1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/prctl.h>
29 #include "sd-messages.h"
31 #include "alloc-util.h"
32 #include "bus-common-errors.h"
34 #include "cgroup-util.h"
35 #include "dbus-unit.h"
41 #include "fileio-label.h"
42 #include "format-util.h"
44 #include "id128-util.h"
46 #include "load-dropin.h"
47 #include "load-fragment.h"
52 #include "parse-util.h"
53 #include "path-util.h"
54 #include "process-util.h"
56 #include "signal-util.h"
57 #include "sparse-endian.h"
59 #include "specifier.h"
60 #include "stat-util.h"
61 #include "stdio-util.h"
62 #include "string-table.h"
63 #include "string-util.h"
65 #include "umask-util.h"
66 #include "unit-name.h"
68 #include "user-util.h"
71 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
72 [UNIT_SERVICE
] = &service_vtable
,
73 [UNIT_SOCKET
] = &socket_vtable
,
74 [UNIT_TARGET
] = &target_vtable
,
75 [UNIT_DEVICE
] = &device_vtable
,
76 [UNIT_MOUNT
] = &mount_vtable
,
77 [UNIT_AUTOMOUNT
] = &automount_vtable
,
78 [UNIT_SWAP
] = &swap_vtable
,
79 [UNIT_TIMER
] = &timer_vtable
,
80 [UNIT_PATH
] = &path_vtable
,
81 [UNIT_SLICE
] = &slice_vtable
,
82 [UNIT_SCOPE
] = &scope_vtable
,
85 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
);
87 Unit
*unit_new(Manager
*m
, size_t size
) {
91 assert(size
>= sizeof(Unit
));
97 u
->names
= set_new(&string_hash_ops
);
102 u
->type
= _UNIT_TYPE_INVALID
;
103 u
->default_dependencies
= true;
104 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
105 u
->unit_file_preset
= -1;
106 u
->on_failure_job_mode
= JOB_REPLACE
;
107 u
->cgroup_inotify_wd
= -1;
108 u
->job_timeout
= USEC_INFINITY
;
109 u
->job_running_timeout
= USEC_INFINITY
;
110 u
->ref_uid
= UID_INVALID
;
111 u
->ref_gid
= GID_INVALID
;
112 u
->cpu_usage_last
= NSEC_INFINITY
;
113 u
->cgroup_bpf_state
= UNIT_CGROUP_BPF_INVALIDATED
;
115 u
->ip_accounting_ingress_map_fd
= -1;
116 u
->ip_accounting_egress_map_fd
= -1;
117 u
->ipv4_allow_map_fd
= -1;
118 u
->ipv6_allow_map_fd
= -1;
119 u
->ipv4_deny_map_fd
= -1;
120 u
->ipv6_deny_map_fd
= -1;
122 u
->last_section_private
= -1;
124 RATELIMIT_INIT(u
->start_limit
, m
->default_start_limit_interval
, m
->default_start_limit_burst
);
125 RATELIMIT_INIT(u
->auto_stop_ratelimit
, 10 * USEC_PER_SEC
, 16);
130 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
134 u
= unit_new(m
, size
);
138 r
= unit_add_name(u
, name
);
148 bool unit_has_name(Unit
*u
, const char *name
) {
152 return set_contains(u
->names
, (char*) name
);
155 static void unit_init(Unit
*u
) {
162 assert(u
->type
>= 0);
164 cc
= unit_get_cgroup_context(u
);
166 cgroup_context_init(cc
);
168 /* Copy in the manager defaults into the cgroup
169 * context, _before_ the rest of the settings have
170 * been initialized */
172 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
173 cc
->io_accounting
= u
->manager
->default_io_accounting
;
174 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
175 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
176 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
177 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
178 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
180 if (u
->type
!= UNIT_SLICE
)
181 cc
->tasks_max
= u
->manager
->default_tasks_max
;
184 ec
= unit_get_exec_context(u
);
186 exec_context_init(ec
);
188 ec
->keyring_mode
= MANAGER_IS_SYSTEM(u
->manager
) ?
189 EXEC_KEYRING_PRIVATE
: EXEC_KEYRING_INHERIT
;
192 kc
= unit_get_kill_context(u
);
194 kill_context_init(kc
);
196 if (UNIT_VTABLE(u
)->init
)
197 UNIT_VTABLE(u
)->init(u
);
200 int unit_add_name(Unit
*u
, const char *text
) {
201 _cleanup_free_
char *s
= NULL
, *i
= NULL
;
208 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
213 r
= unit_name_replace_instance(text
, u
->instance
, &s
);
222 if (set_contains(u
->names
, s
))
224 if (hashmap_contains(u
->manager
->units
, s
))
227 if (!unit_name_is_valid(s
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
230 t
= unit_name_to_type(s
);
234 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
237 r
= unit_name_to_instance(s
, &i
);
241 if (i
&& !unit_type_may_template(t
))
244 /* Ensure that this unit is either instanced or not instanced,
245 * but not both. Note that we do allow names with different
246 * instance names however! */
247 if (u
->type
!= _UNIT_TYPE_INVALID
&& !u
->instance
!= !i
)
250 if (!unit_type_may_alias(t
) && !set_isempty(u
->names
))
253 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
256 r
= set_put(u
->names
, s
);
261 r
= hashmap_put(u
->manager
->units
, s
, u
);
263 (void) set_remove(u
->names
, s
);
267 if (u
->type
== _UNIT_TYPE_INVALID
) {
272 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
281 unit_add_to_dbus_queue(u
);
285 int unit_choose_id(Unit
*u
, const char *name
) {
286 _cleanup_free_
char *t
= NULL
;
293 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
298 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
305 /* Selects one of the names of this unit as the id */
306 s
= set_get(u
->names
, (char*) name
);
310 /* Determine the new instance from the new id */
311 r
= unit_name_to_instance(s
, &i
);
320 unit_add_to_dbus_queue(u
);
325 int unit_set_description(Unit
*u
, const char *description
) {
330 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
334 unit_add_to_dbus_queue(u
);
339 bool unit_check_gc(Unit
*u
) {
340 UnitActiveState state
;
345 /* Checks whether the unit is ready to be unloaded for garbage collection. Returns true, when the unit shall
346 * stay around, false if there's no reason to keep it loaded. */
354 state
= unit_active_state(u
);
356 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
357 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
358 UNIT_VTABLE(u
)->release_resources
)
359 UNIT_VTABLE(u
)->release_resources(u
);
367 if (sd_bus_track_count(u
->bus_track
) > 0)
370 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
371 switch (u
->collect_mode
) {
373 case COLLECT_INACTIVE
:
374 if (state
!= UNIT_INACTIVE
)
379 case COLLECT_INACTIVE_OR_FAILED
:
380 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
386 assert_not_reached("Unknown garbage collection mode");
389 if (u
->cgroup_path
) {
390 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
391 * around. Units with active processes should never be collected. */
393 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
395 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
400 if (UNIT_VTABLE(u
)->check_gc
)
401 if (UNIT_VTABLE(u
)->check_gc(u
))
407 void unit_add_to_load_queue(Unit
*u
) {
409 assert(u
->type
!= _UNIT_TYPE_INVALID
);
411 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
414 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
415 u
->in_load_queue
= true;
418 void unit_add_to_cleanup_queue(Unit
*u
) {
421 if (u
->in_cleanup_queue
)
424 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
425 u
->in_cleanup_queue
= true;
428 void unit_add_to_gc_queue(Unit
*u
) {
431 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
434 if (unit_check_gc(u
))
437 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
438 u
->in_gc_queue
= true;
441 void unit_add_to_dbus_queue(Unit
*u
) {
443 assert(u
->type
!= _UNIT_TYPE_INVALID
);
445 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
448 /* Shortcut things if nobody cares */
449 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
450 sd_bus_track_count(u
->bus_track
) <= 0 &&
451 set_isempty(u
->manager
->private_buses
)) {
452 u
->sent_dbus_new_signal
= true;
456 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
457 u
->in_dbus_queue
= true;
460 static void bidi_set_free(Unit
*u
, Hashmap
*h
) {
467 /* Frees the hashmap and makes sure we are dropped from the inverse pointers */
469 HASHMAP_FOREACH_KEY(v
, other
, h
, i
) {
472 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
473 hashmap_remove(other
->dependencies
[d
], u
);
475 unit_add_to_gc_queue(other
);
481 static void unit_remove_transient(Unit
*u
) {
489 if (u
->fragment_path
)
490 (void) unlink(u
->fragment_path
);
492 STRV_FOREACH(i
, u
->dropin_paths
) {
493 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
495 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
499 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
503 /* Only drop transient drop-ins */
504 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
512 static void unit_free_requires_mounts_for(Unit
*u
) {
516 _cleanup_free_
char *path
;
518 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
522 char s
[strlen(path
) + 1];
524 PATH_FOREACH_PREFIX_MORE(s
, path
) {
528 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
532 (void) set_remove(x
, u
);
534 if (set_isempty(x
)) {
535 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
543 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
546 static void unit_done(Unit
*u
) {
555 if (UNIT_VTABLE(u
)->done
)
556 UNIT_VTABLE(u
)->done(u
);
558 ec
= unit_get_exec_context(u
);
560 exec_context_done(ec
);
562 cc
= unit_get_cgroup_context(u
);
564 cgroup_context_done(cc
);
567 void unit_free(Unit
*u
) {
575 u
->transient_file
= safe_fclose(u
->transient_file
);
577 if (!MANAGER_IS_RELOADING(u
->manager
))
578 unit_remove_transient(u
);
580 bus_unit_send_removed_signal(u
);
584 sd_bus_slot_unref(u
->match_bus_slot
);
586 sd_bus_track_unref(u
->bus_track
);
587 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
589 unit_free_requires_mounts_for(u
);
591 SET_FOREACH(t
, u
->names
, i
)
592 hashmap_remove_value(u
->manager
->units
, t
, u
);
594 if (!sd_id128_is_null(u
->invocation_id
))
595 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
609 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
610 bidi_set_free(u
, u
->dependencies
[d
]);
612 if (u
->type
!= _UNIT_TYPE_INVALID
)
613 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
615 if (u
->in_load_queue
)
616 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
618 if (u
->in_dbus_queue
)
619 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
621 if (u
->in_cleanup_queue
)
622 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
625 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
627 if (u
->in_cgroup_realize_queue
)
628 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
630 if (u
->in_cgroup_empty_queue
)
631 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
633 unit_release_cgroup(u
);
635 if (!MANAGER_IS_RELOADING(u
->manager
))
636 unit_unlink_state_files(u
);
638 unit_unref_uid_gid(u
, false);
640 (void) manager_update_failed_units(u
->manager
, u
, false);
641 set_remove(u
->manager
->startup_units
, u
);
643 free(u
->description
);
644 strv_free(u
->documentation
);
645 free(u
->fragment_path
);
646 free(u
->source_path
);
647 strv_free(u
->dropin_paths
);
650 free(u
->job_timeout_reboot_arg
);
652 set_free_free(u
->names
);
654 unit_unwatch_all_pids(u
);
656 condition_free_list(u
->conditions
);
657 condition_free_list(u
->asserts
);
661 unit_ref_unset(&u
->slice
);
664 unit_ref_unset(u
->refs
);
666 safe_close(u
->ip_accounting_ingress_map_fd
);
667 safe_close(u
->ip_accounting_egress_map_fd
);
669 safe_close(u
->ipv4_allow_map_fd
);
670 safe_close(u
->ipv6_allow_map_fd
);
671 safe_close(u
->ipv4_deny_map_fd
);
672 safe_close(u
->ipv6_deny_map_fd
);
674 bpf_program_unref(u
->ip_bpf_ingress
);
675 bpf_program_unref(u
->ip_bpf_egress
);
680 UnitActiveState
unit_active_state(Unit
*u
) {
683 if (u
->load_state
== UNIT_MERGED
)
684 return unit_active_state(unit_follow_merge(u
));
686 /* After a reload it might happen that a unit is not correctly
687 * loaded but still has a process around. That's why we won't
688 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
690 return UNIT_VTABLE(u
)->active_state(u
);
693 const char* unit_sub_state_to_string(Unit
*u
) {
696 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
699 static int set_complete_move(Set
**s
, Set
**other
) {
707 return set_move(*s
, *other
);
716 static int hashmap_complete_move(Hashmap
**s
, Hashmap
**other
) {
724 return hashmap_move(*s
, *other
);
733 static int merge_names(Unit
*u
, Unit
*other
) {
741 r
= set_complete_move(&u
->names
, &other
->names
);
745 set_free_free(other
->names
);
749 SET_FOREACH(t
, u
->names
, i
)
750 assert_se(hashmap_replace(u
->manager
->units
, t
, u
) == 0);
755 static int reserve_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
760 assert(d
< _UNIT_DEPENDENCY_MAX
);
763 * If u does not have this dependency set allocated, there is no need
764 * to reserve anything. In that case other's set will be transferred
765 * as a whole to u by complete_move().
