1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
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 "core-varlink.h"
19 #include "dbus-unit.h"
25 #include "fileio-label.h"
27 #include "format-util.h"
28 #include "id128-util.h"
32 #include "load-dropin.h"
33 #include "load-fragment.h"
36 #include "missing_audit.h"
38 #include "parse-util.h"
39 #include "path-util.h"
40 #include "process-util.h"
42 #include "serialize.h"
44 #include "signal-util.h"
45 #include "sparse-endian.h"
47 #include "specifier.h"
48 #include "stat-util.h"
49 #include "stdio-util.h"
50 #include "string-table.h"
51 #include "string-util.h"
53 #include "terminal-util.h"
54 #include "tmpfile-util.h"
55 #include "umask-util.h"
56 #include "unit-name.h"
58 #include "user-util.h"
61 /* Thresholds for logging at INFO level about resource consumption */
62 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
63 #define MENTIONWORTHY_IO_BYTES (1024 * 1024ULL)
64 #define MENTIONWORTHY_IP_BYTES (0ULL)
66 /* Thresholds for logging at INFO level about resource consumption */
67 #define NOTICEWORTHY_CPU_NSEC (10*60 * NSEC_PER_SEC) /* 10 minutes */
68 #define NOTICEWORTHY_IO_BYTES (10 * 1024 * 1024ULL) /* 10 MB */
69 #define NOTICEWORTHY_IP_BYTES (128 * 1024 * 1024ULL) /* 128 MB */
71 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
72 [UNIT_SERVICE
] = &service_vtable
,
73 [UNIT_SOCKET
] = &socket_vtable
,
74 [UNIT_TARGET
] = &target_vtable
,
75 [UNIT_DEVICE
] = &device_vtable
,
76 [UNIT_MOUNT
] = &mount_vtable
,
77 [UNIT_AUTOMOUNT
] = &automount_vtable
,
78 [UNIT_SWAP
] = &swap_vtable
,
79 [UNIT_TIMER
] = &timer_vtable
,
80 [UNIT_PATH
] = &path_vtable
,
81 [UNIT_SLICE
] = &slice_vtable
,
82 [UNIT_SCOPE
] = &scope_vtable
,
85 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
);
87 Unit
*unit_new(Manager
*m
, size_t size
) {
91 assert(size
>= sizeof(Unit
));
98 u
->type
= _UNIT_TYPE_INVALID
;
99 u
->default_dependencies
= true;
100 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
101 u
->unit_file_preset
= -1;
102 u
->on_failure_job_mode
= JOB_REPLACE
;
103 u
->cgroup_control_inotify_wd
= -1;
104 u
->cgroup_memory_inotify_wd
= -1;
105 u
->job_timeout
= USEC_INFINITY
;
106 u
->job_running_timeout
= USEC_INFINITY
;
107 u
->ref_uid
= UID_INVALID
;
108 u
->ref_gid
= GID_INVALID
;
109 u
->cpu_usage_last
= NSEC_INFINITY
;
110 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
111 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
113 u
->ip_accounting_ingress_map_fd
= -1;
114 u
->ip_accounting_egress_map_fd
= -1;
115 u
->ipv4_allow_map_fd
= -1;
116 u
->ipv6_allow_map_fd
= -1;
117 u
->ipv4_deny_map_fd
= -1;
118 u
->ipv6_deny_map_fd
= -1;
120 u
->last_section_private
= -1;
122 u
->start_ratelimit
= (RateLimit
) { m
->default_start_limit_interval
, m
->default_start_limit_burst
};
123 u
->auto_stop_ratelimit
= (RateLimit
) { 10 * USEC_PER_SEC
, 16 };
125 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
126 u
->io_accounting_last
[i
] = UINT64_MAX
;
131 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
132 _cleanup_(unit_freep
) Unit
*u
= NULL
;
135 u
= unit_new(m
, size
);
139 r
= unit_add_name(u
, name
);
148 bool unit_has_name(const Unit
*u
, const char *name
) {
152 return streq_ptr(name
, u
->id
) ||
153 set_contains(u
->aliases
, name
);
156 static void unit_init(Unit
*u
) {
163 assert(u
->type
>= 0);
165 cc
= unit_get_cgroup_context(u
);
167 cgroup_context_init(cc
);
169 /* Copy in the manager defaults into the cgroup
170 * context, _before_ the rest of the settings have
171 * been initialized */
173 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
174 cc
->io_accounting
= u
->manager
->default_io_accounting
;
175 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
176 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
177 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
178 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
180 if (u
->type
!= UNIT_SLICE
)
181 cc
->tasks_max
= u
->manager
->default_tasks_max
;
184 ec
= unit_get_exec_context(u
);
186 exec_context_init(ec
);
188 if (MANAGER_IS_SYSTEM(u
->manager
))
189 ec
->keyring_mode
= EXEC_KEYRING_SHARED
;
191 ec
->keyring_mode
= EXEC_KEYRING_INHERIT
;
193 /* User manager might have its umask redefined by PAM or UMask=. In this
194 * case let the units it manages inherit this value by default. They can
195 * still tune this value through their own unit file */
196 (void) get_process_umask(getpid_cached(), &ec
->umask
);
200 kc
= unit_get_kill_context(u
);
202 kill_context_init(kc
);
204 if (UNIT_VTABLE(u
)->init
)
205 UNIT_VTABLE(u
)->init(u
);
208 static int unit_add_alias(Unit
*u
, char *donated_name
) {
211 /* Make sure that u->names is allocated. We may leave u->names
212 * empty if we fail later, but this is not a problem. */
213 r
= set_ensure_put(&u
->aliases
, &string_hash_ops
, donated_name
);
221 int unit_add_name(Unit
*u
, const char *text
) {
222 _cleanup_free_
char *name
= NULL
, *instance
= NULL
;
229 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
231 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
232 "instance is not set when adding name '%s': %m", text
);
234 r
= unit_name_replace_instance(text
, u
->instance
, &name
);
236 return log_unit_debug_errno(u
, r
,
237 "failed to build instance name from '%s': %m", text
);
244 if (unit_has_name(u
, name
))
247 if (hashmap_contains(u
->manager
->units
, name
))
248 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
249 "unit already exist when adding name '%s': %m", name
);
251 if (!unit_name_is_valid(name
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
252 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
253 "name '%s' is invalid: %m", name
);
255 t
= unit_name_to_type(name
);
257 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
258 "failed to derive unit type from name '%s': %m", name
);
260 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
261 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
262 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
265 r
= unit_name_to_instance(name
, &instance
);
267 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", name
);
269 if (instance
&& !unit_type_may_template(t
))
270 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", name
);
272 /* Ensure that this unit either has no instance, or that the instance matches. */
273 if (u
->type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->instance
, instance
))
274 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
275 "cannot add name %s, the instances don't match (\"%s\" != \"%s\").",
276 name
, instance
, u
->instance
);
278 if (u
->id
&& !unit_type_may_alias(t
))
279 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
280 "cannot add name %s, aliases are not allowed for %s units.",
281 name
, unit_type_to_string(t
));
283 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
284 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "cannot add name, manager has too many units: %m");
286 /* Add name to the global hashmap first, because that's easier to undo */
287 r
= hashmap_put(u
->manager
->units
, name
, u
);
289 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
292 r
= unit_add_alias(u
, name
); /* unit_add_alias() takes ownership of the name on success */
294 hashmap_remove(u
->manager
->units
, name
);
300 /* A new name, we don't need the set yet. */
301 assert(u
->type
== _UNIT_TYPE_INVALID
);
302 assert(!u
->instance
);
305 u
->id
= TAKE_PTR(name
);
306 u
->instance
= TAKE_PTR(instance
);
308 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
312 unit_add_to_dbus_queue(u
);
316 int unit_choose_id(Unit
*u
, const char *name
) {
317 _cleanup_free_
char *t
= NULL
;
324 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
328 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
335 if (streq_ptr(u
->id
, name
))
336 return 0; /* Nothing to do. */
338 /* Selects one of the aliases of this unit as the id */
339 s
= set_get(u
->aliases
, (char*) name
);
344 r
= set_remove_and_put(u
->aliases
, name
, u
->id
);
348 assert_se(set_remove(u
->aliases
, name
)); /* see set_get() above… */
350 u
->id
= s
; /* Old u->id is now stored in the set, and s is not stored anywhere */
351 unit_add_to_dbus_queue(u
);
356 int unit_set_description(Unit
*u
, const char *description
) {
361 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
365 unit_add_to_dbus_queue(u
);
370 bool unit_may_gc(Unit
*u
) {
371 UnitActiveState state
;
376 /* Checks whether the unit is ready to be unloaded for garbage collection.
377 * Returns true when the unit may be collected, and false if there's some
378 * reason to keep it loaded.
380 * References from other units are *not* checked here. Instead, this is done
381 * in unit_gc_sweep(), but using markers to properly collect dependency loops.
390 state
= unit_active_state(u
);
392 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
393 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
394 UNIT_VTABLE(u
)->release_resources
)
395 UNIT_VTABLE(u
)->release_resources(u
);
400 if (sd_bus_track_count(u
->bus_track
) > 0)
403 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
404 switch (u
->collect_mode
) {
406 case COLLECT_INACTIVE
:
407 if (state
!= UNIT_INACTIVE
)
412 case COLLECT_INACTIVE_OR_FAILED
:
413 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
419 assert_not_reached("Unknown garbage collection mode");
422 if (u
->cgroup_path
) {
423 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
424 * around. Units with active processes should never be collected. */
426 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
428 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
433 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_gc(u
))
439 void unit_add_to_load_queue(Unit
*u
) {
441 assert(u
->type
!= _UNIT_TYPE_INVALID
);
443 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
446 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
447 u
->in_load_queue
= true;
450 void unit_add_to_cleanup_queue(Unit
*u
) {
453 if (u
->in_cleanup_queue
)
456 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
457 u
->in_cleanup_queue
= true;
460 void unit_add_to_gc_queue(Unit
*u
) {
463 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
469 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
470 u
->in_gc_queue
= true;
473 void unit_add_to_dbus_queue(Unit
*u
) {
475 assert(u
->type
!= _UNIT_TYPE_INVALID
);
477 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
480 /* Shortcut things if nobody cares */
481 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
482 sd_bus_track_count(u
->bus_track
) <= 0 &&
483 set_isempty(u
->manager
->private_buses
)) {
484 u
->sent_dbus_new_signal
= true;
488 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
489 u
->in_dbus_queue
= true;
492 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
495 if (u
->in_stop_when_unneeded_queue
)
498 if (!u
->stop_when_unneeded
)
501 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
504 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
505 u
->in_stop_when_unneeded_queue
= true;
508 static void bidi_set_free(Unit
*u
, Hashmap
*h
) {
514 /* Frees the hashmap and makes sure we are dropped from the inverse pointers */
516 HASHMAP_FOREACH_KEY(v
, other
, h
) {
517 for (UnitDependency d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
518 hashmap_remove(other
->dependencies
[d
], u
);
520 unit_add_to_gc_queue(other
);
526 static void unit_remove_transient(Unit
*u
) {
534 if (u
->fragment_path
)
535 (void) unlink(u
->fragment_path
);
537 STRV_FOREACH(i
, u
->dropin_paths
) {
538 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
540 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
544 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
548 /* Only drop transient drop-ins */
549 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
557 static void unit_free_requires_mounts_for(Unit
*u
) {
561 _cleanup_free_
char *path
;
563 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
567 char s
[strlen(path
) + 1];
569 PATH_FOREACH_PREFIX_MORE(s
, path
) {
573 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
577 (void) set_remove(x
, u
);
579 if (set_isempty(x
)) {
580 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
588 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
591 static void unit_done(Unit
*u
) {
600 if (UNIT_VTABLE(u
)->done
)
601 UNIT_VTABLE(u
)->done(u
);
603 ec
= unit_get_exec_context(u
);
605 exec_context_done(ec
);
607 cc
= unit_get_cgroup_context(u
);
609 cgroup_context_done(cc
);
612 void unit_free(Unit
*u
) {
618 u
->transient_file
= safe_fclose(u
->transient_file
);
620 if (!MANAGER_IS_RELOADING(u
->manager
))
621 unit_remove_transient(u
);
623 bus_unit_send_removed_signal(u
);
627 unit_dequeue_rewatch_pids(u
);
629 sd_bus_slot_unref(u
->match_bus_slot
);
630 sd_bus_track_unref(u
->bus_track
);
631 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
632 u
->pending_freezer_message
= sd_bus_message_unref(u
->pending_freezer_message
);
634 unit_free_requires_mounts_for(u
);
636 SET_FOREACH(t
, u
->aliases
)
637 hashmap_remove_value(u
->manager
->units
, t
, u
);
639 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
641 if (!sd_id128_is_null(u
->invocation_id
))
642 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
656 for (UnitDependency d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
657 bidi_set_free(u
, u
->dependencies
[d
]);
659 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
660 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
661 if (UNIT_ISSET(u
->slice
))
662 unit_add_family_to_cgroup_realize_queue(UNIT_DEREF(u
->slice
));
665 manager_unref_console(u
->manager
);
667 unit_release_cgroup(u
);
669 if (!MANAGER_IS_RELOADING(u
->manager
))
670 unit_unlink_state_files(u
);
672 unit_unref_uid_gid(u
, false);
674 (void) manager_update_failed_units(u
->manager
, u
, false);
675 set_remove(u
->manager
->startup_units
, u
);
677 unit_unwatch_all_pids(u
);
679 unit_ref_unset(&u
->slice
);
680 while (u
->refs_by_target
)
681 unit_ref_unset(u
->refs_by_target
);
683 if (u
->type
!= _UNIT_TYPE_INVALID
)
684 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
686 if (u
->in_load_queue
)
687 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
689 if (u
->in_dbus_queue
)
690 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
693 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
695 if (u
->in_cgroup_realize_queue
)
696 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
698 if (u
->in_cgroup_empty_queue
)
699 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
701 if (u
->in_cleanup_queue
)
702 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
704 if (u
->in_target_deps_queue
)
705 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
707 if (u
->in_stop_when_unneeded_queue
)
708 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
710 safe_close(u
->ip_accounting_ingress_map_fd
);
711 safe_close(u
->ip_accounting_egress_map_fd
);
713 safe_close(u
->ipv4_allow_map_fd
);
714 safe_close(u
->ipv6_allow_map_fd
);
715 safe_close(u
->ipv4_deny_map_fd
);
716 safe_close(u
->ipv6_deny_map_fd
);
718 bpf_program_unref(u
->ip_bpf_ingress
);
719 bpf_program_unref(u
->ip_bpf_ingress_installed
);
720 bpf_program_unref(u
->ip_bpf_egress
);
721 bpf_program_unref(u
->ip_bpf_egress_installed
);
723 set_free(u
->ip_bpf_custom_ingress
);
724 set_free(u
->ip_bpf_custom_egress
);
725 set_free(u
->ip_bpf_custom_ingress_installed
);
726 set_free(u
->ip_bpf_custom_egress_installed
);
728 bpf_program_unref(u
->bpf_device_control_installed
);
730 condition_free_list(u
->conditions
);
731 condition_free_list(u
->asserts
);
733 free(u
->description
);
734 strv_free(u
->documentation
);
735 free(u
->fragment_path
);
736 free(u
->source_path
);
737 strv_free(u
->dropin_paths
);
740 free(u
->job_timeout_reboot_arg
);
743 set_free_free(u
->aliases
);
749 FreezerState
unit_freezer_state(Unit
*u
) {
752 return u
->freezer_state
;
755 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
756 char *values
[1] = {};
761 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
762 STRV_MAKE("frozen"), values
);
766 r
= _FREEZER_STATE_INVALID
;
769 if (streq(values
[0], "0"))
771 else if (streq(values
[0], "1"))
781 UnitActiveState
unit_active_state(Unit
*u
) {
784 if (u
->load_state
== UNIT_MERGED
)
785 return unit_active_state(unit_follow_merge(u
));
787 /* After a reload it might happen that a unit is not correctly
788 * loaded but still has a process around. That's why we won't
789 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
791 return UNIT_VTABLE(u
)->active_state(u
);
794 const char* unit_sub_state_to_string(Unit
*u
) {
797 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
800 static int hashmap_complete_move(Hashmap
**s
, Hashmap
**other
) {
808 return hashmap_move(*s
, *other
);
810 *s
= TAKE_PTR(*other
);
815 static int merge_names(Unit
*u
, Unit
*other
) {
822 r
= unit_add_alias(u
, other
->id
);
826 r
= set_move(u
->aliases
, other
->aliases
);
828 set_remove(u
->aliases
, other
->id
);
833 other
->aliases
= set_free_free(other
->aliases
);
835 SET_FOREACH(name
, u
->aliases
)
836 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
841 static int reserve_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
846 assert(d
< _UNIT_DEPENDENCY_MAX
);
849 * If u does not have this dependency set allocated, there is no need
850 * to reserve anything. In that case other's set will be transferred
851 * as a whole to u by complete_move().
