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 manager_dispatch_cleanup_queue(m);
548 while ((j = hashmap_first(m->transaction_jobs)))
551 while ((u = hashmap_first(m->units)))
555 void manager_free(Manager *m) {
560 manager_clear_jobs_and_units(m);
562 for (c = 0; c < _UNIT_TYPE_MAX; c++)
563 if (unit_vtable[c]->shutdown)
564 unit_vtable[c]->shutdown(m);
566 /* If we reexecute ourselves, we keep the root cgroup
568 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
573 hashmap_free(m->units);
574 hashmap_free(m->jobs);
575 hashmap_free(m->transaction_jobs);
576 hashmap_free(m->watch_pids);
577 hashmap_free(m->watch_bus);
579 if (m->epoll_fd >= 0)
580 close_nointr_nofail(m->epoll_fd);
581 if (m->signal_watch.fd >= 0)
582 close_nointr_nofail(m->signal_watch.fd);
584 strv_free(m->unit_path);
585 strv_free(m->sysvinit_path);
586 strv_free(m->sysvrcnd_path);
587 strv_free(m->environment);
589 free(m->cgroup_controller);
590 free(m->cgroup_hierarchy);
592 hashmap_free(m->cgroup_bondings);
597 int manager_enumerate(Manager *m) {
603 /* Let's ask every type to load all units from disk/kernel
604 * that it might know */
605 for (c = 0; c < _UNIT_TYPE_MAX; c++)
606 if (unit_vtable[c]->enumerate)
607 if ((q = unit_vtable[c]->enumerate(m)) < 0)
610 manager_dispatch_load_queue(m);
614 int manager_coldplug(Manager *m) {
622 /* Then, let's set up their initial state. */
623 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
629 if ((q = unit_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 /* Have we seen this before? */
968 if (j->generation == generation) {
971 /* If the marker is NULL we have been here already and
972 * decided the job was loop-free from here. Hence
973 * shortcut things and return right-away. */
977 /* So, the marker is not NULL and we already have been
978 * here. We have a cycle. Let's try to break it. We go
979 * backwards in our path and try to find a suitable
980 * job to remove. We use the marker to find our way
981 * back, since smart how we are we stored our way back
983 log_debug("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
985 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
987 log_debug("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
990 !unit_matters_to_anchor(k->unit, k)) {
991 /* Ok, we can drop this one, so let's
993 log_debug("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
994 transaction_delete_unit(m, k->unit);
998 /* Check if this in fact was the beginning of
1004 log_debug("Unable to break cycle");
1009 /* Make the marker point to where we come from, so that we can
1010 * find our way backwards if we want to break a cycle. We use
1011 * a special marker for the beginning: we point to
1013 j->marker = from ? from : j;
1014 j->generation = generation;
1016 /* We assume that the the dependencies are bidirectional, and
1017 * hence can ignore UNIT_AFTER */
1018 SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1021 /* Is there a job for this unit? */
1022 if (!(o = hashmap_get(m->transaction_jobs, u)))
1024 /* Ok, there is no job for this in the
1025 * transaction, but maybe there is already one
1027 if (!(o = u->meta.job))
1030 if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
1034 /* Ok, let's backtrack, and remember that this entry is not on
1035 * our path anymore. */
1041 static int transaction_verify_order(Manager *m, unsigned *generation) {
1050 /* Check if the ordering graph is cyclic. If it is, try to fix
1051 * that up by dropping one of the jobs. */
1053 g = (*generation)++;
1055 HASHMAP_FOREACH(j, m->transaction_jobs, i)
1056 if ((r = transaction_verify_order_one(m, j, NULL, g)) < 0)
1062 static void transaction_collect_garbage(Manager *m) {
1067 /* Drop jobs that are not required by any other job */
1075 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1079 log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
1080 transaction_delete_job(m, j, true);
1088 static int transaction_is_destructive(Manager *m) {
1094 /* Checks whether applying this transaction means that
1095 * existing jobs would be replaced */
1097 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1100 assert(!j->transaction_prev);
1101 assert(!j->transaction_next);
1103 if (j->unit->meta.job &&
1104 j->unit->meta.job != j &&
1105 !job_type_is_superset(j->type, j->unit->meta.job->type))
1112 static void transaction_minimize_impact(Manager *m) {
1116 /* Drops all unnecessary jobs that reverse already active jobs
1117 * or that stop a running service. */
1125 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1126 LIST_FOREACH(transaction, j, j) {
1127 bool stops_running_service, changes_existing_job;
1129 /* If it matters, we shouldn't drop it */
1130 if (j->matters_to_anchor)
1133 /* Would this stop a running service?
