1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
8 #include <sys/signalfd.h>
20 static const char * const special_table
[_SPECIAL_UNIT_MAX
] = {
21 [SPECIAL_SYSLOG_SERVICE
] = "syslog.service",
22 [SPECIAL_DBUS_SERVICE
] = "messagebus.service",
23 [SPECIAL_LOGGER_SOCKET
] = "systemd-logger.socket",
24 [SPECIAL_KBREQUEST_TARGET
] = "kbrequest.target",
25 [SPECIAL_CTRL_ALT_DEL_TARGET
] = "ctrl-alt-del.target"
28 static int manager_setup_signals(Manager
*m
) {
30 struct epoll_event ev
;
34 assert_se(reset_all_signal_handlers() == 0);
36 assert_se(sigemptyset(&mask
) == 0);
37 assert_se(sigaddset(&mask
, SIGCHLD
) == 0);
38 assert_se(sigaddset(&mask
, SIGINT
) == 0); /* Kernel sends us this on control-alt-del */
39 assert_se(sigaddset(&mask
, SIGWINCH
) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */
40 assert_se(sigaddset(&mask
, SIGTERM
) == 0);
41 assert_se(sigaddset(&mask
, SIGHUP
) == 0);
42 assert_se(sigaddset(&mask
, SIGUSR1
) == 0);
43 assert_se(sigaddset(&mask
, SIGUSR2
) == 0);
44 assert_se(sigaddset(&mask
, SIGPIPE
) == 0);
45 assert_se(sigprocmask(SIG_SETMASK
, &mask
, NULL
) == 0);
47 m
->signal_watch
.type
= WATCH_SIGNAL_FD
;
48 if ((m
->signal_watch
.fd
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
)) < 0)
53 ev
.data
.ptr
= &m
->signal_watch
;
55 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, m
->signal_watch
.fd
, &ev
) < 0)
61 static int manager_load_special_units(Manager
*m
) {
67 /* Loads all 'special' units, so that we have easy access to them later */
69 for (c
= 0; c
< _SPECIAL_UNIT_MAX
; c
++)
70 if ((r
= manager_load_unit(m
, special_table
[c
], m
->special_units
+c
)) < 0)
76 Manager
* manager_new(void) {
79 if (!(m
= new0(Manager
, 1)))
82 m
->signal_watch
.fd
= m
->epoll_fd
= -1;
84 if (!(m
->units
= hashmap_new(string_hash_func
, string_compare_func
)))
87 if (!(m
->jobs
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
90 if (!(m
->transaction_jobs
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
93 if (!(m
->watch_pids
= hashmap_new(trivial_hash_func
, trivial_compare_func
)))
96 if ((m
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
)) < 0)
99 if (manager_setup_signals(m
) < 0)
102 if (manager_load_special_units(m
) < 0)
112 void manager_free(Manager
*m
) {
118 while ((j
= hashmap_first(m
->transaction_jobs
)))
121 while ((u
= hashmap_first(m
->units
)))
124 hashmap_free(m
->units
);
125 hashmap_free(m
->jobs
);
126 hashmap_free(m
->transaction_jobs
);
127 hashmap_free(m
->watch_pids
);
129 if (m
->epoll_fd
>= 0)
130 close_nointr(m
->epoll_fd
);
131 if (m
->signal_watch
.fd
>= 0)
132 close_nointr(m
->signal_watch
.fd
);
137 static void transaction_delete_job(Manager
*m
, Job
*j
) {
141 /* Deletes one job from the transaction */
143 manager_transaction_unlink_job(m
, j
);
149 static void transaction_delete_unit(Manager
*m
, Unit
*u
) {
152 /* Deletes all jobs associated with a certain unit from the
155 while ((j
= hashmap_get(m
->transaction_jobs
, u
)))
156 transaction_delete_job(m
, j
);
159 static void transaction_clean_dependencies(Manager
*m
) {
165 /* Drops all dependencies of all installed jobs */
167 HASHMAP_FOREACH(j
, m
->jobs
, i
) {
168 while (j
->subject_list
)
169 job_dependency_free(j
->subject_list
);
170 while (j
->object_list
)
171 job_dependency_free(j
->object_list
);
174 assert(!m
->transaction_anchor
);
177 static void transaction_abort(Manager
*m
) {
182 while ((j
= hashmap_first(m
->transaction_jobs
)))
184 transaction_delete_job(m
, j
);
188 assert(hashmap_isempty(m
->transaction_jobs
));
190 transaction_clean_dependencies(m
);
193 static void transaction_find_jobs_that_matter_to_anchor(Manager
*m
, Job
*j
, unsigned generation
