1 /* SPDX-License-Identifier: LGPL-2.1+ */
9 #include "sd-messages.h"
11 #include "all-units.h"
12 #include "alloc-util.h"
13 #include "bpf-firewall.h"
14 #include "bus-common-errors.h"
16 #include "cgroup-setup.h"
17 #include "cgroup-util.h"
18 #include "dbus-unit.h"
24 #include "fileio-label.h"
26 #include "format-util.h"
28 #include "id128-util.h"
31 #include "load-dropin.h"
32 #include "load-fragment.h"
35 #include "missing_audit.h"
37 #include "parse-util.h"
38 #include "path-util.h"
39 #include "process-util.h"
41 #include "serialize.h"
43 #include "signal-util.h"
44 #include "sparse-endian.h"
46 #include "specifier.h"
47 #include "stat-util.h"
48 #include "stdio-util.h"
49 #include "string-table.h"
50 #include "string-util.h"
52 #include "terminal-util.h"
53 #include "tmpfile-util.h"
54 #include "umask-util.h"
55 #include "unit-name.h"
57 #include "user-util.h"
60 /* Thresholds for logging at INFO level about resource consumption */
61 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
62 #define MENTIONWORTHY_IO_BYTES (1024 * 1024ULL)
63 #define MENTIONWORTHY_IP_BYTES (0ULL)
65 /* Thresholds for logging at INFO level about resource consumption */
66 #define NOTICEWORTHY_CPU_NSEC (10*60 * NSEC_PER_SEC) /* 10 minutes */
67 #define NOTICEWORTHY_IO_BYTES (10 * 1024 * 1024ULL) /* 10 MB */
68 #define NOTICEWORTHY_IP_BYTES (128 * 1024 * 1024ULL) /* 128 MB */
70 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
71 [UNIT_SERVICE
] = &service_vtable
,
72 [UNIT_SOCKET
] = &socket_vtable
,
73 [UNIT_TARGET
] = &target_vtable
,
74 [UNIT_DEVICE
] = &device_vtable
,
75 [UNIT_MOUNT
] = &mount_vtable
,
76 [UNIT_AUTOMOUNT
] = &automount_vtable
,
77 [UNIT_SWAP
] = &swap_vtable
,
78 [UNIT_TIMER
] = &timer_vtable
,
79 [UNIT_PATH
] = &path_vtable
,
80 [UNIT_SLICE
] = &slice_vtable
,
81 [UNIT_SCOPE
] = &scope_vtable
,
84 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
);
86 Unit
*unit_new(Manager
*m
, size_t size
) {
90 assert(size
>= sizeof(Unit
));
96 u
->names
= set_new(&string_hash_ops
);
101 u
->type
= _UNIT_TYPE_INVALID
;
102 u
->default_dependencies
= true;
103 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
104 u
->unit_file_preset
= -1;
105 u
->on_failure_job_mode
= JOB_REPLACE
;
106 u
->cgroup_control_inotify_wd
= -1;
107 u
->cgroup_memory_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_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
114 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
116 u
->ip_accounting_ingress_map_fd
= -1;
117 u
->ip_accounting_egress_map_fd
= -1;
118 u
->ipv4_allow_map_fd
= -1;
119 u
->ipv6_allow_map_fd
= -1;
120 u
->ipv4_deny_map_fd
= -1;
121 u
->ipv6_deny_map_fd
= -1;
123 u
->last_section_private
= -1;
125 u
->start_ratelimit
= (RateLimit
) { m
->default_start_limit_interval
, m
->default_start_limit_burst
};
126 u
->auto_stop_ratelimit
= (RateLimit
) { 10 * USEC_PER_SEC
, 16 };
128 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
129 u
->io_accounting_last
[i
] = UINT64_MAX
;
134 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
135 _cleanup_(unit_freep
) Unit
*u
= NULL
;
138 u
= unit_new(m
, size
);
142 r
= unit_add_name(u
, name
);
151 bool unit_has_name(const Unit
*u
, const char *name
) {
155 return set_contains(u
->names
, (char*) name
);
158 static void unit_init(Unit
*u
) {
165 assert(u
->type
>= 0);
167 cc
= unit_get_cgroup_context(u
);
169 cgroup_context_init(cc
);
171 /* Copy in the manager defaults into the cgroup
172 * context, _before_ the rest of the settings have
173 * been initialized */
175 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
176 cc
->io_accounting
= u
->manager
->default_io_accounting
;
177 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
178 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
179 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
180 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
182 if (u
->type
!= UNIT_SLICE
)
183 cc
->tasks_max
= u
->manager
->default_tasks_max
;
186 ec
= unit_get_exec_context(u
);
188 exec_context_init(ec
);
190 ec
->keyring_mode
= MANAGER_IS_SYSTEM(u
->manager
) ?
191 EXEC_KEYRING_SHARED
: EXEC_KEYRING_INHERIT
;
194 kc
= unit_get_kill_context(u
);
196 kill_context_init(kc
);
198 if (UNIT_VTABLE(u
)->init
)
199 UNIT_VTABLE(u
)->init(u
);
202 int unit_add_name(Unit
*u
, const char *text
) {
203 _cleanup_free_
char *s
= NULL
, *i
= NULL
;
210 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
213 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
214 "instance is not set when adding name '%s': %m", text
);
216 r
= unit_name_replace_instance(text
, u
->instance
, &s
);
218 return log_unit_debug_errno(u
, r
,
219 "failed to build instance name from '%s': %m", text
);
226 if (set_contains(u
->names
, s
))
228 if (hashmap_contains(u
->manager
->units
, s
))
229 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
230 "unit already exist when adding name '%s': %m", text
);
232 if (!unit_name_is_valid(s
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
233 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
234 "name '%s' is invalid: %m", text
);
236 t
= unit_name_to_type(s
);
238 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
239 "failed to to derive unit type from name '%s': %m", text
);
241 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
242 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
243 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
246 r
= unit_name_to_instance(s
, &i
);
248 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", text
);
250 if (i
&& !unit_type_may_template(t
))
251 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", text
);
253 /* Ensure that this unit is either instanced or not instanced,
254 * but not both. Note that we do allow names with different
255 * instance names however! */
256 if (u
->type
!= _UNIT_TYPE_INVALID
&& !u
->instance
!= !i
)
257 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
258 "instance is illegal: u->type(%d), u->instance(%s) and i(%s) for name '%s': %m",
259 u
->type
, u
->instance
, i
, text
);
261 if (!unit_type_may_alias(t
) && !set_isempty(u
->names
))
262 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
), "symlinks are not allowed for name '%s': %m", text
);
264 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
265 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "too many units: %m");
267 r
= set_put(u
->names
, s
);
272 r
= hashmap_put(u
->manager
->units
, s
, u
);
274 (void) set_remove(u
->names
, s
);
275 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
278 if (u
->type
== _UNIT_TYPE_INVALID
) {
281 u
->instance
= TAKE_PTR(i
);
283 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
290 unit_add_to_dbus_queue(u
);
294 int unit_choose_id(Unit
*u
, const char *name
) {
295 _cleanup_free_
char *t
= NULL
;
302 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
307 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
314 /* Selects one of the names of this unit as the id */
315 s
= set_get(u
->names
, (char*) name
);
319 /* Determine the new instance from the new id */
320 r
= unit_name_to_instance(s
, &i
);
329 unit_add_to_dbus_queue(u
);
334 int unit_set_description(Unit
*u
, const char *description
) {
339 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
343 unit_add_to_dbus_queue(u
);
348 bool unit_may_gc(Unit
*u
) {
349 UnitActiveState state
;
354 /* Checks whether the unit is ready to be unloaded for garbage collection.
355 * Returns true when the unit may be collected, and false if there's some
356 * reason to keep it loaded.
358 * References from other units are *not* checked here. Instead, this is done
359 * in unit_gc_sweep(), but using markers to properly collect dependency loops.
368 state
= unit_active_state(u
);
370 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
371 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
372 UNIT_VTABLE(u
)->release_resources
)
373 UNIT_VTABLE(u
)->release_resources(u
);
378 if (sd_bus_track_count(u
->bus_track
) > 0)
381 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
382 switch (u
->collect_mode
) {
384 case COLLECT_INACTIVE
:
385 if (state
!= UNIT_INACTIVE
)
390 case COLLECT_INACTIVE_OR_FAILED
:
391 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
397 assert_not_reached("Unknown garbage collection mode");
400 if (u
->cgroup_path
) {
401 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
402 * around. Units with active processes should never be collected. */
404 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
406 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
411 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_gc(u
))
417 void unit_add_to_load_queue(Unit
*u
) {
419 assert(u
->type
!= _UNIT_TYPE_INVALID
);
421 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
424 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
425 u
->in_load_queue
= true;
428 void unit_add_to_cleanup_queue(Unit
*u
) {
431 if (u
->in_cleanup_queue
)
434 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
435 u
->in_cleanup_queue
= true;
438 void unit_add_to_gc_queue(Unit
*u
) {
441 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
447 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
448 u
->in_gc_queue
= true;
451 void unit_add_to_dbus_queue(Unit
*u
) {
453 assert(u
->type
!= _UNIT_TYPE_INVALID
);
455 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
458 /* Shortcut things if nobody cares */
459 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
460 sd_bus_track_count(u
->bus_track
) <= 0 &&
461 set_isempty(u
->manager
->private_buses
)) {
462 u
->sent_dbus_new_signal
= true;
466 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
467 u
->in_dbus_queue
= true;
470 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
473 if (u
->in_stop_when_unneeded_queue
)
476 if (!u
->stop_when_unneeded
)
479 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
482 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
483 u
->in_stop_when_unneeded_queue
= true;
486 static void bidi_set_free(Unit
*u
, Hashmap
*h
) {
493 /* Frees the hashmap and makes sure we are dropped from the inverse pointers */
495 HASHMAP_FOREACH_KEY(v
, other
, h
, i
) {
498 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
499 hashmap_remove(other
->dependencies
[d
], u
);
501 unit_add_to_gc_queue(other
);
507 static void unit_remove_transient(Unit
*u
) {
515 if (u
->fragment_path
)
516 (void) unlink(u
->fragment_path
);
518 STRV_FOREACH(i
, u
->dropin_paths
) {
519 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
521 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
525 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
529 /* Only drop transient drop-ins */
530 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
538 static void unit_free_requires_mounts_for(Unit
*u
) {
542 _cleanup_free_
char *path
;
544 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
548 char s
[strlen(path
) + 1];
550 PATH_FOREACH_PREFIX_MORE(s
, path
) {
554 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
558 (void) set_remove(x
, u
);
560 if (set_isempty(x
)) {
561 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
569 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
572 static void unit_done(Unit
*u
) {
581 if (UNIT_VTABLE(u
)->done
)
582 UNIT_VTABLE(u
)->done(u
);
584 ec
= unit_get_exec_context(u
);
586 exec_context_done(ec
);
588 cc
= unit_get_cgroup_context(u
);
590 cgroup_context_done(cc
);
593 void unit_free(Unit
*u
) {
601 if (UNIT_ISSET(u
->slice
)) {
602 /* A unit is being dropped from the tree, make sure our parent slice recalculates the member mask */
603 unit_invalidate_cgroup_members_masks(UNIT_DEREF(u
->slice
));
605 /* And make sure the parent is realized again, updating cgroup memberships */
606 unit_add_to_cgroup_realize_queue(UNIT_DEREF(u
->slice
));
609 u
->transient_file
= safe_fclose(u
->transient_file
);
611 if (!MANAGER_IS_RELOADING(u
->manager
))
612 unit_remove_transient(u
);
614 bus_unit_send_removed_signal(u
);
618 unit_dequeue_rewatch_pids(u
);
620 sd_bus_slot_unref(u
->match_bus_slot
);
621 sd_bus_track_unref(u
->bus_track
);
622 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
624 unit_free_requires_mounts_for(u
);
626 SET_FOREACH(t
, u
->names
, i
)
627 hashmap_remove_value(u
->manager
->units
, t
, u
);
629 if (!sd_id128_is_null(u
->invocation_id
))
630 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
644 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
645 bidi_set_free(u
, u
->dependencies
[d
]);
648 manager_unref_console(u
->manager
);
650 unit_release_cgroup(u
);
652 if (!MANAGER_IS_RELOADING(u
->manager
))
653 unit_unlink_state_files(u
);
655 unit_unref_uid_gid(u
, false);
657 (void) manager_update_failed_units(u
->manager
, u
, false);
658 set_remove(u
->manager
->startup_units
, u
);
660 unit_unwatch_all_pids(u
);
662 unit_ref_unset(&u
->slice
);
663 while (u
->refs_by_target
)
664 unit_ref_unset(u
->refs_by_target
);
666 if (u
->type
!= _UNIT_TYPE_INVALID
)
667 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
669 if (u
->in_load_queue
)
670 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
672 if (u
->in_dbus_queue
)
673 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
676 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
678 if (u
->in_cgroup_realize_queue
)
679 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
681 if (u
->in_cgroup_empty_queue
)
682 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
684 if (u
->in_cleanup_queue
)
685 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
687 if (u
->in_target_deps_queue
)
688 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
690 if (u
->in_stop_when_unneeded_queue
)
691 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
693 safe_close(u
->ip_accounting_ingress_map_fd
);
694 safe_close(u
->ip_accounting_egress_map_fd
);
696 safe_close(u
->ipv4_allow_map_fd
);
697 safe_close(u
->ipv6_allow_map_fd
);
698 safe_close(u
->ipv4_deny_map_fd
);
699 safe_close(u
->ipv6_deny_map_fd
);
701 bpf_program_unref(u
->ip_bpf_ingress
);
702 bpf_program_unref(u
->ip_bpf_ingress_installed
);
703 bpf_program_unref(u
->ip_bpf_egress
);
704 bpf_program_unref(u
->ip_bpf_egress_installed
);
706 set_free(u
->ip_bpf_custom_ingress
);
707 set_free(u
->ip_bpf_custom_egress
);
708 set_free(u
->ip_bpf_custom_ingress_installed
);
709 set_free(u
->ip_bpf_custom_egress_installed
);
711 bpf_program_unref(u
->bpf_device_control_installed
);
713 condition_free_list(u
->conditions
);
714 condition_free_list(u
->asserts
);
716 free(u
->description
);
717 strv_free(u
->documentation
);
718 free(u
->fragment_path
);
719 free(u
->source_path
);
720 strv_free(u
->dropin_paths
);
723 free(u
->job_timeout_reboot_arg
);
725 set_free_free(u
->names
);
732 UnitActiveState
unit_active_state(Unit
*u
) {
735 if (u
->load_state
== UNIT_MERGED
)
736 return unit_active_state(unit_follow_merge(u
));
738 /* After a reload it might happen that a unit is not correctly
739 * loaded but still has a process around. That's why we won't
740 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
742 return UNIT_VTABLE(u
)->active_state(u
);
745 const char* unit_sub_state_to_string(Unit
*u
) {
748 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
751 static int set_complete_move(Set
**s
, Set
**other
) {
759 return set_move(*s
, *other
);
761 *s
= TAKE_PTR(*other
);
766 static int hashmap_complete_move(Hashmap
**s
, Hashmap
**other
) {
774 return hashmap_move(*s
, *other
);
776 *s
= TAKE_PTR(*other
);
781 static int merge_names(Unit
*u
, Unit
*other
) {
789 r
= set_complete_move(&u
->names
, &other
->names
);
793 set_free_free(other
->names
);
797 SET_FOREACH(t
, u
->names
, i
)
798 assert_se(hashmap_replace(u
->manager
->units
, t
, u
) == 0);
803 static int reserve_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
808 assert(d
< _UNIT_DEPENDENCY_MAX
);
811 * If u does not have this dependency set allocated, there is no need
812 * to reserve anything. In that case other's set will be transferred
813 * as a whole to u by complete_move().
