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_may_gc(Unit
*u
) {
340 UnitActiveState state
;
345 /* Checks whether the unit is ready to be unloaded for garbage collection.
346 * Returns true when the unit may be collected, and false if there's some
347 * reason to keep it loaded. */
355 state
= unit_active_state(u
);
357 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
358 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
359 UNIT_VTABLE(u
)->release_resources
)
360 UNIT_VTABLE(u
)->release_resources(u
);
368 if (sd_bus_track_count(u
->bus_track
) > 0)
371 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
372 switch (u
->collect_mode
) {
374 case COLLECT_INACTIVE
:
375 if (state
!= UNIT_INACTIVE
)
380 case COLLECT_INACTIVE_OR_FAILED
:
381 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
387 assert_not_reached("Unknown garbage collection mode");
390 if (u
->cgroup_path
) {
391 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
392 * around. Units with active processes should never be collected. */
394 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
396 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
401 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_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
)
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
);
634 manager_unref_console(u
->manager
);
636 unit_release_cgroup(u
);
638 if (!MANAGER_IS_RELOADING(u
->manager
))
639 unit_unlink_state_files(u
);
641 unit_unref_uid_gid(u
, false);
643 (void) manager_update_failed_units(u
->manager
, u
, false);
644 set_remove(u
->manager
->startup_units
, u
);
646 free(u
->description
);
647 strv_free(u
->documentation
);
648 free(u
->fragment_path
);
649 free(u
->source_path
);
650 strv_free(u
->dropin_paths
);
653 free(u
->job_timeout_reboot_arg
);
655 set_free_free(u
->names
);
657 unit_unwatch_all_pids(u
);
659 condition_free_list(u
->conditions
);
660 condition_free_list(u
->asserts
);
664 unit_ref_unset(&u
->slice
);
667 unit_ref_unset(u
->refs
);
669 safe_close(u
->ip_accounting_ingress_map_fd
);
670 safe_close(u
->ip_accounting_egress_map_fd
);
672 safe_close(u
->ipv4_allow_map_fd
);
673 safe_close(u
->ipv6_allow_map_fd
);
674 safe_close(u
->ipv4_deny_map_fd
);
675 safe_close(u
->ipv6_deny_map_fd
);
677 bpf_program_unref(u
->ip_bpf_ingress
);
678 bpf_program_unref(u
->ip_bpf_egress
);
683 UnitActiveState
unit_active_state(Unit
*u
) {
686 if (u
->load_state
== UNIT_MERGED
)
687 return unit_active_state(unit_follow_merge(u
));
689 /* After a reload it might happen that a unit is not correctly
690 * loaded but still has a process around. That's why we won't
691 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
693 return UNIT_VTABLE(u
)->active_state(u
);
696 const char* unit_sub_state_to_string(Unit
*u
) {
699 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
702 static int set_complete_move(Set
**s
, Set
**other
) {
710 return set_move(*s
, *other
);
719 static int hashmap_complete_move(Hashmap
**s
, Hashmap
**other
) {
727 return hashmap_move(*s
, *other
);
736 static int merge_names(Unit
*u
, Unit
*other
) {
744 r
= set_complete_move(&u
->names
, &other
->names
);
748 set_free_free(other
->names
);
752 SET_FOREACH(t
, u
->names
, i
)
753 assert_se(hashmap_replace(u
->manager
->units
, t
, u
) == 0);
758 static int reserve_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
763 assert(d
< _UNIT_DEPENDENCY_MAX
);
766 * If u does not have this dependency set allocated, there is no need
767 * to reserve anything. In that case other's set will be transferred
768 * as a whole to u by complete_move().
770 if (!u
->dependencies
[d
])
773 /* merge_dependencies() will skip a u-on-u dependency */
774 n_reserve
= hashmap_size(other
->dependencies
[d
]) - !!hashmap_get(other
->dependencies
[d
], u
);
776 return hashmap_reserve(u
->dependencies
[d
], n_reserve
);
779 static void merge_dependencies(Unit
*u
, Unit
*other
, const char *other_id
, UnitDependency d
) {
785 /* Merges all dependencies of type 'd' of the unit 'other' into the deps of the unit 'u' */
789 assert(d
< _UNIT_DEPENDENCY_MAX
);
791 /* Fix backwards pointers. Let's iterate through all dependendent units of the other unit. */
792 HASHMAP_FOREACH_KEY(v
, back
, other
->dependencies
[d
], i
) {
795 /* Let's now iterate through the dependencies of that dependencies of the other units, looking for
796 * pointers back, and let's fix them up, to instead point to 'u'. */
798 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++) {
800 /* Do not add dependencies between u and itself. */
801 if (hashmap_remove(back
->dependencies
[k
], other
))
802 maybe_warn_about_dependency(u
, other_id
, k
);
804 UnitDependencyInfo di_u
, di_other
, di_merged
;
806 /* Let's drop this dependency between "back" and "other", and let's create it between
807 * "back" and "u" instead. Let's merge the bit masks of the dependency we are moving,
808 * and any such dependency which might already exist */
810 di_other
.data
= hashmap_get(back
->dependencies
[k
], other
);
812 continue; /* dependency isn't set, let's try the next one */
814 di_u
.data
= hashmap_get(back
->dependencies
[k
], u
);
816 di_merged
= (UnitDependencyInfo
) {
817 .origin_mask
= di_u
.origin_mask
| di_other
.origin_mask
,
818 .destination_mask
= di_u
.destination_mask
| di_other
.destination_mask
,
821 r
= hashmap_remove_and_replace(back
->dependencies
[k
], other
, u
, di_merged
.data
);
823 log_warning_errno(r
, "Failed to remove/replace: back=%s other=%s u=%s: %m", back
->id
, other_id
, u
->id
);
826 /* assert_se(hashmap_remove_and_replace(back->dependencies[k], other, u, di_merged.data) >= 0); */
832 /* Also do not move dependencies on u to itself */
833 back
= hashmap_remove(other
->dependencies
[d
], u
);
835 maybe_warn_about_dependency(u
, other_id
, d
);
837 /* The move cannot fail. The caller must have performed a reservation. */
838 assert_se(hashmap_complete_move(&u
->dependencies
[d
], &other
->dependencies
[d
]) == 0);
840 other
->dependencies
[d
] = hashmap_free(other
->dependencies
[d
]);
843 int unit_merge(Unit
*u
, Unit
*other
) {
845 const char *other_id
= NULL
;
850 assert(u
->manager
== other
->manager
);
851 assert(u
->type
!= _UNIT_TYPE_INVALID
);
853 other
= unit_follow_merge(other
);
858 if (u
->type
!= other
->type
)
861 if (!u
->instance
!= !other
->instance
)
864 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
867 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
876 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
880 other_id
= strdupa(other
->id
);
882 /* Make reservations to ensure merge_dependencies() won't fail */
883 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
884 r
= reserve_dependencies(u
, other
, d
);
886 * We don't rollback reservations if we fail. We don't have
887 * a way to undo reservations. A reservation is not a leak.
894 r
= merge_names(u
, other
);
898 /* Redirect all references */
900 unit_ref_set(other
->refs
, u
);
902 /* Merge dependencies */
903 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
904 merge_dependencies(u
, other
, other_id
, d
);
906 other
->load_state
= UNIT_MERGED
;
907 other
->merged_into
= u
;
909 /* If there is still some data attached to the other node, we
910 * don't need it anymore, and can free it. */
911 if (other
->load_state
!= UNIT_STUB
)
912 if (UNIT_VTABLE(other
)->done
)
913 UNIT_VTABLE(other
)->done(other
);
915 unit_add_to_dbus_queue(u
);
916 unit_add_to_cleanup_queue(other
);
921 int unit_merge_by_name(Unit
*u
, const char *name
) {
922 _cleanup_free_
char *s
= NULL
;
929 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
933 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
940 other
= manager_get_unit(u
->manager
, name
);
942 return unit_merge(u
, other
);
944 return unit_add_name(u
, name
);
947 Unit
* unit_follow_merge(Unit
*u
) {
950 while (u
->load_state
== UNIT_MERGED
)
951 assert_se(u
= u
->merged_into
);
956 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
957 ExecDirectoryType dt
;
964 if (c
->working_directory
) {
965 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
970 if (c
->root_directory
) {
971 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
977 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
982 for (dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
983 if (!u
->manager
->prefix
[dt
])
986 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
987 _cleanup_free_
char *p
;
989 p
= strjoin(u
->manager
->prefix
[dt
], "/", *dp
);
993 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
999 if (!MANAGER_IS_SYSTEM(u
->manager
))
1002 if (c
->private_tmp
) {
1005 FOREACH_STRING(p
, "/tmp", "/var/tmp") {
1006 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1011 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, NULL
, true, UNIT_DEPENDENCY_FILE
);
1016 if (!IN_SET(c
->std_output
,
1017 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1018 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1019 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
) &&
1020 !IN_SET(c
->std_error
,
1021 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1022 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1023 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
))
1026 /* If syslog or kernel logging is requested, make sure our own
1027 * logging daemon is run first. */
1029 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, NULL
, true, UNIT_DEPENDENCY_FILE
);
1036 const char *unit_description(Unit
*u
) {
1040 return u
->description
;
1042 return strna(u
->id
);
1045 static void print_unit_dependency_mask(FILE *f
, const char *kind
, UnitDependencyMask mask
, bool *space
) {
1047 UnitDependencyMask mask
;
1050 { UNIT_DEPENDENCY_FILE
, "file" },
1051 { UNIT_DEPENDENCY_IMPLICIT
, "implicit" },
1052 { UNIT_DEPENDENCY_DEFAULT
, "default" },
1053 { UNIT_DEPENDENCY_UDEV
, "udev" },
1054 { UNIT_DEPENDENCY_PATH
, "path" },
1055 { UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
, "mountinfo-implicit" },
1056 { UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
, "mountinfo-default" },
1057 { UNIT_DEPENDENCY_PROC_SWAP
, "proc-swap" },
1065 for (i
= 0; i
< ELEMENTSOF(table
); i
++) {
1070 if ((mask
& table
[i
].mask
) == table
[i
].mask
) {
1078 fputs(table
[i
].name
, f
);
1080 mask
&= ~table
[i
].mask
;
1087 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
1091 const char *prefix2
