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6c12b52e 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> | |
6c12b52e LP |
23 | #include <unistd.h> |
24 | ||
25 | #include "unit.h" | |
26 | #include "scope.h" | |
6c12b52e LP |
27 | #include "log.h" |
28 | #include "dbus-scope.h" | |
29 | #include "special.h" | |
30 | #include "unit-name.h" | |
31 | #include "load-dropin.h" | |
32 | ||
33 | static const UnitActiveState state_translation_table[_SCOPE_STATE_MAX] = { | |
34 | [SCOPE_DEAD] = UNIT_INACTIVE, | |
35 | [SCOPE_RUNNING] = UNIT_ACTIVE, | |
a911bb9a | 36 | [SCOPE_ABANDONED] = UNIT_ACTIVE, |
6c12b52e LP |
37 | [SCOPE_STOP_SIGTERM] = UNIT_DEACTIVATING, |
38 | [SCOPE_STOP_SIGKILL] = UNIT_DEACTIVATING, | |
39 | [SCOPE_FAILED] = UNIT_FAILED | |
40 | }; | |
41 | ||
718db961 LP |
42 | static int scope_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
43 | ||
6c12b52e LP |
44 | static void scope_init(Unit *u) { |
45 | Scope *s = SCOPE(u); | |
46 | ||
47 | assert(u); | |
48 | assert(u->load_state == UNIT_STUB); | |
49 | ||
1f19a534 | 50 | s->timeout_stop_usec = u->manager->default_timeout_stop_usec; |
6c12b52e | 51 | |
6c12b52e LP |
52 | UNIT(s)->ignore_on_isolate = true; |
53 | UNIT(s)->ignore_on_snapshot = true; | |
54 | } | |
55 | ||
56 | static void scope_done(Unit *u) { | |
57 | Scope *s = SCOPE(u); | |
58 | ||
59 | assert(u); | |
60 | ||
2d4a39e7 LP |
61 | free(s->controller); |
62 | ||
718db961 LP |
63 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
64 | } | |
65 | ||
66 | static int scope_arm_timer(Scope *s) { | |
67 | int r; | |
68 | ||
69 | assert(s); | |
70 | ||
71 | if (s->timeout_stop_usec <= 0) { | |
72 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
73 | return 0; | |
74 | } | |
75 | ||
76 | if (s->timer_event_source) { | |
77 | r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_stop_usec); | |
78 | if (r < 0) | |
79 | return r; | |
80 | ||
81 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
82 | } | |
83 | ||
6a0f1f6d LP |
84 | return sd_event_add_time( |
85 | UNIT(s)->manager->event, | |
86 | &s->timer_event_source, | |
87 | CLOCK_MONOTONIC, | |
88 | now(CLOCK_MONOTONIC) + s->timeout_stop_usec, 0, | |
89 | scope_dispatch_timer, s); | |
6c12b52e LP |
90 | } |
91 | ||
92 | static void scope_set_state(Scope *s, ScopeState state) { | |
93 | ScopeState old_state; | |
94 | assert(s); | |
95 | ||
96 | old_state = s->state; | |
97 | s->state = state; | |
98 | ||
a911bb9a | 99 | if (!IN_SET(state, SCOPE_STOP_SIGTERM, SCOPE_STOP_SIGKILL)) |
718db961 | 100 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
6c12b52e | 101 | |
a911bb9a LP |
102 | if (IN_SET(state, SCOPE_DEAD, SCOPE_FAILED)) |
103 | unit_unwatch_all_pids(UNIT(s)); | |
104 | ||
6c12b52e | 105 | if (state != old_state) |
a911bb9a | 106 | log_debug("%s changed %s -> %s", UNIT(s)->id, scope_state_to_string(old_state), scope_state_to_string(state)); |
6c12b52e LP |
107 | |
108 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); | |
109 | } | |
110 | ||
111 | static int scope_add_default_dependencies(Scope *s) { | |
112 | int r; | |
113 | ||
114 | assert(s); | |
115 | ||
116 | /* Make sure scopes are unloaded on shutdown */ | |
117 | r = unit_add_two_dependencies_by_name( | |
118 | UNIT(s), | |
119 | UNIT_BEFORE, UNIT_CONFLICTS, | |
