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>
37 #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"
55 #include "path-lookup.h"
57 #include "bus-errors.h"
59 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
60 #define GC_QUEUE_ENTRIES_MAX 16
62 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
63 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
65 /* Where clients shall send notification messages to */
66 #define NOTIFY_SOCKET "/org/freedesktop/systemd1/notify"
68 static int manager_setup_notify(Manager
*m
) {
71 struct sockaddr_un un
;
73 struct epoll_event ev
;
78 m
->notify_watch
.type
= WATCH_NOTIFY
;
79 if ((m
->notify_watch
.fd
= socket(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
|SOCK_NONBLOCK
, 0)) < 0) {
80 log_error("Failed to allocate notification socket: %m");
85 sa
.sa
.sa_family
= AF_UNIX
;
88 snprintf(sa
.un
.sun_path
+1, sizeof(sa
.un
.sun_path
)-1, NOTIFY_SOCKET
"/%llu", random_ull());
90 strncpy(sa
.un
.sun_path
+1, NOTIFY_SOCKET
, sizeof(sa
.un
.sun_path
)-1);
92 if (bind(m
->notify_watch
.fd
, &sa
.sa
, sizeof(sa_family_t
) + 1 + strlen(sa
.un
.sun_path
+1)) < 0) {
93 log_error("bind() failed: %m");
97 if (setsockopt(m
->notify_watch
.fd
, SOL_SOCKET
, SO_PASSCRED
, &one
, sizeof(one
)) < 0) {
98 log_error("SO_PASSCRED failed: %m");
104 ev
.data
.ptr
= &m
->notify_watch
;
106 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, m
->notify_watch
.fd
, &ev
) < 0)
109 if (!(m
->notify_socket
= strdup(sa
.un
.sun_path
+1)))
115 static int enable_special_signals(Manager
*m
) {
120 /* Enable that we get SIGINT on control-alt-del */
121 if (reboot(RB_DISABLE_CAD
) < 0)
122 log_warning("Failed to enable ctrl-alt-del handling: %m");
124 if ((fd
= open_terminal("/dev/tty0", O_RDWR
|O_NOCTTY
)) < 0)
125 log_warning("Failed to open /dev/tty0: %m");
127 /* Enable that we get SIGWINCH on kbrequest */
128 if (ioctl(fd
, KDSIGACCEPT
, SIGWINCH
) < 0)
129 log_warning("Failed to enable kbrequest handling: %s", strerror(errno
));
131 close_nointr_nofail(fd
);
137 static int manager_setup_signals(Manager
*m
) {
139 struct epoll_event ev
;
144 /* We are not interested in SIGSTOP and friends. */
146 sa
.sa_handler
= SIG_DFL
;
147 sa
.sa_flags
= SA_NOCLDSTOP
|SA_RESTART
;
148 assert_se(sigaction(SIGCHLD
, &sa
, NULL
) == 0);
150 assert_se(sigemptyset(&mask
) == 0);
152 sigset_add_many(&mask
,
153 SIGCHLD
, /* Child died */
154 SIGTERM
, /* Reexecute daemon */
155 SIGHUP
, /* Reload configuration */
156 SIGUSR1
, /* systemd/upstart: reconnect to D-Bus */
157 SIGUSR2
, /* systemd: dump status */
158 SIGINT
, /* Kernel sends us this on control-alt-del */
159 SIGWINCH
, /* Kernel sends us this on kbrequest (alt-arrowup) */
160 SIGPWR
, /* Some kernel drivers and upsd send us this on power failure */
161 SIGRTMIN
+0, /* systemd: start default.target */
162 SIGRTMIN
+1, /* systemd: start rescue.target */
163 SIGRTMIN
+2, /* systemd: isolate emergency.target */
164 SIGRTMIN
+3, /* systemd: start halt.target */
165 SIGRTMIN
+4, /* systemd: start poweroff.target */
166 SIGRTMIN
+5, /* systemd: start reboot.target */
168 assert_se(sigprocmask(SIG_SETMASK
, &mask
, NULL
) == 0);
170 m
->signal_watch
.type
= WATCH_SIGNAL
;
171 if ((m
->signal_watch
.fd
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
)) < 0)
176 ev
.data
.ptr
= &m
->signal_watch
;
178 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, m
->signal_watch
.fd
, &ev
) < 0)
181 if (m
->running_as
== MANAGER_SYSTEM
)
182 return enable_special_signals(m
);
187 int manager_new(ManagerRunningAs running_as
, Manager
**_m
) {
192 assert(running_as
>= 0);
193 assert(running_as
< _MANAGER_RUNNING_AS_MAX
);
195 if (!(m
= new0(Manager
, 1)))
198 dual_timestamp_get(&m
->startup_timestamp
);
200 m
->running_as
= running_as
;
201 m
->name_data_slot
= m
->subscribed_data_slot
= -1;
202 m
->exit_code
= _MANAGER_EXIT_CODE_INVALID
;
203 m
->pin_cgroupfs_fd
= -1;
205 m
->signal_watch
.fd
= m
->mount_watch
.fd
= m
->udev_watch
.fd
= m
->epoll_fd
= m
->dev_autofs_fd
= -1;
206 m
->current_job_id
= 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
208 if (!(m
->environment
= strv_copy(environ
)))
211 if (!(m
->units
= hashmap_new(string_hash_func
, string_compare_func
)))
214 if (!(m
->jobs
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
217 if (!(m
->transaction_jobs
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
220 if (!(m
->watch_pids
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
223 if (!(m
->cgroup_bondings
= hashmap_new(string_hash_func
, string_compare_func
)))
226 if (!(m
->watch_bus
= hashmap_new(string_hash_func
, string_compare_func
)))
229 if ((m
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
)) < 0)
232 if ((r
= lookup_paths_init(&m
->lookup_paths
, m
->running_as
)) < 0)
235 if ((r
= manager_setup_signals(m
)) < 0)
238 if ((r
= manager_setup_cgroup(m
)) < 0)
241 if ((r
= manager_setup_notify(m
)) < 0)
244 /* Try to connect to the busses, if possible. */
245 if ((r
= bus_init(m
)) < 0)
256 static unsigned manager_dispatch_cleanup_queue(Manager
*m
) {
262 while ((meta
= m
->cleanup_queue
)) {
263 assert(meta
->in_cleanup_queue
);
265 unit_free((Unit
*) meta
);
273 GC_OFFSET_IN_PATH
, /* This one is on the path we were travelling */
274 GC_OFFSET_UNSURE
, /* No clue */
275 GC_OFFSET_GOOD
, /* We still need this unit */
276 GC_OFFSET_BAD
, /* We don't need this unit anymore */
280 static void unit_gc_sweep(Unit
*u
, unsigned gc_marker
) {
287 if (u
->meta
.gc_marker
== gc_marker
+ GC_OFFSET_GOOD
||
288 u
->meta
.gc_marker
== gc_marker
+ GC_OFFSET_BAD
||
289 u
->meta
.gc_marker
== gc_marker
+ GC_OFFSET_IN_PATH
)
292 if (u
->meta
.in_cleanup_queue
)
295 if (unit_check_gc(u
))
298 u
->meta