;
1093 timestamp0
[FORMAT_TIMESTAMP_MAX
],
1094 timestamp1
[FORMAT_TIMESTAMP_MAX
],
1095 timestamp2
[FORMAT_TIMESTAMP_MAX
],
1096 timestamp3
[FORMAT_TIMESTAMP_MAX
],
1097 timestamp4
[FORMAT_TIMESTAMP_MAX
],
1098 timespan
[FORMAT_TIMESPAN_MAX
];
1100 _cleanup_set_free_ Set
*following_set
= NULL
;
1106 assert(u
->type
>= 0);
1108 prefix
= strempty(prefix
);
1109 prefix2
= strjoina(prefix
, "\t");
1113 "%s\tDescription: %s\n"
1114 "%s\tInstance: %s\n"
1115 "%s\tUnit Load State: %s\n"
1116 "%s\tUnit Active State: %s\n"
1117 "%s\tState Change Timestamp: %s\n"
1118 "%s\tInactive Exit Timestamp: %s\n"
1119 "%s\tActive Enter Timestamp: %s\n"
1120 "%s\tActive Exit Timestamp: %s\n"
1121 "%s\tInactive Enter Timestamp: %s\n"
1123 "%s\tNeed Daemon Reload: %s\n"
1124 "%s\tTransient: %s\n"
1125 "%s\tPerpetual: %s\n"
1126 "%s\tGarbage Collection Mode: %s\n"
1129 "%s\tCGroup realized: %s\n",
1131 prefix
, unit_description(u
),
1132 prefix
, strna(u
->instance
),
1133 prefix
, unit_load_state_to_string(u
->load_state
),
1134 prefix
, unit_active_state_to_string(unit_active_state(u
)),
1135 prefix
, strna(format_timestamp(timestamp0
, sizeof(timestamp0
), u
->state_change_timestamp
.realtime
)),
1136 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->inactive_exit_timestamp
.realtime
)),
1137 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->active_enter_timestamp
.realtime
)),
1138 prefix
, strna(format_timestamp(timestamp3
, sizeof(timestamp3
), u
->active_exit_timestamp
.realtime
)),
1139 prefix
, strna(format_timestamp(timestamp4
, sizeof(timestamp4
), u
->inactive_enter_timestamp
.realtime
)),
1140 prefix
, yes_no(unit_may_gc(u
)),
1141 prefix
, yes_no(unit_need_daemon_reload(u
)),
1142 prefix
, yes_no(u
->transient
),
1143 prefix
, yes_no(u
->perpetual
),
1144 prefix
, collect_mode_to_string(u
->collect_mode
),
1145 prefix
, strna(unit_slice_name(u
)),
1146 prefix
, strna(u
->cgroup_path
),
1147 prefix
, yes_no(u
->cgroup_realized
));
1149 if (u
->cgroup_realized_mask
!= 0) {
1150 _cleanup_free_
char *s
= NULL
;
1151 (void) cg_mask_to_string(u
->cgroup_realized_mask
, &s
);
1152 fprintf(f
, "%s\tCGroup realized mask: %s\n", prefix
, strnull(s
));
1154 if (u
->cgroup_enabled_mask
!= 0) {
1155 _cleanup_free_
char *s
= NULL
;
1156 (void) cg_mask_to_string(u
->cgroup_enabled_mask
, &s
);
1157 fprintf(f
, "%s\tCGroup enabled mask: %s\n", prefix
, strnull(s
));
1159 m
= unit_get_own_mask(u
);
1161 _cleanup_free_
char *s
= NULL
;
1162 (void) cg_mask_to_string(m
, &s
);
1163 fprintf(f
, "%s\tCGroup own mask: %s\n", prefix
, strnull(s
));
1165 m
= unit_get_members_mask(u
);
1167 _cleanup_free_
char *s
= NULL
;
1168 (void) cg_mask_to_string(m
, &s
);
1169 fprintf(f
, "%s\tCGroup members mask: %s\n", prefix
, strnull(s
));
1172 SET_FOREACH(t
, u
->names
, i
)
1173 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
1175 if (!sd_id128_is_null(u
->invocation_id
))
1176 fprintf(f
, "%s\tInvocation ID: " SD_ID128_FORMAT_STR
"\n",
1177 prefix
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
1179 STRV_FOREACH(j
, u
->documentation
)
1180 fprintf(f
, "%s\tDocumentation: %s\n", prefix
, *j
);
1182 following
= unit_following(u
);
1184 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->id
);
1186 r
= unit_following_set(u
, &following_set
);
1190 SET_FOREACH(other
, following_set
, i
)
1191 fprintf(f
, "%s\tFollowing Set Member: %s\n", prefix
, other
->id
);
1194 if (u
->fragment_path
)
1195 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->fragment_path
);
1198 fprintf(f
, "%s\tSource Path: %s\n", prefix
, u
->source_path
);
1200 STRV_FOREACH(j
, u
->dropin_paths
)
1201 fprintf(f
, "%s\tDropIn Path: %s\n", prefix
, *j
);
1203 if (u
->failure_action
!= EMERGENCY_ACTION_NONE
)
1204 fprintf(f
, "%s\tFailure Action: %s\n", prefix
, emergency_action_to_string(u
->failure_action
));
1205 if (u
->success_action
!= EMERGENCY_ACTION_NONE
)
1206 fprintf(f
, "%s\tSuccess Action: %s\n", prefix
, emergency_action_to_string(u
->success_action
));
1208 if (u
->job_timeout
!= USEC_INFINITY
)
1209 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->job_timeout
, 0));
1211 if (u
->job_timeout_action
!= EMERGENCY_ACTION_NONE
)
1212 fprintf(f
, "%s\tJob Timeout Action: %s\n", prefix
, emergency_action_to_string(u
->job_timeout_action
));
1214 if (u
->job_timeout_reboot_arg
)
1215 fprintf(f
, "%s\tJob Timeout Reboot Argument: %s\n", prefix
, u
->job_timeout_reboot_arg
);
1217 condition_dump_list(u
->conditions
, f
, prefix
, condition_type_to_string
);
1218 condition_dump_list(u
->asserts
, f
, prefix
, assert_type_to_string
);
1220 if (dual_timestamp_is_set(&u
->condition_timestamp
))
1222 "%s\tCondition Timestamp: %s\n"
1223 "%s\tCondition Result: %s\n",
1224 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->condition_timestamp
.realtime
)),
1225 prefix
, yes_no(u
->condition_result
));
1227 if (dual_timestamp_is_set(&u
->assert_timestamp
))
1229 "%s\tAssert Timestamp: %s\n"
1230 "%s\tAssert Result: %s\n",
1231 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->assert_timestamp
.realtime
)),
1232 prefix
, yes_no(u
->assert_result
));
1234 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
1235 UnitDependencyInfo di
;
1238 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
1241 fprintf(f
, "%s\t%s: %s (", prefix
, unit_dependency_to_string(d
), other
->id
);
1243 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1244 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1250 if (!hashmap_isempty(u
->requires_mounts_for
)) {
1251 UnitDependencyInfo di
;
1254 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1257 fprintf(f
, "%s\tRequiresMountsFor: %s (", prefix
, path
);
1259 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1260 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1266 if (u
->load_state
== UNIT_LOADED
) {
1269 "%s\tStopWhenUnneeded: %s\n"
1270 "%s\tRefuseManualStart: %s\n"
1271 "%s\tRefuseManualStop: %s\n"
1272 "%s\tDefaultDependencies: %s\n"
1273 "%s\tOnFailureJobMode: %s\n"
1274 "%s\tIgnoreOnIsolate: %s\n",
1275 prefix
, yes_no(u
->stop_when_unneeded
),
1276 prefix
, yes_no(u
->refuse_manual_start
),
1277 prefix
, yes_no(u
->refuse_manual_stop
),
1278 prefix
, yes_no(u
->default_dependencies
),
1279 prefix
, job_mode_to_string(u
->on_failure_job_mode
),
1280 prefix
, yes_no(u
->ignore_on_isolate
));
1282 if (UNIT_VTABLE(u
)->dump
)
1283 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
1285 } else if (u
->load_state
== UNIT_MERGED
)
1287 "%s\tMerged into: %s\n",
1288 prefix
, u
->merged_into
->id
);
1289 else if (u
->load_state
== UNIT_ERROR
)
1290 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror(-u
->load_error
));
1292 for (n
= sd_bus_track_first(u
->bus_track
); n
; n
= sd_bus_track_next(u
->bus_track
))
1293 fprintf(f
, "%s\tBus Ref: %s\n", prefix
, n
);
1296 job_dump(u
->job
, f
, prefix2
);
1299 job_dump(u
->nop_job
, f
, prefix2
);
1302 /* Common implementation for multiple backends */
1303 int unit_load_fragment_and_dropin(Unit
*u
) {
1308 /* Load a .{service,socket,...} file */
1309 r
= unit_load_fragment(u
);
1313 if (u
->load_state
== UNIT_STUB
)
1316 /* Load drop-in directory data. If u is an alias, we might be reloading the
1317 * target unit needlessly. But we cannot be sure which drops-ins have already
1318 * been loaded and which not, at least without doing complicated book-keeping,
1319 * so let's always reread all drop-ins. */
1320 return unit_load_dropin(unit_follow_merge(u
));
1323 /* Common implementation for multiple backends */
1324 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
1329 /* Same as unit_load_fragment_and_dropin(), but whether
1330 * something can be loaded or not doesn't matter. */
1332 /* Load a .service file */
1333 r
= unit_load_fragment(u
);
1337 if (u
->load_state
== UNIT_STUB
)
1338 u
->load_state
= UNIT_LOADED
;
1340 /* Load drop-in directory data */
1341 return unit_load_dropin(unit_follow_merge(u
));
1344 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1348 if (target
->type
!= UNIT_TARGET
)
1351 /* Only add the dependency if both units are loaded, so that
1352 * that loop check below is reliable */
1353 if (u
->load_state
!= UNIT_LOADED
||
1354 target
->load_state
!= UNIT_LOADED
)
1357 /* If either side wants no automatic dependencies, then let's
1359 if (!u
->default_dependencies
||
1360 !target
->default_dependencies
)
1363 /* Don't create loops */
1364 if (hashmap_get(target
->dependencies
[UNIT_BEFORE
], u
))
1367 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1370 static int unit_add_target_dependencies(Unit
*u
) {
1372 static const UnitDependency deps
[] = {
1384 for (k
= 0; k
< ELEMENTSOF(deps
); k
++) {
1389 HASHMAP_FOREACH_KEY(v
, target
, u
->dependencies
[deps
[k
]], i
) {
1390 r
= unit_add_default_target_dependency(u
, target
);
1399 static int unit_add_slice_dependencies(Unit
*u
) {
1400 UnitDependencyMask mask
;
1403 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1406 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1407 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1409 mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1411 if (UNIT_ISSET(u
->slice
))
1412 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, UNIT_DEREF(u
->slice
), true, mask
);
1414 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1417 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, NULL
, true, mask
);
1420 static int unit_add_mount_dependencies(Unit
*u
) {
1421 UnitDependencyInfo di
;
1428 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1429 char prefix
[strlen(path
) + 1];
1431 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1432 _cleanup_free_
char *p
= NULL
;
1435 r
= unit_name_from_path(prefix
, ".mount", &p
);
1439 m
= manager_get_unit(u
->manager
, p
);
1441 /* Make sure to load the mount unit if
1442 * it exists. If so the dependencies
1443 * on this unit will be added later
1444 * during the loading of the mount
1446 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1452 if (m
->load_state
!= UNIT_LOADED
)
1455 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1459 if (m
->fragment_path
) {
1460 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1470 static int unit_add_startup_units(Unit
*u
) {
1474 c
= unit_get_cgroup_context(u
);
1478 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1479 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1480 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1483 r
