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_SHARED
: 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.
349 * References from other units are *not* checked here. Instead, this is done
350 * in unit_gc_sweep(), but using markers to properly collect dependency loops.
359 state
= unit_active_state(u
);
361 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
362 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
363 UNIT_VTABLE(u
)->release_resources
)
364 UNIT_VTABLE(u
)->release_resources(u
);
369 if (sd_bus_track_count(u
->bus_track
) > 0)
372 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
373 switch (u
->collect_mode
) {
375 case COLLECT_INACTIVE
:
376 if (state
!= UNIT_INACTIVE
)
381 case COLLECT_INACTIVE_OR_FAILED
:
382 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
388 assert_not_reached("Unknown garbage collection mode");
391 if (u
->cgroup_path
) {
392 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
393 * around. Units with active processes should never be collected. */
395 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
397 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
402 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_gc(u
))
408 void unit_add_to_load_queue(Unit
*u
) {
410 assert(u
->type
!= _UNIT_TYPE_INVALID
);
412 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
415 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
416 u
->in_load_queue
= true;
419 void unit_add_to_cleanup_queue(Unit
*u
) {
422 if (u
->in_cleanup_queue
)
425 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
426 u
->in_cleanup_queue
= true;
429 void unit_add_to_gc_queue(Unit
*u
) {
432 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
438 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
439 u
->in_gc_queue
= true;
442 void unit_add_to_dbus_queue(Unit
*u
) {
444 assert(u
->type
!= _UNIT_TYPE_INVALID
);
446 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
449 /* Shortcut things if nobody cares */
450 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
451 sd_bus_track_count(u
->bus_track
) <= 0 &&
452 set_isempty(u
->manager
->private_buses
)) {
453 u
->sent_dbus_new_signal
= true;
457 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
458 u
->in_dbus_queue
= true;
461 static void bidi_set_free(Unit
*u
, Hashmap
*h
) {
468 /* Frees the hashmap and makes sure we are dropped from the inverse pointers */
470 HASHMAP_FOREACH_KEY(v
, other
, h
, i
) {
473 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
474 hashmap_remove(other
->dependencies
[d
], u
);
476 unit_add_to_gc_queue(other
);
482 static void unit_remove_transient(Unit
*u
) {
490 if (u
->fragment_path
)
491 (void) unlink(u
->fragment_path
);
493 STRV_FOREACH(i
, u
->dropin_paths
) {
494 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
496 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
500 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
504 /* Only drop transient drop-ins */
505 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
513 static void unit_free_requires_mounts_for(Unit
*u
) {
517 _cleanup_free_
char *path
;
519 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
523 char s
[strlen(path
) + 1];
525 PATH_FOREACH_PREFIX_MORE(s
, path
) {
529 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
533 (void) set_remove(x
, u
);
535 if (set_isempty(x
)) {
536 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
544 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
547 static void unit_done(Unit
*u
) {
556 if (UNIT_VTABLE(u
)->done
)
557 UNIT_VTABLE(u
)->done(u
);
559 ec
= unit_get_exec_context(u
);
561 exec_context_done(ec
);
563 cc
= unit_get_cgroup_context(u
);
565 cgroup_context_done(cc
);
568 void unit_free(Unit
*u
) {
576 u
->transient_file
= safe_fclose(u
->transient_file
);
578 if (!MANAGER_IS_RELOADING(u
->manager
))
579 unit_remove_transient(u
);
581 bus_unit_send_removed_signal(u
);
585 sd_bus_slot_unref(u
->match_bus_slot
);
587 sd_bus_track_unref(u
->bus_track
);
588 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
590 unit_free_requires_mounts_for(u
);
592 SET_FOREACH(t
, u
->names
, i
)
593 hashmap_remove_value(u
->manager
->units
, t
, u
);
595 if (!sd_id128_is_null(u
->invocation_id
))
596 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
610 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
611 bidi_set_free(u
, u
->dependencies
[d
]);
614 manager_unref_console(u
->manager
);
616 unit_release_cgroup(u
);
618 if (!MANAGER_IS_RELOADING(u
->manager
))
619 unit_unlink_state_files(u
);
621 unit_unref_uid_gid(u
, false);
623 (void) manager_update_failed_units(u
->manager
, u
, false);
624 set_remove(u
->manager
->startup_units
, u
);
626 unit_unwatch_all_pids(u
);
628 unit_ref_unset(&u
->slice
);
629 while (u
->refs_by_target
)
630 unit_ref_unset(u
->refs_by_target
);
632 if (u
->type
!= _UNIT_TYPE_INVALID
)
633 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
635 if (u
->in_load_queue
)
636 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
638 if (u
->in_dbus_queue
)
639 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
642 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
644 if (u
->in_cgroup_realize_queue
)
645 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
647 if (u
->in_cgroup_empty_queue
)
648 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
650 if (u
->in_cleanup_queue
)
651 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
653 safe_close(u
->ip_accounting_ingress_map_fd
);
654 safe_close(u
->ip_accounting_egress_map_fd
);
656 safe_close(u
->ipv4_allow_map_fd
);
657 safe_close(u
->ipv6_allow_map_fd
);
658 safe_close(u
->ipv4_deny_map_fd
);
659 safe_close(u
->ipv6_deny_map_fd
);
661 bpf_program_unref(u
->ip_bpf_ingress
);
662 bpf_program_unref(u
->ip_bpf_ingress_installed
);
663 bpf_program_unref(u
->ip_bpf_egress
);
664 bpf_program_unref(u
->ip_bpf_egress_installed
);
666 condition_free_list(u
->conditions
);
667 condition_free_list(u
->asserts
);
669 free(u
->description
);
670 strv_free(u
->documentation
);
671 free(u
->fragment_path
);
672 free(u
->source_path
);
673 strv_free(u
->dropin_paths
);
676 free(u
->job_timeout_reboot_arg
);
678 set_free_free(u
->names
);
685 UnitActiveState
unit_active_state(Unit
*u
) {
688 if (u
->load_state
== UNIT_MERGED
)
689 return unit_active_state(unit_follow_merge(u
));
691 /* After a reload it might happen that a unit is not correctly
692 * loaded but still has a process around. That's why we won't
693 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
695 return UNIT_VTABLE(u
)->active_state(u
);
698 const char* unit_sub_state_to_string(Unit
*u
) {
701 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
704 static int set_complete_move(Set
**s
, Set
**other
) {
712 return set_move(*s
, *other
);
721 static int hashmap_complete_move(Hashmap
**s
, Hashmap
**other
) {
729 return hashmap_move(*s
, *other
);
738 static int merge_names(Unit
*u
, Unit
*other
) {
746 r
= set_complete_move(&u
->names
, &other
->names
);
750 set_free_free(other
->names
);
754 SET_FOREACH(t
, u
->names
, i
)
755 assert_se(hashmap_replace(u
->manager
->units
, t
, u
) == 0);
760 static int reserve_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
765 assert(d
< _UNIT_DEPENDENCY_MAX
);
768 * If u does not have this dependency set allocated, there is no need
769 * to reserve anything. In that case other's set will be transferred
770 * as a whole to u by complete_move().
772 if (!u
->dependencies
[d
])
775 /* merge_dependencies() will skip a u-on-u dependency */
776 n_reserve
= hashmap_size(other
->dependencies
[d
]) - !!hashmap_get(other
->dependencies
[d
], u
);
778 return hashmap_reserve(u
->dependencies
[d
], n_reserve
);
781 static void merge_dependencies(Unit
*u
, Unit
*other
, const char *other_id
, UnitDependency d
) {
787 /* Merges all dependencies of type 'd' of the unit 'other' into the deps of the unit 'u' */
791 assert(d
< _UNIT_DEPENDENCY_MAX
);
793 /* Fix backwards pointers. Let's iterate through all dependendent units of the other unit. */
794 HASHMAP_FOREACH_KEY(v
, back
, other
->dependencies
[d
], i
) {
797 /* Let's now iterate through the dependencies of that dependencies of the other units, looking for
798 * pointers back, and let's fix them up, to instead point to 'u'. */
800 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++) {
802 /* Do not add dependencies between u and itself. */
803 if (hashmap_remove(back
->dependencies
[k
], other
))
804 maybe_warn_about_dependency(u
, other_id
, k
);
806 UnitDependencyInfo di_u
, di_other
, di_merged
;
808 /* Let's drop this dependency between "back" and "other", and let's create it between
809 * "back" and "u" instead. Let's merge the bit masks of the dependency we are moving,
810 * and any such dependency which might already exist */
812 di_other
.data
= hashmap_get(back
->dependencies
[k
], other
);
814 continue; /* dependency isn't set, let's try the next one */
816 di_u
.data
= hashmap_get(back
->dependencies
[k
], u
);
818 di_merged
= (UnitDependencyInfo
) {
819 .origin_mask
= di_u
.origin_mask
| di_other
.origin_mask
,
820 .destination_mask
= di_u
.destination_mask
| di_other
.destination_mask
,
823 r
= hashmap_remove_and_replace(back
->dependencies
[k
], other
, u
, di_merged
.data
);
825 log_warning_errno(r
, "Failed to remove/replace: back=%s other=%s u=%s: %m", back
->id
, other_id
, u
->id
);
828 /* assert_se(hashmap_remove_and_replace(back->dependencies[k], other, u, di_merged.data) >= 0); */
834 /* Also do not move dependencies on u to itself */
835 back
= hashmap_remove(other
->dependencies
[d
], u
);
837 maybe_warn_about_dependency(u
, other_id
, d
);
839 /* The move cannot fail. The caller must have performed a reservation. */
840 assert_se(hashmap_complete_move(&u
->dependencies
[d
], &other
->dependencies
[d
]) == 0);
842 other
->dependencies
[d
] = hashmap_free(other
->dependencies
[d
]);
845 int unit_merge(Unit
*u
, Unit
*other
) {
847 const char *other_id
= NULL
;
852 assert(u
->manager
== other
->manager
);
853 assert(u
->type
!= _UNIT_TYPE_INVALID
);
855 other
= unit_follow_merge(other
);
860 if (u
->type
!= other
->type
)
863 if (!u
->instance
!= !other
->instance
)
866 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
869 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
878 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
882 other_id
= strdupa(other
->id
);
884 /* Make reservations to ensure merge_dependencies() won't fail */
885 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
886 r
= reserve_dependencies(u
, other
, d
);
888 * We don't rollback reservations if we fail. We don't have
889 * a way to undo reservations. A reservation is not a leak.