815 if (!u
->dependencies
[d
])
818 /* merge_dependencies() will skip a u-on-u dependency */
819 n_reserve
= hashmap_size(other
->dependencies
[d
]) - !!hashmap_get(other
->dependencies
[d
], u
);
821 return hashmap_reserve(u
->dependencies
[d
], n_reserve
);
824 static void merge_dependencies(Unit
*u
, Unit
*other
, const char *other_id
, UnitDependency d
) {
830 /* Merges all dependencies of type 'd' of the unit 'other' into the deps of the unit 'u' */
834 assert(d
< _UNIT_DEPENDENCY_MAX
);
836 /* Fix backwards pointers. Let's iterate through all dependent units of the other unit. */
837 HASHMAP_FOREACH_KEY(v
, back
, other
->dependencies
[d
], i
) {
840 /* Let's now iterate through the dependencies of that dependencies of the other units, looking for
841 * pointers back, and let's fix them up, to instead point to 'u'. */
843 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++) {
845 /* Do not add dependencies between u and itself. */
846 if (hashmap_remove(back
->dependencies
[k
], other
))
847 maybe_warn_about_dependency(u
, other_id
, k
);
849 UnitDependencyInfo di_u
, di_other
, di_merged
;
851 /* Let's drop this dependency between "back" and "other", and let's create it between
852 * "back" and "u" instead. Let's merge the bit masks of the dependency we are moving,
853 * and any such dependency which might already exist */
855 di_other
.data
= hashmap_get(back
->dependencies
[k
], other
);
857 continue; /* dependency isn't set, let's try the next one */
859 di_u
.data
= hashmap_get(back
->dependencies
[k
], u
);
861 di_merged
= (UnitDependencyInfo
) {
862 .origin_mask
= di_u
.origin_mask
| di_other
.origin_mask
,
863 .destination_mask
= di_u
.destination_mask
| di_other
.destination_mask
,
866 r
= hashmap_remove_and_replace(back
->dependencies
[k
], other
, u
, di_merged
.data
);
868 log_warning_errno(r
, "Failed to remove/replace: back=%s other=%s u=%s: %m", back
->id
, other_id
, u
->id
);
871 /* assert_se(hashmap_remove_and_replace(back->dependencies[k], other, u, di_merged.data) >= 0); */
877 /* Also do not move dependencies on u to itself */
878 back
= hashmap_remove(other
->dependencies
[d
], u
);
880 maybe_warn_about_dependency(u
, other_id
, d
);
882 /* The move cannot fail. The caller must have performed a reservation. */
883 assert_se(hashmap_complete_move(&u
->dependencies
[d
], &other
->dependencies
[d
]) == 0);
885 other
->dependencies
[d
] = hashmap_free(other
->dependencies
[d
]);
888 int unit_merge(Unit
*u
, Unit
*other
) {
890 const char *other_id
= NULL
;
895 assert(u
->manager
== other
->manager
);
896 assert(u
->type
!= _UNIT_TYPE_INVALID
);
898 other
= unit_follow_merge(other
);
903 if (u
->type
!= other
->type
)
906 if (!u
->instance
!= !other
->instance
)
909 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
912 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
921 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
925 other_id
= strdupa(other
->id
);
927 /* Make reservations to ensure merge_dependencies() won't fail */
928 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
929 r
= reserve_dependencies(u
, other
, d
);
931 * We don't rollback reservations if we fail. We don't have
932 * a way to undo reservations. A reservation is not a leak.
939 r
= merge_names(u
, other
);
943 /* Redirect all references */
944 while (other
->refs_by_target
)
945 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
947 /* Merge dependencies */
948 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
949 merge_dependencies(u
, other
, other_id
, d
);
951 other
->load_state
= UNIT_MERGED
;
952 other
->merged_into
= u
;
954 /* If there is still some data attached to the other node, we
955 * don't need it anymore, and can free it. */
956 if (other
->load_state
!= UNIT_STUB
)
957 if (UNIT_VTABLE(other
)->done
)
958 UNIT_VTABLE(other
)->done(other
);
960 unit_add_to_dbus_queue(u
);
961 unit_add_to_cleanup_queue(other
);
966 int unit_merge_by_name(Unit
*u
, const char *name
) {
967 _cleanup_free_
char *s
= NULL
;
971 /* Either add name to u, or if a unit with name already exists, merge it with u.
972 * If name is a template, do the same for name@instance, where instance is u's instance. */
977 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
981 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
988 other
= manager_get_unit(u
->manager
, name
);
990 return unit_merge(u
, other
);
992 return unit_add_name(u
, name
);
995 Unit
* unit_follow_merge(Unit
*u
) {
998 while (u
->load_state
== UNIT_MERGED
)
999 assert_se(u
= u
->merged_into
);
1004 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1005 ExecDirectoryType dt
;
1012 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1013 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1018 if (c
->root_directory
) {
1019 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1024 if (c
->root_image
) {
1025 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1030 for (dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1031 if (!u
->manager
->prefix
[dt
])
1034 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
1035 _cleanup_free_
char *p
;
1037 p
= path_join(u
->manager
->prefix
[dt
], *dp
);
1041 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1047 if (!MANAGER_IS_SYSTEM(u
->manager
))
1050 if (c
->private_tmp
) {
1053 FOREACH_STRING(p
, "/tmp", "/var/tmp") {
1054 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1059 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1064 if (!IN_SET(c
->std_output
,
1065 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1066 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1067 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
) &&
1068 !IN_SET(c
->std_error
,
1069 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1070 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1071 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
) &&
1075 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1078 if (c
->log_namespace
) {
1079 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1081 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1085 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1089 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1093 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1097 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1104 const char *unit_description(Unit
*u
) {
1108 return u
->description
;
1110 return strna(u
->id
);
1113 const char *unit_status_string(Unit
*u
) {
1116 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
&& u
->id
)
1119 return unit_description(u
);
1122 static void print_unit_dependency_mask(FILE *f
, const char *kind
, UnitDependencyMask mask
, bool *space
) {
1124 UnitDependencyMask mask
;
1127 { UNIT_DEPENDENCY_FILE
, "file" },
1128 { UNIT_DEPENDENCY_IMPLICIT
, "implicit" },
1129 { UNIT_DEPENDENCY_DEFAULT
, "default" },
1130 { UNIT_DEPENDENCY_UDEV
, "udev" },
1131 { UNIT_DEPENDENCY_PATH
, "path" },
1132 { UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
, "mountinfo-implicit" },
1133 { UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
, "mountinfo-default" },
1134 { UNIT_DEPENDENCY_PROC_SWAP
, "proc-swap" },
1142 for (i
= 0; i
< ELEMENTSOF(table
); i
++) {
1147 if (FLAGS_SET(mask
, table
[i
].mask
)) {
1155 fputs(table
[i
].name
, f
);
1157 mask
&= ~table
[i
].mask
;
1164 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
1168 const char *prefix2
;
1169 char timestamp
[5][FORMAT_TIMESTAMP_MAX
], timespan
[FORMAT_TIMESPAN_MAX
];
1171 _cleanup_set_free_ Set
*following_set
= NULL
;
1177 assert(u
->type
>= 0);
1179 prefix
= strempty(prefix
);
1180 prefix2
= strjoina(prefix
, "\t");
1186 SET_FOREACH(t
, u
->names
, i
)
1187 if (!streq(t
, u
->id
))
1188 fprintf(f
, "%s\tAlias: %s\n", prefix
, t
);
1191 "%s\tDescription: %s\n"
1192 "%s\tInstance: %s\n"
1193 "%s\tUnit Load State: %s\n"
1194 "%s\tUnit Active State: %s\n"
1195 "%s\tState Change Timestamp: %s\n"
1196 "%s\tInactive Exit Timestamp: %s\n"
1197 "%s\tActive Enter Timestamp: %s\n"
1198 "%s\tActive Exit Timestamp: %s\n"
1199 "%s\tInactive Enter Timestamp: %s\n"
1201 "%s\tNeed Daemon Reload: %s\n"
1202 "%s\tTransient: %s\n"
1203 "%s\tPerpetual: %s\n"
1204 "%s\tGarbage Collection Mode: %s\n"
1207 "%s\tCGroup realized: %s\n",
1208 prefix
, unit_description(u
),
1209 prefix
, strna(u
->instance
),
1210 prefix
, unit_load_state_to_string(u
->load_state
),
1211 prefix
, unit_active_state_to_string(unit_active_state(u
)),
1212 prefix
, strna(format_timestamp(timestamp
[0], sizeof(timestamp
[0]), u
->state_change_timestamp
.realtime
)),
1213 prefix
, strna(format_timestamp(timestamp
[1], sizeof(timestamp
[1]), u
->inactive_exit_timestamp
.realtime
)),
1214 prefix
, strna(format_timestamp(timestamp
[2], sizeof(timestamp
[2]), u
->active_enter_timestamp
.realtime
)),
1215 prefix
, strna(format_timestamp(timestamp
[3], sizeof(timestamp
[3]), u
->active_exit_timestamp
.realtime
)),
1216 prefix
, strna(format_timestamp(timestamp
[4], sizeof(timestamp
[4]), u
->inactive_enter_timestamp
.realtime
)),
1217 prefix
, yes_no(unit_may_gc(u
)),
1218 prefix
, yes_no(unit_need_daemon_reload(u
)),
1219 prefix
, yes_no(u
->transient
),
1220 prefix
, yes_no(u
->perpetual
),
1221 prefix
, collect_mode_to_string(u
->collect_mode
),
1222 prefix
, strna(unit_slice_name(u
)),
1223 prefix
, strna(u
->cgroup_path
),
1224 prefix
, yes_no(u
->cgroup_realized
));
1226 if (u
->cgroup_realized_mask
!= 0) {
1227 _cleanup_free_
char *s
= NULL
;
1228 (void) cg_mask_to_string(u
->cgroup_realized_mask
, &s
);
1229 fprintf(f
, "%s\tCGroup realized mask: %s\n", prefix
, strnull(s
));
1232 if (u
->cgroup_enabled_mask
!= 0) {
1233 _cleanup_free_
char *s
= NULL
;
1234 (void) cg_mask_to_string(u
->cgroup_enabled_mask
, &s
);
1235 fprintf(f
, "%s\tCGroup enabled mask: %s\n", prefix
, strnull(s
));
1238 m
= unit_get_own_mask(u
);
1240 _cleanup_free_
char *s
= NULL
;
1241 (void) cg_mask_to_string(m
, &s
);
1242 fprintf(f
, "%s\tCGroup own mask: %s\n", prefix
, strnull(s
));
1245 m
= unit_get_members_mask(u
);
1247 _cleanup_free_
char *s
= NULL
;
1248 (void) cg_mask_to_string(m
, &s
);
1249 fprintf(f
, "%s\tCGroup members mask: %s\n", prefix
, strnull(s
));
1252 m
= unit_get_delegate_mask(u
);
1254 _cleanup_free_
char *s
= NULL
;
1255 (void) cg_mask_to_string(m
, &s
);
1256 fprintf(f
, "%s\tCGroup delegate mask: %s\n", prefix
, strnull(s
));
1259 if (!sd_id128_is_null(u
->invocation_id
))
1260 fprintf(f
, "%s\tInvocation ID: " SD_ID128_FORMAT_STR
"\n",
1261 prefix
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
1263 STRV_FOREACH(j
, u
->documentation
)
1264 fprintf(f
, "%s\tDocumentation: %s\n", prefix
, *j
);
1266 following
= unit_following(u
);
1268 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->id
);
1270 r
= unit_following_set(u
, &following_set
);
1274 SET_FOREACH(other
, following_set
, i
)
1275 fprintf(f
, "%s\tFollowing Set Member: %s\n", prefix
, other
->id
);
1278 if (u
->fragment_path
)
1279 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->fragment_path
);
1282 fprintf(f
, "%s\tSource Path: %s\n", prefix
, u
->source_path
);
1284 STRV_FOREACH(j
, u
->dropin_paths
)
1285 fprintf(f
, "%s\tDropIn Path: %s\n", prefix
, *j
);
1287 if (u
->failure_action
!= EMERGENCY_ACTION_NONE
)
1288 fprintf(f
, "%s\tFailure Action: %s\n", prefix
, emergency_action_to_string(u
->failure_action
));
1289 if (u
->failure_action_exit_status
>= 0)
1290 fprintf(f
, "%s\tFailure Action Exit Status: %i\n", prefix
, u
->failure_action_exit_status
);
1291 if (u
->success_action
!= EMERGENCY_ACTION_NONE
)
1292 fprintf(f
, "%s\tSuccess Action: %s\n", prefix
, emergency_action_to_string(u
->success_action
));
1293 if (u
->success_action_exit_status
>= 0)
1294 fprintf(f
, "%s\tSuccess Action Exit Status: %i\n", prefix
, u
->success_action_exit_status
);
1296 if (u
->job_timeout
!= USEC_INFINITY
)
1297 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->job_timeout
, 0));
1299 if (u
->job_timeout_action
!= EMERGENCY_ACTION_NONE
)
1300 fprintf(f
, "%s\tJob Timeout Action: %s\n", prefix
, emergency_action_to_string(u
->job_timeout_action
));
1302 if (u
->job_timeout_reboot_arg
)
1303 fprintf(f
, "%s\tJob Timeout Reboot Argument: %s\n", prefix
, u
->job_timeout_reboot_arg
);
1305 condition_dump_list(u
->conditions
, f
, prefix
, condition_type_to_string
);
1306 condition_dump_list(u
->asserts
, f
, prefix
, assert_type_to_string
);
1308 if (dual_timestamp_is_set(&u
->condition_timestamp
))
1310 "%s\tCondition Timestamp: %s\n"
1311 "%s\tCondition Result: %s\n",
1312 prefix
, strna(format_timestamp(timestamp
[0], sizeof(timestamp
[0]), u
->condition_timestamp
.realtime
)),
1313 prefix
, yes_no(u
->condition_result
));
1315 if (dual_timestamp_is_set(&u
->assert_timestamp
))
1317 "%s\tAssert Timestamp: %s\n"
1318 "%s\tAssert Result: %s\n",
1319 prefix
, strna(format_timestamp(timestamp
[0], sizeof(timestamp
[0]), u
->assert_timestamp
.realtime
)),
1320 prefix
, yes_no(u
->assert_result
));
1322 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
1323 UnitDependencyInfo di
;
1326 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
1329 fprintf(f
, "%s\t%s: %s (", prefix
, unit_dependency_to_string(d
), other
->id
);