.gc_marker
= gc_marker
+ GC_OFFSET_IN_PATH
;
302 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REFERENCED_BY
], i
) {
303 unit_gc_sweep(other
, gc_marker
);
305 if (other
->meta
.gc_marker
== gc_marker
+ GC_OFFSET_GOOD
)
308 if (other
->meta
.gc_marker
!= gc_marker
+ GC_OFFSET_BAD
)
315 /* We were unable to find anything out about this entry, so
316 * let's investigate it later */
317 u
->meta
.gc_marker
= gc_marker
+ GC_OFFSET_UNSURE
;
318 unit_add_to_gc_queue(u
);
322 /* We definitely know that this one is not useful anymore, so
323 * let's mark it for deletion */
324 u
->meta
.gc_marker
= gc_marker
+ GC_OFFSET_BAD
;
325 unit_add_to_cleanup_queue(u
);
329 u
->meta
.gc_marker
= gc_marker
+ GC_OFFSET_GOOD
;
332 static unsigned manager_dispatch_gc_queue(Manager
*m
) {
339 if ((m
->n_in_gc_queue
< GC_QUEUE_ENTRIES_MAX
) &&
340 (m
->gc_queue_timestamp
<= 0 ||
341 (m
->gc_queue_timestamp
+ GC_QUEUE_USEC_MAX
) > now(CLOCK_MONOTONIC
)))
344 log_debug("Running GC...");
346 m
->gc_marker
+= _GC_OFFSET_MAX
;
347 if (m
->gc_marker
+ _GC_OFFSET_MAX
<= _GC_OFFSET_MAX
)
350 gc_marker
= m
->gc_marker
;
352 while ((meta
= m
->gc_queue
)) {
353 assert(meta
->in_gc_queue
);
355 unit_gc_sweep((Unit
*) meta
, gc_marker
);
357 LIST_REMOVE(Meta
, gc_queue
, m
->gc_queue
, meta
);
358 meta
->in_gc_queue
= false;
362 if (meta
->gc_marker
== gc_marker
+ GC_OFFSET_BAD
||
363 meta
->gc_marker
== gc_marker
+ GC_OFFSET_UNSURE
) {
364 log_debug("Collecting %s", meta
->id
);
365 meta
->gc_marker
= gc_marker
+ GC_OFFSET_BAD
;
366 unit_add_to_cleanup_queue((Unit
*) meta
);
370 m
->n_in_gc_queue
= 0;
371 m
->gc_queue_timestamp
= 0;
376 static void manager_clear_jobs_and_units(Manager
*m
) {
382 while ((j
= hashmap_first(m
->transaction_jobs
)))
385 while ((u
= hashmap_first(m
->units
)))
388 manager_dispatch_cleanup_queue(m
);
390 assert(!m
->load_queue
);
391 assert(!m
->run_queue
);
392 assert(!m
->dbus_unit_queue
);
393 assert(!m
->dbus_job_queue
);
394 assert(!m
->cleanup_queue
);
395 assert(!m
->gc_queue
);
397 assert(hashmap_isempty(m
->transaction_jobs
));
398 assert(hashmap_isempty(m
->jobs
));
399 assert(hashmap_isempty(m
->units
));
402 void manager_free(Manager
*m
) {
407 manager_clear_jobs_and_units(m
);
409 for (c
= 0; c
< _UNIT_TYPE_MAX
; c
++)
410 if (unit_vtable
[c
]->shutdown
)
411 unit_vtable
[c
]->shutdown(m
);
413 /* If we reexecute ourselves, we keep the root cgroup
415 manager_shutdown_cgroup(m
, m
->exit_code
!= MANAGER_REEXECUTE
);
419 hashmap_free(m
->units
);
420 hashmap_free(m
->jobs
);
421 hashmap_free(m
->transaction_jobs
);
422 hashmap_free(m
->watch_pids
);
423 hashmap_free(m
->watch_bus
);
425 if (m
->epoll_fd
>= 0)
426 close_nointr_nofail(m
->epoll_fd
);
427 if (m
->signal_watch
.fd
>= 0)
428 close_nointr_nofail(m
->signal_watch
.fd
);
429 if (m
->notify_watch
.fd
>= 0)
430 close_nointr_nofail(m
->notify_watch
.fd
);
432 free(m
->notify_socket
);
434 lookup_paths_free(&m
->lookup_paths
);
435 strv_free(m
->environment
);
437 hashmap_free(m
->cgroup_bondings
);
438 set_free_free(m
->unit_path_cache
);
443 int manager_enumerate(Manager
*m
) {
449 /* Let's ask every type to load all units from disk/kernel
450 * that it might know */
451 for (c
= 0; c
< _UNIT_TYPE_MAX
; c
++)
452 if (unit_vtable
[c
]->enumerate
)
453 if ((q
= unit_vtable
[c
]->enumerate(m
)) < 0)
456 manager_dispatch_load_queue(m
);
460 int manager_coldplug(Manager
*m
) {
468 /* Then, let's set up their initial state. */
469 HASHMAP_FOREACH_KEY(u
, k
, m
->units
, i
) {
475 if ((q
= unit_coldplug(u
)) < 0)
482 static void manager_build_unit_path_cache(Manager
*m
) {
489 set_free_free(m
->unit_path_cache
);
491 if (!(m
->unit_path_cache
= set_new(string_hash_func
, string_compare_func
))) {
492 log_error("Failed to allocate unit path cache.");
496 /* This simply builds a list of files we know exist, so that
497 * we don't always have to go to disk */
499 STRV_FOREACH(i
, m
->lookup_paths
.unit_path
) {
502 if (!(d
= opendir(*i
))) {
503 log_error("Failed to open directory: %m");
507 while ((de
= readdir(d
))) {
510 if (ignore_file(de
->d_name
))
513 if (asprintf(&p
, "%s/%s", streq(*i
, "/") ? "" : *i
, de
->d_name
) < 0) {
518 if ((r
= set_put(m
->unit_path_cache
, p
)) < 0) {
531 log_error("Failed to build unit path cache: %s", strerror(-r
));
533 set_free_free(m
->unit_path_cache
);
534 m
->unit_path_cache
= NULL
;
540 int manager_startup(Manager
*m
, FILE *serialization
, FDSet
*fds
) {
545 manager_build_unit_path_cache(m
);
547 /* First, enumerate what we can from all config files */
548 r
= manager_enumerate(m
);
550 /* Second, deserialize if there is something to deserialize */
552 if ((q
= manager_deserialize(m
, serialization
, fds
)) < 0)
555 /* Third, fire things up! */
556 if ((q
= manager_coldplug(m
)) < 0)
559 /* Now that the initial devices are available, let's see if we
560 * can write the utmp file */
561 manager_write_utmp_reboot(m
);
566 static void transaction_delete_job(Manager
*m
, Job
*j
, bool delete_dependencies
) {
570 /* Deletes one job from the transaction */
572 manager_transaction_unlink_job(m
, j
, delete_dependencies
);
578 static void transaction_delete_unit(Manager
*m
, Unit
*u
) {
581 /* Deletes all jobs associated with a certain unit from the
584 while ((j
= hashmap_get(m
->transaction_jobs
, u
)))
585 transaction_delete_job(m
, j
, true);
588 static void transaction_clean_dependencies(Manager
*m
) {
594 /* Drops all dependencies of all installed jobs */
596 HASHMAP_FOREACH(j
, m
->jobs
, i
) {
597 while (j
->subject_list
)
598 job_dependency_free(j
->subject_list
);
599 while (j
->object_list
)
600 job_dependency_free(j
->object_list
);
603 assert(!m
->transaction_anchor
);
606 static void transaction_abort(Manager