= set_ensure_allocated(&u
->manager
->startup_units
, NULL
);
1487 return set_put(u
->manager
->startup_units
, u
);
1490 int unit_load(Unit
*u
) {
1495 if (u
->in_load_queue
) {
1496 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1497 u
->in_load_queue
= false;
1500 if (u
->type
== _UNIT_TYPE_INVALID
)
1503 if (u
->load_state
!= UNIT_STUB
)
1506 if (u
->transient_file
) {
1507 r
= fflush_and_check(u
->transient_file
);
1511 u
->transient_file
= safe_fclose(u
->transient_file
);
1512 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1515 if (UNIT_VTABLE(u
)->load
) {
1516 r
= UNIT_VTABLE(u
)->load(u
);
1521 if (u
->load_state
== UNIT_STUB
) {
1526 if (u
->load_state
== UNIT_LOADED
) {
1528 r
= unit_add_target_dependencies(u
);
1532 r
= unit_add_slice_dependencies(u
);
1536 r
= unit_add_mount_dependencies(u
);
1540 r
= unit_add_startup_units(u
);
1544 if (u
->on_failure_job_mode
== JOB_ISOLATE
&& hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) > 1) {
1545 log_unit_error(u
, "More than one OnFailure= dependencies specified but OnFailureJobMode=isolate set. Refusing.");
1550 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1551 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1553 unit_update_cgroup_members_masks(u
);
1556 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1558 unit_add_to_dbus_queue(unit_follow_merge(u
));
1559 unit_add_to_gc_queue(u
);
1564 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
: UNIT_ERROR
;
1566 unit_add_to_dbus_queue(u
);
1567 unit_add_to_gc_queue(u
);
1569 log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1574 static bool unit_condition_test_list(Unit
*u
, Condition
*first
, const char *(*to_string
)(ConditionType t
)) {
1581 /* If the condition list is empty, then it is true */
1585 /* Otherwise, if all of the non-trigger conditions apply and
1586 * if any of the trigger conditions apply (unless there are
1587 * none) we return true */
1588 LIST_FOREACH(conditions
, c
, first
) {
1591 r
= condition_test(c
);
1594 "Couldn't determine result for %s=%s%s%s, assuming failed: %m",
1596 c
->trigger
? "|" : "",
1597 c
->negate
? "!" : "",
1603 c
->trigger
? "|" : "",
1604 c
->negate
? "!" : "",
1606 condition_result_to_string(c
->result
));
1608 if (!c
->trigger
&& r
<= 0)
1611 if (c
->trigger
&& triggered
<= 0)
1615 return triggered
!= 0;
1618 static bool unit_condition_test(Unit
*u
) {
1621 dual_timestamp_get(&u
->condition_timestamp
);
1622 u
->condition_result
= unit_condition_test_list(u
, u
->conditions
, condition_type_to_string
);
1624 return u
->condition_result
;
1627 static bool unit_assert_test(Unit
*u
) {
1630 dual_timestamp_get(&u
->assert_timestamp
);
1631 u
->assert_result
= unit_condition_test_list(u
, u
->asserts
, assert_type_to_string
);
1633 return u
->assert_result
;
1636 void unit_status_printf(Unit
*u
, const char *status
, const char *unit_status_msg_format
) {
1637 DISABLE_WARNING_FORMAT_NONLITERAL
;
1638 manager_status_printf(u
->manager
, STATUS_TYPE_NORMAL
, status
, unit_status_msg_format
, unit_description(u
));
1642 _pure_
static const char* unit_get_status_message_format(Unit
*u
, JobType t
) {
1644 const UnitStatusMessageFormats
*format_table
;
1647 assert(IN_SET(t
, JOB_START
, JOB_STOP
, JOB_RELOAD
));
1649 if (t
!= JOB_RELOAD
) {
1650 format_table
= &UNIT_VTABLE(u
)->status_message_formats
;
1652 format
= format_table
->starting_stopping
[t
== JOB_STOP
];
1658 /* Return generic strings */
1660 return "Starting %s.";
1661 else if (t
== JOB_STOP
)
1662 return "Stopping %s.";
1664 return "Reloading %s.";
1667 static void unit_status_print_starting_stopping(Unit
*u
, JobType t
) {
1672 /* Reload status messages have traditionally not been printed to console. */
1673 if (!IN_SET(t
, JOB_START
, JOB_STOP
))
1676 format
= unit_get_status_message_format(u
, t
);
1678 DISABLE_WARNING_FORMAT_NONLITERAL
;
1679 unit_status_printf(u
, "", format
);
1683 static void unit_status_log_starting_stopping_reloading(Unit
*u
, JobType t
) {
1684 const char *format
, *mid
;
1689 if (!IN_SET(t
, JOB_START
, JOB_STOP
, JOB_RELOAD
))
1692 if (log_on_console())
1695 /* We log status messages for all units and all operations. */
1697 format
= unit_get_status_message_format(u
, t
);
1699 DISABLE_WARNING_FORMAT_NONLITERAL
;
1700 xsprintf(buf
, format
, unit_description(u
));
1703 mid
= t
== JOB_START
? "MESSAGE_ID=" SD_MESSAGE_UNIT_STARTING_STR
:
1704 t
== JOB_STOP
? "MESSAGE_ID=" SD_MESSAGE_UNIT_STOPPING_STR
:
1705 "MESSAGE_ID=" SD_MESSAGE_UNIT_RELOADING_STR
;
1707 /* Note that we deliberately use LOG_MESSAGE() instead of
1708 * LOG_UNIT_MESSAGE() here, since this is supposed to mimic
1709 * closely what is written to screen using the status output,
1710 * which is supposed the highest level, friendliest output
1711 * possible, which means we should avoid the low-level unit
1713 log_struct(LOG_INFO
,
1714 LOG_MESSAGE("%s", buf
),
1716 LOG_UNIT_INVOCATION_ID(u
),
1721 void unit_status_emit_starting_stopping_reloading(Unit
*u
, JobType t
) {
1724 assert(t
< _JOB_TYPE_MAX
);
1726 unit_status_log_starting_stopping_reloading(u
, t
);
1727 unit_status_print_starting_stopping(u
, t
);
1730 int unit_start_limit_test(Unit
*u
) {
1733 if (ratelimit_test(&u
->start_limit
)) {
1734 u
->start_limit_hit
= false;
1738 log_unit_warning(u
, "Start request repeated too quickly.");
1739 u
->start_limit_hit
= true;
1741 return emergency_action(u
->manager
, u
->start_limit_action
, u
->reboot_arg
, "unit failed");
1744 bool unit_shall_confirm_spawn(Unit
*u
) {
1747 if (manager_is_confirm_spawn_disabled(u
->manager
))
1750 /* For some reasons units remaining in the same process group
1751 * as PID 1 fail to acquire the console even if it's not used
1752 * by any process. So skip the confirmation question for them. */
1753 return !unit_get_exec_context(u
)->same_pgrp
;
1756 static bool unit_verify_deps(Unit
*u
) {
1763 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined with
1764 * After=. We do not check Requires= or Requisite= here as they only should have an effect on the job
1765 * processing, but do not have any effect afterwards. We don't check BindsTo= dependencies that are not used in
1766 * conjunction with After= as for them any such check would make things entirely racy. */
1768 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], j
) {
1770 if (!hashmap_contains(u
->dependencies
[UNIT_AFTER
], other
))
1773 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1774 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1783 * -EBADR: This unit type does not support starting.
1784 * -EALREADY: Unit is already started.
1785 * -EAGAIN: An operation is already in progress. Retry later.
1786 * -ECANCELED: Too many requests for now.
1787 * -EPROTO: Assert failed
1788 * -EINVAL: Unit not loaded
1789 * -EOPNOTSUPP: Unit type not supported
1790 * -ENOLINK: The necessary dependencies are not fulfilled.
1792 int unit_start(Unit
*u
) {
1793 UnitActiveState state
;
1798 /* If this is already started, then this will succeed. Note
1799 * that this will even succeed if this unit is not startable
1800 * by the user. This is relied on to detect when we need to
1801 * wait for units and when waiting is finished. */
1802 state
= unit_active_state(u
);
1803 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1806 /* Units that aren't loaded cannot be started */
1807 if (u
->load_state
!= UNIT_LOADED
)
1810 /* If the conditions failed, don't do anything at all. If we
1811 * already are activating this call might still be useful to
1812 * speed up activation in case there is some hold-off time,
1813 * but we don't want to recheck the condition in that case. */
1814 if (state
!= UNIT_ACTIVATING
&&
1815 !unit_condition_test(u
)) {
1816 log_unit_debug(u
, "Starting requested but condition failed. Not starting unit.");
1820 /* If the asserts failed, fail the entire job */
1821 if (state
!= UNIT_ACTIVATING
&&
1822 !unit_assert_test(u
)) {
1823 log_unit_notice(u
, "Starting requested but asserts failed.");
1827 /* Units of types that aren't supported cannot be
1828 * started. Note that we do this test only after the condition
1829 * checks, so that we rather return condition check errors
1830 * (which are usually not considered a true failure) than "not
1831 * supported" errors (which are considered a failure).
1833 if (!unit_supported(u
))
1836 /* Let's make sure that the deps really are in order before we start this. Normally the job engine should have
1837 * taken care of this already, but let's check this here again. After all, our dependencies might not be in
1838 * effect anymore, due to a reload or due to a failed condition. */
1839 if (!unit_verify_deps(u
))
1842 /* Forward to the main object, if we aren't it. */
1843 following
= unit_following(u
);
1845 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1846 return unit_start(following
);
1849 /* If it is stopped, but we cannot start it, then fail */
1850 if (!UNIT_VTABLE(u
)->start
)
1853 /* We don't suppress calls to ->start() here when we are
1854 * already starting, to allow this request to be used as a
1855 * "hurry up" call, for example when the unit is in some "auto
1856 * restart" state where it waits for a holdoff timer to elapse
1857 * before it will start again. */
1859 unit_add_to_dbus_queue(u
);
1861 return UNIT_VTABLE(u
)->start(u
);
1864 bool unit_can_start(Unit
*u
) {
1867 if (u
->load_state
!= UNIT_LOADED
)
1870 if (!unit_supported(u
))
1873 return !!UNIT_VTABLE(u
)->start
;
1876 bool unit_can_isolate(Unit
*u
) {
1879 return unit_can_start(u
) &&
1884 * -EBADR: This unit type does not support stopping.
1885 * -EALREADY: Unit is already stopped.
1886 * -EAGAIN: An operation is already in progress. Retry later.
1888 int unit_stop(Unit
*u
) {
1889 UnitActiveState state
;
1894 state
= unit_active_state(u
);
1895 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1898 following
= unit_following(u
);
1900 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1901 return unit_stop(following
);
1904 if (!UNIT_VTABLE(u
)->stop
)
1907 unit_add_to_dbus_queue(u
);
1909 return UNIT_VTABLE(u
)->stop(u
);
1912 bool unit_can_stop(Unit
*u
) {
1915 if (!unit_supported(u
))
1921 return !!UNIT_VTABLE(u
)->stop
;
1925 * -EBADR: This unit type does not support reloading.
1926 * -ENOEXEC: Unit is not started.
1927 * -EAGAIN: An operation is already in progress. Retry later.
