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a016b922 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <signal.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "unit.h" | |
27 | #include "slice.h" | |
28 | #include "load-fragment.h" | |
29 | #include "log.h" | |
30 | #include "dbus-slice.h" | |
31 | #include "special.h" | |
32 | #include "unit-name.h" | |
33 | ||
34 | static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = { | |
35 | [SLICE_DEAD] = UNIT_INACTIVE, | |
36 | [SLICE_ACTIVE] = UNIT_ACTIVE | |
37 | }; | |
38 | ||
39 | static void slice_set_state(Slice *t, SliceState state) { | |
40 | SliceState old_state; | |
41 | assert(t); | |
42 | ||
43 | old_state = t->state; | |
44 | t->state = state; | |
45 | ||
46 | if (state != old_state) | |
47 | log_debug("%s changed %s -> %s", | |
48 | UNIT(t)->id, | |
49 | slice_state_to_string(old_state), | |
50 | slice_state_to_string(state)); | |
51 | ||
52 | unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true); | |
53 | } | |
54 | ||
4ad49000 | 55 | static int slice_add_parent_slice(Slice *s) { |
a016b922 | 56 | char *a, *dash; |
a016b922 | 57 | Unit *parent; |
4ad49000 | 58 | int r; |
a016b922 LP |
59 | |
60 | assert(s); | |
61 | ||
4ad49000 | 62 | if (UNIT_ISSET(UNIT(s)->slice)) |
a016b922 LP |
63 | return 0; |
64 | ||
4ad49000 | 65 | if (unit_has_name(UNIT(s), SPECIAL_ROOT_SLICE)) |
a016b922 LP |
66 | return 0; |
67 | ||
4ad49000 LP |
68 | a = strdupa(UNIT(s)->id); |
69 | dash = strrchr(a, '-'); | |
70 | if (dash) | |
71 | strcpy(dash, ".slice"); | |
72 | else | |
73 | a = (char*) SPECIAL_ROOT_SLICE; | |
a016b922 LP |
74 | |
75 | r = manager_load_unit(UNIT(s)->manager, a, NULL, NULL, &parent); | |
76 | if (r < 0) | |
77 | return r; | |
78 | ||
79 | unit_ref_set(&UNIT(s)->slice, parent); | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static int slice_add_default_dependencies(Slice *s) { | |
84 | int r; | |
85 | ||
86 | assert(s); | |
87 | ||
88 | /* Make sure slices are unloaded on shutdown */ | |
6c12b52e LP |
89 | r = unit_add_two_dependencies_by_name( |
90 | UNIT(s), | |
91 | UNIT_BEFORE, UNIT_CONFLICTS, | |
92 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
a016b922 LP |
93 | if (r < 0) |
94 | return r; | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int slice_verify(Slice *s) { | |
100 | assert(s); | |
101 | ||
102 | if (UNIT(s)->load_state != UNIT_LOADED) | |
103 | return 0; | |
104 | ||
105 | if (UNIT_DEREF(UNIT(s)->slice)) { | |
106 | char *a, *dash; | |
107 | ||
108 | a = strdupa(UNIT(s)->id); | |
109 | dash = strrchr(a, '-'); | |
4ad49000 | 110 | if (dash) |
a016b922 | 111 | strcpy(dash, ".slice"); |
4ad49000 LP |
112 | else |
113 | a = (char*) SPECIAL_ROOT_SLICE; | |
a016b922 | 114 | |
4ad49000 | 115 | if (!unit_has_name(UNIT_DEREF(UNIT(s)->slice), a)) { |
79008bdd | 116 | log_unit_error(UNIT(s)->id, |
4ad49000 LP |
117 | "%s located outside its parent slice. Refusing.", UNIT(s)->id); |
118 | return -EINVAL; | |
a016b922 LP |
119 | } |
120 | } | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int slice_load(Unit *u) { | |
126 | Slice *s = SLICE(u); | |
127 | int r; | |
128 | ||
129 | assert(s); | |
130 | ||
4ad49000 | 131 | r = unit_load_fragment_and_dropin_optional(u); |
a016b922 LP |
132 | if (r < 0) |
133 | return r; | |
134 | ||
135 | /* This is a new unit? Then let's add in some extras */ | |
136 | if (u->load_state == UNIT_LOADED) { | |
137 | ||
598459ce LP |
138 | r = unit_patch_contexts(u); |
139 | if (r < 0) | |
140 | return r; | |
141 | ||
4ad49000 | 142 | r = slice_add_parent_slice(s); |
a016b922 LP |
143 | if (r < 0) |
144 | return r; | |
145 | ||
146 | if (u->default_dependencies) { | |
147 | r = slice_add_default_dependencies(s); | |
148 | if (r < 0) | |
149 | return r; | |
150 | } | |
a016b922 LP |
151 | } |
152 | ||
153 | return slice_verify(s); | |
154 | } | |
155 | ||
156 | static int slice_coldplug(Unit *u) { | |
157 | Slice *t = SLICE(u); | |
158 | ||
159 | assert(t); | |
160 | assert(t->state == SLICE_DEAD); | |
161 | ||
162 | if (t->deserialized_state != t->state) | |
163 | slice_set_state(t, t->deserialized_state); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static void slice_dump(Unit *u, FILE *f, const char *prefix) { | |