896 r
= merge_names(u
, other
);
900 /* Redirect all references */
901 while (other
->refs_by_target
)
902 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
904 /* Merge dependencies */
905 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
906 merge_dependencies(u
, other
, other_id
, d
);
908 other
->load_state
= UNIT_MERGED
;
909 other
->merged_into
= u
;
911 /* If there is still some data attached to the other node, we
912 * don't need it anymore, and can free it. */
913 if (other
->load_state
!= UNIT_STUB
)
914 if (UNIT_VTABLE(other
)->done
)
915 UNIT_VTABLE(other
)->done(other
);
917 unit_add_to_dbus_queue(u
);
918 unit_add_to_cleanup_queue(other
);
923 int unit_merge_by_name(Unit
*u
, const char *name
) {
924 _cleanup_free_
char *s
= NULL
;
931 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
935 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
942 other
= manager_get_unit(u
->manager
, name
);
944 return unit_merge(u
, other
);
946 return unit_add_name(u
, name
);
949 Unit
* unit_follow_merge(Unit
*u
) {
952 while (u
->load_state
== UNIT_MERGED
)
953 assert_se(u
= u
->merged_into
);
958 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
959 ExecDirectoryType dt
;
966 if (c
->working_directory
) {
967 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
972 if (c
->root_directory
) {
973 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
979 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
984 for (dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
985 if (!u
->manager
->prefix
[dt
])
988 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
989 _cleanup_free_
char *p
;
991 p
= strjoin(u
->manager
->prefix
[dt
], "/", *dp
);
995 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1001 if (!MANAGER_IS_SYSTEM(u
->manager
))
1004 if (c
->private_tmp
) {
1007 FOREACH_STRING(p
, "/tmp", "/var/tmp") {
1008 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1013 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, NULL
, true, UNIT_DEPENDENCY_FILE
);
1018 if (!IN_SET(c
->std_output
,
1019 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1020 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1021 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
) &&
1022 !IN_SET(c
->std_error
,
1023 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1024 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1025 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
))
1028 /* If syslog or kernel logging is requested, make sure our own
1029 * logging daemon is run first. */
1031 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, NULL
, true, UNIT_DEPENDENCY_FILE
);
1038 const char *unit_description(Unit
*u
) {
1042 return u
->description
;
1044 return strna(u
->id
);
1047 static void print_unit_dependency_mask(FILE *f
, const char *kind
, UnitDependencyMask mask
, bool *space
) {
1049 UnitDependencyMask mask
;
1052 { UNIT_DEPENDENCY_FILE
, "file" },
1053 { UNIT_DEPENDENCY_IMPLICIT
, "implicit" },
1054 { UNIT_DEPENDENCY_DEFAULT
, "default" },
1055 { UNIT_DEPENDENCY_UDEV
, "udev" },
1056 { UNIT_DEPENDENCY_PATH
, "path" },
1057 { UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
, "mountinfo-implicit" },
1058 { UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
, "mountinfo-default" },
1059 { UNIT_DEPENDENCY_PROC_SWAP
, "proc-swap" },
1067 for (i
= 0; i
< ELEMENTSOF(table
); i
++) {
1072 if ((mask
& table
[i
].mask
) == table
[i
].mask
) {
1080 fputs(table
[i
].name
, f
);
1082 mask
&= ~table
[i
].mask
;
1089 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
1093 const char *prefix2
;
1095 timestamp0
[FORMAT_TIMESTAMP_MAX
],
1096 timestamp1
[FORMAT_TIMESTAMP_MAX
],
1097 timestamp2
[FORMAT_TIMESTAMP_MAX
],
1098 timestamp3
[FORMAT_TIMESTAMP_MAX
],
1099 timestamp4
[FORMAT_TIMESTAMP_MAX
],
1100 timespan
[FORMAT_TIMESPAN_MAX
];
1102 _cleanup_set_free_ Set
*following_set
= NULL
;
1108 assert(u
->type
>= 0);
1110 prefix
= strempty(prefix
);
1111 prefix2
= strjoina(prefix
, "\t");
1115 "%s\tDescription: %s\n"
1116 "%s\tInstance: %s\n"
1117 "%s\tUnit Load State: %s\n"
1118 "%s\tUnit Active State: %s\n"
1119 "%s\tState Change Timestamp: %s\n"
1120 "%s\tInactive Exit Timestamp: %s\n"
1121 "%s\tActive Enter Timestamp: %s\n"
1122 "%s\tActive Exit Timestamp: %s\n"
1123 "%s\tInactive Enter Timestamp: %s\n"
1125 "%s\tNeed Daemon Reload: %s\n"
1126 "%s\tTransient: %s\n"
1127 "%s\tPerpetual: %s\n"
1128 "%s\tGarbage Collection Mode: %s\n"
1131 "%s\tCGroup realized: %s\n",
1133 prefix
, unit_description(u
),
1134 prefix
, strna(u
->instance
),
1135 prefix
, unit_load_state_to_string(u
->load_state
),
1136 prefix
, unit_active_state_to_string(unit_active_state(u
)),
1137 prefix
, strna(format_timestamp(timestamp0
, sizeof(timestamp0
), u
->state_change_timestamp
.realtime
)),
1138 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->inactive_exit_timestamp
.realtime
)),
1139 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->active_enter_timestamp
.realtime
)),
1140 prefix
, strna(format_timestamp(timestamp3
, sizeof(timestamp3
), u
->active_exit_timestamp
.realtime
)),
1141 prefix
, strna(format_timestamp(timestamp4
, sizeof(timestamp4
), u
->inactive_enter_timestamp
.realtime
)),
1142 prefix
, yes_no(unit_may_gc(u
)),
1143 prefix
, yes_no(unit_need_daemon_reload(u
)),
1144 prefix
, yes_no(u
->transient
),
1145 prefix
, yes_no(u
->perpetual
),
1146 prefix
, collect_mode_to_string(u
->collect_mode
),
1147 prefix
, strna(unit_slice_name(u
)),
1148 prefix
, strna(u
->cgroup_path
),
1149 prefix
, yes_no(u
->cgroup_realized
));
1151 if (u
->cgroup_realized_mask
!= 0) {
1152 _cleanup_free_
char *s
= NULL
;
1153 (void) cg_mask_to_string(u
->cgroup_realized_mask
, &s
);
1154 fprintf(f
, "%s\tCGroup realized mask: %s\n", prefix
, strnull(s
));
1156 if (u
->cgroup_enabled_mask
!= 0) {
1157 _cleanup_free_
char *s
= NULL
;
1158 (void) cg_mask_to_string(u
->cgroup_enabled_mask
, &s
);
1159 fprintf(f
, "%s\tCGroup enabled mask: %s\n", prefix
, strnull(s
));
1161 m
= unit_get_own_mask(u
);
1163 _cleanup_free_
char *s
= NULL
;
1164 (void) cg_mask_to_string(m
, &s
);
1165 fprintf(f
, "%s\tCGroup own mask: %s\n", prefix
, strnull(s
));
1167 m
= unit_get_members_mask(u
);
1169 _cleanup_free_
char *s
= NULL
;
1170 (void) cg_mask_to_string(m
, &s
);
1171 fprintf(f
, "%s\tCGroup members mask: %s\n", prefix
, strnull(s
));
1174 SET_FOREACH(t
, u
->names
, i
)
1175 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
1177 if (!sd_id128_is_null(u
->invocation_id
))
1178 fprintf(f
, "%s\tInvocation ID: " SD_ID128_FORMAT_STR
"\n",
1179 prefix
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
1181 STRV_FOREACH(j
, u
->documentation
)
1182 fprintf(f
, "%s\tDocumentation: %s\n", prefix
, *j
);
1184 following
= unit_following(u
);
1186 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->id
);
1188 r
= unit_following_set(u
, &following_set
);
1192 SET_FOREACH(other
, following_set
, i
)
1193 fprintf(f
, "%s\tFollowing Set Member: %s\n", prefix
, other
->id
);
1196 if (u
->fragment_path
)
1197 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->fragment_path
);
1200 fprintf(f
, "%s\tSource Path: %s\n", prefix
, u
->source_path
);
1202 STRV_FOREACH(j
, u
->dropin_paths
)
1203 fprintf(f
, "%s\tDropIn Path: %s\n", prefix
, *j
);
1205 if (u
->failure_action
!= EMERGENCY_ACTION_NONE
)
1206 fprintf(f
, "%s\tFailure Action: %s\n", prefix
, emergency_action_to_string(u
->failure_action
));
1207 if (u
->success_action
!= EMERGENCY_ACTION_NONE
)
1208 fprintf(f
, "%s\tSuccess Action: %s\n", prefix
, emergency_action_to_string(u
->success_action
));
1210 if (u
->job_timeout
!= USEC_INFINITY
)
1211 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->job_timeout
, 0));
1213 if (u
->job_timeout_action
!= EMERGENCY_ACTION_NONE
)
1214 fprintf(f
, "%s\tJob Timeout Action: %s\n", prefix
, emergency_action_to_string(u
->job_timeout_action
));
1216 if (u
->job_timeout_reboot_arg
)
1217 fprintf(f
, "%s\tJob Timeout Reboot Argument: %s\n", prefix
, u
->job_timeout_reboot_arg
);
1219 condition_dump_list(u
->conditions
, f
, prefix
, condition_type_to_string
);
1220 condition_dump_list(u
->asserts
, f
, prefix
, assert_type_to_string
);
1222 if (dual_timestamp_is_set(&u
->condition_timestamp
))
1224 "%s\tCondition Timestamp: %s\n"
1225 "%s\tCondition Result: %s\n",
1226 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->condition_timestamp
.realtime
)),
1227 prefix
, yes_no(u
->condition_result
));
1229 if (dual_timestamp_is_set(&u
->assert_timestamp
))
1231 "%s\tAssert Timestamp: %s\n"
1232 "%s\tAssert Result: %s\n",
1233 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->assert_timestamp
.realtime
)),
1234 prefix
, yes_no(u
->assert_result
));
1236 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
1237 UnitDependencyInfo di
;
1240 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
1243 fprintf(f
, "%s\t%s: %s (", prefix
, unit_dependency_to_string(d
), other
->id
);
1245 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1246 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1252 if (!hashmap_isempty(u
->requires_mounts_for
)) {
1253 UnitDependencyInfo di
;
1256 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1259 fprintf(f
, "%s\tRequiresMountsFor: %s (", prefix
, path
);
1261 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1262 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1268 if (u
->load_state
== UNIT_LOADED
) {
1271 "%s\tStopWhenUnneeded: %s\n"
1272 "%s\tRefuseManualStart: %s\n"
1273 "%s\tRefuseManualStop: %s\n"
1274 "%s\tDefaultDependencies: %s\n"
1275 "%s\tOnFailureJobMode: %s\n"
1276 "%s\tIgnoreOnIsolate: %s\n",
1277 prefix
, yes_no(u
->stop_when_unneeded
),
1278 prefix
, yes_no(u
->refuse_manual_start
),
1279 prefix
, yes_no(u
->refuse_manual_stop
),
1280 prefix
, yes_no(u
->default_dependencies
),
1281 prefix
, job_mode_to_string(u
->on_failure_job_mode
),
1282 prefix
, yes_no(u
->ignore_on_isolate
));
1284 if (UNIT_VTABLE(u
)->dump
)
1285 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
1287 } else if (u
->load_state
== UNIT_MERGED
)
1289 "%s\tMerged into: %s\n",
1290 prefix
, u
->merged_into
->id
);
1291 else if (u
->load_state
== UNIT_ERROR
)
1292 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror(-u
->load_error
));
1294 for (n
= sd_bus_track_first(u
->bus_track
); n
; n
= sd_bus_track_next(u
->bus_track
))
1295 fprintf(f
, "%s\tBus Ref: %s\n", prefix
, n
);
1298 job_dump(u
->job
, f
, prefix2
);
1301 job_dump(u
->nop_job
, f
, prefix2
);
1304 /* Common implementation for multiple backends */
1305 int unit_load_fragment_and_dropin(Unit
*u
) {
1310 /* Load a .{service,socket,...} file */
1311 r
= unit_load_fragment(u
);
1315 if (u
->load_state
== UNIT_STUB
)
1318 /* Load drop-in directory data. If u is an alias, we might be reloading the
1319 * target unit needlessly. But we cannot be sure which drops-ins have already
1320 * been loaded and which not, at least without doing complicated book-keeping,
1321 * so let's always reread all drop-ins. */
1322 return unit_load_dropin(unit_follow_merge(u
));
1325 /* Common implementation for multiple backends */
1326 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
1331 /* Same as unit_load_fragment_and_dropin(), but whether
1332 * something can be loaded or not doesn't matter. */
1334 /* Load a .service file */
1335 r
= unit_load_fragment(u
);
1339 if (u
->load_state
== UNIT_STUB
)
1340 u
->load_state
= UNIT_LOADED
;
1342 /* Load drop-in directory data */
1343 return unit_load_dropin(unit_follow_merge(u
));
1346 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1350 if (target
->type
!= UNIT_TARGET
)
1353 /* Only add the dependency if both units are loaded, so that
1354 * that loop check below is reliable */
1355 if (u
->load_state
!= UNIT_LOADED
||
1356 target
->load_state
!= UNIT_LOADED
)
1359 /* If either side wants no automatic dependencies, then let's