767 if (!u
->dependencies
[d
])
770 /* merge_dependencies() will skip a u-on-u dependency */
771 n_reserve
= hashmap_size(other
->dependencies
[d
]) - !!hashmap_get(other
->dependencies
[d
], u
);
773 return hashmap_reserve(u
->dependencies
[d
], n_reserve
);
776 static void merge_dependencies(Unit
*u
, Unit
*other
, const char *other_id
, UnitDependency d
) {
782 /* Merges all dependencies of type 'd' of the unit 'other' into the deps of the unit 'u' */
786 assert(d
< _UNIT_DEPENDENCY_MAX
);
788 /* Fix backwards pointers. Let's iterate through all dependendent units of the other unit. */
789 HASHMAP_FOREACH_KEY(v
, back
, other
->dependencies
[d
], i
) {
792 /* Let's now iterate through the dependencies of that dependencies of the other units, looking for
793 * pointers back, and let's fix them up, to instead point to 'u'. */
795 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++) {
797 /* Do not add dependencies between u and itself. */
798 if (hashmap_remove(back
->dependencies
[k
], other
))
799 maybe_warn_about_dependency(u
, other_id
, k
);
801 UnitDependencyInfo di_u
, di_other
, di_merged
;
803 /* Let's drop this dependency between "back" and "other", and let's create it between
804 * "back" and "u" instead. Let's merge the bit masks of the dependency we are moving,
805 * and any such dependency which might already exist */
807 di_other
.data
= hashmap_get(back
->dependencies
[k
], other
);
809 continue; /* dependency isn't set, let's try the next one */
811 di_u
.data
= hashmap_get(back
->dependencies
[k
], u
);
813 di_merged
= (UnitDependencyInfo
) {
814 .origin_mask
= di_u
.origin_mask
| di_other
.origin_mask
,
815 .destination_mask
= di_u
.destination_mask
| di_other
.destination_mask
,
818 r
= hashmap_remove_and_replace(back
->dependencies
[k
], other
, u
, di_merged
.data
);
820 log_warning_errno(r
, "Failed to remove/replace: back=%s other=%s u=%s: %m", back
->id
, other_id
, u
->id
);
823 /* assert_se(hashmap_remove_and_replace(back->dependencies[k], other, u, di_merged.data) >= 0); */
829 /* Also do not move dependencies on u to itself */
830 back
= hashmap_remove(other
->dependencies
[d
], u
);
832 maybe_warn_about_dependency(u
, other_id
, d
);
834 /* The move cannot fail. The caller must have performed a reservation. */
835 assert_se(hashmap_complete_move(&u
->dependencies
[d
], &other
->dependencies
[d
]) == 0);
837 other
->dependencies
[d
] = hashmap_free(other
->dependencies
[d
]);
840 int unit_merge(Unit
*u
, Unit
*other
) {
842 const char *other_id
= NULL
;
847 assert(u
->manager
== other
->manager
);
848 assert(u
->type
!= _UNIT_TYPE_INVALID
);
850 other
= unit_follow_merge(other
);
855 if (u
->type
!= other
->type
)
858 if (!u
->instance
!= !other
->instance
)
861 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
864 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
873 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
877 other_id
= strdupa(other
->id
);
879 /* Make reservations to ensure merge_dependencies() won't fail */
880 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
881 r
= reserve_dependencies(u
, other
, d
);
883 * We don't rollback reservations if we fail. We don't have
884 * a way to undo reservations. A reservation is not a leak.
891 r
= merge_names(u
, other
);
895 /* Redirect all references */
897 unit_ref_set(other
->refs
, u
);
899 /* Merge dependencies */
900 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
901 merge_dependencies(u
, other
, other_id
, d
);
903 other
->load_state
= UNIT_MERGED
;
904 other
->merged_into
= u
;
906 /* If there is still some data attached to the other node, we
907 * don't need it anymore, and can free it. */
908 if (other
->load_state
!= UNIT_STUB
)
909 if (UNIT_VTABLE(other
)->done
)
910 UNIT_VTABLE(other
)->done(other
);
912 unit_add_to_dbus_queue(u
);
913 unit_add_to_cleanup_queue(other
);
918 int unit_merge_by_name(Unit
*u
, const char *name
) {
919 _cleanup_free_
char *s
= NULL
;
926 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
930 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
937 other
= manager_get_unit(u
->manager
, name
);
939 return unit_merge(u
, other
);
941 return unit_add_name(u
, name
);
944 Unit
* unit_follow_merge(Unit
*u
) {
947 while (u
->load_state
== UNIT_MERGED
)
948 assert_se(u
= u
->merged_into
);
953 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
954 ExecDirectoryType dt
;
961 if (c
->working_directory
) {
962 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
967 if (c
->root_directory
) {
968 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
974 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
979 for (dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
980 if (!u
->manager
->prefix
[dt
])
983 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
984 _cleanup_free_
char *p
;
986 p
= strjoin(u
->manager
->prefix
[dt
], "/", *dp
);
990 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
996 if (!MANAGER_IS_SYSTEM(u
->manager
))
999 if (c
->private_tmp
) {
1002 FOREACH_STRING(p
, "/tmp", "/var/tmp") {
1003 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1008 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, NULL
, true, UNIT_DEPENDENCY_FILE
);
1013 if (!IN_SET(c
->std_output
,
1014 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1015 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1016 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
) &&
1017 !IN_SET(c
->std_error
,
1018 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1019 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1020 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
))
1023 /* If syslog or kernel logging is requested, make sure our own
1024 * logging daemon is run first. */
1026 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, NULL
, true, UNIT_DEPENDENCY_FILE
);
1033 const char *unit_description(Unit
*u
) {
1037 return u
->description
;
1039 return strna(u
->id
);
1042 static void print_unit_dependency_mask(FILE *f
, const char *kind
, UnitDependencyMask mask
, bool *space
) {
1044 UnitDependencyMask mask
;
1047 { UNIT_DEPENDENCY_FILE
, "file" },
1048 { UNIT_DEPENDENCY_IMPLICIT
, "implicit" },
1049 { UNIT_DEPENDENCY_DEFAULT
, "default" },
1050 { UNIT_DEPENDENCY_UDEV
, "udev" },
1051 { UNIT_DEPENDENCY_PATH
, "path" },
1052 { UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
, "mountinfo-implicit" },
1053 { UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
, "mountinfo-default" },
1054 { UNIT_DEPENDENCY_PROC_SWAP
, "proc-swap" },
1062 for (i
= 0; i
< ELEMENTSOF(table
); i
++) {
1067 if ((mask
& table
[i
].mask
) == table
[i
].mask
) {
1075 fputs(table
[i
].name
, f
);
1077 mask
&= ~table
[i
].mask
;
1084 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
1088 const char *prefix2
;
1090 timestamp0
[FORMAT_TIMESTAMP_MAX
],
1091 timestamp1
[FORMAT_TIMESTAMP_MAX
],
1092 timestamp2
[FORMAT_TIMESTAMP_MAX
],
1093 timestamp3
[FORMAT_TIMESTAMP_MAX
],
1094 timestamp4
[FORMAT_TIMESTAMP_MAX
],
1095 timespan
[FORMAT_TIMESPAN_MAX
];
1097 _cleanup_set_free_ Set
*following_set
= NULL
;
1103 assert(u
->type
>= 0);
1105 prefix
= strempty(prefix
);
1106 prefix2
= strjoina(prefix
, "\t");
1110 "%s\tDescription: %s\n"
1111 "%s\tInstance: %s\n"
1112 "%s\tUnit Load State: %s\n"
1113 "%s\tUnit Active State: %s\n"
1114 "%s\tState Change Timestamp: %s\n"
1115 "%s\tInactive Exit Timestamp: %s\n"
1116 "%s\tActive Enter Timestamp: %s\n"
1117 "%s\tActive Exit Timestamp: %s\n"
1118 "%s\tInactive Enter Timestamp: %s\n"
1119 "%s\tGC Check Good: %s\n"
1120 "%s\tNeed Daemon Reload: %s\n"
1121 "%s\tTransient: %s\n"
1122 "%s\tPerpetual: %s\n"
1123 "%s\tGarbage Collection Mode: %s\n"
1126 "%s\tCGroup realized: %s\n",
1128 prefix
, unit_description(u
),
1129 prefix
, strna(u
->instance
),
1130 prefix
, unit_load_state_to_string(u
->load_state
),
1131 prefix
, unit_active_state_to_string(unit_active_state(u
)),
1132 prefix
, strna(format_timestamp(timestamp0
, sizeof(timestamp0
), u
->state_change_timestamp
.realtime
)),
1133 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->inactive_exit_timestamp
.realtime
)),
1134 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->active_enter_timestamp
.realtime
)),
1135 prefix
, strna(format_timestamp(timestamp3
, sizeof(timestamp3
), u
->active_exit_timestamp
.realtime
)),
1136 prefix
, strna(format_timestamp(timestamp4
, sizeof(timestamp4
), u
->inactive_enter_timestamp
.realtime
)),
1137 prefix
, yes_no(unit_check_gc(u
)),
1138 prefix
, yes_no(unit_need_daemon_reload(u
)),
1139 prefix
, yes_no(u
->transient
),
1140 prefix
, yes_no(u
->perpetual
),
1141 prefix
, collect_mode_to_string(u
->collect_mode
),
1142 prefix
, strna(unit_slice_name(u
)),
1143 prefix
, strna(u
->cgroup_path
),
1144 prefix
, yes_no(u
->cgroup_realized
));
1146 if (u
->cgroup_realized_mask
!= 0) {
1147 _cleanup_free_
char *s
= NULL
;
1148 (void) cg_mask_to_string(u
->cgroup_realized_mask
, &s
);
1149 fprintf(f
, "%s\tCGroup realized mask: %s\n", prefix
, strnull(s
));
1151 if (u
->cgroup_enabled_mask
!= 0) {
1152 _cleanup_free_
char *s
= NULL
;
1153 (void) cg_mask_to_string(u
->cgroup_enabled_mask
, &s
);
1154 fprintf(f
, "%s\tCGroup enabled mask: %s\n", prefix
, strnull(s
));
1156 m
= unit_get_own_mask(u
);
1158 _cleanup_free_
char *s
= NULL
;
1159 (void) cg_mask_to_string(m
, &s
);
1160 fprintf(f
, "%s\tCGroup own mask: %s\n", prefix
, strnull(s
));
1162 m
= unit_get_members_mask(u
);
1164 _cleanup_free_
char *s
= NULL
;
1165 (void) cg_mask_to_string(m
, &s
);
1166 fprintf(f
, "%s\tCGroup members mask: %s\n", prefix
, strnull(s
));
1169 SET_FOREACH(t
, u
->names
, i
)
1170 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
1172 if (!sd_id128_is_null(u
->invocation_id
))
1173 fprintf(f
, "%s\tInvocation ID: " SD_ID128_FORMAT_STR
"\n",
1174 prefix
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
1176 STRV_FOREACH(j
, u
->documentation
)
1177 fprintf(f
, "%s\tDocumentation: %s\n", prefix
, *j
);
1179 following
= unit_following(u
);
1181 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->id
);
1183 r
= unit_following_set(u
, &following_set
);
1187 SET_FOREACH(other
, following_set
, i
)
1188 fprintf(f
, "%s\tFollowing Set Member: %s\n", prefix
, other
->id
);
1191 if (u
->fragment_path
)
1192 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->fragment_path
);
1195 fprintf(f
, "%s\tSource Path: %s\n", prefix
, u
->source_path
);
1197 STRV_FOREACH(j
, u
->dropin_paths
)
1198 fprintf(f
, "%s\tDropIn Path: %s\n", prefix
, *j
);
1200 if (u
->failure_action
!= EMERGENCY_ACTION_NONE
)
1201 fprintf(f
, "%s\tFailure Action: %s\n", prefix
, emergency_action_to_string(u
->failure_action
));
1202 if (u
->success_action
!= EMERGENCY_ACTION_NONE
)
1203 fprintf(f
, "%s\tSuccess Action: %s\n", prefix
, emergency_action_to_string(u
->success_action
));
1205 if (u
->job_timeout
!= USEC_INFINITY
)
1206 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->job_timeout
, 0));
1208 if (u
->job_timeout_action
!= EMERGENCY_ACTION_NONE
)
1209 fprintf(f
, "%s\tJob Timeout Action: %s\n", prefix
, emergency_action_to_string(u
->job_timeout_action
));
1211 if (u
->job_timeout_reboot_arg
)
1212 fprintf(f
, "%s\tJob Timeout Reboot Argument: %s\n", prefix
, u
->job_timeout_reboot_arg
);
1214 condition_dump_list(u
->conditions
, f
, prefix
, condition_type_to_string
);
1215 condition_dump_list(u
->asserts
, f
, prefix
, assert_type_to_string
);
1217 if (dual_timestamp_is_set(&u
->condition_timestamp
))
1219 "%s\tCondition Timestamp: %s\n"
1220 "%s\tCondition Result: %s\n",
1221 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->condition_timestamp
.realtime
)),
1222 prefix
, yes_no(u
->condition_result
));
1224 if (dual_timestamp_is_set(&u
->assert_timestamp
))
1226 "%s\tAssert Timestamp: %s\n"
1227 "%s\tAssert Result: %s\n",
1228 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->assert_timestamp
.realtime
)),
1229 prefix
, yes_no(u
->assert_result
));
1231 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
1232 UnitDependencyInfo di
;
1235 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