) {
198 /* A recursive sweep through the graph that marks all units
199 * that matter to the anchor job, i.e. are directly or
200 * indirectly a dependency of the anchor job via paths that
201 * are fully marked as mattering. */
206 l
= m
->transaction_anchor
;
208 LIST_FOREACH(subject
, l
, l
) {
210 /* This link does not matter */
214 /* This unit has already been marked */
215 if (l
->object
->generation
== generation
)
218 l
->object
->matters_to_anchor
= true;
219 l
->object
->generation
= generation
;
221 transaction_find_jobs_that_matter_to_anchor(m
, l
->object
, generation
);
225 static void transaction_merge_and_delete_job(Manager
*m
, Job
*j
, Job
*other
, JobType t
) {
226 JobDependency
*l
, *last
;
230 assert(j
->unit
== other
->unit
);
231 assert(!j
->installed
);
233 /* Merges 'other' into 'j' and then deletes j. */
236 j
->state
= JOB_WAITING
;
237 j
->forced
= j
->forced
|| other
->forced
;
239 j
->matters_to_anchor
= j
->matters_to_anchor
|| other
->matters_to_anchor
;
241 /* Patch us in as new owner of the JobDependency objects */
243 LIST_FOREACH(subject
, l
, other
->subject_list
) {
244 assert(l
->subject
== other
);
249 /* Merge both lists */
251 last
->subject_next
= j
->subject_list
;
253 j
->subject_list
->subject_prev
= last
;
254 j
->subject_list
= other
->subject_list
;
257 /* Patch us in as new owner of the JobDependency objects */
259 LIST_FOREACH(object
, l
, other
->object_list
) {
260 assert(l
->object
== other
);
265 /* Merge both lists */
267 last
->object_next
= j
->object_list
;
269 j
->object_list
->object_prev
= last
;
270 j
->object_list
= other
->object_list
;
273 /* Kill the other job */
274 other
->subject_list
= NULL
;
275 other
->object_list
= NULL
;
276 transaction_delete_job(m
, other
);
279 static int delete_one_unmergeable_job(Manager
*m
, Job
*j
) {
284 /* Tries to delete one item in the linked list
285 * j->transaction_next->transaction_next->... that conflicts
286 * whith another one, in an attempt to make an inconsistent
287 * transaction work. */
289 /* We rely here on the fact that if a merged with b does not
290 * merge with c, either a or b merge with c neither */
291 LIST_FOREACH(transaction
, j
, j
)
292 LIST_FOREACH(transaction
, k
, j
->transaction_next
) {
295 /* Is this one mergeable? Then skip it */
296 if (job_type_is_mergeable(j
->type
, k
->type
))
299 /* Ok, we found two that conflict, let's see if we can
300 * drop one of them */
301 if (!j
->matters_to_anchor
)
303 else if (!k
->matters_to_anchor
)
308 /* Ok, we can drop one, so let's do so. */
309 log_debug("Try to fix job merging by deleting job %s/%s", unit_id(d
->unit
), job_type_to_string(d
->type
));
310 transaction_delete_job(m
, d
);
317 static int transaction_merge_jobs(Manager
*m
) {
324 /* First step, check whether any of the jobs for one specific
325 * task conflict. If so, try to drop one of them. */
326 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
331 LIST_FOREACH(transaction
, k
, j
->transaction_next
) {
332 if ((r
= job_type_merge(&t
, k
->type
)) >= 0)
335 /* OK, we could not merge all jobs for this
336 * action. Let's see if we can get rid of one
339 if ((r
= delete_one_unmergeable_job(m
, j
)) >= 0)
340 /* Ok, we managed to drop one, now
341 * let's ask our callers to call us
342 * again after garbage collecting */
345 /* We couldn't merge anything. Failure */
350 /* Second step, merge the jobs. */
351 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
355 /* Merge all transactions */
356 LIST_FOREACH(transaction
, k
, j
->transaction_next
)
357 assert_se(job_type_merge(&t
, k
->type
) == 0);
359 /* If an active job is mergeable, merge it too */
360 if (j
->unit
->meta
.job