1361 if (!u
->default_dependencies
||
1362 !target
->default_dependencies
)
1365 /* Don't create loops */
1366 if (hashmap_get(target
->dependencies
[UNIT_BEFORE
], u
))
1369 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1372 static int unit_add_target_dependencies(Unit
*u
) {
1374 static const UnitDependency deps
[] = {
1386 for (k
= 0; k
< ELEMENTSOF(deps
); k
++) {
1391 HASHMAP_FOREACH_KEY(v
, target
, u
->dependencies
[deps
[k
]], i
) {
1392 r
= unit_add_default_target_dependency(u
, target
);
1401 static int unit_add_slice_dependencies(Unit
*u
) {
1402 UnitDependencyMask mask
;
1405 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1408 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1409 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1411 mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1413 if (UNIT_ISSET(u
->slice
))
1414 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, UNIT_DEREF(u
->slice
), true, mask
);
1416 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1419 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, NULL
, true, mask
);
1422 static int unit_add_mount_dependencies(Unit
*u
) {
1423 UnitDependencyInfo di
;
1430 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1431 char prefix
[strlen(path
) + 1];
1433 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1434 _cleanup_free_
char *p
= NULL
;
1437 r
= unit_name_from_path(prefix
, ".mount", &p
);
1441 m
= manager_get_unit(u
->manager
, p
);
1443 /* Make sure to load the mount unit if
1444 * it exists. If so the dependencies
1445 * on this unit will be added later
1446 * during the loading of the mount
1448 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1454 if (m
->load_state
!= UNIT_LOADED
)
1457 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1461 if (m
->fragment_path
) {
1462 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1472 static int unit_add_startup_units(Unit
*u
) {
1476 c
= unit_get_cgroup_context(u
);
1480 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1481 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1482 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1485 r
= set_ensure_allocated(&u
->manager
->startup_units
, NULL
);
1489 return set_put(u
->manager
->startup_units
, u
);
1492 int unit_load(Unit
*u
) {
1497 if (u
->in_load_queue
) {
1498 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1499 u
->in_load_queue
= false;
1502 if (u
->type
== _UNIT_TYPE_INVALID
)
1505 if (u
->load_state
!= UNIT_STUB
)
1508 if (u
->transient_file
) {
1509 r
= fflush_and_check(u
->transient_file
);
1513 u
->transient_file
= safe_fclose(u
->transient_file
);
1514 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1517 if (UNIT_VTABLE(u
)->load
) {
1518 r
= UNIT_VTABLE(u
)->load(u
);
1523 if (u
->load_state
== UNIT_STUB
) {
1528 if (u
->load_state
== UNIT_LOADED
) {
1530 r
= unit_add_target_dependencies(u
);
1534 r
= unit_add_slice_dependencies(u
);
1538 r
= unit_add_mount_dependencies(u
);
1542 r
= unit_add_startup_units(u
);
1546 if (u
->on_failure_job_mode
== JOB_ISOLATE
&& hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) > 1) {
1547 log_unit_error(u
, "More than one OnFailure= dependencies specified but OnFailureJobMode=isolate set. Refusing.");
1552 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1553 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1555 unit_update_cgroup_members_masks(u
);
1558 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1560 unit_add_to_dbus_queue(unit_follow_merge(u
));
1561 unit_add_to_gc_queue(u
);
1566 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
: UNIT_ERROR
;
1568 unit_add_to_dbus_queue(u
);
1569 unit_add_to_gc_queue(u
);
1571 log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1576 static bool unit_condition_test_list(Unit
*u
, Condition
*first
, const char *(*to_string
)(ConditionType t
)) {
1583 /* If the condition list is empty, then it is true */
1587 /* Otherwise, if all of the non-trigger conditions apply and
1588 * if any of the trigger conditions apply (unless there are
1589 * none) we return true */
1590 LIST_FOREACH(conditions
, c
, first
) {
1593 r
= condition_test(c
);
1596 "Couldn't determine result for %s=%s%s%s, assuming failed: %m",
1598 c
->trigger
? "|" : "",
1599 c
->negate
? "!" : "",
1605 c
->trigger
? "|" : "",
1606 c
->negate
? "!" : "",
1608 condition_result_to_string(c
->result
));
1610 if (!c
->trigger
&& r
<= 0)
1613 if (c
->trigger
&& triggered
<= 0)
1617 return triggered
!= 0;
1620 static bool unit_condition_test(Unit
*u
) {
1623 dual_timestamp_get(&u
->condition_timestamp
);
1624 u
->condition_result
= unit_condition_test_list(u
, u
->conditions
, condition_type_to_string
);
1626 return u
->condition_result
;
1629 static bool unit_assert_test(Unit
*u
) {
1632 dual_timestamp_get(&u
->assert_timestamp
);
1633 u
->assert_result
= unit_condition_test_list(u
, u
->asserts
, assert_type_to_string
);
1635 return u
->assert_result
;
1638 void unit_status_printf(Unit
*u
, const char *status
, const char *unit_status_msg_format
) {
1639 DISABLE_WARNING_FORMAT_NONLITERAL
;
1640 manager_status_printf(u
->manager
, STATUS_TYPE_NORMAL
, status
, unit_status_msg_format
, unit_description(u
));
1644 _pure_
static const char* unit_get_status_message_format(Unit
*u
, JobType t
) {
1646 const UnitStatusMessageFormats
*format_table
;
1649 assert(IN_SET(t
, JOB_START
, JOB_STOP
, JOB_RELOAD
));
1651 if (t
!= JOB_RELOAD
) {
1652 format_table
= &UNIT_VTABLE(u
)->status_message_formats
;
1654 format
= format_table
->starting_stopping
[t
== JOB_STOP
];
1660 /* Return generic strings */
1662 return "Starting %s.";
1663 else if (t
== JOB_STOP
)
1664 return "Stopping %s.";
1666 return "Reloading %s.";
1669 static void unit_status_print_starting_stopping(Unit
*u
, JobType t
) {
1674 /* Reload status messages have traditionally not been printed to console. */
1675 if (!IN_SET(t
, JOB_START
, JOB_STOP
))
1678 format
= unit_get_status_message_format(u
, t
);
1680 DISABLE_WARNING_FORMAT_NONLITERAL
;
1681 unit_status_printf(u
, "", format
);
1685 static void unit_status_log_starting_stopping_reloading(Unit
*u
, JobType t
) {
1686 const char *format
, *mid
;
1691 if (!IN_SET(t
, JOB_START
, JOB_STOP
, JOB_RELOAD
))
1694 if (log_on_console())
1697 /* We log status messages for all units and all operations. */
1699 format
= unit_get_status_message_format(u
, t
);
1701 DISABLE_WARNING_FORMAT_NONLITERAL
;
1702 (void) snprintf(buf
, sizeof buf
, format
, unit_description(u
));
1705 mid
= t
== JOB_START
? "MESSAGE_ID=" SD_MESSAGE_UNIT_STARTING_STR
:
1706 t
== JOB_STOP
? "MESSAGE_ID=" SD_MESSAGE_UNIT_STOPPING_STR
:
1707 "MESSAGE_ID=" SD_MESSAGE_UNIT_RELOADING_STR
;
1709 /* Note that we deliberately use LOG_MESSAGE() instead of
1710 * LOG_UNIT_MESSAGE() here, since this is supposed to mimic
1711 * closely what is written to screen using the status output,
1712 * which is supposed the highest level, friendliest output
1713 * possible, which means we should avoid the low-level unit
1715 log_struct(LOG_INFO
,
1716 LOG_MESSAGE("%s", buf
),
1718 LOG_UNIT_INVOCATION_ID(u
),
1723 void unit_status_emit_starting_stopping_reloading(Unit
*u
, JobType t
) {
1726 assert(t
< _JOB_TYPE_MAX
);
1728 unit_status_log_starting_stopping_reloading(u
, t
);
1729 unit_status_print_starting_stopping(u
, t
);
1732 int unit_start_limit_test(Unit
*u
) {
1735 if (ratelimit_test(&u
->start_limit
)) {
1736 u
->start_limit_hit
= false;
1740 log_unit_warning(u
, "Start request repeated too quickly.");
1741 u
->start_limit_hit
= true;
1743 return emergency_action(u
->manager
, u
->start_limit_action
, u
->reboot_arg
, "unit failed");
1746 bool unit_shall_confirm_spawn(Unit
*u
) {
1749 if (manager_is_confirm_spawn_disabled(u
->manager
))
1752 /* For some reasons units remaining in the same process group
1753 * as PID 1 fail to acquire the console even if it's not used
1754 * by any process. So skip the confirmation question for them. */
1755 return !unit_get_exec_context(u
)->same_pgrp
;
1758 static bool unit_verify_deps(Unit
*u
) {
1765 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined with
1766 * After=. We do not check Requires= or Requisite= here as they only should have an effect on the job
1767 * processing, but do not have any effect afterwards. We don't check BindsTo= dependencies that are not used in
1768 * conjunction with After= as for them any such check would make things entirely racy. */
1770 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], j
) {
1772 if (!hashmap_contains(u
->dependencies
[UNIT_AFTER
], other
))
1775 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1776 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1785 * -EBADR: This unit type does not support starting.
1786 * -EALREADY: Unit is already started.
1787 * -EAGAIN: An operation is already in progress. Retry later.
1788 * -ECANCELED: Too many requests for now.
1789 * -EPROTO: Assert failed
1790 * -EINVAL: Unit not loaded
1791 * -EOPNOTSUPP: Unit type not supported
1792 * -ENOLINK: The necessary dependencies are not fulfilled.
1794 int unit_start(Unit
*u
) {
1795 UnitActiveState state
;
1800 /* If this is already started, then this will succeed. Note
1801 * that this will even succeed if this unit is not startable
1802 * by the user. This is relied on to detect when we need to
1803 * wait for units and when waiting is finished. */
1804 state
= unit_active_state(u
);
1805 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1808 /* Units that aren't loaded cannot be started */
1809 if (u
->load_state
!= UNIT_LOADED
)
1812 /* If the conditions failed, don't do anything at all. If we
1813 * already are activating this call might still be useful to
1814 * speed up activation in case there is some hold-off time,
1815 * but we don't want to recheck the condition in that case. */
1816 if (state
!= UNIT_ACTIVATING
&&
1817 !unit_condition_test(u
)) {
1818 log_unit_debug(u
, "Starting requested but condition failed. Not starting unit.");
1822 /* If the asserts failed, fail the entire job */
1823 if (state
!= UNIT_ACTIVATING
&&
1824 !unit_assert_test(u
)) {
1825 log_unit_notice(u
, "Starting requested but asserts failed.");
1829 /* Units of types that aren't supported cannot be
1830 * started. Note that we do this test only after the condition
1831 * checks, so that we rather return condition check errors
1832 * (which are usually not considered a true failure) than "not
1833 * supported" errors (which are considered a failure).
1835 if (!unit_supported(u
))
1838 /* Let's make sure that the deps really are in order before we start this. Normally the job engine should have
1839 * taken care of this already, but let's check this here again. After all, our dependencies might not be in
1840 * effect anymore, due to a reload or due to a failed condition. */
1841 if (!unit_verify_deps(u
))
1844 /* Forward to the main object, if we aren't it. */
1845 following
= unit_following(u
);
1847 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1848 return unit_start(following
);
1851 /* If it is stopped, but we cannot start it, then fail */
1852 if (!UNIT_VTABLE(u
)->start
)
1855 /* We don't suppress calls to ->start() here when we are
1856 * already starting, to allow this request to be used as a
1857 * "hurry up" call, for example when the unit is in some "auto
1858 * restart" state where it waits for a holdoff timer to elapse
1859 * before it will start again. */
1861 unit_add_to_dbus_queue(u
);
1863 return UNIT_VTABLE(u
)->start(u
);
1866 bool unit_can_start(Unit
*u
) {
1869 if (u
->load_state
!= UNIT_LOADED
)
1872 if (!unit_supported(u
))
1875 return !!UNIT_VTABLE(u
)->start
;
1878 bool unit_can_isolate(Unit
*u
) {
1881 return unit_can_start(u
) &&
1886 * -EBADR: This unit type does not support stopping.
1887 * -EALREADY: Unit is already stopped.