120 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
121 | if (r < 0) | |
122 | return r; | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static int scope_verify(Scope *s) { | |
128 | assert(s); | |
129 | ||
130 | if (UNIT(s)->load_state != UNIT_LOADED) | |
131 | return 0; | |
132 | ||
a911bb9a | 133 | if (set_isempty(UNIT(s)->pids) && UNIT(s)->manager->n_reloading <= 0) { |
79008bdd | 134 | log_unit_error(UNIT(s)->id, "Scope %s has no PIDs. Refusing.", UNIT(s)->id); |
6c12b52e LP |
135 | return -EINVAL; |
136 | } | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static int scope_load(Unit *u) { | |
142 | Scope *s = SCOPE(u); | |
143 | int r; | |
144 | ||
145 | assert(s); | |
146 | assert(u->load_state == UNIT_STUB); | |
147 | ||
148 | if (!u->transient && UNIT(s)->manager->n_reloading <= 0) | |
149 | return -ENOENT; | |
150 | ||
151 | u->load_state = UNIT_LOADED; | |
152 | ||
153 | r = unit_load_dropin(u); | |
154 | if (r < 0) | |
155 | return r; | |
156 | ||
598459ce LP |
157 | r = unit_patch_contexts(u); |
158 | if (r < 0) | |
159 | return r; | |
160 | ||
161 | r = unit_add_default_slice(u, &s->cgroup_context); | |
6c12b52e LP |
162 | if (r < 0) |
163 | return r; | |
164 | ||
165 | if (u->default_dependencies) { | |
166 | r = scope_add_default_dependencies(s); | |
167 | if (r < 0) | |
168 | return r; | |
169 | } | |
170 | ||
171 | return scope_verify(s); | |
172 | } | |
173 | ||
be847e82 | 174 | static int scope_coldplug(Unit *u) { |
6c12b52e LP |
175 | Scope *s = SCOPE(u); |
176 | int r; | |
177 | ||
178 | assert(s); | |
179 | assert(s->state == SCOPE_DEAD); | |
180 | ||
181 | if (s->deserialized_state != s->state) { | |
182 | ||
a911bb9a | 183 | if (IN_SET(s->deserialized_state, SCOPE_STOP_SIGKILL, SCOPE_STOP_SIGTERM)) { |
718db961 | 184 | r = scope_arm_timer(s); |
6c12b52e | 185 | if (r < 0) |
6c12b52e LP |
186 | return r; |
187 | } | |
188 | ||
a911bb9a LP |
189 | if (!IN_SET(s->deserialized_state, SCOPE_DEAD, SCOPE_FAILED)) |
190 | unit_watch_all_pids(UNIT(s)); | |
191 | ||
6c12b52e LP |
192 | scope_set_state(s, s->deserialized_state); |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static void scope_dump(Unit *u, FILE *f, const char *prefix) { | |
199 | Scope *s = SCOPE(u); | |
200 | ||
201 | assert(s); | |
202 | assert(f); | |
203 | ||
204 | fprintf(f, | |
205 | "%sScope State: %s\n" | |
206 | "%sResult: %s\n", | |
207 | prefix, scope_state_to_string(s->state), | |
208 | prefix, scope_result_to_string(s->result)); | |
209 | ||
210 | cgroup_context_dump(&s->cgroup_context, f, prefix); | |
211 | kill_context_dump(&s->kill_context, f, prefix); | |
212 | } | |
213 | ||
214 | static void scope_enter_dead(Scope *s, ScopeResult f) { | |
215 | assert(s); | |
216 | ||
217 | if (f != SCOPE_SUCCESS) | |
218 | s->result = f; | |
219 | ||
220 | scope_set_state(s, s->result != SCOPE_SUCCESS ? SCOPE_FAILED : SCOPE_DEAD); | |
221 | } | |
222 | ||
223 | static void scope_enter_signal(Scope *s, ScopeState state, ScopeResult f) { | |
2d4a39e7 | 224 | bool skip_signal = false; |
6c12b52e LP |
225 | int r; |
226 | ||
227 | assert(s); | |
228 | ||
229 | if (f != SCOPE_SUCCESS) | |
230 | s->result = f; | |
231 | ||
a911bb9a LP |
232 | unit_watch_all_pids(UNIT(s)); |
233 | ||
2d4a39e7 LP |
234 | /* If we have a controller set let's ask the controller nicely |
