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 (5*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
)) < 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 config_dirs
= strv_split(e
, ":");
154 config_dirs
= strv_new("/etc/xdg", NULL
);
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)
168 if ((e
= getenv("XDG_DATA_DIRS")))
169 data_dirs
= strv_split(e
, ":");
171 data_dirs
= strv_new("/usr/local/share", "/usr/share", NULL
);
176 /* Now merge everything we found. */
178 if (!(t
= strv_append(r
, config_home
)))
184 if (!(t
= strv_merge_concat(r
, config_dirs
, "/systemd/session")))
189 if (!(t
= strv_append(r
, SESSION_CONFIG_UNIT_PATH
)))
195 if (!(t
= strv_append(r
, data_home
)))
201 if (!(t
= strv_merge_concat(r
, data_dirs
, "/systemd/session")))
206 if (!(t
= strv_append(r
, SESSION_DATA_UNIT_PATH
)))
211 if (!strv_path_make_absolute_cwd(r
))
216 strv_free(config_dirs
);
218 strv_free(data_dirs
);
228 static int manager_find_paths(Manager
*m
) {
234 /* First priority is whatever has been passed to us via env
236 if ((e
= getenv("SYSTEMD_UNIT_PATH")))
237 if (!(m
->unit_path
= split_path_and_make_absolute(e
)))
240 if (strv_isempty(m
->unit_path
)) {
242 /* Nothing is set, so let's figure something out. */
243 strv_free(m
->unit_path
);
245 if (m
->running_as
== MANAGER_SESSION
) {
246 if (!(m
->unit_path
= session_dirs()))
249 if (!(m
->unit_path
= strv_new(
250 SYSTEM_CONFIG_UNIT_PATH
, /* /etc/systemd/system/ */
251 SYSTEM_DATA_UNIT_PATH
, /* /lib/systemd/system/ */
256 if (m
->running_as
== MANAGER_INIT
) {
257 /* /etc/init.d/ compativility does not matter to users */
259 if ((e
= getenv("SYSTEMD_SYSVINIT_PATH")))
260 if (!(m
->sysvinit_path
= split_path_and_make_absolute(e
)))
263 if (strv_isempty(m
->sysvinit_path
)) {
264 strv_free(m
->sysvinit_path
);
266 if (!(m
->sysvinit_path
= strv_new(
267 SYSTEM_SYSVINIT_PATH
, /* /etc/init.d/ */
272 if ((e
= getenv("SYSTEMD_SYSVRCND_PATH")))
273 if (!(m
->sysvrcnd_path
= split_path_and_make_absolute(e
)))
276 if (strv_isempty(m
->sysvrcnd_path
)) {
277 strv_free(m
->sysvrcnd_path
);
279 if (!(m
->sysvrcnd_path
= strv_new(
280 SYSTEM_SYSVRCND_PATH
, /* /etc/rcN.d/ */
286 strv_uniq(m
->unit_path
);
287 strv_uniq(m
->sysvinit_path
);
288 strv_uniq(m
->sysvrcnd_path
);
290 assert(!strv_isempty(m
->unit_path
));
291 if (!(t
= strv_join(m
->unit_path
, "\n\t")))
293 log_debug("Looking for unit files in:\n\t%s", t
);
296 if (!strv_isempty(m
->sysvinit_path
)) {
298 if (!(t
= strv_join(m
->sysvinit_path
, "\n\t")))
301 log_debug("Looking for SysV init scripts in:\n\t%s", t
);
304 log_debug("Ignoring SysV init scripts.");
306 if (!strv_isempty(m
->sysvrcnd_path
)) {
308 if (!(t
= strv_join(m
->sysvrcnd_path
, "\n\t")))
311 log_debug("Looking for SysV rcN.d links in:\n\t%s", t
);
314 log_debug("Ignoring SysV rcN.d links.");
319 int manager_new(ManagerRunningAs running_as
, bool confirm_spawn
, Manager
**_m
) {
324 assert(running_as
>= 0);
325 assert(running_as
< _MANAGER_RUNNING_AS_MAX
);
327 if (!(m
= new0(Manager
, 1)))
330 m
->boot_timestamp
= now(CLOCK_REALTIME
);
332 m
->running_as
= running_as
;
333 m
->confirm_spawn
= confirm_spawn
;
334 m
->name_data_slot
= -1;
335 m
->exit_code
= _MANAGER_EXIT_CODE_INVALID
;
337 m
->signal_watch
.fd
= m
->mount_watch
.fd
= m
->udev_watch
.fd
= m
->epoll_fd
= m
->dev_autofs_fd
= -1;
338 m
->current_job_id
= 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
340 if (!(m
->environment
= strv_copy(environ
)))
343 if (!(m
->units
= hashmap_new(string_hash_func
, string_compare_func
)))
346 if (!(m
->jobs
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
349 if (!(m
->transaction_jobs
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
352 if (!(m
->watch_pids
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
355 if (!(m
->cgroup_bondings
= hashmap_new(string_hash_func
, string_compare_func
)))
358 if (!(m
->watch_bus
= hashmap_new(string_hash_func
, string_compare_func
)))
361 if ((m
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
)) < 0)
364 if ((r
= manager_find_paths(m
)) < 0)
367 if ((r
= manager_setup_signals(m
)) < 0)
370 if ((r
= manager_setup_cgroup(m
)) < 0)
373 /* Try to connect to the busses, if possible. */
374 if ((r
= bus_init_system(m
)) < 0 ||
375 (r
= bus_init_api(m
)) < 0)
386 static unsigned manager_dispatch_cleanup_queue(Manager
*m
) {
392 while ((meta
= m
->cleanup_queue
)) {
393 assert(meta
->in_cleanup_queue
);
395 unit_free(UNIT(meta
));
403 GC_OFFSET_IN_PATH
, /* This one is on the path we were travelling */