853 if (!u
->dependencies
[d
])
856 /* merge_dependencies() will skip a u-on-u dependency */
857 n_reserve
= hashmap_size(other
->dependencies
[d
]) - !!hashmap_get(other
->dependencies
[d
], u
);
859 return hashmap_reserve(u
->dependencies
[d
], n_reserve
);
862 static void merge_dependencies(Unit
*u
, Unit
*other
, const char *other_id
, UnitDependency d
) {
867 /* Merges all dependencies of type 'd' of the unit 'other' into the deps of the unit 'u' */
871 assert(d
< _UNIT_DEPENDENCY_MAX
);
873 /* Fix backwards pointers. Let's iterate through all dependent units of the other unit. */
874 HASHMAP_FOREACH_KEY(v
, back
, other
->dependencies
[d
])
876 /* Let's now iterate through the dependencies of that dependencies of the other units,
877 * looking for pointers back, and let's fix them up, to instead point to 'u'. */
878 for (UnitDependency k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++)
880 /* Do not add dependencies between u and itself. */
881 if (hashmap_remove(back
->dependencies
[k
], other
))
882 maybe_warn_about_dependency(u
, other_id
, k
);
884 UnitDependencyInfo di_u
, di_other
;
886 /* Let's drop this dependency between "back" and "other", and let's create it between
887 * "back" and "u" instead. Let's merge the bit masks of the dependency we are moving,
888 * and any such dependency which might already exist */
890 di_other
.data
= hashmap_get(back
->dependencies
[k
], other
);
892 continue; /* dependency isn't set, let's try the next one */
894 di_u
.data
= hashmap_get(back
->dependencies
[k
], u
);
896 UnitDependencyInfo di_merged
= {
897 .origin_mask
= di_u
.origin_mask
| di_other
.origin_mask
,
898 .destination_mask
= di_u
.destination_mask
| di_other
.destination_mask
,
901 r
= hashmap_remove_and_replace(back
->dependencies
[k
], other
, u
, di_merged
.data
);
903 log_warning_errno(r
, "Failed to remove/replace: back=%s other=%s u=%s: %m", back
->id
, other_id
, u
->id
);
906 /* assert_se(hashmap_remove_and_replace(back->dependencies[k], other, u, di_merged.data) >= 0); */
909 /* Also do not move dependencies on u to itself */
910 back
= hashmap_remove(other
->dependencies
[d
], u
);
912 maybe_warn_about_dependency(u
, other_id
, d
);
914 /* The move cannot fail. The caller must have performed a reservation. */
915 assert_se(hashmap_complete_move(&u
->dependencies
[d
], &other
->dependencies
[d
]) == 0);
917 other
->dependencies
[d
] = hashmap_free(other
->dependencies
[d
]);
920 int unit_merge(Unit
*u
, Unit
*other
) {
921 const char *other_id
= NULL
;
926 assert(u
->manager
== other
->manager
);
927 assert(u
->type
!= _UNIT_TYPE_INVALID
);
929 other
= unit_follow_merge(other
);
934 if (u
->type
!= other
->type
)
937 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
940 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
943 if (!streq_ptr(u
->instance
, other
->instance
))
952 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
956 other_id
= strdupa(other
->id
);
958 /* Make reservations to ensure merge_dependencies() won't fail */
959 for (UnitDependency d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
960 r
= reserve_dependencies(u
, other
, d
);
962 * We don't rollback reservations if we fail. We don't have
963 * a way to undo reservations. A reservation is not a leak.
970 r
= merge_names(u
, other
);
974 /* Redirect all references */
975 while (other
->refs_by_target
)
976 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
978 /* Merge dependencies */
979 for (UnitDependency d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
980 merge_dependencies(u
, other
, other_id
, d
);
982 other
->load_state
= UNIT_MERGED
;
983 other
->merged_into
= u
;
985 /* If there is still some data attached to the other node, we
986 * don't need it anymore, and can free it. */
987 if (other
->load_state
!= UNIT_STUB
)
988 if (UNIT_VTABLE(other
)->done
)
989 UNIT_VTABLE(other
)->done(other
);
991 unit_add_to_dbus_queue(u
);
992 unit_add_to_cleanup_queue(other
);
997 int unit_merge_by_name(Unit
*u
, const char *name
) {
998 _cleanup_free_
char *s
= NULL
;
1002 /* Either add name to u, or if a unit with name already exists, merge it with u.
1003 * If name is a template, do the same for name@instance, where instance is u's instance. */
1008 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1012 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1019 other
= manager_get_unit(u
->manager
, name
);
1021 return unit_merge(u
, other
);
1023 return unit_add_name(u
, name
);
1026 Unit
* unit_follow_merge(Unit
*u
) {
1029 while (u
->load_state
== UNIT_MERGED
)
1030 assert_se(u
= u
->merged_into
);
1035 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1041 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1042 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1047 if (c
->root_directory
) {
1048 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1053 if (c
->root_image
) {
1054 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1059 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1060 if (!u
->manager
->prefix
[dt
])
1064 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
1065 _cleanup_free_
char *p
;
1067 p
= path_join(u
->manager
->prefix
[dt
], *dp
);
1071 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1077 if (!MANAGER_IS_SYSTEM(u
->manager
))
1080 /* For the following three directory types we need write access, and /var/ is possibly on the root
1081 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1082 if (!strv_isempty(c
->directories
[EXEC_DIRECTORY_STATE
].paths
) ||
1083 !strv_isempty(c
->directories
[EXEC_DIRECTORY_CACHE
].paths
) ||
1084 !strv_isempty(c
->directories
[EXEC_DIRECTORY_LOGS
].paths
)) {
1085 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1090 if (c
->private_tmp
) {
1093 FOREACH_STRING(p
, "/tmp", "/var/tmp") {
1094 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1099 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1104 if (c
->root_image
) {
1105 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1106 * implicit dependency on udev */
1108 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1113 if (!IN_SET(c
->std_output
,
1114 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1115 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1116 !IN_SET(c
->std_error
,
1117 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1118 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1122 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1125 if (c
->log_namespace
) {
1126 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1128 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1132 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1136 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1140 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1144 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1151 const char *unit_description(Unit
*u
) {
1155 return u
->description
;
1157 return strna(u
->id
);
1160 const char *unit_status_string(Unit
*u
) {
1163 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
&& u
->id
)
1166 return unit_description(u
);
1169 static void print_unit_dependency_mask(FILE *f
, const char *kind
, UnitDependencyMask mask
, bool *space
) {
1171 UnitDependencyMask mask
;
1174 { UNIT_DEPENDENCY_FILE
, "file" },
1175 { UNIT_DEPENDENCY_IMPLICIT
, "implicit" },
1176 { UNIT_DEPENDENCY_DEFAULT
, "default" },
1177 { UNIT_DEPENDENCY_UDEV
, "udev" },
1178 { UNIT_DEPENDENCY_PATH
, "path" },
1179 { UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
, "mountinfo-implicit" },
1180 { UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
, "mountinfo-default" },
1181 { UNIT_DEPENDENCY_PROC_SWAP
, "proc-swap" },
1188 for (size_t i
= 0; i
< ELEMENTSOF(table
); i
++) {
1193 if (FLAGS_SET(mask
, table
[i
].mask
)) {
1201 fputs(table
[i
].name
, f
);
1203 mask
&= ~table
[i
].mask
;
1210 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
1212 const char *prefix2
;
1213 char timestamp
[5][FORMAT_TIMESTAMP_MAX
], timespan
[FORMAT_TIMESPAN_MAX
];
1215 _cleanup_set_free_ Set
*following_set
= NULL
;
1220 assert(u
->type
>= 0);
1222 prefix
= strempty(prefix
);
1223 prefix2
= strjoina(prefix
, "\t");
1229 SET_FOREACH(t
, u
->aliases
)
1230 fprintf(f
, "%s\tAlias: %s\n", prefix
, t
);
1233 "%s\tDescription: %s\n"
1234 "%s\tInstance: %s\n"
1235 "%s\tUnit Load State: %s\n"
1236 "%s\tUnit Active State: %s\n"
1237 "%s\tState Change Timestamp: %s\n"
1238 "%s\tInactive Exit Timestamp: %s\n"
1239 "%s\tActive Enter Timestamp: %s\n"
1240 "%s\tActive Exit Timestamp: %s\n"
1241 "%s\tInactive Enter Timestamp: %s\n"
1243 "%s\tNeed Daemon Reload: %s\n"
1244 "%s\tTransient: %s\n"
1245 "%s\tPerpetual: %s\n"
1246 "%s\tGarbage Collection Mode: %s\n"
1249 "%s\tCGroup realized: %s\n",
1250 prefix
, unit_description(u
),
1251 prefix
, strna(u
->instance
),
1252 prefix
, unit_load_state_to_string(u
->load_state
),
1253 prefix
, unit_active_state_to_string(unit_active_state(u
)),
1254 prefix
, strna(format_timestamp(timestamp
[0], sizeof(timestamp
[0]), u
->state_change_timestamp
.realtime
)),
1255 prefix
, strna(format_timestamp(timestamp
[1], sizeof(timestamp
[1]), u
->inactive_exit_timestamp
.realtime
)),
1256 prefix
, strna(format_timestamp(timestamp
[2], sizeof(timestamp
[2]), u
->active_enter_timestamp
.realtime
)),
1257 prefix
, strna(format_timestamp(timestamp
[3], sizeof(timestamp
[3]), u
->active_exit_timestamp
.realtime
)),
1258 prefix
, strna(format_timestamp(timestamp
[4], sizeof(timestamp
[4]), u
->inactive_enter_timestamp
.realtime
)),
1259 prefix
, yes_no(unit_may_gc(u
)),
1260 prefix
, yes_no(unit_need_daemon_reload(u
)),
1261 prefix
, yes_no(u
->transient
),
1262 prefix
, yes_no(u
->perpetual
),
1263 prefix
, collect_mode_to_string(u
->collect_mode
),
1264 prefix
, strna(unit_slice_name(u
)),
1265 prefix
, strna(u
->cgroup_path
),
1266 prefix
, yes_no(u
->cgroup_realized
));
1268 if (u
->cgroup_realized_mask
!= 0) {
1269 _cleanup_free_
char *s
= NULL
;
1270 (void) cg_mask_to_string(u
->cgroup_realized_mask
, &s
);
1271 fprintf(f
, "%s\tCGroup realized mask: %s\n", prefix
, strnull(s
));
1274 if (u
->cgroup_enabled_mask
!= 0) {
1275 _cleanup_free_
char *s
= NULL
;
1276 (void) cg_mask_to_string(u
->cgroup_enabled_mask
, &s
);
1277 fprintf(f
, "%s\tCGroup enabled mask: %s\n", prefix
, strnull(s
));
1280 m
= unit_get_own_mask(u
);
1282 _cleanup_free_
char *s
= NULL
;
1283 (void) cg_mask_to_string(m
, &s
);
1284 fprintf(f
, "%s\tCGroup own mask: %s\n", prefix
, strnull(s
));
1287 m
= unit_get_members_mask(u
);
1289 _cleanup_free_
char *s
= NULL
;
1290 (void) cg_mask_to_string(m
, &s
);
1291 fprintf(f
, "%s\tCGroup members mask: %s\n", prefix
, strnull(s
));
1294 m
= unit_get_delegate_mask(u
);
1296 _cleanup_free_
char *s
= NULL
;
1297 (void) cg_mask_to_string(m
, &s
);
1298 fprintf(f
, "%s\tCGroup delegate mask: %s\n", prefix
, strnull(s
));
1301 if (!sd_id128_is_null(u
->invocation_id
))
1302 fprintf(f
, "%s\tInvocation ID: " SD_ID128_FORMAT_STR
"\n",
1303 prefix
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
1305 STRV_FOREACH(j
, u
->documentation
)
1306 fprintf(f
, "%s\tDocumentation: %s\n", prefix
, *j
);
1308 following
= unit_following(u
);
1310 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->id
);
1312 r
= unit_following_set(u
, &following_set
);
1316 SET_FOREACH(other
, following_set
)
1317 fprintf(f
, "%s\tFollowing Set Member: %s\n", prefix
, other
->id
);
1320 if (u
->fragment_path
)
1321 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->fragment_path
);
1324 fprintf(f
, "%s\tSource Path: %s\n", prefix
, u
->source_path
);
1326 STRV_FOREACH(j
, u
->dropin_paths
)
1327 fprintf(f
, "%s\tDropIn Path: %s\n", prefix
, *j
);
1329 if (u
->failure_action
!= EMERGENCY_ACTION_NONE
)
1330 fprintf(f
, "%s\tFailure Action: %s\n", prefix
, emergency_action_to_string(u
->failure_action
));
1331 if (u
->failure_action_exit_status
>= 0)
1332 fprintf(f
, "%s\tFailure Action Exit Status: %i\n", prefix
, u
->failure_action_exit_status
);
1333 if (u
->success_action
!= EMERGENCY_ACTION_NONE
)
1334 fprintf(f
, "%s\tSuccess Action: %s\n", prefix
, emergency_action_to_string(u
->success_action
));
1335 if (u
->success_action_exit_status
>= 0)
1336 fprintf(f
, "%s\tSuccess Action Exit Status: %i\n", prefix
, u
->success_action_exit_status
);
1338 if (u
->job_timeout
!= USEC_INFINITY
)
1339 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->job_timeout
, 0));
1341 if (u
->job_timeout_action
!= EMERGENCY_ACTION_NONE
)
1342 fprintf(f
, "%s\tJob Timeout Action: %s\n", prefix
, emergency_action_to_string(u
->job_timeout_action
));
1344 if (u
->job_timeout_reboot_arg
)
1345 fprintf(f
, "%s\tJob Timeout Reboot Argument: %s\n", prefix
, u
->job_timeout_reboot_arg
);
1347 condition_dump_list(u
->conditions
, f
, prefix
, condition_type_to_string
);
1348 condition_dump_list(u
->asserts
, f
, prefix
, assert_type_to_string
);
1350 if (dual_timestamp_is_set(&u
->condition_timestamp
))
1352 "%s\tCondition Timestamp: %s\n"
1353 "%s\tCondition Result: %s\n",
1354 prefix
, strna(format_timestamp(timestamp
[0], sizeof(timestamp
[0]), u
->condition_timestamp
.realtime
)),
1355 prefix
, yes_no(u
->condition_result
));
1357 if (dual_timestamp_is_set(&u
->assert_timestamp
))
1359 "%s\tAssert Timestamp: %s\n"
1360 "%s\tAssert Result: %s\n",
1361 prefix
, strna(format_timestamp(timestamp
[0], sizeof(timestamp
[0]), u
->assert_timestamp
.realtime
)),
1362 prefix
, yes_no(u
->assert_result
));
1364 for (UnitDependency d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
1365 UnitDependencyInfo di
;
1368 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
]) {
1371 fprintf(f
, "%s\t%s: %s (", prefix
, unit_dependency_to_string(d
), other
->id
);
1373 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1374 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1380 if (!hashmap_isempty(u
->requires_mounts_for
)) {
1381 UnitDependencyInfo di
;
1384 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1387 fprintf(f
, "%s\tRequiresMountsFor: %s (", prefix
, path
);
1389 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1390 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1396 if (u
->load_state