1929 int unit_reload(Unit
*u
) {
1930 UnitActiveState state
;
1935 if (u
->load_state
!= UNIT_LOADED
)
1938 if (!unit_can_reload(u
))
1941 state
= unit_active_state(u
);
1942 if (state
== UNIT_RELOADING
)
1945 if (state
!= UNIT_ACTIVE
) {
1946 log_unit_warning(u
, "Unit cannot be reloaded because it is inactive.");
1950 following
= unit_following(u
);
1952 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1953 return unit_reload(following
);
1956 unit_add_to_dbus_queue(u
);
1958 if (!UNIT_VTABLE(u
)->reload
) {
1959 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
1960 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), true);
1964 return UNIT_VTABLE(u
)->reload(u
);
1967 bool unit_can_reload(Unit
*u
) {
1970 if (UNIT_VTABLE(u
)->can_reload
)
1971 return UNIT_VTABLE(u
)->can_reload(u
);
1973 if (!hashmap_isempty(u
->dependencies
[UNIT_PROPAGATES_RELOAD_TO
]))
1976 return UNIT_VTABLE(u
)->reload
;
1979 static void unit_check_unneeded(Unit
*u
) {
1981 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1983 static const UnitDependency needed_dependencies
[] = {
1995 /* If this service shall be shut down when unneeded then do
1998 if (!u
->stop_when_unneeded
)
2001 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
2004 for (j
= 0; j
< ELEMENTSOF(needed_dependencies
); j
++) {
2009 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[needed_dependencies
[j
]], i
)
2010 if (unit_active_or_pending(other
) || unit_will_restart(other
))
2014 /* If stopping a unit fails continuously we might enter a stop
2015 * loop here, hence stop acting on the service being
2016 * unnecessary after a while. */
2017 if (!ratelimit_test(&u
->auto_stop_ratelimit
)) {
2018 log_unit_warning(u
, "Unit not needed anymore, but not stopping since we tried this too often recently.");
2022 log_unit_info(u
, "Unit not needed anymore. Stopping.");
2024 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
2025 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
2027 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2030 static void unit_check_binds_to(Unit
*u
) {
2031 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2043 if (unit_active_state(u
) != UNIT_ACTIVE
)
2046 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
) {
2050 if (!other
->coldplugged
)
2051 /* We might yet create a job for the other unit… */
2054 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2064 /* If stopping a unit fails continuously we might enter a stop
2065 * loop here, hence stop acting on the service being
2066 * unnecessary after a while. */
2067 if (!ratelimit_test(&u
->auto_stop_ratelimit
)) {
2068 log_unit_warning(u
, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other
->id
);
2073 log_unit_info(u
, "Unit is bound to inactive unit %s. Stopping, too.", other
->id
);
2075 /* A unit we need to run is gone. Sniff. Let's stop this. */
2076 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
2078 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2081 static void retroactively_start_dependencies(Unit
*u
) {
2087 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2089 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], i
)
2090 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2091 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2092 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
2094 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2095 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2096 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2097 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
2099 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
], i
)
2100 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2101 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2102 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
);
2104 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTS
], i
)
2105 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2106 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2108 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTED_BY
], i
)
2109 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2110 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2113 static void retroactively_stop_dependencies(Unit
*u
) {
2119 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2121 /* Pull down units which are bound to us recursively if enabled */
2122 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
2123 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2124 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2127 static void check_unneeded_dependencies(Unit
*u
) {
2133 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2135 /* Garbage collect services that might not be needed anymore, if enabled */
2136 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], 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_WANTS
], 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_REQUISITE
], i
)
2143 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2144 unit_check_unneeded(other
);
2145 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2146 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2147 unit_check_unneeded(other
);
2150 void unit_start_on_failure(Unit
*u
) {
2157 if (hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
2160 log_unit_info(u
, "Triggering OnFailure= dependencies.");
2162 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_ON_FAILURE
], i
) {
2165 r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_job_mode
, NULL
, NULL
);
2167 log_unit_error_errno(u
, r
, "Failed to enqueue OnFailure= job: %m");
2171 void unit_trigger_notify(Unit
*u
) {
2178 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_TRIGGERED_BY
], i
)
2179 if (UNIT_VTABLE(other
)->trigger_notify
)
2180 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2183 static int unit_log_resources(Unit
*u
) {
2185 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ 4];
2186 size_t n_message_parts
= 0, n_iovec
= 0;
2187 char* message_parts
[3 + 1], *t
;
2188 nsec_t nsec
= NSEC_INFINITY
;
2189 CGroupIPAccountingMetric m
;
2192 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2193 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2194 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2195 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2196 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2201 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2202 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2203 * information and the complete data in structured fields. */
2205 (void) unit_get_cpu_usage(u
, &nsec
);
2206 if (nsec
!= NSEC_INFINITY
) {
2207 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2209 /* Format the CPU time for inclusion in the structured log message */
2210 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2214 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2216 /* Format the CPU time for inclusion in the human language message string */
2217 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2218 t
= strjoin(n_message_parts
> 0 ? "consumed " : "Consumed ", buf
, " CPU time");
2224 message_parts
[n_message_parts
++] = t
;
2227 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2228 char buf
[FORMAT_BYTES_MAX
] = "";
2229 uint64_t value
= UINT64_MAX
;
2231 assert(ip_fields
[m
]);
2233 (void) unit_get_ip_accounting(u
, m
, &value
);
2234 if (value
== UINT64_MAX
)
2237 /* Format IP accounting data for inclusion in the structured log message */
2238 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2242 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2244 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2245 * bytes counters (and not for the packets counters) */
2246 if (m
== CGROUP_IP_INGRESS_BYTES
)
2247 t
= strjoin(n_message_parts
> 0 ? "received " : "Received ",
2248 format_bytes(buf
, sizeof(buf
), value
),
2250 else if (m
== CGROUP_IP_EGRESS_BYTES
)
2251 t
= strjoin(n_message_parts
> 0 ? "sent " : "Sent ",
2252 format_bytes(buf
, sizeof(buf
), value
),
2261 message_parts
[n_message_parts
++] = t
;
2264 /* Is there any accounting data available at all? */
2270 if (n_message_parts
== 0)
2271 t
= strjoina("MESSAGE=", u
->id
, ": Completed");
2273 _cleanup_free_
char *joined
;
2275 message_parts
[n_message_parts
] = NULL
;
2277 joined
= strv_join(message_parts
, ", ");
2283 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
);
2286 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2287 * and hence don't increase n_iovec for them */
2288 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2289 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2291 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2292 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2294 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2295 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2297 log_struct_iovec(LOG_INFO
, iovec
, n_iovec
+ 4);
2301 for (i
= 0; i
< n_message_parts
; i
++)
2302 free(message_parts
[i
]);
2304 for (i
= 0; i
< n_iovec
; i
++)
2305 free(iovec
[i
].iov_base
);
2311 static void unit_update_on_console(Unit
*u
) {
2316 b
= unit_needs_console(u
);
2317 if (u
->on_console
== b
)
2322 manager_ref_console(u
->manager
);
2324 manager_unref_console(u
->manager
);
2328 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
2333 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2334 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2336 /* Note that this is called for all low-level state changes,
2337 * even if they might map to the same high-level
2338 * UnitActiveState! That means that ns == os is an expected
2339 * behavior here. For example: if a mount point is remounted
2340 * this function will be called too! */
2344 /* Update timestamps for state changes */
2345 if (!MANAGER_IS_RELOADING(m
)) {
2346 dual_timestamp_get(&u
->state_change_timestamp
);
2348 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2349 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2350 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2351 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2353 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2354 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2355 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2356 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2359 /* Keep track of failed units */
2360 (void) manager_update_failed_units(u
->manager
, u
, ns
== UNIT_FAILED
);
2362 /* Make sure the cgroup and state files are always removed when we become inactive */
2363 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2364 unit_prune_cgroup(u
);
2365 unit_unlink_state_files(u
);
2368 unit_update_on_console(u
);
2373 if (u
->job
->state
== JOB_WAITING
)
2375 /* So we reached a different state for this
2376 * job. Let's see if we can run it now if it
2377 * failed previously due to EAGAIN. */
2378 job_add_to_run_queue(u
->job
);
2380 /* Let's check whether this state change constitutes a
2381 * finished job, or maybe contradicts a running job and
2382 * hence needs to invalidate jobs. */
2384 switch (u
->job
->type
) {
2387 case JOB_VERIFY_ACTIVE
:
2389 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2390 job_finish_and_invalidate(u
->job
, JOB_DONE
, true, false);
2391 else if (u
->job
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2394 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2395 job_finish_and_invalidate(u
->job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2401 case JOB_RELOAD_OR_START
:
2402 case JOB_TRY_RELOAD
:
2404 if (u
->job
->state
== JOB_RUNNING
) {
2405 if (ns
== UNIT_ACTIVE
)
2406 job_finish_and_invalidate(u
->job
, reload_success
? JOB_DONE
: JOB_FAILED
, true, false);
2407 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2410 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2411 job_finish_and_invalidate(u
->job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2419 case JOB_TRY_RESTART
:
2421 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2422 job_finish_and_invalidate(u
->job
, JOB_DONE
, true, false);
2423 else if (u
->job
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2425 job_finish_and_invalidate(u
->job
, JOB_FAILED
, true, false);
2431 assert_not_reached("Job type unknown");
2437 if (!MANAGER_IS_RELOADING(m
)) {
2439 /* If this state change happened without being
2440 * requested by a job, then let's retroactively start
2441 * or stop dependencies. We skip that step when
2442 * deserializing, since we don't want to create any
2443 * additional jobs just because something is already
2447 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2448 retroactively_start_dependencies(u
);
2449 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2450 retroactively_stop_dependencies(u
);
2453 /* stop unneeded units regardless if going down was expected or not */
2454 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2455 check_unneeded_dependencies(u
);
2457 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2458 log_unit_debug(u
, "Unit entered failed state.");
2459 unit_start_on_failure(u
);
2463 /* Some names are special */