404 GC_OFFSET_UNSURE
, /* No clue */
405 GC_OFFSET_GOOD
, /* We still need this unit */
406 GC_OFFSET_BAD
, /* We don't need this unit anymore */
410 static void unit_gc_sweep(Unit
*u
, unsigned gc_marker
) {
417 if (u
->meta
.gc_marker
== gc_marker
+ GC_OFFSET_GOOD
||
418 u
->meta
.gc_marker
== gc_marker
+ GC_OFFSET_BAD
||
419 u
->meta
.gc_marker
== gc_marker
+ GC_OFFSET_IN_PATH
)
422 if (u
->meta
.in_cleanup_queue
)
425 if (unit_check_gc(u
))
428 u
->meta
.gc_marker
= gc_marker
+ GC_OFFSET_IN_PATH
;
432 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REFERENCED_BY
], i
) {
433 unit_gc_sweep(other
, gc_marker
);
435 if (other
->meta
.gc_marker
== gc_marker
+ GC_OFFSET_GOOD
)
438 if (other
->meta
.gc_marker
!= gc_marker
+ GC_OFFSET_BAD
)
445 /* We were unable to find anything out about this entry, so
446 * let's investigate it later */
447 u
->meta
.gc_marker
= gc_marker
+ GC_OFFSET_UNSURE
;
448 unit_add_to_gc_queue(u
);
452 /* We definitely know that this one is not useful anymore, so
453 * let's mark it for deletion */
454 u
->meta
.gc_marker
= gc_marker
+ GC_OFFSET_BAD
;
455 unit_add_to_cleanup_queue(u
);
459 u
->meta
.gc_marker
= gc_marker
+ GC_OFFSET_GOOD
;
462 static unsigned manager_dispatch_gc_queue(Manager
*m
) {
469 if ((m
->n_in_gc_queue
< GC_QUEUE_ENTRIES_MAX
) &&
470 (m
->gc_queue_timestamp
<= 0 ||
471 (m
->gc_queue_timestamp
+ GC_QUEUE_USEC_MAX
) > now(CLOCK_MONOTONIC
)))
474 log_debug("Running GC...");
476 m
->gc_marker
+= _GC_OFFSET_MAX
;
477 if (m
->gc_marker
+ _GC_OFFSET_MAX
<= _GC_OFFSET_MAX
)
480 gc_marker
= m
->gc_marker
;
482 while ((meta
= m
->gc_queue
)) {
483 assert(meta
->in_gc_queue
);
485 unit_gc_sweep(UNIT(meta
), gc_marker
);
487 LIST_REMOVE(Meta
, gc_queue
, m
->gc_queue
, meta
);
488 meta
->in_gc_queue
= false;
492 if (meta
->gc_marker
== gc_marker
+ GC_OFFSET_BAD
||
493 meta
->gc_marker
== gc_marker
+ GC_OFFSET_UNSURE
) {
494 log_debug("Collecting %s", meta
->id
);
495 meta
->gc_marker
= gc_marker
+ GC_OFFSET_BAD
;
496 unit_add_to_cleanup_queue(UNIT(meta
));
500 m
->n_in_gc_queue
= 0;
501 m
->gc_queue_timestamp
= 0;
506 static void manager_clear_jobs_and_units(Manager
*m
) {
512 while ((j
= hashmap_first(m
->transaction_jobs
)))
515 while ((u
= hashmap_first(m
->units
)))
519 void manager_free(Manager
*m
) {
524 manager_clear_jobs_and_units(m
);
526 for (c
= 0; c
< _UNIT_TYPE_MAX
; c
++)
527 if (unit_vtable
[c
]->shutdown
)
528 unit_vtable
[c
]->shutdown(m
);
530 /* If we reexecute ourselves, we keep the root cgroup
532 manager_shutdown_cgroup(m
, m
->exit_code
!= MANAGER_REEXECUTE
);
537 hashmap_free(m
->units
);
538 hashmap_free(m
->jobs
);
539 hashmap_free(m
->transaction_jobs
);
540 hashmap_free(m
->watch_pids
);
541 hashmap_free(m
->watch_bus
);
543 if (m
->epoll_fd
>= 0)
544 close_nointr_nofail(m
->epoll_fd
);
545 if (m
->signal_watch
.fd
>= 0)
546 close_nointr_nofail(m
->signal_watch
.fd
);
548 strv_free(m
->unit_path
);
549 strv_free(m
->sysvinit_path
);
550 strv_free(m
->sysvrcnd_path
);
551 strv_free(m
->environment
);
553 free(m
->cgroup_controller
);
554 free(m
->cgroup_hierarchy
);
556 hashmap_free(m
->cgroup_bondings
);
561 int manager_enumerate(Manager
*m
) {
567 /* Let's ask every type to load all units from disk/kernel
568 * that it might know */
569 for (c
= 0; c
< _UNIT_TYPE_MAX
; c
++)
570 if (unit_vtable
[c
]->enumerate
)
571 if ((q
= unit_vtable
[c
]->enumerate(m
)) < 0)
574 manager_dispatch_load_queue(m
);
578 int manager_coldplug(Manager
*m
) {
586 /* Then, let's set up their initial state. */
587 HASHMAP_FOREACH_KEY(u
, k
, m
->units
, i
) {
593 if (UNIT_VTABLE(u
)->coldplug
)
594 if ((q
= UNIT_VTABLE(u
)->coldplug(u
)) < 0)
601 int manager_startup(Manager
*m
, FILE *serialization
, FDSet
*fds
) {
606 /* First, enumerate what we can from all config files */
607 r
= manager_enumerate(m
);
609 /* Second, deserialize if there is something to deserialize */
611 if ((q
= manager_deserialize(m
, serialization
, fds
)) < 0)
614 /* Third, fire things up! */
615 if ((q
= manager_coldplug(m
)) < 0)
618 /* Now that the initial devices are available, let's see if we
619 * can write the utmp file */
620 manager_write_utmp_reboot(m
);
625 static void transaction_delete_job(Manager
*m
, Job
*j
, bool delete_dependencies
) {
629 /* Deletes one job from the transaction */
631 manager_transaction_unlink_job(m
, j
, delete_dependencies
);
637 static void transaction_delete_unit(Manager
*m
, Unit
*u
) {
640 /* Deletes all jobs associated with a certain unit from the
643 while ((j
= hashmap_get(m
->transaction_jobs
, u
)))