1888 * -EAGAIN: An operation is already in progress. Retry later.
1890 int unit_stop(Unit
*u
) {
1891 UnitActiveState state
;
1896 state
= unit_active_state(u
);
1897 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1900 following
= unit_following(u
);
1902 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1903 return unit_stop(following
);
1906 if (!UNIT_VTABLE(u
)->stop
)
1909 unit_add_to_dbus_queue(u
);
1911 return UNIT_VTABLE(u
)->stop(u
);
1914 bool unit_can_stop(Unit
*u
) {
1917 if (!unit_supported(u
))
1923 return !!UNIT_VTABLE(u
)->stop
;
1927 * -EBADR: This unit type does not support reloading.
1928 * -ENOEXEC: Unit is not started.
1929 * -EAGAIN: An operation is already in progress. Retry later.
1931 int unit_reload(Unit
*u
) {
1932 UnitActiveState state
;
1937 if (u
->load_state
!= UNIT_LOADED
)
1940 if (!unit_can_reload(u
))
1943 state
= unit_active_state(u
);
1944 if (state
== UNIT_RELOADING
)
1947 if (state
!= UNIT_ACTIVE
) {
1948 log_unit_warning(u
, "Unit cannot be reloaded because it is inactive.");
1952 following
= unit_following(u
);
1954 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1955 return unit_reload(following
);
1958 unit_add_to_dbus_queue(u
);
1960 if (!UNIT_VTABLE(u
)->reload
) {
1961 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
1962 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), true);
1966 return UNIT_VTABLE(u
)->reload(u
);
1969 bool unit_can_reload(Unit
*u
) {
1972 if (UNIT_VTABLE(u
)->can_reload
)
1973 return UNIT_VTABLE(u
)->can_reload(u
);
1975 if (!hashmap_isempty(u
->dependencies
[UNIT_PROPAGATES_RELOAD_TO
]))
1978 return UNIT_VTABLE(u
)->reload
;
1981 static void unit_check_unneeded(Unit
*u
) {
1983 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1985 static const UnitDependency needed_dependencies
[] = {
1997 /* If this service shall be shut down when unneeded then do
2000 if (!u
->stop_when_unneeded
)
2003 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
2006 for (j
= 0; j
< ELEMENTSOF(needed_dependencies
); j
++) {
2011 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[needed_dependencies
[j
]], i
)
2012 if (unit_active_or_pending(other
) || unit_will_restart(other
))
2016 /* If stopping a unit fails continuously we might enter a stop
2017 * loop here, hence stop acting on the service being
2018 * unnecessary after a while. */
2019 if (!ratelimit_test(&u
->auto_stop_ratelimit
)) {
2020 log_unit_warning(u
, "Unit not needed anymore, but not stopping since we tried this too often recently.");
2024 log_unit_info(u
, "Unit not needed anymore. Stopping.");
2026 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
2027 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
2029 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2032 static void unit_check_binds_to(Unit
*u
) {
2033 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2045 if (unit_active_state(u
) != UNIT_ACTIVE
)
2048 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
) {
2052 if (!other
->coldplugged
)
2053 /* We might yet create a job for the other unit… */
2056 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2066 /* If stopping a unit fails continuously we might enter a stop
2067 * loop here, hence stop acting on the service being
2068 * unnecessary after a while. */
2069 if (!ratelimit_test(&u
->auto_stop_ratelimit
)) {
2070 log_unit_warning(u
, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other
->id
);
2075 log_unit_info(u
, "Unit is bound to inactive unit %s. Stopping, too.", other
->id
);
2077 /* A unit we need to run is gone. Sniff. Let's stop this. */
2078 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
2080 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2083 static void retroactively_start_dependencies(Unit
*u
) {
2089 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2091 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], i
)
2092 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2093 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2094 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
2096 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2097 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2098 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2099 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
2101 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
], i
)
2102 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2103 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2104 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
);
2106 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTS
], i
)
2107 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2108 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2110 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTED_BY
], i
)
2111 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2112 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2115 static void retroactively_stop_dependencies(Unit
*u
) {
2121 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2123 /* Pull down units which are bound to us recursively if enabled */
2124 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
2125 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2126 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2129 static void check_unneeded_dependencies(Unit
*u
) {
2135 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2137 /* Garbage collect services that might not be needed anymore, if enabled */
2138 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], i
)
2139 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2140 unit_check_unneeded(other
);
2141 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
], i
)
2142 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2143 unit_check_unneeded(other
);
2144 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUISITE
], i
)
2145 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2146 unit_check_unneeded(other
);
2147 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2148 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2149 unit_check_unneeded(other
);
2152 void unit_start_on_failure(Unit
*u
) {
2159 if (hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
2162 log_unit_info(u
, "Triggering OnFailure= dependencies.");
2164 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_ON_FAILURE
], i
) {
2167 r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_job_mode
, NULL
, NULL
);
2169 log_unit_error_errno(u
, r
, "Failed to enqueue OnFailure= job: %m");
2173 void unit_trigger_notify(Unit
*u
) {
2180 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_TRIGGERED_BY
], i
)
2181 if (UNIT_VTABLE(other
)->trigger_notify
)
2182 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2185 static int unit_log_resources(Unit
*u
) {
2187 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ 4];
2188 size_t n_message_parts
= 0, n_iovec
= 0;
2189 char* message_parts
[3 + 1], *t
;
2190 nsec_t nsec
= NSEC_INFINITY
;
2191 CGroupIPAccountingMetric m
;
2194 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2195 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2196 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2197 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2198 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2203 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2204 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2205 * information and the complete data in structured fields. */
2207 (void) unit_get_cpu_usage(u
, &nsec
);
2208 if (nsec
!= NSEC_INFINITY
) {
2209 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2211 /* Format the CPU time for inclusion in the structured log message */
2212 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2216 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2218 /* Format the CPU time for inclusion in the human language message string */
2219 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2220 t
= strjoin(n_message_parts
> 0 ? "consumed " : "Consumed ", buf
, " CPU time");
2226 message_parts
[n_message_parts
++] = t
;
2229 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2230 char buf
[FORMAT_BYTES_MAX
] = "";
2231 uint64_t value
= UINT64_MAX
;
2233 assert(ip_fields
[m
]);
2235 (void) unit_get_ip_accounting(u
, m
, &value
);
2236 if (value
== UINT64_MAX
)
2239 /* Format IP accounting data for inclusion in the structured log message */
2240 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2244 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2246 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2247 * bytes counters (and not for the packets counters) */
2248 if (m
== CGROUP_IP_INGRESS_BYTES
)
2249 t
= strjoin(n_message_parts
> 0 ? "received " : "Received ",
2250 format_bytes(buf
, sizeof(buf
), value
),
2252 else if (m
== CGROUP_IP_EGRESS_BYTES
)
2253 t
= strjoin(n_message_parts
> 0 ? "sent " : "Sent ",
2254 format_bytes(buf
, sizeof(buf
), value
),
2263 message_parts
[n_message_parts
++] = t
;
2266 /* Is there any accounting data available at all? */
2272 if (n_message_parts
== 0)
2273 t
= strjoina("MESSAGE=", u
->id
, ": Completed");
2275 _cleanup_free_
char *joined
;
2277 message_parts
[n_message_parts
] = NULL
;
2279 joined
= strv_join(message_parts
, ", ");
2285 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
);
2288 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2289 * and hence don't increase n_iovec for them */
2290 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2291 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2293 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2294 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2296 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2297 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2299 log_struct_iovec(LOG_INFO
, iovec
, n_iovec
+ 4);
2303 for (i
= 0; i
< n_message_parts
; i
++)
2304 free(message_parts
[i
]);
2306 for (i
= 0; i
< n_iovec
; i
++)
2307 free(iovec
[i
].iov_base
);
2313 static void unit_update_on_console(Unit
*u
) {
2318 b
= unit_needs_console(u
);
2319 if (u
->on_console
== b
)
2324 manager_ref_console(u
->manager
);
2326 manager_unref_console(u
->manager
);
2330 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
2335 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2336 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2338 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2339 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2340 * remounted 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 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2465 if (u
->type
== UNIT_SERVICE
&&
2466 !UNIT_IS_ACTIVE_OR_RELOADING(os
) &&
2467 !MANAGER_IS_RELOADING(m
)) {
2468 /* Write audit record if we have just finished starting up */
2469 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_START
, true);
2473 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
))
2474 manager_send_unit_plymouth(m
, u
);
2478 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) &&
2479 !UNIT_IS_INACTIVE_OR_FAILED(os
)
2480 && !MANAGER_IS_RELOADING(m
)) {
2482 /* This unit just stopped/failed. */
2483 if (u
->type
== UNIT_SERVICE
) {
2485 /* Hmm, if there was no start record written
2486 * write it now, so that we always have a nice
2489 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_START
, ns
== UNIT_INACTIVE
);
2491 if (ns
== UNIT_INACTIVE
)
2492 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_STOP
, true);
2494 /* Write audit record if we have just finished shutting down */
2495 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_STOP
, ns
== UNIT_INACTIVE
);
2497 u
->in_audit
= false;
2500 /* Write a log message about consumed resources */
2501 unit_log_resources(u
);
2505 manager_recheck_journal(m
);
2506 manager_recheck_dbus(m
);
2507 unit_trigger_notify(u
);
2509 if (!MANAGER_IS_RELOADING(u
->manager
)) {
2510 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2511 unit_check_unneeded(u
);
2513 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens when
2514 * something BindsTo= to a Type=oneshot unit, as these units go directly from starting to inactive,
2515 * without ever entering started.) */
2516 unit_check_binds_to(u
);
2518 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
)
2519 (void) emergency_action(u
->manager
, u
->failure_action
, u
->reboot_arg
, "unit failed");
2520 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