2464 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2466 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
))
2467 /* The bus might have just become available,
2468 * hence try to connect to it, if we aren't
2472 if (u
->type
== UNIT_SERVICE
&&
2473 !UNIT_IS_ACTIVE_OR_RELOADING(os
) &&
2474 !MANAGER_IS_RELOADING(m
)) {
2475 /* Write audit record if we have just finished starting up */
2476 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_START
, true);
2480 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
))
2481 manager_send_unit_plymouth(m
, u
);
2484 /* We don't care about D-Bus going down here, since we'll get an asynchronous notification for it
2487 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) &&
2488 !UNIT_IS_INACTIVE_OR_FAILED(os
)
2489 && !MANAGER_IS_RELOADING(m
)) {
2491 /* This unit just stopped/failed. */
2492 if (u
->type
== UNIT_SERVICE
) {
2494 /* Hmm, if there was no start record written
2495 * write it now, so that we always have a nice
2498 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_START
, ns
== UNIT_INACTIVE
);
2500 if (ns
== UNIT_INACTIVE
)
2501 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_STOP
, true);
2503 /* Write audit record if we have just finished shutting down */
2504 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_STOP
, ns
== UNIT_INACTIVE
);
2506 u
->in_audit
= false;
2509 /* Write a log message about consumed resources */
2510 unit_log_resources(u
);
2514 manager_recheck_journal(m
);
2515 unit_trigger_notify(u
);
2517 if (!MANAGER_IS_RELOADING(u
->manager
)) {
2518 /* Maybe we finished startup and are now ready for
2519 * being stopped because unneeded? */
2520 unit_check_unneeded(u
);
2522 /* Maybe we finished startup, but something we needed
2523 * has vanished? Let's die then. (This happens when
2524 * something BindsTo= to a Type=oneshot unit, as these
2525 * units go directly from starting to inactive,
2526 * without ever entering started.) */
2527 unit_check_binds_to(u
);
2529 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
)
2530 (void) emergency_action(u
->manager
, u
->failure_action
, u
->reboot_arg
, "unit failed");
2531 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
)
2532 (void) emergency_action(u
->manager
, u
->success_action
, u
->reboot_arg
, "unit succeeded");
2535 unit_add_to_dbus_queue(u
);
2536 unit_add_to_gc_queue(u
);
2539 int unit_watch_pid(Unit
*u
, pid_t pid
) {
2543 assert(pid_is_valid(pid
));
2545 /* Watch a specific PID */
2547 r
= set_ensure_allocated(&u
->pids
, NULL
);
2551 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2555 /* First try, let's add the unit keyed by "pid". */
2556 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2562 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2563 * to an array of Units rather than just a Unit), lists us already. */
2565 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2567 for (; array
[n
]; n
++)
2571 if (found
) /* Found it already? if so, do nothing */
2576 /* Allocate a new array */
2577 new_array
= new(Unit
*, n
+ 2);
2581 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2583 new_array
[n
+1] = NULL
;
2585 /* Add or replace the old array */
2586 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2597 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2604 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2608 assert(pid_is_valid(pid
));
2610 /* First let's drop the unit in case it's keyed as "pid". */
2611 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2613 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2614 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2618 /* Let's iterate through the array, dropping our own entry */
2619 for (n
= 0; array
[n
]; n
++)
2621 array
[m
++] = array
[n
];
2625 /* The array is now empty, remove the entire entry */
2626 assert(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2631 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2634 void unit_unwatch_all_pids(Unit
*u
) {
2637 while (!set_isempty(u
->pids
))
2638 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2640 u
->pids
= set_free(u
->pids
);
2643 void unit_tidy_watch_pids(Unit
*u
, pid_t except1
, pid_t except2
) {
2649 /* Cleans dead PIDs from our list */
2651 SET_FOREACH(e
, u
->pids
, i
) {
2652 pid_t pid
= PTR_TO_PID(e
);
2654 if (pid
== except1
|| pid
== except2
)
2657 if (!pid_is_unwaited(pid
))
2658 unit_unwatch_pid(u
, pid
);
2662 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2664 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2668 case JOB_VERIFY_ACTIVE
:
2671 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2672 * startable by us but may appear due to external events, and it thus makes sense to permit enqueing
2677 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2678 * external events), hence it makes no sense to permit enqueing such a request either. */
2679 return !u
->perpetual
;
2682 case JOB_TRY_RESTART
:
2683 return unit_can_stop(u
) && unit_can_start(u
);
2686 case JOB_TRY_RELOAD
:
2687 return unit_can_reload(u
);
2689 case JOB_RELOAD_OR_START
:
2690 return unit_can_reload(u
) && unit_can_start(u
);
2693 assert_not_reached("Invalid job type");
2697 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
) {
2700 /* Only warn about some unit types */
2701 if (!IN_SET(dependency
, UNIT_CONFLICTS
, UNIT_CONFLICTED_BY
, UNIT_BEFORE
, UNIT_AFTER
, UNIT_ON_FAILURE
, UNIT_TRIGGERS
, UNIT_TRIGGERED_BY
))
2704 if (streq_ptr(u
->id
, other
))
2705 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
2707 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other
), u
->id
);
2710 static int unit_add_dependency_hashmap(
2713 UnitDependencyMask origin_mask
,
2714 UnitDependencyMask destination_mask
) {
2716 UnitDependencyInfo info
;
2721 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2722 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2723 assert(origin_mask
> 0 || destination_mask
> 0);
2725 r
= hashmap_ensure_allocated(h
, NULL
);
2729 assert_cc(sizeof(void*) == sizeof(info
));
2731 info
.data
= hashmap_get(*h
, other
);
2733 /* Entry already exists. Add in our mask. */
2735 if ((info
.origin_mask
& origin_mask
) == info
.origin_mask
&&
2736 (info
.destination_mask
& destination_mask
) == info
.destination_mask
)
2739 info
.origin_mask
|= origin_mask
;
2740 info
.destination_mask
|= destination_mask
;
2742 r
= hashmap_update(*h
, other
, info
.data
);
2744 info
= (UnitDependencyInfo
) {
2745 .origin_mask
= origin_mask
,
2746 .destination_mask
= destination_mask
,
2749 r
= hashmap_put(*h
, other
, info
.data
);
2757 int unit_add_dependency(
2762 UnitDependencyMask mask
) {
2764 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2765 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2766 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2767 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2768 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2769 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2770 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
2771 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
2772 [UNIT_WANTED_BY
] = UNIT_WANTS
,
2773 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
2774 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
2775 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
2776 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
2777 [UNIT_BEFORE
] = UNIT_AFTER
,
2778 [UNIT_AFTER
] = UNIT_BEFORE
,
2779 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
2780 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
2781 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
2782 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
2783 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
2784 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
2785 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
2786 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
,
2788 Unit
*original_u
= u
, *original_other
= other
;
2792 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
2795 u
= unit_follow_merge(u
);
2796 other
= unit_follow_merge(other
);
2798 /* We won't allow dependencies on ourselves. We will not
2799 * consider them an error however. */
2801 maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
2805 if ((d
== UNIT_BEFORE
&& other
->type
== UNIT_DEVICE
) ||
2806 (d
== UNIT_AFTER
&& u
->type
== UNIT_DEVICE
)) {
2807 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
2811 r
= unit_add_dependency_hashmap(u
->dependencies
+ d
, other
, mask
, 0);
2815 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
2816 r
= unit_add_dependency_hashmap(other
->dependencies
+ inverse_table
[d
], u
, 0, mask
);
2821 if (add_reference
) {
2822 r
= unit_add_dependency_hashmap(u
->dependencies
+ UNIT_REFERENCES
, other
, mask
, 0);
2826 r
= unit_add_dependency_hashmap(other
->dependencies
+ UNIT_REFERENCED_BY
, u
, 0, mask
);
2831 unit_add_to_dbus_queue(u
);
2835 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
2840 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2844 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
2847 static int resolve_template(Unit
*u
, const char *name
, const char*path
, char **buf
, const char **ret
) {
2851 assert(name
|| path
);
2856 name
= basename(path
);
2858 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
2865 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
2867 _cleanup_free_
char *i
= NULL
;
2869 r
= unit_name_to_prefix(u
->id
, &i
);
2873 r
= unit_name_replace_instance(name
, i
, buf
);
2882 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
, UnitDependencyMask mask
) {
2883 _cleanup_free_
char *buf
= NULL
;
2888 assert(name
|| path
);
2890 r
= resolve_template(u
, name
, path
, &buf
, &name
);
2894 r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
);
2898 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2901 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
, UnitDependencyMask mask
) {
2902 _cleanup_free_
char *buf
= NULL
;
2907 assert(name
|| path
);
2909 r
= resolve_template(u
, name
, path
, &buf
, &name
);
2913 r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
);
2917 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
2920 int set_unit_path(const char *p
) {
2921 /* This is mostly for debug purposes */
2922 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
2928 char *unit_dbus_path(Unit
*u
) {
2934 return unit_dbus_path_from_name(u
->id
);
2937 char *unit_dbus_path_invocation_id(Unit
*u
) {
2940 if (sd_id128_is_null(u
->invocation_id
))
2943 return unit_dbus_path_from_name(u
->invocation_id_string
);
2946 int unit_set_slice(Unit
*u
, Unit
*slice
) {
2950 /* Sets the unit slice if it has not been set before. Is extra
2951 * careful, to only allow this for units that actually have a
2952 * cgroup context. Also, we don't allow to set this for slices
2953 * (since the parent slice is derived from the name). Make
2954 * sure the unit we set is actually a slice. */
2956 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2959 if (u
->type
== UNIT_SLICE
)
2962 if (unit_active_state(u
) != UNIT_INACTIVE
)
2965 if (slice
->type
!= UNIT_SLICE
)
2968 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
2969 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
2972 if (UNIT_DEREF(u
->slice
) == slice
)
2975 /* Disallow slice changes if @u is already bound to cgroups */
2976 if (UNIT_ISSET(u
->slice
) && u
->cgroup_realized
)
2979 unit_ref_unset(&u
->slice
);
2980 unit_ref_set(&u
->slice
, slice
);
2984 int unit_set_default_slice(Unit
*u
) {
2985 _cleanup_free_
char *b
= NULL
;
2986 const char *slice_name
;
2992 if (UNIT_ISSET(u
->slice
))
2996 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
2998 /* Implicitly place all instantiated units in their
2999 * own per-template slice */
3001 r
= unit_name_to_prefix(u
->id
, &prefix
);
3005 /* The prefix is already escaped, but it might include
3006 * "-" which has a special meaning for slice units,
3007 * hence escape it here extra. */
3008 escaped
= unit_name_escape(prefix
);
3012 if (MANAGER_IS_SYSTEM(u
->manager
))
3013 b
= strjoin("system-", escaped
, ".slice");
3015 b
= strappend(escaped
, ".slice");
3022 MANAGER_IS_SYSTEM(u
->manager
) && !unit_has_name(u
, SPECIAL_INIT_SCOPE
)
3023 ? SPECIAL_SYSTEM_SLICE
3024 : SPECIAL_ROOT_SLICE
;
3026 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3030 return unit_set_slice(u
, slice
);
3033 const char *unit_slice_name(Unit
*u
) {
3036 if (!UNIT_ISSET(u
->slice
))
3039 return UNIT_DEREF(u
->slice
)->id
;
3042 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3043 _cleanup_free_
char *t
= NULL
;
3050 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3053 if (unit_has_name(u
, t
))
3056 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3057 assert(r
< 0 || *_found
!= u
);
3061 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3062 const char *name
, *old_owner
, *new_owner
;
3069 r
= sd_bus_message_read(message
, "sss", &name
, &old_owner
, &new_owner
);
3071 bus_log_parse_error(r
);
3075 old_owner
= empty_to_null(old_owner
);
3076 new_owner