644 transaction_delete_job(m
, j
, true);
647 static void transaction_clean_dependencies(Manager
*m
) {
653 /* Drops all dependencies of all installed jobs */
655 HASHMAP_FOREACH(j
, m
->jobs
, i
) {
656 while (j
->subject_list
)
657 job_dependency_free(j
->subject_list
);
658 while (j
->object_list
)
659 job_dependency_free(j
->object_list
);
662 assert(!m
->transaction_anchor
);
665 static void transaction_abort(Manager
*m
) {
670 while ((j
= hashmap_first(m
->transaction_jobs
)))
672 transaction_delete_job(m
, j
, true);
676 assert(hashmap_isempty(m
->transaction_jobs
));
678 transaction_clean_dependencies(m
);
681 static void transaction_find_jobs_that_matter_to_anchor(Manager
*m
, Job
*j
, unsigned generation
) {
686 /* A recursive sweep through the graph that marks all units
687 * that matter to the anchor job, i.e. are directly or
688 * indirectly a dependency of the anchor job via paths that
689 * are fully marked as mattering. */
694 l
= m
->transaction_anchor
;
696 LIST_FOREACH(subject
, l
, l
) {
698 /* This link does not matter */
702 /* This unit has already been marked */
703 if (l
->object
->generation
== generation
)
706 l
->object
->matters_to_anchor
= true;
707 l
->object
->generation
= generation
;
709 transaction_find_jobs_that_matter_to_anchor(m
, l
->object
, generation
);
713 static void transaction_merge_and_delete_job(Manager
*m
, Job
*j
, Job
*other
, JobType t
) {
714 JobDependency
*l
, *last
;
718 assert(j
->unit
== other
->unit
);
719 assert(!j
->installed
);
721 /* Merges 'other' into 'j' and then deletes j. */
724 j
->state
= JOB_WAITING
;
725 j
->override
= j
->override
|| other
->override
;
727 j
->matters_to_anchor
= j
->matters_to_anchor
|| other
->matters_to_anchor
;
729 /* Patch us in as new owner of the JobDependency objects */
731 LIST_FOREACH(subject
, l
, other
->subject_list
) {
732 assert(l
->subject
== other
);
737 /* Merge both lists */
739 last
->subject_next
= j
->subject_list
;
741 j
->subject_list
->subject_prev
= last
;
742 j
->subject_list
= other
->subject_list
;
745 /* Patch us in as new owner of the JobDependency objects */
747 LIST_FOREACH(object
, l
, other
->object_list
) {
748 assert(l
->object
== other
);
753 /* Merge both lists */
755 last
->object_next
= j
->object_list
;
757 j
->object_list
->object_prev
= last
;
758 j
->object_list
= other
->object_list
;
761 /* Kill the other job */
762 other
->subject_list
= NULL
;
763 other
->object_list
= NULL
;
764 transaction_delete_job(m
, other
, true);
767 static int delete_one_unmergeable_job(Manager
*m
, Job
*j
) {
772 /* Tries to delete one item in the linked list
773 * j->transaction_next->transaction_next->... that conflicts
774 * whith another one, in an attempt to make an inconsistent
775 * transaction work. */
777 /* We rely here on the fact that if a merged with b does not
778 * merge with c, either a or b merge with c neither */
779 LIST_FOREACH(transaction
, j
, j
)
780 LIST_FOREACH(transaction
, k
, j
->transaction_next
) {
783 /* Is this one mergeable? Then skip it */
784 if (job_type_is_mergeable(j
->type
, k
->type
))
787 /* Ok, we found two that conflict, let's see if we can
788 * drop one of them */
789 if (!j
->matters_to_anchor
)
791 else if (!k
->matters_to_anchor
)
796 /* Ok, we can drop one, so let's do so. */
797 log_debug("Trying to fix job merging by deleting job %s/%s", d
->unit
->meta
.id
, job_type_to_string(d
->type
));
798 transaction_delete_job(m
, d
, true);
805 static int transaction_merge_jobs(Manager
*m
) {
812 /* First step, check whether any of the jobs for one specific
813 * task conflict. If so, try to drop one of them. */
814 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
819 LIST_FOREACH(transaction
, k
, j
->transaction_next
) {
820 if ((r
= job_type_merge(&t
, k
->type
)) >= 0)
823 /* OK, we could not merge all jobs for this
824 * action. Let's see if we can get rid of one
827 if ((r
= delete_one_unmergeable_job(m
, j
)) >= 0)
828 /* Ok, we managed to drop one, now
829 * let's ask our callers to call us
830 * again after garbage collecting */
833 /* We couldn't merge anything. Failure */
838 /* Second step, merge the jobs. */
839 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
843 /* Merge all transactions */
844 LIST_FOREACH(transaction
, k
, j
->transaction_next
)
845 assert_se(job_type_merge(&t
, k
->type
) == 0);
847 /* If an active job is mergeable, merge it too */
848 if (j
->unit
->meta
.job
)
849 job_type_merge(&t
, j
->unit
->meta
.job
->type
); /* Might fail. Which is OK */
851 while ((k
= j