1134 * Would this change an existing job?
1135 * If so, let's drop this entry */
1137 stops_running_service =
1138 j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1140 changes_existing_job =
1141 j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
1143 if (!stops_running_service && !changes_existing_job)
1146 if (stops_running_service)
1147 log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1149 if (changes_existing_job)
1150 log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1152 /* Ok, let's get rid of this */
1153 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1155 transaction_delete_job(m, j, true);
1167 static int transaction_apply(Manager *m) {
1172 /* Moves the transaction jobs to the set of active jobs */
1174 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1176 assert(!j->transaction_prev);
1177 assert(!j->transaction_next);
1182 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1186 while ((j = hashmap_steal_first(m->transaction_jobs))) {
1190 if (j->unit->meta.job)
1191 job_free(j->unit->meta.job);
1193 j->unit->meta.job = j;
1194 j->installed = true;
1196 /* We're fully installed. Now let's free data we don't
1199 assert(!j->transaction_next);
1200 assert(!j->transaction_prev);
1202 job_add_to_run_queue(j);
1203 job_add_to_dbus_queue(j);
1206 /* As last step, kill all remaining job dependencies. */
1207 transaction_clean_dependencies(m);
1213 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1217 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1223 static int transaction_activate(Manager *m, JobMode mode) {
1225 unsigned generation = 1;
1229 /* This applies the changes recorded in transaction_jobs to
1230 * the actual list of jobs, if possible. */
1232 /* First step: figure out which jobs matter */
1233 transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1235 /* Second step: Try not to stop any running services if
1236 * we don't have to. Don't try to reverse running
1237 * jobs if we don't have to. */
1238 transaction_minimize_impact(m);
1240 /* Third step: Drop redundant jobs */
1241 transaction_drop_redundant(m);
1244 /* Fourth step: Let's remove unneeded jobs that might
1246 transaction_collect_garbage(m);
1248 /* Fifth step: verify order makes sense and correct
1249 * cycles if necessary and possible */
1250 if ((r = transaction_verify_order(m, &generation)) >= 0)
1254 log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
1258 /* Let's see if the resulting transaction ordering
1259 * graph is still cyclic... */
1263 /* Sixth step: let's drop unmergeable entries if
1264 * necessary and possible, merge entries we can
1266 if ((r = transaction_merge_jobs(m)) >= 0)
1270 log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
1274 /* Seventh step: an entry got dropped, let's garbage
1275 * collect its dependencies. */
1276 transaction_collect_garbage(m);
1278 /* Let's see if the resulting transaction still has
1279 * unmergeable entries ... */
1282 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1283 transaction_drop_redundant(m);
1285 /* Ninth step: check whether we can actually apply this */
1286 if (mode == JOB_FAIL)
1287 if ((r = transaction_is_destructive(m)) < 0) {
1288 log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
1292 /* Tenth step: apply changes */
1293 if ((r = transaction_apply(m)) < 0) {
1294 log_debug("Failed to apply transaction: %s", strerror(-r));
1298 assert(hashmap_isempty(m->transaction_jobs));
1299 assert(!m->transaction_anchor);
1304 transaction_abort(m);
1308 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1315 /* Looks for an axisting prospective job and returns that. If
1316 * it doesn't exist it is created and added to the prospective
1319 f = hashmap_get(m->transaction_jobs, unit);
1321 LIST_FOREACH(transaction, j, f) {
1322 assert(j->unit == unit);
1324 if (j->type == type) {
1331 if (unit->meta.job && unit->meta.job->type == type)
1333 else if (!(j = job_new(m, type, unit)))
1338 j->matters_to_anchor = false;
1339 j->override = override;
1341 LIST_PREPEND(Job, transaction, f, j);
1343 if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1351 log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1356 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1360 if (j->transaction_prev)
1361 j->transaction_prev->transaction_next = j->transaction_next;
1362 else if (j->transaction_next)
1363 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1365 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1367 if (j->transaction_next)
1368 j->transaction_next->transaction_prev = j->transaction_prev;
1370 j->transaction_prev = j->transaction_next = NULL;
1372 while (j->subject_list)
1373 job_dependency_free(j->subject_list);