1238 fprintf(f
, "%s\t%s: %s (", prefix
, unit_dependency_to_string(d
), other
->id
);
1240 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1241 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1247 if (!hashmap_isempty(u
->requires_mounts_for
)) {
1248 UnitDependencyInfo di
;
1251 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1254 fprintf(f
, "%s\tRequiresMountsFor: %s (", prefix
, path
);
1256 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1257 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1263 if (u
->load_state
== UNIT_LOADED
) {
1266 "%s\tStopWhenUnneeded: %s\n"
1267 "%s\tRefuseManualStart: %s\n"
1268 "%s\tRefuseManualStop: %s\n"
1269 "%s\tDefaultDependencies: %s\n"
1270 "%s\tOnFailureJobMode: %s\n"
1271 "%s\tIgnoreOnIsolate: %s\n",
1272 prefix
, yes_no(u
->stop_when_unneeded
),
1273 prefix
, yes_no(u
->refuse_manual_start
),
1274 prefix
, yes_no(u
->refuse_manual_stop
),
1275 prefix
, yes_no(u
->default_dependencies
),
1276 prefix
, job_mode_to_string(u
->on_failure_job_mode
),
1277 prefix
, yes_no(u
->ignore_on_isolate
));
1279 if (UNIT_VTABLE(u
)->dump
)
1280 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
1282 } else if (u
->load_state
== UNIT_MERGED
)
1284 "%s\tMerged into: %s\n",
1285 prefix
, u
->merged_into
->id
);
1286 else if (u
->load_state
== UNIT_ERROR
)
1287 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror(-u
->load_error
));
1289 for (n
= sd_bus_track_first(u
->bus_track
); n
; n
= sd_bus_track_next(u
->bus_track
))
1290 fprintf(f
, "%s\tBus Ref: %s\n", prefix
, n
);
1293 job_dump(u
->job
, f
, prefix2
);
1296 job_dump(u
->nop_job
, f
, prefix2
);
1299 /* Common implementation for multiple backends */
1300 int unit_load_fragment_and_dropin(Unit
*u
) {
1305 /* Load a .{service,socket,...} file */
1306 r
= unit_load_fragment(u
);
1310 if (u
->load_state
== UNIT_STUB
)
1313 /* Load drop-in directory data. If u is an alias, we might be reloading the
1314 * target unit needlessly. But we cannot be sure which drops-ins have already
1315 * been loaded and which not, at least without doing complicated book-keeping,
1316 * so let's always reread all drop-ins. */
1317 return unit_load_dropin(unit_follow_merge(u
));
1320 /* Common implementation for multiple backends */
1321 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
1326 /* Same as unit_load_fragment_and_dropin(), but whether
1327 * something can be loaded or not doesn't matter. */
1329 /* Load a .service file */
1330 r
= unit_load_fragment(u
);
1334 if (u
->load_state
== UNIT_STUB
)
1335 u
->load_state
= UNIT_LOADED
;
1337 /* Load drop-in directory data */
1338 return unit_load_dropin(unit_follow_merge(u
));
1341 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1345 if (target
->type
!= UNIT_TARGET
)
1348 /* Only add the dependency if both units are loaded, so that
1349 * that loop check below is reliable */
1350 if (u
->load_state
!= UNIT_LOADED
||
1351 target
->load_state
!= UNIT_LOADED
)
1354 /* If either side wants no automatic dependencies, then let's
1356 if (!u
->default_dependencies
||
1357 !target
->default_dependencies
)
1360 /* Don't create loops */
1361 if (hashmap_get(target
->dependencies
[UNIT_BEFORE
], u
))
1364 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1367 static int unit_add_target_dependencies(Unit
*u
) {
1369 static const UnitDependency deps
[] = {
1381 for (k
= 0; k
< ELEMENTSOF(deps
); k
++) {
1386 HASHMAP_FOREACH_KEY(v
, target
, u
->dependencies
[deps
[k
]], i
) {
1387 r
= unit_add_default_target_dependency(u
, target
);
1396 static int unit_add_slice_dependencies(Unit
*u
) {
1397 UnitDependencyMask mask
;
1400 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1403 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1404 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1406 mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1408 if (UNIT_ISSET(u
->slice
))
1409 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, UNIT_DEREF(u
->slice
), true, mask
);
1411 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1414 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, NULL
, true, mask
);
1417 static int unit_add_mount_dependencies(Unit
*u
) {
1418 UnitDependencyInfo di
;
1425 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1426 char prefix
[strlen(path
) + 1];
1428 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1429 _cleanup_free_
char *p
= NULL
;
1432 r
= unit_name_from_path(prefix
, ".mount", &p
);
1436 m
= manager_get_unit(u
->manager
, p
);
1438 /* Make sure to load the mount unit if
1439 * it exists. If so the dependencies
1440 * on this unit will be added later
1441 * during the loading of the mount
1443 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1449 if (m
->load_state
!= UNIT_LOADED
)
1452 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1456 if (m
->fragment_path
) {
1457 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1467 static int unit_add_startup_units(Unit
*u
) {
1471 c
= unit_get_cgroup_context(u
);
1475 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1476 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1477 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1480 r
= set_ensure_allocated(&u
->manager
->startup_units
, NULL
);
1484 return set_put(u
->manager
->startup_units
, u
);
1487 int unit_load(Unit
*u
) {
1492 if (u
->in_load_queue
) {
1493 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1494 u
->in_load_queue
= false;
1497 if (u
->type
== _UNIT_TYPE_INVALID
)
1500 if (u
->load_state
!= UNIT_STUB
)
1503 if (u
->transient_file
) {
1504 r
= fflush_and_check(u
->transient_file
);
1508 u
->transient_file
= safe_fclose(u
->transient_file
);
1509 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1512 if (UNIT_VTABLE(u
)->load
) {
1513 r
= UNIT_VTABLE(u
)->load(u
);
1518 if (u
->load_state
== UNIT_STUB
) {
1523 if (u
->load_state
== UNIT_LOADED
) {
1525 r
= unit_add_target_dependencies(u
);
1529 r
= unit_add_slice_dependencies(u
);
1533 r
= unit_add_mount_dependencies(u
);
1537 r
= unit_add_startup_units(u
);
1541 if (u
->on_failure_job_mode
== JOB_ISOLATE
&& hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) > 1) {
1542 log_unit_error(u
, "More than one OnFailure= dependencies specified but OnFailureJobMode=isolate set. Refusing.");
1547 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1548 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1550 unit_update_cgroup_members_masks(u
);
1553 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1555 unit_add_to_dbus_queue(unit_follow_merge(u
));
1556 unit_add_to_gc_queue(u
);
1561 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
: UNIT_ERROR
;
1563 unit_add_to_dbus_queue(u
);
1564 unit_add_to_gc_queue(u
);
1566 log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1571 static bool unit_condition_test_list(Unit
*u
, Condition
*first
, const char *(*to_string
)(ConditionType t
)) {
1578 /* If the condition list is empty, then it is true */
1582 /* Otherwise, if all of the non-trigger conditions apply and
1583 * if any of the trigger conditions apply (unless there are
1584 * none) we return true */
1585 LIST_FOREACH(conditions
, c
, first
) {
1588 r
= condition_test(c
);
1591 "Couldn't determine result for %s=%s%s%s, assuming failed: %m",
1593 c
->trigger
? "|" : "",
1594 c
->negate
? "!" : "",
1600 c
->trigger
? "|" : "",
1601 c
->negate
? "!" : "",
1603 condition_result_to_string(c
->result
));
1605 if (!c
->trigger
&& r
<= 0)
1608 if (c
->trigger
&& triggered
<= 0)
1612 return triggered
!= 0;
1615 static bool unit_condition_test(Unit
*u
) {
1618 dual_timestamp_get(&u
->condition_timestamp
);
1619 u
->condition_result
= unit_condition_test_list(u
, u
->conditions
, condition_type_to_string
);
1621 return u
->condition_result
;
1624 static bool unit_assert_test(Unit
*u
) {
1627 dual_timestamp_get(&u
->assert_timestamp
);
1628 u
->assert_result
= unit_condition_test_list(u
, u
->asserts
, assert_type_to_string
);
1630 return u
->assert_result
;
1633 void unit_status_printf(Unit
*u
, const char *status
, const char *unit_status_msg_format
) {
1634 DISABLE_WARNING_FORMAT_NONLITERAL
;
1635 manager_status_printf(u
->manager
, STATUS_TYPE_NORMAL
, status
, unit_status_msg_format
, unit_description(u
));
1639 _pure_
static const char* unit_get_status_message_format(Unit
*u
, JobType t
) {
1641 const UnitStatusMessageFormats
*format_table
;
1644 assert(IN_SET(t
, JOB_START
, JOB_STOP
, JOB_RELOAD
));
1646 if (t
!= JOB_RELOAD
) {
1647 format_table
= &UNIT_VTABLE(u
)->status_message_formats
;
1649 format
= format_table
->starting_stopping
[t
== JOB_STOP
];
1655 /* Return generic strings */
1657 return "Starting %s.";
1658 else if (t
== JOB_STOP
)
1659 return "Stopping %s.";
1661 return "Reloading %s.";
1664 static void unit_status_print_starting_stopping(Unit
*u
, JobType t
) {
1669 /* Reload status messages have traditionally not been printed to console. */
1670 if (!IN_SET(t
, JOB_START
, JOB_STOP
))
1673 format
= unit_get_status_message_format(u
, t
);
1675 DISABLE_WARNING_FORMAT_NONLITERAL
;
1676 unit_status_printf(u
, "", format
);
1680 static void unit_status_log_starting_stopping_reloading(Unit
*u
, JobType t
) {
1681 const char *format
, *mid
;
1686 if (!IN_SET(t
, JOB_START
, JOB_STOP
, JOB_RELOAD
))
1689 if (log_on_console())
1692 /* We log status messages for all units and all operations. */
1694 format
= unit_get_status_message_format(u
, t
);
1696 DISABLE_WARNING_FORMAT_NONLITERAL
;
1697 xsprintf(buf
, format
, unit_description(u
));
1700 mid
= t
== JOB_START
? "MESSAGE_ID=" SD_MESSAGE_UNIT_STARTING_STR
:
1701 t
== JOB_STOP
? "MESSAGE_ID=" SD_MESSAGE_UNIT_STOPPING_STR
:
1702 "MESSAGE_ID=" SD_MESSAGE_UNIT_RELOADING_STR
;
1704 /* Note that we deliberately use LOG_MESSAGE() instead of
1705 * LOG_UNIT_MESSAGE() here, since this is supposed to mimic
1706 * closely what is written to screen using the status output,
1707 * which is supposed the highest level, friendliest output
1708 * possible, which means we should avoid the low-level unit
1710 log_struct(LOG_INFO
,
1711 LOG_MESSAGE("%s", buf
),
1713 LOG_UNIT_INVOCATION_ID(u
),
1718 void unit_status_emit_starting_stopping_reloading(Unit
*u
, JobType t
) {
1721 assert(t
< _JOB_TYPE_MAX
);
1723 unit_status_log_starting_stopping_reloading(u
, t
);
1724 unit_status_print_starting_stopping(u
, t
);
1727 int unit_start_limit_test(Unit
*u
) {
1730 if (ratelimit_test(&u
->start_limit
)) {
1731 u
->start_limit_hit
= false;
1735 log_unit_warning(u
, "Start request repeated too quickly.");
1736 u
->start_limit_hit
= true;
1738 return emergency_action(u
->manager
, u
->start_limit_action
, u
->reboot_arg
, "unit failed");
1741 bool unit_shall_confirm_spawn(Unit
*u
) {
1744 if (manager_is_confirm_spawn_disabled(u
->manager
))
1747 /* For some reasons units remaining in the same process group
1748 * as PID 1 fail to acquire the console even if it's not used
1749 * by any process. So skip the confirmation question for them. */
1750 return !unit_get_exec_context(u
)->same_pgrp
;
1753 static bool unit_verify_deps(Unit
*u
) {
1760 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined with
1761 * After=. We do not check Requires= or Requisite= here as they only should have an effect on the job
1762 * processing, but do not have any effect afterwards. We don't check BindsTo= dependencies that are not used in
1763 * conjunction with After= as for them any such check would make things entirely racy. */
1765 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], j
) {
1767 if (!hashmap_contains(u
->dependencies
[UNIT_AFTER
], other
))
1770 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1771 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1780 * -EBADR: This unit type does not support starting.
1781 * -EALREADY: Unit is already started.
1782 * -EAGAIN: An operation is already in progress. Retry later.
1783 * -ECANCELED: Too many requests for now.
1784 * -EPROTO: Assert failed
1785 * -EINVAL: Unit not loaded
1786 * -EOPNOTSUPP: Unit type not supported
1787 * -ENOLINK: The necessary dependencies are not fulfilled.