== UNIT_LOADED
) {
1399 "%s\tStopWhenUnneeded: %s\n"
1400 "%s\tRefuseManualStart: %s\n"
1401 "%s\tRefuseManualStop: %s\n"
1402 "%s\tDefaultDependencies: %s\n"
1403 "%s\tOnFailureJobMode: %s\n"
1404 "%s\tIgnoreOnIsolate: %s\n",
1405 prefix
, yes_no(u
->stop_when_unneeded
),
1406 prefix
, yes_no(u
->refuse_manual_start
),
1407 prefix
, yes_no(u
->refuse_manual_stop
),
1408 prefix
, yes_no(u
->default_dependencies
),
1409 prefix
, job_mode_to_string(u
->on_failure_job_mode
),
1410 prefix
, yes_no(u
->ignore_on_isolate
));
1412 if (UNIT_VTABLE(u
)->dump
)
1413 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
1415 } else if (u
->load_state
== UNIT_MERGED
)
1417 "%s\tMerged into: %s\n",
1418 prefix
, u
->merged_into
->id
);
1419 else if (u
->load_state
== UNIT_ERROR
)
1420 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror_safe(u
->load_error
));
1422 for (const char *n
= sd_bus_track_first(u
->bus_track
); n
; n
= sd_bus_track_next(u
->bus_track
))
1423 fprintf(f
, "%s\tBus Ref: %s\n", prefix
, n
);
1426 job_dump(u
->job
, f
, prefix2
);
1429 job_dump(u
->nop_job
, f
, prefix2
);
1432 /* Common implementation for multiple backends */
1433 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1438 /* Load a .{service,socket,...} file */
1439 r
= unit_load_fragment(u
);
1443 if (u
->load_state
== UNIT_STUB
) {
1444 if (fragment_required
)
1447 u
->load_state
= UNIT_LOADED
;
1450 /* Load drop-in directory data. If u is an alias, we might be reloading the
1451 * target unit needlessly. But we cannot be sure which drops-ins have already
1452 * been loaded and which not, at least without doing complicated book-keeping,
1453 * so let's always reread all drop-ins. */
1454 r
= unit_load_dropin(unit_follow_merge(u
));
1458 if (u
->source_path
) {
1461 if (stat(u
->source_path
, &st
) >= 0)
1462 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1464 u
->source_mtime
= 0;
1470 void unit_add_to_target_deps_queue(Unit
*u
) {
1471 Manager
*m
= u
->manager
;
1475 if (u
->in_target_deps_queue
)
1478 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1479 u
->in_target_deps_queue
= true;
1482 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1486 if (target
->type
!= UNIT_TARGET
)
1489 /* Only add the dependency if both units are loaded, so that
1490 * that loop check below is reliable */
1491 if (u
->load_state
!= UNIT_LOADED
||
1492 target
->load_state
!= UNIT_LOADED
)
1495 /* If either side wants no automatic dependencies, then let's
1497 if (!u
->default_dependencies
||
1498 !target
->default_dependencies
)
1501 /* Don't create loops */
1502 if (hashmap_get(target
->dependencies
[UNIT_BEFORE
], u
))
1505 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1508 static int unit_add_slice_dependencies(Unit
*u
) {
1511 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1514 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1515 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1517 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1519 if (UNIT_ISSET(u
->slice
))
1520 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, UNIT_DEREF(u
->slice
), true, mask
);
1522 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1525 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1528 static int unit_add_mount_dependencies(Unit
*u
) {
1529 UnitDependencyInfo di
;
1535 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1536 char prefix
[strlen(path
) + 1];
1538 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1539 _cleanup_free_
char *p
= NULL
;
1542 r
= unit_name_from_path(prefix
, ".mount", &p
);
1546 m
= manager_get_unit(u
->manager
, p
);
1548 /* Make sure to load the mount unit if
1549 * it exists. If so the dependencies
1550 * on this unit will be added later
1551 * during the loading of the mount
1553 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1559 if (m
->load_state
!= UNIT_LOADED
)
1562 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1566 if (m
->fragment_path
) {
1567 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1577 static int unit_add_oomd_dependencies(Unit
*u
) {
1584 if (!u
->default_dependencies
)
1587 c
= unit_get_cgroup_context(u
);
1591 wants_oomd
= (c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
);
1595 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1602 static int unit_add_startup_units(Unit
*u
) {
1605 c
= unit_get_cgroup_context(u
);
1609 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1610 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1611 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1614 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1617 int unit_load(Unit
*u
) {
1622 if (u
->in_load_queue
) {
1623 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1624 u
->in_load_queue
= false;
1627 if (u
->type
== _UNIT_TYPE_INVALID
)
1630 if (u
->load_state
!= UNIT_STUB
)
1633 if (u
->transient_file
) {
1634 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1635 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1637 r
= fflush_and_check(u
->transient_file
);
1641 u
->transient_file
= safe_fclose(u
->transient_file
);
1642 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1645 r
= UNIT_VTABLE(u
)->load(u
);
1649 assert(u
->load_state
!= UNIT_STUB
);
1651 if (u
->load_state
== UNIT_LOADED
) {
1652 unit_add_to_target_deps_queue(u
);
1654 r
= unit_add_slice_dependencies(u
);
1658 r
= unit_add_mount_dependencies(u
);
1662 r
= unit_add_oomd_dependencies(u
);
1666 r
= unit_add_startup_units(u
);
1670 if (u
->on_failure_job_mode
== JOB_ISOLATE
&& hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) > 1) {
1671 r
= log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
),
1672 "More than one OnFailure= dependencies specified but OnFailureJobMode=isolate set. Refusing.");
1676 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1677 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1679 /* We finished loading, let's ensure our parents recalculate the members mask */
1680 unit_invalidate_cgroup_members_masks(u
);
1683 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1685 unit_add_to_dbus_queue(unit_follow_merge(u
));
1686 unit_add_to_gc_queue(u
);
1687 (void) manager_varlink_send_managed_oom_update(u
);
1692 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1693 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1695 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1696 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1700 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1701 * an attempt is made to load this unit, we know we need to check again. */
1702 if (u
->load_state
== UNIT_NOT_FOUND
)
1703 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1705 unit_add_to_dbus_queue(u
);
1706 unit_add_to_gc_queue(u
);
1708 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1712 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1717 va_start(ap
, format
);
1719 r
= log_object_internalv(level
, error
, file
, line
, func
,
1720 u
->manager
->unit_log_field
,
1722 u
->manager
->invocation_log_field
,
1723 u
->invocation_id_string
,
1726 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1732 static bool unit_test_condition(Unit
*u
) {
1733 _cleanup_strv_free_
char **env
= NULL
;
1738 dual_timestamp_get(&u
->condition_timestamp
);
1740 r
= manager_get_effective_environment(u
->manager
, &env
);
1742 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1743 u
->condition_result
= CONDITION_ERROR
;
1745 u
->condition_result
= condition_test_list(
1748 condition_type_to_string
,
1752 unit_add_to_dbus_queue(u
);
1753 return u
->condition_result
;
1756 static bool unit_test_assert(Unit
*u
) {
1757 _cleanup_strv_free_
char **env
= NULL
;
1762 dual_timestamp_get(&u
->assert_timestamp
);
1764 r
= manager_get_effective_environment(u
->manager
, &env
);
1766 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1767 u
->assert_result
= CONDITION_ERROR
;
1769 u
->assert_result
= condition_test_list(
1772 assert_type_to_string
,
1776 unit_add_to_dbus_queue(u
);
1777 return u
->assert_result
;
1780 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *unit_status_msg_format
) {
1783 d
= unit_status_string(u
);
1784 if (log_get_show_color())
1785 d
= strjoina(ANSI_HIGHLIGHT
, d
, ANSI_NORMAL
);
1787 DISABLE_WARNING_FORMAT_NONLITERAL
;
1788 manager_status_printf(u
->manager
, status_type
, status
, unit_status_msg_format
, d
);
1792 int unit_test_start_limit(Unit
*u
) {
1797 if (ratelimit_below(&u
->start_ratelimit
)) {
1798 u
->start_limit_hit
= false;
1802 log_unit_warning(u
, "Start request repeated too quickly.");
1803 u
->start_limit_hit
= true;
1805 reason
= strjoina("unit ", u
->id
, " failed");
1807 emergency_action(u
->manager
, u
->start_limit_action
,
1808 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1809 u
->reboot_arg
, -1, reason
);
1814 bool unit_shall_confirm_spawn(Unit
*u
) {
1817 if (manager_is_confirm_spawn_disabled(u
->manager
))
1820 /* For some reasons units remaining in the same process group
1821 * as PID 1 fail to acquire the console even if it's not used
1822 * by any process. So skip the confirmation question for them. */
1823 return !unit_get_exec_context(u
)->same_pgrp
;
1826 static bool unit_verify_deps(Unit
*u
) {
1832 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined with
1833 * After=. We do not check Requires= or Requisite= here as they only should have an effect on the job
1834 * processing, but do not have any effect afterwards. We don't check BindsTo= dependencies that are not used in
1835 * conjunction with After= as for them any such check would make things entirely racy. */
1837 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
]) {
1839 if (!hashmap_contains(u
->dependencies
[UNIT_AFTER
], other
))
1842 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1843 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1851 /* Errors that aren't really errors:
1852 * -EALREADY: Unit is already started.
1853 * -ECOMM: Condition failed
1854 * -EAGAIN: An operation is already in progress. Retry later.
1856 * Errors that are real errors:
1857 * -EBADR: This unit type does not support starting.
1858 * -ECANCELED: Start limit hit, too many requests for now
1859 * -EPROTO: Assert failed
1860 * -EINVAL: Unit not loaded
1861 * -EOPNOTSUPP: Unit type not supported
1862 * -ENOLINK: The necessary dependencies are not fulfilled.
1863 * -ESTALE: This unit has been started before and can't be started a second time
1864 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1866 int unit_start(Unit
*u
) {
1867 UnitActiveState state
;
1872 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1873 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1874 * waiting is finished. */
1875 state
= unit_active_state(u
);
1876 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1878 if (state
== UNIT_MAINTENANCE
)
1881 /* Units that aren't loaded cannot be started */
1882 if (u
->load_state
!= UNIT_LOADED
)
1885 /* Refuse starting scope units more than once */
1886 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1889 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1890 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1891 * recheck the condition in that case. */
1892 if (state
!= UNIT_ACTIVATING
&&
1893 !unit_test_condition(u
))
1894 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1896 /* If the asserts failed, fail the entire job */
1897 if (state
!= UNIT_ACTIVATING
&&
1898 !unit_test_assert(u
))
1899 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1901 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1902 * condition checks, so that we rather return condition check errors (which are usually not
1903 * considered a true failure) than "not supported" errors (which are considered a failure).
1905 if (!unit_type_supported(u
->type
))
1908 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1909 * should have taken care of this already, but let's check this here again. After all, our
1910 * dependencies might not be in effect anymore, due to a reload or due to a failed condition. */
1911 if (!unit_verify_deps(u
))
1914 /* Forward to the main object, if we aren't it. */
1915 following
= unit_following(u
);
1917 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1918 return unit_start(following
);
1921 /* If it is stopped, but we cannot start it, then fail */
1922 if (!UNIT_VTABLE(u
)->start
)
1925 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1926 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1927 * waits for a holdoff timer to elapse before it will start again. */
1929 unit_add_to_dbus_queue(u
);
1930 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1932 return UNIT_VTABLE(u
)->start(u
);
1935 bool unit_can_start(Unit
*u
) {
1938 if (u
->load_state
!= UNIT_LOADED
)
1941 if (!unit_type_supported(u
->type
))
1944 /* Scope units may be started only once */
1945 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1948 return !!UNIT_VTABLE(u
)->start
;
1951 bool unit_can_isolate(Unit
*u
) {
1954 return unit_can_start(u
) &&
1959 * -EBADR: This unit type does not support stopping.
1960 * -EALREADY: Unit is already stopped.
1961 * -EAGAIN: An operation is already in progress. Retry later.
1963 int unit_stop(Unit
*u
) {
1964 UnitActiveState state
;
1969 state
= unit_active_state(u
);
1970 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1973 following
= unit_following(u
);
1975 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1976 return unit_stop(following
);
1979 if (!UNIT_VTABLE(u
)->stop
)
1982 unit_add_to_dbus_queue(u
);
1983 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1985 return UNIT_VTABLE(u
)->stop(u
);
1988 bool unit_can_stop(Unit
*u
) {
1991 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
1992 * Extrinsic units follow external state and they may stop following external state changes
1993 * (hence we return true here), but an attempt to do this through the manager will fail. */
1995 if (!unit_type_supported(u
->type
))
2001 return !!UNIT_VTABLE(u
)->stop
;
2005 * -EBADR: This unit type does not support reloading.
2006 * -ENOEXEC: Unit is not started.
2007 * -EAGAIN: An operation is already in progress. Retry later.