)
2521 (void) emergency_action(u
->manager
, u
->success_action
, u
->reboot_arg
, "unit succeeded");
2524 unit_add_to_dbus_queue(u
);
2525 unit_add_to_gc_queue(u
);
2528 int unit_watch_pid(Unit
*u
, pid_t pid
) {
2532 assert(pid_is_valid(pid
));
2534 /* Watch a specific PID */
2536 r
= set_ensure_allocated(&u
->pids
, NULL
);
2540 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2544 /* First try, let's add the unit keyed by "pid". */
2545 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2551 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2552 * to an array of Units rather than just a Unit), lists us already. */
2554 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2556 for (; array
[n
]; n
++)
2560 if (found
) /* Found it already? if so, do nothing */
2565 /* Allocate a new array */
2566 new_array
= new(Unit
*, n
+ 2);
2570 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2572 new_array
[n
+1] = NULL
;
2574 /* Add or replace the old array */
2575 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2586 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2593 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2597 assert(pid_is_valid(pid
));
2599 /* First let's drop the unit in case it's keyed as "pid". */
2600 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2602 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2603 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2607 /* Let's iterate through the array, dropping our own entry */
2608 for (n
= 0; array
[n
]; n
++)
2610 array
[m
++] = array
[n
];
2614 /* The array is now empty, remove the entire entry */
2615 assert(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2620 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2623 void unit_unwatch_all_pids(Unit
*u
) {
2626 while (!set_isempty(u
->pids
))
2627 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2629 u
->pids
= set_free(u
->pids
);
2632 void unit_tidy_watch_pids(Unit
*u
, pid_t except1
, pid_t except2
) {
2638 /* Cleans dead PIDs from our list */
2640 SET_FOREACH(e
, u
->pids
, i
) {
2641 pid_t pid
= PTR_TO_PID(e
);
2643 if (pid
== except1
|| pid
== except2
)
2646 if (!pid_is_unwaited(pid
))
2647 unit_unwatch_pid(u
, pid
);
2651 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2653 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2657 case JOB_VERIFY_ACTIVE
:
2660 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2661 * startable by us but may appear due to external events, and it thus makes sense to permit enqueing
2666 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2667 * external events), hence it makes no sense to permit enqueing such a request either. */
2668 return !u
->perpetual
;
2671 case JOB_TRY_RESTART
:
2672 return unit_can_stop(u
) && unit_can_start(u
);
2675 case JOB_TRY_RELOAD
:
2676 return unit_can_reload(u
);
2678 case JOB_RELOAD_OR_START
:
2679 return unit_can_reload(u
) && unit_can_start(u
);
2682 assert_not_reached("Invalid job type");
2686 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
) {
2689 /* Only warn about some unit types */
2690 if (!IN_SET(dependency
, UNIT_CONFLICTS
, UNIT_CONFLICTED_BY
, UNIT_BEFORE
, UNIT_AFTER
, UNIT_ON_FAILURE
, UNIT_TRIGGERS
, UNIT_TRIGGERED_BY
))
2693 if (streq_ptr(u
->id
, other
))
2694 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
2696 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other
), u
->id
);
2699 static int unit_add_dependency_hashmap(
2702 UnitDependencyMask origin_mask
,
2703 UnitDependencyMask destination_mask
) {
2705 UnitDependencyInfo info
;
2710 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2711 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2712 assert(origin_mask
> 0 || destination_mask
> 0);
2714 r
= hashmap_ensure_allocated(h
, NULL
);
2718 assert_cc(sizeof(void*) == sizeof(info
));
2720 info
.data
= hashmap_get(*h
, other
);
2722 /* Entry already exists. Add in our mask. */
2724 if ((info
.origin_mask
& origin_mask
) == info
.origin_mask
&&
2725 (info
.destination_mask
& destination_mask
) == info
.destination_mask
)
2728 info
.origin_mask
|= origin_mask
;
2729 info
.destination_mask
|= destination_mask
;
2731 r
= hashmap_update(*h
, other
, info
.data
);
2733 info
= (UnitDependencyInfo
) {
2734 .origin_mask
= origin_mask
,
2735 .destination_mask
= destination_mask
,
2738 r
= hashmap_put(*h
, other
, info
.data
);
2746 int unit_add_dependency(
2751 UnitDependencyMask mask
) {
2753 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2754 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2755 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2756 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2757 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2758 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2759 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
2760 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
2761 [UNIT_WANTED_BY
] = UNIT_WANTS
,
2762 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
2763 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
2764 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
2765 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
2766 [UNIT_BEFORE
] = UNIT_AFTER
,
2767 [UNIT_AFTER
] = UNIT_BEFORE
,
2768 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
2769 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
2770 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
2771 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
2772 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
2773 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
2774 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
2775 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
,
2777 Unit
*original_u
= u
, *original_other
= other
;
2781 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
2784 u
= unit_follow_merge(u
);
2785 other
= unit_follow_merge(other
);
2787 /* We won't allow dependencies on ourselves. We will not
2788 * consider them an error however. */
2790 maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
2794 if ((d
== UNIT_BEFORE
&& other
->type
== UNIT_DEVICE
) ||
2795 (d
== UNIT_AFTER
&& u
->type
== UNIT_DEVICE
)) {
2796 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
2800 r
= unit_add_dependency_hashmap(u
->dependencies
+ d
, other
, mask
, 0);
2804 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
2805 r
= unit_add_dependency_hashmap(other
->dependencies
+ inverse_table
[d
], u
, 0, mask
);
2810 if (add_reference
) {
2811 r
= unit_add_dependency_hashmap(u
->dependencies
+ UNIT_REFERENCES
, other
, mask
, 0);
2815 r
= unit_add_dependency_hashmap(other
->dependencies
+ UNIT_REFERENCED_BY
, u
, 0, mask
);
2820 unit_add_to_dbus_queue(u
);
2824 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
2829 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2833 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
2836 static int resolve_template(Unit
*u
, const char *name
, const char*path
, char **buf
, const char **ret
) {
2840 assert(name
|| path
);
2845 name
= basename(path
);
2847 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
2854 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
2856 _cleanup_free_
char *i
= NULL
;
2858 r
= unit_name_to_prefix(u
->id
, &i
);
2862 r
= unit_name_replace_instance(name
, i
, buf
);
2871 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
, UnitDependencyMask mask
) {
2872 _cleanup_free_
char *buf
= NULL
;
2877 assert(name
|| path
);
2879 r
= resolve_template(u
, name
, path
, &buf
, &name
);
2883 r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
);
2887 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2890 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
, UnitDependencyMask mask
) {
2891 _cleanup_free_
char *buf
= NULL
;
2896 assert(name
|| path
);
2898 r
= resolve_template(u
, name
, path
, &buf
, &name
);
2902 r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
);
2906 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
2909 int set_unit_path(const char *p
) {
2910 /* This is mostly for debug purposes */
2911 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
2917 char *unit_dbus_path(Unit
*u
) {
2923 return unit_dbus_path_from_name(u
->id
);
2926 char *unit_dbus_path_invocation_id(Unit
*u
) {
2929 if (sd_id128_is_null(u
->invocation_id
))
2932 return unit_dbus_path_from_name(u
->invocation_id_string
);
2935 int unit_set_slice(Unit
*u
, Unit
*slice
) {
2939 /* Sets the unit slice if it has not been set before. Is extra
2940 * careful, to only allow this for units that actually have a
2941 * cgroup context. Also, we don't allow to set this for slices
2942 * (since the parent slice is derived from the name). Make
2943 * sure the unit we set is actually a slice. */
2945 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2948 if (u
->type
== UNIT_SLICE
)
2951 if (unit_active_state(u
) != UNIT_INACTIVE
)
2954 if (slice
->type
!= UNIT_SLICE
)
2957 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
2958 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
2961 if (UNIT_DEREF(u
->slice
) == slice
)
2964 /* Disallow slice changes if @u is already bound to cgroups */
2965 if (UNIT_ISSET(u
->slice
) && u
->cgroup_realized
)
2968 unit_ref_set(&u
->slice
, u
, slice
);
2972 int unit_set_default_slice(Unit
*u
) {
2973 _cleanup_free_
char *b
= NULL
;
2974 const char *slice_name
;
2980 if (UNIT_ISSET(u
->slice
))
2984 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
2986 /* Implicitly place all instantiated units in their
2987 * own per-template slice */
2989 r
= unit_name_to_prefix(u
->id
, &prefix
);
2993 /* The prefix is already escaped, but it might include
2994 * "-" which has a special meaning for slice units,
2995 * hence escape it here extra. */
2996 escaped
= unit_name_escape(prefix
);
3000 if (MANAGER_IS_SYSTEM(u
->manager
))
3001 b
= strjoin("system-", escaped
, ".slice");
3003 b
= strappend(escaped
, ".slice");
3010 MANAGER_IS_SYSTEM(u
->manager
) && !unit_has_name(u
, SPECIAL_INIT_SCOPE
)
3011 ? SPECIAL_SYSTEM_SLICE
3012 : SPECIAL_ROOT_SLICE
;
3014 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3018 return unit_set_slice(u
, slice
);
3021 const char *unit_slice_name(Unit
*u
) {
3024 if (!UNIT_ISSET(u
->slice
))
3027 return UNIT_DEREF(u
->slice
)->id
;
3030 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3031 _cleanup_free_
char *t
= NULL
;
3038 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3041 if (unit_has_name(u
, t
))
3044 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3045 assert(r
< 0 || *_found
!= u
);
3049 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3050 const char *name
, *old_owner
, *new_owner
;
3057 r
= sd_bus_message_read(message
, "sss", &name
, &old_owner
, &new_owner
);
3059 bus_log_parse_error(r
);
3063 old_owner
= empty_to_null(old_owner
);
3064 new_owner
= empty_to_null(new_owner
);
3066 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3067 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
3072 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3079 if (u
->match_bus_slot
)
3082 match
= strjoina("type='signal',"
3083 "sender='org.freedesktop.DBus',"
3084 "path='/org/freedesktop/DBus',"
3085 "interface='org.freedesktop.DBus',"
3086 "member='NameOwnerChanged',"
3087 "arg0='", name
, "'");
3089 return sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3092 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3098 /* Watch a specific name on the bus. We only support one unit
3099 * watching each name for now. */
3101 if (u
->manager
->api_bus
) {
3102 /* If the bus is already available, install the match directly.
3103 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3104 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3106 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3109 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3111 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3112 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3118 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3122 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3123 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3126 bool unit_can_serialize(Unit
*u
) {
3129 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
3132 static int unit_serialize_cgroup_mask(FILE *f
, const char *key
, CGroupMask mask
) {
3133 _cleanup_free_
char *s
= NULL
;
3140 r