1789 int unit_start(Unit
*u
) {
1790 UnitActiveState state
;
1795 /* If this is already started, then this will succeed. Note
1796 * that this will even succeed if this unit is not startable
1797 * by the user. This is relied on to detect when we need to
1798 * wait for units and when waiting is finished. */
1799 state
= unit_active_state(u
);
1800 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1803 /* Units that aren't loaded cannot be started */
1804 if (u
->load_state
!= UNIT_LOADED
)
1807 /* If the conditions failed, don't do anything at all. If we
1808 * already are activating this call might still be useful to
1809 * speed up activation in case there is some hold-off time,
1810 * but we don't want to recheck the condition in that case. */
1811 if (state
!= UNIT_ACTIVATING
&&
1812 !unit_condition_test(u
)) {
1813 log_unit_debug(u
, "Starting requested but condition failed. Not starting unit.");
1817 /* If the asserts failed, fail the entire job */
1818 if (state
!= UNIT_ACTIVATING
&&
1819 !unit_assert_test(u
)) {
1820 log_unit_notice(u
, "Starting requested but asserts failed.");
1824 /* Units of types that aren't supported cannot be
1825 * started. Note that we do this test only after the condition
1826 * checks, so that we rather return condition check errors
1827 * (which are usually not considered a true failure) than "not
1828 * supported" errors (which are considered a failure).
1830 if (!unit_supported(u
))
1833 /* Let's make sure that the deps really are in order before we start this. Normally the job engine should have
1834 * taken care of this already, but let's check this here again. After all, our dependencies might not be in
1835 * effect anymore, due to a reload or due to a failed condition. */
1836 if (!unit_verify_deps(u
))
1839 /* Forward to the main object, if we aren't it. */
1840 following
= unit_following(u
);
1842 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1843 return unit_start(following
);
1846 /* If it is stopped, but we cannot start it, then fail */
1847 if (!UNIT_VTABLE(u
)->start
)
1850 /* We don't suppress calls to ->start() here when we are
1851 * already starting, to allow this request to be used as a
1852 * "hurry up" call, for example when the unit is in some "auto
1853 * restart" state where it waits for a holdoff timer to elapse
1854 * before it will start again. */
1856 unit_add_to_dbus_queue(u
);
1858 return UNIT_VTABLE(u
)->start(u
);
1861 bool unit_can_start(Unit
*u
) {
1864 if (u
->load_state
!= UNIT_LOADED
)
1867 if (!unit_supported(u
))
1870 return !!UNIT_VTABLE(u
)->start
;
1873 bool unit_can_isolate(Unit
*u
) {
1876 return unit_can_start(u
) &&
1881 * -EBADR: This unit type does not support stopping.
1882 * -EALREADY: Unit is already stopped.
1883 * -EAGAIN: An operation is already in progress. Retry later.
1885 int unit_stop(Unit
*u
) {
1886 UnitActiveState state
;
1891 state
= unit_active_state(u
);
1892 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1895 following
= unit_following(u
);
1897 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1898 return unit_stop(following
);
1901 if (!UNIT_VTABLE(u
)->stop
)
1904 unit_add_to_dbus_queue(u
);
1906 return UNIT_VTABLE(u
)->stop(u
);
1909 bool unit_can_stop(Unit
*u
) {
1912 if (!unit_supported(u
))
1918 return !!UNIT_VTABLE(u
)->stop
;
1922 * -EBADR: This unit type does not support reloading.
1923 * -ENOEXEC: Unit is not started.
1924 * -EAGAIN: An operation is already in progress. Retry later.
1926 int unit_reload(Unit
*u
) {
1927 UnitActiveState state
;
1932 if (u
->load_state
!= UNIT_LOADED
)
1935 if (!unit_can_reload(u
))
1938 state
= unit_active_state(u
);
1939 if (state
== UNIT_RELOADING
)
1942 if (state
!= UNIT_ACTIVE
) {
1943 log_unit_warning(u
, "Unit cannot be reloaded because it is inactive.");
1947 following
= unit_following(u
);
1949 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1950 return unit_reload(following
);
1953 unit_add_to_dbus_queue(u
);
1955 if (!UNIT_VTABLE(u
)->reload
) {
1956 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
1957 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), true);
1961 return UNIT_VTABLE(u
)->reload(u
);
1964 bool unit_can_reload(Unit
*u
) {
1967 if (UNIT_VTABLE(u
)->can_reload
)
1968 return UNIT_VTABLE(u
)->can_reload(u
);
1970 if (!hashmap_isempty(u
->dependencies
[UNIT_PROPAGATES_RELOAD_TO
]))
1973 return UNIT_VTABLE(u
)->reload
;
1976 static void unit_check_unneeded(Unit
*u
) {
1978 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1980 static const UnitDependency needed_dependencies
[] = {
1992 /* If this service shall be shut down when unneeded then do
1995 if (!u
->stop_when_unneeded
)
1998 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
2001 for (j
= 0; j
< ELEMENTSOF(needed_dependencies
); j
++) {
2006 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[needed_dependencies
[j
]], i
)
2007 if (unit_active_or_pending(other
) || unit_will_restart(other
))
2011 /* If stopping a unit fails continuously we might enter a stop
2012 * loop here, hence stop acting on the service being
2013 * unnecessary after a while. */
2014 if (!ratelimit_test(&u
->auto_stop_ratelimit
)) {
2015 log_unit_warning(u
, "Unit not needed anymore, but not stopping since we tried this too often recently.");
2019 log_unit_info(u
, "Unit not needed anymore. Stopping.");
2021 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
2022 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
2024 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2027 static void unit_check_binds_to(Unit
*u
) {
2028 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2040 if (unit_active_state(u
) != UNIT_ACTIVE
)
2043 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
) {
2047 if (!other
->coldplugged
)
2048 /* We might yet create a job for the other unit… */
2051 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2061 /* If stopping a unit fails continuously we might enter a stop
2062 * loop here, hence stop acting on the service being
2063 * unnecessary after a while. */
2064 if (!ratelimit_test(&u
->auto_stop_ratelimit
)) {
2065 log_unit_warning(u
, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other
->id
);
2070 log_unit_info(u
, "Unit is bound to inactive unit %s. Stopping, too.", other
->id
);
2072 /* A unit we need to run is gone. Sniff. Let's stop this. */
2073 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
2075 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2078 static void retroactively_start_dependencies(Unit
*u
) {
2084 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2086 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], i
)
2087 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2088 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2089 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
2091 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2092 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2093 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2094 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
2096 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
], i
)
2097 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2098 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2099 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
);
2101 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTS
], i
)
2102 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2103 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2105 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTED_BY
], i
)
2106 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2107 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2110 static void retroactively_stop_dependencies(Unit
*u
) {
2116 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2118 /* Pull down units which are bound to us recursively if enabled */
2119 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
2120 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2121 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2124 static void check_unneeded_dependencies(Unit
*u
) {
2130 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2132 /* Garbage collect services that might not be needed anymore, if enabled */
2133 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], i
)
2134 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2135 unit_check_unneeded(other
);
2136 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
], i
)
2137 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2138 unit_check_unneeded(other
);
2139 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUISITE
], i
)
2140 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2141 unit_check_unneeded(other
);
2142 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2143 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2144 unit_check_unneeded(other
);
2147 void unit_start_on_failure(Unit
*u
) {
2154 if (hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
2157 log_unit_info(u
, "Triggering OnFailure= dependencies.");
2159 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_ON_FAILURE
], i
) {
2162 r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_job_mode
, NULL
, NULL
);
2164 log_unit_error_errno(u
, r
, "Failed to enqueue OnFailure= job: %m");
2168 void unit_trigger_notify(Unit
*u
) {
2175 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_TRIGGERED_BY
], i
)
2176 if (UNIT_VTABLE(other
)->trigger_notify
)
2177 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2180 static int unit_log_resources(Unit
*u
) {
2182 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ 4];
2183 size_t n_message_parts
= 0, n_iovec
= 0;
2184 char* message_parts
[3 + 1], *t
;
2185 nsec_t nsec
= NSEC_INFINITY
;
2186 CGroupIPAccountingMetric m
;
2189 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2190 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2191 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2192 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2193 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2198 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2199 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2200 * information and the complete data in structured fields. */
2202 (void) unit_get_cpu_usage(u
, &nsec
);
2203 if (nsec
!= NSEC_INFINITY
) {
2204 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2206 /* Format the CPU time for inclusion in the structured log message */
2207 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2211 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2213 /* Format the CPU time for inclusion in the human language message string */
2214 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2215 t
= strjoin(n_message_parts
> 0 ? "consumed " : "Consumed ", buf
, " CPU time");
2221 message_parts
[n_message_parts
++] = t
;
2224 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2225 char buf
[FORMAT_BYTES_MAX
] = "";
2226 uint64_t value
= UINT64_MAX
;
2228 assert(ip_fields
[m
]);
2230 (void) unit_get_ip_accounting(u
, m
, &value
);
2231 if (value
== UINT64_MAX
)
2234 /* Format IP accounting data for inclusion in the structured log message */
2235 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2239 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2241 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2242 * bytes counters (and not for the packets counters) */
2243 if (m
== CGROUP_IP_INGRESS_BYTES
)
2244 t
= strjoin(n_message_parts
> 0 ? "received " : "Received ",
2245 format_bytes(buf
, sizeof(buf
), value
),
2247 else if (m
== CGROUP_IP_EGRESS_BYTES
)
2248 t
= strjoin(n_message_parts
> 0 ? "sent " : "Sent ",
2249 format_bytes(buf
, sizeof(buf
), value
),
2258 message_parts
[n_message_parts
++] = t
;
2261 /* Is there any accounting data available at all? */
2267 if (n_message_parts
== 0)
2268 t
= strjoina("MESSAGE=", u
->id
, ": Completed");
2270 _cleanup_free_
char *joined
;
2272 message_parts
[n_message_parts
] = NULL
;
2274 joined
= strv_join(message_parts
, ", ");
2280 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
);
2283 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2284 * and hence don't increase n_iovec for them */
2285 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2286 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2288 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2289 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2291 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2292 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2294 log_struct_iovec(LOG_INFO
, iovec
, n_iovec
+ 4);
2298 for (i
= 0; i
< n_message_parts
; i
++)
2299 free(message_parts
[i
]);
2301 for (i
= 0; i
< n_iovec
; i
++)
2302 free(iovec
[i
].iov_base
);
2308 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
2313 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2314 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2316 /* Note that this is called for all low-level state changes,
2317 * even if they might map to the same high-level
2318 * UnitActiveState! That means that ns == os is an expected
2319 * behavior here. For example: if a mount point is remounted
2320 * this function will be called too! */
2324 /* Update timestamps for state changes */
2325 if (!MANAGER_IS_RELOADING(m
)) {
2326 dual_timestamp_get(&u
->state_change_timestamp
);
2328 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2329 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2330 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2331 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2333 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2334 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2335 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2336 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2339 /* Keep track of failed units */
2340 (void) manager_update_failed_units(u
->manager
, u
, ns
== UNIT_FAILED
);
2342 /* Make sure the cgroup and state files are always removed when we become inactive */
2343 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2344 unit_prune_cgroup(u
);
2345 unit_unlink_state_files(u
);
2348 /* Note that this doesn't apply to RemainAfterExit services exiting
2349 * successfully, since there's no change of state in that case. Which is
2350 * why it is handled in service_set_state() */
2351 if (UNIT_IS_INACTIVE_OR_FAILED(os
) != UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2354 ec
= unit_get_exec_context(u
);
2355 if (ec
&& exec_context_may_touch_console(ec
)) {
2356 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2359 if (m
->n_on_console
== 0)
2360 /* unset no_console_output flag, since the console is free */
2361 m
->no_console_output
= false;
2370 if (u
->job
->state
== JOB_WAITING
)
2372 /* So we reached a different state for this
2373 * job. Let's see if we can run it now if it
2374 * failed previously due to EAGAIN. */
2375 job_add_to_run_queue(u
->job
);
2377 /* Let's check whether this state change constitutes a
2378 * finished job, or maybe contradicts a running job and
2379 * hence needs to invalidate jobs. */
2381 switch (u
->job
->type
) {