235 | * to terminate the scope, instead of us going directly into | |
236 | * SIGTERM beserk mode */ | |
237 | if (state == SCOPE_STOP_SIGTERM) | |
238 | skip_signal = bus_scope_send_request_stop(s) > 0; | |
239 | ||
240 | if (!skip_signal) { | |
241 | r = unit_kill_context( | |
242 | UNIT(s), | |
243 | &s->kill_context, | |
db2cb23b | 244 | state != SCOPE_STOP_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
2d4a39e7 LP |
245 | -1, -1, false); |
246 | if (r < 0) | |
247 | goto fail; | |
248 | } else | |
249 | r = 1; | |
6c12b52e LP |
250 | |
251 | if (r > 0) { | |
718db961 LP |
252 | r = scope_arm_timer(s); |
253 | if (r < 0) | |
254 | goto fail; | |
6c12b52e LP |
255 | |
256 | scope_set_state(s, state); | |
ac84d1fb LP |
257 | } else if (state == SCOPE_STOP_SIGTERM) |
258 | scope_enter_signal(s, SCOPE_STOP_SIGKILL, SCOPE_SUCCESS); | |
259 | else | |
6c12b52e LP |
260 | scope_enter_dead(s, SCOPE_SUCCESS); |
261 | ||
262 | return; | |
263 | ||
264 | fail: | |
79008bdd | 265 | log_unit_warning(UNIT(s)->id, |
6c12b52e LP |
266 | "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); |
267 | ||
268 | scope_enter_dead(s, SCOPE_FAILURE_RESOURCES); | |
269 | } | |
270 | ||
271 | static int scope_start(Unit *u) { | |
272 | Scope *s = SCOPE(u); | |
273 | int r; | |
274 | ||
275 | assert(s); | |
276 | ||
7b617155 LP |
277 | if (s->state == SCOPE_FAILED) |
278 | return -EPERM; | |
279 | ||
6c12b52e LP |
280 | if (s->state == SCOPE_STOP_SIGTERM || |
281 | s->state == SCOPE_STOP_SIGKILL) | |
282 | return -EAGAIN; | |
283 | ||
284 | assert(s->state == SCOPE_DEAD); | |
285 | ||
286 | if (!u->transient && UNIT(s)->manager->n_reloading <= 0) | |
287 | return -ENOENT; | |
288 | ||
5ad096b3 LP |
289 | (void) unit_realize_cgroup(u); |
290 | (void) unit_reset_cpu_usage(u); | |
291 | ||
7b3fd631 | 292 | r = unit_attach_pids_to_cgroup(u); |
6c12b52e LP |
293 | if (r < 0) |
294 | return r; | |
295 | ||
6c12b52e LP |
296 | s->result = SCOPE_SUCCESS; |
297 | ||
298 | scope_set_state(s, SCOPE_RUNNING); | |
82a2b6bb | 299 | return 1; |
6c12b52e LP |
300 | } |
301 | ||
302 | static int scope_stop(Unit *u) { | |
303 | Scope *s = SCOPE(u); | |
304 | ||
305 | assert(s); | |
6c12b52e LP |
306 | |
307 | if (s->state == SCOPE_STOP_SIGTERM || | |
308 | s->state == SCOPE_STOP_SIGKILL) | |
309 | return 0; | |
310 | ||
a911bb9a LP |
311 | assert(s->state == SCOPE_RUNNING || |
312 | s->state == SCOPE_ABANDONED); | |
6c12b52e LP |
313 | |
314 | scope_enter_signal(s, SCOPE_STOP_SIGTERM, SCOPE_SUCCESS); | |
82a2b6bb | 315 | return 1; |
6c12b52e LP |
316 | } |
317 | ||
8bcca7e2 LP |
318 | static void scope_reset_failed(Unit *u) { |
319 | Scope *s = SCOPE(u); | |
320 | ||
321 | assert(s); | |
322 | ||
323 | if (s->state == SCOPE_FAILED) | |
324 | scope_set_state(s, SCOPE_DEAD); | |
325 | ||
326 | s->result = SCOPE_SUCCESS; | |
327 | } | |
328 | ||
718db961 | 329 | static int scope_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
6c12b52e LP |
330 | return unit_kill_common(u, who, signo, -1, -1, error); |
331 | } | |
332 | ||
68db7a3b ZJS |
333 | static int scope_get_timeout(Unit *u, uint64_t *timeout) { |
334 | Scope *s = SCOPE(u); | |
335 | int r; | |
336 | ||
337 | if (!s->timer_event_source) | |
338 | return 0; | |
339 | ||
340 | r = sd_event_source_get_time(s->timer_event_source, timeout); | |
341 | if (r < 0) | |