->transaction_next
)) {
853 transaction_merge_and_delete_job(m
, k
, j
, t
);
856 transaction_merge_and_delete_job(m
, j
, k
, t
);
859 assert(!j
->transaction_next
);
860 assert(!j
->transaction_prev
);
866 static void transaction_drop_redundant(Manager
*m
) {
871 /* Goes through the transaction and removes all jobs that are
880 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
881 bool changes_something
= false;
884 LIST_FOREACH(transaction
, k
, j
) {
886 if (!job_is_anchor(k
) &&
887 job_type_is_redundant(k
->type
, unit_active_state(k
->unit
)))
890 changes_something
= true;
894 if (changes_something
)
897 log_debug("Found redundant job %s/%s, dropping.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
898 transaction_delete_job(m
, j
, false);
906 static bool unit_matters_to_anchor(Unit
*u
, Job
*j
) {
908 assert(!j
->transaction_prev
);
910 /* Checks whether at least one of the jobs for this unit
911 * matters to the anchor. */
913 LIST_FOREACH(transaction
, j
, j
)
914 if (j
->matters_to_anchor
)
920 static int transaction_verify_order_one(Manager
*m
, Job
*j
, Job
*from
, unsigned generation
) {
927 assert(!j
->transaction_prev
);
929 /* Does a recursive sweep through the ordering graph, looking
930 * for a cycle. If we find cycle we try to break it. */
932 /* Did we find a cycle? */
933 if (j
->marker
&& j
->generation
== generation
) {
936 /* So, we already have been here. We have a
937 * cycle. Let's try to break it. We go backwards in
938 * our path and try to find a suitable job to
939 * remove. We use the marker to find our way back,
940 * since smart how we are we stored our way back in
943 log_debug("Found ordering cycle on %s/%s", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
945 for (k
= from
; k
; k
= (k
->generation
== generation
? k
->marker
: NULL
)) {
947 log_debug("Walked on cycle path to %s/%s", k
->unit
->meta
.id
, job_type_to_string(k
->type
));
950 !unit_matters_to_anchor(k
->unit
, k
)) {
951 /* Ok, we can drop this one, so let's
953 log_debug("Breaking order cycle by deleting job %s/%s", k
->unit
->meta
.id
, job_type_to_string(k
->type
));
954 transaction_delete_unit(m
, k
->unit
);
958 /* Check if this in fact was the beginning of
964 log_debug("Unable to break cycle");
969 /* Make the marker point to where we come from, so that we can
970 * find our way backwards if we want to break a cycle */
972 j
->generation
= generation
;
974 /* We assume that the the dependencies are bidirectional, and
975 * hence can ignore UNIT_AFTER */
976 SET_FOREACH(u
, j
->unit
->meta
.dependencies
[UNIT_BEFORE
], i
) {
979 /* Is there a job for this unit? */
980 if (!(o
= hashmap_get(m
->transaction_jobs
, u
)))
982 /* Ok, there is no job for this in the
983 * transaction, but maybe there is already one
985 if (!(o
= u
->meta
.job
))
988 if ((r
= transaction_verify_order_one(m
, o
, j
, generation
)) < 0)
992 /* Ok, let's backtrack, and remember that this entry is not on
993 * our path anymore. */
999 static int transaction_verify_order(Manager
*m
, unsigned *generation
) {
1007 /* Check if the ordering graph is cyclic. If it is, try to fix
1008 * that up by dropping one of the jobs. */
1010 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
)
1011 if ((r
= transaction_verify_order_one(m
, j
, NULL
, (*generation
)++)) < 0)
1017 static void transaction_collect_garbage(Manager
*m
) {
1022 /* Drop jobs that are not required by any other job */
1030 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1034 log_debug("Garbage collecting job %s/%s", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1035 transaction_delete_job(m
, j
, true);
1043 static int transaction_is_destructive(Manager
*m
) {
1049 /* Checks whether applying this transaction means that
1050 * existing jobs would be replaced */
1052 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1055 assert(!j
->transaction_prev
);
1056 assert(!j
->transaction_next
);
1058 if (j
->unit
->meta
.job
&&
1059 j
->unit
->meta
.job
!= j
&&
1060 !job_type_is_superset(j
->type
, j
->unit
->meta
.job
->type
))
1067 static void transaction_minimize_impact(Manager
*m
) {
1071 /* Drops all unnecessary jobs that reverse already active jobs
1072 * or that stop a running service. */
1080 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1081 LIST_FOREACH(transaction
, j
, j
) {
1082 bool stops_running_service
, changes_existing_job
;
1084 /* If it matters, we shouldn't drop it */
1085 if (j
->matters_to_anchor
)
1088 /* Would this stop a running service?
1089 * Would this change an existing job?