2384 case JOB_VERIFY_ACTIVE
:
2386 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2387 job_finish_and_invalidate(u
->job
, JOB_DONE
, true, false);
2388 else if (u
->job
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2391 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2392 job_finish_and_invalidate(u
->job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2398 case JOB_RELOAD_OR_START
:
2399 case JOB_TRY_RELOAD
:
2401 if (u
->job
->state
== JOB_RUNNING
) {
2402 if (ns
== UNIT_ACTIVE
)
2403 job_finish_and_invalidate(u
->job
, reload_success
? JOB_DONE
: JOB_FAILED
, true, false);
2404 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2407 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2408 job_finish_and_invalidate(u
->job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2416 case JOB_TRY_RESTART
:
2418 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2419 job_finish_and_invalidate(u
->job
, JOB_DONE
, true, false);
2420 else if (u
->job
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2422 job_finish_and_invalidate(u
->job
, JOB_FAILED
, true, false);
2428 assert_not_reached("Job type unknown");
2434 if (!MANAGER_IS_RELOADING(m
)) {
2436 /* If this state change happened without being
2437 * requested by a job, then let's retroactively start
2438 * or stop dependencies. We skip that step when
2439 * deserializing, since we don't want to create any
2440 * additional jobs just because something is already
2444 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2445 retroactively_start_dependencies(u
);
2446 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2447 retroactively_stop_dependencies(u
);
2450 /* stop unneeded units regardless if going down was expected or not */
2451 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2452 check_unneeded_dependencies(u
);
2454 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2455 log_unit_debug(u
, "Unit entered failed state.");
2456 unit_start_on_failure(u
);
2460 /* Some names are special */
2461 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2463 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
))
2464 /* The bus might have just become available,
2465 * hence try to connect to it, if we aren't
2469 if (u
->type
== UNIT_SERVICE
&&
2470 !UNIT_IS_ACTIVE_OR_RELOADING(os
) &&
2471 !MANAGER_IS_RELOADING(m
)) {
2472 /* Write audit record if we have just finished starting up */
2473 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_START
, true);
2477 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
))
2478 manager_send_unit_plymouth(m
, u
);
2481 /* We don't care about D-Bus going down here, since we'll get an asynchronous notification for it
2484 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) &&
2485 !UNIT_IS_INACTIVE_OR_FAILED(os
)
2486 && !MANAGER_IS_RELOADING(m
)) {
2488 /* This unit just stopped/failed. */
2489 if (u
->type
== UNIT_SERVICE
) {
2491 /* Hmm, if there was no start record written
2492 * write it now, so that we always have a nice
2495 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_START
, ns
== UNIT_INACTIVE
);
2497 if (ns
== UNIT_INACTIVE
)
2498 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_STOP
, true);
2500 /* Write audit record if we have just finished shutting down */
2501 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_STOP
, ns
== UNIT_INACTIVE
);
2503 u
->in_audit
= false;
2506 /* Write a log message about consumed resources */
2507 unit_log_resources(u
);
2511 manager_recheck_journal(m
);
2512 unit_trigger_notify(u
);
2514 if (!MANAGER_IS_RELOADING(u
->manager
)) {
2515 /* Maybe we finished startup and are now ready for
2516 * being stopped because unneeded? */
2517 unit_check_unneeded(u
);
2519 /* Maybe we finished startup, but something we needed
2520 * has vanished? Let's die then. (This happens when
2521 * something BindsTo= to a Type=oneshot unit, as these
2522 * units go directly from starting to inactive,
2523 * without ever entering started.) */
2524 unit_check_binds_to(u
);
2526 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
)
2527 (void) emergency_action(u
->manager
, u
->failure_action
, u
->reboot_arg
, "unit failed");
2528 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
)
2529 (void) emergency_action(u
->manager
, u
->success_action
, u
->reboot_arg
, "unit succeeded");
2532 unit_add_to_dbus_queue(u
);
2533 unit_add_to_gc_queue(u
);
2536 int unit_watch_pid(Unit
*u
, pid_t pid
) {
2542 /* Watch a specific PID. We only support one or two units
2543 * watching each PID for now, not more. */
2545 r
= set_ensure_allocated(&u
->pids
, NULL
);
2549 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids1
, NULL
);
2553 r
= hashmap_put(u
->manager
->watch_pids1
, PID_TO_PTR(pid
), u
);
2555 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids2
, NULL
);
2559 r
= hashmap_put(u
->manager
->watch_pids2
, PID_TO_PTR(pid
), u
);
2562 q
= set_put(u
->pids
, PID_TO_PTR(pid
));
2569 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2573 (void) hashmap_remove_value(u
->manager
->watch_pids1
, PID_TO_PTR(pid
), u
);
2574 (void) hashmap_remove_value(u
->manager
->watch_pids2
, PID_TO_PTR(pid
), u
);
2575 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2578 void unit_unwatch_all_pids(Unit
*u
) {
2581 while (!set_isempty(u
->pids
))
2582 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2584 u
->pids
= set_free(u
->pids
);
2587 void unit_tidy_watch_pids(Unit
*u
, pid_t except1
, pid_t except2
) {
2593 /* Cleans dead PIDs from our list */
2595 SET_FOREACH(e
, u
->pids
, i
) {
2596 pid_t pid
= PTR_TO_PID(e
);
2598 if (pid
== except1
|| pid
== except2
)
2601 if (!pid_is_unwaited(pid
))
2602 unit_unwatch_pid(u
, pid
);
2606 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2608 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2612 case JOB_VERIFY_ACTIVE
:
2615 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2616 * startable by us but may appear due to external events, and it thus makes sense to permit enqueing
2621 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2622 * external events), hence it makes no sense to permit enqueing such a request either. */
2623 return !u
->perpetual
;
2626 case JOB_TRY_RESTART
:
2627 return unit_can_stop(u
) && unit_can_start(u
);
2630 case JOB_TRY_RELOAD
:
2631 return unit_can_reload(u
);
2633 case JOB_RELOAD_OR_START
:
2634 return unit_can_reload(u
) && unit_can_start(u
);
2637 assert_not_reached("Invalid job type");
2641 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
) {
2644 /* Only warn about some unit types */
2645 if (!IN_SET(dependency
, UNIT_CONFLICTS
, UNIT_CONFLICTED_BY
, UNIT_BEFORE
, UNIT_AFTER
, UNIT_ON_FAILURE
, UNIT_TRIGGERS
, UNIT_TRIGGERED_BY
))
2648 if (streq_ptr(u
->id
, other
))
2649 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
2651 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other
), u
->id
);
2654 static int unit_add_dependency_hashmap(
2657 UnitDependencyMask origin_mask
,
2658 UnitDependencyMask destination_mask
) {
2660 UnitDependencyInfo info
;
2665 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2666 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2667 assert(origin_mask
> 0 || destination_mask
> 0);
2669 r
= hashmap_ensure_allocated(h
, NULL
);
2673 assert_cc(sizeof(void*) == sizeof(info
));
2675 info
.data
= hashmap_get(*h
, other
);
2677 /* Entry already exists. Add in our mask. */
2679 if ((info
.origin_mask
& origin_mask
) == info
.origin_mask
&&
2680 (info
.destination_mask
& destination_mask
) == info
.destination_mask
)
2683 info
.origin_mask
|= origin_mask
;
2684 info
.destination_mask
|= destination_mask
;
2686 r
= hashmap_update(*h
, other
, info
.data
);
2688 info
= (UnitDependencyInfo
) {
2689 .origin_mask
= origin_mask
,
2690 .destination_mask
= destination_mask
,
2693 r
= hashmap_put(*h
, other
, info
.data
);
2701 int unit_add_dependency(
2706 UnitDependencyMask mask
) {
2708 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2709 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2710 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2711 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2712 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2713 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2714 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
2715 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
2716 [UNIT_WANTED_BY
] = UNIT_WANTS
,
2717 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
2718 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
2719 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
2720 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
2721 [UNIT_BEFORE
] = UNIT_AFTER
,
2722 [UNIT_AFTER
] = UNIT_BEFORE
,
2723 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
2724 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
2725 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
2726 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
2727 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
2728 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
2729 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
2730 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
,
2732 Unit
*original_u
= u
, *original_other
= other
;
2736 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
2739 u
= unit_follow_merge(u
);
2740 other
= unit_follow_merge(other
);
2742 /* We won't allow dependencies on ourselves. We will not
2743 * consider them an error however. */
2745 maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
2749 if ((d
== UNIT_BEFORE
&& other
->type
== UNIT_DEVICE
) ||
2750 (d
== UNIT_AFTER
&& u
->type
== UNIT_DEVICE
)) {
2751 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
2755 r
= unit_add_dependency_hashmap(u
->dependencies
+ d
, other
, mask
, 0);
2759 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
2760 r
= unit_add_dependency_hashmap(other
->dependencies
+ inverse_table
[d
], u
, 0, mask
);
2765 if (add_reference
) {
2766 r
= unit_add_dependency_hashmap(u
->dependencies
+ UNIT_REFERENCES
, other
, mask
, 0);
2770 r
= unit_add_dependency_hashmap(other
->dependencies
+ UNIT_REFERENCED_BY
, u
, 0, mask
);
2775 unit_add_to_dbus_queue(u
);
2779 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
2784 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2788 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
2791 static int resolve_template(Unit
*u
, const char *name
, const char*path
, char **buf
, const char **ret
) {
2795 assert(name
|| path
);
2800 name
= basename(path
);
2802 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
2809 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
2811 _cleanup_free_
char *i
= NULL
;
2813 r
= unit_name_to_prefix(u
->id
, &i
);
2817 r
= unit_name_replace_instance(name
, i
, buf
);
2826 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
, UnitDependencyMask mask
) {
2827 _cleanup_free_
char *buf
= NULL
;
2832 assert(name
|| path
);
2834 r
= resolve_template(u
, name
, path
, &buf
, &name
);
2838 r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
);
2842 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2845 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
, UnitDependencyMask mask
) {
2846 _cleanup_free_
char *buf
= NULL
;
2851 assert(name
|| path
);
2853 r
= resolve_template(u
, name
, path
, &buf
, &name
);
2857 r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
);
2861 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
2864 int set_unit_path(const char *p
) {
2865 /* This is mostly for debug purposes */
2866 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
2872 char *unit_dbus_path(Unit
*u
) {
2878 return unit_dbus_path_from_name(u
->id
);
2881 char *unit_dbus_path_invocation_id(Unit
*u
) {
2884 if (sd_id128_is_null(u
->invocation_id
))
2887 return unit_dbus_path_from_name(u
->invocation_id_string
);
2890 int unit_set_slice(Unit
*u
, Unit
*slice
) {
2894 /* Sets the unit slice if it has not been set before. Is extra
2895 * careful, to only allow this for units that actually have a
2896 * cgroup context. Also, we don't allow to set this for slices
2897 * (since the parent slice is derived from the name). Make
2898 * sure the unit we set is actually a slice. */
2900 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2903 if (u
->type
== UNIT_SLICE
)
2906 if (unit_active_state(u
) != UNIT_INACTIVE
)
2909 if (slice
->type
!= UNIT_SLICE
)
2912 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
2913 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
2916 if (UNIT_DEREF(u
->slice
) == slice
)
2919 /* Disallow slice changes if @u is already bound to cgroups */
2920 if (UNIT_ISSET(u
->slice
) && u
->cgroup_realized
)
2923 unit_ref_unset(&u
->slice
);
2924 unit_ref_set(&u
->slice
, slice
);
2928 int unit_set_default_slice(Unit
*u
) {
2929 _cleanup_free_
char *b
= NULL
;
2930 const char *slice_name
;
2936 if (UNIT_ISSET(u
->slice
))
2940 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
2942 /* Implicitly place all instantiated units in their
2943 * own per-template slice */
2945 r
= unit_name_to_prefix(u
->id
, &prefix
);
2949 /* The prefix is already escaped, but it might include
2950 * "-" which has a special meaning for slice units,
2951 * hence escape it here extra. */
2952 escaped
= unit_name_escape(prefix
);
2956 if (MANAGER_IS_SYSTEM(u
->manager
))
2957 b
= strjoin("system-", escaped
, ".slice");
2959 b
= strappend(escaped
, ".slice");
2966 MANAGER_IS_SYSTEM(u
->manager
) && !unit_has_name(u
, SPECIAL_INIT_SCOPE
)
2967 ? SPECIAL_SYSTEM_SLICE
2968 : SPECIAL_ROOT_SLICE
;
2970 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
2974 return unit_set_slice(u
, slice
);
2977 const char *unit_slice_name(Unit
*u
) {
2980 if (!UNIT_ISSET(u
->slice
))
2983 return UNIT_DEREF(u
->slice
)->id
;
2986 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
2987 _cleanup_free_
char *t
= NULL
;
2994 r
= unit_name_change_suffix(u
->id
, type
, &t
);
2997 if (unit_has_name(u
, t
))
3000 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3001 assert(r
< 0 || *_found
!= u
);
3005 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3006 const char *name
, *old_owner
, *new_owner
;
3013 r
= sd_bus_message_read(message
, "sss", &name
, &old_owner
, &new_owner
);
3015 bus_log_parse_error(r
);
3019 old_owner
= empty_to_null(old_owner
);
3020 new_owner
= empty_to_null(new_owner
);
3022 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3023 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
3028 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3035 if (u
->match_bus_slot
)
3038 match
= strjoina("type='signal',"
3039 "sender='org.freedesktop.DBus',"
3040 "path='/org/freedesktop/DBus',"
3041 "interface='org.freedesktop.DBus',"
3042 "member='NameOwnerChanged',"
3043 "arg0='", name
, "'");
3045 return sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3048 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3054 /* Watch a specific name on the bus. We only support one unit
3055 * watching each name for now. */
3057 if (u
->manager
->api_bus
) {
3058 /* If the bus is already available, install the match directly.