2009 int unit_reload(Unit
*u
) {
2010 UnitActiveState state
;
2015 if (u
->load_state
!= UNIT_LOADED
)
2018 if (!unit_can_reload(u
))
2021 state
= unit_active_state(u
);
2022 if (state
== UNIT_RELOADING
)
2025 if (state
!= UNIT_ACTIVE
)
2026 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2028 following
= unit_following(u
);
2030 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2031 return unit_reload(following
);
2034 unit_add_to_dbus_queue(u
);
2036 if (!UNIT_VTABLE(u
)->reload
) {
2037 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2038 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
2042 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2044 return UNIT_VTABLE(u
)->reload(u
);
2047 bool unit_can_reload(Unit
*u
) {
2050 if (UNIT_VTABLE(u
)->can_reload
)
2051 return UNIT_VTABLE(u
)->can_reload(u
);
2053 if (!hashmap_isempty(u
->dependencies
[UNIT_PROPAGATES_RELOAD_TO
]))
2056 return UNIT_VTABLE(u
)->reload
;
2059 bool unit_is_unneeded(Unit
*u
) {
2060 static const UnitDependency deps
[] = {
2069 if (!u
->stop_when_unneeded
)
2072 /* Don't clean up while the unit is transitioning or is even inactive. */
2073 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
2078 for (size_t j
= 0; j
< ELEMENTSOF(deps
); j
++) {
2082 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2083 * restart, then don't clean this one up. */
2085 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[deps
[j
]]) {
2089 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2092 if (unit_will_restart(other
))
2100 static void check_unneeded_dependencies(Unit
*u
) {
2102 static const UnitDependency deps
[] = {
2111 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2113 for (size_t j
= 0; j
< ELEMENTSOF(deps
); j
++) {
2117 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[deps
[j
]])
2118 unit_submit_to_stop_when_unneeded_queue(other
);
2122 static void unit_check_binds_to(Unit
*u
) {
2123 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2134 if (unit_active_state(u
) != UNIT_ACTIVE
)
2137 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
]) {
2141 if (!other
->coldplugged
)
2142 /* We might yet create a job for the other unit… */
2145 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2155 /* If stopping a unit fails continuously we might enter a stop
2156 * loop here, hence stop acting on the service being
2157 * unnecessary after a while. */
2158 if (!ratelimit_below(&u
->auto_stop_ratelimit
)) {
2159 log_unit_warning(u
, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other
->id
);
2164 log_unit_info(u
, "Unit is bound to inactive unit %s. Stopping, too.", other
->id
);
2166 /* A unit we need to run is gone. Sniff. Let's stop this. */
2167 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, NULL
, &error
, NULL
);
2169 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2172 static void retroactively_start_dependencies(Unit
*u
) {
2177 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2179 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
])
2180 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2181 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2182 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2184 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
])
2185 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2186 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2187 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2189 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
])
2190 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2191 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2192 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2194 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTS
])
2195 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2196 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2198 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTED_BY
])
2199 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2200 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2203 static void retroactively_stop_dependencies(Unit
*u
) {
2208 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2210 /* Pull down units which are bound to us recursively if enabled */
2211 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BOUND_BY
])
2212 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2213 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2216 void unit_start_on_failure(Unit
*u
) {
2223 if (hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
2226 log_unit_info(u
, "Triggering OnFailure= dependencies.");
2228 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_ON_FAILURE
]) {
2229 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2231 r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_job_mode
, NULL
, &error
, NULL
);
2233 log_unit_warning_errno(u
, r
, "Failed to enqueue OnFailure= job, ignoring: %s", bus_error_message(&error
, r
));
2237 void unit_trigger_notify(Unit
*u
) {
2243 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_TRIGGERED_BY
])
2244 if (UNIT_VTABLE(other
)->trigger_notify
)
2245 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2248 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2249 if (condition_notice
&& log_level
> LOG_NOTICE
)
2251 if (condition_info
&& log_level
> LOG_INFO
)
2256 static int unit_log_resources(Unit
*u
) {
2257 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2258 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2259 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2260 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2261 size_t n_message_parts
= 0, n_iovec
= 0;
2262 char* message_parts
[1 + 2 + 2 + 1], *t
;
2263 nsec_t nsec
= NSEC_INFINITY
;
2265 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2266 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2267 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2268 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2269 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2271 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2272 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2273 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2274 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2275 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2280 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2281 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2282 * information and the complete data in structured fields. */
2284 (void) unit_get_cpu_usage(u
, &nsec
);
2285 if (nsec
!= NSEC_INFINITY
) {
2286 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2288 /* Format the CPU time for inclusion in the structured log message */
2289 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2293 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2295 /* Format the CPU time for inclusion in the human language message string */
2296 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2297 t
= strjoin("consumed ", buf
, " CPU time");
2303 message_parts
[n_message_parts
++] = t
;
2305 log_level
= raise_level(log_level
,
2306 nsec
> NOTICEWORTHY_CPU_NSEC
,
2307 nsec
> MENTIONWORTHY_CPU_NSEC
);
2310 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2311 char buf
[FORMAT_BYTES_MAX
] = "";
2312 uint64_t value
= UINT64_MAX
;
2314 assert(io_fields
[k
]);
2316 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2317 if (value
== UINT64_MAX
)
2320 have_io_accounting
= true;
2324 /* Format IO accounting data for inclusion in the structured log message */
2325 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2329 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2331 /* Format the IO accounting data for inclusion in the human language message string, but only
2332 * for the bytes counters (and not for the operations counters) */
2333 if (k
== CGROUP_IO_READ_BYTES
) {
2335 rr
= strjoin("read ", format_bytes(buf
, sizeof(buf
), value
), " from disk");
2340 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2342 wr
= strjoin("written ", format_bytes(buf
, sizeof(buf
), value
), " to disk");
2349 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2350 log_level
= raise_level(log_level
,
2351 value
> MENTIONWORTHY_IO_BYTES
,
2352 value
> NOTICEWORTHY_IO_BYTES
);
2355 if (have_io_accounting
) {
2358 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2360 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2365 k
= strdup("no IO");
2371 message_parts
[n_message_parts
++] = k
;
2375 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2376 char buf
[FORMAT_BYTES_MAX
] = "";
2377 uint64_t value
= UINT64_MAX
;
2379 assert(ip_fields
[m
]);
2381 (void) unit_get_ip_accounting(u
, m
, &value
);
2382 if (value
== UINT64_MAX
)
2385 have_ip_accounting
= true;
2389 /* Format IP accounting data for inclusion in the structured log message */
2390 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2394 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2396 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2397 * bytes counters (and not for the packets counters) */
2398 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2400 igress
= strjoin("received ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2405 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2407 egress
= strjoin("sent ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2414 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2415 log_level
= raise_level(log_level
,
2416 value
> MENTIONWORTHY_IP_BYTES
,
2417 value
> NOTICEWORTHY_IP_BYTES
);
2420 if (have_ip_accounting
) {
2423 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2425 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2430 k
= strdup("no IP traffic");
2436 message_parts
[n_message_parts
++] = k
;
2440 /* Is there any accounting data available at all? */
2446 if (n_message_parts
== 0)
2447 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2449 _cleanup_free_
char *joined
;
2451 message_parts
[n_message_parts
] = NULL
;
2453 joined
= strv_join(message_parts
, ", ");
2459 joined
[0] = ascii_toupper(joined
[0]);
2460 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2463 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2464 * and hence don't increase n_iovec for them */
2465 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2466 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2468 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2469 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2471 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2472 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2474 log_struct_iovec(log_level
, iovec
, n_iovec
+ 4);
2478 for (size_t i
= 0; i
< n_message_parts
; i
++)
2479 free(message_parts
[i
]);
2481 for (size_t i
= 0; i
< n_iovec
; i
++)
2482 free(iovec
[i
].iov_base
);
2488 static void unit_update_on_console(Unit
*u
) {
2493 b
= unit_needs_console(u
);
2494 if (u
->on_console
== b
)
2499 manager_ref_console(u
->manager
);
2501 manager_unref_console(u
->manager
);
2504 static void unit_emit_audit_start(Unit
*u
) {
2507 if (u
->type
!= UNIT_SERVICE
)
2510 /* Write audit record if we have just finished starting up */
2511 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2515 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2518 if (u
->type
!= UNIT_SERVICE
)
2522 /* Write audit record if we have just finished shutting down */
2523 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2524 u
->in_audit
= false;
2526 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2527 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2529 if (state
== UNIT_INACTIVE
)
2530 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2534 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2535 bool unexpected
= false;
2540 if (j
->state
== JOB_WAITING
)
2542 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2544 job_add_to_run_queue(j
);
2546 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2547 * hence needs to invalidate jobs. */
2552 case JOB_VERIFY_ACTIVE
:
2554 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2555 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2556 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2559 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2560 if (ns
== UNIT_FAILED
)
2561 result
= JOB_FAILED
;
2565 job_finish_and_invalidate(j
, result
, true, false);
2572 case JOB_RELOAD_OR_START
:
2573 case JOB_TRY_RELOAD
:
2575 if (j
->state
== JOB_RUNNING
) {
2576 if (ns
== UNIT_ACTIVE
)
2577 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2578 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2581 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2582 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2590 case JOB_TRY_RESTART
:
2592 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2593 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2594 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2596 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2602 assert_not_reached("Job type unknown");
2608 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2613 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2614 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2616 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2617 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2618 * remounted this function will be called too! */
2622 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2623 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2624 unit_add_to_dbus_queue(u
);
2626 /* Update systemd-oomd on the property/state change */
2628 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2630 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2631 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2632 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2633 * have the information on the property. Thus, indiscriminately send an update. */
2634 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2635 (void) manager_varlink_send_managed_oom_update(u
);
2638 /* Update timestamps for state changes */
2639 if (!MANAGER_IS_RELOADING(m
)) {
2640 dual_timestamp_get(&u
->state_change_timestamp
);
2642 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2643 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2644 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2645 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2647 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2648 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2649 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2650 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2653 /* Keep track of failed units */
2654 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2656 /* Make sure the cgroup and state files are always removed when we become inactive */
2657 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2658 unit_prune_cgroup(u
);
2659 unit_unlink_state_files(u
);
2662 unit_update_on_console(u
);
2664 if (!MANAGER_IS_RELOADING(m
)) {
2667 /* Let's propagate state changes to the job */
2669 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2673 /* If this state change happened without being requested by a job, then let's retroactively start or
2674 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2675 * additional jobs just because something is already activated. */
2678 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2679 retroactively_start_dependencies(u
);
2680 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2681 retroactively_stop_dependencies(u
);
2684 /* stop unneeded units regardless if going down was expected or not */
2685 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2686 check_unneeded_dependencies(u
);
2688 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2689 log_unit_debug(u
, "Unit entered failed state.");
2691 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2692 unit_start_on_failure(u
);
2695 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2696 /* This unit just finished starting up */
2698 unit_emit_audit_start(u
);
2699 manager_send_unit_plymouth(m
, u
);
2702 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2703 /* This unit just stopped/failed. */
2705 unit_emit_audit_stop(u
, ns
);
2706 unit_log_resources(u
);
2710 manager_recheck_journal(m
);
2711 manager_recheck_dbus(m
);
2713 unit_trigger_notify(u
);
2715 if (!MANAGER_IS_RELOADING(m
)) {
2716 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2717 unit_submit_to_stop_when_unneeded_queue(u
);
2719 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens when
2720 * something BindsTo= to a Type=oneshot unit, as these units go directly from starting to inactive,
2721 * without ever entering started.) */
2722 unit_check_binds_to(u
);
2724 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2725 reason
= strjoina("unit ", u
->id
, " failed");
2726 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2727 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2728 reason
= strjoina("unit ", u
->id
, " succeeded");
2729 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2733 unit_add_to_gc_queue(u
);
2736 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2740 assert(pid_is_valid(pid
));
2742 /* Watch a specific PID */
2744 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2745 * opportunity to remove any stalled references to this PID as they can be created
2746 * easily (when watching a process which is not our direct child). */
2748 manager_unwatch_pid(u
->manager
, pid
);
2750 r
= set_ensure_allocated(&u
->pids
, NULL
);
2754 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2758 /* First try, let's add the unit keyed by "pid". */
2759 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2765 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2766 * to an array of Units rather than just a Unit), lists us already. */