1331 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1332 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1338 if (!hashmap_isempty(u
->requires_mounts_for
)) {
1339 UnitDependencyInfo di
;
1342 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1345 fprintf(f
, "%s\tRequiresMountsFor: %s (", prefix
, path
);
1347 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1348 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1354 if (u
->load_state
== UNIT_LOADED
) {
1357 "%s\tStopWhenUnneeded: %s\n"
1358 "%s\tRefuseManualStart: %s\n"
1359 "%s\tRefuseManualStop: %s\n"
1360 "%s\tDefaultDependencies: %s\n"
1361 "%s\tOnFailureJobMode: %s\n"
1362 "%s\tIgnoreOnIsolate: %s\n",
1363 prefix
, yes_no(u
->stop_when_unneeded
),
1364 prefix
, yes_no(u
->refuse_manual_start
),
1365 prefix
, yes_no(u
->refuse_manual_stop
),
1366 prefix
, yes_no(u
->default_dependencies
),
1367 prefix
, job_mode_to_string(u
->on_failure_job_mode
),
1368 prefix
, yes_no(u
->ignore_on_isolate
));
1370 if (UNIT_VTABLE(u
)->dump
)
1371 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
1373 } else if (u
->load_state
== UNIT_MERGED
)
1375 "%s\tMerged into: %s\n",
1376 prefix
, u
->merged_into
->id
);
1377 else if (u
->load_state
== UNIT_ERROR
)
1378 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror_safe(u
->load_error
));
1380 for (n
= sd_bus_track_first(u
->bus_track
); n
; n
= sd_bus_track_next(u
->bus_track
))
1381 fprintf(f
, "%s\tBus Ref: %s\n", prefix
, n
);
1384 job_dump(u
->job
, f
, prefix2
);
1387 job_dump(u
->nop_job
, f
, prefix2
);
1390 /* Common implementation for multiple backends */
1391 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1396 /* Load a .{service,socket,...} file */
1397 r
= unit_load_fragment(u
);
1401 if (u
->load_state
== UNIT_STUB
) {
1402 if (fragment_required
)
1405 u
->load_state
= UNIT_LOADED
;
1408 /* Load drop-in directory data. If u is an alias, we might be reloading the
1409 * target unit needlessly. But we cannot be sure which drops-ins have already
1410 * been loaded and which not, at least without doing complicated book-keeping,
1411 * so let's always reread all drop-ins. */
1412 return unit_load_dropin(unit_follow_merge(u
));
1415 void unit_add_to_target_deps_queue(Unit
*u
) {
1416 Manager
*m
= u
->manager
;
1420 if (u
->in_target_deps_queue
)
1423 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1424 u
->in_target_deps_queue
= true;
1427 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1431 if (target
->type
!= UNIT_TARGET
)
1434 /* Only add the dependency if both units are loaded, so that
1435 * that loop check below is reliable */
1436 if (u
->load_state
!= UNIT_LOADED
||
1437 target
->load_state
!= UNIT_LOADED
)
1440 /* If either side wants no automatic dependencies, then let's
1442 if (!u
->default_dependencies
||
1443 !target
->default_dependencies
)
1446 /* Don't create loops */
1447 if (hashmap_get(target
->dependencies
[UNIT_BEFORE
], u
))
1450 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1453 static int unit_add_slice_dependencies(Unit
*u
) {
1454 UnitDependencyMask mask
;
1457 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1460 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1461 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1463 mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1465 if (UNIT_ISSET(u
->slice
))
1466 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, UNIT_DEREF(u
->slice
), true, mask
);
1468 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1471 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1474 static int unit_add_mount_dependencies(Unit
*u
) {
1475 UnitDependencyInfo di
;
1482 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1483 char prefix
[strlen(path
) + 1];
1485 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1486 _cleanup_free_
char *p
= NULL
;
1489 r
= unit_name_from_path(prefix
, ".mount", &p
);
1493 m
= manager_get_unit(u
->manager
, p
);
1495 /* Make sure to load the mount unit if
1496 * it exists. If so the dependencies
1497 * on this unit will be added later
1498 * during the loading of the mount
1500 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1506 if (m
->load_state
!= UNIT_LOADED
)
1509 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1513 if (m
->fragment_path
) {
1514 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1524 static int unit_add_startup_units(Unit
*u
) {
1528 c
= unit_get_cgroup_context(u
);
1532 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1533 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1534 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1537 r
= set_ensure_allocated(&u
->manager
->startup_units
, NULL
);
1541 return set_put(u
->manager
->startup_units
, u
);
1544 int unit_load(Unit
*u
) {
1549 if (u
->in_load_queue
) {
1550 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1551 u
->in_load_queue
= false;
1554 if (u
->type
== _UNIT_TYPE_INVALID
)
1557 if (u
->load_state
!= UNIT_STUB
)
1560 if (u
->transient_file
) {
1561 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1562 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1564 r
= fflush_and_check(u
->transient_file
);
1568 u
->transient_file
= safe_fclose(u
->transient_file
);
1569 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1572 r
= UNIT_VTABLE(u
)->load(u
);
1576 assert(u
->load_state
!= UNIT_STUB
);
1578 if (u
->load_state
== UNIT_LOADED
) {
1579 unit_add_to_target_deps_queue(u
);
1581 r
= unit_add_slice_dependencies(u
);
1585 r
= unit_add_mount_dependencies(u
);
1589 r
= unit_add_startup_units(u
);
1593 if (u
->on_failure_job_mode
== JOB_ISOLATE
&& hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) > 1) {
1594 log_unit_error(u
, "More than one OnFailure= dependencies specified but OnFailureJobMode=isolate set. Refusing.");
1599 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1600 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1602 /* We finished loading, let's ensure our parents recalculate the members mask */
1603 unit_invalidate_cgroup_members_masks(u
);
1606 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1608 unit_add_to_dbus_queue(unit_follow_merge(u
));
1609 unit_add_to_gc_queue(u
);
1614 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code should hence
1615 * return ENOEXEC to ensure units are placed in this state after loading */
1617 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1618 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1622 unit_add_to_dbus_queue(u
);
1623 unit_add_to_gc_queue(u
);
1625 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1629 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1634 va_start(ap
, format
);
1636 r
= log_object_internalv(level
, error
, file
, line
, func
,
1637 u
->manager
->unit_log_field
,
1639 u
->manager
->invocation_log_field
,
1640 u
->invocation_id_string
,
1643 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1649 static bool unit_test_condition(Unit
*u
) {
1652 dual_timestamp_get(&u
->condition_timestamp
);
1653 u
->condition_result
= condition_test_list(u
->conditions
, condition_type_to_string
, log_unit_internal
, u
);
1655 unit_add_to_dbus_queue(u
);
1657 return u
->condition_result
;
1660 static bool unit_test_assert(Unit
*u
) {
1663 dual_timestamp_get(&u
->assert_timestamp
);
1664 u
->assert_result
= condition_test_list(u
->asserts
, assert_type_to_string
, log_unit_internal
, u
);
1666 unit_add_to_dbus_queue(u
);
1668 return u
->assert_result
;
1671 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *unit_status_msg_format
) {
1674 d
= unit_status_string(u
);
1675 if (log_get_show_color())
1676 d
= strjoina(ANSI_HIGHLIGHT
, d
, ANSI_NORMAL
);
1678 DISABLE_WARNING_FORMAT_NONLITERAL
;
1679 manager_status_printf(u
->manager
, status_type
, status
, unit_status_msg_format
, d
);
1683 int unit_test_start_limit(Unit
*u
) {
1688 if (ratelimit_below(&u
->start_ratelimit
)) {
1689 u
->start_limit_hit
= false;
1693 log_unit_warning(u
, "Start request repeated too quickly.");
1694 u
->start_limit_hit
= true;
1696 reason
= strjoina("unit ", u
->id
, " failed");
1698 emergency_action(u
->manager
, u
->start_limit_action
,
1699 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1700 u
->reboot_arg
, -1, reason
);
1705 bool unit_shall_confirm_spawn(Unit
*u
) {
1708 if (manager_is_confirm_spawn_disabled(u
->manager
))
1711 /* For some reasons units remaining in the same process group
1712 * as PID 1 fail to acquire the console even if it's not used
1713 * by any process. So skip the confirmation question for them. */
1714 return !unit_get_exec_context(u
)->same_pgrp
;
1717 static bool unit_verify_deps(Unit
*u
) {
1724 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined with
1725 * After=. We do not check Requires= or Requisite= here as they only should have an effect on the job
1726 * processing, but do not have any effect afterwards. We don't check BindsTo= dependencies that are not used in
1727 * conjunction with After= as for them any such check would make things entirely racy. */
1729 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], j
) {
1731 if (!hashmap_contains(u
->dependencies
[UNIT_AFTER
], other
))
1734 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1735 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1743 /* Errors that aren't really errors:
1744 * -EALREADY: Unit is already started.
1745 * -ECOMM: Condition failed
1746 * -EAGAIN: An operation is already in progress. Retry later.
1748 * Errors that are real errors:
1749 * -EBADR: This unit type does not support starting.
1750 * -ECANCELED: Start limit hit, too many requests for now
1751 * -EPROTO: Assert failed
1752 * -EINVAL: Unit not loaded
1753 * -EOPNOTSUPP: Unit type not supported
1754 * -ENOLINK: The necessary dependencies are not fulfilled.
1755 * -ESTALE: This unit has been started before and can't be started a second time
1756 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1758 int unit_start(Unit
*u
) {
1759 UnitActiveState state
;
1764 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1765 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1766 * waiting is finished. */
1767 state
= unit_active_state(u
);
1768 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1770 if (state
== UNIT_MAINTENANCE
)
1773 /* Units that aren't loaded cannot be started */
1774 if (u
->load_state
!= UNIT_LOADED
)
1777 /* Refuse starting scope units more than once */
1778 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1781 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1782 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1783 * recheck the condition in that case. */
1784 if (state
!= UNIT_ACTIVATING
&&
1785 !unit_test_condition(u
))
1786 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1788 /* If the asserts failed, fail the entire job */
1789 if (state
!= UNIT_ACTIVATING
&&
1790 !unit_test_assert(u
))
1791 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1793 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1794 * condition checks, so that we rather return condition check errors (which are usually not
1795 * considered a true failure) than "not supported" errors (which are considered a failure).
1797 if (!unit_type_supported(u
->type
))
1800 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1801 * should have taken care of this already, but let's check this here again. After all, our
1802 * dependencies might not be in effect anymore, due to a reload or due to a failed condition. */
1803 if (!unit_verify_deps(u
))
1806 /* Forward to the main object, if we aren't it. */
1807 following
= unit_following(u
);
1809 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1810 return unit_start(following
);
1813 /* If it is stopped, but we cannot start it, then fail */
1814 if (!UNIT_VTABLE(u
)->start
)
1817 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1818 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1819 * waits for a holdoff timer to elapse before it will start again. */
1821 unit_add_to_dbus_queue(u
);
1823 return UNIT_VTABLE(u
)->start(u
);
1826 bool unit_can_start(Unit
*u
) {
1829 if (u
->load_state
!= UNIT_LOADED
)
1832 if (!unit_type_supported(u
->type
))
1835 /* Scope units may be started only once */
1836 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1839 return !!UNIT_VTABLE(u
)->start
;
1842 bool unit_can_isolate(Unit
*u
) {
1845 return unit_can_start(u
) &&
1850 * -EBADR: This unit type does not support stopping.
1851 * -EALREADY: Unit is already stopped.
1852 * -EAGAIN: An operation is already in progress. Retry later.
1854 int unit_stop(Unit
*u
) {
1855 UnitActiveState state
;
1860 state
= unit_active_state(u
);
1861 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1864 following
= unit_following(u
);
1866 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1867 return unit_stop(following
);
1870 if (!UNIT_VTABLE(u
)->stop
)
1873 unit_add_to_dbus_queue(u
);
1875 return UNIT_VTABLE(u
)->stop(u
);
1878 bool unit_can_stop(Unit
*u
) {
1881 if (!unit_type_supported(u
->type
))
1887 return !!UNIT_VTABLE(u
)->stop
;
1891 * -EBADR: This unit type does not support reloading.
1892 * -ENOEXEC: Unit is not started.
1893 * -EAGAIN: An operation is already in progress. Retry later.