1090 * If so, let's drop this entry */
1092 stops_running_service
=
1093 j
->type
== JOB_STOP
&& UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j
->unit
));
1095 changes_existing_job
=
1096 j
->unit
->meta
.job
&& job_type_is_conflicting(j
->type
, j
->unit
->meta
.job
->state
);
1098 if (!stops_running_service
&& !changes_existing_job
)
1101 if (stops_running_service
)
1102 log_debug("%s/%s would stop a running service.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1104 if (changes_existing_job
)
1105 log_debug("%s/%s would change existing job.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1107 /* Ok, let's get rid of this */
1108 log_debug("Deleting %s/%s to minimize impact.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1110 transaction_delete_job(m
, j
, true);
1122 static int transaction_apply(Manager
*m
) {
1127 /* Moves the transaction jobs to the set of active jobs */
1129 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1131 assert(!j
->transaction_prev
);
1132 assert(!j
->transaction_next
);
1137 if ((r
= hashmap_put(m
->jobs
, UINT32_TO_PTR(j
->id
), j
)) < 0)
1141 while ((j
= hashmap_steal_first(m
->transaction_jobs
))) {
1145 if (j
->unit
->meta
.job
)
1146 job_free(j
->unit
->meta
.job
);
1148 j
->unit
->meta
.job
= j
;
1149 j
->installed
= true;
1151 /* We're fully installed. Now let's free data we don't
1154 assert(!j
->transaction_next
);
1155 assert(!j
->transaction_prev
);
1157 job_add_to_run_queue(j
);
1158 job_add_to_dbus_queue(j
);
1161 /* As last step, kill all remaining job dependencies. */
1162 transaction_clean_dependencies(m
);
1168 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1172 hashmap_remove(m
->jobs
, UINT32_TO_PTR(j
->id
));
1178 static int transaction_activate(Manager
*m
, JobMode mode
) {
1180 unsigned generation
= 1;
1184 /* This applies the changes recorded in transaction_jobs to
1185 * the actual list of jobs, if possible. */
1187 /* First step: figure out which jobs matter */
1188 transaction_find_jobs_that_matter_to_anchor(m
, NULL
, generation
++);
1190 /* Second step: Try not to stop any running services if
1191 * we don't have to. Don't try to reverse running
1192 * jobs if we don't have to. */
1193 transaction_minimize_impact(m
);
1195 /* Third step: Drop redundant jobs */
1196 transaction_drop_redundant(m
);
1199 /* Fourth step: Let's remove unneeded jobs that might
1201 transaction_collect_garbage(m
);
1203 /* Fifth step: verify order makes sense and correct
1204 * cycles if necessary and possible */
1205 if ((r
= transaction_verify_order(m
, &generation
)) >= 0)
1209 log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r
));
1213 /* Let's see if the resulting transaction ordering
1214 * graph is still cyclic... */
1218 /* Sixth step: let's drop unmergeable entries if
1219 * necessary and possible, merge entries we can
1221 if ((r
= transaction_merge_jobs(m
)) >= 0)
1225 log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r
));
1229 /* Seventh step: an entry got dropped, let's garbage
1230 * collect its dependencies. */
1231 transaction_collect_garbage(m
);
1233 /* Let's see if the resulting transaction still has
1234 * unmergeable entries ... */
1237 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1238 transaction_drop_redundant(m
);
1240 /* Ninth step: check whether we can actually apply this */
1241 if (mode
== JOB_FAIL
)
1242 if ((r
= transaction_is_destructive(m
)) < 0) {
1243 log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r
));
1247 /* Tenth step: apply changes */
1248 if ((r
= transaction_apply(m
)) < 0) {
1249 log_debug("Failed to apply transaction: %s", strerror(-r
));
1253 assert(hashmap_isempty(m
->transaction_jobs
));
1254 assert(!m
->transaction_anchor
);
1259 transaction_abort(m
);
1263 static Job
* transaction_add_one_job(Manager
*m
, JobType type
, Unit
*unit
, bool override
, bool *is_new
) {
1270 /* Looks for an axisting prospective job and returns that. If
1271 * it doesn't exist it is created and added to the prospective
1274 f
= hashmap_get(m
->transaction_jobs
, unit
);
1276 LIST_FOREACH(transaction
, j
, f
) {
1277 assert(j
->unit
== unit
);
1279 if (j
->type
== type
) {
1286 if (unit
->meta
.job
&& unit
->meta
.job
->type
== type
)
1288 else if (!(j
= job_new(m
, type
, unit
)))
1293 j
->matters_to_anchor
= false;
1294 j
->override
= override
;
1296 LIST_PREPEND(Job
, transaction
, f
, j
);
1298 if ((r
= hashmap_replace(m
->transaction_jobs
, unit
, f
)) < 0) {
1306 log_debug("Added job %s/%s to transaction.", unit
->meta
.id
, job_type_to_string(type
));
1311 void manager_transaction_unlink_job(Manager
*m
, Job
*j
, bool delete_dependencies
) {
1315 if (j
->transaction_prev
)
1316 j
->transaction_prev
->transaction_next
= j
->transaction_next
;
1317 else if (j
->transaction_next
)
1318 hashmap_replace(m
->transaction_jobs
, j
->unit
, j
->transaction_next
);
1320 hashmap_remove_value(m
->transaction_jobs
, j
->unit
, j
);
1322 if (j
->transaction_next
)
1323 j
->transaction_next
->transaction_prev
= j
->transaction_prev
;
1325 j
->transaction_prev
= j
->transaction_next
= NULL
;
1327 while (j
->subject_list
)