2768 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2770 for (; array
[n
]; n
++)
2774 if (found
) /* Found it already? if so, do nothing */
2779 /* Allocate a new array */
2780 new_array
= new(Unit
*, n
+ 2);
2784 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2786 new_array
[n
+1] = NULL
;
2788 /* Add or replace the old array */
2789 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2800 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2807 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2811 assert(pid_is_valid(pid
));
2813 /* First let's drop the unit in case it's keyed as "pid". */
2814 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2816 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2817 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2819 /* Let's iterate through the array, dropping our own entry */
2822 for (size_t n
= 0; array
[n
]; n
++)
2824 array
[m
++] = array
[n
];
2828 /* The array is now empty, remove the entire entry */
2829 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2834 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2837 void unit_unwatch_all_pids(Unit
*u
) {
2840 while (!set_isempty(u
->pids
))
2841 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2843 u
->pids
= set_free(u
->pids
);
2846 static void unit_tidy_watch_pids(Unit
*u
) {
2847 pid_t except1
, except2
;
2852 /* Cleans dead PIDs from our list */
2854 except1
= unit_main_pid(u
);
2855 except2
= unit_control_pid(u
);
2857 SET_FOREACH(e
, u
->pids
) {
2858 pid_t pid
= PTR_TO_PID(e
);
2860 if (pid
== except1
|| pid
== except2
)
2863 if (!pid_is_unwaited(pid
))
2864 unit_unwatch_pid(u
, pid
);
2868 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2874 unit_tidy_watch_pids(u
);
2875 unit_watch_all_pids(u
);
2877 /* If the PID set is empty now, then let's finish this off. */
2878 unit_synthesize_cgroup_empty_event(u
);
2883 int unit_enqueue_rewatch_pids(Unit
*u
) {
2888 if (!u
->cgroup_path
)
2891 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2894 if (r
> 0) /* On unified we can use proper notifications */
2897 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2898 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2899 * involves issuing kill(pid, 0) on all processes we watch. */
2901 if (!u
->rewatch_pids_event_source
) {
2902 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2904 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2906 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2908 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2910 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2912 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2914 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2917 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2919 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2924 void unit_dequeue_rewatch_pids(Unit
*u
) {
2928 if (!u
->rewatch_pids_event_source
)
2931 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2933 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2935 u
->rewatch_pids_event_source
= sd_event_source_unref(u
->rewatch_pids_event_source
);
2938 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2940 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2944 case JOB_VERIFY_ACTIVE
:
2947 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2948 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
2953 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2954 * external events), hence it makes no sense to permit enqueuing such a request either. */
2955 return !u
->perpetual
;
2958 case JOB_TRY_RESTART
:
2959 return unit_can_stop(u
) && unit_can_start(u
);
2962 case JOB_TRY_RELOAD
:
2963 return unit_can_reload(u
);
2965 case JOB_RELOAD_OR_START
:
2966 return unit_can_reload(u
) && unit_can_start(u
);
2969 assert_not_reached("Invalid job type");
2973 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
) {
2976 /* Only warn about some unit types */
2977 if (!IN_SET(dependency
, UNIT_CONFLICTS
, UNIT_CONFLICTED_BY
, UNIT_BEFORE
, UNIT_AFTER
, UNIT_ON_FAILURE
, UNIT_TRIGGERS
, UNIT_TRIGGERED_BY
))
2980 if (streq_ptr(u
->id
, other
))
2981 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
2983 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other
), u
->id
);
2986 static int unit_add_dependency_hashmap(
2989 UnitDependencyMask origin_mask
,
2990 UnitDependencyMask destination_mask
) {
2992 UnitDependencyInfo info
;
2997 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2998 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2999 assert(origin_mask
> 0 || destination_mask
> 0);
3001 r
= hashmap_ensure_allocated(h
, NULL
);
3005 assert_cc(sizeof(void*) == sizeof(info
));
3007 info
.data
= hashmap_get(*h
, other
);
3009 /* Entry already exists. Add in our mask. */
3011 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
3012 FLAGS_SET(destination_mask
, info
.destination_mask
))
3015 info
.origin_mask
|= origin_mask
;
3016 info
.destination_mask
|= destination_mask
;
3018 r
= hashmap_update(*h
, other
, info
.data
);
3020 info
= (UnitDependencyInfo
) {
3021 .origin_mask
= origin_mask
,
3022 .destination_mask
= destination_mask
,
3025 r
= hashmap_put(*h
, other
, info
.data
);
3033 int unit_add_dependency(
3038 UnitDependencyMask mask
) {
3040 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3041 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3042 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3043 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3044 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3045 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3046 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3047 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3048 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3049 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3050 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3051 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3052 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3053 [UNIT_BEFORE
] = UNIT_AFTER
,
3054 [UNIT_AFTER
] = UNIT_BEFORE
,
3055 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
3056 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3057 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3058 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3059 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3060 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3061 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3062 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
,
3064 Unit
*original_u
= u
, *original_other
= other
;
3066 /* Helper to know whether sending a notification is necessary or not:
3067 * if the dependency is already there, no need to notify! */
3071 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3074 u
= unit_follow_merge(u
);
3075 other
= unit_follow_merge(other
);
3077 /* We won't allow dependencies on ourselves. We will not
3078 * consider them an error however. */
3080 maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
3084 /* Note that ordering a device unit after a unit is permitted since it
3085 * allows to start its job running timeout at a specific time. */
3086 if (d
== UNIT_BEFORE
&& other
->type
== UNIT_DEVICE
) {
3087 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3091 if (d
== UNIT_ON_FAILURE
&& !UNIT_VTABLE(u
)->can_fail
) {
3092 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3096 if (d
== UNIT_TRIGGERS
&& !UNIT_VTABLE(u
)->can_trigger
)
3097 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3098 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3099 if (d
== UNIT_TRIGGERED_BY
&& !UNIT_VTABLE(other
)->can_trigger
)
3100 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3101 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3103 r
= unit_add_dependency_hashmap(u
->dependencies
+ d
, other
, mask
, 0);
3109 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3110 r
= unit_add_dependency_hashmap(other
->dependencies
+ inverse_table
[d
], u
, 0, mask
);
3117 if (add_reference
) {
3118 r
= unit_add_dependency_hashmap(u
->dependencies
+ UNIT_REFERENCES
, other
, mask
, 0);
3124 r
= unit_add_dependency_hashmap(other
->dependencies
+ UNIT_REFERENCED_BY
, u
, 0, mask
);
3132 unit_add_to_dbus_queue(u
);
3136 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3141 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3145 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3148 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3156 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3163 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3165 _cleanup_free_
char *i
= NULL
;
3167 r
= unit_name_to_prefix(u
->id
, &i
);
3171 r
= unit_name_replace_instance(name
, i
, buf
);
3180 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3181 _cleanup_free_
char *buf
= NULL
;
3188 r
= resolve_template(u
, name
, &buf
, &name
);
3192 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3196 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3199 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3200 _cleanup_free_
char *buf
= NULL
;
3207 r
= resolve_template(u
, name
, &buf
, &name
);
3211 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3215 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3218 int set_unit_path(const char *p
) {
3219 /* This is mostly for debug purposes */
3220 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
3226 char *unit_dbus_path(Unit
*u
) {
3232 return unit_dbus_path_from_name(u
->id
);
3235 char *unit_dbus_path_invocation_id(Unit
*u
) {
3238 if (sd_id128_is_null(u
->invocation_id
))
3241 return unit_dbus_path_from_name(u
->invocation_id_string
);
3244 static int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3249 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3251 if (sd_id128_equal(u
->invocation_id
, id
))
3254 if (!sd_id128_is_null(u
->invocation_id
))
3255 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3257 if (sd_id128_is_null(id
)) {
3262 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3266 u
->invocation_id
= id
;
3267 sd_id128_to_string(id
, u
->invocation_id_string
);
3269 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3276 u
->invocation_id
= SD_ID128_NULL
;
3277 u
->invocation_id_string
[0] = 0;
3281 int unit_set_slice(Unit
*u
, Unit
*slice
) {
3285 /* Sets the unit slice if it has not been set before. Is extra
3286 * careful, to only allow this for units that actually have a
3287 * cgroup context. Also, we don't allow to set this for slices
3288 * (since the parent slice is derived from the name). Make
3289 * sure the unit we set is actually a slice. */
3291 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3294 if (u
->type
== UNIT_SLICE
)
3297 if (unit_active_state(u
) != UNIT_INACTIVE
)
3300 if (slice
->type
!= UNIT_SLICE
)
3303 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3304 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3307 if (UNIT_DEREF(u
->slice
) == slice
)
3310 /* Disallow slice changes if @u is already bound to cgroups */
3311 if (UNIT_ISSET(u
->slice
) && u
->cgroup_realized
)
3314 unit_ref_set(&u
->slice
, u
, slice
);
3318 int unit_set_default_slice(Unit
*u
) {
3319 const char *slice_name
;
3325 if (UNIT_ISSET(u
->slice
))
3329 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3331 /* Implicitly place all instantiated units in their
3332 * own per-template slice */
3334 r
= unit_name_to_prefix(u
->id
, &prefix
);
3338 /* The prefix is already escaped, but it might include
3339 * "-" which has a special meaning for slice units,
3340 * hence escape it here extra. */
3341 escaped
= unit_name_escape(prefix
);
3345 if (MANAGER_IS_SYSTEM(u
->manager
))
3346 slice_name
= strjoina("system-", escaped
, ".slice");
3348 slice_name
= strjoina("app-", escaped
, ".slice");
3350 } else if (unit_is_extrinsic(u
))
3351 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3352 * the root slice. They don't really belong in one of the subslices. */
3353 slice_name
= SPECIAL_ROOT_SLICE
;
3355 else if (MANAGER_IS_SYSTEM(u
->manager
))
3356 slice_name
= SPECIAL_SYSTEM_SLICE
;
3358 slice_name
= SPECIAL_APP_SLICE
;
3360 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3364 return unit_set_slice(u
, slice
);
3367 const char *unit_slice_name(Unit
*u
) {
3370 if (!UNIT_ISSET(u
->slice
))
3373 return UNIT_DEREF(u
->slice
)->id
;
3376 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3377 _cleanup_free_
char *t
= NULL
;
3384 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3387 if (unit_has_name(u
, t
))
3390 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3391 assert(r
< 0 || *_found
!= u
);
3395 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3396 const char *new_owner
;
3403 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3405 bus_log_parse_error(r
);
3409 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3410 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3415 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3416 const sd_bus_error
*e
;
3417 const char *new_owner
;
3424 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3426 e
= sd_bus_message_get_error(message
);
3428 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner"))
3429 log_unit_error(u
, "Unexpected error response from GetNameOwner(): %s", e
->message
);
3433 r
= sd_bus_message_read(message
, "s", &new_owner
);
3435 return bus_log_parse_error(r
);
3437 assert(!isempty(new_owner
));
3440 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3441 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3446 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3454 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3457 match
= strjoina("type='signal',"
3458 "sender='org.freedesktop.DBus',"
3459 "path='/org/freedesktop/DBus',"
3460 "interface='org.freedesktop.DBus',"
3461 "member='NameOwnerChanged',"
3462 "arg0='", name
, "'");
3464 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3468 r
= sd_bus_call_method_async(
3470 &u
->get_name_owner_slot
,
3471 "org.freedesktop.DBus",
3472 "/org/freedesktop/DBus",
3473 "org.freedesktop.DBus",
3475 get_name_owner_handler
,
3479 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3483 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3487 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3493 /* Watch a specific name on the bus. We only support one unit
3494 * watching each name for now. */
3496 if (u
->manager
->api_bus
) {
3497 /* If the bus is already available, install the match directly.
3498 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3499 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3501 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3504 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3506 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3507 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3508 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3514 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3518 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3519 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3520 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3523 bool unit_can_serialize(Unit
*u
) {
3526 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
3529 static int serialize_cgroup_mask(FILE *f
, const char *key
, CGroupMask mask
) {
3530 _cleanup_free_
char *s
= NULL
;
3539 r
= cg_mask_to_string(mask
, &s
);
3541 return log_error_errno(r
, "Failed to format cgroup mask: %m");
3543 return serialize_item(f
, key
, s
);
3546 static const char *const ip_accounting_metric_field
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
3547 [CGROUP_IP_INGRESS_BYTES
] = "ip-accounting-ingress-bytes",
3548 [CGROUP_IP_INGRESS_PACKETS
] = "ip-accounting-ingress-packets",
3549 [CGROUP_IP_EGRESS_BYTES
] = "ip-accounting-egress-bytes",
3550 [CGROUP_IP_EGRESS_PACKETS
] = "ip-accounting-egress-packets",
3553 static const char *const io_accounting_metric_field_base
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
3554 [CGROUP_IO_READ_BYTES
] = "io-accounting-read-bytes-base",
3555 [CGROUP_IO_WRITE_BYTES
] = "io-accounting-write-bytes-base",
3556 [CGROUP_IO_READ_OPERATIONS
] = "io-accounting-read-operations-base",
3557 [CGROUP_IO_WRITE_OPERATIONS
] = "io-accounting-write-operations-base",
3560 static const char *const io_accounting_metric_field_last
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
3561 [CGROUP_IO_READ_BYTES
] = "io-accounting-read-bytes-last",
3562 [CGROUP_IO_WRITE_BYTES
] = "io-accounting-write-bytes-last",
3563 [CGROUP_IO_READ_OPERATIONS
] = "io-accounting-read-operations-last",
3564 [CGROUP_IO_WRITE_OPERATIONS
] = "io-accounting-write-operations-last",
3567 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
, bool serialize_jobs
) {
3574 if (unit_can_serialize(u
)) {
3575 r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
);
3580 (void) serialize_dual_timestamp(f
, "state-change-timestamp", &u
->state_change_timestamp
);
3582 (void) serialize_dual_timestamp(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
3583 (void) serialize_dual_timestamp(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
3584 (void) serialize_dual_timestamp(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
3585 (void) serialize_dual_timestamp(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
3587 (void) serialize_dual_timestamp(f
, "condition-timestamp", &u
->condition_timestamp
);
3588 (void) serialize_dual_timestamp(f
, "assert-timestamp", &u
->assert_timestamp
);
3590 if (dual_timestamp_is_set(&u
->condition_timestamp
))
3591 (void) serialize_bool(f
, "condition-result", u
->condition_result
);
3593 if (dual_timestamp_is_set(&u
->assert_timestamp
))
3594 (void) serialize_bool(f
, "assert-result", u
->assert_result
);
3596 (void) serialize_bool(f
, "transient", u