1895 int unit_reload(Unit
*u
) {
1896 UnitActiveState state
;
1901 if (u
->load_state
!= UNIT_LOADED
)
1904 if (!unit_can_reload(u
))
1907 state
= unit_active_state(u
);
1908 if (state
== UNIT_RELOADING
)
1911 if (state
!= UNIT_ACTIVE
) {
1912 log_unit_warning(u
, "Unit cannot be reloaded because it is inactive.");
1916 following
= unit_following(u
);
1918 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1919 return unit_reload(following
);
1922 unit_add_to_dbus_queue(u
);
1924 if (!UNIT_VTABLE(u
)->reload
) {
1925 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
1926 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
1930 return UNIT_VTABLE(u
)->reload(u
);
1933 bool unit_can_reload(Unit
*u
) {
1936 if (UNIT_VTABLE(u
)->can_reload
)
1937 return UNIT_VTABLE(u
)->can_reload(u
);
1939 if (!hashmap_isempty(u
->dependencies
[UNIT_PROPAGATES_RELOAD_TO
]))
1942 return UNIT_VTABLE(u
)->reload
;
1945 bool unit_is_unneeded(Unit
*u
) {
1946 static const UnitDependency deps
[] = {
1956 if (!u
->stop_when_unneeded
)
1959 /* Don't clean up while the unit is transitioning or is even inactive. */
1960 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
1965 for (j
= 0; j
< ELEMENTSOF(deps
); j
++) {
1970 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
1971 * restart, then don't clean this one up. */
1973 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[deps
[j
]], i
) {
1977 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1980 if (unit_will_restart(other
))
1988 static void check_unneeded_dependencies(Unit
*u
) {
1990 static const UnitDependency deps
[] = {
2000 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2002 for (j
= 0; j
< ELEMENTSOF(deps
); j
++) {
2007 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[deps
[j
]], i
)
2008 unit_submit_to_stop_when_unneeded_queue(other
);
2012 static void unit_check_binds_to(Unit
*u
) {
2013 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2025 if (unit_active_state(u
) != UNIT_ACTIVE
)
2028 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
) {
2032 if (!other
->coldplugged
)
2033 /* We might yet create a job for the other unit… */
2036 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2046 /* If stopping a unit fails continuously we might enter a stop
2047 * loop here, hence stop acting on the service being
2048 * unnecessary after a while. */
2049 if (!ratelimit_below(&u
->auto_stop_ratelimit
)) {
2050 log_unit_warning(u
, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other
->id
);
2055 log_unit_info(u
, "Unit is bound to inactive unit %s. Stopping, too.", other
->id
);
2057 /* A unit we need to run is gone. Sniff. Let's stop this. */
2058 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, NULL
, &error
, NULL
);
2060 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2063 static void retroactively_start_dependencies(Unit
*u
) {
2069 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2071 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], i
)
2072 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2073 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2074 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2076 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2077 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2078 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2079 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2081 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
], i
)
2082 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2083 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2084 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2086 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTS
], i
)
2087 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2088 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2090 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTED_BY
], i
)
2091 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2092 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2095 static void retroactively_stop_dependencies(Unit
*u
) {
2101 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2103 /* Pull down units which are bound to us recursively if enabled */
2104 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
2105 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2106 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2109 void unit_start_on_failure(Unit
*u
) {
2117 if (hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
2120 log_unit_info(u
, "Triggering OnFailure= dependencies.");
2122 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_ON_FAILURE
], i
) {
2123 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2125 r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_job_mode
, NULL
, &error
, NULL
);
2127 log_unit_warning_errno(u
, r
, "Failed to enqueue OnFailure= job, ignoring: %s", bus_error_message(&error
, r
));
2131 void unit_trigger_notify(Unit
*u
) {
2138 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_TRIGGERED_BY
], i
)
2139 if (UNIT_VTABLE(other
)->trigger_notify
)
2140 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2143 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2144 if (condition_notice
&& log_level
> LOG_NOTICE
)
2146 if (condition_info
&& log_level
> LOG_INFO
)
2151 static int unit_log_resources(Unit
*u
) {
2152 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2153 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2154 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2155 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a treshold */
2156 size_t n_message_parts
= 0, n_iovec
= 0;
2157 char* message_parts
[1 + 2 + 2 + 1], *t
;
2158 nsec_t nsec
= NSEC_INFINITY
;
2159 CGroupIPAccountingMetric m
;
2162 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2163 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2164 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2165 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2166 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2168 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2169 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2170 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2171 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2172 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2177 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2178 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2179 * information and the complete data in structured fields. */
2181 (void) unit_get_cpu_usage(u
, &nsec
);
2182 if (nsec
!= NSEC_INFINITY
) {
2183 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2185 /* Format the CPU time for inclusion in the structured log message */
2186 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2190 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2192 /* Format the CPU time for inclusion in the human language message string */
2193 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2194 t
= strjoin("consumed ", buf
, " CPU time");
2200 message_parts
[n_message_parts
++] = t
;
2202 log_level
= raise_level(log_level
,
2203 nsec
> NOTICEWORTHY_CPU_NSEC
,
2204 nsec
> MENTIONWORTHY_CPU_NSEC
);
2207 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2208 char buf
[FORMAT_BYTES_MAX
] = "";
2209 uint64_t value
= UINT64_MAX
;
2211 assert(io_fields
[k
]);
2213 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2214 if (value
== UINT64_MAX
)
2217 have_io_accounting
= true;
2221 /* Format IO accounting data for inclusion in the structured log message */
2222 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2226 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2228 /* Format the IO accounting data for inclusion in the human language message string, but only
2229 * for the bytes counters (and not for the operations counters) */
2230 if (k
== CGROUP_IO_READ_BYTES
) {
2232 rr
= strjoin("read ", format_bytes(buf
, sizeof(buf
), value
), " from disk");
2237 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2239 wr
= strjoin("written ", format_bytes(buf
, sizeof(buf
), value
), " to disk");
2246 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2247 log_level
= raise_level(log_level
,
2248 value
> MENTIONWORTHY_IO_BYTES
,
2249 value
> NOTICEWORTHY_IO_BYTES
);
2252 if (have_io_accounting
) {
2255 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2257 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2262 k
= strdup("no IO");
2268 message_parts
[n_message_parts
++] = k
;
2272 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2273 char buf
[FORMAT_BYTES_MAX
] = "";
2274 uint64_t value
= UINT64_MAX
;
2276 assert(ip_fields
[m
]);
2278 (void) unit_get_ip_accounting(u
, m
, &value
);
2279 if (value
== UINT64_MAX
)
2282 have_ip_accounting
= true;
2286 /* Format IP accounting data for inclusion in the structured log message */
2287 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2291 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2293 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2294 * bytes counters (and not for the packets counters) */
2295 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2297 igress
= strjoin("received ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2302 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2304 egress
= strjoin("sent ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2311 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2312 log_level
= raise_level(log_level
,
2313 value
> MENTIONWORTHY_IP_BYTES
,
2314 value
> NOTICEWORTHY_IP_BYTES
);
2317 if (have_ip_accounting
) {
2320 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2322 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2327 k
= strdup("no IP traffic");
2333 message_parts
[n_message_parts
++] = k
;
2337 /* Is there any accounting data available at all? */
2343 if (n_message_parts
== 0)
2344 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2346 _cleanup_free_
char *joined
;
2348 message_parts
[n_message_parts
] = NULL
;
2350 joined
= strv_join(message_parts
, ", ");
2356 joined
[0] = ascii_toupper(joined
[0]);
2357 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2360 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2361 * and hence don't increase n_iovec for them */
2362 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2363 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2365 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2366 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2368 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2369 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2371 log_struct_iovec(log_level
, iovec
, n_iovec
+ 4);
2375 for (i
= 0; i
< n_message_parts
; i
++)
2376 free(message_parts
[i
]);
2378 for (i
= 0; i
< n_iovec
; i
++)
2379 free(iovec
[i
].iov_base
);
2385 static void unit_update_on_console(Unit
*u
) {
2390 b
= unit_needs_console(u
);
2391 if (u
->on_console
== b
)
2396 manager_ref_console(u
->manager
);
2398 manager_unref_console(u
->manager
);
2401 static void unit_emit_audit_start(Unit
*u
) {
2404 if (u
->type
!= UNIT_SERVICE
)
2407 /* Write audit record if we have just finished starting up */
2408 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2412 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2415 if (u
->type
!= UNIT_SERVICE
)
2419 /* Write audit record if we have just finished shutting down */
2420 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2421 u
->in_audit
= false;
2423 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2424 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2426 if (state
== UNIT_INACTIVE
)
2427 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2431 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2432 bool unexpected
= false;
2437 if (j
->state
== JOB_WAITING
)
2439 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2441 job_add_to_run_queue(j
);
2443 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2444 * hence needs to invalidate jobs. */
2449 case JOB_VERIFY_ACTIVE
:
2451 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2452 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2453 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2456 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2457 if (ns
== UNIT_FAILED
)
2458 result
= JOB_FAILED
;
2459 else if (FLAGS_SET(flags
, UNIT_NOTIFY_SKIP_CONDITION
))
2460 result
= JOB_SKIPPED
;
2464 job_finish_and_invalidate(j
, result
, true, false);
2471 case JOB_RELOAD_OR_START
:
2472 case JOB_TRY_RELOAD
:
2474 if (j
->state
== JOB_RUNNING
) {
2475 if (ns
== UNIT_ACTIVE
)
2476 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2477 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2480 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2481 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2489 case JOB_TRY_RESTART
:
2491 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2492 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2493 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2495 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2501 assert_not_reached("Job type unknown");
2507 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2512 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2513 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2515 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2516 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2517 * remounted this function will be called too! */
2521 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2522 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2523 unit_add_to_dbus_queue(u
);
2525 /* Update timestamps for state changes */
2526 if (!MANAGER_IS_RELOADING(m
)) {
2527 dual_timestamp_get(&u
->state_change_timestamp
);
2529 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2530 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2531 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2532 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2534 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2535 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2536 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2537 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2540 /* Keep track of failed units */
2541 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2543 /* Make sure the cgroup and state files are always removed when we become inactive */
2544 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2545 unit_prune_cgroup(u
);
2546 unit_unlink_state_files(u
);
2549 unit_update_on_console(u
);
2551 if (!MANAGER_IS_RELOADING(m
)) {
2554 /* Let's propagate state changes to the job */
2556 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2560 /* If this state change happened without being requested by a job, then let's retroactively start or
2561 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2562 * additional jobs just because something is already activated. */
2565 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2566 retroactively_start_dependencies(u
);
2567 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2568 retroactively_stop_dependencies(u
);
2571 /* stop unneeded units regardless if going down was expected or not */
2572 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2573 check_unneeded_dependencies(u
);
2575 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2576 log_unit_debug(u
, "Unit entered failed state.");
2578 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2579 unit_start_on_failure(u
);
2582 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2583 /* This unit just finished starting up */
2585 unit_emit_audit_start(u
);
2586 manager_send_unit_plymouth(m
, u
);
2589 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2590 /* This unit just stopped/failed. */
2592 unit_emit_audit_stop(u
, ns
);
2593 unit_log_resources(u
);
2597 manager_recheck_journal(m
);
2598 manager_recheck_dbus(m
);
2600 unit_trigger_notify(u
);
2602 if (!MANAGER_IS_RELOADING(m
)) {
2603 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2604 unit_submit_to_stop_when_unneeded_queue(u
);
2606 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens when
2607 * something BindsTo= to a Type=oneshot unit, as these units go directly from starting to inactive,
2608 * without ever entering started.) */
2609 unit_check_binds_to(u
);
2611 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2612 reason
= strjoina("unit ", u
->id
, " failed");
2613 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2614 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2615 reason
= strjoina("unit ", u
->id
, " succeeded");
2616 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2620 unit_add_to_gc_queue(u
);
2623 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2627 assert(pid_is_valid(pid
));
2629 /* Watch a specific PID */
2631 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2632 * opportunity to remove any stalled references to this PID as they can be created