1328 job_dependency_free(j
->subject_list
);
1330 while (j
->object_list
) {
1331 Job
*other
= j
->object_list
->matters
? j
->object_list
->subject
: NULL
;
1333 job_dependency_free(j
->object_list
);
1335 if (other
&& delete_dependencies
) {
1336 log_debug("Deleting job %s/%s as dependency of job %s/%s",
1337 other
->unit
->meta
.id
, job_type_to_string(other
->type
),
1338 j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1339 transaction_delete_job(m
, other
, delete_dependencies
);
1344 static int transaction_add_job_and_dependencies(
1359 assert(type
< _JOB_TYPE_MAX
);
1362 if (unit
->meta
.load_state
!= UNIT_LOADED
)
1365 if (!unit_job_is_applicable(unit
, type
))
1368 /* First add the job. */
1369 if (!(ret
= transaction_add_one_job(m
, type
, unit
, override
, &is_new
)))
1372 /* Then, add a link to the job. */
1373 if (!job_dependency_new(by
, ret
, matters
))
1377 /* Finally, recursively add in all dependencies. */
1378 if (type
== JOB_START
|| type
== JOB_RELOAD_OR_START
) {
1379 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRES
], i
)
1380 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, true, override
, NULL
)) < 0 && r
!= -EBADR
)
1383 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
1384 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, !override
, override
, NULL
)) < 0 && r
!= -EBADR
)
1385 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, strerror(-r
));
1387 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_WANTS
], i
)
1388 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, false, false, NULL
)) < 0)
1389 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, strerror(-r
));
1391 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUISITE
], i
)
1392 if ((r
= transaction_add_job_and_dependencies(m
, JOB_VERIFY_ACTIVE
, dep
, ret
, true, override
, NULL
)) < 0 && r
!= -EBADR
)
1395 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUISITE_OVERRIDABLE
], i
)
1396 if ((r
= transaction_add_job_and_dependencies(m
, JOB_VERIFY_ACTIVE
, dep
, ret
, !override
, override
, NULL
)) < 0 && r
!= -EBADR
)
1397 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, strerror(-r
));
1399 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
1400 if ((r
= transaction_add_job_and_dependencies(m
, JOB_STOP
, dep
, ret
, true, override
, NULL
)) < 0 && r
!= -EBADR
)
1403 } else if (type
== JOB_STOP
|| type
== JOB_RESTART
|| type
== JOB_TRY_RESTART
) {
1405 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
1406 if ((r
= transaction_add_job_and_dependencies(m
, type
, dep
, ret
, true, override
, NULL
)) < 0 && r
!= -EBADR
)
1410 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1422 static int transaction_add_isolate_jobs(Manager
*m
) {
1430 HASHMAP_FOREACH_KEY(u
, k
, m
->units
, i
) {
1432 /* ignore aliases */
1433 if (u
->meta
.id
!= k
)
1436 if (UNIT_VTABLE(u
)->no_isolate
)
1439 /* No need to stop inactive jobs */
1440 if (unit_active_state(u
) == UNIT_INACTIVE
)
1443 /* Is there already something listed for this? */
1444 if (hashmap_get(m
->transaction_jobs
, u
))
1447 if ((r
= transaction_add_job_and_dependencies(m
, JOB_STOP
, u
, NULL
, true, false, NULL
)) < 0)
1448 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u
->meta
.id
, strerror(-r
));
1454 int manager_add_job(Manager
*m
, JobType type
, Unit
*unit
, JobMode mode
, bool override
, Job
**_ret
) {
1459 assert(type
< _JOB_TYPE_MAX
);
1461 assert(mode
< _JOB_MODE_MAX
);
1463 if (mode
== JOB_ISOLATE
&& type
!= JOB_START
)
1466 log_debug("Trying to enqueue job %s/%s", unit
->meta
.id
, job_type_to_string(type
));
1468 if ((r
= transaction_add_job_and_dependencies(m
, type
, unit
, NULL
, true, override
, &ret
)) < 0) {
1469 transaction_abort(m
);
1473 if (mode
== JOB_ISOLATE
)
1474 if ((r
= transaction_add_isolate_jobs(m
)) < 0) {
1475 transaction_abort(m
);
1479 if ((r
= transaction_activate(m
, mode
)) < 0)
1482 log_debug("Enqueued job %s/%s as %u", unit
->meta
.id
, job_type_to_string(type
), (unsigned) ret
->id
);
1490 int manager_add_job_by_name(Manager
*m
, JobType type
, const char *name
, JobMode mode
, bool override
, Job
**_ret
) {
1495 assert(type
< _JOB_TYPE_MAX
);
1497 assert(mode
< _JOB_MODE_MAX
);
1499 if ((r
= manager_load_unit(m
, name
, NULL
, &unit
)) < 0)
1502 return manager_add_job(m
, type
, unit
, mode
, override
, _ret
);
1505 Job
*manager_get_job(Manager
*m
, uint32_t id
) {
1508 return hashmap_get(m
->jobs
, UINT32_TO_PTR(id
));
1511 Unit
*manager_get_unit(Manager
*m
, const char *name
) {
1515 return hashmap_get(m
->units
, name
);
1518 unsigned manager_dispatch_load_queue(Manager
*m
) {
1524 /* Make sure we are not run recursively */
1525 if (m
->dispatching_load_queue
)
1528 m
->dispatching_load_queue
= true;
1530 /* Dispatches the load queue. Takes a unit from the queue and
1531 * tries to load its data until the queue is empty */
1533 while ((meta
= m
->load_queue
)) {
1534 assert(meta
->in_load_queue
);
1536 unit_load(UNIT(meta
));
1540 m
->dispatching_load_queue
= false;
1544 int manager_load_unit_prepare(Manager
*m
, const char *name
, const char *path
, Unit
**_ret
) {
1549 assert(name
|| path
);