->transient
);
3597 (void) serialize_bool(f
, "in-audit", u
->in_audit
);
3599 (void) serialize_bool(f
, "exported-invocation-id", u
->exported_invocation_id
);
3600 (void) serialize_bool(f
, "exported-log-level-max", u
->exported_log_level_max
);
3601 (void) serialize_bool(f
, "exported-log-extra-fields", u
->exported_log_extra_fields
);
3602 (void) serialize_bool(f
, "exported-log-rate-limit-interval", u
->exported_log_ratelimit_interval
);
3603 (void) serialize_bool(f
, "exported-log-rate-limit-burst", u
->exported_log_ratelimit_burst
);
3605 (void) serialize_item_format(f
, "cpu-usage-base", "%" PRIu64
, u
->cpu_usage_base
);
3606 if (u
->cpu_usage_last
!= NSEC_INFINITY
)
3607 (void) serialize_item_format(f
, "cpu-usage-last", "%" PRIu64
, u
->cpu_usage_last
);
3609 if (u
->managed_oom_kill_last
> 0)
3610 (void) serialize_item_format(f
, "managed-oom-kill-last", "%" PRIu64
, u
->managed_oom_kill_last
);
3612 if (u
->oom_kill_last
> 0)
3613 (void) serialize_item_format(f
, "oom-kill-last", "%" PRIu64
, u
->oom_kill_last
);
3615 for (CGroupIOAccountingMetric im
= 0; im
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; im
++) {
3616 (void) serialize_item_format(f
, io_accounting_metric_field_base
[im
], "%" PRIu64
, u
->io_accounting_base
[im
]);
3618 if (u
->io_accounting_last
[im
] != UINT64_MAX
)
3619 (void) serialize_item_format(f
, io_accounting_metric_field_last
[im
], "%" PRIu64
, u
->io_accounting_last
[im
]);
3623 (void) serialize_item(f
, "cgroup", u
->cgroup_path
);
3625 (void) serialize_bool(f
, "cgroup-realized", u
->cgroup_realized
);
3626 (void) serialize_cgroup_mask(f
, "cgroup-realized-mask", u
->cgroup_realized_mask
);
3627 (void) serialize_cgroup_mask(f
, "cgroup-enabled-mask", u
->cgroup_enabled_mask
);
3628 (void) serialize_cgroup_mask(f
, "cgroup-invalidated-mask", u
->cgroup_invalidated_mask
);
3630 if (uid_is_valid(u
->ref_uid
))
3631 (void) serialize_item_format(f
, "ref-uid", UID_FMT
, u
->ref_uid
);
3632 if (gid_is_valid(u
->ref_gid
))
3633 (void) serialize_item_format(f
, "ref-gid", GID_FMT
, u
->ref_gid
);
3635 if (!sd_id128_is_null(u
->invocation_id
))
3636 (void) serialize_item_format(f
, "invocation-id", SD_ID128_FORMAT_STR
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
3638 (void) serialize_item_format(f
, "freezer-state", "%s", freezer_state_to_string(unit_freezer_state(u
)));
3640 bus_track_serialize(u
->bus_track
, f
, "ref");
3642 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
3645 r
= unit_get_ip_accounting(u
, m
, &v
);
3647 (void) serialize_item_format(f
, ip_accounting_metric_field
[m
], "%" PRIu64
, v
);
3650 if (serialize_jobs
) {
3653 job_serialize(u
->job
, f
);
3658 job_serialize(u
->nop_job
, f
);
3667 static int unit_deserialize_job(Unit
*u
, FILE *f
) {
3668 _cleanup_(job_freep
) Job
*j
= NULL
;
3678 r
= job_deserialize(j
, f
);
3682 r
= job_install_deserialized(j
);
3690 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
3698 _cleanup_free_
char *line
= NULL
;
3703 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3705 return log_error_errno(r
, "Failed to read serialization line: %m");
3706 if (r
== 0) /* eof */
3710 if (isempty(l
)) /* End marker */
3713 k
= strcspn(l
, "=");
3721 if (streq(l
, "job")) {
3723 /* New-style serialized job */
3724 r
= unit_deserialize_job(u
, f
);
3727 } else /* Legacy for pre-44 */
3728 log_unit_warning(u
, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v
);
3730 } else if (streq(l
, "state-change-timestamp")) {
3731 (void) deserialize_dual_timestamp(v
, &u
->state_change_timestamp
);
3733 } else if (streq(l
, "inactive-exit-timestamp")) {
3734 (void) deserialize_dual_timestamp(v
, &u
->inactive_exit_timestamp
);
3736 } else if (streq(l
, "active-enter-timestamp")) {
3737 (void) deserialize_dual_timestamp(v
, &u
->active_enter_timestamp
);
3739 } else if (streq(l
, "active-exit-timestamp")) {
3740 (void) deserialize_dual_timestamp(v
, &u
->active_exit_timestamp
);
3742 } else if (streq(l
, "inactive-enter-timestamp")) {
3743 (void) deserialize_dual_timestamp(v
, &u
->inactive_enter_timestamp
);
3745 } else if (streq(l
, "condition-timestamp")) {
3746 (void) deserialize_dual_timestamp(v
, &u
->condition_timestamp
);
3748 } else if (streq(l
, "assert-timestamp")) {
3749 (void) deserialize_dual_timestamp(v
, &u
->assert_timestamp
);
3751 } else if (streq(l
, "condition-result")) {
3753 r
= parse_boolean(v
);
3755 log_unit_debug(u
, "Failed to parse condition result value %s, ignoring.", v
);
3757 u
->condition_result
= r
;
3761 } else if (streq(l
, "assert-result")) {
3763 r
= parse_boolean(v
);
3765 log_unit_debug(u
, "Failed to parse assert result value %s, ignoring.", v
);
3767 u
->assert_result
= r
;
3771 } else if (streq(l
, "transient")) {
3773 r
= parse_boolean(v
);
3775 log_unit_debug(u
, "Failed to parse transient bool %s, ignoring.", v
);
3781 } else if (streq(l
, "in-audit")) {
3783 r
= parse_boolean(v
);
3785 log_unit_debug(u
, "Failed to parse in-audit bool %s, ignoring.", v
);
3791 } else if (streq(l
, "exported-invocation-id")) {
3793 r
= parse_boolean(v
);
3795 log_unit_debug(u
, "Failed to parse exported invocation ID bool %s, ignoring.", v
);
3797 u
->exported_invocation_id
= r
;
3801 } else if (streq(l
, "exported-log-level-max")) {
3803 r
= parse_boolean(v
);
3805 log_unit_debug(u
, "Failed to parse exported log level max bool %s, ignoring.", v
);
3807 u
->exported_log_level_max
= r
;
3811 } else if (streq(l
, "exported-log-extra-fields")) {
3813 r
= parse_boolean(v
);
3815 log_unit_debug(u
, "Failed to parse exported log extra fields bool %s, ignoring.", v
);
3817 u
->exported_log_extra_fields
= r
;
3821 } else if (streq(l
, "exported-log-rate-limit-interval")) {
3823 r
= parse_boolean(v
);
3825 log_unit_debug(u
, "Failed to parse exported log rate limit interval %s, ignoring.", v
);
3827 u
->exported_log_ratelimit_interval
= r
;
3831 } else if (streq(l
, "exported-log-rate-limit-burst")) {
3833 r
= parse_boolean(v
);
3835 log_unit_debug(u
, "Failed to parse exported log rate limit burst %s, ignoring.", v
);
3837 u
->exported_log_ratelimit_burst
= r
;
3841 } else if (STR_IN_SET(l
, "cpu-usage-base", "cpuacct-usage-base")) {
3843 r
= safe_atou64(v
, &u
->cpu_usage_base
);
3845 log_unit_debug(u
, "Failed to parse CPU usage base %s, ignoring.", v
);
3849 } else if (streq(l
, "cpu-usage-last")) {
3851 r
= safe_atou64(v
, &u
->cpu_usage_last
);
3853 log_unit_debug(u
, "Failed to read CPU usage last %s, ignoring.", v
);
3857 } else if (streq(l
, "managed-oom-kill-last")) {
3859 r
= safe_atou64(v
, &u
->managed_oom_kill_last
);
3861 log_unit_debug(u
, "Failed to read managed OOM kill last %s, ignoring.", v
);
3865 } else if (streq(l
, "oom-kill-last")) {
3867 r
= safe_atou64(v
, &u
->oom_kill_last
);
3869 log_unit_debug(u
, "Failed to read OOM kill last %s, ignoring.", v
);
3873 } else if (streq(l
, "cgroup")) {
3875 r
= unit_set_cgroup_path(u
, v
);
3877 log_unit_debug_errno(u
, r
, "Failed to set cgroup path %s, ignoring: %m", v
);
3879 (void) unit_watch_cgroup(u
);
3880 (void) unit_watch_cgroup_memory(u
);
3883 } else if (streq(l
, "cgroup-realized")) {
3886 b
= parse_boolean(v
);
3888 log_unit_debug(u
, "Failed to parse cgroup-realized bool %s, ignoring.", v
);
3890 u
->cgroup_realized
= b
;
3894 } else if (streq(l
, "cgroup-realized-mask")) {
3896 r
= cg_mask_from_string(v
, &u
->cgroup_realized_mask
);
3898 log_unit_debug(u
, "Failed to parse cgroup-realized-mask %s, ignoring.", v
);
3901 } else if (streq(l
, "cgroup-enabled-mask")) {
3903 r
= cg_mask_from_string(v
, &u
->cgroup_enabled_mask
);
3905 log_unit_debug(u
, "Failed to parse cgroup-enabled-mask %s, ignoring.", v
);
3908 } else if (streq(l
, "cgroup-invalidated-mask")) {
3910 r
= cg_mask_from_string(v
, &u
->cgroup_invalidated_mask
);
3912 log_unit_debug(u
, "Failed to parse cgroup-invalidated-mask %s, ignoring.", v
);
3915 } else if (streq(l
, "ref-uid")) {
3918 r
= parse_uid(v
, &uid
);
3920 log_unit_debug(u
, "Failed to parse referenced UID %s, ignoring.", v
);
3922 unit_ref_uid_gid(u
, uid
, GID_INVALID
);
3926 } else if (streq(l
, "ref-gid")) {
3929 r
= parse_gid(v
, &gid
);
3931 log_unit_debug(u
, "Failed to parse referenced GID %s, ignoring.", v
);
3933 unit_ref_uid_gid(u
, UID_INVALID
, gid
);
3937 } else if (streq(l
, "ref")) {
3939 r
= strv_extend(&u
->deserialized_refs
, v
);
3944 } else if (streq(l
, "invocation-id")) {
3947 r
= sd_id128_from_string(v
, &id
);
3949 log_unit_debug(u
, "Failed to parse invocation id %s, ignoring.", v
);
3951 r
= unit_set_invocation_id(u
, id
);
3953 log_unit_warning_errno(u
, r
, "Failed to set invocation ID for unit: %m");
3957 } else if (streq(l
, "freezer-state")) {
3960 s
= freezer_state_from_string(v
);
3962 log_unit_debug(u
, "Failed to deserialize freezer-state '%s', ignoring.", v
);
3964 u
->freezer_state
= s
;
3969 /* Check if this is an IP accounting metric serialization field */
3970 m
= string_table_lookup(ip_accounting_metric_field
, ELEMENTSOF(ip_accounting_metric_field
), l
);
3974 r
= safe_atou64(v
, &c
);
3976 log_unit_debug(u
, "Failed to parse IP accounting value %s, ignoring.", v
);
3978 u
->ip_accounting_extra
[m
] = c
;
3982 m
= string_table_lookup(io_accounting_metric_field_base
, ELEMENTSOF(io_accounting_metric_field_base
), l
);
3986 r
= safe_atou64(v
, &c
);
3988 log_unit_debug(u
, "Failed to parse IO accounting base value %s, ignoring.", v
);
3990 u
->io_accounting_base
[m
] = c
;
3994 m
= string_table_lookup(io_accounting_metric_field_last
, ELEMENTSOF(io_accounting_metric_field_last
), l
);
3998 r
= safe_atou64(v
, &c
);
4000 log_unit_debug(u
, "Failed to parse IO accounting last value %s, ignoring.", v
);
4002 u
->io_accounting_last
[m
] = c
;
4006 if (unit_can_serialize(u
)) {
4007 r
= exec_runtime_deserialize_compat(u
, l
, v
, fds
);
4009 log_unit_warning(u
, "Failed to deserialize runtime parameter '%s', ignoring.", l
);
4013 /* Returns positive if key was handled by the call */
4017 r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
);
4019 log_unit_warning(u
, "Failed to deserialize unit parameter '%s', ignoring.", l
);
4023 /* Versions before 228 did not carry a state change timestamp. In this case, take the current time. This is
4024 * useful, so that timeouts based on this timestamp don't trigger too early, and is in-line with the logic from
4025 * before 228 where the base for timeouts was not persistent across reboots. */
4027 if (!dual_timestamp_is_set(&u
->state_change_timestamp
))
4028 dual_timestamp_get(&u
->state_change_timestamp
);
4030 /* Let's make sure that everything that is deserialized also gets any potential new cgroup settings applied
4031 * after we are done. For that we invalidate anything already realized, so that we can realize it again. */
4032 unit_invalidate_cgroup(u
, _CGROUP_MASK_ALL
);
4033 unit_invalidate_cgroup_bpf(u
);
4038 int unit_deserialize_skip(FILE *f
) {
4042 /* Skip serialized data for this unit. We don't know what it is. */
4045 _cleanup_free_
char *line
= NULL
;
4048 r
= read_line(f
, LONG_LINE_MAX
, &line
);
4050 return log_error_errno(r
, "Failed to read serialization line: %m");
4062 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
4063 _cleanup_free_
char *e
= NULL
;
4069 /* Adds in links to the device node that this unit is based on */
4073 if (!is_device_path(what
))
4076 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
4077 if (!unit_type_supported(UNIT_DEVICE
))
4080 r
= unit_name_from_path(what
, ".device", &e
);
4084 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
4088 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
4089 dep
= UNIT_BINDS_TO
;
4091 return unit_add_two_dependencies(u
, UNIT_AFTER
,
4092 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
4093 device
, true, mask
);
4096 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
4097 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
4105 if (!path_startswith(what
, "/dev/"))
4108 /* If we don't support devices, then also don't bother with blockdev@.target */
4109 if (!unit_type_supported(UNIT_DEVICE
))
4112 r
= unit_name_path_escape(what
, &escaped
);
4116 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
4120 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
4123 int unit_coldplug(Unit
*u
) {
4130 /* Make sure we don't enter a loop, when coldplugging recursively. */
4134 u
->coldplugged
= true;
4136 STRV_FOREACH(i
, u
->deserialized_refs
) {
4137 q
= bus_unit_track_add_name(u
, *i
);
4138 if (q
< 0 && r
>= 0)
4141 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
4143 if (UNIT_VTABLE(u
)->coldplug
) {
4144 q
= UNIT_VTABLE(u
)->coldplug(u
);
4145 if (q
< 0 && r
>= 0)
4149 uj
= u
->job
?: u
->nop_job
;
4151 q
= job_coldplug(uj
);
4152 if (q
< 0 && r
>= 0)
4159 void unit_catchup(Unit
*u
) {
4162 if (UNIT_VTABLE(u
)->catchup
)
4163 UNIT_VTABLE(u
)->catchup(u
);
4166 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
4172 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
4173 * are never out-of-date. */
4174 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
4177 if (stat(path
, &st
) < 0)
4178 /* What, cannot access this anymore? */
4182 /* For masked files check if they are still so */
4183 return !null_or_empty(&st
);
4185 /* For non-empty files check the mtime */
4186 return timespec_load(&st
.st_mtim
) > mtime
;
4191 bool unit_need_daemon_reload(Unit
*u
) {
4192 _cleanup_strv_free_
char **t
= NULL
;
4197 /* For unit files, we allow masking… */
4198 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
4199 u
->load_state
== UNIT_MASKED
))
4202 /* Source paths should not be masked… */
4203 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
4206 if (u
->load_state
== UNIT_LOADED
)
4207 (void) unit_find_dropin_paths(u
, &t
);
4208 if (!strv_equal(u
->dropin_paths
, t
))
4211 /* … any drop-ins that are masked are simply omitted from the list. */
4212 STRV_FOREACH(path
, u
->dropin_paths
)
4213 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
4219 void unit_reset_failed(Unit
*u
) {
4222 if (UNIT_VTABLE(u
)->reset_failed
)
4223 UNIT_VTABLE(u
)->reset_failed(u
);
4225 ratelimit_reset(&u
->start_ratelimit
);
4226 u
->start_limit_hit
= false;
4229 Unit
*unit_following(Unit
*u
) {
4232 if (UNIT_VTABLE(u
)->following
)
4233 return UNIT_VTABLE(u
)->following(u
);
4238 bool unit_stop_pending(Unit
*u
) {
4241 /* This call does check the current state of the unit. It's
4242 * hence useful to be called from state change calls of the
4243 * unit itself, where the state isn't updated yet. This is
4244 * different from unit_inactive_or_pending() which checks both
4245 * the current state and for a queued job. */
4247 return unit_has_job_type(u
, JOB_STOP
);
4250 bool unit_inactive_or_pending(Unit
*u
) {
4253 /* Returns true if the unit is inactive or going down */
4255 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
4258 if (unit_stop_pending(u
))
4264 bool unit_active_or_pending(Unit
*u
) {
4267 /* Returns true if the unit is active or going up */
4269 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
4273 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
4279 bool unit_will_restart_default(Unit
*u
) {
4282 return unit_has_job_type(u
, JOB_START
);
4285 bool unit_will_restart(Unit
*u
) {
4288 if (!UNIT_VTABLE(u
)->will_restart
)
4291 return UNIT_VTABLE(u
)->will_restart(u
);
4294 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
4296 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
4297 assert(SIGNAL_VALID(signo
));
4299 if (!UNIT_VTABLE(u
)->kill
)
4302 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
4305 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
4306 _cleanup_set_free_ Set
*pid_set
= NULL
;
4309 pid_set
= set_new(NULL
);
4313 /* Exclude the main/control pids from being killed via the cgroup */
4315 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
4320 if (control_pid
> 0) {
4321 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
4326 return TAKE_PTR(pid_set
);
4329 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
4330 _cleanup_free_
char *comm
= NULL
;
4335 (void) get_process_comm(pid
, &comm
);
4336 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
4337 signal_to_string(signo
), pid
, strna(comm
));
4342 int unit_kill_common(
4348 sd_bus_error
*error
) {
4351 bool killed
= false;
4353 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
4354 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
4355 * stop a service ourselves. */
4357 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
4359 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
4361 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
4364 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
4365 if (control_pid
< 0)
4366 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
4367 if (control_pid
== 0)
4368 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
4371 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
4372 if (control_pid
> 0) {
4373 _cleanup_free_
char *comm
= NULL
;
4374 (void) get_process_comm(control_pid
, &comm
);
4376 if (kill(control_pid
, signo
) < 0) {
4377 /* Report this failure both to the logs and to the client */
4378 sd_bus_error_set_errnof(
4380 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
4381 signal_to_string(signo
), control_pid
, strna(comm
));
4382 r
= log_unit_warning_errno(
4384 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
4385 signal_to_string(signo
), control_pid
, strna(comm
));
4387 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
4388 signal_to_string(signo
), control_pid
, strna(comm
));
4393 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
4395 _cleanup_free_
char *comm
= NULL
;
4396 (void) get_process_comm(main_pid
, &comm
);
4398 if (kill(main_pid
, signo
) < 0) {
4400 sd_bus_error_set_errnof(
4402 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
4403 signal_to_string(signo
), main_pid