2633 * easily (when watching a process which is not our direct child). */
2635 manager_unwatch_pid(u
->manager
, pid
);
2637 r
= set_ensure_allocated(&u
->pids
, NULL
);
2641 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2645 /* First try, let's add the unit keyed by "pid". */
2646 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2652 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2653 * to an array of Units rather than just a Unit), lists us already. */
2655 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2657 for (; array
[n
]; n
++)
2661 if (found
) /* Found it already? if so, do nothing */
2666 /* Allocate a new array */
2667 new_array
= new(Unit
*, n
+ 2);
2671 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2673 new_array
[n
+1] = NULL
;
2675 /* Add or replace the old array */
2676 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2687 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2694 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2698 assert(pid_is_valid(pid
));
2700 /* First let's drop the unit in case it's keyed as "pid". */
2701 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2703 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2704 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2708 /* Let's iterate through the array, dropping our own entry */
2709 for (n
= 0; array
[n
]; n
++)
2711 array
[m
++] = array
[n
];
2715 /* The array is now empty, remove the entire entry */
2716 assert(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2721 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2724 void unit_unwatch_all_pids(Unit
*u
) {
2727 while (!set_isempty(u
->pids
))
2728 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2730 u
->pids
= set_free(u
->pids
);
2733 static void unit_tidy_watch_pids(Unit
*u
) {
2734 pid_t except1
, except2
;
2740 /* Cleans dead PIDs from our list */
2742 except1
= unit_main_pid(u
);
2743 except2
= unit_control_pid(u
);
2745 SET_FOREACH(e
, u
->pids
, i
) {
2746 pid_t pid
= PTR_TO_PID(e
);
2748 if (pid
== except1
|| pid
== except2
)
2751 if (!pid_is_unwaited(pid
))
2752 unit_unwatch_pid(u
, pid
);
2756 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2762 unit_tidy_watch_pids(u
);
2763 unit_watch_all_pids(u
);
2765 /* If the PID set is empty now, then let's finish this off. */
2766 unit_synthesize_cgroup_empty_event(u
);
2771 int unit_enqueue_rewatch_pids(Unit
*u
) {
2776 if (!u
->cgroup_path
)
2779 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2782 if (r
> 0) /* On unified we can use proper notifications */
2785 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2786 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2787 * involves issuing kill(pid, 0) on all processes we watch. */
2789 if (!u
->rewatch_pids_event_source
) {
2790 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2792 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2794 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2796 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2798 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2800 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2802 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2805 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2807 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2812 void unit_dequeue_rewatch_pids(Unit
*u
) {
2816 if (!u
->rewatch_pids_event_source
)
2819 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2821 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2823 u
->rewatch_pids_event_source
= sd_event_source_unref(u
->rewatch_pids_event_source
);
2826 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2828 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2832 case JOB_VERIFY_ACTIVE
:
2835 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2836 * startable by us but may appear due to external events, and it thus makes sense to permit enqueing
2841 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2842 * external events), hence it makes no sense to permit enqueing such a request either. */
2843 return !u
->perpetual
;
2846 case JOB_TRY_RESTART
:
2847 return unit_can_stop(u
) && unit_can_start(u
);
2850 case JOB_TRY_RELOAD
:
2851 return unit_can_reload(u
);
2853 case JOB_RELOAD_OR_START
:
2854 return unit_can_reload(u
) && unit_can_start(u
);
2857 assert_not_reached("Invalid job type");
2861 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
) {
2864 /* Only warn about some unit types */
2865 if (!IN_SET(dependency
, UNIT_CONFLICTS
, UNIT_CONFLICTED_BY
, UNIT_BEFORE
, UNIT_AFTER
, UNIT_ON_FAILURE
, UNIT_TRIGGERS
, UNIT_TRIGGERED_BY
))
2868 if (streq_ptr(u
->id
, other
))
2869 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
2871 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other
), u
->id
);
2874 static int unit_add_dependency_hashmap(
2877 UnitDependencyMask origin_mask
,
2878 UnitDependencyMask destination_mask
) {
2880 UnitDependencyInfo info
;
2885 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2886 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2887 assert(origin_mask
> 0 || destination_mask
> 0);
2889 r
= hashmap_ensure_allocated(h
, NULL
);
2893 assert_cc(sizeof(void*) == sizeof(info
));
2895 info
.data
= hashmap_get(*h
, other
);
2897 /* Entry already exists. Add in our mask. */
2899 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
2900 FLAGS_SET(destination_mask
, info
.destination_mask
))
2903 info
.origin_mask
|= origin_mask
;
2904 info
.destination_mask
|= destination_mask
;
2906 r
= hashmap_update(*h
, other
, info
.data
);
2908 info
= (UnitDependencyInfo
) {
2909 .origin_mask
= origin_mask
,
2910 .destination_mask
= destination_mask
,
2913 r
= hashmap_put(*h
, other
, info
.data
);
2921 int unit_add_dependency(
2926 UnitDependencyMask mask
) {
2928 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2929 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2930 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2931 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2932 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2933 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2934 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
2935 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
2936 [UNIT_WANTED_BY
] = UNIT_WANTS
,
2937 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
2938 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
2939 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
2940 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
2941 [UNIT_BEFORE
] = UNIT_AFTER
,
2942 [UNIT_AFTER
] = UNIT_BEFORE
,
2943 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
2944 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
2945 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
2946 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
2947 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
2948 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
2949 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
2950 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
,
2952 Unit
*original_u
= u
, *original_other
= other
;
2956 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
2959 u
= unit_follow_merge(u
);
2960 other
= unit_follow_merge(other
);
2962 /* We won't allow dependencies on ourselves. We will not
2963 * consider them an error however. */
2965 maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
2969 if (d
== UNIT_AFTER
&& UNIT_VTABLE(u
)->refuse_after
) {
2970 log_unit_warning(u
, "Requested dependency After=%s ignored (%s units cannot be delayed).", other
->id
, unit_type_to_string(u
->type
));
2974 if (d
== UNIT_BEFORE
&& UNIT_VTABLE(other
)->refuse_after
) {
2975 log_unit_warning(u
, "Requested dependency Before=%s ignored (%s units cannot be delayed).", other
->id
, unit_type_to_string(other
->type
));
2979 if (d
== UNIT_ON_FAILURE
&& !UNIT_VTABLE(u
)->can_fail
) {
2980 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
2984 if (d
== UNIT_TRIGGERS
&& !UNIT_VTABLE(u
)->can_trigger
)
2985 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
2986 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
2987 if (d
== UNIT_TRIGGERED_BY
&& !UNIT_VTABLE(other
)->can_trigger
)
2988 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
2989 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
2991 r
= unit_add_dependency_hashmap(u
->dependencies
+ d
, other
, mask
, 0);
2995 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
2996 r
= unit_add_dependency_hashmap(other
->dependencies
+ inverse_table
[d
], u
, 0, mask
);
3001 if (add_reference
) {
3002 r
= unit_add_dependency_hashmap(u
->dependencies
+ UNIT_REFERENCES
, other
, mask
, 0);
3006 r
= unit_add_dependency_hashmap(other
->dependencies
+ UNIT_REFERENCED_BY
, u
, 0, mask
);
3011 unit_add_to_dbus_queue(u
);
3015 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3020 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3024 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3027 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3035 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3042 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3044 _cleanup_free_
char *i
= NULL
;
3046 r
= unit_name_to_prefix(u
->id
, &i
);
3050 r
= unit_name_replace_instance(name
, i
, buf
);
3059 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3060 _cleanup_free_
char *buf
= NULL
;
3067 r
= resolve_template(u
, name
, &buf
, &name
);
3071 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3075 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3078 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3079 _cleanup_free_
char *buf
= NULL
;
3086 r
= resolve_template(u
, name
, &buf
, &name
);
3090 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3094 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3097 int set_unit_path(const char *p
) {
3098 /* This is mostly for debug purposes */
3099 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
3105 char *unit_dbus_path(Unit
*u
) {
3111 return unit_dbus_path_from_name(u
->id
);
3114 char *unit_dbus_path_invocation_id(Unit
*u
) {
3117 if (sd_id128_is_null(u
->invocation_id
))
3120 return unit_dbus_path_from_name(u
->invocation_id_string
);
3123 int unit_set_slice(Unit
*u
, Unit
*slice
) {
3127 /* Sets the unit slice if it has not been set before. Is extra
3128 * careful, to only allow this for units that actually have a
3129 * cgroup context. Also, we don't allow to set this for slices
3130 * (since the parent slice is derived from the name). Make
3131 * sure the unit we set is actually a slice. */
3133 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3136 if (u
->type
== UNIT_SLICE
)
3139 if (unit_active_state(u
) != UNIT_INACTIVE
)
3142 if (slice
->type
!= UNIT_SLICE
)
3145 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3146 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3149 if (UNIT_DEREF(u
->slice
) == slice
)
3152 /* Disallow slice changes if @u is already bound to cgroups */
3153 if (UNIT_ISSET(u
->slice
) && u
->cgroup_realized
)
3156 unit_ref_set(&u
->slice
, u
, slice
);
3160 int unit_set_default_slice(Unit
*u
) {
3161 const char *slice_name
;
3167 if (UNIT_ISSET(u
->slice
))
3171 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3173 /* Implicitly place all instantiated units in their
3174 * own per-template slice */
3176 r
= unit_name_to_prefix(u
->id
, &prefix
);
3180 /* The prefix is already escaped, but it might include
3181 * "-" which has a special meaning for slice units,
3182 * hence escape it here extra. */
3183 escaped
= unit_name_escape(prefix
);
3187 if (MANAGER_IS_SYSTEM(u
->manager
))
3188 slice_name
= strjoina("system-", escaped
, ".slice");
3190 slice_name
= strjoina(escaped
, ".slice");
3193 MANAGER_IS_SYSTEM(u
->manager
) && !unit_has_name(u
, SPECIAL_INIT_SCOPE
)
3194 ? SPECIAL_SYSTEM_SLICE
3195 : SPECIAL_ROOT_SLICE
;
3197 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3201 return unit_set_slice(u
, slice
);
3204 const char *unit_slice_name(Unit
*u
) {
3207 if (!UNIT_ISSET(u
->slice
))
3210 return UNIT_DEREF(u
->slice
)->id
;
3213 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3214 _cleanup_free_
char *t
= NULL
;
3221 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3224 if (unit_has_name(u
, t
))
3227 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3228 assert(r
< 0 || *_found
!= u
);
3232 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3233 const char *new_owner
;
3240 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3242 bus_log_parse_error(r
);
3246 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3247 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3252 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3253 const sd_bus_error
*e
;
3254 const char *new_owner
;
3261 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3263 e
= sd_bus_message_get_error(message
);
3265 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner"))
3266 log_unit_error(u
, "Unexpected error response from GetNameOwner(): %s", e
->message
);
3270 r
= sd_bus_message_read(message
, "s", &new_owner
);
3272 return bus_log_parse_error(r
);
3274 assert(!isempty(new_owner
));
3277 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3278 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3283 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3291 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3294 match
= strjoina("type='signal',"
3295 "sender='org.freedesktop.DBus',"
3296 "path='/org/freedesktop/DBus',"
3297 "interface='org.freedesktop.DBus',"
3298 "member='NameOwnerChanged',"
3299 "arg0='", name
, "'");
3301 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3305 r
= sd_bus_call_method_async(
3307 &u
->get_name_owner_slot
,
3308 "org.freedesktop.DBus",
3309 "/org/freedesktop/DBus",
3310 "org.freedesktop.DBus",
3312 get_name_owner_handler
,
3316 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3320 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3324 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3330 /* Watch a specific name on the bus. We only support one unit
3331 * watching each name for now. */
3333 if (u
->manager
->api_bus
) {
3334 /* If the bus is already available, install the match directly.
3335 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3336 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3338 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3341 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3343 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3344 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3345 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3351 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3355 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3356 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3357 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3360 bool unit_can_serialize(Unit
*u
) {
3363 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
3366 static int serialize_cgroup_mask(FILE *f
, const char *key
, CGroupMask mask
) {
3367 _cleanup_free_
char *s
= NULL
;
3376 r
= cg_mask_to_string(mask
, &s
);
3378 return log_error_errno(r
, "Failed to format cgroup mask: %m");
3380 return serialize_item(f
, key
, s
);
3383 static const char *const ip_accounting_metric_field
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
3384 [CGROUP_IP_INGRESS_BYTES
] = "ip-accounting-ingress-bytes",
3385 [CGROUP_IP_INGRESS_PACKETS
] = "ip-accounting-ingress-packets",
3386 [CGROUP_IP_EGRESS_BYTES
] = "ip-accounting-egress-bytes",
3387 [CGROUP_IP_EGRESS_PACKETS
] = "ip-accounting-egress-packets",
3390 static const char *const io_accounting_metric_field_base
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
3391 [CGROUP_IO_READ_BYTES
] = "io-accounting-read-bytes-base",
3392 [CGROUP_IO_WRITE_BYTES
] = "io-accounting-write-bytes-base",
3393 [CGROUP_IO_READ_OPERATIONS
] = "io-accounting-read-operations-base",
3394 [CGROUP_IO_WRITE_OPERATIONS
] = "io-accounting-write-operations-base",
3397 static const char *const io_accounting_metric_field_last
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
3398 [CGROUP_IO_READ_BYTES
] = "io-accounting-read-bytes-last",
3399 [CGROUP_IO_WRITE_BYTES
] = "io-accounting-write-bytes-last",
3400 [CGROUP_IO_READ_OPERATIONS
] = "io-accounting-read-operations-last",
3401 [CGROUP_IO_WRITE_OPERATIONS
] = "io-accounting-write-operations-last",
3404 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
, bool serialize_jobs
) {
3405 CGroupIPAccountingMetric m
;
3412 if (unit_can_serialize(u
)) {
3413 r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
);
3418 (void) serialize_dual_timestamp(f
, "state-change-timestamp", &u
->state_change_timestamp
);
3420 (void) serialize_dual_timestamp(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