3059 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3060 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3062 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3065 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3067 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3068 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3074 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3078 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3079 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3082 bool unit_can_serialize(Unit
*u
) {
3085 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
3088 static int unit_serialize_cgroup_mask(FILE *f
, const char *key
, CGroupMask mask
) {
3089 _cleanup_free_
char *s
= NULL
;
3096 r
= cg_mask_to_string(mask
, &s
);
3107 static const char *ip_accounting_metric_field
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
3108 [CGROUP_IP_INGRESS_BYTES
] = "ip-accounting-ingress-bytes",
3109 [CGROUP_IP_INGRESS_PACKETS
] = "ip-accounting-ingress-packets",
3110 [CGROUP_IP_EGRESS_BYTES
] = "ip-accounting-egress-bytes",
3111 [CGROUP_IP_EGRESS_PACKETS
] = "ip-accounting-egress-packets",
3114 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
, bool serialize_jobs
) {
3115 CGroupIPAccountingMetric m
;
3122 if (unit_can_serialize(u
)) {
3125 r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
);
3129 rt
= unit_get_exec_runtime(u
);
3131 r
= exec_runtime_serialize(u
, rt
, f
, fds
);
3137 dual_timestamp_serialize(f
, "state-change-timestamp", &u
->state_change_timestamp
);
3139 dual_timestamp_serialize(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
3140 dual_timestamp_serialize(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
3141 dual_timestamp_serialize(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
3142 dual_timestamp_serialize(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
3144 dual_timestamp_serialize(f
, "condition-timestamp", &u
->condition_timestamp
);
3145 dual_timestamp_serialize(f
, "assert-timestamp", &u
->assert_timestamp
);
3147 if (dual_timestamp_is_set(&u
->condition_timestamp
))
3148 unit_serialize_item(u
, f
, "condition-result", yes_no(u
->condition_result
));
3150 if (dual_timestamp_is_set(&u
->assert_timestamp
))
3151 unit_serialize_item(u
, f
, "assert-result", yes_no(u
->assert_result
));
3153 unit_serialize_item(u
, f
, "transient", yes_no(u
->transient
));
3155 unit_serialize_item(u
, f
, "exported-invocation-id", yes_no(u
->exported_invocation_id
));
3156 unit_serialize_item(u
, f
, "exported-log-level-max", yes_no(u
->exported_log_level_max
));
3157 unit_serialize_item(u
, f
, "exported-log-extra-fields", yes_no(u
->exported_log_extra_fields
));
3159 unit_serialize_item_format(u
, f
, "cpu-usage-base", "%" PRIu64
, u
->cpu_usage_base
);
3160 if (u
->cpu_usage_last
!= NSEC_INFINITY
)
3161 unit_serialize_item_format(u
, f
, "cpu-usage-last", "%" PRIu64
, u
->cpu_usage_last
);
3164 unit_serialize_item(u
, f
, "cgroup", u
->cgroup_path
);
3165 unit_serialize_item(u
, f
, "cgroup-realized", yes_no(u
->cgroup_realized
));
3166 (void) unit_serialize_cgroup_mask(f
, "cgroup-realized-mask", u
->cgroup_realized_mask
);
3167 (void) unit_serialize_cgroup_mask(f
, "cgroup-enabled-mask", u
->cgroup_enabled_mask
);
3168 unit_serialize_item_format(u
, f
, "cgroup-bpf-realized", "%i", u
->cgroup_bpf_state
);
3170 if (uid_is_valid(u
->ref_uid
))
3171 unit_serialize_item_format(u
, f
, "ref-uid", UID_FMT
, u
->ref_uid
);
3172 if (gid_is_valid(u
->ref_gid
))
3173 unit_serialize_item_format(u
, f
, "ref-gid", GID_FMT
, u
->ref_gid
);
3175 if (!sd_id128_is_null(u
->invocation_id
))
3176 unit_serialize_item_format(u
, f
, "invocation-id", SD_ID128_FORMAT_STR
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
3178 bus_track_serialize(u
->bus_track
, f
, "ref");
3180 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
3183 r
= unit_get_ip_accounting(u
, m
, &v
);
3185 unit_serialize_item_format(u
, f
, ip_accounting_metric_field
[m
], "%" PRIu64
, v
);
3188 if (serialize_jobs
) {
3190 fprintf(f
, "job\n");
3191 job_serialize(u
->job
, f
);
3195 fprintf(f
, "job\n");
3196 job_serialize(u
->nop_job
, f
);
3205 int unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
3221 int unit_serialize_item_escaped(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
3222 _cleanup_free_
char *c
= NULL
;
3243 int unit_serialize_item_fd(Unit
*u
, FILE *f
, FDSet
*fds
, const char *key
, int fd
) {
3253 copy
= fdset_put_dup(fds
, fd
);
3257 fprintf(f
, "%s=%i\n", key
, copy
);
3261 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *format
, ...) {
3272 va_start(ap
, format
);
3273 vfprintf(f
, format
, ap
);
3279 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
3280 ExecRuntime
**rt
= NULL
;
3288 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
3290 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
3293 char line
[LINE_MAX
], *l
, *v
;
3294 CGroupIPAccountingMetric m
;
3297 if (!fgets(line
, sizeof(line
), f
)) {
3310 k
= strcspn(l
, "=");
3318 if (streq(l
, "job")) {
3320 /* new-style serialized job */
3327 r
= job_deserialize(j
, f
);
3333 r
= hashmap_put(u
->manager
->jobs
, UINT32_TO_PTR(j
->id
), j
);
3339 r
= job_install_deserialized(j
);
3341 hashmap_remove(u
->manager
->jobs
, UINT32_TO_PTR(j
->id
));
3345 } else /* legacy for pre-44 */
3346 log_unit_warning(u
, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v
);
3348 } else if (streq(l
, "state-change-timestamp")) {
3349 dual_timestamp_deserialize(v
, &u
->state_change_timestamp
);
3351 } else if (streq(l
, "inactive-exit-timestamp")) {
3352 dual_timestamp_deserialize(v
, &u
->inactive_exit_timestamp
);
3354 } else if (streq(l
, "active-enter-timestamp")) {
3355 dual_timestamp_deserialize(v
, &u
->active_enter_timestamp
);
3357 } else if (streq(l
, "active-exit-timestamp")) {
3358 dual_timestamp_deserialize(v
, &u
->active_exit_timestamp
);
3360 } else if (streq(l
, "inactive-enter-timestamp")) {
3361 dual_timestamp_deserialize(v
, &u
->inactive_enter_timestamp
);
3363 } else if (streq(l
, "condition-timestamp")) {
3364 dual_timestamp_deserialize(v
, &u
->condition_timestamp
);
3366 } else if (streq(l
, "assert-timestamp")) {
3367 dual_timestamp_deserialize(v
, &u
->assert_timestamp
);
3369 } else if (streq(l
, "condition-result")) {
3371 r
= parse_boolean(v
);
3373 log_unit_debug(u
, "Failed to parse condition result value %s, ignoring.", v
);
3375 u
->condition_result
= r
;
3379 } else if (streq(l
, "assert-result")) {
3381 r
= parse_boolean(v
);
3383 log_unit_debug(u
, "Failed to parse assert result value %s, ignoring.", v
);
3385 u
->assert_result
= r
;
3389 } else if (streq(l
, "transient")) {
3391 r
= parse_boolean(v
);
3393 log_unit_debug(u
, "Failed to parse transient bool %s, ignoring.", v
);
3399 } else if (streq(l
, "exported-invocation-id")) {
3401 r
= parse_boolean(v
);
3403 log_unit_debug(u
, "Failed to parse exported invocation ID bool %s, ignoring.", v
);
3405 u
->exported_invocation_id
= r
;
3409 } else if (streq(l
, "exported-log-level-max")) {
3411 r
= parse_boolean(v
);
3413 log_unit_debug(u
, "Failed to parse exported log level max bool %s, ignoring.", v
);
3415 u
->exported_log_level_max
= r
;
3419 } else if (streq(l
, "exported-log-extra-fields")) {
3421 r
= parse_boolean(v
);
3423 log_unit_debug(u
, "Failed to parse exported log extra fields bool %s, ignoring.", v
);
3425 u
->exported_log_extra_fields
= r
;
3429 } else if (STR_IN_SET(l
, "cpu-usage-base", "cpuacct-usage-base")) {
3431 r
= safe_atou64(v
, &u
->cpu_usage_base
);
3433 log_unit_debug(u
, "Failed to parse CPU usage base %s, ignoring.", v
);
3437 } else if (streq(l
, "cpu-usage-last")) {
3439 r
= safe_atou64(v
, &u
->cpu_usage_last
);
3441 log_unit_debug(u
, "Failed to read CPU usage last %s, ignoring.", v
);
3445 } else if (streq(l
, "cgroup")) {
3447 r
= unit_set_cgroup_path(u
, v
);
3449 log_unit_debug_errno(u
, r
, "Failed to set cgroup path %s, ignoring: %m", v
);
3451 (void) unit_watch_cgroup(u
);
3454 } else if (streq(l
, "cgroup-realized")) {
3457 b
= parse_boolean(v
);
3459 log_unit_debug(u
, "Failed to parse cgroup-realized bool %s, ignoring.", v
);
3461 u
->cgroup_realized
= b
;
3465 } else if (streq(l
, "cgroup-realized-mask")) {
3467 r
= cg_mask_from_string(v
, &u
->cgroup_realized_mask
);
3469 log_unit_debug(u
, "Failed to parse cgroup-realized-mask %s, ignoring.", v
);
3472 } else if (streq(l
, "cgroup-enabled-mask")) {
3474 r
= cg_mask_from_string(v
, &u
->cgroup_enabled_mask
);
3476 log_unit_debug(u
, "Failed to parse cgroup-enabled-mask %s, ignoring.", v
);
3479 } else if (streq(l
, "cgroup-bpf-realized")) {
3482 r
= safe_atoi(v
, &i
);
3484 log_unit_debug(u
, "Failed to parse cgroup BPF state %s, ignoring.", v
);
3486 u
->cgroup_bpf_state
=
3487 i
< 0 ? UNIT_CGROUP_BPF_INVALIDATED
:
3488 i
> 0 ? UNIT_CGROUP_BPF_ON
:
3489 UNIT_CGROUP_BPF_OFF
;
3493 } else if (streq(l
, "ref-uid")) {
3496 r
= parse_uid(v
, &uid
);
3498 log_unit_debug(u
, "Failed to parse referenced UID %s, ignoring.", v
);
3500 unit_ref_uid_gid(u
, uid
, GID_INVALID
);
3504 } else if (streq(l
, "ref-gid")) {
3507 r
= parse_gid(v
, &gid
);
3509 log_unit_debug(u
, "Failed to parse referenced GID %s, ignoring.", v
);
3511 unit_ref_uid_gid(u
, UID_INVALID
, gid
);
3513 } else if (streq(l
, "ref")) {
3515 r
= strv_extend(&u
->deserialized_refs
, v
);
3520 } else if (streq(l
, "invocation-id")) {
3523 r
= sd_id128_from_string(v
, &id
);
3525 log_unit_debug(u
, "Failed to parse invocation id %s, ignoring.", v
);
3527 r
= unit_set_invocation_id(u
, id
);
3529 log_unit_warning_errno(u
, r
, "Failed to set invocation ID for unit: %m");
3535 /* Check if this is an IP accounting metric serialization field */
3536 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++)
3537 if (streq(l
, ip_accounting_metric_field
[m
]))
3539 if (m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
) {
3542 r
= safe_atou64(v
, &c
);
3544 log_unit_debug(u
, "Failed to parse IP accounting value %s, ignoring.", v
);
3546 u
->ip_accounting_extra
[m
] = c
;
3550 if (unit_can_serialize(u
)) {
3552 r
= exec_runtime_deserialize_item(u
, rt
, l
, v
, fds
);
3554 log_unit_warning(u
, "Failed to deserialize runtime parameter '%s', ignoring.", l
);
3558 /* Returns positive if key was handled by the call */
3563 r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
);
3565 log_unit_warning(u
, "Failed to deserialize unit parameter '%s', ignoring.", l
);
3569 /* Versions before 228 did not carry a state change timestamp. In this case, take the current time. This is
3570 * useful, so that timeouts based on this timestamp don't trigger too early, and is in-line with the logic from
3571 * before 228 where the base for timeouts was not persistent across reboots. */
3573 if (!dual_timestamp_is_set(&u
->state_change_timestamp
))
3574 dual_timestamp_get(&u
->state_change_timestamp
);
3576 /* Let's make sure that everything that is deserialized also gets any potential new cgroup settings applied
3577 * after we are done. For that we invalidate anything already realized, so that we can realize it again. */
3578 unit_invalidate_cgroup(u
, _CGROUP_MASK_ALL
);
3579 unit_invalidate_cgroup_bpf(u
);
3584 void unit_deserialize_skip(FILE *f
) {
3587 /* Skip serialized data for this unit. We don't know what it is. */
3590 char line
[LINE_MAX
], *l
;
3592 if (!fgets(line
, sizeof line
, f
))
3605 int unit_add_node_dependency(Unit
*u
, const char *what
, bool wants
, UnitDependency dep
, UnitDependencyMask mask
) {
3607 _cleanup_free_
char *e
= NULL
;
3612 /* Adds in links to the device node that this unit is based on */
3616 if (!is_device_path(what
))
3619 /* When device units aren't supported (such as in a
3620 * container), don't create dependencies on them. */
3621 if (!unit_type_supported(UNIT_DEVICE
))
3624 r
= unit_name_from_path(what
, ".device", &e
);
3628 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3632 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3633 dep
= UNIT_BINDS_TO
;
3635 r
= unit_add_two_dependencies(u
, UNIT_AFTER
,
3636 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3637 device
, true, mask
);
3642 r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false, mask
);
3650 int unit_coldplug(Unit
*u
) {
3656 /* Make sure we don't enter a loop, when coldplugging
3661 u
->coldplugged
= true;
3663 STRV_FOREACH(i
, u
->deserialized_refs
) {
3664 q
= bus_unit_track_add_name(u
, *i
);
3665 if (q
< 0 && r
>= 0)
3668 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3670 if (UNIT_VTABLE(u
)->coldplug
) {
3671 q
= UNIT_VTABLE(u
)->coldplug(u
);
3672 if (q
< 0 && r
>= 0)
3677 q
= job_coldplug(u
->job
);
3678 if (q
< 0 && r
>= 0)
3685 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3691 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3692 * are never out-of-date. */
3693 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3696 if (stat(path