1375 while (j->object_list) {
1376 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1378 job_dependency_free(j->object_list);
1380 if (other && delete_dependencies) {
1381 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1382 other->unit->meta.id, job_type_to_string(other->type),
1383 j->unit->meta.id, job_type_to_string(j->type));
1384 transaction_delete_job(m, other, delete_dependencies);
1389 static int transaction_add_job_and_dependencies(
1404 assert(type < _JOB_TYPE_MAX);
1407 if (unit->meta.load_state != UNIT_LOADED)
1410 if (!unit_job_is_applicable(unit, type))
1413 /* First add the job. */
1414 if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1417 /* Then, add a link to the job. */
1418 if (!job_dependency_new(by, ret, matters))
1422 /* Finally, recursively add in all dependencies. */
1423 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1424 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1425 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1428 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1429 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1430 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1432 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1433 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0)
1434 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1436 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1437 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1440 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1441 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1442 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1444 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1445 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1448 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1450 SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1451 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1455 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1467 static int transaction_add_isolate_jobs(Manager *m) {
1475 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1477 /* ignore aliases */
1478 if (u->meta.id != k)
1481 if (UNIT_VTABLE(u)->no_isolate)
1484 /* No need to stop inactive jobs */
1485 if (unit_active_state(u) == UNIT_INACTIVE)
1488 /* Is there already something listed for this? */
1489 if (hashmap_get(m->transaction_jobs, u))
1492 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL)) < 0)
1493 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1499 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) {
1504 assert(type < _JOB_TYPE_MAX);
1506 assert(mode < _JOB_MODE_MAX);
1508 if (mode == JOB_ISOLATE && type != JOB_START)
1511 log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
1513 if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) {
1514 transaction_abort(m);
1518 if (mode == JOB_ISOLATE)
1519 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1520 transaction_abort(m);
1524 if ((r = transaction_activate(m, mode)) < 0)
1527 log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1535 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, Job **_ret) {
1540 assert(type < _JOB_TYPE_MAX);
1542 assert(mode < _JOB_MODE_MAX);
1544 if ((r = manager_load_unit(m, name, NULL, &unit)) < 0)
1547 return manager_add_job(m, type, unit, mode, override, _ret);
1550 Job *manager_get_job(Manager *m, uint32_t id) {
1553 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1556 Unit *manager_get_unit(Manager *m, const char *name) {
1560 return hashmap_get(m->units, name);
1563 unsigned manager_dispatch_load_queue(Manager *m) {
1569 /* Make sure we are not run recursively */
1570 if (m->dispatching_load_queue)
1573 m->dispatching_load_queue = true;
1575 /* Dispatches the load queue. Takes a unit from the queue and
1576 * tries to load its data until the queue is empty */
1578 while ((meta = m->load_queue)) {
1579 assert(meta->in_load_queue);
1581 unit_load(UNIT(meta));
1585 m->dispatching_load_queue = false;
1589 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) {
1594 assert(name || path);
1596 /* This will prepare the unit for loading, but not actually
1597 * load anything from disk. */
1599 if (path && !is_path(path))
1603 name = file_name_from_path(path);
1605 if (!unit_name_is_valid(name))
1608 if ((ret = manager_get_unit(m, name))) {
1613 if (!(ret = unit_new(m)))
1617 if (!(ret->meta.fragment_path = strdup(path))) {
1622 if ((r = unit_add_name(ret, name)) < 0) {
1627 unit_add_to_load_queue(ret);
1628 unit_add_to_dbus_queue(ret);
1629 unit_add_to_gc_queue(ret);
1637 int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) {
1642 /* This will load the service information files, but not actually