3421 (void) serialize_dual_timestamp(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
3422 (void) serialize_dual_timestamp(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
3423 (void) serialize_dual_timestamp(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
3425 (void) serialize_dual_timestamp(f
, "condition-timestamp", &u
->condition_timestamp
);
3426 (void) serialize_dual_timestamp(f
, "assert-timestamp", &u
->assert_timestamp
);
3428 if (dual_timestamp_is_set(&u
->condition_timestamp
))
3429 (void) serialize_bool(f
, "condition-result", u
->condition_result
);
3431 if (dual_timestamp_is_set(&u
->assert_timestamp
))
3432 (void) serialize_bool(f
, "assert-result", u
->assert_result
);
3434 (void) serialize_bool(f
, "transient", u
->transient
);
3435 (void) serialize_bool(f
, "in-audit", u
->in_audit
);
3437 (void) serialize_bool(f
, "exported-invocation-id", u
->exported_invocation_id
);
3438 (void) serialize_bool(f
, "exported-log-level-max", u
->exported_log_level_max
);
3439 (void) serialize_bool(f
, "exported-log-extra-fields", u
->exported_log_extra_fields
);
3440 (void) serialize_bool(f
, "exported-log-rate-limit-interval", u
->exported_log_ratelimit_interval
);
3441 (void) serialize_bool(f
, "exported-log-rate-limit-burst", u
->exported_log_ratelimit_burst
);
3443 (void) serialize_item_format(f
, "cpu-usage-base", "%" PRIu64
, u
->cpu_usage_base
);
3444 if (u
->cpu_usage_last
!= NSEC_INFINITY
)
3445 (void) serialize_item_format(f
, "cpu-usage-last", "%" PRIu64
, u
->cpu_usage_last
);
3447 if (u
->oom_kill_last
> 0)
3448 (void) serialize_item_format(f
, "oom-kill-last", "%" PRIu64
, u
->oom_kill_last
);
3450 for (CGroupIOAccountingMetric im
= 0; im
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; im
++) {
3451 (void) serialize_item_format(f
, io_accounting_metric_field_base
[im
], "%" PRIu64
, u
->io_accounting_base
[im
]);
3453 if (u
->io_accounting_last
[im
] != UINT64_MAX
)
3454 (void) serialize_item_format(f
, io_accounting_metric_field_last
[im
], "%" PRIu64
, u
->io_accounting_last
[im
]);
3458 (void) serialize_item(f
, "cgroup", u
->cgroup_path
);
3460 (void) serialize_bool(f
, "cgroup-realized", u
->cgroup_realized
);
3461 (void) serialize_cgroup_mask(f
, "cgroup-realized-mask", u
->cgroup_realized_mask
);
3462 (void) serialize_cgroup_mask(f
, "cgroup-enabled-mask", u
->cgroup_enabled_mask
);
3463 (void) serialize_cgroup_mask(f
, "cgroup-invalidated-mask", u
->cgroup_invalidated_mask
);
3465 if (uid_is_valid(u
->ref_uid
))
3466 (void) serialize_item_format(f
, "ref-uid", UID_FMT
, u
->ref_uid
);
3467 if (gid_is_valid(u
->ref_gid
))
3468 (void) serialize_item_format(f
, "ref-gid", GID_FMT
, u
->ref_gid
);
3470 if (!sd_id128_is_null(u
->invocation_id
))
3471 (void) serialize_item_format(f
, "invocation-id", SD_ID128_FORMAT_STR
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
3473 bus_track_serialize(u
->bus_track
, f
, "ref");
3475 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
3478 r
= unit_get_ip_accounting(u
, m
, &v
);
3480 (void) serialize_item_format(f
, ip_accounting_metric_field
[m
], "%" PRIu64
, v
);
3483 if (serialize_jobs
) {
3486 job_serialize(u
->job
, f
);
3491 job_serialize(u
->nop_job
, f
);
3500 static int unit_deserialize_job(Unit
*u
, FILE *f
) {
3501 _cleanup_(job_freep
) Job
*j
= NULL
;
3511 r
= job_deserialize(j
, f
);
3515 r
= job_install_deserialized(j
);
3523 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
3531 _cleanup_free_
char *line
= NULL
;
3536 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3538 return log_error_errno(r
, "Failed to read serialization line: %m");
3539 if (r
== 0) /* eof */
3543 if (isempty(l
)) /* End marker */
3546 k
= strcspn(l
, "=");
3554 if (streq(l
, "job")) {
3556 /* New-style serialized job */
3557 r
= unit_deserialize_job(u
, f
);
3560 } else /* Legacy for pre-44 */
3561 log_unit_warning(u
, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v
);
3563 } else if (streq(l
, "state-change-timestamp")) {
3564 (void) deserialize_dual_timestamp(v
, &u
->state_change_timestamp
);
3566 } else if (streq(l
, "inactive-exit-timestamp")) {
3567 (void) deserialize_dual_timestamp(v
, &u
->inactive_exit_timestamp
);
3569 } else if (streq(l
, "active-enter-timestamp")) {
3570 (void) deserialize_dual_timestamp(v
, &u
->active_enter_timestamp
);
3572 } else if (streq(l
, "active-exit-timestamp")) {
3573 (void) deserialize_dual_timestamp(v
, &u
->active_exit_timestamp
);
3575 } else if (streq(l
, "inactive-enter-timestamp")) {
3576 (void) deserialize_dual_timestamp(v
, &u
->inactive_enter_timestamp
);
3578 } else if (streq(l
, "condition-timestamp")) {
3579 (void) deserialize_dual_timestamp(v
, &u
->condition_timestamp
);
3581 } else if (streq(l
, "assert-timestamp")) {
3582 (void) deserialize_dual_timestamp(v
, &u
->assert_timestamp
);
3584 } else if (streq(l
, "condition-result")) {
3586 r
= parse_boolean(v
);
3588 log_unit_debug(u
, "Failed to parse condition result value %s, ignoring.", v
);
3590 u
->condition_result
= r
;
3594 } else if (streq(l
, "assert-result")) {
3596 r
= parse_boolean(v
);
3598 log_unit_debug(u
, "Failed to parse assert result value %s, ignoring.", v
);
3600 u
->assert_result
= r
;
3604 } else if (streq(l
, "transient")) {
3606 r
= parse_boolean(v
);
3608 log_unit_debug(u
, "Failed to parse transient bool %s, ignoring.", v
);
3614 } else if (streq(l
, "in-audit")) {
3616 r
= parse_boolean(v
);
3618 log_unit_debug(u
, "Failed to parse in-audit bool %s, ignoring.", v
);
3624 } else if (streq(l
, "exported-invocation-id")) {
3626 r
= parse_boolean(v
);
3628 log_unit_debug(u
, "Failed to parse exported invocation ID bool %s, ignoring.", v
);
3630 u
->exported_invocation_id
= r
;
3634 } else if (streq(l
, "exported-log-level-max")) {
3636 r
= parse_boolean(v
);
3638 log_unit_debug(u
, "Failed to parse exported log level max bool %s, ignoring.", v
);
3640 u
->exported_log_level_max
= r
;
3644 } else if (streq(l
, "exported-log-extra-fields")) {
3646 r
= parse_boolean(v
);
3648 log_unit_debug(u
, "Failed to parse exported log extra fields bool %s, ignoring.", v
);
3650 u
->exported_log_extra_fields
= r
;
3654 } else if (streq(l
, "exported-log-rate-limit-interval")) {
3656 r
= parse_boolean(v
);
3658 log_unit_debug(u
, "Failed to parse exported log rate limit interval %s, ignoring.", v
);
3660 u
->exported_log_ratelimit_interval
= r
;
3664 } else if (streq(l
, "exported-log-rate-limit-burst")) {
3666 r
= parse_boolean(v
);
3668 log_unit_debug(u
, "Failed to parse exported log rate limit burst %s, ignoring.", v
);
3670 u
->exported_log_ratelimit_burst
= r
;
3674 } else if (STR_IN_SET(l
, "cpu-usage-base", "cpuacct-usage-base")) {
3676 r
= safe_atou64(v
, &u
->cpu_usage_base
);
3678 log_unit_debug(u
, "Failed to parse CPU usage base %s, ignoring.", v
);
3682 } else if (streq(l
, "cpu-usage-last")) {
3684 r
= safe_atou64(v
, &u
->cpu_usage_last
);
3686 log_unit_debug(u
, "Failed to read CPU usage last %s, ignoring.", v
);
3690 } else if (streq(l
, "oom-kill-last")) {
3692 r
= safe_atou64(v
, &u
->oom_kill_last
);
3694 log_unit_debug(u
, "Failed to read OOM kill last %s, ignoring.", v
);
3698 } else if (streq(l
, "cgroup")) {
3700 r
= unit_set_cgroup_path(u
, v
);
3702 log_unit_debug_errno(u
, r
, "Failed to set cgroup path %s, ignoring: %m", v
);
3704 (void) unit_watch_cgroup(u
);
3705 (void) unit_watch_cgroup_memory(u
);
3708 } else if (streq(l
, "cgroup-realized")) {
3711 b
= parse_boolean(v
);
3713 log_unit_debug(u
, "Failed to parse cgroup-realized bool %s, ignoring.", v
);
3715 u
->cgroup_realized
= b
;
3719 } else if (streq(l
, "cgroup-realized-mask")) {
3721 r
= cg_mask_from_string(v
, &u
->cgroup_realized_mask
);
3723 log_unit_debug(u
, "Failed to parse cgroup-realized-mask %s, ignoring.", v
);
3726 } else if (streq(l
, "cgroup-enabled-mask")) {
3728 r
= cg_mask_from_string(v
, &u
->cgroup_enabled_mask
);
3730 log_unit_debug(u
, "Failed to parse cgroup-enabled-mask %s, ignoring.", v
);
3733 } else if (streq(l
, "cgroup-invalidated-mask")) {
3735 r
= cg_mask_from_string(v
, &u
->cgroup_invalidated_mask
);
3737 log_unit_debug(u
, "Failed to parse cgroup-invalidated-mask %s, ignoring.", v
);
3740 } else if (streq(l
, "ref-uid")) {
3743 r
= parse_uid(v
, &uid
);
3745 log_unit_debug(u
, "Failed to parse referenced UID %s, ignoring.", v
);
3747 unit_ref_uid_gid(u
, uid
, GID_INVALID
);
3751 } else if (streq(l
, "ref-gid")) {
3754 r
= parse_gid(v
, &gid
);
3756 log_unit_debug(u
, "Failed to parse referenced GID %s, ignoring.", v
);
3758 unit_ref_uid_gid(u
, UID_INVALID
, gid
);
3762 } else if (streq(l
, "ref")) {
3764 r
= strv_extend(&u
->deserialized_refs
, v
);
3769 } else if (streq(l
, "invocation-id")) {
3772 r
= sd_id128_from_string(v
, &id
);
3774 log_unit_debug(u
, "Failed to parse invocation id %s, ignoring.", v
);
3776 r
= unit_set_invocation_id(u
, id
);
3778 log_unit_warning_errno(u
, r
, "Failed to set invocation ID for unit: %m");
3784 /* Check if this is an IP accounting metric serialization field */
3785 m
= string_table_lookup(ip_accounting_metric_field
, ELEMENTSOF(ip_accounting_metric_field
), l
);
3789 r
= safe_atou64(v
, &c
);
3791 log_unit_debug(u
, "Failed to parse IP accounting value %s, ignoring.", v
);
3793 u
->ip_accounting_extra
[m
] = c
;
3797 m
= string_table_lookup(io_accounting_metric_field_base
, ELEMENTSOF(io_accounting_metric_field_base
), l
);
3801 r
= safe_atou64(v
, &c
);
3803 log_unit_debug(u
, "Failed to parse IO accounting base value %s, ignoring.", v
);
3805 u
->io_accounting_base
[m
] = c
;
3809 m
= string_table_lookup(io_accounting_metric_field_last
, ELEMENTSOF(io_accounting_metric_field_last
), l
);
3813 r
= safe_atou64(v
, &c
);
3815 log_unit_debug(u
, "Failed to parse IO accounting last value %s, ignoring.", v
);
3817 u
->io_accounting_last
[m
] = c
;
3821 if (unit_can_serialize(u
)) {
3822 r
= exec_runtime_deserialize_compat(u
, l
, v
, fds
);
3824 log_unit_warning(u
, "Failed to deserialize runtime parameter '%s', ignoring.", l
);
3828 /* Returns positive if key was handled by the call */
3832 r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
);
3834 log_unit_warning(u
, "Failed to deserialize unit parameter '%s', ignoring.", l
);
3838 /* Versions before 228 did not carry a state change timestamp. In this case, take the current time. This is
3839 * useful, so that timeouts based on this timestamp don't trigger too early, and is in-line with the logic from
3840 * before 228 where the base for timeouts was not persistent across reboots. */
3842 if (!dual_timestamp_is_set(&u
->state_change_timestamp
))
3843 dual_timestamp_get(&u
->state_change_timestamp
);
3845 /* Let's make sure that everything that is deserialized also gets any potential new cgroup settings applied
3846 * after we are done. For that we invalidate anything already realized, so that we can realize it again. */
3847 unit_invalidate_cgroup(u
, _CGROUP_MASK_ALL
);
3848 unit_invalidate_cgroup_bpf(u
);
3853 int unit_deserialize_skip(FILE *f
) {
3857 /* Skip serialized data for this unit. We don't know what it is. */
3860 _cleanup_free_
char *line
= NULL
;
3863 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3865 return log_error_errno(r
, "Failed to read serialization line: %m");
3877 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3878 _cleanup_free_
char *e
= NULL
;
3884 /* Adds in links to the device node that this unit is based on */
3888 if (!is_device_path(what
))
3891 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3892 if (!unit_type_supported(UNIT_DEVICE
))
3895 r
= unit_name_from_path(what
, ".device", &e
);
3899 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3903 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3904 dep
= UNIT_BINDS_TO
;
3906 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3907 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3908 device
, true, mask
);
3911 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3912 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3920 if (!path_startswith(what
, "/dev/"))
3923 /* If we don't support devices, then also don't bother with blockdev@.target */
3924 if (!unit_type_supported(UNIT_DEVICE
))
3927 r
= unit_name_path_escape(what
, &escaped
);
3931 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3935 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3938 int unit_coldplug(Unit
*u
) {
3945 /* Make sure we don't enter a loop, when coldplugging recursively. */
3949 u
->coldplugged
= true;
3951 STRV_FOREACH(i
, u
->deserialized_refs
) {
3952 q
= bus_unit_track_add_name(u
, *i
);
3953 if (q
< 0 && r
>= 0)
3956 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3958 if (UNIT_VTABLE(u
)->coldplug
) {
3959 q
= UNIT_VTABLE(u
)->coldplug(u
);
3960 if (q
< 0 && r
>= 0)
3964 uj
= u
->job
?: u
->nop_job
;
3966 q
= job_coldplug(uj
);
3967 if (q
< 0 && r
>= 0)
3974 void unit_catchup(Unit
*u
) {
3977 if (UNIT_VTABLE(u
)->catchup
)
3978 UNIT_VTABLE(u
)->catchup(u
);
3981 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3987 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3988 * are never out-of-date. */
3989 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3992 if (stat(path
, &st
) < 0)
3993 /* What, cannot access this anymore? */
3997 /* For masked files check if they are still so */
3998 return !null_or_empty(&st
);
4000 /* For non-empty files check the mtime */
4001 return timespec_load(&st
.st_mtim
) > mtime
;
4006 bool unit_need_daemon_reload(Unit
*u
) {
4007 _cleanup_strv_free_
char **t
= NULL
;
4012 /* For unit files, we allow masking… */
4013 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
4014 u
->load_state
== UNIT_MASKED
))
4017 /* Source paths should not be masked… */
4018 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
4021 if (u
->load_state
== UNIT_LOADED
)
4022 (void) unit_find_dropin_paths(u
, &t
);
4023 if (!strv_equal(u
->dropin_paths
, t
))
4026 /* … any drop-ins that are masked are simply omitted from the list. */
4027 STRV_FOREACH(path
, u
->dropin_paths
)
4028 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
4034 void unit_reset_failed(Unit
*u
) {
4037 if (UNIT_VTABLE(u
)->reset_failed
)
4038 UNIT_VTABLE(u
)->reset_failed(u
);
4040 ratelimit_reset(&u
->start_ratelimit
);
4041 u
->start_limit_hit
= false;
4044 Unit
*unit_following(Unit
*u
) {
4047 if (UNIT_VTABLE(u
)->following
)
4048 return UNIT_VTABLE(u
)->following(u
);
4053 bool unit_stop_pending(Unit
*u
) {
4056 /* This call does check the current state of the unit. It's
4057 * hence useful to be called from state change calls of the
4058 * unit itself, where the state isn't updated yet. This is
4059 * different from unit_inactive_or_pending() which checks both
4060 * the current state and for a queued job. */
4062 return unit_has_job_type(u
, JOB_STOP
);
4065 bool unit_inactive_or_pending(Unit
*u
) {
4068 /* Returns true if the unit is inactive or going down */
4070 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
4073 if (unit_stop_pending(u
))
4079 bool unit_active_or_pending(Unit
*u
) {
4082 /* Returns true if the unit is active or going up */
4084 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
4088 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
4094 bool unit_will_restart_default(Unit
*u
) {
4097 return unit_has_job_type(u
, JOB_START
);
4100 bool unit_will_restart(Unit
*u
) {
4103 if (!UNIT_VTABLE(u
)->will_restart
)
4106 return UNIT_VTABLE(u
)->will_restart(u
);
4109 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
4111 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
4112 assert(SIGNAL_VALID(signo
));
4114 if (!UNIT_VTABLE(u
)->kill
)
4117 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
4120 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
4121 _cleanup_set_free_ Set
*pid_set
= NULL
;
4124 pid_set
= set_new(NULL
);
4128 /* Exclude the main/control pids from being killed via the cgroup */
4130 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
4135 if (control_pid
> 0) {
4136 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
4141 return TAKE_PTR(pid_set
);
4144 int unit_kill_common(
4150 sd_bus_error
*error
) {
4153 bool killed
= false;
4155 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
4157 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
4158 else if (main_pid
== 0)
4159 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
4162 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
4163 if (control_pid
< 0)
4164 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
4165 else if (control_pid
== 0)
4166 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
4169 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
4170 if (control_pid
> 0) {
4171 if (kill(control_pid
, signo
) < 0)
4177 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
4179 if (kill(main_pid
, signo
) < 0)
4185 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
4186 _cleanup_set_free_ Set
*pid_set
= NULL
;
4189 /* Exclude the main/control pids from being killed via the cgroup */