= cg_mask_to_string(mask
, &s
);
3151 static const char *ip_accounting_metric_field
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
3152 [CGROUP_IP_INGRESS_BYTES
] = "ip-accounting-ingress-bytes",
3153 [CGROUP_IP_INGRESS_PACKETS
] = "ip-accounting-ingress-packets",
3154 [CGROUP_IP_EGRESS_BYTES
] = "ip-accounting-egress-bytes",
3155 [CGROUP_IP_EGRESS_PACKETS
] = "ip-accounting-egress-packets",
3158 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
, bool serialize_jobs
) {
3159 CGroupIPAccountingMetric m
;
3166 if (unit_can_serialize(u
)) {
3167 r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
);
3172 dual_timestamp_serialize(f
, "state-change-timestamp", &u
->state_change_timestamp
);
3174 dual_timestamp_serialize(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
3175 dual_timestamp_serialize(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
3176 dual_timestamp_serialize(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
3177 dual_timestamp_serialize(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
3179 dual_timestamp_serialize(f
, "condition-timestamp", &u
->condition_timestamp
);
3180 dual_timestamp_serialize(f
, "assert-timestamp", &u
->assert_timestamp
);
3182 if (dual_timestamp_is_set(&u
->condition_timestamp
))
3183 unit_serialize_item(u
, f
, "condition-result", yes_no(u
->condition_result
));
3185 if (dual_timestamp_is_set(&u
->assert_timestamp
))
3186 unit_serialize_item(u
, f
, "assert-result", yes_no(u
->assert_result
));
3188 unit_serialize_item(u
, f
, "transient", yes_no(u
->transient
));
3190 unit_serialize_item(u
, f
, "exported-invocation-id", yes_no(u
->exported_invocation_id
));
3191 unit_serialize_item(u
, f
, "exported-log-level-max", yes_no(u
->exported_log_level_max
));
3192 unit_serialize_item(u
, f
, "exported-log-extra-fields", yes_no(u
->exported_log_extra_fields
));
3194 unit_serialize_item_format(u
, f
, "cpu-usage-base", "%" PRIu64
, u
->cpu_usage_base
);
3195 if (u
->cpu_usage_last
!= NSEC_INFINITY
)
3196 unit_serialize_item_format(u
, f
, "cpu-usage-last", "%" PRIu64
, u
->cpu_usage_last
);
3199 unit_serialize_item(u
, f
, "cgroup", u
->cgroup_path
);
3200 unit_serialize_item(u
, f
, "cgroup-realized", yes_no(u
->cgroup_realized
));
3201 (void) unit_serialize_cgroup_mask(f
, "cgroup-realized-mask", u
->cgroup_realized_mask
);
3202 (void) unit_serialize_cgroup_mask(f
, "cgroup-enabled-mask", u
->cgroup_enabled_mask
);
3203 unit_serialize_item_format(u
, f
, "cgroup-bpf-realized", "%i", u
->cgroup_bpf_state
);
3205 if (uid_is_valid(u
->ref_uid
))
3206 unit_serialize_item_format(u
, f
, "ref-uid", UID_FMT
, u
->ref_uid
);
3207 if (gid_is_valid(u
->ref_gid
))
3208 unit_serialize_item_format(u
, f
, "ref-gid", GID_FMT
, u
->ref_gid
);
3210 if (!sd_id128_is_null(u
->invocation_id
))
3211 unit_serialize_item_format(u
, f
, "invocation-id", SD_ID128_FORMAT_STR
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
3213 bus_track_serialize(u
->bus_track
, f
, "ref");
3215 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
3218 r
= unit_get_ip_accounting(u
, m
, &v
);
3220 unit_serialize_item_format(u
, f
, ip_accounting_metric_field
[m
], "%" PRIu64
, v
);
3223 if (serialize_jobs
) {
3225 fprintf(f
, "job\n");
3226 job_serialize(u
->job
, f
);
3230 fprintf(f
, "job\n");
3231 job_serialize(u
->nop_job
, f
);
3240 int unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
3256 int unit_serialize_item_escaped(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
3257 _cleanup_free_
char *c
= NULL
;
3278 int unit_serialize_item_fd(Unit
*u
, FILE *f
, FDSet
*fds
, const char *key
, int fd
) {
3288 copy
= fdset_put_dup(fds
, fd
);
3292 fprintf(f
, "%s=%i\n", key
, copy
);
3296 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *format
, ...) {
3307 va_start(ap
, format
);
3308 vfprintf(f
, format
, ap
);
3314 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
3322 char line
[LINE_MAX
], *l
, *v
;
3323 CGroupIPAccountingMetric m
;
3326 if (!fgets(line
, sizeof(line
), f
)) {
3339 k
= strcspn(l
, "=");
3347 if (streq(l
, "job")) {
3349 /* new-style serialized job */
3356 r
= job_deserialize(j
, f
);
3362 r
= hashmap_put(u
->manager
->jobs
, UINT32_TO_PTR(j
->id
), j
);
3368 r
= job_install_deserialized(j
);
3370 hashmap_remove(u
->manager
->jobs
, UINT32_TO_PTR(j
->id
));
3374 } else /* legacy for pre-44 */
3375 log_unit_warning(u
, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v
);
3377 } else if (streq(l
, "state-change-timestamp")) {
3378 dual_timestamp_deserialize(v
, &u
->state_change_timestamp
);
3380 } else if (streq(l
, "inactive-exit-timestamp")) {
3381 dual_timestamp_deserialize(v
, &u
->inactive_exit_timestamp
);
3383 } else if (streq(l
, "active-enter-timestamp")) {
3384 dual_timestamp_deserialize(v
, &u
->active_enter_timestamp
);
3386 } else if (streq(l
, "active-exit-timestamp")) {
3387 dual_timestamp_deserialize(v
, &u
->active_exit_timestamp
);
3389 } else if (streq(l
, "inactive-enter-timestamp")) {
3390 dual_timestamp_deserialize(v
, &u
->inactive_enter_timestamp
);
3392 } else if (streq(l
, "condition-timestamp")) {
3393 dual_timestamp_deserialize(v
, &u
->condition_timestamp
);
3395 } else if (streq(l
, "assert-timestamp")) {
3396 dual_timestamp_deserialize(v
, &u
->assert_timestamp
);
3398 } else if (streq(l
, "condition-result")) {
3400 r
= parse_boolean(v
);
3402 log_unit_debug(u
, "Failed to parse condition result value %s, ignoring.", v
);
3404 u
->condition_result
= r
;
3408 } else if (streq(l
, "assert-result")) {
3410 r
= parse_boolean(v
);
3412 log_unit_debug(u
, "Failed to parse assert result value %s, ignoring.", v
);
3414 u
->assert_result
= r
;
3418 } else if (streq(l
, "transient")) {
3420 r
= parse_boolean(v
);
3422 log_unit_debug(u
, "Failed to parse transient bool %s, ignoring.", v
);
3428 } else if (streq(l
, "exported-invocation-id")) {
3430 r
= parse_boolean(v
);
3432 log_unit_debug(u
, "Failed to parse exported invocation ID bool %s, ignoring.", v
);
3434 u
->exported_invocation_id
= r
;
3438 } else if (streq(l
, "exported-log-level-max")) {
3440 r
= parse_boolean(v
);
3442 log_unit_debug(u
, "Failed to parse exported log level max bool %s, ignoring.", v
);
3444 u
->exported_log_level_max
= r
;
3448 } else if (streq(l
, "exported-log-extra-fields")) {
3450 r
= parse_boolean(v
);
3452 log_unit_debug(u
, "Failed to parse exported log extra fields bool %s, ignoring.", v
);
3454 u
->exported_log_extra_fields
= r
;
3458 } else if (STR_IN_SET(l
, "cpu-usage-base", "cpuacct-usage-base")) {
3460 r
= safe_atou64(v
, &u
->cpu_usage_base
);
3462 log_unit_debug(u
, "Failed to parse CPU usage base %s, ignoring.", v
);
3466 } else if (streq(l
, "cpu-usage-last")) {
3468 r
= safe_atou64(v
, &u
->cpu_usage_last
);
3470 log_unit_debug(u
, "Failed to read CPU usage last %s, ignoring.", v
);
3474 } else if (streq(l
, "cgroup")) {
3476 r
= unit_set_cgroup_path(u
, v
);
3478 log_unit_debug_errno(u
, r
, "Failed to set cgroup path %s, ignoring: %m", v
);
3480 (void) unit_watch_cgroup(u
);
3483 } else if (streq(l
, "cgroup-realized")) {
3486 b
= parse_boolean(v
);
3488 log_unit_debug(u
, "Failed to parse cgroup-realized bool %s, ignoring.", v
);
3490 u
->cgroup_realized
= b
;
3494 } else if (streq(l
, "cgroup-realized-mask")) {
3496 r
= cg_mask_from_string(v
, &u
->cgroup_realized_mask
);
3498 log_unit_debug(u
, "Failed to parse cgroup-realized-mask %s, ignoring.", v
);
3501 } else if (streq(l
, "cgroup-enabled-mask")) {
3503 r
= cg_mask_from_string(v
, &u
->cgroup_enabled_mask
);
3505 log_unit_debug(u
, "Failed to parse cgroup-enabled-mask %s, ignoring.", v
);
3508 } else if (streq(l
, "cgroup-bpf-realized")) {
3511 r
= safe_atoi(v
, &i
);
3513 log_unit_debug(u
, "Failed to parse cgroup BPF state %s, ignoring.", v
);
3515 u
->cgroup_bpf_state
=
3516 i
< 0 ? UNIT_CGROUP_BPF_INVALIDATED
:
3517 i
> 0 ? UNIT_CGROUP_BPF_ON
:
3518 UNIT_CGROUP_BPF_OFF
;
3522 } else if (streq(l
, "ref-uid")) {
3525 r
= parse_uid(v
, &uid
);
3527 log_unit_debug(u
, "Failed to parse referenced UID %s, ignoring.", v
);
3529 unit_ref_uid_gid(u
, uid
, GID_INVALID
);
3533 } else if (streq(l
, "ref-gid")) {
3536 r
= parse_gid(v
, &gid
);
3538 log_unit_debug(u
, "Failed to parse referenced GID %s, ignoring.", v
);
3540 unit_ref_uid_gid(u
, UID_INVALID
, gid
);
3542 } else if (streq(l
, "ref")) {
3544 r
= strv_extend(&u
->deserialized_refs
, v
);
3549 } else if (streq(l
, "invocation-id")) {
3552 r
= sd_id128_from_string(v
, &id
);
3554 log_unit_debug(u
, "Failed to parse invocation id %s, ignoring.", v
);
3556 r
= unit_set_invocation_id(u
, id
);
3558 log_unit_warning_errno(u
, r
, "Failed to set invocation ID for unit: %m");
3564 /* Check if this is an IP accounting metric serialization field */
3565 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++)
3566 if (streq(l
, ip_accounting_metric_field
[m
]))
3568 if (m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
) {
3571 r
= safe_atou64(v
, &c
);
3573 log_unit_debug(u
, "Failed to parse IP accounting value %s, ignoring.", v
);
3575 u
->ip_accounting_extra
[m
] = c
;
3579 if (unit_can_serialize(u
)) {
3580 r
= exec_runtime_deserialize_compat(u
, l
, v
, fds
);
3582 log_unit_warning(u
, "Failed to deserialize runtime parameter '%s', ignoring.", l
);
3586 /* Returns positive if key was handled by the call */
3590 r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
);
3592 log_unit_warning(u
, "Failed to deserialize unit parameter '%s', ignoring.", l
);
3596 /* Versions before 228 did not carry a state change timestamp. In this case, take the current time. This is
3597 * useful, so that timeouts based on this timestamp don't trigger too early, and is in-line with the logic from
3598 * before 228 where the base for timeouts was not persistent across reboots. */
3600 if (!dual_timestamp_is_set(&u
->state_change_timestamp
))
3601 dual_timestamp_get(&u
->state_change_timestamp
);
3603 /* Let's make sure that everything that is deserialized also gets any potential new cgroup settings applied
3604 * after we are done. For that we invalidate anything already realized, so that we can realize it again. */
3605 unit_invalidate_cgroup(u
, _CGROUP_MASK_ALL
);
3606 unit_invalidate_cgroup_bpf(u
);
3611 void unit_deserialize_skip(FILE *f
) {
3614 /* Skip serialized data for this unit. We don't know what it is. */
3617 char line
[LINE_MAX
], *l
;
3619 if (!fgets(line
, sizeof line
, f
))
3632 int unit_add_node_dependency(Unit
*u
, const char *what
, bool wants
, UnitDependency dep
, UnitDependencyMask mask
) {
3634 _cleanup_free_
char *e
= NULL
;
3639 /* Adds in links to the device node that this unit is based on */
3643 if (!is_device_path(what
))
3646 /* When device units aren't supported (such as in a
3647 * container), don't create dependencies on them. */
3648 if (!unit_type_supported(UNIT_DEVICE
))
3651 r
= unit_name_from_path(what
, ".device", &e
);
3655 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3659 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3660 dep
= UNIT_BINDS_TO
;
3662 r
= unit_add_two_dependencies(u
, UNIT_AFTER
,
3663 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3664 device
, true, mask
);
3669 r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false, mask
);
3677 int unit_coldplug(Unit
*u
) {
3683 /* Make sure we don't enter a loop, when coldplugging
3688 u
->coldplugged
= true;
3690 STRV_FOREACH(i
, u
->deserialized_refs
) {
3691 q
= bus_unit_track_add_name(u
, *i
);
3692 if (q
< 0 && r
>= 0)
3695 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3697 if (UNIT_VTABLE(u
)->coldplug
) {
3698 q
= UNIT_VTABLE(u
)->coldplug(u
);
3699 if (q
< 0 && r
>= 0)
3704 q
= job_coldplug(u
->job
);
3705 if (q
< 0 && r
>= 0)
3712 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3718 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3719 * are never out-of-date. */
3720 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3723 if (stat(path
, &st
) < 0)
3724 /* What, cannot access this anymore? */
3728 /* For masked files check if they are still so */
3729 return !null_or_empty(&st
);
3731 /* For non-empty files check the mtime */
3732 return timespec_load(&st
.st_mtim
) > mtime
;
3737 bool unit_need_daemon_reload(Unit
*u
) {
3738 _cleanup_strv_free_
char **t
= NULL
;
3743 /* For unit files, we allow masking… */
3744 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3745 u
->load_state
== UNIT_MASKED
))
3748 /* Source paths should not be masked… */