*m
) {
611 while ((j
= hashmap_first(m
->transaction_jobs
)))
613 transaction_delete_job(m
, j
, true);
617 assert(hashmap_isempty(m
->transaction_jobs
));
619 transaction_clean_dependencies(m
);
622 static void transaction_find_jobs_that_matter_to_anchor(Manager
*m
, Job
*j
, unsigned generation
) {
627 /* A recursive sweep through the graph that marks all units
628 * that matter to the anchor job, i.e. are directly or
629 * indirectly a dependency of the anchor job via paths that
630 * are fully marked as mattering. */
635 l
= m
->transaction_anchor
;
637 LIST_FOREACH(subject
, l
, l
) {
639 /* This link does not matter */
643 /* This unit has already been marked */
644 if (l
->object
->generation
== generation
)
647 l
->object
->matters_to_anchor
= true;
648 l
->object
->generation
= generation
;
650 transaction_find_jobs_that_matter_to_anchor(m
, l
->object
, generation
);
654 static void transaction_merge_and_delete_job(Manager
*m
, Job
*j
, Job
*other
, JobType t
) {
655 JobDependency
*l
, *last
;
659 assert(j
->unit
== other
->unit
);
660 assert(!j
->installed
);
662 /* Merges 'other' into 'j' and then deletes j. */
665 j
->state
= JOB_WAITING
;
666 j
->override
= j
->override
|| other
->override
;
668 j
->matters_to_anchor
= j
->matters_to_anchor
|| other
->matters_to_anchor
;
670 /* Patch us in as new owner of the JobDependency objects */
672 LIST_FOREACH(subject
, l
, other
->subject_list
) {
673 assert(l
->subject
== other
);
678 /* Merge both lists */
680 last
->subject_next
= j
->subject_list
;
682 j
->subject_list
->subject_prev
= last
;
683 j
->subject_list
= other
->subject_list
;
686 /* Patch us in as new owner of the JobDependency objects */
688 LIST_FOREACH(object
, l
, other
->object_list
) {
689 assert(l
->object
== other
);
694 /* Merge both lists */
696 last
->object_next
= j
->object_list
;
698 j
->object_list
->object_prev
= last
;
699 j
->object_list
= other
->object_list
;
702 /* Kill the other job */
703 other
->subject_list
= NULL
;
704 other
->object_list
= NULL
;
705 transaction_delete_job(m
, other
, true);
708 static int delete_one_unmergeable_job(Manager
*m
, Job
*j
) {
713 /* Tries to delete one item in the linked list
714 * j->transaction_next->transaction_next->... that conflicts
715 * whith another one, in an attempt to make an inconsistent
716 * transaction work. */
718 /* We rely here on the fact that if a merged with b does not
719 * merge with c, either a or b merge with c neither */
720 LIST_FOREACH(transaction
, j
, j
)
721 LIST_FOREACH(transaction
, k
, j
->transaction_next
) {
724 /* Is this one mergeable? Then skip it */
725 if (job_type_is_mergeable(j
->type
, k
->type
))
728 /* Ok, we found two that conflict, let's see if we can
729 * drop one of them */
730 if (!j
->matters_to_anchor
)
732 else if (!k
->matters_to_anchor
)
737 /* Ok, we can drop one, so let's do so. */
738 log_notice("Trying to fix job merging by deleting job %s/%s", d
->unit
->meta
.id
, job_type_to_string(d
->type
));
739 transaction_delete_job(m
, d
, true);
746 static int transaction_merge_jobs(Manager
*m
, DBusError
*e
) {
753 /* First step, check whether any of the jobs for one specific
754 * task conflict. If so, try to drop one of them. */
755 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
760 LIST_FOREACH(transaction
, k
, j
->transaction_next
) {
761 if ((r
= job_type_merge(&t
, k
->type
)) >= 0)
764 /* OK, we could not merge all jobs for this
765 * action. Let's see if we can get rid of one
768 if ((r
= delete_one_unmergeable_job(m
, j
)) >= 0)
769 /* Ok, we managed to drop one, now
770 * let's ask our callers to call us
771 * again after garbage collecting */
774 /* We couldn't merge anything. Failure */
775 dbus_set_error(e
, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING
, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
776 job_type_to_string(t
), job_type_to_string(k
->type
), k
->unit
->meta
.id
);
781 /* Second step, merge the jobs. */
782 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
786 /* Merge all transactions */
787 LIST_FOREACH(transaction
, k
, j
->transaction_next
)
788 assert_se(job_type_merge(&t
, k
->type
) == 0);
790 /* If an active job is mergeable, merge it too */
791 if (j
->unit
->meta
.job
)
792 job_type_merge(&t
, j
->unit
->meta
.job
->type
); /* Might fail. Which is OK */
794 while ((k
= j
->transaction_next
)) {
796 transaction_merge_and_delete_job(m
, k
, j
, t
);
799 transaction_merge_and_delete_job(m
, j
, k
, t
);
802 assert(!j
->transaction_next
);
803 assert(!j
->transaction_prev
);
809 static void transaction_drop_redundant(Manager
*m
) {
814 /* Goes through the transaction and removes all jobs that are
823 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
824 bool changes_something
= false;
827 LIST_FOREACH(transaction
, k
, j
) {
829 if (!job_is_anchor(k
) &&
830 job_type_is_redundant(k
->type
, unit_active_state(k
->unit
)))
833 changes_something
= true;
837 if (changes_something
)
840 log_debug("Found redundant job %s/%s, dropping.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
841 transaction_delete_job(m
, j
, false);
849 static bool unit_matters_to_anchor(Unit
*u
, Job
*j
) {
851 assert(!j
->transaction_prev
);
853 /* Checks whether at least one of the jobs for this unit
854 * matters to the anchor. */
856 LIST_FOREACH(transaction
, j
, j
)
857 if (j
->matters_to_anchor
)
863 static int transaction_verify_order_one(Manager
*m
, Job
*j
, Job
*from
, unsigned generation
, DBusError
*e
) {
870 assert(!j
->transaction_prev
);
872 /* Does a recursive sweep through the ordering graph, looking
873 * for a cycle. If we find cycle we try to break it. */
875 /* Have we seen this before? */