169 | Slice *t = SLICE(u); | |
170 | ||
171 | assert(t); | |
172 | assert(f); | |
173 | ||
174 | fprintf(f, | |
175 | "%sSlice State: %s\n", | |
176 | prefix, slice_state_to_string(t->state)); | |
4ad49000 LP |
177 | |
178 | cgroup_context_dump(&t->cgroup_context, f, prefix); | |
a016b922 LP |
179 | } |
180 | ||
181 | static int slice_start(Unit *u) { | |
182 | Slice *t = SLICE(u); | |
a016b922 LP |
183 | |
184 | assert(t); | |
185 | assert(t->state == SLICE_DEAD); | |
186 | ||
4ad49000 | 187 | unit_realize_cgroup(u); |
a016b922 LP |
188 | |
189 | slice_set_state(t, SLICE_ACTIVE); | |
82a2b6bb | 190 | return 1; |
a016b922 LP |
191 | } |
192 | ||
193 | static int slice_stop(Unit *u) { | |
194 | Slice *t = SLICE(u); | |
195 | ||
196 | assert(t); | |
197 | assert(t->state == SLICE_ACTIVE); | |
198 | ||
4ad49000 LP |
199 | /* We do not need to destroy the cgroup explicitly, |
200 | * unit_notify() will do that for us anyway. */ | |
a016b922 LP |
201 | |
202 | slice_set_state(t, SLICE_DEAD); | |
82a2b6bb | 203 | return 1; |
a016b922 LP |
204 | } |
205 | ||
718db961 | 206 | static int slice_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
a016b922 LP |
207 | return unit_kill_common(u, who, signo, -1, -1, error); |
208 | } | |
209 | ||
210 | static int slice_serialize(Unit *u, FILE *f, FDSet *fds) { | |
211 | Slice *s = SLICE(u); | |
212 | ||
213 | assert(s); | |
214 | assert(f); | |
215 | assert(fds); | |
216 | ||
217 | unit_serialize_item(u, f, "state", slice_state_to_string(s->state)); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static int slice_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
222 | Slice *s = SLICE(u); | |
223 | ||
224 | assert(u); | |
225 | assert(key); | |
226 | assert(value); | |
227 | assert(fds); | |
228 | ||
229 | if (streq(key, "state")) { | |
230 | SliceState state; | |
231 | ||
232 | state = slice_state_from_string(value); | |
233 | if (state < 0) | |
234 | log_debug("Failed to parse state value %s", value); | |
235 | else | |
236 | s->deserialized_state = state; | |
237 | ||
238 | } else | |
239 | log_debug("Unknown serialization key '%s'", key); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | _pure_ static UnitActiveState slice_active_state(Unit *u) { | |
245 | assert(u); | |
246 | ||
247 | return state_translation_table[SLICE(u)->state]; | |
248 | } | |
249 | ||
250 | _pure_ static const char *slice_sub_state_to_string(Unit *u) { | |
251 | assert(u); | |
252 | ||
253 | return slice_state_to_string(SLICE(u)->state); | |
254 | } | |
255 | ||
256 | static const char* const slice_state_table[_SLICE_STATE_MAX] = { | |
257 | [SLICE_DEAD] = "dead", | |
258 | [SLICE_ACTIVE] = "active" | |
259 | }; | |
260 | ||
261 | DEFINE_STRING_TABLE_LOOKUP(slice_state, SliceState); | |
262 | ||
263 | const UnitVTable slice_vtable = { | |
264 | .object_size = sizeof(Slice), | |
718db961 LP |
265 | .cgroup_context_offset = offsetof(Slice, cgroup_context), |
266 | ||
a016b922 LP |
267 | .sections = |
268 | "Unit\0" | |
269 | "Slice\0" | |
270 | "Install\0", | |
4ad49000 | 271 | .private_section = "Slice", |
4ad49000 | 272 | |
a016b922 LP |
273 | .no_alias = true, |
274 | .no_instances = true, | |
275 | ||
276 | .load = slice_load, | |
4ad49000 | 277 | |
a016b922 LP |
278 | .coldplug = slice_coldplug, |
279 | ||
280 | .dump = slice_dump, | |
281 | ||
282 | .start = slice_start, | |
283 | .stop = slice_stop, | |
284 | ||
285 | .kill = slice_kill, | |
286 | ||
287 | .serialize = slice_serialize, | |
288 | .deserialize_item = slice_deserialize_item, | |
289 | ||
290 | .active_state = slice_active_state, | |
291 | .sub_state_to_string = slice_sub_state_to_string, | |
292 | ||
293 | .bus_interface = "org.freedesktop.systemd1.Slice", | |
718db961 | 294 | .bus_vtable = bus_slice_vtable, |
8e2af478 LP |
295 | .bus_set_property = bus_slice_set_property, |
296 | .bus_commit_properties = bus_slice_commit_properties, | |
a016b922 LP |
297 | |
298 | .status_message_formats = { | |
299 | .finished_start_job = { | |
4ad49000 | 300 | [JOB_DONE] = "Created slice %s.", |
a016b922 LP |
301 | [JOB_DEPENDENCY] = "Dependency failed for %s.", |
302 | }, | |
303 | .finished_stop_job = { | |
4ad49000 | 304 | [JOB_DONE] = "Removed slice %s.", |
a016b922 LP |
305 | }, |
306 | }, | |
307 | }; |