3749 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3752 if (u
->load_state
== UNIT_LOADED
)
3753 (void) unit_find_dropin_paths(u
, &t
);
3754 if (!strv_equal(u
->dropin_paths
, t
))
3757 /* … any drop-ins that are masked are simply omitted from the list. */
3758 STRV_FOREACH(path
, u
->dropin_paths
)
3759 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3765 void unit_reset_failed(Unit
*u
) {
3768 if (UNIT_VTABLE(u
)->reset_failed
)
3769 UNIT_VTABLE(u
)->reset_failed(u
);
3771 RATELIMIT_RESET(u
->start_limit
);
3772 u
->start_limit_hit
= false;
3775 Unit
*unit_following(Unit
*u
) {
3778 if (UNIT_VTABLE(u
)->following
)
3779 return UNIT_VTABLE(u
)->following(u
);
3784 bool unit_stop_pending(Unit
*u
) {
3787 /* This call does check the current state of the unit. It's
3788 * hence useful to be called from state change calls of the
3789 * unit itself, where the state isn't updated yet. This is
3790 * different from unit_inactive_or_pending() which checks both
3791 * the current state and for a queued job. */
3793 return u
->job
&& u
->job
->type
== JOB_STOP
;
3796 bool unit_inactive_or_pending(Unit
*u
) {
3799 /* Returns true if the unit is inactive or going down */
3801 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3804 if (unit_stop_pending(u
))
3810 bool unit_active_or_pending(Unit
*u
) {
3813 /* Returns true if the unit is active or going up */
3815 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3819 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3825 bool unit_will_restart(Unit
*u
) {
3828 if (!UNIT_VTABLE(u
)->will_restart
)
3831 return UNIT_VTABLE(u
)->will_restart(u
);
3834 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3836 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3837 assert(SIGNAL_VALID(signo
));
3839 if (!UNIT_VTABLE(u
)->kill
)
3842 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3845 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3849 pid_set
= set_new(NULL
);
3853 /* Exclude the main/control pids from being killed via the cgroup */
3855 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3860 if (control_pid
> 0) {
3861 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3873 int unit_kill_common(
3879 sd_bus_error
*error
) {
3882 bool killed
= false;
3884 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3886 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3887 else if (main_pid
== 0)
3888 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3891 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3892 if (control_pid
< 0)
3893 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3894 else if (control_pid
== 0)
3895 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3898 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3899 if (control_pid
> 0) {
3900 if (kill(control_pid
, signo
) < 0)
3906 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3908 if (kill(main_pid
, signo
) < 0)
3914 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3915 _cleanup_set_free_ Set
*pid_set
= NULL
;
3918 /* Exclude the main/control pids from being killed via the cgroup */
3919 pid_set
= unit_pid_set(main_pid
, control_pid
);
3923 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, NULL
, NULL
);
3924 if (q
< 0 && !IN_SET(q
, -EAGAIN
, -ESRCH
, -ENOENT
))
3930 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
))
3936 int unit_following_set(Unit
*u
, Set
**s
) {
3940 if (UNIT_VTABLE(u
)->following_set
)
3941 return UNIT_VTABLE(u
)->following_set(u
, s
);
3947 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3952 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3953 r
= unit_file_get_state(
3954 u
->manager
->unit_file_scope
,
3957 &u
->unit_file_state
);
3959 u
->unit_file_state
= UNIT_FILE_BAD
;
3962 return u
->unit_file_state
;
3965 int unit_get_unit_file_preset(Unit
*u
) {
3968 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3969 u
->unit_file_preset
= unit_file_query_preset(
3970 u
->manager
->unit_file_scope
,
3972 basename(u
->fragment_path
));
3974 return u
->unit_file_preset
;
3977 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
3983 unit_ref_unset(ref
);
3985 ref
->source
= source
;
3986 ref
->target
= target
;
3987 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
3991 void unit_ref_unset(UnitRef
*ref
) {
3997 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
3998 * be unreferenced now. */
3999 unit_add_to_gc_queue(ref
->target
);
4001 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4002 ref
->source
= ref
->target
= NULL
;
4005 static int user_from_unit_name(Unit
*u
, char **ret
) {
4007 static const uint8_t hash_key
[] = {
4008 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4009 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4012 _cleanup_free_
char *n
= NULL
;
4015 r
= unit_name_to_prefix(u
->id
, &n
);
4019 if (valid_user_group_name(n
)) {
4025 /* If we can't use the unit name as a user name, then let's hash it and use that */
4026 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4032 int unit_patch_contexts(Unit
*u
) {
4040 /* Patch in the manager defaults into the exec and cgroup
4041 * contexts, _after_ the rest of the settings have been
4044 ec
= unit_get_exec_context(u
);
4046 /* This only copies in the ones that need memory */
4047 for (i
= 0; i
< _RLIMIT_MAX
; i
++)
4048 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4049 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4054 if (MANAGER_IS_USER(u
->manager
) &&
4055 !ec
->working_directory
) {
4057 r
= get_home_dir(&ec
->working_directory
);
4061 /* Allow user services to run, even if the
4062 * home directory is missing */
4063 ec
->working_directory_missing_ok
= true;
4066 if (ec
->private_devices
)
4067 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4069 if (ec
->protect_kernel_modules
)
4070 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4072 if (ec
->dynamic_user
) {
4074 r
= user_from_unit_name(u
, &ec
->user
);
4080 ec
->group
= strdup(ec
->user
);
4085 /* If the dynamic user option is on, let's make sure that the unit can't leave its UID/GID
4086 * around in the file system or on IPC objects. Hence enforce a strict sandbox. */
4088 ec
->private_tmp
= true;
4089 ec
->remove_ipc
= true;
4090 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4091 if (ec
->protect_home
== PROTECT_HOME_NO
)
4092 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4096 cc
= unit_get_cgroup_context(u
);
4100 ec
->private_devices
&&
4101 cc
->device_policy
== CGROUP_AUTO
)
4102 cc
->device_policy
= CGROUP_CLOSED
;
4108 ExecContext
*unit_get_exec_context(Unit
*u
) {
4115 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4119 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4122 KillContext
*unit_get_kill_context(Unit
*u
) {
4129 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4133 return (KillContext
*) ((uint8_t*) u
+ offset
);
4136 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4142 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4146 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4149 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4155 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4159 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4162 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4165 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4168 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4169 return u
->manager
->lookup_paths
.transient
;
4171 if (flags
& UNIT_PERSISTENT
)
4172 return u
->manager
->lookup_paths
.persistent_control
;
4174 if (flags
& UNIT_RUNTIME
)
4175 return u
->manager
->lookup_paths
.runtime_control
;
4180 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4186 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4187 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4188 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4189 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4190 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4193 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4194 ret
= specifier_escape(s
);
4201 if (flags
& UNIT_ESCAPE_C
) {
4214 return ret
?: (char*) s
;
4217 return ret
?: strdup(s
);
4220 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4221 _cleanup_free_
char *result
= NULL
;
4222 size_t n
= 0, allocated
= 0;
4225 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4226 * way suitable for ExecStart= stanzas */
4228 STRV_FOREACH(i
, l
) {
4229 _cleanup_free_
char *buf
= NULL
;
4234 p
= unit_escape_setting(*i
, flags
, &buf
);
4238 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4239 if (!GREEDY_REALLOC(result
, allocated
, n
+ a
+ 1))
4253 if (!GREEDY_REALLOC(result
, allocated
, n
+ 1))
4264 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4265 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4266 const char *dir
, *wrapped
;
4273 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4276 data
= unit_escape_setting(data
, flags
, &escaped
);
4280 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4281 * previous section header is the same */
4283 if (flags
& UNIT_PRIVATE
) {
4284 if (!UNIT_VTABLE(u
)->private_section
)
4287 if (!u
->transient_file
|| u
->last_section_private
< 0)
4288 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4289 else if (u
->last_section_private
== 0)
4290 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4292 if (!u
->transient_file
|| u
->last_section_private
< 0)
4293 data
= strjoina("[Unit]\n", data
);
4294 else if (u
->last_section_private
> 0)
4295 data
= strjoina("\n[Unit]\n", data
);
4298 if (u
->transient_file
) {
4299 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4300 * write to the transient unit file. */
4301 fputs(data
, u
->transient_file
);
4303 if (!endswith(data
, "\n"))
4304 fputc('\n', u
->transient_file
);
4306 /* Remember which section we wrote this entry to */
4307 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4311 dir
= unit_drop_in_dir(u
, flags
);
4315 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4316 "# or an equivalent operation. Do not edit.\n",
4320 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4324 (void) mkdir_p_label(p
, 0755);
4325 r
= write_string_file_atomic_label(q
, wrapped
);
4329 r
= strv_push(&u
->dropin_paths
, q
);
4334 strv_uniq(u
->dropin_paths
);
4336 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4341 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4342 _cleanup_free_
char *p
= NULL
;
4350 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4353 va_start(ap
, format
);
4354 r
= vasprintf(&p
, format
, ap
);
4360 return unit_write_setting(u
, flags
, name
, p
);
4363 int unit_make_transient(Unit
*u
) {
4364 _cleanup_free_
char *path
= NULL
;
4369 if (!UNIT_VTABLE(u
)->can_transient
)
4372 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4374 path
= strjoin(u
->manager
->lookup_paths
.transient
, "/", u
->id
);
4378 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4379 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4381 RUN_WITH_UMASK(0022) {
4382 f
= fopen(path
, "we");
4387 safe_fclose(u
->transient_file
);
4388 u
->transient_file
= f
;
4390 free_and_replace(u
->fragment_path
, path
);
4392 u
->source_path
= mfree(u
->source_path
);
4393 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4394 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4396 u
->load_state
= UNIT_STUB
;
4398 u
->transient
= true;
4400 unit_add_to_dbus_queue(u
);
4401 unit_add_to_gc_queue(u
);
4403 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4409 static void log_kill(pid_t pid
, int sig
, void *userdata
) {
4410 _cleanup_free_
char *comm
= NULL
;
4412 (void) get_process_comm(pid
, &comm
);
4414 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4415 only, like for example systemd's own PAM stub process. */
4416 if (comm
&& comm
[0] == '(')
4419 log_unit_notice(userdata
,
4420 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4423 signal_to_string(sig
));
4426 static int operation_to_signal(KillContext
*c
, KillOperation k
) {
4431 case KILL_TERMINATE
:
4432 case KILL_TERMINATE_AND_LOG
:
4433 return c
->kill_signal
;
4442 assert_not_reached("KillOperation unknown");
4446 int unit_kill_context(
4452 bool main_pid_alien
) {
4454 bool wait_for_exit
= false, send_sighup
;
4455 cg_kill_log_func_t log_func
= NULL
;
4461 /* Kill the processes belonging to this unit, in preparation for shutting the unit down.