, &st
) < 0)
3697 /* What, cannot access this anymore? */
3701 /* For masked files check if they are still so */
3702 return !null_or_empty(&st
);
3704 /* For non-empty files check the mtime */
3705 return timespec_load(&st
.st_mtim
) > mtime
;
3710 bool unit_need_daemon_reload(Unit
*u
) {
3711 _cleanup_strv_free_
char **t
= NULL
;
3716 /* For unit files, we allow masking… */
3717 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3718 u
->load_state
== UNIT_MASKED
))
3721 /* Source paths should not be masked… */
3722 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3725 if (u
->load_state
== UNIT_LOADED
)
3726 (void) unit_find_dropin_paths(u
, &t
);
3727 if (!strv_equal(u
->dropin_paths
, t
))
3730 /* … any drop-ins that are masked are simply omitted from the list. */
3731 STRV_FOREACH(path
, u
->dropin_paths
)
3732 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3738 void unit_reset_failed(Unit
*u
) {
3741 if (UNIT_VTABLE(u
)->reset_failed
)
3742 UNIT_VTABLE(u
)->reset_failed(u
);
3744 RATELIMIT_RESET(u
->start_limit
);
3745 u
->start_limit_hit
= false;
3748 Unit
*unit_following(Unit
*u
) {
3751 if (UNIT_VTABLE(u
)->following
)
3752 return UNIT_VTABLE(u
)->following(u
);
3757 bool unit_stop_pending(Unit
*u
) {
3760 /* This call does check the current state of the unit. It's
3761 * hence useful to be called from state change calls of the
3762 * unit itself, where the state isn't updated yet. This is
3763 * different from unit_inactive_or_pending() which checks both
3764 * the current state and for a queued job. */
3766 return u
->job
&& u
->job
->type
== JOB_STOP
;
3769 bool unit_inactive_or_pending(Unit
*u
) {
3772 /* Returns true if the unit is inactive or going down */
3774 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3777 if (unit_stop_pending(u
))
3783 bool unit_active_or_pending(Unit
*u
) {
3786 /* Returns true if the unit is active or going up */
3788 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3792 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3798 bool unit_will_restart(Unit
*u
) {
3801 if (!UNIT_VTABLE(u
)->will_restart
)
3804 return UNIT_VTABLE(u
)->will_restart(u
);
3807 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3809 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3810 assert(SIGNAL_VALID(signo
));
3812 if (!UNIT_VTABLE(u
)->kill
)
3815 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3818 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3822 pid_set
= set_new(NULL
);
3826 /* Exclude the main/control pids from being killed via the cgroup */
3828 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3833 if (control_pid
> 0) {
3834 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3846 int unit_kill_common(
3852 sd_bus_error
*error
) {
3855 bool killed
= false;
3857 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3859 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3860 else if (main_pid
== 0)
3861 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3864 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3865 if (control_pid
< 0)
3866 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3867 else if (control_pid
== 0)
3868 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3871 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3872 if (control_pid
> 0) {
3873 if (kill(control_pid
, signo
) < 0)
3879 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3881 if (kill(main_pid
, signo
) < 0)
3887 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3888 _cleanup_set_free_ Set
*pid_set
= NULL
;
3891 /* Exclude the main/control pids from being killed via the cgroup */
3892 pid_set
= unit_pid_set(main_pid
, control_pid
);
3896 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, NULL
, NULL
);
3897 if (q
< 0 && !IN_SET(q
, -EAGAIN
, -ESRCH
, -ENOENT
))
3903 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
))
3909 int unit_following_set(Unit
*u
, Set
**s
) {
3913 if (UNIT_VTABLE(u
)->following_set
)
3914 return UNIT_VTABLE(u
)->following_set(u
, s
);
3920 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3925 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3926 r
= unit_file_get_state(
3927 u
->manager
->unit_file_scope
,
3929 basename(u
->fragment_path
),
3930 &u
->unit_file_state
);
3932 u
->unit_file_state
= UNIT_FILE_BAD
;
3935 return u
->unit_file_state
;
3938 int unit_get_unit_file_preset(Unit
*u
) {
3941 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3942 u
->unit_file_preset
= unit_file_query_preset(
3943 u
->manager
->unit_file_scope
,
3945 basename(u
->fragment_path
));
3947 return u
->unit_file_preset
;
3950 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*u
) {
3955 unit_ref_unset(ref
);
3958 LIST_PREPEND(refs
, u
->refs
, ref
);
3962 void unit_ref_unset(UnitRef
*ref
) {
3968 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
3969 * be unreferenced now. */
3970 unit_add_to_gc_queue(ref
->unit
);
3972 LIST_REMOVE(refs
, ref
->unit
->refs
, ref
);
3976 static int user_from_unit_name(Unit
*u
, char **ret
) {
3978 static const uint8_t hash_key
[] = {
3979 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
3980 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
3983 _cleanup_free_
char *n
= NULL
;
3986 r
= unit_name_to_prefix(u
->id
, &n
);
3990 if (valid_user_group_name(n
)) {
3996 /* If we can't use the unit name as a user name, then let's hash it and use that */
3997 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4003 int unit_patch_contexts(Unit
*u
) {
4011 /* Patch in the manager defaults into the exec and cgroup
4012 * contexts, _after_ the rest of the settings have been
4015 ec
= unit_get_exec_context(u
);
4017 /* This only copies in the ones that need memory */
4018 for (i
= 0; i
< _RLIMIT_MAX
; i
++)
4019 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4020 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4025 if (MANAGER_IS_USER(u
->manager
) &&
4026 !ec
->working_directory
) {
4028 r
= get_home_dir(&ec
->working_directory
);
4032 /* Allow user services to run, even if the
4033 * home directory is missing */
4034 ec
->working_directory_missing_ok
= true;
4037 if (ec
->private_devices
)
4038 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4040 if (ec
->protect_kernel_modules
)
4041 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4043 if (ec
->dynamic_user
) {
4045 r
= user_from_unit_name(u
, &ec
->user
);
4051 ec
->group
= strdup(ec
->user
);
4056 /* If the dynamic user option is on, let's make sure that the unit can't leave its UID/GID
4057 * around in the file system or on IPC objects. Hence enforce a strict sandbox. */
4059 ec
->private_tmp
= true;
4060 ec
->remove_ipc
= true;
4061 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4062 if (ec
->protect_home
== PROTECT_HOME_NO
)
4063 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4067 cc
= unit_get_cgroup_context(u
);
4071 ec
->private_devices
&&
4072 cc
->device_policy
== CGROUP_AUTO
)
4073 cc
->device_policy
= CGROUP_CLOSED
;
4079 ExecContext
*unit_get_exec_context(Unit
*u
) {
4086 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4090 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4093 KillContext
*unit_get_kill_context(Unit
*u
) {
4100 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4104 return (KillContext
*) ((uint8_t*) u
+ offset
);
4107 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4113 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4117 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4120 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4126 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4130 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4133 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4136 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4139 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4140 return u
->manager
->lookup_paths
.transient
;
4142 if (flags
& UNIT_PERSISTENT
)
4143 return u
->manager
->lookup_paths
.persistent_control
;
4145 if (flags
& UNIT_RUNTIME
)
4146 return u
->manager
->lookup_paths
.runtime_control
;
4151 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4157 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4158 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4159 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4160 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4161 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4164 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4165 ret
= specifier_escape(s
);
4172 if (flags
& UNIT_ESCAPE_C
) {
4185 return ret
?: (char*) s
;
4188 return ret
?: strdup(s
);
4191 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4192 _cleanup_free_
char *result
= NULL
;
4193 size_t n
= 0, allocated
= 0;
4196 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4197 * way suitable for ExecStart= stanzas */
4199 STRV_FOREACH(i
, l
) {
4200 _cleanup_free_
char *buf
= NULL
;
4205 p
= unit_escape_setting(*i
, flags
, &buf
);
4209 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4210 if (!GREEDY_REALLOC(result
, allocated
, n
+ a
+ 1))
4224 if (!GREEDY_REALLOC(result
, allocated
, n
+ 1))
4235 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4236 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4237 const char *dir
, *wrapped
;
4244 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4247 data
= unit_escape_setting(data
, flags
, &escaped
);
4251 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4252 * previous section header is the same */
4254 if (flags
& UNIT_PRIVATE
) {
4255 if (!UNIT_VTABLE(u
)->private_section
)
4258 if (!u
->transient_file
|| u
->last_section_private
< 0)
4259 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4260 else if (u
->last_section_private
== 0)
4261 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4263 if (!u
->transient_file
|| u
->last_section_private
< 0)
4264 data
= strjoina("[Unit]\n", data
);
4265 else if (u
->last_section_private
> 0)
4266 data
= strjoina("\n[Unit]\n", data
);
4269 if (u
->transient_file
) {
4270 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4271 * write to the transient unit file. */
4272 fputs(data
, u
->transient_file
);
4274 if (!endswith(data
, "\n"))
4275 fputc('\n', u
->transient_file
);
4277 /* Remember which section we wrote this entry to */
4278 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4282 dir
= unit_drop_in_dir(u
, flags
);
4286 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4287 "# or an equivalent operation. Do not edit.\n",
4291 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4295 (void) mkdir_p_label(p
, 0755);
4296 r
= write_string_file_atomic_label(q
, wrapped
);
4300 r
= strv_push(&u
->dropin_paths
, q
);
4305 strv_uniq(u
->dropin_paths
);
4307 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4312 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4313 _cleanup_free_
char *p
= NULL
;
4321 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4324 va_start(ap
, format
);
4325 r
= vasprintf(&p
, format
, ap
);
4331 return unit_write_setting(u
, flags
, name
, p
);
4334 int unit_make_transient(Unit
*u
) {
4335 _cleanup_free_
char *path
= NULL
;
4340 if (!UNIT_VTABLE(u
)->can_transient
)
4343 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4345 path
= strjoin(u
->manager
->lookup_paths
.transient
, "/", u
->id
);
4349 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4350 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4352 RUN_WITH_UMASK(0022) {
4353 f
= fopen(path
, "we");
4358 safe_fclose(u
->transient_file
);
4359 u
->transient_file
= f
;
4361 free_and_replace(u
->fragment_path
, path
);
4363 u
->source_path
= mfree(u
->source_path
);
4364 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4365 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4367 u
->load_state
= UNIT_STUB
;
4369 u
->transient
= true;
4371 unit_add_to_dbus_queue(u
);
4372 unit_add_to_gc_queue(u
);
4374 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4380 static void log_kill(pid_t pid
, int sig
, void *userdata
) {
4381 _cleanup_free_
char *comm
= NULL
;
4383 (void) get_process_comm(pid
, &comm
);
4385 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4386 only, like for example systemd's own PAM stub process. */
4387 if (comm
&& comm
[0] == '(')
4390 log_unit_notice(userdata
,
4391 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4394 signal_to_string(sig
));
4397 static int operation_to_signal(KillContext
*c
, KillOperation k
) {
4402 case KILL_TERMINATE
:
4403 case KILL_TERMINATE_AND_LOG
:
4404 return c
->kill_signal
;
4413 assert_not_reached("KillOperation unknown");
4417 int unit_kill_context(
4423 bool main_pid_alien
) {
4425 bool wait_for_exit
= false, send_sighup
;
4426 cg_kill_log_func_t log_func
= NULL
;
4432 /* Kill the processes belonging to this unit, in preparation for shutting the unit down.