)
361 job_type_merge(&t
, j
->unit
->meta
.job
->type
); /* Might fail. Which is OK */
363 while ((k
= j
->transaction_next
)) {
365 transaction_merge_and_delete_job(m
, k
, j
, t
);
368 transaction_merge_and_delete_job(m
, j
, k
, t
);
371 assert(!j
->transaction_next
);
372 assert(!j
->transaction_prev
);
378 static bool unit_matters_to_anchor(Unit
*u
, Job
*j
) {
380 assert(!j
->transaction_prev
);
382 /* Checks whether at least one of the jobs for this unit
383 * matters to the anchor. */
385 LIST_FOREACH(transaction
, j
, j
)
386 if (j
->matters_to_anchor
)
392 static int transaction_verify_order_one(Manager
*m
, Job
*j
, Job
*from
, unsigned generation
) {
399 assert(!j
->transaction_prev
);
401 /* Does a recursive sweep through the ordering graph, looking
402 * for a cycle. If we find cycle we try to break it. */
404 /* Did we find a cycle? */
405 if (j
->marker
&& j
->generation
== generation
) {
408 /* So, we already have been here. We have a
409 * cycle. Let's try to break it. We go backwards in
410 * our path and try to find a suitable job to
411 * remove. We use the marker to find our way back,
412 * since smart how we are we stored our way back in
415 for (k
= from
; k
; k
= (k
->generation
== generation
? k
->marker
: NULL
)) {
418 !unit_matters_to_anchor(k
->unit
, k
)) {
419 /* Ok, we can drop this one, so let's
421 log_debug("Breaking order cycle by deleting job %s/%s", unit_id(k
->unit
), job_type_to_string(k
->type
));
422 transaction_delete_unit(m
, k
->unit
);
426 /* Check if this in fact was the beginning of
435 /* Make the marker point to where we come from, so that we can
436 * find our way backwards if we want to break a cycle */
438 j
->generation
= generation
;
440 /* We assume that the the dependencies are bidirectional, and
441 * hence can ignore UNIT_AFTER */
442 SET_FOREACH(u
, j
->unit
->meta
.dependencies
[UNIT_BEFORE
], i
) {
445 /* Is there a job for this unit? */
446 if (!(o
= hashmap_get(m
->transaction_jobs
, u
)))
448 /* Ok, there is no job for this in the
449 * transaction, but maybe there is already one
451 if (!(o
= u
->meta
.job
))
454 if ((r
= transaction_verify_order_one(m
, o
, j
, generation
)) < 0)
461 static int transaction_verify_order(Manager
*m
, unsigned *generation
) {
469 /* Check if the ordering graph is cyclic. If it is, try to fix
470 * that up by dropping one of the jobs. */
472 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
)
473 if ((r
= transaction_verify_order_one(m
, j
, NULL
, (*generation
)++)) < 0)
479 static void transaction_collect_garbage(Manager
*m
) {
484 /* Drop jobs that are not required by any other job */
492 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
496 log_debug("Garbage collecting job %s/%s", unit_id(j
->unit
), job_type_to_string(j
->type
));
497 transaction_delete_job(m
, j
);
505 static int transaction_is_destructive(Manager
*m
, JobMode mode
) {
511 /* Checks whether applying this transaction means that
512 * existing jobs would be replaced */
514 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
517 assert(!j
->transaction_prev
);
518 assert(!j
->transaction_next
);
520 if (j
->unit
->meta
.job
&&
521 j
->unit
->meta
.job
!= j
&&
522 !job_type_is_superset(j
->type
, j
->unit
->meta
.job
->type
))
529 static void transaction_minimize_impact(Manager
*m
) {
533 /* Drops all unnecessary jobs that reverse already active jobs
534 * or that stop a running service. */
542 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
543 LIST_FOREACH(transaction
, j
, j
) {
545 /* If it matters, we shouldn't drop it */
546 if (j
->matters_to_anchor
)
549 /* Would this stop a running service?
550 * Would this change an existing job?