, strna(comm
));
4405 r
= log_unit_warning_errno(
4407 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
4408 signal_to_string(signo
), main_pid
, strna(comm
));
4410 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
4411 signal_to_string(signo
), main_pid
, strna(comm
));
4416 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
4417 _cleanup_set_free_ Set
*pid_set
= NULL
;
4420 /* Exclude the main/control pids from being killed via the cgroup */
4421 pid_set
= unit_pid_set(main_pid
, control_pid
);
4425 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
4427 if (!IN_SET(q
, -ESRCH
, -ENOENT
)) {
4429 sd_bus_error_set_errnof(
4431 "Failed to send signal SIG%s to auxiliary processes: %m",
4432 signal_to_string(signo
));
4434 r
= log_unit_warning_errno(
4436 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
4437 signal_to_string(signo
));
4443 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
4444 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
4445 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
4450 int unit_following_set(Unit
*u
, Set
**s
) {
4454 if (UNIT_VTABLE(u
)->following_set
)
4455 return UNIT_VTABLE(u
)->following_set(u
, s
);
4461 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
4466 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
4467 r
= unit_file_get_state(
4468 u
->manager
->unit_file_scope
,
4471 &u
->unit_file_state
);
4473 u
->unit_file_state
= UNIT_FILE_BAD
;
4476 return u
->unit_file_state
;
4479 int unit_get_unit_file_preset(Unit
*u
) {
4482 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
4483 u
->unit_file_preset
= unit_file_query_preset(
4484 u
->manager
->unit_file_scope
,
4486 basename(u
->fragment_path
),
4489 return u
->unit_file_preset
;
4492 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
4498 unit_ref_unset(ref
);
4500 ref
->source
= source
;
4501 ref
->target
= target
;
4502 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4506 void unit_ref_unset(UnitRef
*ref
) {
4512 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4513 * be unreferenced now. */
4514 unit_add_to_gc_queue(ref
->target
);
4516 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4517 ref
->source
= ref
->target
= NULL
;
4520 static int user_from_unit_name(Unit
*u
, char **ret
) {
4522 static const uint8_t hash_key
[] = {
4523 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4524 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4527 _cleanup_free_
char *n
= NULL
;
4530 r
= unit_name_to_prefix(u
->id
, &n
);
4534 if (valid_user_group_name(n
, 0)) {
4539 /* If we can't use the unit name as a user name, then let's hash it and use that */
4540 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4546 int unit_patch_contexts(Unit
*u
) {
4553 /* Patch in the manager defaults into the exec and cgroup
4554 * contexts, _after_ the rest of the settings have been
4557 ec
= unit_get_exec_context(u
);
4559 /* This only copies in the ones that need memory */
4560 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4561 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4562 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4567 if (MANAGER_IS_USER(u
->manager
) &&
4568 !ec
->working_directory
) {
4570 r
= get_home_dir(&ec
->working_directory
);
4574 /* Allow user services to run, even if the
4575 * home directory is missing */
4576 ec
->working_directory_missing_ok
= true;
4579 if (ec
->private_devices
)
4580 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4582 if (ec
->protect_kernel_modules
)
4583 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4585 if (ec
->protect_kernel_logs
)
4586 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4588 if (ec
->protect_clock
)
4589 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4591 if (ec
->dynamic_user
) {
4593 r
= user_from_unit_name(u
, &ec
->user
);
4599 ec
->group
= strdup(ec
->user
);
4604 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4605 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4608 ec
->private_tmp
= true;
4609 ec
->remove_ipc
= true;
4610 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4611 if (ec
->protect_home
== PROTECT_HOME_NO
)
4612 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4614 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4616 ec
->no_new_privileges
= true;
4617 ec
->restrict_suid_sgid
= true;
4621 cc
= unit_get_cgroup_context(u
);
4624 if (ec
->private_devices
&&
4625 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4626 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4628 if ((ec
->root_image
|| !LIST_IS_EMPTY(ec
->mount_images
)) &&
4629 (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
)) {
4632 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4633 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4634 r
= cgroup_add_device_allow(cc
, p
, "rw");
4638 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4639 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4644 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4645 * Same for mapper and verity. */
4646 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4647 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4653 if (ec
->protect_clock
) {
4654 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4663 ExecContext
*unit_get_exec_context(Unit
*u
) {
4670 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4674 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4677 KillContext
*unit_get_kill_context(Unit
*u
) {
4684 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4688 return (KillContext
*) ((uint8_t*) u
+ offset
);
4691 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4697 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4701 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4704 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4710 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4714 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4717 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4720 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4723 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4724 return u
->manager
->lookup_paths
.transient
;
4726 if (flags
& UNIT_PERSISTENT
)
4727 return u
->manager
->lookup_paths
.persistent_control
;
4729 if (flags
& UNIT_RUNTIME
)
4730 return u
->manager
->lookup_paths
.runtime_control
;
4735 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4741 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4742 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4743 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4744 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4745 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4748 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4749 ret
= specifier_escape(s
);
4756 if (flags
& UNIT_ESCAPE_C
) {
4769 return ret
?: (char*) s
;
4772 return ret
?: strdup(s
);
4775 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4776 _cleanup_free_
char *result
= NULL
;
4777 size_t n
= 0, allocated
= 0;
4780 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4781 * way suitable for ExecStart= stanzas */
4783 STRV_FOREACH(i
, l
) {
4784 _cleanup_free_
char *buf
= NULL
;
4789 p
= unit_escape_setting(*i
, flags
, &buf
);
4793 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4794 if (!GREEDY_REALLOC(result
, allocated
, n
+ a
+ 1))
4808 if (!GREEDY_REALLOC(result
, allocated
, n
+ 1))
4813 return TAKE_PTR(result
);
4816 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4817 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4818 const char *dir
, *wrapped
;
4825 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4828 data
= unit_escape_setting(data
, flags
, &escaped
);
4832 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4833 * previous section header is the same */
4835 if (flags
& UNIT_PRIVATE
) {
4836 if (!UNIT_VTABLE(u
)->private_section
)
4839 if (!u
->transient_file
|| u
->last_section_private
< 0)
4840 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4841 else if (u
->last_section_private
== 0)
4842 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4844 if (!u
->transient_file
|| u
->last_section_private
< 0)
4845 data
= strjoina("[Unit]\n", data
);
4846 else if (u
->last_section_private
> 0)
4847 data
= strjoina("\n[Unit]\n", data
);
4850 if (u
->transient_file
) {
4851 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4852 * write to the transient unit file. */
4853 fputs(data
, u
->transient_file
);
4855 if (!endswith(data
, "\n"))
4856 fputc('\n', u
->transient_file
);
4858 /* Remember which section we wrote this entry to */
4859 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4863 dir
= unit_drop_in_dir(u
, flags
);
4867 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4868 "# or an equivalent operation. Do not edit.\n",
4872 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4876 (void) mkdir_p_label(p
, 0755);
4878 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4879 * recreate the cache after every drop-in we write. */
4880 if (u
->manager
->unit_path_cache
) {
4881 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4886 r
= write_string_file_atomic_label(q
, wrapped
);
4890 r
= strv_push(&u
->dropin_paths
, q
);
4895 strv_uniq(u
->dropin_paths
);
4897 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4902 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4903 _cleanup_free_
char *p
= NULL
;
4911 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4914 va_start(ap
, format
);
4915 r
= vasprintf(&p
, format
, ap
);
4921 return unit_write_setting(u
, flags
, name
, p
);
4924 int unit_make_transient(Unit
*u
) {
4925 _cleanup_free_
char *path
= NULL
;
4930 if (!UNIT_VTABLE(u
)->can_transient
)
4933 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4935 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4939 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4940 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4942 RUN_WITH_UMASK(0022) {
4943 f
= fopen(path
, "we");
4948 safe_fclose(u
->transient_file
);
4949 u
->transient_file
= f
;
4951 free_and_replace(u
->fragment_path
, path
);
4953 u
->source_path
= mfree(u
->source_path
);
4954 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4955 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4957 u
->load_state
= UNIT_STUB
;
4959 u
->transient
= true;
4961 unit_add_to_dbus_queue(u
);
4962 unit_add_to_gc_queue(u
);
4964 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4970 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4971 _cleanup_free_
char *comm
= NULL
;
4973 (void) get_process_comm(pid
, &comm
);
4975 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4976 only, like for example systemd's own PAM stub process. */
4977 if (comm
&& comm
[0] == '(')
4980 log_unit_notice(userdata
,
4981 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4984 signal_to_string(sig
));
4989 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4994 case KILL_TERMINATE
:
4995 case KILL_TERMINATE_AND_LOG
:
4996 *noteworthy
= false;
4997 return c
->kill_signal
;
5000 *noteworthy
= false;
5001 return restart_kill_signal(c
);
5005 return c
->final_kill_signal
;
5009 return c
->watchdog_signal
;
5012 assert_not_reached("KillOperation unknown");
5016 int unit_kill_context(
5022 bool main_pid_alien
) {
5024 bool wait_for_exit
= false, send_sighup
;
5025 cg_kill_log_func_t log_func
= NULL
;
5031 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
5032 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
5033 * which is used for user-requested killing of unit processes. */
5035 if (c
->kill_mode
== KILL_NONE
)
5039 sig
= operation_to_signal(c
, k
, ¬eworthy
);
5041 log_func
= log_kill
;
5045 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
5050 log_func(main_pid
, sig
, u
);
5052 r
= kill_and_sigcont(main_pid
, sig
);
5053 if (r
< 0 && r
!= -ESRCH
) {
5054 _cleanup_free_
char *comm
= NULL
;
5055 (void) get_process_comm(main_pid
, &comm
);
5057 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
5059 if (!main_pid_alien
)
5060 wait_for_exit
= true;
5062 if (r
!= -ESRCH
&& send_sighup
)
5063 (void) kill(main_pid
, SIGHUP
);
5067 if (control_pid
> 0) {
5069 log_func(control_pid
, sig
, u
);
5071 r
= kill_and_sigcont(control_pid
, sig
);
5072 if (r
< 0 && r
!= -ESRCH
) {
5073 _cleanup_free_
char *comm
= NULL
;
5074 (void) get_process_comm(control_pid
, &comm
);
5076 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
5078 wait_for_exit
= true;
5080 if (r
!= -ESRCH
&& send_sighup
)
5081 (void) kill(control_pid
, SIGHUP
);
5085 if (u
->cgroup_path
&&
5086 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
5087 _cleanup_set_free_ Set
*pid_set
= NULL
;
5089 /* Exclude the main/control pids from being killed via the cgroup */
5090 pid_set
= unit_pid_set(main_pid
, control_pid
);
5094 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
5096 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
5100 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
5101 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
5105 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
5106 * we are running in a container or if this is a delegation unit, simply because cgroup
5107 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
5108 * of containers it can be confused easily by left-over directories in the cgroup — which
5109 * however should not exist in non-delegated units. On the unified hierarchy that's different,
5110 * there we get proper events. Hence rely on them. */
5112 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
5113 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
5114 wait_for_exit
= true;
5119 pid_set
= unit_pid_set(main_pid
, control_pid
);
5123 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
5132 return wait_for_exit
;
5135 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
5136 _cleanup_free_
char *p
= NULL
;
5137 UnitDependencyInfo di
;
5143 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these paths in
5144 * the unit (from the path to the UnitDependencyInfo structure indicating how to the dependency came to
5145 * be). However, we build a prefix table for all possible prefixes so that new appearing mount units can easily
5146 * determine which units to make themselves a dependency of. */
5148 if (!path_is_absolute(path
))
5151 r
= hashmap_ensure_allocated(&u
->requires_mounts_for
, &path_hash_ops
);
5159 path
= path_simplify(p
, true);
5161 if (!path_is_normalized(path
))
5164 if (hashmap_contains(u
->requires_mounts_for
, path
))
5167 di
= (UnitDependencyInfo
) {
5171 r
= hashmap_put(u
->requires_mounts_for
, path
, di
.data
);
5176 char prefix
[strlen(path
) + 1];
5177 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
5180 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
5182 _cleanup_free_
char *q
= NULL
;
5184 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
5196 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
5212 int unit_setup_exec_runtime(Unit
*u
) {
5219 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
5222 /* Check if there already is an ExecRuntime for this unit? */
5223 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
5227 /* Try to get it from somebody else */
5228 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_JOINS_NAMESPACE_OF
]) {
5229 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
5234 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
5237 int unit_setup_dynamic_creds(Unit
*u
) {
5239 DynamicCreds
*dcreds
;
5244 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
5246 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
5248 ec
= unit_get_exec_context(u
);
5251 if (!ec
->dynamic_user
)
5254 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
5257 bool unit_type_supported(UnitType t
) {
5258 if (_unlikely_(t
< 0))
5260 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
5263 if (!unit_vtable
[t
]->supported
)
5266 return unit_vtable
[t
]->supported();
5269 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
5275 r
= dir_is_empty(where
);
5276 if (r
> 0 || r
== -ENOTDIR
)
5279 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
5283 log_struct(LOG_NOTICE
,
5284 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5286 LOG_UNIT_INVOCATION_ID(u
),
5287 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
5291 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
5292 _cleanup_free_
char *canonical_where
= NULL
;
5298 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
5300 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
5304 /* We will happily ignore a trailing slash (or any redundant slashes) */
5305 if (path_equal(where
, canonical_where
))
5308 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
5310 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5312 LOG_UNIT_INVOCATION_ID(u
),
5313 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
5319 bool unit_is_pristine(Unit
*u
) {
5322 /* Check if the unit already exists or is already around,
5323 * in a number of different ways. Note that to cater for unit
5324 * types such as slice, we are generally fine with units that
5325 * are marked UNIT_LOADED even though nothing was actually
5326 * loaded, as those unit types don't require a file on disk. */
5328 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
5331 !strv_isempty(u
->dropin_paths
) ||
5336 pid_t
unit_control_pid(Unit
*u
) {
5339 if (UNIT_VTABLE(u
)->control_pid
)
5340 return UNIT_VTABLE(u
)->control_pid(u
);
5345 pid_t
unit_main_pid(Unit
*u
) {
5348 if (UNIT_VTABLE(u
)->main_pid
)
5349 return UNIT_VTABLE(u
)->main_pid(u
);
5354 static void unit_unref_uid_internal(
5358 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
5362 assert(_manager_unref_uid
);
5364 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
5365 * gid_t are actually the same time, with the same validity rules.