4190 pid_set
= unit_pid_set(main_pid
, control_pid
);
4194 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, NULL
, NULL
);
4195 if (q
< 0 && !IN_SET(q
, -EAGAIN
, -ESRCH
, -ENOENT
))
4201 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
))
4207 int unit_following_set(Unit
*u
, Set
**s
) {
4211 if (UNIT_VTABLE(u
)->following_set
)
4212 return UNIT_VTABLE(u
)->following_set(u
, s
);
4218 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
4223 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
4224 r
= unit_file_get_state(
4225 u
->manager
->unit_file_scope
,
4228 &u
->unit_file_state
);
4230 u
->unit_file_state
= UNIT_FILE_BAD
;
4233 return u
->unit_file_state
;
4236 int unit_get_unit_file_preset(Unit
*u
) {
4239 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
4240 u
->unit_file_preset
= unit_file_query_preset(
4241 u
->manager
->unit_file_scope
,
4243 basename(u
->fragment_path
));
4245 return u
->unit_file_preset
;
4248 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
4254 unit_ref_unset(ref
);
4256 ref
->source
= source
;
4257 ref
->target
= target
;
4258 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4262 void unit_ref_unset(UnitRef
*ref
) {
4268 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4269 * be unreferenced now. */
4270 unit_add_to_gc_queue(ref
->target
);
4272 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4273 ref
->source
= ref
->target
= NULL
;
4276 static int user_from_unit_name(Unit
*u
, char **ret
) {
4278 static const uint8_t hash_key
[] = {
4279 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4280 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4283 _cleanup_free_
char *n
= NULL
;
4286 r
= unit_name_to_prefix(u
->id
, &n
);
4290 if (valid_user_group_name(n
, 0)) {
4295 /* If we can't use the unit name as a user name, then let's hash it and use that */
4296 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4302 int unit_patch_contexts(Unit
*u
) {
4310 /* Patch in the manager defaults into the exec and cgroup
4311 * contexts, _after_ the rest of the settings have been
4314 ec
= unit_get_exec_context(u
);
4316 /* This only copies in the ones that need memory */
4317 for (i
= 0; i
< _RLIMIT_MAX
; i
++)
4318 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4319 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4324 if (MANAGER_IS_USER(u
->manager
) &&
4325 !ec
->working_directory
) {
4327 r
= get_home_dir(&ec
->working_directory
);
4331 /* Allow user services to run, even if the
4332 * home directory is missing */
4333 ec
->working_directory_missing_ok
= true;
4336 if (ec
->private_devices
)
4337 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4339 if (ec
->protect_kernel_modules
)
4340 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4342 if (ec
->protect_kernel_logs
)
4343 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4345 if (ec
->protect_clock
)
4346 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4348 if (ec
->dynamic_user
) {
4350 r
= user_from_unit_name(u
, &ec
->user
);
4356 ec
->group
= strdup(ec
->user
);
4361 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4362 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4365 ec
->private_tmp
= true;
4366 ec
->remove_ipc
= true;
4367 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4368 if (ec
->protect_home
== PROTECT_HOME_NO
)
4369 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4371 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4373 ec
->no_new_privileges
= true;
4374 ec
->restrict_suid_sgid
= true;
4378 cc
= unit_get_cgroup_context(u
);
4381 if (ec
->private_devices
&&
4382 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4383 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4385 if (ec
->root_image
&&
4386 (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
)) {
4388 /* When RootImage= is specified, the following devices are touched. */
4389 r
= cgroup_add_device_allow(cc
, "/dev/loop-control", "rw");
4393 r
= cgroup_add_device_allow(cc
, "block-loop", "rwm");
4397 r
= cgroup_add_device_allow(cc
, "block-blkext", "rwm");
4401 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices */
4402 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "modprobe@loop.service", true, UNIT_DEPENDENCY_FILE
);
4407 if (ec
->protect_clock
) {
4408 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4417 ExecContext
*unit_get_exec_context(Unit
*u
) {
4424 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4428 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4431 KillContext
*unit_get_kill_context(Unit
*u
) {
4438 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4442 return (KillContext
*) ((uint8_t*) u
+ offset
);
4445 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4451 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4455 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4458 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4464 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4468 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4471 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4474 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4477 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4478 return u
->manager
->lookup_paths
.transient
;
4480 if (flags
& UNIT_PERSISTENT
)
4481 return u
->manager
->lookup_paths
.persistent_control
;
4483 if (flags
& UNIT_RUNTIME
)
4484 return u
->manager
->lookup_paths
.runtime_control
;
4489 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4495 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4496 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4497 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4498 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4499 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4502 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4503 ret
= specifier_escape(s
);
4510 if (flags
& UNIT_ESCAPE_C
) {
4523 return ret
?: (char*) s
;
4526 return ret
?: strdup(s
);
4529 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4530 _cleanup_free_
char *result
= NULL
;
4531 size_t n
= 0, allocated
= 0;
4534 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4535 * way suitable for ExecStart= stanzas */
4537 STRV_FOREACH(i
, l
) {
4538 _cleanup_free_
char *buf
= NULL
;
4543 p
= unit_escape_setting(*i
, flags
, &buf
);
4547 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4548 if (!GREEDY_REALLOC(result
, allocated
, n
+ a
+ 1))
4562 if (!GREEDY_REALLOC(result
, allocated
, n
+ 1))
4567 return TAKE_PTR(result
);
4570 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4571 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4572 const char *dir
, *wrapped
;
4579 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4582 data
= unit_escape_setting(data
, flags
, &escaped
);
4586 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4587 * previous section header is the same */
4589 if (flags
& UNIT_PRIVATE
) {
4590 if (!UNIT_VTABLE(u
)->private_section
)
4593 if (!u
->transient_file
|| u
->last_section_private
< 0)
4594 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4595 else if (u
->last_section_private
== 0)
4596 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4598 if (!u
->transient_file
|| u
->last_section_private
< 0)
4599 data
= strjoina("[Unit]\n", data
);
4600 else if (u
->last_section_private
> 0)
4601 data
= strjoina("\n[Unit]\n", data
);
4604 if (u
->transient_file
) {
4605 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4606 * write to the transient unit file. */
4607 fputs(data
, u
->transient_file
);
4609 if (!endswith(data
, "\n"))
4610 fputc('\n', u
->transient_file
);
4612 /* Remember which section we wrote this entry to */
4613 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4617 dir
= unit_drop_in_dir(u
, flags
);
4621 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4622 "# or an equivalent operation. Do not edit.\n",
4626 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4630 (void) mkdir_p_label(p
, 0755);
4632 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4633 * recreate the cache after every drop-in we write. */
4634 if (u
->manager
->unit_path_cache
) {
4635 r
= set_put_strdup(u
->manager
->unit_path_cache
, p
);
4640 r
= write_string_file_atomic_label(q
, wrapped
);
4644 r
= strv_push(&u
->dropin_paths
, q
);
4649 strv_uniq(u
->dropin_paths
);
4651 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4656 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4657 _cleanup_free_
char *p
= NULL
;
4665 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4668 va_start(ap
, format
);
4669 r
= vasprintf(&p
, format
, ap
);
4675 return unit_write_setting(u
, flags
, name
, p
);
4678 int unit_make_transient(Unit
*u
) {
4679 _cleanup_free_
char *path
= NULL
;
4684 if (!UNIT_VTABLE(u
)->can_transient
)
4687 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4689 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4693 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4694 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4696 RUN_WITH_UMASK(0022) {
4697 f
= fopen(path
, "we");
4702 safe_fclose(u
->transient_file
);
4703 u
->transient_file
= f
;
4705 free_and_replace(u
->fragment_path
, path
);
4707 u
->source_path
= mfree(u
->source_path
);
4708 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4709 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4711 u
->load_state
= UNIT_STUB
;
4713 u
->transient
= true;
4715 unit_add_to_dbus_queue(u
);
4716 unit_add_to_gc_queue(u
);
4718 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4724 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4725 _cleanup_free_
char *comm
= NULL
;
4727 (void) get_process_comm(pid
, &comm
);
4729 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4730 only, like for example systemd's own PAM stub process. */
4731 if (comm
&& comm
[0] == '(')
4734 log_unit_notice(userdata
,
4735 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4738 signal_to_string(sig
));
4743 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4748 case KILL_TERMINATE
:
4749 case KILL_TERMINATE_AND_LOG
:
4750 *noteworthy
= false;
4751 return c
->kill_signal
;
4754 *noteworthy
= false;
4755 return restart_kill_signal(c
);
4759 return c
->final_kill_signal
;
4763 return c
->watchdog_signal
;
4766 assert_not_reached("KillOperation unknown");
4770 int unit_kill_context(
4776 bool main_pid_alien
) {
4778 bool wait_for_exit
= false, send_sighup
;
4779 cg_kill_log_func_t log_func
= NULL
;
4785 /* Kill the processes belonging to this unit, in preparation for shutting the unit down.
4786 * Returns > 0 if we killed something worth waiting for, 0 otherwise. */
4788 if (c
->kill_mode
== KILL_NONE
)
4792 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4794 log_func
= log_kill
;
4798 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4803 log_func(main_pid
, sig
, u
);
4805 r
= kill_and_sigcont(main_pid
, sig
);
4806 if (r
< 0 && r
!= -ESRCH
) {
4807 _cleanup_free_
char *comm
= NULL
;
4808 (void) get_process_comm(main_pid
, &comm
);
4810 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4812 if (!main_pid_alien
)
4813 wait_for_exit
= true;
4815 if (r
!= -ESRCH
&& send_sighup
)
4816 (void) kill(main_pid
, SIGHUP
);
4820 if (control_pid
> 0) {
4822 log_func(control_pid
, sig
, u
);
4824 r
= kill_and_sigcont(control_pid
, sig
);
4825 if (r
< 0 && r
!= -ESRCH
) {
4826 _cleanup_free_
char *comm
= NULL
;
4827 (void) get_process_comm(control_pid
, &comm
);
4829 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4831 wait_for_exit
= true;
4833 if (r
!= -ESRCH
&& send_sighup
)
4834 (void) kill(control_pid
, SIGHUP
);
4838 if (u
->cgroup_path
&&
4839 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4840 _cleanup_set_free_ Set
*pid_set
= NULL
;
4842 /* Exclude the main/control pids from being killed via the cgroup */
4843 pid_set
= unit_pid_set(main_pid
, control_pid
);
4847 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4849 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4853 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4854 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4858 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4859 * we are running in a container or if this is a delegation unit, simply because cgroup
4860 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4861 * of containers it can be confused easily by left-over directories in the cgroup — which
4862 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4863 * there we get proper events. Hence rely on them. */
4865 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4866 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4867 wait_for_exit
= true;
4872 pid_set
= unit_pid_set(main_pid
, control_pid
);
4876 cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4885 return wait_for_exit
;
4888 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4889 _cleanup_free_
char *p
= NULL
;
4890 UnitDependencyInfo di
;
4896 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these paths in
4897 * the unit (from the path to the UnitDependencyInfo structure indicating how to the dependency came to
4898 * be). However, we build a prefix table for all possible prefixes so that new appearing mount units can easily
4899 * determine which units to make themselves a dependency of. */
4901 if (!path_is_absolute(path
))
4904 r
= hashmap_ensure_allocated(&u
->requires_mounts_for
, &path_hash_ops
);
4912 path
= path_simplify(p
, true);
4914 if (!path_is_normalized(path
))
4917 if (hashmap_contains(u
->requires_mounts_for
, path
))
4920 di
= (UnitDependencyInfo
) {
4924 r
= hashmap_put(u
->requires_mounts_for
, path
, di
.data
);
4929 char prefix
[strlen(path
) + 1];
4930 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4933 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4935 _cleanup_free_
char *q
= NULL
;
4937 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4949 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4965 int unit_setup_exec_runtime(Unit
*u
) {
4973 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4976 /* Check if there already is an ExecRuntime for this unit? */
4977 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4981 /* Try to get it from somebody else */
4982 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_JOINS_NAMESPACE_OF
], i
) {
4983 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4988 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4991 int unit_setup_dynamic_creds(Unit
*u
) {
4993 DynamicCreds
*dcreds
;
4998 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
5000 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
5002 ec
= unit_get_exec_context(u
);
5005 if (!ec
->dynamic_user
)
5008 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
5011 bool unit_type_supported(UnitType t
) {
5012 if (_unlikely_(t
< 0))
5014 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
5017 if (!unit_vtable
[t
]->supported
)
5020 return unit_vtable
[t
]->supported();
5023 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
5029 r
= dir_is_empty(where
);
5030 if (r
> 0 || r
== -ENOTDIR
)
5033 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
5037 log_struct(LOG_NOTICE
,
5038 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5040 LOG_UNIT_INVOCATION_ID(u
),
5041 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
5045 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
5046 _cleanup_free_
char *canonical_where
= NULL
;
5052 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
5054 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
5058 /* We will happily ignore a trailing slash (or any redundant slashes) */
5059 if (path_equal(where
, canonical_where
))
5062 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
5064 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5066 LOG_UNIT_INVOCATION_ID(u
),
5067 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
5073 bool unit_is_pristine(Unit
*u
) {
5076 /* Check if the unit already exists or is already around,
5077 * in a number of different ways. Note that to cater for unit
5078 * types such as slice, we are generally fine with units that
5079 * are marked UNIT_LOADED even though nothing was actually
5080 * loaded, as those unit types don't require a file on disk. */
5082 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
5085 !strv_isempty(u
->dropin_paths
) ||
5090 pid_t
unit_control_pid(Unit
*u
) {
5093 if (UNIT_VTABLE(u
)->control_pid
)
5094 return UNIT_VTABLE(u
)->control_pid(u
);
5099 pid_t
unit_main_pid(Unit
*u
) {
5102 if (UNIT_VTABLE(u
)->main_pid
)
5103 return UNIT_VTABLE(u
)->main_pid(u
);
5108 static void unit_unref_uid_internal(
5112 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
5116 assert(_manager_unref_uid
);
5118 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
5119 * gid_t are actually the same time, with the same validity rules.