876 if (j
->generation
== generation
) {
879 /* If the marker is NULL we have been here already and
880 * decided the job was loop-free from here. Hence
881 * shortcut things and return right-away. */
885 /* So, the marker is not NULL and we already have been
886 * here. We have a cycle. Let's try to break it. We go
887 * backwards in our path and try to find a suitable
888 * job to remove. We use the marker to find our way
889 * back, since smart how we are we stored our way back
891 log_warning("Found ordering cycle on %s/%s", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
893 for (k
= from
; k
; k
= ((k
->generation
== generation
&& k
->marker
!= k
) ? k
->marker
: NULL
)) {
895 log_info("Walked on cycle path to %s/%s", k
->unit
->meta
.id
, job_type_to_string(k
->type
));
898 !unit_matters_to_anchor(k
->unit
, k
)) {
899 /* Ok, we can drop this one, so let's
901 log_warning("Breaking order cycle by deleting job %s/%s", k
->unit
->meta
.id
, job_type_to_string(k
->type
));
902 transaction_delete_unit(m
, k
->unit
);
906 /* Check if this in fact was the beginning of
912 log_error("Unable to break cycle");
914 dbus_set_error(e
, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC
, "Transaction order is cyclic. See logs for details.");
918 /* Make the marker point to where we come from, so that we can
919 * find our way backwards if we want to break a cycle. We use
920 * a special marker for the beginning: we point to
922 j
->marker
= from
? from
: j
;
923 j
->generation
= generation
;
925 /* We assume that the the dependencies are bidirectional, and
926 * hence can ignore UNIT_AFTER */
927 SET_FOREACH(u
, j
->unit
->meta
.dependencies
[UNIT_BEFORE
], i
) {
930 /* Is there a job for this unit? */
931 if (!(o
= hashmap_get(m
->transaction_jobs
, u
)))
933 /* Ok, there is no job for this in the
934 * transaction, but maybe there is already one
936 if (!(o
= u
->meta
.job
))
939 if ((r
= transaction_verify_order_one(m
, o
, j
, generation
, e
)) < 0)
943 /* Ok, let's backtrack, and remember that this entry is not on
944 * our path anymore. */
950 static int transaction_verify_order(Manager
*m
, unsigned *generation
, DBusError
*e
) {
959 /* Check if the ordering graph is cyclic. If it is, try to fix
960 * that up by dropping one of the jobs. */
964 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
)
965 if ((r
= transaction_verify_order_one(m
, j
, NULL
, g
, e
)) < 0)
971 static void transaction_collect_garbage(Manager
*m
) {
976 /* Drop jobs that are not required by any other job */
984 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
988 log_debug("Garbage collecting job %s/%s", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
989 transaction_delete_job(m
, j
, true);
997 static int transaction_is_destructive(Manager
*m
, DBusError
*e
) {
1003 /* Checks whether applying this transaction means that
1004 * existing jobs would be replaced */
1006 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1009 assert(!j
->transaction_prev
);
1010 assert(!j
->transaction_next
);
1012 if (j
->unit
->meta
.job
&&
1013 j
->unit
->meta
.job
!= j
&&
1014 !job_type_is_superset(j
->type
, j
->unit
->meta
.job
->type
)) {
1016 dbus_set_error(e
, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE
, "Transaction is destructive.");
1024 static void transaction_minimize_impact(Manager
*m
) {
1028 /* Drops all unnecessary jobs that reverse already active jobs
1029 * or that stop a running service. */
1037 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1038 LIST_FOREACH(transaction
, j
, j
) {
1039 bool stops_running_service
, changes_existing_job
;
1041 /* If it matters, we shouldn't drop it */
1042 if (j
->matters_to_anchor
)
1045 /* Would this stop a running service?
1046 * Would this change an existing job?
1047 * If so, let's drop this entry */
1049 stops_running_service
=
1050 j
->type
== JOB_STOP
&& UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j
->unit
));
1052 changes_existing_job
=
1053 j
->unit
->meta
.job
&& job_type_is_conflicting(j
->type
, j
->unit
->meta
.job
->state
);
1055 if (!stops_running_service
&& !changes_existing_job
)
1058 if (stops_running_service
)
1059 log_info("%s/%s would stop a running service.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1061 if (changes_existing_job
)
1062 log_info("%s/%s would change existing job.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1064 /* Ok, let's get rid of this */
1065 log_info("Deleting %s/%s to minimize impact.", j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1067 transaction_delete_job(m
, j
, true);
1079 static int transaction_apply(Manager
*m
) {
1084 /* Moves the transaction jobs to the set of active jobs */
1086 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1088 assert(!j
->transaction_prev
);
1089 assert(!j
->transaction_next
);
1094 if ((r
= hashmap_put(m
->jobs
, UINT32_TO_PTR(j
->id
), j
)) < 0)
1098 while ((j
= hashmap_steal_first(m
->transaction_jobs
))) {
1102 if (j
->unit
->meta
.job
)
1103 job_free(j
->unit
->meta
.job
);
1105 j
->unit
->meta
.job
= j
;
1106 j
->installed
= true;
1108 /* We're fully installed. Now let's free data we don't
1111 assert(!j
->transaction_next
);
1112 assert(!j
->transaction_prev
);
1114 job_add_to_run_queue(j
);
1115 job_add_to_dbus_queue(j
);
1118 /* As last step, kill all remaining job dependencies. */
1119 transaction_clean_dependencies(m
);
1125 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
1129 hashmap_remove(m
->jobs
, UINT32_TO_PTR(j
->id
));
1135 static int transaction_activate(Manager
*m
, JobMode mode
, DBusError
*e
) {
1137 unsigned generation
= 1;
1141 /* This applies the changes recorded in transaction_jobs to