= empty_to_null(new_owner
);
3078 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3079 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
3084 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3091 if (u
->match_bus_slot
)
3094 match
= strjoina("type='signal',"
3095 "sender='org.freedesktop.DBus',"
3096 "path='/org/freedesktop/DBus',"
3097 "interface='org.freedesktop.DBus',"
3098 "member='NameOwnerChanged',"
3099 "arg0='", name
, "'");
3101 return sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3104 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3110 /* Watch a specific name on the bus. We only support one unit
3111 * watching each name for now. */
3113 if (u
->manager
->api_bus
) {
3114 /* If the bus is already available, install the match directly.
3115 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3116 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3118 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3121 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3123 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3124 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3130 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3134 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3135 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3138 bool unit_can_serialize(Unit
*u
) {
3141 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
3144 static int unit_serialize_cgroup_mask(FILE *f
, const char *key
, CGroupMask mask
) {
3145 _cleanup_free_
char *s
= NULL
;
3152 r
= cg_mask_to_string(mask
, &s
);
3163 static const char *ip_accounting_metric_field
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
3164 [CGROUP_IP_INGRESS_BYTES
] = "ip-accounting-ingress-bytes",
3165 [CGROUP_IP_INGRESS_PACKETS
] = "ip-accounting-ingress-packets",
3166 [CGROUP_IP_EGRESS_BYTES
] = "ip-accounting-egress-bytes",
3167 [CGROUP_IP_EGRESS_PACKETS
] = "ip-accounting-egress-packets",
3170 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
, bool serialize_jobs
) {
3171 CGroupIPAccountingMetric m
;
3178 if (unit_can_serialize(u
)) {
3179 r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
);
3184 dual_timestamp_serialize(f
, "state-change-timestamp", &u
->state_change_timestamp
);
3186 dual_timestamp_serialize(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
3187 dual_timestamp_serialize(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
3188 dual_timestamp_serialize(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
3189 dual_timestamp_serialize(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
3191 dual_timestamp_serialize(f
, "condition-timestamp", &u
->condition_timestamp
);
3192 dual_timestamp_serialize(f
, "assert-timestamp", &u
->assert_timestamp
);
3194 if (dual_timestamp_is_set(&u
->condition_timestamp
))
3195 unit_serialize_item(u
, f
, "condition-result", yes_no(u
->condition_result
));
3197 if (dual_timestamp_is_set(&u
->assert_timestamp
))
3198 unit_serialize_item(u
, f
, "assert-result", yes_no(u
->assert_result
));
3200 unit_serialize_item(u
, f
, "transient", yes_no(u
->transient
));
3202 unit_serialize_item(u
, f
, "exported-invocation-id", yes_no(u
->exported_invocation_id
));
3203 unit_serialize_item(u
, f
, "exported-log-level-max", yes_no(u
->exported_log_level_max
));
3204 unit_serialize_item(u
, f
, "exported-log-extra-fields", yes_no(u
->exported_log_extra_fields
));
3206 unit_serialize_item_format(u
, f
, "cpu-usage-base", "%" PRIu64
, u
->cpu_usage_base
);
3207 if (u
->cpu_usage_last
!= NSEC_INFINITY
)
3208 unit_serialize_item_format(u
, f
, "cpu-usage-last", "%" PRIu64
, u
->cpu_usage_last
);
3211 unit_serialize_item(u
, f
, "cgroup", u
->cgroup_path
);
3212 unit_serialize_item(u
, f
, "cgroup-realized", yes_no(u
->cgroup_realized
));
3213 (void) unit_serialize_cgroup_mask(f
, "cgroup-realized-mask", u
->cgroup_realized_mask
);
3214 (void) unit_serialize_cgroup_mask(f
, "cgroup-enabled-mask", u
->cgroup_enabled_mask
);
3215 unit_serialize_item_format(u
, f
, "cgroup-bpf-realized", "%i", u
->cgroup_bpf_state
);
3217 if (uid_is_valid(u
->ref_uid
))
3218 unit_serialize_item_format(u
, f
, "ref-uid", UID_FMT
, u
->ref_uid
);
3219 if (gid_is_valid(u
->ref_gid
))
3220 unit_serialize_item_format(u
, f
, "ref-gid", GID_FMT
, u
->ref_gid
);
3222 if (!sd_id128_is_null(u
->invocation_id
))
3223 unit_serialize_item_format(u
, f
, "invocation-id", SD_ID128_FORMAT_STR
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
3225 bus_track_serialize(u
->bus_track
, f
, "ref");
3227 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
3230 r
= unit_get_ip_accounting(u
, m
, &v
);
3232 unit_serialize_item_format(u
, f
, ip_accounting_metric_field
[m
], "%" PRIu64
, v
);
3235 if (serialize_jobs
) {
3237 fprintf(f
, "job\n");
3238 job_serialize(u
->job
, f
);
3242 fprintf(f
, "job\n");
3243 job_serialize(u
->nop_job
, f
);
3252 int unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
3268 int unit_serialize_item_escaped(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
3269 _cleanup_free_
char *c
= NULL
;
3290 int unit_serialize_item_fd(Unit
*u
, FILE *f
, FDSet
*fds
, const char *key
, int fd
) {
3300 copy
= fdset_put_dup(fds
, fd
);
3304 fprintf(f
, "%s=%i\n", key
, copy
);
3308 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *format
, ...) {
3319 va_start(ap
, format
);
3320 vfprintf(f
, format
, ap
);
3326 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
3334 char line
[LINE_MAX
], *l
, *v
;
3335 CGroupIPAccountingMetric m
;
3338 if (!fgets(line
, sizeof(line
), f
)) {
3351 k
= strcspn(l
, "=");
3359 if (streq(l
, "job")) {
3361 /* new-style serialized job */
3368 r
= job_deserialize(j
, f
);
3374 r
= hashmap_put(u
->manager
->jobs
, UINT32_TO_PTR(j
->id
), j
);
3380 r
= job_install_deserialized(j
);
3382 hashmap_remove(u
->manager
->jobs
, UINT32_TO_PTR(j
->id
));
3386 } else /* legacy for pre-44 */
3387 log_unit_warning(u
, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v
);
3389 } else if (streq(l
, "state-change-timestamp")) {
3390 dual_timestamp_deserialize(v
, &u
->state_change_timestamp
);
3392 } else if (streq(l
, "inactive-exit-timestamp")) {
3393 dual_timestamp_deserialize(v
, &u
->inactive_exit_timestamp
);
3395 } else if (streq(l
, "active-enter-timestamp")) {
3396 dual_timestamp_deserialize(v
, &u
->active_enter_timestamp
);
3398 } else if (streq(l
, "active-exit-timestamp")) {
3399 dual_timestamp_deserialize(v
, &u
->active_exit_timestamp
);
3401 } else if (streq(l
, "inactive-enter-timestamp")) {
3402 dual_timestamp_deserialize(v
, &u
->inactive_enter_timestamp
);
3404 } else if (streq(l
, "condition-timestamp")) {
3405 dual_timestamp_deserialize(v
, &u
->condition_timestamp
);
3407 } else if (streq(l
, "assert-timestamp")) {
3408 dual_timestamp_deserialize(v
, &u
->assert_timestamp
);
3410 } else if (streq(l
, "condition-result")) {
3412 r
= parse_boolean(v
);
3414 log_unit_debug(u
, "Failed to parse condition result value %s, ignoring.", v
);
3416 u
->condition_result
= r
;
3420 } else if (streq(l
, "assert-result")) {
3422 r
= parse_boolean(v
);
3424 log_unit_debug(u
, "Failed to parse assert result value %s, ignoring.", v
);
3426 u
->assert_result
= r
;
3430 } else if (streq(l
, "transient")) {
3432 r
= parse_boolean(v
);
3434 log_unit_debug(u
, "Failed to parse transient bool %s, ignoring.", v
);
3440 } else if (streq(l
, "exported-invocation-id")) {
3442 r
= parse_boolean(v
);
3444 log_unit_debug(u
, "Failed to parse exported invocation ID bool %s, ignoring.", v
);
3446 u
->exported_invocation_id
= r
;
3450 } else if (streq(l
, "exported-log-level-max")) {
3452 r
= parse_boolean(v
);
3454 log_unit_debug(u
, "Failed to parse exported log level max bool %s, ignoring.", v
);
3456 u
->exported_log_level_max
= r
;
3460 } else if (streq(l
, "exported-log-extra-fields")) {
3462 r
= parse_boolean(v
);
3464 log_unit_debug(u
, "Failed to parse exported log extra fields bool %s, ignoring.", v
);
3466 u
->exported_log_extra_fields
= r
;
3470 } else if (STR_IN_SET(l
, "cpu-usage-base", "cpuacct-usage-base")) {
3472 r
= safe_atou64(v
, &u
->cpu_usage_base
);
3474 log_unit_debug(u
, "Failed to parse CPU usage base %s, ignoring.", v
);
3478 } else if (streq(l
, "cpu-usage-last")) {
3480 r
= safe_atou64(v
, &u
->cpu_usage_last
);
3482 log_unit_debug(u
, "Failed to read CPU usage last %s, ignoring.", v
);
3486 } else if (streq(l
, "cgroup")) {
3488 r
= unit_set_cgroup_path(u
, v
);
3490 log_unit_debug_errno(u
, r
, "Failed to set cgroup path %s, ignoring: %m", v
);
3492 (void) unit_watch_cgroup(u
);
3495 } else if (streq(l
, "cgroup-realized")) {
3498 b
= parse_boolean(v
);
3500 log_unit_debug(u
, "Failed to parse cgroup-realized bool %s, ignoring.", v
);
3502 u
->cgroup_realized
= b
;
3506 } else if (streq(l
, "cgroup-realized-mask")) {
3508 r
= cg_mask_from_string(v
, &u
->cgroup_realized_mask
);
3510 log_unit_debug(u
, "Failed to parse cgroup-realized-mask %s, ignoring.", v
);
3513 } else if (streq(l
, "cgroup-enabled-mask")) {
3515 r
= cg_mask_from_string(v
, &u
->cgroup_enabled_mask
);
3517 log_unit_debug(u
, "Failed to parse cgroup-enabled-mask %s, ignoring.", v
);
3520 } else if (streq(l
, "cgroup-bpf-realized")) {
3523 r
= safe_atoi(v
, &i
);
3525 log_unit_debug(u
, "Failed to parse cgroup BPF state %s, ignoring.", v
);
3527 u
->cgroup_bpf_state
=
3528 i
< 0 ? UNIT_CGROUP_BPF_INVALIDATED
:
3529 i
> 0 ? UNIT_CGROUP_BPF_ON
:
3530 UNIT_CGROUP_BPF_OFF
;
3534 } else if (streq(l
, "ref-uid")) {
3537 r
= parse_uid(v
, &uid
);
3539 log_unit_debug(u
, "Failed to parse referenced UID %s, ignoring.", v
);
3541 unit_ref_uid_gid(u
, uid
, GID_INVALID
);
3545 } else if (streq(l
, "ref-gid")) {
3548 r
= parse_gid(v
, &gid
);
3550 log_unit_debug(u
, "Failed to parse referenced GID %s, ignoring.", v
);
3552 unit_ref_uid_gid(u
, UID_INVALID
, gid
);
3554 } else if (streq(l
, "ref")) {
3556 r
= strv_extend(&u
->deserialized_refs
, v
);
3561 } else if (streq(l
, "invocation-id")) {
3564 r
= sd_id128_from_string(v
, &id
);
3566 log_unit_debug(u
, "Failed to parse invocation id %s, ignoring.", v
);
3568 r
= unit_set_invocation_id(u
, id
);
3570 log_unit_warning_errno(u
, r
, "Failed to set invocation ID for unit: %m");
3576 /* Check if this is an IP accounting metric serialization field */
3577 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++)
3578 if (streq(l
, ip_accounting_metric_field
[m
]))
3580 if (m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
) {
3583 r
= safe_atou64(v
, &c
);
3585 log_unit_debug(u
, "Failed to parse IP accounting value %s, ignoring.", v
);
3587 u
->ip_accounting_extra
[m
] = c
;
3591 if (unit_can_serialize(u
)) {
3592 r
= exec_runtime_deserialize_compat(u
, l
, v
, fds
);
3594 log_unit_warning(u
, "Failed to deserialize runtime parameter '%s', ignoring.", l
);
3598 /* Returns positive if key was handled by the call */
3602 r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
);
3604 log_unit_warning(u
, "Failed to deserialize unit parameter '%s', ignoring.", l
);
3608 /* Versions before 228 did not carry a state change timestamp. In this case, take the current time. This is
3609 * useful, so that timeouts based on this timestamp don't trigger too early, and is in-line with the logic from
3610 * before 228 where the base for timeouts was not persistent across reboots. */
3612 if (!dual_timestamp_is_set(&u
->state_change_timestamp
))
3613 dual_timestamp_get(&u
->state_change_timestamp
);
3615 /* Let's make sure that everything that is deserialized also gets any potential new cgroup settings applied
3616 * after we are done. For that we invalidate anything already realized, so that we can realize it again. */
3617 unit_invalidate_cgroup(u
, _CGROUP_MASK_ALL
);
3618 unit_invalidate_cgroup_bpf(u
);
3623 void unit_deserialize_skip(FILE *f
) {
3626 /* Skip serialized data for this unit. We don't know what it is. */
3629 char line
[LINE_MAX
], *l
;
3631 if (!fgets(line
, sizeof line
, f
))
3644 int unit_add_node_dependency(Unit
*u
, const char *what
, bool wants
, UnitDependency dep
, UnitDependencyMask mask
) {
3646 _cleanup_free_
char *e
= NULL
;
3651 /* Adds in links to the device node that this unit is based on */
3655 if (!is_device_path(what
))
3658 /* When device units aren't supported (such as in a
3659 * container), don't create dependencies on them. */
3660 if (!unit_type_supported(UNIT_DEVICE
))
3663 r
= unit_name_from_path(what
, ".device", &e
);
3667 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3671 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3672 dep
= UNIT_BINDS_TO
;
3674 r
= unit_add_two_dependencies(u
, UNIT_AFTER
,
3675 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3676 device
, true, mask
);
3681 r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false, mask
);
3689 int unit_coldplug(Unit
*u
) {
3695 /* Make sure we don't enter a loop, when coldplugging
3700 u
->coldplugged
= true;
3702 STRV_FOREACH(i
, u
->deserialized_refs
) {
3703 q
= bus_unit_track_add_name(u
, *i
);
3704 if (q
< 0 && r
>= 0)
3707 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3709 if (UNIT_VTABLE(u
)->coldplug
) {
3710 q
= UNIT_VTABLE(u
)->coldplug(u
);