551 * If so, let's drop this entry */
552 if ((j
->type
!= JOB_STOP
|| UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(j
->unit
))) &&
553 (!j
->unit
->meta
.job
|| job_type_is_conflicting(j
->type
, j
->unit
->meta
.job
->state
)))
556 /* Ok, let's get rid of this */
557 log_debug("Deleting %s/%s to minimize impact", unit_id(j
->unit
), job_type_to_string(j
->type
));
558 transaction_delete_job(m
, j
);
570 static int transaction_apply(Manager
*m
, JobMode mode
) {
575 /* Moves the transaction jobs to the set of active jobs */
577 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
579 assert(!j
->transaction_prev
);
580 assert(!j
->transaction_next
);
585 if ((r
= hashmap_put(m
->jobs
, UINT32_TO_PTR(j
->id
), j
)) < 0)
589 while ((j
= hashmap_steal_first(m
->transaction_jobs
))) {
593 if (j
->unit
->meta
.job
)
594 job_free(j
->unit
->meta
.job
);
596 j
->unit
->meta
.job
= j
;
599 /* We're fully installed. Now let's free data we don't
602 assert(!j
->transaction_next
);
603 assert(!j
->transaction_prev
);
608 /* As last step, kill all remaining job dependencies. */
609 transaction_clean_dependencies(m
);
615 HASHMAP_FOREACH(j
, m
->transaction_jobs
, i
) {
619 hashmap_remove(m
->jobs
, UINT32_TO_PTR(j
->id
));
625 static int transaction_activate(Manager
*m
, JobMode mode
) {
627 unsigned generation
= 1;
631 /* This applies the changes recorded in transaction_jobs to
632 * the actual list of jobs, if possible. */
634 /* First step: figure out which jobs matter */
635 transaction_find_jobs_that_matter_to_anchor(m
, NULL
, generation
++);
637 /* Second step: Try not to stop any running services if
638 * we don't have to. Don't try to reverse running
639 * jobs if we don't have to. */
640 transaction_minimize_impact(m
);
643 /* Third step: Let's remove unneeded jobs that might
645 transaction_collect_garbage(m
);
647 /* Fourth step: verify order makes sense and correct
648 * cycles if necessary and possible */
649 if ((r
= transaction_verify_order(m
, &generation
)) >= 0)
655 /* Let's see if the resulting transaction ordering
656 * graph is still cyclic... */
660 /* Fifth step: let's drop unmergeable entries if
661 * necessary and possible, merge entries we can
663 if ((r
= transaction_merge_jobs(m
)) >= 0)
669 /* Sixth step: an entry got dropped, let's garbage
670 * collect its dependencies. */
671 transaction_collect_garbage(m
);
673 /* Let's see if the resulting transaction still has
674 * unmergeable entries ... */
677 /* Seventh step: check whether we can actually apply this */
678 if (mode
== JOB_FAIL
)
679 if ((r
= transaction_is_destructive(m
, mode
)) < 0)
682 /* Eights step: apply changes */
683 if ((r
= transaction_apply(m
, mode
)) < 0)
686 assert(hashmap_isempty(m
->transaction_jobs
));
687 assert(!m
->transaction_anchor
);
692 transaction_abort(m
);
696 static Job
* transaction_add_one_job(Manager
*m
, JobType type
, Unit
*unit
, bool force
, bool *is_new
) {
703 /* Looks for an axisting prospective job and returns that. If
704 * it doesn't exist it is created and added to the prospective
707 f
= hashmap_get(m
->transaction_jobs
, unit
);
709 LIST_FOREACH(transaction
, j
, f
) {
710 assert(j
->unit
== unit
);
712 if (j
->type
== type
) {
719 if (unit
->meta
.job
&& unit
->meta
.job
->type
== type
)
721 else if (!(j
= job_new(m
, type
, unit
)))
726 j
->matters_to_anchor
= false;
729 LIST_PREPEND(Job
, transaction
, f
, j
);
731 if ((r
= hashmap_replace(m
->transaction_jobs
, unit
, f
)) < 0) {
742 void manager_transaction_unlink_job(Manager
*m
, Job
*j