1142 * the actual list of jobs, if possible. */
1144 /* First step: figure out which jobs matter */
1145 transaction_find_jobs_that_matter_to_anchor(m
, NULL
, generation
++);
1147 /* Second step: Try not to stop any running services if
1148 * we don't have to. Don't try to reverse running
1149 * jobs if we don't have to. */
1150 transaction_minimize_impact(m
);
1152 /* Third step: Drop redundant jobs */
1153 transaction_drop_redundant(m
);
1156 /* Fourth step: Let's remove unneeded jobs that might
1158 transaction_collect_garbage(m
);
1160 /* Fifth step: verify order makes sense and correct
1161 * cycles if necessary and possible */
1162 if ((r
= transaction_verify_order(m
, &generation
, e
)) >= 0)
1166 log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e
, r
));
1170 /* Let's see if the resulting transaction ordering
1171 * graph is still cyclic... */
1175 /* Sixth step: let's drop unmergeable entries if
1176 * necessary and possible, merge entries we can
1178 if ((r
= transaction_merge_jobs(m
, e
)) >= 0)
1182 log_warning("Requested transaction contains unmergable jobs: %s", bus_error(e
, r
));
1186 /* Seventh step: an entry got dropped, let's garbage
1187 * collect its dependencies. */
1188 transaction_collect_garbage(m
);
1190 /* Let's see if the resulting transaction still has
1191 * unmergeable entries ... */
1194 /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1195 transaction_drop_redundant(m
);
1197 /* Ninth step: check whether we can actually apply this */
1198 if (mode
== JOB_FAIL
)
1199 if ((r
= transaction_is_destructive(m
, e
)) < 0) {
1200 log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e
, r
));
1204 /* Tenth step: apply changes */
1205 if ((r
= transaction_apply(m
)) < 0) {
1206 log_warning("Failed to apply transaction: %s", strerror(-r
));
1210 assert(hashmap_isempty(m
->transaction_jobs
));
1211 assert(!m
->transaction_anchor
);
1216 transaction_abort(m
);
1220 static Job
* transaction_add_one_job(Manager
*m
, JobType type
, Unit
*unit
, bool override
, bool *is_new
) {
1227 /* Looks for an axisting prospective job and returns that. If
1228 * it doesn't exist it is created and added to the prospective
1231 f
= hashmap_get(m
->transaction_jobs
, unit
);
1233 LIST_FOREACH(transaction
, j
, f
) {
1234 assert(j
->unit
== unit
);
1236 if (j
->type
== type
) {
1243 if (unit
->meta
.job
&& unit
->meta
.job
->type
== type
)
1245 else if (!(j
= job_new(m
, type
, unit
)))
1250 j
->matters_to_anchor
= false;
1251 j
->override
= override
;
1253 LIST_PREPEND(Job
, transaction
, f
, j
);
1255 if ((r
= hashmap_replace(m
->transaction_jobs
, unit
, f
)) < 0) {
1263 log_debug("Added job %s/%s to transaction.", unit
->meta
.id
, job_type_to_string(type
));
1268 void manager_transaction_unlink_job(Manager
*m
, Job
*j
, bool delete_dependencies
) {
1272 if (j
->transaction_prev
)
1273 j
->transaction_prev
->transaction_next
= j
->transaction_next
;
1274 else if (j
->transaction_next
)
1275 hashmap_replace(m
->transaction_jobs
, j
->unit
, j
->transaction_next
);
1277 hashmap_remove_value(m
->transaction_jobs
, j
->unit
, j
);
1279 if (j
->transaction_next
)
1280 j
->transaction_next
->transaction_prev
= j
->transaction_prev
;
1282 j
->transaction_prev
= j
->transaction_next
= NULL
;
1284 while (j
->subject_list
)
1285 job_dependency_free(j
->subject_list
);
1287 while (j
->object_list
) {
1288 Job
*other
= j
->object_list
->matters
? j
->object_list
->subject
: NULL
;
1290 job_dependency_free(j
->object_list
);
1292 if (other
&& delete_dependencies
) {
1293 log_info("Deleting job %s/%s as dependency of job %s/%s",
1294 other
->unit
->meta
.id
, job_type_to_string(other
->type
),
1295 j
->unit
->meta
.id
, job_type_to_string(j
->type
));
1296 transaction_delete_job(m
, other
, delete_dependencies
);
1301 static int transaction_add_job_and_dependencies(
1317 assert(type
< _JOB_TYPE_MAX
);
1320 if (unit
->meta
.load_state
!= UNIT_LOADED
) {
1321 dbus_set_error(e
, BUS_ERROR_LOAD_FAILED
, "Unit %s failed to load. See logs for details.", unit
->meta
.id
);
1325 if (!unit_job_is_applicable(unit
, type
)) {
1326 dbus_set_error(e
, BUS_ERROR_JOB_TYPE_NOT_APPLICABLE
, "Job type %s is not applicable for unit %s.", job_type_to_string(type
), unit
->meta
.id
);
1330 /* First add the job. */
1331 if (!(ret
= transaction_add_one_job(m
, type
, unit
, override
, &is_new
)))
1334 /* Then, add a link to the job. */
1335 if (!job_dependency_new(by
, ret
, matters
))
1339 /* Finally, recursively add in all dependencies. */
1340 if (type
== JOB_START
|| type
== JOB_RELOAD_OR_START
) {
1341 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRES
], i
)
1342 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, true, override
, e
, NULL
)) < 0 && r
!= -EBADR
)
1345 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
1346 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, !override
, override
, e
, NULL
)) < 0 && r
!= -EBADR
) {
1347 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, bus_error(e
, r
));
1351 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_WANTS
], i
)
1352 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, false, false, e
, NULL
)) < 0) {
1353 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, bus_error(e
, r
));
1357 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUISITE
], i
)
1358 if ((r
= transaction_add_job_and_dependencies(m
, JOB_VERIFY_ACTIVE
, dep
, ret
, true, override
, e
, NULL
)) < 0 && r
!= -EBADR
)
1361 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUISITE_OVERRIDABLE
], i
)
1362 if ((r
= transaction_add_job_and_dependencies(m
, JOB_VERIFY_ACTIVE
, dep
, ret
, !override
, override
, e
, NULL
)) < 0 && r
!= -EBADR
) {
1363 log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep
->meta
.id
, bus_error(e
, r
));
1367 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
1368 if ((r
= transaction_add_job_and_dependencies(m
, JOB_STOP
, dep
, ret
, true, override
, e
, NULL
)) < 0 && r
!= -EBADR
)
1371 } else if (type
== JOB_STOP
|| type
== JOB_RESTART
|| type
== JOB_TRY_RESTART
) {
1373 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
1374 if ((r
= transaction_add_job_and_dependencies(m
, type
, dep
, ret
, true, override
, e
, NULL
)) < 0 && r
!= -EBADR
)
1378 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1390 static int transaction_add_isolate_jobs(Manager
*m
) {
1398 HASHMAP_FOREACH_KEY(u
, k
, m
->units
, i
) {
1400 /* ignore aliases */
1401 if (u
->meta
.id
!= k
)
1404 if (UNIT_VTABLE(u
)->no_isolate
)
1407 /* No need to stop inactive jobs */
1408 if (UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(u
)))
1411 /* Is there already something listed for this? */
1412 if (hashmap_get(m
->transaction_jobs
, u
))
1415 if ((r
= transaction_add_job_and_dependencies(m
, JOB_STOP
, u
, NULL
, true, false, NULL
, NULL
)) < 0)
1416 log_warning("Cannot add isolate job for unit %s, ignoring: %s", u
->meta
.id
, strerror(-r
));
1422 int manager_add_job(Manager
*m
, JobType type
, Unit
*unit
, JobMode mode
, bool override
, DBusError
*e
, Job
**_ret
) {
1427 assert(type
< _JOB_TYPE_MAX
);
1429 assert(mode
< _JOB_MODE_MAX
);
1431 if (mode
== JOB_ISOLATE
&& type
!= JOB_START
) {
1432 dbus_set_error(e
, BUS_ERROR_INVALID_JOB_MODE
, "Isolate is only valid for start.");
1436 log_debug("Trying to enqueue job %s/%s", unit
->meta
.id
, job_type_to_string(type
));
1438 if ((r
= transaction_add_job_and_dependencies(m
, type
, unit
, NULL
, true, override
, e
, &ret
)) < 0) {
1439 transaction_abort(m
);
1443 if (mode
== JOB_ISOLATE
)
1444 if ((r
= transaction_add_isolate_jobs(m
)) < 0) {
1445 transaction_abort(m
);
1449 if ((r
= transaction_activate(m
, mode
, e
)) < 0)
1452 log_debug("Enqueued job %s/%s as %u", unit
->meta
.id
, job_type_to_string(type
), (unsigned) ret
->id
);
1460 int manager_add_job_by_name(Manager
*m
, JobType type
, const char *name
, JobMode mode
, bool override
, DBusError
*e
, Job
**_ret
) {
1465 assert(type
< _JOB_TYPE_MAX
);
1467 assert(mode
< _JOB_MODE_MAX
);
1469 if ((r
= manager_load_unit(m
, name
, NULL
, NULL
, &unit
)) < 0)
1472 return manager_add_job(m
, type
, unit
, mode
, override
, e
, _ret
);
1475 Job
*manager_get_job(Manager
*m
, uint32_t id
) {
1478 return hashmap_get(m
->jobs
, UINT32_TO_PTR(id
));
1481 Unit
*manager_get_unit(Manager
*m
, const char *name
) {
1485 return hashmap_get(m
->units
, name
);
1488 unsigned manager_dispatch_load_queue(Manager
*m
) {
1494 /* Make sure we are not run recursively */
1495 if (m
->dispatching_load_queue
)
1498 m
->dispatching_load_queue
= true;
1500 /* Dispatches the load queue. Takes a unit from the queue and
1501 * tries to load its data until the queue is empty */
1503 while ((meta
= m
->load_queue
)) {
1504 assert(meta
->in_load_queue
);
1506 unit_load((Unit
*) meta
);
1510 m
->dispatching_load_queue
= false;
1514 int manager_load_unit_prepare(Manager
*m
, const char *name
, const char *path
, DBusError
*e
, Unit
**_ret
) {
1519 assert(name
|| path
);
1521 /* This will prepare the unit for loading, but not actually
1522 * load anything from disk. */
1524 if (path
&& !is_path(path
)) {
1525 dbus_set_error(e
, BUS_ERROR_INVALID_PATH
, "Path %s is not absolute.", path
);
1530 name
= file_name_from_path(path
);
1532 if (!unit_name_is_valid(name
)) {
1533 dbus_set_error(e
, BUS_ERROR_INVALID_NAME
, "Unit name %s is not valid.", name
);
1537 if ((ret
= manager_get_unit(m
, name
))) {
1542 if (!(ret
= unit_new(m
)))
1546 if (!(ret
->meta
.fragment_path
= strdup(path
))) {
1551 if ((r
= unit_add_name(ret
, name
)) < 0) {
1556 unit_add_to_load_queue(ret
);
1557 unit_add_to_dbus_queue(ret
);
1558 unit_add_to_gc_queue(ret
);
1566 int manager_load_unit(Manager
*m
, const char *name
, const char *path
, DBusError
*e
, Unit
**_ret
) {
1571 /* This will load the service information files, but not actually
1572 * start any services or anything. */
1574 if ((r
= manager_load_unit_prepare(m
, name
, path
, e
, _ret
)) != 0)
1577 manager_dispatch_load_queue(m
);
1580 *_ret
= unit_follow_merge(*_ret
);
1585 void manager_dump_jobs(Manager
*s
, FILE *f
, const char *prefix
) {
1592 HASHMAP_FOREACH(j
, s
->jobs
, i
)
1593 job_dump(j
, f
, prefix
);
1596 void manager_dump_units(Manager
*s
, FILE *f
, const char *prefix
) {
1604 HASHMAP_FOREACH_KEY(u
, t
, s
->units
, i
)
1605 if (u
->meta
.id
== t
)
1606 unit_dump(u
, f
, prefix
);
1609 void manager_clear_jobs(Manager
*m
) {
1614 transaction_abort(m
);
1616 while ((j
= hashmap_first(m
->jobs
)))
1620 unsigned manager_dispatch_run_queue(Manager
*m
) {
1624 if (m
->dispatching_run_queue
)
1627 m
->dispatching_run_queue
= true;
1629 while ((j
= m
->run_queue
)) {
1630 assert(j
->installed
);
1631 assert(j
->in_run_queue
);
1633 job_run_and_invalidate(j
);
1637 m
->dispatching_run_queue
= false;
1641 unsigned manager_dispatch_dbus_queue(Manager
*m
) {
1648 if (m
->dispatching_dbus_queue
)
1651 m
->dispatching_dbus_queue
= true;
1653 while ((meta
= m
->dbus_unit_queue
)) {
1654 assert(meta
->in_dbus_queue
);
1656 bus_unit_send_change_signal((Unit
*) meta
);
1660 while ((j
= m
->dbus_job_queue
)) {
1661 assert(j
->in_dbus_queue
);
1663 bus_job_send_change_signal(j
);
1667 m
->dispatching_dbus_queue
= false;
1671 static int manager_process_notify_fd(Manager
*m
) {
1678 struct msghdr msghdr
;
1680 struct ucred
*ucred
;
1682 struct cmsghdr cmsghdr
;
1683 uint8_t buf
[CMSG_SPACE(sizeof(struct ucred
))];
1689 iovec
.iov_base
= buf
;
1690 iovec
.iov_len