1643 * start any services or anything. */
1645 if ((r = manager_load_unit_prepare(m, name, path, _ret)) != 0)
1648 manager_dispatch_load_queue(m);
1651 *_ret = unit_follow_merge(*_ret);
1656 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1663 HASHMAP_FOREACH(j, s->jobs, i)
1664 job_dump(j, f, prefix);
1667 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1675 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1676 if (u->meta.id == t)
1677 unit_dump(u, f, prefix);
1680 void manager_clear_jobs(Manager *m) {
1685 transaction_abort(m);
1687 while ((j = hashmap_first(m->jobs)))
1691 unsigned manager_dispatch_run_queue(Manager *m) {
1695 if (m->dispatching_run_queue)
1698 m->dispatching_run_queue = true;
1700 while ((j = m->run_queue)) {
1701 assert(j->installed);
1702 assert(j->in_run_queue);
1704 job_run_and_invalidate(j);
1708 m->dispatching_run_queue = false;
1712 unsigned manager_dispatch_dbus_queue(Manager *m) {
1719 if (m->dispatching_dbus_queue)
1722 m->dispatching_dbus_queue = true;
1724 while ((meta = m->dbus_unit_queue)) {
1725 assert(meta->in_dbus_queue);
1727 bus_unit_send_change_signal(UNIT(meta));
1731 while ((j = m->dbus_job_queue)) {
1732 assert(j->in_dbus_queue);
1734 bus_job_send_change_signal(j);
1738 m->dispatching_dbus_queue = false;
1742 static int manager_dispatch_sigchld(Manager *m) {
1751 /* First we call waitd() for a PID and do not reap the
1752 * zombie. That way we can still access /proc/$PID for
1753 * it while it is a zombie. */
1754 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1756 if (errno == ECHILD)
1768 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1771 get_process_name(si.si_pid, &name);
1772 log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si.si_pid, strna(name));
1776 /* And now, we actually reap the zombie. */
1777 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1784 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1787 log_debug("Child %llu died (code=%s, status=%i/%s)",
1788 (long long unsigned) si.si_pid,
1789 sigchld_code_to_string(si.si_code),
1791 strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
1793 if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
1796 log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
1798 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1804 static int manager_start_target(Manager *m, const char *name) {
1807 if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_REPLACE, true, NULL)) < 0)
1808 log_error("Failed to enqueue %s job: %s", name, strerror(-r));
1813 static int manager_process_signal_fd(Manager *m) {
1815 struct signalfd_siginfo sfsi;
1816 bool sigchld = false;
1821 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1826 if (errno == EAGAIN)
1832 switch (sfsi.ssi_signo) {
1839 if (m->running_as == MANAGER_INIT) {
1840 /* This is for compatibility with the
1841 * original sysvinit */
1842 m->exit_code = MANAGER_REEXECUTE;
1849 if (m->running_as == MANAGER_INIT) {
1850 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET);
1854 /* Run the exit target if there is one, if not, just exit. */
1855 if (manager_start_target(m, SPECIAL_EXIT_SERVICE) < 0) {
1856 m->exit_code = MANAGER_EXIT;
1863 if (m->running_as == MANAGER_INIT)
1864 manager_start_target(m, SPECIAL_KBREQUEST_TARGET);
1866 /* This is a nop on non-init */
1870 if (m->running_as == MANAGER_INIT)
1871 manager_start_target(m, SPECIAL_SIGPWR_TARGET);
1873 /* This is a nop on non-init */
1879 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1881 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
1882 log_info("Trying to reconnect to bus...");
1887 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
1888 log_info("Loading D-Bus service...");
1889 manager_start_target(m, SPECIAL_DBUS_SERVICE);
1900 if (!(f = open_memstream(&dump, &size))) {
1901 log_warning("Failed to allocate memory stream.");
1905 manager_dump_units(m, f, "\t");
1906 manager_dump_jobs(m, f, "\t");
1911 log_warning("Failed to write status stream");
1916 log_dump(LOG_INFO, dump);
1923 m->exit_code = MANAGER_RELOAD;
1927 log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
1932 return manager_dispatch_sigchld(m);
1937 static int process_event(Manager *m, struct epoll_event *ev) {
1944 assert(w = ev->data.ptr);
1950 /* An incoming signal? */
1951 if (ev->events != EPOLLIN)
1954 if ((r = manager_process_signal_fd(m)) < 0)
1961 /* Some fd event, to be dispatched to the units */
1962 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1969 /* Some timer event, to be dispatched to the units */
1970 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1972 if (k < 0 && (errno == EINTR || errno == EAGAIN))
1975 return k < 0 ? -errno : -EIO;