5121 * Drops a reference to UID/GID from a unit. */
5123 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5124 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5126 if (!uid_is_valid(*ref_uid
))
5129 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
5130 *ref_uid
= UID_INVALID
;
5133 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
5134 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
5137 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
5138 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
5141 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
5144 unit_unref_uid(u
, destroy_now
);
5145 unit_unref_gid(u
, destroy_now
);
5148 static int unit_ref_uid_internal(
5153 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
5159 assert(uid_is_valid(uid
));
5160 assert(_manager_ref_uid
);
5162 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
5163 * are actually the same type, and have the same validity rules.
5165 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
5166 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
5169 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5170 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5172 if (*ref_uid
== uid
)
5175 if (uid_is_valid(*ref_uid
)) /* Already set? */
5178 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
5186 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
5187 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
5190 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
5191 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
5194 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
5199 /* Reference both a UID and a GID in one go. Either references both, or neither. */
5201 if (uid_is_valid(uid
)) {
5202 r
= unit_ref_uid(u
, uid
, clean_ipc
);
5207 if (gid_is_valid(gid
)) {
5208 q
= unit_ref_gid(u
, gid
, clean_ipc
);
5211 unit_unref_uid(u
, false);
5217 return r
> 0 || q
> 0;
5220 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
5226 c
= unit_get_exec_context(u
);
5228 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
5230 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
5235 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
5240 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
5241 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
5242 * objects when no service references the UID/GID anymore. */
5244 r
= unit_ref_uid_gid(u
, uid
, gid
);
5246 unit_add_to_dbus_queue(u
);
5249 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
5254 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
5256 if (sd_id128_equal(u
->invocation_id
, id
))
5259 if (!sd_id128_is_null(u
->invocation_id
))
5260 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
5262 if (sd_id128_is_null(id
)) {
5267 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
5271 u
->invocation_id
= id
;
5272 sd_id128_to_string(id
, u
->invocation_id_string
);
5274 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
5281 u
->invocation_id
= SD_ID128_NULL
;
5282 u
->invocation_id_string
[0] = 0;
5286 int unit_acquire_invocation_id(Unit
*u
) {
5292 r
= sd_id128_randomize(&id
);
5294 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
5296 r
= unit_set_invocation_id(u
, id
);
5298 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5300 unit_add_to_dbus_queue(u
);
5304 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5310 /* Copy parameters from manager */
5311 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5315 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5316 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5317 p
->prefix
= u
->manager
->prefix
;
5318 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5320 /* Copy parameters from unit */
5321 p
->cgroup_path
= u
->cgroup_path
;
5322 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5327 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5333 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5334 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5336 (void) unit_realize_cgroup(u
);
5338 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5342 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
, -1);
5343 (void) ignore_signals(SIGPIPE
, -1);
5345 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5347 if (u
->cgroup_path
) {
5348 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5350 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5358 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5365 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5369 int ret
= EXIT_SUCCESS
;
5372 STRV_FOREACH(i
, paths
) {
5373 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5375 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5383 r
= unit_watch_pid(u
, pid
, true);
5391 static void unit_update_dependency_mask(Unit
*u
, UnitDependency d
, Unit
*other
, UnitDependencyInfo di
) {
5394 assert(d
< _UNIT_DEPENDENCY_MAX
);
5397 if (di
.origin_mask
== 0 && di
.destination_mask
== 0) {
5398 /* No bit set anymore, let's drop the whole entry */
5399 assert_se(hashmap_remove(u
->dependencies
[d
], other
));
5400 log_unit_debug(u
, "lost dependency %s=%s", unit_dependency_to_string(d
), other
->id
);
5402 /* Mask was reduced, let's update the entry */
5403 assert_se(hashmap_update(u
->dependencies
[d
], other
, di
.data
) == 0);
5406 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5411 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5416 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
5420 UnitDependencyInfo di
;
5426 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
5429 if ((di
.origin_mask
& ~mask
) == di
.origin_mask
)
5431 di
.origin_mask
&= ~mask
;
5432 unit_update_dependency_mask(u
, d
, other
, di
);
5434 /* We updated the dependency from our unit to the other unit now. But most dependencies
5435 * imply a reverse dependency. Hence, let's delete that one too. For that we go through
5436 * all dependency types on the other unit and delete all those which point to us and
5437 * have the right mask set. */
5439 for (q
= 0; q
< _UNIT_DEPENDENCY_MAX
; q
++) {
5440 UnitDependencyInfo dj
;
5442 dj
.data
= hashmap_get(other
->dependencies
[q
], u
);
5443 if ((dj
.destination_mask
& ~mask
) == dj
.destination_mask
)
5445 dj
.destination_mask
&= ~mask
;
5447 unit_update_dependency_mask(other
, q
, u
, dj
);
5450 unit_add_to_gc_queue(other
);
5460 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5467 if (MANAGER_IS_SYSTEM(u
->manager
))
5468 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5470 _cleanup_free_
char *user_path
= NULL
;
5471 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5474 p
= strjoin(user_path
, u
->id
);
5484 static int unit_export_invocation_id(Unit
*u
) {
5485 _cleanup_free_
char *p
= NULL
;
5490 if (u
->exported_invocation_id
)
5493 if (sd_id128_is_null(u
->invocation_id
))
5496 r
= unit_get_invocation_path(u
, &p
);
5498 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5500 r
= symlink_atomic(u
->invocation_id_string
, p
);
5502 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5504 u
->exported_invocation_id
= true;
5508 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5516 if (u
->exported_log_level_max
)
5519 if (c
->log_level_max
< 0)
5522 assert(c
->log_level_max
<= 7);
5524 buf
[0] = '0' + c
->log_level_max
;
5527 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5528 r
= symlink_atomic(buf
, p
);
5530 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5532 u
->exported_log_level_max
= true;
5536 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5537 _cleanup_close_
int fd
= -1;
5538 struct iovec
*iovec
;
5546 if (u
->exported_log_extra_fields
)
5549 if (c
->n_log_extra_fields
<= 0)
5552 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5553 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5555 for (i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5556 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5558 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5559 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5562 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5563 pattern
= strjoina(p
, ".XXXXXX");
5565 fd
= mkostemp_safe(pattern
);
5567 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5569 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5571 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5575 (void) fchmod(fd
, 0644);
5577 if (rename(pattern
, p
) < 0) {
5578 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5582 u
->exported_log_extra_fields
= true;
5586 (void) unlink(pattern
);
5590 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5591 _cleanup_free_
char *buf
= NULL
;
5598 if (u
->exported_log_ratelimit_interval
)
5601 if (c
->log_ratelimit_interval_usec
== 0)
5604 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5606 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5609 r
= symlink_atomic(buf
, p
);
5611 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5613 u
->exported_log_ratelimit_interval
= true;
5617 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5618 _cleanup_free_
char *buf
= NULL
;
5625 if (u
->exported_log_ratelimit_burst
)
5628 if (c
->log_ratelimit_burst
== 0)
5631 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5633 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5636 r
= symlink_atomic(buf
, p
);
5638 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5640 u
->exported_log_ratelimit_burst
= true;
5644 void unit_export_state_files(Unit
*u
) {
5645 const ExecContext
*c
;
5652 if (MANAGER_IS_TEST_RUN(u
->manager
))
5655 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5656 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5657 * the IPC system itself and PID 1 also log to the journal.
5659 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5660 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5661 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5662 * namespace at least.
5664 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5665 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5668 (void) unit_export_invocation_id(u
);
5670 if (!MANAGER_IS_SYSTEM(u
->manager
))
5673 c
= unit_get_exec_context(u
);
5675 (void) unit_export_log_level_max(u
, c
);
5676 (void) unit_export_log_extra_fields(u
, c
);
5677 (void) unit_export_log_ratelimit_interval(u
, c
);
5678 (void) unit_export_log_ratelimit_burst(u
, c
);
5682 void unit_unlink_state_files(Unit
*u
) {
5690 /* Undoes the effect of unit_export_state() */
5692 if (u
->exported_invocation_id
) {
5693 _cleanup_free_
char *invocation_path
= NULL
;
5694 int r
= unit_get_invocation_path(u
, &invocation_path
);
5696 (void) unlink(invocation_path
);
5697 u
->exported_invocation_id
= false;
5701 if (!MANAGER_IS_SYSTEM(u
->manager
))
5704 if (u
->exported_log_level_max
) {
5705 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5708 u
->exported_log_level_max
= false;
5711 if (u
->exported_log_extra_fields
) {
5712 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5715 u
->exported_log_extra_fields
= false;
5718 if (u
->exported_log_ratelimit_interval
) {
5719 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5722 u
->exported_log_ratelimit_interval
= false;
5725 if (u
->exported_log_ratelimit_burst
) {
5726 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5729 u
->exported_log_ratelimit_burst
= false;
5733 int unit_prepare_exec(Unit
*u
) {
5738 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5739 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5740 r
= bpf_firewall_load_custom(u
);
5744 /* Prepares everything so that we can fork of a process for this unit */
5746 (void) unit_realize_cgroup(u
);
5748 if (u
->reset_accounting
) {
5749 (void) unit_reset_accounting(u
);
5750 u
->reset_accounting
= false;
5753 unit_export_state_files(u
);
5755 r
= unit_setup_exec_runtime(u
);
5759 r
= unit_setup_dynamic_creds(u
);
5766 static int log_leftover(pid_t pid
, int sig
, void *userdata
) {
5767 _cleanup_free_
char *comm
= NULL
;
5769 (void) get_process_comm(pid
, &comm
);
5771 if (comm
&& comm
[0] == '(') /* Most likely our own helper process (PAM?), ignore */
5774 log_unit_warning(userdata
,
5775 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5776 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5782 int unit_warn_leftover_processes(Unit
*u
) {
5785 (void) unit_pick_cgroup_path(u
);
5787 if (!u
->cgroup_path
)
5790 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_leftover
, u
);
5793 bool unit_needs_console(Unit
*u
) {
5795 UnitActiveState state
;
5799 state
= unit_active_state(u
);
5801 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5804 if (UNIT_VTABLE(u
)->needs_console
)
5805 return UNIT_VTABLE(u
)->needs_console(u
);
5807 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5808 ec
= unit_get_exec_context(u
);
5812 return exec_context_may_touch_console(ec
);
5815 const char *unit_label_path(const Unit
*u
) {
5820 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5821 * when validating access checks. */
5823 p
= u
->source_path
?: u
->fragment_path
;
5827 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5828 if (path_equal(p
, "/dev/null"))
5834 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5839 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5840 * and not a kernel thread either */
5842 /* First, a simple range check */
5843 if (!pid_is_valid(pid
))
5844 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5846 /* Some extra safety check */
5847 if (pid
== 1 || pid
== getpid_cached())
5848 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5850 /* Don't even begin to bother with kernel threads */
5851 r
= is_kernel_thread(pid
);
5853 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5855 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5857 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5862 void unit_log_success(Unit
*u
) {
5865 log_struct(LOG_INFO
,
5866 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5868 LOG_UNIT_INVOCATION_ID(u
),
5869 LOG_UNIT_MESSAGE(u
, "Succeeded."));
5872 void unit_log_failure(Unit
*u
, const char *result
) {
5876 log_struct(LOG_WARNING
,
5877 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5879 LOG_UNIT_INVOCATION_ID(u
),
5880 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5881 "UNIT_RESULT=%s", result
);
5884 void unit_log_skip(Unit
*u
, const char *result
) {
5888 log_struct(LOG_INFO
,
5889 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5891 LOG_UNIT_INVOCATION_ID(u
),
5892 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5893 "UNIT_RESULT=%s", result
);
5896 void unit_log_process_exit(
5899 const char *command
,
5909 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5910 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5911 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5915 else if (code
== CLD_EXITED
)
5918 level
= LOG_WARNING
;
5921 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5922 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s",
5924 sigchld_code_to_string(code
), status
,
5925 strna(code
== CLD_EXITED
5926 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5927 : signal_to_string(status
))),
5928 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5929 "EXIT_STATUS=%i", status
,
5930 "COMMAND=%s", strna(command
),
5932 LOG_UNIT_INVOCATION_ID(u
));
5935 int unit_exit_status(Unit
*u
) {
5938 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5939 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5940 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5941 * service process has exited abnormally (signal/coredump). */
5943 if (!UNIT_VTABLE(u
)->exit_status
)
5946 return UNIT_VTABLE(u
)->exit_status(u
);
5949 int unit_failure_action_exit_status(Unit
*u
) {
5954 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5956 if (u
->failure_action_exit_status
>= 0)
5957 return u
->failure_action_exit_status
;
5959 r
= unit_exit_status(u
);
5960 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5966 int unit_success_action_exit_status(Unit
*u
) {
5971 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5973 if (u
->success_action_exit_status
>= 0)
5974 return u
->success_action_exit_status
;
5976 r
= unit_exit_status(u
);
5977 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5983 int unit_test_trigger_loaded(Unit
*u
) {
5986 /* Tests whether the unit to trigger is loaded */
5988 trigger
= UNIT_TRIGGER(u
);
5990 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5991 "Refusing to start, no unit to trigger.");
5992 if (trigger
->load_state
!= UNIT_LOADED
)
5993 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5994 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5999 void unit_destroy_runtime_directory(Unit
*u
, const ExecContext
*context
) {
6000 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
6001 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
6002 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
6005 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
6006 UnitActiveState state
;
6010 /* Special return values:
6012 * -EOPNOTSUPP → cleaning not supported for this unit type
6013 * -EUNATCH → cleaning not defined for this resource type
6014 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
6015 * a job queued or similar
6018 if (!UNIT_VTABLE(u
)->clean
)
6024 if (u
->load_state
!= UNIT_LOADED
)
6030 state
= unit_active_state(u
);
6031 if (!IN_SET(state
, UNIT_INACTIVE
))
6034 return UNIT_VTABLE(u
)->clean(u
, mask
);
6037 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
6040 if (!UNIT_VTABLE(u
)->clean
||
6041 u
->load_state
!= UNIT_LOADED
) {
6046 /* When the clean() method is set, can_clean() really should be set too */
6047 assert(UNIT_VTABLE(u
)->can_clean
);
6049 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
6052 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
6053 [COLLECT_INACTIVE
] = "inactive",
6054 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
6057 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);