= sizeof(buf
)-1;
1694 msghdr
.msg_iov
= &iovec
;
1695 msghdr
.msg_iovlen
= 1;
1696 msghdr
.msg_control
= &control
;
1697 msghdr
.msg_controllen
= sizeof(control
);
1699 if ((n
= recvmsg(m
->notify_watch
.fd
, &msghdr
, MSG_DONTWAIT
)) <= 0) {
1703 if (errno
== EAGAIN
)
1709 if (msghdr
.msg_controllen
< CMSG_LEN(sizeof(struct ucred
)) ||
1710 control
.cmsghdr
.cmsg_level
!= SOL_SOCKET
||
1711 control
.cmsghdr
.cmsg_type
!= SCM_CREDENTIALS
||
1712 control
.cmsghdr
.cmsg_len
!= CMSG_LEN(sizeof(struct ucred
))) {
1713 log_warning("Received notify message without credentials. Ignoring.");
1717 ucred
= (struct ucred
*) CMSG_DATA(&control
.cmsghdr
);
1719 if (!(u
= hashmap_get(m
->watch_pids
, LONG_TO_PTR(ucred
->pid
))))
1720 if (!(u
= cgroup_unit_by_pid(m
, ucred
->pid
))) {
1721 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred
->pid
);
1725 assert((size_t) n
< sizeof(buf
));
1727 if (!(tags
= strv_split(buf
, "\n\r")))
1730 log_debug("Got notification message for unit %s", u
->meta
.id
);
1732 if (UNIT_VTABLE(u
)->notify_message
)
1733 UNIT_VTABLE(u
)->notify_message(u
, ucred
->pid
, tags
);
1741 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 %lu (%s)", (unsigned long) si
.si_pid
, strna(name
));
1776 /* Let's flush any message the dying child might still
1777 * have queued for us. This ensures that the process
1778 * still exists in /proc so that we can figure out
1779 * which cgroup and hence unit it belongs to. */
1780 if ((r
= manager_process_notify_fd(m
)) < 0)
1783 /* And now figure out the unit this belongs to */
1784 if (!(u
= hashmap_get(m
->watch_pids
, LONG_TO_PTR(si
.si_pid
))))
1785 u
= cgroup_unit_by_pid(m
, si
.si_pid
);
1787 /* And now, we actually reap the zombie. */
1788 if (waitid(P_PID
, si
.si_pid
, &si
, WEXITED
) < 0) {
1795 if (si
.si_code
!= CLD_EXITED
&& si
.si_code
!= CLD_KILLED
&& si
.si_code
!= CLD_DUMPED
)
1798 log_debug("Child %lu died (code=%s, status=%i/%s)",
1799 (long unsigned) si
.si_pid
,
1800 sigchld_code_to_string(si
.si_code
),
1802 strna(si
.si_code
== CLD_EXITED
? exit_status_to_string(si
.si_status
) : signal_to_string(si
.si_status
)));
1807 log_debug("Child %lu belongs to %s", (long unsigned) si
.si_pid
, u
->meta
.id
);
1809 hashmap_remove(m
->watch_pids
, LONG_TO_PTR(si
.si_pid
));
1810 UNIT_VTABLE(u
)->sigchld_event(u
, si
.si_pid
, si
.si_code
, si
.si_status
);
1816 static int manager_start_target(Manager
*m
, const char *name
, JobMode mode
) {
1820 dbus_error_init(&error
);
1822 log_info("Activating special unit %s", name
);
1824 if ((r
= manager_add_job_by_name(m
, JOB_START
, name
, mode
, true, &error
, NULL
)) < 0)
1825 log_error("Failed to enqueue %s job: %s", name
, bus_error(&error
, r
));
1827 dbus_error_free(&error
);
1832 static int manager_process_signal_fd(Manager
*m
) {
1834 struct signalfd_siginfo sfsi
;
1835 bool sigchld
= false;
1840 if ((n
= read(m
->signal_watch
.fd
, &sfsi
, sizeof(sfsi
))) != sizeof(sfsi
)) {
1845 if (errno
== EAGAIN
)
1851 log_debug("Received SIG%s", strna(signal_to_string(sfsi
.ssi_signo
)));
1853 switch (sfsi
.ssi_signo
) {
1860 if (m
->running_as
== MANAGER_SYSTEM
) {
1861 /* This is for compatibility with the
1862 * original sysvinit */
1863 m
->exit_code
= MANAGER_REEXECUTE
;
1870 if (m
->running_as
== MANAGER_SYSTEM
) {
1871 manager_start_target(m
, SPECIAL_CTRL_ALT_DEL_TARGET
, JOB_REPLACE
);
1875 /* Run the exit target if there is one, if not, just exit. */
1876 if (manager_start_target(m
, SPECIAL_EXIT_SERVICE
, JOB_REPLACE
) < 0) {
1877 m
->exit_code
= MANAGER_EXIT
;
1884 if (m
->running_as
== MANAGER_SYSTEM
)
1885 manager_start_target(m
, SPECIAL_KBREQUEST_TARGET
, JOB_REPLACE
);
1887 /* This is a nop on non-init */
1891 if (m
->running_as
== MANAGER_SYSTEM
)
1892 manager_start_target(m
, SPECIAL_SIGPWR_TARGET
, JOB_REPLACE
);
1894 /* This is a nop on non-init */
1900 u
= manager_get_unit(m
, SPECIAL_DBUS_SERVICE
);
1902 if (!u
|| UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
))) {
1903 log_info("Trying to reconnect to bus...");
1907 if (!u
|| !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
))) {
1908 log_info("Loading D-Bus service...");
1909 manager_start_target(m
, SPECIAL_DBUS_SERVICE
, JOB_REPLACE
);
1920 if (!(f
= open_memstream(&dump
, &size
))) {
1921 log_warning("Failed to allocate memory stream.");
1925 manager_dump_units(m
, f
, "\t");
1926 manager_dump_jobs(m
, f
, "\t");
1931 log_warning("Failed to write status stream");
1936 log_dump(LOG_INFO
, dump
);
1943 m
->exit_code
= MANAGER_RELOAD
;
1947 static const char * const table
[] = {
1948 [0] = SPECIAL_DEFAULT_TARGET
,
1949 [1] = SPECIAL_RESCUE_TARGET
,
1950 [2] = SPECIAL_EMERGENCY_SERVICE
,
1951 [3] = SPECIAL_HALT_TARGET
,
1952 [4] = SPECIAL_POWEROFF_TARGET
,
1953 [5] = SPECIAL_REBOOT_TARGET
1956 if ((int) sfsi
.ssi_signo
>= SIGRTMIN
+0 &&
1957 (int) sfsi
.ssi_signo
< SIGRTMIN
+(int) ELEMENTSOF(table
)) {
1958 manager_start_target(m
, table
[sfsi
.ssi_signo
- SIGRTMIN
],
1959 (sfsi
.ssi_signo
== 1 || sfsi
.ssi_signo
== 2) ? JOB_ISOLATE
: JOB_REPLACE
);
1963 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi
.ssi_signo
)));
1969 return manager_dispatch_sigchld(m
);
1974 static int process_event(Manager
*m
, struct epoll_event
*ev
) {
1981 assert(w
= ev
->data
.ptr
);
1987 /* An incoming signal? */
1988 if (ev
->events
!= EPOLLIN
)
1991 if ((r
= manager_process_signal_fd(m
)) < 0)
1998 /* An incoming daemon notification event? */
1999 if (ev
->events
!= EPOLLIN
)
2002 if ((r
= manager_process_notify_fd(m
)) < 0)
2009 /* Some fd event, to be dispatched to the units */
2010 UNIT_VTABLE(w
->data
.unit
)->fd_event(w
->data
.unit
, w
->fd
, ev
->events
, w
);
2017 /* Some timer event, to be dispatched to the units */