1978 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1983 /* Some mount table change, intended for the mount subsystem */
1984 mount_fd_event(m, ev->events);
1988 /* Some notification from udev, intended for the device subsystem */
1989 device_fd_event(m, ev->events);
1992 case WATCH_DBUS_WATCH:
1993 bus_watch_event(m, w, ev->events);
1996 case WATCH_DBUS_TIMEOUT:
1997 bus_timeout_event(m, w, ev->events);
2001 assert_not_reached("Unknown epoll event type.");
2007 int manager_loop(Manager *m) {
2010 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
2013 m->exit_code = MANAGER_RUNNING;
2015 /* There might still be some zombies hanging around from
2016 * before we were exec()'ed. Leat's reap them */
2017 if ((r = manager_dispatch_sigchld(m)) < 0)
2020 while (m->exit_code == MANAGER_RUNNING) {
2021 struct epoll_event event;
2024 if (!ratelimit_test(&rl)) {
2025 /* Yay, something is going seriously wrong, pause a little */
2026 log_warning("Looping too fast. Throttling execution a little.");
2030 if (manager_dispatch_load_queue(m) > 0)
2033 if (manager_dispatch_run_queue(m) > 0)
2036 if (bus_dispatch(m) > 0)
2039 if (manager_dispatch_cleanup_queue(m) > 0)
2042 if (manager_dispatch_gc_queue(m) > 0)
2045 if (manager_dispatch_dbus_queue(m) > 0)
2048 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2058 if ((r = process_event(m, &event)) < 0)
2062 return m->exit_code;
2065 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2073 if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2076 if (!(n = bus_path_unescape(s+31)))
2079 u = manager_get_unit(m, n);
2090 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2099 if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2102 if ((r = safe_atou(s + 30, &id)) < 0)
2105 if (!(j = manager_get_job(m, id)))
2113 static bool manager_utmp_good(Manager *m) {
2118 if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
2121 log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
2129 void manager_write_utmp_reboot(Manager *m) {
2134 if (m->utmp_reboot_written)
2137 if (m->running_as != MANAGER_INIT)
2140 if (!manager_utmp_good(m))
2143 if ((r = utmp_put_reboot(m->startup_timestamp.realtime)) < 0) {
2145 if (r != -ENOENT && r != -EROFS)
2146 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2151 m->utmp_reboot_written = true;
2154 void manager_write_utmp_runlevel(Manager *m, Unit *u) {
2160 if (u->meta.type != UNIT_TARGET)
2163 if (m->running_as != MANAGER_INIT)
2166 if (!manager_utmp_good(m))
2169 if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
2172 if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
2174 if (r != -ENOENT && r != -EROFS)
2175 log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2179 void manager_dispatch_bus_name_owner_changed(
2182 const char* old_owner,
2183 const char *new_owner) {
2190 if (!(u = hashmap_get(m->watch_bus, name)))
2193 UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2196 void manager_dispatch_bus_query_pid_done(
2207 if (!(u = hashmap_get(m->watch_bus, name)))
2210 UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2213 int manager_open_serialization(FILE **_f) {
2221 if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2224 saved_umask = umask(0077);
2225 fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2235 log_debug("Serializing state to %s", path);
2238 if (!(f = fdopen(fd, "w+")) < 0)
2246 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2256 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2257 if (u->meta.id != t)
2260 if (!unit_can_serialize(u))
2264 fputs(u->meta.id, f);
2267 if ((r = unit_serialize(u, f, fds)) < 0)
2277 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2283 log_debug("Deserializing state...");
2287 char name[UNIT_NAME_MAX+2];
2290 if (!fgets(name, sizeof(name), f)) {
2299 if ((r = manager_load_unit(m, strstrip(name), NULL, &u)) < 0)
2302 if ((r = unit_deserialize(u, f, fds)) < 0)
2312 int manager_reload(Manager *m) {
2319 if ((r = manager_open_serialization(&f)) < 0)
2322 if (!(fds = fdset_new())) {
2327 if ((r = manager_serialize(m, f, fds)) < 0)
2330 if (fseeko(f, 0, SEEK_SET) < 0) {
2335 /* From here on there is no way back. */
2336 manager_clear_jobs_and_units(m);
2338 /* First, enumerate what we can from all config files */
2339 if ((q = manager_enumerate(m)) < 0)
2342 /* Second, deserialize our stored data */
2343 if ((q = manager_deserialize(m, f, fds)) < 0)
2349 /* Third, fire things up! */
2350 if ((q = manager_coldplug(m)) < 0)
2363 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2364 [MANAGER_INIT] = "init",
2365 [MANAGER_SYSTEM] = "system",
2366 [MANAGER_SESSION] = "session"
2369 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);