1551 /* This will prepare the unit for loading, but not actually
1552 * load anything from disk. */
1554 if (path
&& !is_path(path
))
1558 name
= file_name_from_path(path
);
1560 if (!unit_name_is_valid(name
))
1563 if ((ret
= manager_get_unit(m
, name
))) {
1568 if (!(ret
= unit_new(m
)))
1572 if (!(ret
->meta
.fragment_path
= strdup(path
))) {
1577 if ((r
= unit_add_name(ret
, name
)) < 0) {
1582 unit_add_to_load_queue(ret
);
1583 unit_add_to_dbus_queue(ret
);
1591 int manager_load_unit(Manager
*m
, const char *name
, const char *path
, Unit
**_ret
) {
1597 /* This will load the service information files, but not actually
1598 * start any services or anything. */
1600 if ((r
= manager_load_unit_prepare(m
, name
, path
, &ret
)) < 0)
1603 manager_dispatch_load_queue(m
);
1606 *_ret
= unit_follow_merge(ret
);
1611 void manager_dump_jobs(Manager
*s
, FILE *f
, const char *prefix
) {
1618 HASHMAP_FOREACH(j
, s
->jobs
, i
)
1619 job_dump(j
, f
, prefix
);
1622 void manager_dump_units(Manager
*s
, FILE *f
, const char *prefix
) {
1630 HASHMAP_FOREACH_KEY(u
, t
, s
->units
, i
)
1631 if (u
->meta
.id
== t
)
1632 unit_dump(u
, f
, prefix
);
1635 void manager_clear_jobs(Manager
*m
) {
1640 transaction_abort(m
);
1642 while ((j
= hashmap_first(m
->jobs
)))
1646 unsigned manager_dispatch_run_queue(Manager
*m
) {
1650 if (m
->dispatching_run_queue
)
1653 m
->dispatching_run_queue
= true;
1655 while ((j
= m
->run_queue
)) {
1656 assert(j
->installed
);
1657 assert(j
->in_run_queue
);
1659 job_run_and_invalidate(j
);
1663 m
->dispatching_run_queue
= false;
1667 unsigned manager_dispatch_dbus_queue(Manager
*m
) {
1674 if (m
->dispatching_dbus_queue
)
1677 m
->dispatching_dbus_queue
= true;
1679 while ((meta
= m
->dbus_unit_queue
)) {
1680 assert(meta
->in_dbus_queue
);
1682 bus_unit_send_change_signal(UNIT(meta
));
1686 while ((j
= m
->dbus_job_queue
)) {
1687 assert(j
->in_dbus_queue
);
1689 bus_job_send_change_signal(j
);
1693 m
->dispatching_dbus_queue
= false;
1697 static int manager_dispatch_sigchld(Manager
*m
) {
1706 /* First we call waitd() for a PID and do not reap the
1707 * zombie. That way we can still access /proc/$PID for
1708 * it while it is a zombie. */
1709 if (waitid(P_ALL
, 0, &si
, WEXITED
|WNOHANG
|WNOWAIT
) < 0) {
1711 if (errno
== ECHILD
)
1723 if (si
.si_code
== CLD_EXITED
|| si
.si_code
== CLD_KILLED
|| si
.si_code
== CLD_DUMPED
) {
1726 get_process_name(si
.si_pid
, &name
);
1727 log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si
.si_pid
, strna(name
));
1731 /* And now, we actually reap the zombie. */
1732 if (waitid(P_PID
, si
.si_pid
, &si
, WEXITED
) < 0) {
1739 if (si
.si_code
!= CLD_EXITED
&& si
.si_code
!= CLD_KILLED
&& si
.si_code
!= CLD_DUMPED
)
1742 log_debug("Child %llu died (code=%s, status=%i/%s)",
1743 (long long unsigned) si
.si_pid
,
1744 sigchld_code_to_string(si
.si_code
),
1746 strna(si
.si_code
== CLD_EXITED
? exit_status_to_string(si
.si_status
) : strsignal(si
.si_status
)));
1748 if (!(u
= hashmap_remove(m
->watch_pids
, UINT32_TO_PTR(si
.si_pid
))))
1751 log_debug("Child %llu belongs to %s", (long long unsigned) si
.si_pid
, u
->meta
.id
);
1753 UNIT_VTABLE(u
)->sigchld_event(u
, si
.si_pid
, si
.si_code
, si
.si_status
);
1759 static void manager_start_target(Manager
*m
, const char *name
) {
1762 if ((r
= manager_add_job_by_name(m
, JOB_START
, name
, JOB_REPLACE
, true, NULL
)) < 0)
1763 log_error("Failed to enqueue %s job: %s", name
, strerror(-r
));
1766 static int manager_process_signal_fd(Manager
*m
) {
1768 struct signalfd_siginfo sfsi
;
1769 bool sigchld
= false;
1774 if ((n
= read(m
->signal_watch
.fd
, &sfsi
, sizeof(sfsi
))) != sizeof(sfsi
)) {
1779 if (errno
== EAGAIN
)
1785 switch (sfsi
.ssi_signo
) {
1792 if (m
->running_as
== MANAGER_INIT
)
1793 /* This is for compatibility with the
1794 * original sysvinit */
1795 m
->exit_code
= MANAGER_REEXECUTE
;
1797 m
->exit_code
= MANAGER_EXIT
;
1802 if (m
->running_as
== MANAGER_INIT
) {
1803 manager_start_target(m
, SPECIAL_CTRL_ALT_DEL_TARGET
);
1807 m
->exit_code
= MANAGER_EXIT
;
1811 if (m
->running_as
== MANAGER_INIT
)
1812 manager_start_target(m
, SPECIAL_KBREQUEST_TARGET
);
1814 /* This is a nop on non-init */
1818 if (m
->running_as
== MANAGER_INIT
)
1819 manager_start_target(m
, SPECIAL_SIGPWR_TARGET
);
1821 /* This is a nop on non-init */
1827 u
= manager_get_unit(m
, SPECIAL_DBUS_SERVICE
);
1829 if (!u
|| UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
))) {
1830 log_info("Trying to reconnect to bus...");
1835 if (!u
|| !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
))) {
1836 log_info("Loading D-Bus service...");
1837 manager_start_target(m
, SPECIAL_DBUS_SERVICE
);
1844 manager_dump_units(m
, stdout
, "\t");
1845 manager_dump_jobs(m
, stdout
, "\t");
1849 m
->exit_code
= MANAGER_RELOAD
;
1853 log_info("Got unhandled signal <%s>.", strsignal(sfsi
.ssi_signo
));
1858 return manager_dispatch_sigchld(m
);
1863 static int process_event(Manager
*m
, struct epoll_event
*ev
) {
1870 assert(w
= ev
->data
.ptr
);
1876 /* An incoming signal? */
1877 if (ev
->events
!= EPOLLIN
)
1880 if ((r
= manager_process_signal_fd(m
)) < 0)
