1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include "unit-name.h"
30 #include "dbus-slice.h"
32 static const UnitActiveState state_translation_table
[_SLICE_STATE_MAX
] = {
33 [SLICE_DEAD
] = UNIT_INACTIVE
,
34 [SLICE_ACTIVE
] = UNIT_ACTIVE
37 static void slice_set_state(Slice
*t
, SliceState state
) {
44 if (state
!= old_state
)
45 log_debug("%s changed %s -> %s",
47 slice_state_to_string(old_state
),
48 slice_state_to_string(state
));
50 unit_notify(UNIT(t
), state_translation_table
[old_state
], state_translation_table
[state
], true);
53 static int slice_add_parent_slice(Slice
*s
) {
60 if (UNIT_ISSET(UNIT(s
)->slice
))
63 if (unit_has_name(UNIT(s
), SPECIAL_ROOT_SLICE
))
66 a
= strdupa(UNIT(s
)->id
);
67 dash
= strrchr(a
, '-');
69 strcpy(dash
, ".slice");
71 a
= (char*) SPECIAL_ROOT_SLICE
;
73 r
= manager_load_unit(UNIT(s
)->manager
, a
, NULL
, NULL
, &parent
);
77 unit_ref_set(&UNIT(s
)->slice
, parent
);
81 static int slice_add_default_dependencies(Slice
*s
) {
86 /* Make sure slices are unloaded on shutdown */
87 r
= unit_add_two_dependencies_by_name(
89 UNIT_BEFORE
, UNIT_CONFLICTS
,
90 SPECIAL_SHUTDOWN_TARGET
, NULL
, true);
98 static int slice_verify(Slice
*s
) {
99 _cleanup_free_
char *parent
= NULL
;
104 if (UNIT(s
)->load_state
!= UNIT_LOADED
)
107 if (!slice_name_is_valid(UNIT(s
)->id
)) {
108 log_unit_error(UNIT(s
), "Slice name %s is not valid. Refusing.", UNIT(s
)->id
);
112 r
= slice_build_parent_slice(UNIT(s
)->id
, &parent
);
114 return log_unit_error_errno(UNIT(s
), r
, "Failed to determine parent slice: %m");
116 if (parent
? !unit_has_name(UNIT_DEREF(UNIT(s
)->slice
), parent
) : UNIT_ISSET(UNIT(s
)->slice
)) {
117 log_unit_error(UNIT(s
), "Located outside of parent slice. Refusing.");
124 static int slice_load(Unit
*u
) {
130 r
= unit_load_fragment_and_dropin_optional(u
);
134 /* This is a new unit? Then let's add in some extras */
135 if (u
->load_state
== UNIT_LOADED
) {
137 r
= unit_patch_contexts(u
);
141 r
= slice_add_parent_slice(s
);
145 if (u
->default_dependencies
) {
146 r
= slice_add_default_dependencies(s
);
152 return slice_verify(s
);
155 static int slice_coldplug(Unit
*u
) {
159 assert(t
->state
== SLICE_DEAD
);
161 if (t
->deserialized_state
!= t
->state
)
162 slice_set_state(t
, t
->deserialized_state
);
167 static void slice_dump(Unit
*u
, FILE *f
, const char *prefix
) {
174 "%sSlice State: %s\n",
175 prefix
, slice_state_to_string(t
->state
));
177 cgroup_context_dump(&t
->cgroup_context
, f
, prefix
);
180 static int slice_start(Unit
*u
) {
184 assert(t
->state
== SLICE_DEAD
);
186 (void) unit_realize_cgroup(u
);
187 (void) unit_reset_cpu_usage(u
);
189 slice_set_state(t
, SLICE_ACTIVE
);
193 static int slice_stop(Unit
*u
) {
197 assert(t
->state
== SLICE_ACTIVE
);
199 /* We do not need to destroy the cgroup explicitly,
200 * unit_notify() will do that for us anyway. */
202 slice_set_state(t
, SLICE_DEAD
);
206 static int slice_kill(Unit
*u
, KillWho who
, int signo
, sd_bus_error
*error
) {
207 return unit_kill_common(u
, who
, signo
, -1, -1, error
);
210 static int slice_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
217 unit_serialize_item(u
, f
, "state", slice_state_to_string(s
->state
));
221 static int slice_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
229 if (streq(key
, "state")) {
232 state
= slice_state_from_string(value
);
234 log_debug("Failed to parse state value %s", value
);
236 s
->deserialized_state
= state
;
239 log_debug("Unknown serialization key '%s'", key
);
244 _pure_
static UnitActiveState
slice_active_state(Unit
*u
) {
247 return state_translation_table
[SLICE(u
)->state
];
250 _pure_
static const char *slice_sub_state_to_string(Unit
*u
) {
253 return slice_state_to_string(SLICE(u
)->state
);
256 static int slice_enumerate(Manager
*m
) {
262 u
= manager_get_unit(m
, SPECIAL_ROOT_SLICE
);
264 u
= unit_new(m
, sizeof(Slice
));
268 r
= unit_add_name(u
, SPECIAL_ROOT_SLICE
);
271 return log_error_errno(r
, "Failed to add -.slice name");
275 u
->default_dependencies
= false;
277 SLICE(u
)->deserialized_state
= SLICE_ACTIVE
;
280 u
->description
= strdup("Root Slice");
281 if (!u
->documentation
)
282 (void) strv_extend(&u
->documentation
, "man:systemd.special(7)");
284 unit_add_to_load_queue(u
);
285 unit_add_to_dbus_queue(u
);
290 const UnitVTable slice_vtable
= {
291 .object_size
= sizeof(Slice
),
292 .cgroup_context_offset
= offsetof(Slice
, cgroup_context
),
298 .private_section
= "Slice",
301 .no_instances
= true,
305 .coldplug
= slice_coldplug
,
309 .start
= slice_start
,
314 .serialize
= slice_serialize
,
315 .deserialize_item
= slice_deserialize_item
,
317 .active_state
= slice_active_state
,
318 .sub_state_to_string
= slice_sub_state_to_string
,
320 .bus_vtable
= bus_slice_vtable
,
321 .bus_set_property
= bus_slice_set_property
,
322 .bus_commit_properties
= bus_slice_commit_properties
,
324 .enumerate
= slice_enumerate
,
326 .status_message_formats
= {
327 .finished_start_job
= {
328 [JOB_DONE
] = "Created slice %s.",
330 .finished_stop_job
= {
331 [JOB_DONE
] = "Removed slice %s.",