3711 if (q
< 0 && r
>= 0)
3716 q
= job_coldplug(u
->job
);
3717 if (q
< 0 && r
>= 0)
3724 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3730 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3731 * are never out-of-date. */
3732 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3735 if (stat(path
, &st
) < 0)
3736 /* What, cannot access this anymore? */
3740 /* For masked files check if they are still so */
3741 return !null_or_empty(&st
);
3743 /* For non-empty files check the mtime */
3744 return timespec_load(&st
.st_mtim
) > mtime
;
3749 bool unit_need_daemon_reload(Unit
*u
) {
3750 _cleanup_strv_free_
char **t
= NULL
;
3755 /* For unit files, we allow masking… */
3756 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3757 u
->load_state
== UNIT_MASKED
))
3760 /* Source paths should not be masked… */
3761 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3764 if (u
->load_state
== UNIT_LOADED
)
3765 (void) unit_find_dropin_paths(u
, &t
);
3766 if (!strv_equal(u
->dropin_paths
, t
))
3769 /* … any drop-ins that are masked are simply omitted from the list. */
3770 STRV_FOREACH(path
, u
->dropin_paths
)
3771 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3777 void unit_reset_failed(Unit
*u
) {
3780 if (UNIT_VTABLE(u
)->reset_failed
)
3781 UNIT_VTABLE(u
)->reset_failed(u
);
3783 RATELIMIT_RESET(u
->start_limit
);
3784 u
->start_limit_hit
= false;
3787 Unit
*unit_following(Unit
*u
) {
3790 if (UNIT_VTABLE(u
)->following
)
3791 return UNIT_VTABLE(u
)->following(u
);
3796 bool unit_stop_pending(Unit
*u
) {
3799 /* This call does check the current state of the unit. It's
3800 * hence useful to be called from state change calls of the
3801 * unit itself, where the state isn't updated yet. This is
3802 * different from unit_inactive_or_pending() which checks both
3803 * the current state and for a queued job. */
3805 return u
->job
&& u
->job
->type
== JOB_STOP
;
3808 bool unit_inactive_or_pending(Unit
*u
) {
3811 /* Returns true if the unit is inactive or going down */
3813 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3816 if (unit_stop_pending(u
))
3822 bool unit_active_or_pending(Unit
*u
) {
3825 /* Returns true if the unit is active or going up */
3827 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3831 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3837 bool unit_will_restart(Unit
*u
) {
3840 if (!UNIT_VTABLE(u
)->will_restart
)
3843 return UNIT_VTABLE(u
)->will_restart(u
);
3846 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3848 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3849 assert(SIGNAL_VALID(signo
));
3851 if (!UNIT_VTABLE(u
)->kill
)
3854 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3857 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3861 pid_set
= set_new(NULL
);
3865 /* Exclude the main/control pids from being killed via the cgroup */
3867 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3872 if (control_pid
> 0) {
3873 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3885 int unit_kill_common(
3891 sd_bus_error
*error
) {
3894 bool killed
= false;
3896 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3898 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3899 else if (main_pid
== 0)
3900 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3903 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3904 if (control_pid
< 0)
3905 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3906 else if (control_pid
== 0)
3907 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3910 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3911 if (control_pid
> 0) {
3912 if (kill(control_pid
, signo
) < 0)
3918 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3920 if (kill(main_pid
, signo
) < 0)
3926 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3927 _cleanup_set_free_ Set
*pid_set
= NULL
;
3930 /* Exclude the main/control pids from being killed via the cgroup */
3931 pid_set
= unit_pid_set(main_pid
, control_pid
);
3935 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, NULL
, NULL
);
3936 if (q
< 0 && !IN_SET(q
, -EAGAIN
, -ESRCH
, -ENOENT
))
3942 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
))
3948 int unit_following_set(Unit
*u
, Set
**s
) {
3952 if (UNIT_VTABLE(u
)->following_set
)
3953 return UNIT_VTABLE(u
)->following_set(u
, s
);
3959 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3964 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3965 r
= unit_file_get_state(
3966 u
->manager
->unit_file_scope
,
3969 &u
->unit_file_state
);
3971 u
->unit_file_state
= UNIT_FILE_BAD
;
3974 return u
->unit_file_state
;
3977 int unit_get_unit_file_preset(Unit
*u
) {
3980 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3981 u
->unit_file_preset
= unit_file_query_preset(
3982 u
->manager
->unit_file_scope
,
3984 basename(u
->fragment_path
));
3986 return u
->unit_file_preset
;
3989 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*u
) {
3994 unit_ref_unset(ref
);
3997 LIST_PREPEND(refs
, u
->refs
, ref
);
4001 void unit_ref_unset(UnitRef
*ref
) {
4007 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4008 * be unreferenced now. */
4009 unit_add_to_gc_queue(ref
->unit
);
4011 LIST_REMOVE(refs
, ref
->unit
->refs
, ref
);
4015 static int user_from_unit_name(Unit
*u
, char **ret
) {
4017 static const uint8_t hash_key
[] = {
4018 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4019 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4022 _cleanup_free_
char *n
= NULL
;
4025 r
= unit_name_to_prefix(u
->id
, &n
);
4029 if (valid_user_group_name(n
)) {
4035 /* If we can't use the unit name as a user name, then let's hash it and use that */
4036 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4042 int unit_patch_contexts(Unit
*u
) {
4050 /* Patch in the manager defaults into the exec and cgroup
4051 * contexts, _after_ the rest of the settings have been
4054 ec
= unit_get_exec_context(u
);
4056 /* This only copies in the ones that need memory */
4057 for (i
= 0; i
< _RLIMIT_MAX
; i
++)
4058 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4059 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4064 if (MANAGER_IS_USER(u
->manager
) &&
4065 !ec
->working_directory
) {
4067 r
= get_home_dir(&ec
->working_directory
);
4071 /* Allow user services to run, even if the
4072 * home directory is missing */
4073 ec
->working_directory_missing_ok
= true;
4076 if (ec
->private_devices
)
4077 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4079 if (ec
->protect_kernel_modules
)
4080 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4082 if (ec
->dynamic_user
) {
4084 r
= user_from_unit_name(u
, &ec
->user
);
4090 ec
->group
= strdup(ec
->user
);
4095 /* If the dynamic user option is on, let's make sure that the unit can't leave its UID/GID
4096 * around in the file system or on IPC objects. Hence enforce a strict sandbox. */
4098 ec
->private_tmp
= true;
4099 ec
->remove_ipc
= true;
4100 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4101 if (ec
->protect_home
== PROTECT_HOME_NO
)
4102 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4106 cc
= unit_get_cgroup_context(u
);
4110 ec
->private_devices
&&
4111 cc
->device_policy
== CGROUP_AUTO
)
4112 cc
->device_policy
= CGROUP_CLOSED
;
4118 ExecContext
*unit_get_exec_context(Unit
*u
) {
4125 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4129 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4132 KillContext
*unit_get_kill_context(Unit
*u
) {
4139 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4143 return (KillContext
*) ((uint8_t*) u
+ offset
);
4146 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4152 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4156 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4159 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4165 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4169 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4172 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4175 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4178 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4179 return u
->manager
->lookup_paths
.transient
;
4181 if (flags
& UNIT_PERSISTENT
)
4182 return u
->manager
->lookup_paths
.persistent_control
;
4184 if (flags
& UNIT_RUNTIME
)
4185 return u
->manager
->lookup_paths
.runtime_control
;
4190 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4196 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4197 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4198 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4199 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4200 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4203 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4204 ret
= specifier_escape(s
);
4211 if (flags
& UNIT_ESCAPE_C
) {
4224 return ret
?: (char*) s
;
4227 return ret
?: strdup(s
);
4230 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4231 _cleanup_free_
char *result
= NULL
;
4232 size_t n
= 0, allocated
= 0;
4235 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4236 * way suitable for ExecStart= stanzas */
4238 STRV_FOREACH(i
, l
) {
4239 _cleanup_free_
char *buf
= NULL
;
4244 p
= unit_escape_setting(*i
, flags
, &buf
);
4248 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4249 if (!GREEDY_REALLOC(result
, allocated
, n
+ a
+ 1))
4263 if (!GREEDY_REALLOC(result
, allocated
, n
+ 1))
4274 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4275 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4276 const char *dir
, *wrapped
;
4283 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4286 data
= unit_escape_setting(data
, flags
, &escaped
);
4290 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4291 * previous section header is the same */
4293 if (flags
& UNIT_PRIVATE
) {
4294 if (!UNIT_VTABLE(u
)->private_section
)
4297 if (!u
->transient_file
|| u
->last_section_private
< 0)
4298 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4299 else if (u
->last_section_private
== 0)
4300 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4302 if (!u
->transient_file
|| u
->last_section_private
< 0)
4303 data
= strjoina("[Unit]\n", data
);
4304 else if (u
->last_section_private
> 0)
4305 data
= strjoina("\n[Unit]\n", data
);
4308 if (u
->transient_file
) {
4309 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4310 * write to the transient unit file. */
4311 fputs(data
, u
->transient_file
);
4313 if (!endswith(data
, "\n"))
4314 fputc('\n', u
->transient_file
);
4316 /* Remember which section we wrote this entry to */
4317 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4321 dir
= unit_drop_in_dir(u
, flags
);
4325 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4326 "# or an equivalent operation. Do not edit.\n",
4330 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4334 (void) mkdir_p_label(p
, 0755);
4335 r
= write_string_file_atomic_label(q
, wrapped
);
4339 r
= strv_push(&u
->dropin_paths
, q
);
4344 strv_uniq(u
->dropin_paths
);
4346 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4351 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4352 _cleanup_free_
char *p
= NULL
;
4360 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4363 va_start(ap
, format
);
4364 r
= vasprintf(&p
, format
, ap
);
4370 return unit_write_setting(u
, flags
, name
, p
);
4373 int unit_make_transient(Unit
*u
) {
4374 _cleanup_free_
char *path
= NULL
;
4379 if (!UNIT_VTABLE(u
)->can_transient
)
4382 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4384 path
= strjoin(u
->manager
->lookup_paths
.transient
, "/", u
->id
);
4388 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4389 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4391 RUN_WITH_UMASK(0022) {
4392 f
= fopen(path
, "we");
4397 safe_fclose(u
->transient_file
);
4398 u
->transient_file
= f
;
4400 free_and_replace(u
->fragment_path
, path
);
4402 u
->source_path
= mfree(u
->source_path
);
4403 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4404 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4406 u
->load_state
= UNIT_STUB
;
4408 u
->transient
= true;
4410 unit_add_to_dbus_queue(u
);
4411 unit_add_to_gc_queue(u
);
4413 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4419 static void log_kill(pid_t pid
, int sig
, void *userdata
) {
4420 _cleanup_free_
char *comm
= NULL
;
4422 (void) get_process_comm(pid
, &comm
);
4424 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4425 only, like for example systemd's own PAM stub process. */
4426 if (comm
&& comm
[0] == '(')
4429 log_unit_notice(userdata
,
4430 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4433 signal_to_string(sig
));
4436 static int operation_to_signal(KillContext
*c
, KillOperation k
) {
4441 case KILL_TERMINATE
:
4442 case KILL_TERMINATE_AND_LOG
:
4443 return c
->kill_signal
;
4452 assert_not_reached("KillOperation unknown");
4456 int unit_kill_context(
4462 bool main_pid_alien
) {
4464 bool wait_for_exit
= false, send_sighup
;
4465 cg_kill_log_func_t log_func
= NULL
;
4471 /* Kill the processes belonging to this unit, in preparation for shutting the unit down.