1887 /* Some fd event, to be dispatched to the units */
1888 UNIT_VTABLE(w
->data
.unit
)->fd_event(w
->data
.unit
, w
->fd
, ev
->events
, w
);
1895 /* Some timer event, to be dispatched to the units */
1896 if ((k
= read(w
->fd
, &v
, sizeof(v
))) != sizeof(v
)) {
1898 if (k
< 0 && (errno
== EINTR
|| errno
== EAGAIN
))
1901 return k
< 0 ? -errno
: -EIO
;
1904 UNIT_VTABLE(w
->data
.unit
)->timer_event(w
->data
.unit
, v
, w
);
1909 /* Some mount table change, intended for the mount subsystem */
1910 mount_fd_event(m
, ev
->events
);
1914 /* Some notification from udev, intended for the device subsystem */
1915 device_fd_event(m
, ev
->events
);
1918 case WATCH_DBUS_WATCH
:
1919 bus_watch_event(m
, w
, ev
->events
);
1922 case WATCH_DBUS_TIMEOUT
:
1923 bus_timeout_event(m
, w
, ev
->events
);
1927 assert_not_reached("Unknown epoll event type.");
1933 int manager_loop(Manager
*m
) {
1936 RATELIMIT_DEFINE(rl
, 1*USEC_PER_SEC
, 1000);
1939 m
->exit_code
= MANAGER_RUNNING
;
1941 while (m
->exit_code
== MANAGER_RUNNING
) {
1942 struct epoll_event event
;
1945 if (!ratelimit_test(&rl
)) {
1946 /* Yay, something is going seriously wrong, pause a little */
1947 log_warning("Looping too fast. Throttling execution a little.");
1951 if (manager_dispatch_cleanup_queue(m
) > 0)
1954 if (manager_dispatch_gc_queue(m
) > 0)
1957 if (manager_dispatch_load_queue(m
) > 0)
1960 if (manager_dispatch_run_queue(m
) > 0)
1963 if (bus_dispatch(m
) > 0)
1966 if (manager_dispatch_dbus_queue(m
) > 0)
1969 if ((n
= epoll_wait(m
->epoll_fd
, &event
, 1, -1)) < 0) {
1979 if ((r
= process_event(m
, &event
)) < 0)
1983 return m
->exit_code
;
1986 int manager_get_unit_from_dbus_path(Manager
*m
, const char *s
, Unit
**_u
) {
1994 if (!startswith(s
, "/org/freedesktop/systemd1/unit/"))
1997 if (!(n
= bus_path_unescape(s
+31)))
2000 u
= manager_get_unit(m
, n
);
2011 int manager_get_job_from_dbus_path(Manager
*m
, const char *s
, Job
**_j
) {
2020 if (!startswith(s
, "/org/freedesktop/systemd1/job/"))
2023 if ((r
= safe_atou(s
+ 30, &id
)) < 0)
2026 if (!(j
= manager_get_job(m
, id
)))
2034 static bool manager_utmp_good(Manager
*m
) {
2039 if ((r
= mount_path_is_mounted(m
, _PATH_UTMPX
)) <= 0) {
2042 log_warning("Failed to determine whether " _PATH_UTMPX
" is mounted: %s", strerror(-r
));
2050 void manager_write_utmp_reboot(Manager
*m
) {
2055 if (m
->utmp_reboot_written
)
2058 if (m
->running_as
!= MANAGER_INIT
)
2061 if (!manager_utmp_good(m
))
2064 if ((r
= utmp_put_reboot(m
->boot_timestamp
)) < 0) {
2066 if (r
!= -ENOENT
&& r
!= -EROFS
)
2067 log_warning("Failed to write utmp/wtmp: %s", strerror(-r
));
2072 m
->utmp_reboot_written
= true;
2075 void manager_write_utmp_runlevel(Manager
*m
, Unit
*u
) {
2081 if (u
->meta
.type
!= UNIT_TARGET
)
2084 if (m
->running_as
!= MANAGER_INIT
)
2087 if (!manager_utmp_good(m
))
2090 if ((runlevel
= target_get_runlevel(TARGET(u
))) <= 0)
2093 if ((r
= utmp_put_runlevel(0, runlevel
, 0)) < 0) {
2095 if (r
!= -ENOENT
&& r
!= -EROFS
)
2096 log_warning("Failed to write utmp/wtmp: %s", strerror(-r
));
2100 void manager_dispatch_bus_name_owner_changed(
2103 const char* old_owner
,
2104 const char *new_owner
) {
2111 if (!(u
= hashmap_get(m
->watch_bus
, name
)))
2114 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
2117 void manager_dispatch_bus_query_pid_done(
2128 if (!(u
= hashmap_get(m
->watch_bus
, name
)))
2131 UNIT_VTABLE(u
)->bus_query_pid_done(u
, name
, pid
);
2134 int manager_open_serialization(FILE **_f
) {
2142 if (asprintf(&path
, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2145 saved_umask
= umask(0077);
2146 fd
= mkostemp(path
, O_RDWR
|O_CLOEXEC
);
2156 log_debug("Serializing state to %s", path
);
2159 if (!(f
= fdopen(fd
, "w+")) < 0)
2167 int manager_serialize(Manager
*m
, FILE *f
, FDSet
*fds
) {
2177 HASHMAP_FOREACH_KEY(u
, t
, m
->units
, i
) {
2178 if (u
->meta
.id
!= t
)
2181 if (!unit_can_serialize(u
))
2185 fputs(u
->meta
.id
, f
);
2188 if ((r
= unit_serialize(u
, f
, fds
)) < 0)
2198 int manager_deserialize(Manager
*m
, FILE *f
, FDSet
*fds
) {
2204 log_debug("Deserializing state...");
2208 char name
[UNIT_NAME_MAX
+2];
2211 if (!fgets(name
, sizeof(name
), f
)) {
2220 if ((r
= manager_load_unit(m
, strstrip(name
), NULL
, &u
)) < 0)
2223 if ((r
= unit_deserialize(u
, f
, fds
)) < 0)
2233 int manager_reload(Manager
*m
) {
2240 if ((r
= manager_open_serialization(&f
)) < 0)
2243 if (!(fds
= fdset_new())) {
2248 if ((r
= manager_serialize(m
, f
, fds
)) < 0)
2251 if (fseeko(f
, 0, SEEK_SET
) < 0) {
2256 /* From here on there is no way back. */
2257 manager_clear_jobs_and_units(m
);
2259 /* First, enumerate what we can from all config files */
2260 if ((q
= manager_enumerate(m
)) < 0)
2263 /* Second, deserialize our stored data */
2264 if ((q
= manager_deserialize(m
, f
, fds
)) < 0)
2270 /* Third, fire things up! */
2271 if ((q
= manager_coldplug(m
)) < 0)
2284 static const char* const manager_running_as_table
[_MANAGER_RUNNING_AS_MAX
] = {
2285 [MANAGER_INIT
] = "init",
2286 [MANAGER_SYSTEM
] = "system",
2287 [MANAGER_SESSION
] = "session"
2290 DEFINE_STRING_TABLE_LOOKUP(manager_running_as
, ManagerRunningAs
);