5367 * Drops a reference to UID/GID from a unit. */
5369 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5370 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5372 if (!uid_is_valid(*ref_uid
))
5375 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
5376 *ref_uid
= UID_INVALID
;
5379 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
5380 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
5383 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
5384 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
5387 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
5390 unit_unref_uid(u
, destroy_now
);
5391 unit_unref_gid(u
, destroy_now
);
5394 static int unit_ref_uid_internal(
5399 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
5405 assert(uid_is_valid(uid
));
5406 assert(_manager_ref_uid
);
5408 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
5409 * are actually the same type, and have the same validity rules.
5411 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
5412 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
5415 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5416 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5418 if (*ref_uid
== uid
)
5421 if (uid_is_valid(*ref_uid
)) /* Already set? */
5424 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
5432 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
5433 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
5436 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
5437 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
5440 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
5445 /* Reference both a UID and a GID in one go. Either references both, or neither. */
5447 if (uid_is_valid(uid
)) {
5448 r
= unit_ref_uid(u
, uid
, clean_ipc
);
5453 if (gid_is_valid(gid
)) {
5454 q
= unit_ref_gid(u
, gid
, clean_ipc
);
5457 unit_unref_uid(u
, false);
5463 return r
> 0 || q
> 0;
5466 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
5472 c
= unit_get_exec_context(u
);
5474 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
5476 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
5481 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
5486 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
5487 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
5488 * objects when no service references the UID/GID anymore. */
5490 r
= unit_ref_uid_gid(u
, uid
, gid
);
5492 unit_add_to_dbus_queue(u
);
5495 int unit_acquire_invocation_id(Unit
*u
) {
5501 r
= sd_id128_randomize(&id
);
5503 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
5505 r
= unit_set_invocation_id(u
, id
);
5507 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5509 unit_add_to_dbus_queue(u
);
5513 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5519 /* Copy parameters from manager */
5520 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5524 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5525 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5526 p
->prefix
= u
->manager
->prefix
;
5527 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5529 /* Copy parameters from unit */
5530 p
->cgroup_path
= u
->cgroup_path
;
5531 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5533 p
->received_credentials
= u
->manager
->received_credentials
;
5538 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5544 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5545 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5547 (void) unit_realize_cgroup(u
);
5549 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5553 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
, -1);
5554 (void) ignore_signals(SIGPIPE
, -1);
5556 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5558 if (u
->cgroup_path
) {
5559 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5561 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5569 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5576 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5580 int ret
= EXIT_SUCCESS
;
5583 STRV_FOREACH(i
, paths
) {
5584 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5586 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5594 r
= unit_watch_pid(u
, pid
, true);
5602 static void unit_update_dependency_mask(Unit
*u
, UnitDependency d
, Unit
*other
, UnitDependencyInfo di
) {
5605 assert(d
< _UNIT_DEPENDENCY_MAX
);
5608 if (di
.origin_mask
== 0 && di
.destination_mask
== 0) {
5609 /* No bit set anymore, let's drop the whole entry */
5610 assert_se(hashmap_remove(u
->dependencies
[d
], other
));
5611 log_unit_debug(u
, "lost dependency %s=%s", unit_dependency_to_string(d
), other
->id
);
5613 /* Mask was reduced, let's update the entry */
5614 assert_se(hashmap_update(u
->dependencies
[d
], other
, di
.data
) == 0);
5617 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5620 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5625 for (UnitDependency d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
5629 UnitDependencyInfo di
;
5634 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
]) {
5635 if (FLAGS_SET(~mask
, di
.origin_mask
))
5637 di
.origin_mask
&= ~mask
;
5638 unit_update_dependency_mask(u
, d
, other
, di
);
5640 /* We updated the dependency from our unit to the other unit now. But most dependencies
5641 * imply a reverse dependency. Hence, let's delete that one too. For that we go through
5642 * all dependency types on the other unit and delete all those which point to us and
5643 * have the right mask set. */
5645 for (UnitDependency q
= 0; q
< _UNIT_DEPENDENCY_MAX
; q
++) {
5646 UnitDependencyInfo dj
;
5648 dj
.data
= hashmap_get(other
->dependencies
[q
], u
);
5649 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5651 dj
.destination_mask
&= ~mask
;
5653 unit_update_dependency_mask(other
, q
, u
, dj
);
5656 unit_add_to_gc_queue(other
);
5666 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5673 if (MANAGER_IS_SYSTEM(u
->manager
))
5674 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5676 _cleanup_free_
char *user_path
= NULL
;
5677 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5680 p
= strjoin(user_path
, u
->id
);
5690 static int unit_export_invocation_id(Unit
*u
) {
5691 _cleanup_free_
char *p
= NULL
;
5696 if (u
->exported_invocation_id
)
5699 if (sd_id128_is_null(u
->invocation_id
))
5702 r
= unit_get_invocation_path(u
, &p
);
5704 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5706 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5708 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5710 u
->exported_invocation_id
= true;
5714 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5722 if (u
->exported_log_level_max
)
5725 if (c
->log_level_max
< 0)
5728 assert(c
->log_level_max
<= 7);
5730 buf
[0] = '0' + c
->log_level_max
;
5733 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5734 r
= symlink_atomic(buf
, p
);
5736 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5738 u
->exported_log_level_max
= true;
5742 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5743 _cleanup_close_
int fd
= -1;
5744 struct iovec
*iovec
;
5751 if (u
->exported_log_extra_fields
)
5754 if (c
->n_log_extra_fields
<= 0)
5757 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5758 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5760 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5761 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5763 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5764 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5767 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5768 pattern
= strjoina(p
, ".XXXXXX");
5770 fd
= mkostemp_safe(pattern
);
5772 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5774 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5776 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5780 (void) fchmod(fd
, 0644);
5782 if (rename(pattern
, p
) < 0) {
5783 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5787 u
->exported_log_extra_fields
= true;
5791 (void) unlink(pattern
);
5795 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5796 _cleanup_free_
char *buf
= NULL
;
5803 if (u
->exported_log_ratelimit_interval
)
5806 if (c
->log_ratelimit_interval_usec
== 0)
5809 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5811 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5814 r
= symlink_atomic(buf
, p
);
5816 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5818 u
->exported_log_ratelimit_interval
= true;
5822 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5823 _cleanup_free_
char *buf
= NULL
;
5830 if (u
->exported_log_ratelimit_burst
)
5833 if (c
->log_ratelimit_burst
== 0)
5836 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5838 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5841 r
= symlink_atomic(buf
, p
);
5843 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5845 u
->exported_log_ratelimit_burst
= true;
5849 void unit_export_state_files(Unit
*u
) {
5850 const ExecContext
*c
;
5857 if (MANAGER_IS_TEST_RUN(u
->manager
))
5860 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5861 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5862 * the IPC system itself and PID 1 also log to the journal.
5864 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5865 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5866 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5867 * namespace at least.
5869 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5870 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5873 (void) unit_export_invocation_id(u
);
5875 if (!MANAGER_IS_SYSTEM(u
->manager
))
5878 c
= unit_get_exec_context(u
);
5880 (void) unit_export_log_level_max(u
, c
);
5881 (void) unit_export_log_extra_fields(u
, c
);
5882 (void) unit_export_log_ratelimit_interval(u
, c
);
5883 (void) unit_export_log_ratelimit_burst(u
, c
);
5887 void unit_unlink_state_files(Unit
*u
) {
5895 /* Undoes the effect of unit_export_state() */
5897 if (u
->exported_invocation_id
) {
5898 _cleanup_free_
char *invocation_path
= NULL
;
5899 int r
= unit_get_invocation_path(u
, &invocation_path
);
5901 (void) unlink(invocation_path
);
5902 u
->exported_invocation_id
= false;
5906 if (!MANAGER_IS_SYSTEM(u
->manager
))
5909 if (u
->exported_log_level_max
) {
5910 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5913 u
->exported_log_level_max
= false;
5916 if (u
->exported_log_extra_fields
) {
5917 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5920 u
->exported_log_extra_fields
= false;
5923 if (u
->exported_log_ratelimit_interval
) {
5924 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5927 u
->exported_log_ratelimit_interval
= false;
5930 if (u
->exported_log_ratelimit_burst
) {
5931 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5934 u
->exported_log_ratelimit_burst
= false;
5938 int unit_prepare_exec(Unit
*u
) {
5943 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5944 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5945 r
= bpf_firewall_load_custom(u
);
5949 /* Prepares everything so that we can fork of a process for this unit */
5951 (void) unit_realize_cgroup(u
);
5953 if (u
->reset_accounting
) {
5954 (void) unit_reset_accounting(u
);
5955 u
->reset_accounting
= false;
5958 unit_export_state_files(u
);
5960 r
= unit_setup_exec_runtime(u
);
5964 r
= unit_setup_dynamic_creds(u
);
5971 static bool ignore_leftover_process(const char *comm
) {
5972 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5975 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5976 _cleanup_free_
char *comm
= NULL
;
5978 (void) get_process_comm(pid
, &comm
);
5980 if (ignore_leftover_process(comm
))
5983 /* During start we print a warning */
5985 log_unit_warning(userdata
,
5986 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5987 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5993 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5994 _cleanup_free_
char *comm
= NULL
;
5996 (void) get_process_comm(pid
, &comm
);
5998 if (ignore_leftover_process(comm
))
6001 /* During stop we only print an informational message */
6003 log_unit_info(userdata
,
6004 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
6010 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
6013 (void) unit_pick_cgroup_path(u
);
6015 if (!u
->cgroup_path
)
6018 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
6021 bool unit_needs_console(Unit
*u
) {
6023 UnitActiveState state
;
6027 state
= unit_active_state(u
);
6029 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
6032 if (UNIT_VTABLE(u
)->needs_console
)
6033 return UNIT_VTABLE(u
)->needs_console(u
);
6035 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
6036 ec
= unit_get_exec_context(u
);
6040 return exec_context_may_touch_console(ec
);
6043 const char *unit_label_path(const Unit
*u
) {
6048 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
6049 * when validating access checks. */
6051 p
= u
->source_path
?: u
->fragment_path
;
6055 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
6056 if (null_or_empty_path(p
) > 0)
6062 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
6067 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
6068 * and not a kernel thread either */
6070 /* First, a simple range check */
6071 if (!pid_is_valid(pid
))
6072 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
6074 /* Some extra safety check */
6075 if (pid
== 1 || pid
== getpid_cached())
6076 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
6078 /* Don't even begin to bother with kernel threads */
6079 r
= is_kernel_thread(pid
);
6081 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
6083 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
6085 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
6090 void unit_log_success(Unit
*u
) {
6093 log_struct(LOG_INFO
,
6094 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
6096 LOG_UNIT_INVOCATION_ID(u
),
6097 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
6100 void unit_log_failure(Unit
*u
, const char *result
) {
6104 log_struct(LOG_WARNING
,
6105 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
6107 LOG_UNIT_INVOCATION_ID(u
),
6108 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
6109 "UNIT_RESULT=%s", result
);
6112 void unit_log_skip(Unit
*u
, const char *result
) {
6116 log_struct(LOG_INFO
,
6117 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
6119 LOG_UNIT_INVOCATION_ID(u
),
6120 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
6121 "UNIT_RESULT=%s", result
);
6124 void unit_log_process_exit(
6127 const char *command
,
6137 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
6138 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
6139 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
6143 else if (code
== CLD_EXITED
)
6146 level
= LOG_WARNING
;
6149 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
6150 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s",
6152 sigchld_code_to_string(code
), status
,
6153 strna(code
== CLD_EXITED
6154 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
6155 : signal_to_string(status
))),
6156 "EXIT_CODE=%s", sigchld_code_to_string(code
),
6157 "EXIT_STATUS=%i", status
,
6158 "COMMAND=%s", strna(command
),
6160 LOG_UNIT_INVOCATION_ID(u
));
6163 int unit_exit_status(Unit
*u
) {
6166 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
6167 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
6168 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
6169 * service process has exited abnormally (signal/coredump). */
6171 if (!UNIT_VTABLE(u
)->exit_status
)
6174 return UNIT_VTABLE(u
)->exit_status(u
);
6177 int unit_failure_action_exit_status(Unit
*u
) {
6182 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
6184 if (u
->failure_action_exit_status
>= 0)
6185 return u
->failure_action_exit_status
;
6187 r
= unit_exit_status(u
);
6188 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
6194 int unit_success_action_exit_status(Unit
*u
) {
6199 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
6201 if (u
->success_action_exit_status
>= 0)
6202 return u
->success_action_exit_status
;
6204 r
= unit_exit_status(u
);
6205 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
6211 int unit_test_trigger_loaded(Unit
*u
) {
6214 /* Tests whether the unit to trigger is loaded */
6216 trigger
= UNIT_TRIGGER(u
);
6218 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
6219 "Refusing to start, no unit to trigger.");
6220 if (trigger
->load_state
!= UNIT_LOADED
)
6221 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
6222 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
6227 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
6231 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
6232 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
6233 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
6235 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
6238 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
6239 UnitActiveState state
;
6243 /* Special return values:
6245 * -EOPNOTSUPP → cleaning not supported for this unit type
6246 * -EUNATCH → cleaning not defined for this resource type
6247 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
6248 * a job queued or similar
6251 if (!UNIT_VTABLE(u
)->clean
)
6257 if (u
->load_state
!= UNIT_LOADED
)
6263 state
= unit_active_state(u
);
6264 if (!IN_SET(state
, UNIT_INACTIVE
))
6267 return UNIT_VTABLE(u
)->clean(u
, mask
);
6270 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
6273 if (!UNIT_VTABLE(u
)->clean
||
6274 u
->load_state
!= UNIT_LOADED
) {
6279 /* When the clean() method is set, can_clean() really should be set too */
6280 assert(UNIT_VTABLE(u
)->can_clean
);
6282 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
6285 bool unit_can_freeze(Unit
*u
) {
6288 if (UNIT_VTABLE(u
)->can_freeze
)
6289 return UNIT_VTABLE(u
)->can_freeze(u
);
6291 return UNIT_VTABLE(u
)->freeze
;
6294 void unit_frozen(Unit
*u
) {
6297 u
->freezer_state
= FREEZER_FROZEN
;
6299 bus_unit_send_pending_freezer_message(u
);
6302 void unit_thawed(Unit
*u
) {
6305 u
->freezer_state
= FREEZER_RUNNING
;
6307 bus_unit_send_pending_freezer_message(u
);
6310 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
6312 int (*method
)(Unit
*);
6316 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
6318 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
6319 if (!method
|| !cg_freezer_supported())
6325 if (u
->load_state
!= UNIT_LOADED
)
6328 s
= unit_active_state(u
);
6329 if (s
!= UNIT_ACTIVE
)
6332 if (IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
))
6342 int unit_freeze(Unit
*u
) {
6343 return unit_freezer_action(u
, FREEZER_FREEZE
);
6346 int unit_thaw(Unit
*u
) {
6347 return unit_freezer_action(u
, FREEZER_THAW
);
6350 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
6351 int unit_freeze_vtable_common(Unit
*u
) {
6352 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
6355 int unit_thaw_vtable_common(Unit
*u
) {
6356 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
6359 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
6360 [COLLECT_INACTIVE
] = "inactive",
6361 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
6364 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);