4472 * Returns > 0 if we killed something worth waiting for, 0 otherwise. */
4474 if (c
->kill_mode
== KILL_NONE
)
4477 sig
= operation_to_signal(c
, k
);
4481 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4484 if (k
!= KILL_TERMINATE
|| IN_SET(sig
, SIGKILL
, SIGABRT
))
4485 log_func
= log_kill
;
4489 log_func(main_pid
, sig
, u
);
4491 r
= kill_and_sigcont(main_pid
, sig
);
4492 if (r
< 0 && r
!= -ESRCH
) {
4493 _cleanup_free_
char *comm
= NULL
;
4494 (void) get_process_comm(main_pid
, &comm
);
4496 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4498 if (!main_pid_alien
)
4499 wait_for_exit
= true;
4501 if (r
!= -ESRCH
&& send_sighup
)
4502 (void) kill(main_pid
, SIGHUP
);
4506 if (control_pid
> 0) {
4508 log_func(control_pid
, sig
, u
);
4510 r
= kill_and_sigcont(control_pid
, sig
);
4511 if (r
< 0 && r
!= -ESRCH
) {
4512 _cleanup_free_
char *comm
= NULL
;
4513 (void) get_process_comm(control_pid
, &comm
);
4515 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4517 wait_for_exit
= true;
4519 if (r
!= -ESRCH
&& send_sighup
)
4520 (void) kill(control_pid
, SIGHUP
);
4524 if (u
->cgroup_path
&&
4525 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4526 _cleanup_set_free_ Set
*pid_set
= NULL
;
4528 /* Exclude the main/control pids from being killed via the cgroup */
4529 pid_set
= unit_pid_set(main_pid
, control_pid
);
4533 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4535 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4539 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4540 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4544 /* FIXME: For now, on the legacy hierarchy, we
4545 * will not wait for the cgroup members to die
4546 * if we are running in a container or if this
4547 * is a delegation unit, simply because cgroup
4548 * notification is unreliable in these
4549 * cases. It doesn't work at all in
4550 * containers, and outside of containers it
4551 * can be confused easily by left-over
4552 * directories in the cgroup — which however
4553 * should not exist in non-delegated units. On
4554 * the unified hierarchy that's different,
4555 * there we get proper events. Hence rely on
4558 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4559 (detect_container() == 0 && !UNIT_CGROUP_BOOL(u
, delegate
)))
4560 wait_for_exit
= true;
4565 pid_set
= unit_pid_set(main_pid
, control_pid
);
4569 cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4578 return wait_for_exit
;
4581 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4582 char prefix
[strlen(path
) + 1], *p
;
4583 UnitDependencyInfo di
;
4589 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these paths in
4590 * the unit (from the path to the UnitDependencyInfo structure indicating how to the dependency came to
4591 * be). However, we build a prefix table for all possible prefixes so that new appearing mount units can easily
4592 * determine which units to make themselves a dependency of. */
4594 if (!path_is_absolute(path
))
4597 r
= hashmap_ensure_allocated(&u
->requires_mounts_for
, &string_hash_ops
);
4605 path_kill_slashes(p
);
4607 if (!path_is_normalized(p
)) {
4612 if (hashmap_contains(u
->requires_mounts_for
, p
)) {
4617 di
= (UnitDependencyInfo
) {
4621 r
= hashmap_put(u
->requires_mounts_for
, p
, di
.data
);
4627 PATH_FOREACH_PREFIX_MORE(prefix
, p
) {
4630 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4634 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &string_hash_ops
);
4648 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4664 int unit_setup_exec_runtime(Unit
*u
) {
4672 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4675 /* Check if there already is an ExecRuntime for this unit? */
4676 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4680 /* Try to get it from somebody else */
4681 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_JOINS_NAMESPACE_OF
], i
) {
4682 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4687 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4690 int unit_setup_dynamic_creds(Unit
*u
) {
4692 DynamicCreds
*dcreds
;
4697 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4699 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4701 ec
= unit_get_exec_context(u
);
4704 if (!ec
->dynamic_user
)
4707 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4710 bool unit_type_supported(UnitType t
) {
4711 if (_unlikely_(t
< 0))
4713 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4716 if (!unit_vtable
[t
]->supported
)
4719 return unit_vtable
[t
]->supported();
4722 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4728 r
= dir_is_empty(where
);
4729 if (r
> 0 || r
== -ENOTDIR
)
4732 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4736 log_struct(LOG_NOTICE
,
4737 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4739 LOG_UNIT_INVOCATION_ID(u
),
4740 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4745 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4746 _cleanup_free_
char *canonical_where
;
4752 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
);
4754 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4758 /* We will happily ignore a trailing slash (or any redundant slashes) */
4759 if (path_equal(where
, canonical_where
))
4762 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4764 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4766 LOG_UNIT_INVOCATION_ID(u
),
4767 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4774 bool unit_is_pristine(Unit
*u
) {
4777 /* Check if the unit already exists or is already around,
4778 * in a number of different ways. Note that to cater for unit
4779 * types such as slice, we are generally fine with units that
4780 * are marked UNIT_LOADED even though nothing was
4781 * actually loaded, as those unit types don't require a file
4782 * on disk to validly load. */
4784 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4787 !strv_isempty(u
->dropin_paths
) ||
4792 pid_t
unit_control_pid(Unit
*u
) {
4795 if (UNIT_VTABLE(u
)->control_pid
)
4796 return UNIT_VTABLE(u
)->control_pid(u
);
4801 pid_t
unit_main_pid(Unit
*u
) {
4804 if (UNIT_VTABLE(u
)->main_pid
)
4805 return UNIT_VTABLE(u
)->main_pid(u
);
4810 static void unit_unref_uid_internal(
4814 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4818 assert(_manager_unref_uid
);
4820 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4821 * gid_t are actually the same time, with the same validity rules.
4823 * Drops a reference to UID/GID from a unit. */
4825 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4826 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4828 if (!uid_is_valid(*ref_uid
))
4831 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4832 *ref_uid
= UID_INVALID
;
4835 void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4836 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4839 void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4840 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4843 static int unit_ref_uid_internal(
4848 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4854 assert(uid_is_valid(uid
));
4855 assert(_manager_ref_uid
);
4857 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4858 * are actually the same type, and have the same validity rules.
4860 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4861 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4864 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4865 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4867 if (*ref_uid
== uid
)
4870 if (uid_is_valid(*ref_uid
)) /* Already set? */
4873 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4881 int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4882 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4885 int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4886 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4889 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4894 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4896 if (uid_is_valid(uid
)) {
4897 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4902 if (gid_is_valid(gid
)) {
4903 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4906 unit_unref_uid(u
, false);
4912 return r
> 0 || q
> 0;
4915 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4921 c
= unit_get_exec_context(u
);
4923 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4925 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4930 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4933 unit_unref_uid(u
, destroy_now
);
4934 unit_unref_gid(u
, destroy_now
);
4937 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4942 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4943 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4944 * objects when no service references the UID/GID anymore. */
4946 r
= unit_ref_uid_gid(u
, uid
, gid
);
4948 bus_unit_send_change_signal(u
);
4951 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
4956 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
4958 if (sd_id128_equal(u
->invocation_id
, id
))
4961 if (!sd_id128_is_null(u
->invocation_id
))
4962 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4964 if (sd_id128_is_null(id
)) {
4969 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
4973 u
->invocation_id
= id
;
4974 sd_id128_to_string(id
, u
->invocation_id_string
);
4976 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4983 u
->invocation_id
= SD_ID128_NULL
;
4984 u
->invocation_id_string
[0] = 0;
4988 int unit_acquire_invocation_id(Unit
*u
) {
4994 r
= sd_id128_randomize(&id
);
4996 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4998 r
= unit_set_invocation_id(u
, id
);
5000 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5005 void unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5009 p
->cgroup_path
= u
->cgroup_path
;
5010 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, UNIT_CGROUP_BOOL(u
, delegate
));
5013 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5019 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5020 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5022 (void) unit_realize_cgroup(u
);
5024 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5028 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
, -1);
5029 (void) ignore_signals(SIGPIPE
, -1);
5031 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5033 if (u
->cgroup_path
) {
5034 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5036 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5044 static void unit_update_dependency_mask(Unit
*u
, UnitDependency d
, Unit
*other
, UnitDependencyInfo di
) {
5047 assert(d
< _UNIT_DEPENDENCY_MAX
);
5050 if (di
.origin_mask
== 0 && di
.destination_mask
== 0) {
5051 /* No bit set anymore, let's drop the whole entry */
5052 assert_se(hashmap_remove(u
->dependencies
[d
], other
));
5053 log_unit_debug(u
, "%s lost dependency %s=%s", u
->id
, unit_dependency_to_string(d
), other
->id
);
5055 /* Mask was reduced, let's update the entry */
5056 assert_se(hashmap_update(u
->dependencies
[d
], other
, di
.data
) == 0);
5059 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5064 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5069 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
5073 UnitDependencyInfo di
;
5079 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
5082 if ((di
.origin_mask
& ~mask
) == di
.origin_mask
)
5084 di
.origin_mask
&= ~mask
;
5085 unit_update_dependency_mask(u
, d
, other
, di
);
5087 /* We updated the dependency from our unit to the other unit now. But most dependencies
5088 * imply a reverse dependency. Hence, let's delete that one too. For that we go through
5089 * all dependency types on the other unit and delete all those which point to us and
5090 * have the right mask set. */
5092 for (q
= 0; q
< _UNIT_DEPENDENCY_MAX
; q
++) {
5093 UnitDependencyInfo dj
;
5095 dj
.data
= hashmap_get(other
->dependencies
[q
], u
);
5096 if ((dj
.destination_mask
& ~mask
) == dj
.destination_mask
)
5098 dj
.destination_mask
&= ~mask
;
5100 unit_update_dependency_mask(other
, q
, u
, dj
);
5103 unit_add_to_gc_queue(other
);
5113 static int unit_export_invocation_id(Unit
*u
) {
5119 if (u
->exported_invocation_id
)
5122 if (sd_id128_is_null(u
->invocation_id
))
5125 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5126 r
= symlink_atomic(u
->invocation_id_string
, p
);
5128 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5130 u
->exported_invocation_id
= true;
5134 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5142 if (u
->exported_log_level_max
)
5145 if (c
->log_level_max
< 0)
5148 assert(c
->log_level_max
<= 7);
5150 buf
[0] = '0' + c
->log_level_max
;
5153 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5154 r
= symlink_atomic(buf
, p
);
5156 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5158 u
->exported_log_level_max
= true;
5162 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5163 _cleanup_close_
int fd
= -1;
5164 struct iovec
*iovec
;
5172 if (u
->exported_log_extra_fields
)
5175 if (c
->n_log_extra_fields
<= 0)
5178 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5179 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5181 for (i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5182 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5184 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5185 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5188 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5189 pattern
= strjoina(p
, ".XXXXXX");
5191 fd
= mkostemp_safe(pattern
);
5193 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5195 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5197 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5201 (void) fchmod(fd
, 0644);
5203 if (rename(pattern
, p
) < 0) {
5204 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5208 u
->exported_log_extra_fields
= true;
5212 (void) unlink(pattern
);
5216 void unit_export_state_files(Unit
*u
) {
5217 const ExecContext
*c
;
5224 if (!MANAGER_IS_SYSTEM(u
->manager
))
5227 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5228 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5229 * the IPC system itself and PID 1 also log to the journal.
5231 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5232 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5233 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5234 * namespace at least.
5236 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5237 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5240 (void) unit_export_invocation_id(u
);
5242 c
= unit_get_exec_context(u
);
5244 (void) unit_export_log_level_max(u
, c
);
5245 (void) unit_export_log_extra_fields(u
, c
);
5249 void unit_unlink_state_files(Unit
*u
) {
5257 if (!MANAGER_IS_SYSTEM(u
->manager
))
5260 /* Undoes the effect of unit_export_state() */
5262 if (u
->exported_invocation_id
) {
5263 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5266 u
->exported_invocation_id
= false;
5269 if (u
->exported_log_level_max
) {
5270 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5273 u
->exported_log_level_max
= false;
5276 if (u
->exported_log_extra_fields
) {
5277 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5280 u
->exported_log_extra_fields
= false;
5284 int unit_prepare_exec(Unit
*u
) {
5289 /* Prepares everything so that we can fork of a process for this unit */
5291 (void) unit_realize_cgroup(u
);
5293 if (u
->reset_accounting
) {
5294 (void) unit_reset_cpu_accounting(u
);
5295 (void) unit_reset_ip_accounting(u
);
5296 u
->reset_accounting
= false;
5299 unit_export_state_files(u
);
5301 r
= unit_setup_exec_runtime(u
);
5305 r
= unit_setup_dynamic_creds(u
);
5312 static void log_leftover(pid_t pid
, int sig
, void *userdata
) {
5313 _cleanup_free_
char *comm
= NULL
;
5315 (void) get_process_comm(pid
, &comm
);
5317 if (comm
&& comm
[0] == '(') /* Most likely our own helper process (PAM?), ignore */
5320 log_unit_warning(userdata
,
5321 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5322 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5326 void unit_warn_leftover_processes(Unit
*u
) {
5329 (void) unit_pick_cgroup_path(u
);
5331 if (!u
->cgroup_path
)
5334 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_leftover
, u
);
5337 bool unit_needs_console(Unit
*u
) {
5339 UnitActiveState state
;
5343 state
= unit_active_state(u
);
5345 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5348 if (UNIT_VTABLE(u
)->needs_console
)
5349 return UNIT_VTABLE(u
)->needs_console(u
);
5351 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5352 ec
= unit_get_exec_context(u
);
5356 return exec_context_may_touch_console(ec
);
5359 const char *unit_label_path(Unit
*u
) {
5362 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5363 * when validating access checks. */
5365 p
= u
->source_path
?: u
->fragment_path
;
5369 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5370 if (path_equal(p
, "/dev/null"))
5376 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5377 [COLLECT_INACTIVE
] = "inactive",
5378 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5381 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);