
2051 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2060 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2063 if ((r = safe_atou(s + 30, &id)) < 0)
2066 if (!(j = manager_get_job(m, id)))
2074 static bool manager_utmp_good(Manager *m) {
2079 if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
2082 log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
2090 void manager_write_utmp_reboot(Manager *m) {
2095 if (m->utmp_reboot_written)
2098 if (m->running_as != MANAGER_INIT)
2101 if (!manager_utmp_good(m))
2104 if ((r = utmp_put_reboot(m->startup_timestamp.realtime)) < 0) {
2106 if (r != -ENOENT && r != -EROFS)
2107 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2112 m->utmp_reboot_written = true;
2115 void manager_write_utmp_runlevel(Manager *m, Unit *u) {
2121 if (u->meta.type != UNIT_TARGET)
2124 if (m->running_as != MANAGER_INIT)
2127 if (!manager_utmp_good(m))
2130 if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
2133 if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
2135 if (r != -ENOENT && r != -EROFS)
2136 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2140 void manager_dispatch_bus_name_owner_changed(
2143 const char* old_owner,
2144 const char *new_owner) {
2151 if (!(u = hashmap_get(m->watch_bus, name)))
2154 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2157 void manager_dispatch_bus_query_pid_done(
2168 if (!(u = hashmap_get(m->watch_bus, name)))
2171 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2174 int manager_open_serialization(FILE **_f) {
2182 if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2185 saved_umask = umask(0077);
2186 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2196 log_debug("Serializing state to %s", path);
2199 if (!(f = fdopen(fd, "w+")) < 0)
2207 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2217 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2218 if (u->meta.id != t)
2221 if (!unit_can_serialize(u))
2225 fputs(u->meta.id, f);
2228 if ((r = unit_serialize(u, f, fds)) < 0)
2238 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2244 log_debug("Deserializing state...");
2248 char name[UNIT_NAME_MAX+2];
2251 if (!fgets(name, sizeof(name), f)) {
2260 if ((r = manager_load_unit(m, strstrip(name), NULL, &u)) < 0)
2263 if ((r = unit_deserialize(u, f, fds)) < 0)
2273 int manager_reload(Manager *m) {
2280 if ((r = manager_open_serialization(&f)) < 0)
2283 if (!(fds = fdset_new())) {
2288 if ((r = manager_serialize(m, f, fds)) < 0)
2291 if (fseeko(f, 0, SEEK_SET) < 0) {
2296 /* From here on there is no way back. */
2297 manager_clear_jobs_and_units(m);
2299 /* First, enumerate what we can from all config files */
2300 if ((q = manager_enumerate(m)) < 0)
2303 /* Second, deserialize our stored data */
2304 if ((q = manager_deserialize(m, f, fds)) < 0)
2310 /* Third, fire things up! */
2311 if ((q = manager_coldplug(m)) < 0)
2324 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2325 [MANAGER_INIT] = "init",
2326 [MANAGER_SYSTEM] = "system",
2327 [MANAGER_SESSION] = "session"
2330 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);