) {
746 if (j
->transaction_prev
)
747 j
->transaction_prev
->transaction_next
= j
->transaction_next
;
748 else if (j
->transaction_next
)
749 hashmap_replace(m
->transaction_jobs
, j
->unit
, j
->transaction_next
);
751 hashmap_remove_value(m
->transaction_jobs
, j
->unit
, j
);
753 if (j
->transaction_next
)
754 j
->transaction_next
->transaction_prev
= j
->transaction_prev
;
756 j
->transaction_prev
= j
->transaction_next
= NULL
;
758 while (j
->subject_list
)
759 job_dependency_free(j
->subject_list
);
761 while (j
->object_list
) {
762 Job
*other
= j
->object_list
->matters
? j
->object_list
->subject
: NULL
;
764 job_dependency_free(j
->object_list
);
767 log_debug("Deleting job %s/%s as dependency of job %s/%s",
768 unit_id(other
->unit
), job_type_to_string(other
->type
),
769 unit_id(j
->unit
), job_type_to_string(j
->type
));
770 transaction_delete_job(m
, other
);
775 static int transaction_add_job_and_dependencies(Manager
*m
, JobType type
, Unit
*unit
, Job
*by
, bool matters
, bool force
, Job
**_ret
) {
783 assert(type
< _JOB_TYPE_MAX
);
786 if (unit
->meta
.load_state
!= UNIT_LOADED
)
789 if (!unit_job_is_applicable(unit
, type
))
792 /* First add the job. */
793 if (!(ret
= transaction_add_one_job(m
, type
, unit
, force
, &is_new
)))
796 /* Then, add a link to the job. */
797 if (!job_dependency_new(by
, ret
, matters
))
801 /* Finally, recursively add in all dependencies. */
802 if (type
== JOB_START
|| type
== JOB_RELOAD_OR_START
) {
803 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRES
], i
)
804 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, true, force
, NULL
)) < 0 && r
!= -EBADR
)
806 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_SOFT_REQUIRES
], i
)
807 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, !force
, force
, NULL
)) < 0 && r
!= -EBADR
)
809 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_WANTS
], i
)
810 if ((r
= transaction_add_job_and_dependencies(m
, JOB_START
, dep
, ret
, false, force
, NULL
)) < 0 && r
!= -EBADR
)
812 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUISITE
], i
)
813 if ((r
= transaction_add_job_and_dependencies(m
, JOB_VERIFY_ACTIVE
, dep
, ret
, true, force
, NULL
)) < 0 && r
!= -EBADR
)
815 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_SOFT_REQUISITE
], i
)
816 if ((r
= transaction_add_job_and_dependencies(m
, JOB_VERIFY_ACTIVE
, dep
, ret
, !force
, force
, NULL
)) < 0 && r
!= -EBADR
)
818 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
819 if ((r
= transaction_add_job_and_dependencies(m
, JOB_STOP
, dep
, ret
, true, force
, NULL
)) < 0 && r
!= -EBADR
)
822 } else if (type
== JOB_STOP
|| type
== JOB_RESTART
|| type
== JOB_TRY_RESTART
) {
824 SET_FOREACH(dep
, ret
->unit
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
825 if ((r
= transaction_add_job_and_dependencies(m
, type
, dep
, ret
, true, force
, NULL
)) < 0 && r
!= -EBADR
)
829 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
838 int manager_add_job(Manager
*m
, JobType type
, Unit
*unit
, JobMode mode
, bool force
, Job
**_ret
) {
843 assert(type
< _JOB_TYPE_MAX
);
845 assert(mode
< _JOB_MODE_MAX
);
847 if ((r
= transaction_add_job_and_dependencies(m
, type
, unit
, NULL
, true, force
, &ret
))) {
848 transaction_abort(m
);
852 if ((r
= transaction_activate(m
, mode
)) < 0)
861 Job
*manager_get_job(Manager
*m
, uint32_t id
) {
864 return hashmap_get(m
->jobs
, UINT32_TO_PTR(id
));
867 Unit
*manager_get_unit(Manager
*m
, const char *name
) {
871 return hashmap_get(m
->units
, name
);