4433 * Returns > 0 if we killed something worth waiting for, 0 otherwise. */
4435 if (c
->kill_mode
== KILL_NONE
)
4438 sig
= operation_to_signal(c
, k
);
4442 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4445 if (k
!= KILL_TERMINATE
|| IN_SET(sig
, SIGKILL
, SIGABRT
))
4446 log_func
= log_kill
;
4450 log_func(main_pid
, sig
, u
);
4452 r
= kill_and_sigcont(main_pid
, sig
);
4453 if (r
< 0 && r
!= -ESRCH
) {
4454 _cleanup_free_
char *comm
= NULL
;
4455 (void) get_process_comm(main_pid
, &comm
);
4457 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4459 if (!main_pid_alien
)
4460 wait_for_exit
= true;
4462 if (r
!= -ESRCH
&& send_sighup
)
4463 (void) kill(main_pid
, SIGHUP
);
4467 if (control_pid
> 0) {
4469 log_func(control_pid
, sig
, u
);
4471 r
= kill_and_sigcont(control_pid
, sig
);
4472 if (r
< 0 && r
!= -ESRCH
) {
4473 _cleanup_free_
char *comm
= NULL
;
4474 (void) get_process_comm(control_pid
, &comm
);
4476 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4478 wait_for_exit
= true;
4480 if (r
!= -ESRCH
&& send_sighup
)
4481 (void) kill(control_pid
, SIGHUP
);
4485 if (u
->cgroup_path
&&
4486 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4487 _cleanup_set_free_ Set
*pid_set
= NULL
;
4489 /* Exclude the main/control pids from being killed via the cgroup */
4490 pid_set
= unit_pid_set(main_pid
, control_pid
);
4494 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4496 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4500 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4501 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4505 /* FIXME: For now, on the legacy hierarchy, we
4506 * will not wait for the cgroup members to die
4507 * if we are running in a container or if this
4508 * is a delegation unit, simply because cgroup
4509 * notification is unreliable in these
4510 * cases. It doesn't work at all in
4511 * containers, and outside of containers it
4512 * can be confused easily by left-over
4513 * directories in the cgroup — which however
4514 * should not exist in non-delegated units. On
4515 * the unified hierarchy that's different,
4516 * there we get proper events. Hence rely on
4519 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4520 (detect_container() == 0 && !UNIT_CGROUP_BOOL(u
, delegate
)))
4521 wait_for_exit
= true;
4526 pid_set
= unit_pid_set(main_pid
, control_pid
);
4530 cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4539 return wait_for_exit
;
4542 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4543 char prefix
[strlen(path
) + 1], *p
;
4544 UnitDependencyInfo di
;
4550 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these paths in
4551 * the unit (from the path to the UnitDependencyInfo structure indicating how to the dependency came to
4552 * be). However, we build a prefix table for all possible prefixes so that new appearing mount units can easily
4553 * determine which units to make themselves a dependency of. */
4555 if (!path_is_absolute(path
))
4558 r
= hashmap_ensure_allocated(&u
->requires_mounts_for
, &string_hash_ops
);
4566 path_kill_slashes(p
);
4568 if (!path_is_normalized(p
)) {
4573 if (hashmap_contains(u
->requires_mounts_for
, p
)) {
4578 di
= (UnitDependencyInfo
) {
4582 r
= hashmap_put(u
->requires_mounts_for
, p
, di
.data
);
4588 PATH_FOREACH_PREFIX_MORE(prefix
, p
) {
4591 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4595 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &string_hash_ops
);
4609 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4625 int unit_setup_exec_runtime(Unit
*u
) {
4632 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4635 /* Check if there already is an ExecRuntime for this unit? */
4636 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4640 /* Try to get it from somebody else */
4641 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_JOINS_NAMESPACE_OF
], i
) {
4643 *rt
= unit_get_exec_runtime(other
);
4645 exec_runtime_ref(*rt
);
4650 return exec_runtime_make(rt
, unit_get_exec_context(u
), u
->id
);
4653 int unit_setup_dynamic_creds(Unit
*u
) {
4655 DynamicCreds
*dcreds
;
4660 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4662 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4664 ec
= unit_get_exec_context(u
);
4667 if (!ec
->dynamic_user
)
4670 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4673 bool unit_type_supported(UnitType t
) {
4674 if (_unlikely_(t
< 0))
4676 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4679 if (!unit_vtable
[t
]->supported
)
4682 return unit_vtable
[t
]->supported();
4685 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4691 r
= dir_is_empty(where
);
4695 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4699 log_struct(LOG_NOTICE
,
4700 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4702 LOG_UNIT_INVOCATION_ID(u
),
4703 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4708 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4709 _cleanup_free_
char *canonical_where
;
4715 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
);
4717 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4721 /* We will happily ignore a trailing slash (or any redundant slashes) */
4722 if (path_equal(where
, canonical_where
))
4725 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4727 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4729 LOG_UNIT_INVOCATION_ID(u
),
4730 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4737 bool unit_is_pristine(Unit
*u
) {
4740 /* Check if the unit already exists or is already around,
4741 * in a number of different ways. Note that to cater for unit
4742 * types such as slice, we are generally fine with units that
4743 * are marked UNIT_LOADED even though nothing was
4744 * actually loaded, as those unit types don't require a file
4745 * on disk to validly load. */
4747 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4750 !strv_isempty(u
->dropin_paths
) ||
4755 pid_t
unit_control_pid(Unit
*u
) {
4758 if (UNIT_VTABLE(u
)->control_pid
)
4759 return UNIT_VTABLE(u
)->control_pid(u
);
4764 pid_t
unit_main_pid(Unit
*u
) {
4767 if (UNIT_VTABLE(u
)->main_pid
)
4768 return UNIT_VTABLE(u
)->main_pid(u
);
4773 static void unit_unref_uid_internal(
4777 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4781 assert(_manager_unref_uid
);
4783 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4784 * gid_t are actually the same time, with the same validity rules.
4786 * Drops a reference to UID/GID from a unit. */
4788 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4789 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4791 if (!uid_is_valid(*ref_uid
))
4794 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4795 *ref_uid
= UID_INVALID
;
4798 void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4799 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4802 void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4803 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4806 static int unit_ref_uid_internal(
4811 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4817 assert(uid_is_valid(uid
));
4818 assert(_manager_ref_uid
);
4820 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4821 * are actually the same type, and have the same validity rules.
4823 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4824 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4827 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4828 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4830 if (*ref_uid
== uid
)
4833 if (uid_is_valid(*ref_uid
)) /* Already set? */
4836 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4844 int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4845 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4848 int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4849 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4852 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4857 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4859 if (uid_is_valid(uid
)) {
4860 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4865 if (gid_is_valid(gid
)) {
4866 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4869 unit_unref_uid(u
, false);
4875 return r
> 0 || q
> 0;
4878 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4884 c
= unit_get_exec_context(u
);
4886 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4888 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4893 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4896 unit_unref_uid(u
, destroy_now
);
4897 unit_unref_gid(u
, destroy_now
);
4900 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4905 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4906 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4907 * objects when no service references the UID/GID anymore. */
4909 r
= unit_ref_uid_gid(u
, uid
, gid
);
4911 bus_unit_send_change_signal(u
);
4914 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
4919 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
4921 if (sd_id128_equal(u
->invocation_id
, id
))
4924 if (!sd_id128_is_null(u
->invocation_id
))
4925 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4927 if (sd_id128_is_null(id
)) {
4932 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
4936 u
->invocation_id
= id
;
4937 sd_id128_to_string(id
, u
->invocation_id_string
);
4939 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4946 u
->invocation_id
= SD_ID128_NULL
;
4947 u
->invocation_id_string
[0] = 0;
4951 int unit_acquire_invocation_id(Unit
*u
) {
4957 r
= sd_id128_randomize(&id
);
4959 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4961 r
= unit_set_invocation_id(u
, id
);
4963 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
4968 void unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
4972 p
->cgroup_path
= u
->cgroup_path
;
4973 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, UNIT_CGROUP_BOOL(u
, delegate
));
4976 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
4982 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
4983 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
4985 (void) unit_realize_cgroup(u
);
4987 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
4991 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
, -1);
4992 (void) ignore_signals(SIGPIPE
, -1);
4994 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
4996 if (u
->cgroup_path
) {
4997 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
4999 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5007 static void unit_update_dependency_mask(Unit
*u
, UnitDependency d
, Unit
*other
, UnitDependencyInfo di
) {
5010 assert(d
< _UNIT_DEPENDENCY_MAX
);
5013 if (di
.origin_mask
== 0 && di
.destination_mask
== 0) {
5014 /* No bit set anymore, let's drop the whole entry */
5015 assert_se(hashmap_remove(u
->dependencies
[d
], other
));
5016 log_unit_debug(u
, "%s lost dependency %s=%s", u
->id
, unit_dependency_to_string(d
), other
->id
);
5018 /* Mask was reduced, let's update the entry */
5019 assert_se(hashmap_update(u
->dependencies
[d
], other
, di
.data
) == 0);
5022 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5027 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5032 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
5036 UnitDependencyInfo di
;
5042 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
5045 if ((di
.origin_mask
& ~mask
) == di
.origin_mask
)
5047 di
.origin_mask
&= ~mask
;
5048 unit_update_dependency_mask(u
, d
, other
, di
);
5050 /* We updated the dependency from our unit to the other unit now. But most dependencies
5051 * imply a reverse dependency. Hence, let's delete that one too. For that we go through
5052 * all dependency types on the other unit and delete all those which point to us and
5053 * have the right mask set. */
5055 for (q
= 0; q
< _UNIT_DEPENDENCY_MAX
; q
++) {
5056 UnitDependencyInfo dj
;
5058 dj
.data
= hashmap_get(other
->dependencies
[q
], u
);
5059 if ((dj
.destination_mask
& ~mask
) == dj
.destination_mask
)
5061 dj
.destination_mask
&= ~mask
;
5063 unit_update_dependency_mask(other
, q
, u
, dj
);
5066 unit_add_to_gc_queue(other
);
5076 static int unit_export_invocation_id(Unit
*u
) {
5082 if (u
->exported_invocation_id
)
5085 if (sd_id128_is_null(u
->invocation_id
))
5088 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5089 r
= symlink_atomic(u
->invocation_id_string
, p
);
5091 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5093 u
->exported_invocation_id
= true;
5097 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5105 if (u
->exported_log_level_max
)
5108 if (c
->log_level_max
< 0)
5111 assert(c
->log_level_max
<= 7);
5113 buf
[0] = '0' + c
->log_level_max
;
5116 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5117 r
= symlink_atomic(buf
, p
);
5119 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5121 u
->exported_log_level_max
= true;
5125 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5126 _cleanup_close_
int fd
= -1;
5127 struct iovec
*iovec
;
5135 if (u
->exported_log_extra_fields
)
5138 if (c
->n_log_extra_fields
<= 0)
5141 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5142 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5144 for (i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5145 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5147 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5148 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5151 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5152 pattern
= strjoina(p
, ".XXXXXX");
5154 fd
= mkostemp_safe(pattern
);
5156 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5158 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5160 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5164 (void) fchmod(fd
, 0644);
5166 if (rename(pattern
, p
) < 0) {
5167 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5171 u
->exported_log_extra_fields
= true;
5175 (void) unlink(pattern
);
5179 void unit_export_state_files(Unit
*u
) {
5180 const ExecContext
*c
;
5187 if (!MANAGER_IS_SYSTEM(u
->manager
))
5190 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5191 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5192 * the IPC system itself and PID 1 also log to the journal.
5194 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5195 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5196 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5197 * namespace at least.
5199 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5200 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5203 (void) unit_export_invocation_id(u
);
5205 c
= unit_get_exec_context(u
);
5207 (void) unit_export_log_level_max(u
, c
);
5208 (void) unit_export_log_extra_fields(u
, c
);
5212 void unit_unlink_state_files(Unit
*u
) {
5220 if (!MANAGER_IS_SYSTEM(u
->manager
))
5223 /* Undoes the effect of unit_export_state() */
5225 if (u
->exported_invocation_id
) {
5226 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5229 u
->exported_invocation_id
= false;
5232 if (u
->exported_log_level_max
) {
5233 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5236 u
->exported_log_level_max
= false;
5239 if (u
->exported_log_extra_fields
) {
5240 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5243 u
->exported_log_extra_fields
= false;
5247 int unit_prepare_exec(Unit
*u
) {
5252 /* Prepares everything so that we can fork of a process for this unit */
5254 (void) unit_realize_cgroup(u
);
5256 if (u
->reset_accounting
) {
5257 (void) unit_reset_cpu_accounting(u
);
5258 (void) unit_reset_ip_accounting(u
);
5259 u
->reset_accounting
= false;
5262 unit_export_state_files(u
);
5264 r
= unit_setup_exec_runtime(u
);
5268 r
= unit_setup_dynamic_creds(u
);
5275 static void log_leftover(pid_t pid
, int sig
, void *userdata
) {
5276 _cleanup_free_
char *comm
= NULL
;
5278 (void) get_process_comm(pid
, &comm
);
5280 if (comm
&& comm
[0] == '(') /* Most likely our own helper process (PAM?), ignore */
5283 log_unit_warning(userdata
,
5284 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5285 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5289 void unit_warn_leftover_processes(Unit
*u
) {
5292 (void) unit_pick_cgroup_path(u
);
5294 if (!u
->cgroup_path
)
5297 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_leftover
, u
);
5300 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5301 [COLLECT_INACTIVE
] = "inactive",
5302 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5305 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);