4462 * Returns > 0 if we killed something worth waiting for, 0 otherwise. */
4464 if (c
->kill_mode
== KILL_NONE
)
4467 sig
= operation_to_signal(c
, k
);
4471 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4474 if (k
!= KILL_TERMINATE
|| IN_SET(sig
, SIGKILL
, SIGABRT
))
4475 log_func
= log_kill
;
4479 log_func(main_pid
, sig
, u
);
4481 r
= kill_and_sigcont(main_pid
, sig
);
4482 if (r
< 0 && r
!= -ESRCH
) {
4483 _cleanup_free_
char *comm
= NULL
;
4484 (void) get_process_comm(main_pid
, &comm
);
4486 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4488 if (!main_pid_alien
)
4489 wait_for_exit
= true;
4491 if (r
!= -ESRCH
&& send_sighup
)
4492 (void) kill(main_pid
, SIGHUP
);
4496 if (control_pid
> 0) {
4498 log_func(control_pid
, sig
, u
);
4500 r
= kill_and_sigcont(control_pid
, sig
);
4501 if (r
< 0 && r
!= -ESRCH
) {
4502 _cleanup_free_
char *comm
= NULL
;
4503 (void) get_process_comm(control_pid
, &comm
);
4505 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4507 wait_for_exit
= true;
4509 if (r
!= -ESRCH
&& send_sighup
)
4510 (void) kill(control_pid
, SIGHUP
);
4514 if (u
->cgroup_path
&&
4515 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4516 _cleanup_set_free_ Set
*pid_set
= NULL
;
4518 /* Exclude the main/control pids from being killed via the cgroup */
4519 pid_set
= unit_pid_set(main_pid
, control_pid
);
4523 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4525 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4529 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4530 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4534 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4535 * we are running in a container or if this is a delegation unit, simply because cgroup
4536 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4537 * of containers it can be confused easily by left-over directories in the cgroup — which
4538 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4539 * there we get proper events. Hence rely on them. */
4541 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4542 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4543 wait_for_exit
= true;
4548 pid_set
= unit_pid_set(main_pid
, control_pid
);
4552 cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4561 return wait_for_exit
;
4564 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4565 char prefix
[strlen(path
) + 1], *p
;
4566 UnitDependencyInfo di
;
4572 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these paths in
4573 * the unit (from the path to the UnitDependencyInfo structure indicating how to the dependency came to
4574 * be). However, we build a prefix table for all possible prefixes so that new appearing mount units can easily
4575 * determine which units to make themselves a dependency of. */
4577 if (!path_is_absolute(path
))
4580 r
= hashmap_ensure_allocated(&u
->requires_mounts_for
, &path_hash_ops
);
4588 path_kill_slashes(p
);
4590 if (!path_is_normalized(p
)) {
4595 if (hashmap_contains(u
->requires_mounts_for
, p
)) {
4600 di
= (UnitDependencyInfo
) {
4604 r
= hashmap_put(u
->requires_mounts_for
, p
, di
.data
);
4610 PATH_FOREACH_PREFIX_MORE(prefix
, p
) {
4613 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4617 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4631 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4647 int unit_setup_exec_runtime(Unit
*u
) {
4655 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4658 /* Check if there already is an ExecRuntime for this unit? */
4659 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4663 /* Try to get it from somebody else */
4664 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_JOINS_NAMESPACE_OF
], i
) {
4665 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4670 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4673 int unit_setup_dynamic_creds(Unit
*u
) {
4675 DynamicCreds
*dcreds
;
4680 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4682 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4684 ec
= unit_get_exec_context(u
);
4687 if (!ec
->dynamic_user
)
4690 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4693 bool unit_type_supported(UnitType t
) {
4694 if (_unlikely_(t
< 0))
4696 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4699 if (!unit_vtable
[t
]->supported
)
4702 return unit_vtable
[t
]->supported();
4705 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4711 r
= dir_is_empty(where
);
4712 if (r
> 0 || r
== -ENOTDIR
)
4715 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4719 log_struct(LOG_NOTICE
,
4720 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4722 LOG_UNIT_INVOCATION_ID(u
),
4723 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4728 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4729 _cleanup_free_
char *canonical_where
;
4735 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
);
4737 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4741 /* We will happily ignore a trailing slash (or any redundant slashes) */
4742 if (path_equal(where
, canonical_where
))
4745 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4747 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4749 LOG_UNIT_INVOCATION_ID(u
),
4750 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4757 bool unit_is_pristine(Unit
*u
) {
4760 /* Check if the unit already exists or is already around,
4761 * in a number of different ways. Note that to cater for unit
4762 * types such as slice, we are generally fine with units that
4763 * are marked UNIT_LOADED even though nothing was
4764 * actually loaded, as those unit types don't require a file
4765 * on disk to validly load. */
4767 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4770 !strv_isempty(u
->dropin_paths
) ||
4775 pid_t
unit_control_pid(Unit
*u
) {
4778 if (UNIT_VTABLE(u
)->control_pid
)
4779 return UNIT_VTABLE(u
)->control_pid(u
);
4784 pid_t
unit_main_pid(Unit
*u
) {
4787 if (UNIT_VTABLE(u
)->main_pid
)
4788 return UNIT_VTABLE(u
)->main_pid(u
);
4793 static void unit_unref_uid_internal(
4797 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4801 assert(_manager_unref_uid
);
4803 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4804 * gid_t are actually the same time, with the same validity rules.
4806 * Drops a reference to UID/GID from a unit. */
4808 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4809 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4811 if (!uid_is_valid(*ref_uid
))
4814 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4815 *ref_uid
= UID_INVALID
;
4818 void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4819 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4822 void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4823 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4826 static int unit_ref_uid_internal(
4831 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4837 assert(uid_is_valid(uid
));
4838 assert(_manager_ref_uid
);
4840 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4841 * are actually the same type, and have the same validity rules.
4843 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4844 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4847 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4848 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4850 if (*ref_uid
== uid
)
4853 if (uid_is_valid(*ref_uid
)) /* Already set? */
4856 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4864 int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4865 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4868 int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4869 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4872 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4877 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4879 if (uid_is_valid(uid
)) {
4880 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4885 if (gid_is_valid(gid
)) {
4886 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4889 unit_unref_uid(u
, false);
4895 return r
> 0 || q
> 0;
4898 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4904 c
= unit_get_exec_context(u
);
4906 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4908 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4913 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4916 unit_unref_uid(u
, destroy_now
);
4917 unit_unref_gid(u
, destroy_now
);
4920 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4925 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4926 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4927 * objects when no service references the UID/GID anymore. */
4929 r
= unit_ref_uid_gid(u
, uid
, gid
);
4931 bus_unit_send_change_signal(u
);
4934 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
4939 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
4941 if (sd_id128_equal(u
->invocation_id
, id
))
4944 if (!sd_id128_is_null(u
->invocation_id
))
4945 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4947 if (sd_id128_is_null(id
)) {
4952 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
4956 u
->invocation_id
= id
;
4957 sd_id128_to_string(id
, u
->invocation_id_string
);
4959 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4966 u
->invocation_id
= SD_ID128_NULL
;
4967 u
->invocation_id_string
[0] = 0;
4971 int unit_acquire_invocation_id(Unit
*u
) {
4977 r
= sd_id128_randomize(&id
);
4979 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4981 r
= unit_set_invocation_id(u
, id
);
4983 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
4988 void unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
4992 /* Copy parameters from manager */
4993 p
->environment
= u
->manager
->environment
;
4994 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
4995 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
4996 p
->prefix
= u
->manager
->prefix
;
4997 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
4999 /* Copy paramaters from unit */
5000 p
->cgroup_path
= u
->cgroup_path
;
5001 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5004 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5010 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5011 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5013 (void) unit_realize_cgroup(u
);
5015 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5019 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
, -1);
5020 (void) ignore_signals(SIGPIPE
, -1);
5022 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5024 if (u
->cgroup_path
) {
5025 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5027 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5035 static void unit_update_dependency_mask(Unit
*u
, UnitDependency d
, Unit
*other
, UnitDependencyInfo di
) {
5038 assert(d
< _UNIT_DEPENDENCY_MAX
);
5041 if (di
.origin_mask
== 0 && di
.destination_mask
== 0) {
5042 /* No bit set anymore, let's drop the whole entry */
5043 assert_se(hashmap_remove(u
->dependencies
[d
], other
));
5044 log_unit_debug(u
, "%s lost dependency %s=%s", u
->id
, unit_dependency_to_string(d
), other
->id
);
5046 /* Mask was reduced, let's update the entry */
5047 assert_se(hashmap_update(u
->dependencies
[d
], other
, di
.data
) == 0);
5050 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5055 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5060 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
5064 UnitDependencyInfo di
;
5070 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
5073 if ((di
.origin_mask
& ~mask
) == di
.origin_mask
)
5075 di
.origin_mask
&= ~mask
;
5076 unit_update_dependency_mask(u
, d
, other
, di
);
5078 /* We updated the dependency from our unit to the other unit now. But most dependencies
5079 * imply a reverse dependency. Hence, let's delete that one too. For that we go through
5080 * all dependency types on the other unit and delete all those which point to us and
5081 * have the right mask set. */
5083 for (q
= 0; q
< _UNIT_DEPENDENCY_MAX
; q
++) {
5084 UnitDependencyInfo dj
;
5086 dj
.data
= hashmap_get(other
->dependencies
[q
], u
);
5087 if ((dj
.destination_mask
& ~mask
) == dj
.destination_mask
)
5089 dj
.destination_mask
&= ~mask
;
5091 unit_update_dependency_mask(other
, q
, u
, dj
);
5094 unit_add_to_gc_queue(other
);
5104 static int unit_export_invocation_id(Unit
*u
) {
5110 if (u
->exported_invocation_id
)
5113 if (sd_id128_is_null(u
->invocation_id
))
5116 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5117 r
= symlink_atomic(u
->invocation_id_string
, p
);
5119 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5121 u
->exported_invocation_id
= true;
5125 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5133 if (u
->exported_log_level_max
)
5136 if (c
->log_level_max
< 0)
5139 assert(c
->log_level_max
<= 7);
5141 buf
[0] = '0' + c
->log_level_max
;
5144 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5145 r
= symlink_atomic(buf
, p
);
5147 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5149 u
->exported_log_level_max
= true;
5153 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5154 _cleanup_close_
int fd
= -1;
5155 struct iovec
*iovec
;
5163 if (u
->exported_log_extra_fields
)
5166 if (c
->n_log_extra_fields
<= 0)
5169 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5170 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5172 for (i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5173 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5175 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5176 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5179 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5180 pattern
= strjoina(p
, ".XXXXXX");
5182 fd
= mkostemp_safe(pattern
);
5184 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5186 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5188 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5192 (void) fchmod(fd
, 0644);
5194 if (rename(pattern
, p
) < 0) {
5195 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5199 u
->exported_log_extra_fields
= true;
5203 (void) unlink(pattern
);
5207 void unit_export_state_files(Unit
*u
) {
5208 const ExecContext
*c
;
5215 if (!MANAGER_IS_SYSTEM(u
->manager
))
5218 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5219 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5220 * the IPC system itself and PID 1 also log to the journal.
5222 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5223 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5224 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5225 * namespace at least.
5227 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5228 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5231 (void) unit_export_invocation_id(u
);
5233 c
= unit_get_exec_context(u
);
5235 (void) unit_export_log_level_max(u
, c
);
5236 (void) unit_export_log_extra_fields(u
, c
);
5240 void unit_unlink_state_files(Unit
*u
) {
5248 if (!MANAGER_IS_SYSTEM(u
->manager
))
5251 /* Undoes the effect of unit_export_state() */
5253 if (u
->exported_invocation_id
) {
5254 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5257 u
->exported_invocation_id
= false;
5260 if (u
->exported_log_level_max
) {
5261 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5264 u
->exported_log_level_max
= false;
5267 if (u
->exported_log_extra_fields
) {
5268 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5271 u
->exported_log_extra_fields
= false;
5275 int unit_prepare_exec(Unit
*u
) {
5280 /* Prepares everything so that we can fork of a process for this unit */
5282 (void) unit_realize_cgroup(u
);
5284 if (u
->reset_accounting
) {
5285 (void) unit_reset_cpu_accounting(u
);
5286 (void) unit_reset_ip_accounting(u
);
5287 u
->reset_accounting
= false;
5290 unit_export_state_files(u
);
5292 r
= unit_setup_exec_runtime(u
);
5296 r
= unit_setup_dynamic_creds(u
);
5303 static void log_leftover(pid_t pid
, int sig
, void *userdata
) {
5304 _cleanup_free_
char *comm
= NULL
;
5306 (void) get_process_comm(pid
, &comm
);
5308 if (comm
&& comm
[0] == '(') /* Most likely our own helper process (PAM?), ignore */
5311 log_unit_warning(userdata
,
5312 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5313 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5317 void unit_warn_leftover_processes(Unit
*u
) {
5320 (void) unit_pick_cgroup_path(u
);
5322 if (!u
->cgroup_path
)
5325 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_leftover
, u
);
5328 bool unit_needs_console(Unit
*u
) {
5330 UnitActiveState state
;
5334 state
= unit_active_state(u
);
5336 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5339 if (UNIT_VTABLE(u
)->needs_console
)
5340 return UNIT_VTABLE(u
)->needs_console(u
);
5342 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5343 ec
= unit_get_exec_context(u
);
5347 return exec_context_may_touch_console(ec
);
5350 const char *unit_label_path(Unit
*u
) {
5353 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5354 * when validating access checks. */
5356 p
= u
->source_path
?: u
->fragment_path
;
5360 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5361 if (path_equal(p
, "/dev/null"))
5367 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5372 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5373 * and not a kernel thread either */
5375 /* First, a simple range check */
5376 if (!pid_is_valid(pid
))
5377 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5379 /* Some extra safety check */
5380 if (pid
== 1 || pid
== getpid_cached())
5381 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager processs, refusing.", pid
);
5383 /* Don't even begin to bother with kernel threads */
5384 r
= is_kernel_thread(pid
);
5386 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5388 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5390 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5395 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5396 [COLLECT_INACTIVE
] = "inactive",
5397 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5400 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);