874 static void dispatch_load_queue(Manager
*m
) {
879 /* Make sure we are not run recursively */
880 if (m
->dispatching_load_queue
)
883 m
->dispatching_load_queue
= true;
885 /* Dispatches the load queue. Takes a unit from the queue and
886 * tries to load its data until the queue is empty */
888 while ((meta
= m
->load_queue
)) {
889 assert(meta
->in_load_queue
);
891 unit_load(UNIT(meta
));
894 m
->dispatching_load_queue
= false;
897 int manager_load_unit(Manager
*m
, const char *path
, Unit
**_ret
) {
906 /* This will load the service information files, but not actually
907 * start any services or anything. */
909 name
= file_name_from_path(path
);
911 if ((ret
= manager_get_unit(m
, name
))) {
916 if (!(ret
= unit_new(m
)))
920 if (!(ret
->meta
.load_path
= strdup(path
))) {
926 if ((r
= unit_add_name(ret
, name
)) < 0) {
931 unit_add_to_load_queue(ret
);
932 dispatch_load_queue(m
);
938 void manager_dump_jobs(Manager
*s
, FILE *f
, const char *prefix
) {
945 HASHMAP_FOREACH(j
, s
->jobs
, i
)
946 job_dump(j
, f
, prefix
);
949 void manager_dump_units(Manager
*s
, FILE *f
, const char *prefix
) {
957 HASHMAP_FOREACH_KEY(u
, t
, s
->units
, i
)
959 unit_dump(u
, f
, prefix
);
962 void manager_clear_jobs(Manager
*m
) {
967 transaction_abort(m
);
969 while ((j
= hashmap_first(m
->jobs
)))
973 void manager_dispatch_run_queue(Manager
*m
) {
976 if (m
->dispatching_run_queue
)
979 m
->dispatching_run_queue
= true;
981 while ((j
= m
->run_queue
)) {
982 assert(j
->installed
);
983 assert(j
->in_run_queue
);
985 job_run_and_invalidate(j
);
988 m
->dispatching_run_queue
= false;
991 static int manager_dispatch_sigchld(Manager
*m
) {
994 log_debug("dispatching SIGCHLD");
1001 if (waitid(P_ALL
, 0, &si
, WEXITED
|WNOHANG
) < 0) {
1003 if (errno
== ECHILD
)
1012 if (si
.si_code
!= CLD_EXITED
&& si
.si_code
!= CLD_KILLED
&& si
.si_code
!= CLD_DUMPED
)
1015 log_debug("child %llu died (code=%s, status=%i)", (long long unsigned) si
.si_pid
, sigchld_code(si
.si_code
), si
.si_status
);
1017 if (!(u
= hashmap_remove(m
->watch_pids
, UINT32_TO_PTR(si
.si_pid
))))
1020 UNIT_VTABLE(u
)->sigchld_event(u
, si
.si_pid
, si
.si_code
, si
.si_status
);
1026 static int manager_process_signal_fd(Manager
*m
, bool *quit
) {
1028 struct signalfd_siginfo sfsi
;
1029 bool sigchld
= false;
1034 if ((n
= read(m
->signal_watch
.fd
, &sfsi
, sizeof(sfsi
))) != sizeof(sfsi
)) {
1039 if (errno
== EAGAIN
)
1045 switch (sfsi
.ssi_signo
) {
1057 log_info("Got unhandled signal <%s>.", strsignal(sfsi
.ssi_signo
));
1062 return manager_dispatch_sigchld(m
);
1067 static int process_event(Manager
*m
, struct epoll_event
*ev
, bool *quit
) {
1074 assert(w
= ev
->data
.ptr
);
1078 case WATCH_SIGNAL_FD
:
1080 /* An incoming signal? */
1081 if (ev
->events
!= POLLIN
)
1084 if ((r
= manager_process_signal_fd(m
, quit
)) < 0)
1091 /* Some fd event, to be dispatched to the units */
1092 UNIT_VTABLE(w
->unit
)->fd_event(w
->unit
, w
->fd
, ev
->events
, w
);
1099 /* Some timer event, to be dispatched to the units */
1100 if ((k
= read(ev
->data
.fd
, &v
, sizeof(v
))) != sizeof(v
)) {
1102 if (k
< 0 && (errno
== EINTR
|| errno
== EAGAIN
))
1105 return k
< 0 ? -errno
: -EIO
;
1108 UNIT_VTABLE(w
->unit
)->timer_event(w
->unit
, v
, w
);
1113 assert_not_reached("Unknown epoll event type.");
1119 int manager_loop(Manager
*m
) {
1126 struct epoll_event event
;
1129 manager_dispatch_run_queue(m
);
1131 if ((n
= epoll_wait(m
->epoll_fd
, &event
, 1, -1)) < 0) {
1133 if (errno
== -EINTR
)
1141 if ((r
= process_event(m
, &event
, &quit
)) < 0)