2018 if ((k
= read(w
->fd
, &v
, sizeof(v
))) != sizeof(v
)) {
2020 if (k
< 0 && (errno
== EINTR
|| errno
== EAGAIN
))
2023 return k
< 0 ? -errno
: -EIO
;
2026 UNIT_VTABLE(w
->data
.unit
)->timer_event(w
->data
.unit
, v
, w
);
2031 /* Some mount table change, intended for the mount subsystem */
2032 mount_fd_event(m
, ev
->events
);
2036 /* Some notification from udev, intended for the device subsystem */
2037 device_fd_event(m
, ev
->events
);
2040 case WATCH_DBUS_WATCH
:
2041 bus_watch_event(m
, w
, ev
->events
);
2044 case WATCH_DBUS_TIMEOUT
:
2045 bus_timeout_event(m
, w
, ev
->events
);
2049 assert_not_reached("Unknown epoll event type.");
2055 int manager_loop(Manager
*m
) {
2058 RATELIMIT_DEFINE(rl
, 1*USEC_PER_SEC
, 1000);
2061 m
->exit_code
= MANAGER_RUNNING
;
2063 /* Release the path cache */
2064 set_free_free(m
->unit_path_cache
);
2065 m
->unit_path_cache
= NULL
;
2067 /* There might still be some zombies hanging around from
2068 * before we were exec()'ed. Leat's reap them */
2069 if ((r
= manager_dispatch_sigchld(m
)) < 0)
2072 while (m
->exit_code
== MANAGER_RUNNING
) {
2073 struct epoll_event event
;
2076 if (!ratelimit_test(&rl
)) {
2077 /* Yay, something is going seriously wrong, pause a little */
2078 log_warning("Looping too fast. Throttling execution a little.");
2082 if (manager_dispatch_load_queue(m
) > 0)
2085 if (manager_dispatch_run_queue(m
) > 0)
2088 if (bus_dispatch(m
) > 0)
2091 if (manager_dispatch_cleanup_queue(m
) > 0)
2094 if (manager_dispatch_gc_queue(m
) > 0)
2097 if (manager_dispatch_dbus_queue(m
) > 0)
2100 if ((n
= epoll_wait(m
->epoll_fd
, &event
, 1, -1)) < 0) {
2110 if ((r
= process_event(m
, &event
)) < 0)
2114 return m
->exit_code
;
2117 int manager_get_unit_from_dbus_path(Manager
*m
, const char *s
, Unit
**_u
) {
2125 if (!startswith(s
, "/org/freedesktop/systemd1/unit/"))
2128 if (!(n
= bus_path_unescape(s
+31)))
2131 u
= manager_get_unit(m
, n
);
2142 int manager_get_job_from_dbus_path(Manager
*m
, const char *s
, Job
**_j
) {
2151 if (!startswith(s
, "/org/freedesktop/systemd1/job/"))
2154 if ((r
= safe_atou(s
+ 30, &id
)) < 0)
2157 if (!(j
= manager_get_job(m
, id
)))
2165 static bool manager_utmp_good(Manager
*m
) {
2170 if ((r
= mount_path_is_mounted(m
, _PATH_UTMPX
)) <= 0) {
2173 log_warning("Failed to determine whether " _PATH_UTMPX
" is mounted: %s", strerror(-r
));
2181 void manager_write_utmp_reboot(Manager
*m
) {
2186 if (m
->utmp_reboot_written
)
2189 if (m
->running_as
!= MANAGER_SYSTEM
)
2192 if (!manager_utmp_good(m
))
2195 if ((r
= utmp_put_reboot(m
->startup_timestamp
.realtime
)) < 0) {
2197 if (r
!= -ENOENT
&& r
!= -EROFS
)
2198 log_warning("Failed to write utmp/wtmp: %s", strerror(-r
));
2203 m
->utmp_reboot_written
= true;
2206 void manager_write_utmp_runlevel(Manager
*m
, Unit
*u
) {
2212 if (u
->meta
.type
!= UNIT_TARGET
)
2215 if (m
->running_as
!= MANAGER_SYSTEM
)
2218 if (!manager_utmp_good(m
))
2221 if ((runlevel
= target_get_runlevel(TARGET(u
))) <= 0)
2224 if ((r
= utmp_put_runlevel(0, runlevel
, 0)) < 0) {
2226 if (r
!= -ENOENT
&& r
!= -EROFS
)
2227 log_warning("Failed to write utmp/wtmp: %s", strerror(-r
));
2231 void manager_dispatch_bus_name_owner_changed(
2234 const char* old_owner
,
2235 const char *new_owner
) {
2242 if (!(u
= hashmap_get(m
->watch_bus
, name
)))
2245 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
2248 void manager_dispatch_bus_query_pid_done(
2259 if (!(u
= hashmap_get(m
->watch_bus
, name
)))
2262 UNIT_VTABLE(u
)->bus_query_pid_done(u
, name
, pid
);
2265 int manager_open_serialization(FILE **_f
) {
2273 if (asprintf(&path
, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2276 saved_umask
= umask(0077);
2277 fd
= mkostemp(path
, O_RDWR
|O_CLOEXEC
);
2287 log_debug("Serializing state to %s", path
);
2290 if (!(f
= fdopen(fd
, "w+")) < 0)
2298 int manager_serialize(Manager
*m
, FILE *f
, FDSet
*fds
) {
2308 HASHMAP_FOREACH_KEY(u
, t
, m
->units
, i
) {
2309 if (u
->meta
.id
!= t
)
2312 if (!unit_can_serialize(u
))
2316 fputs(u
->meta
.id
, f
);
2319 if ((r
= unit_serialize(u
, f
, fds
)) < 0)
2329 int manager_deserialize(Manager
*m
, FILE *f
, FDSet
*fds
) {
2335 log_debug("Deserializing state...");
2337 m
->deserializing
= true;
2341 char name
[UNIT_NAME_MAX
+2];
2344 if (!fgets(name
, sizeof(name
), f
)) {
2354 if ((r
= manager_load_unit(m
, strstrip(name
), NULL
, NULL
, &u
)) < 0)
2357 if ((r
= unit_deserialize(u
, f
, fds
)) < 0)
2369 m
->deserializing
= false;
2374 int manager_reload(Manager
*m
) {
2381 if ((r
= manager_open_serialization(&f
)) < 0)
2384 if (!(fds
= fdset_new())) {
2389 if ((r
= manager_serialize(m
, f
, fds
)) < 0)
2392 if (fseeko(f
, 0, SEEK_SET
) < 0) {
2397 /* From here on there is no way back. */
2398 manager_clear_jobs_and_units(m
);
2400 /* Find new unit paths */
2401 lookup_paths_free(&m
->lookup_paths
);
2402 if ((q
= lookup_paths_init(&m
->lookup_paths
, m
->running_as
)) < 0)
2405 /* First, enumerate what we can from all config files */
2406 if ((q
= manager_enumerate(m
)) < 0)
2409 /* Second, deserialize our stored data */
2410 if ((q
= manager_deserialize(m
, f
, fds
)) < 0)
2416 /* Third, fire things up! */
2417 if ((q
= manager_coldplug(m
)) < 0)
2430 bool manager_is_booting_or_shutting_down(Manager
*m
) {
2435 /* Is the initial job still around? */
2436 if (manager_get_job(m
, 1))
2439 /* Is there a job for the shutdown target? */
2440 if (((u
= manager_get_unit(m
, SPECIAL_SHUTDOWN_TARGET
))))
2441 return !!u
->meta
.job
;
2446 static const char* const manager_running_as_table
[_MANAGER_RUNNING_AS_MAX
] = {
2447 [MANAGER_SYSTEM
] = "system",
2448 [MANAGER_SESSION
] = "session"
2451 DEFINE_STRING_TABLE_LOOKUP(manager_running_as
, ManagerRunningAs
);