342 | return r; | |
343 | ||
344 | return 1; | |
345 | } | |
346 | ||
6c12b52e LP |
347 | static int scope_serialize(Unit *u, FILE *f, FDSet *fds) { |
348 | Scope *s = SCOPE(u); | |
349 | ||
350 | assert(s); | |
351 | assert(f); | |
352 | assert(fds); | |
353 | ||
354 | unit_serialize_item(u, f, "state", scope_state_to_string(s->state)); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static int scope_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
359 | Scope *s = SCOPE(u); | |
360 | ||
361 | assert(u); | |
362 | assert(key); | |
363 | assert(value); | |
364 | assert(fds); | |
365 | ||
366 | if (streq(key, "state")) { | |
367 | ScopeState state; | |
368 | ||
369 | state = scope_state_from_string(value); | |
370 | if (state < 0) | |
371 | log_debug("Failed to parse state value %s", value); | |
372 | else | |
373 | s->deserialized_state = state; | |
374 | ||
375 | } else | |
376 | log_debug("Unknown serialization key '%s'", key); | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static bool scope_check_gc(Unit *u) { | |
4e2744fc | 382 | assert(u); |
6c12b52e LP |
383 | |
384 | /* Never clean up scopes that still have a process around, | |
385 | * even if the scope is formally dead. */ | |
386 | ||
a911bb9a | 387 | if (u->cgroup_path) { |
4e2744fc RC |
388 | int r; |
389 | ||
a911bb9a | 390 | r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true); |
6c12b52e LP |
391 | if (r <= 0) |
392 | return true; | |
393 | } | |
394 | ||
395 | return false; | |
396 | } | |
397 | ||
a911bb9a LP |
398 | static void scope_notify_cgroup_empty_event(Unit *u) { |
399 | Scope *s = SCOPE(u); | |
400 | assert(u); | |
401 | ||
79008bdd | 402 | log_unit_debug(u->id, "%s: cgroup is empty", u->id); |
a911bb9a LP |
403 | |
404 | if (IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED, SCOPE_STOP_SIGTERM, SCOPE_STOP_SIGKILL)) | |
405 | scope_enter_dead(s, SCOPE_SUCCESS); | |
406 | } | |
407 | ||
408 | static void scope_sigchld_event(Unit *u, pid_t pid, int code, int status) { | |
409 | ||
410 | /* If we get a SIGCHLD event for one of the processes we were | |
411 | interested in, then we look for others to watch, under the | |
412 | assumption that we'll sooner or later get a SIGCHLD for | |
413 | them, as the original process we watched was probably the | |
414 | parent of them, and they are hence now our children. */ | |
415 | ||
416 | unit_tidy_watch_pids(u, 0, 0); | |
417 | unit_watch_all_pids(u); | |
418 | ||
419 | /* If the PID set is empty now, then let's finish this off */ | |
420 | if (set_isempty(u->pids)) | |
421 | scope_notify_cgroup_empty_event(u); | |
422 | } | |
423 | ||
718db961 LP |
424 | static int scope_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
425 | Scope *s = SCOPE(userdata); | |
6c12b52e LP |
426 | |
427 | assert(s); | |
718db961 | 428 | assert(s->timer_event_source == source); |
6c12b52e LP |
429 | |
430 | switch (s->state) { | |
431 | ||
432 | case SCOPE_STOP_SIGTERM: | |
433 | if (s->kill_context.send_sigkill) { | |
79008bdd | 434 | log_unit_warning(UNIT(s)->id, "%s stopping timed out. Killing.", UNIT(s)->id); |
6c12b52e LP |
435 | scope_enter_signal(s, SCOPE_STOP_SIGKILL, SCOPE_FAILURE_TIMEOUT); |
436 | } else { | |
79008bdd | 437 | log_unit_warning(UNIT(s)->id, "%s stopping timed out. Skipping SIGKILL.", UNIT(s)->id); |
6c12b52e LP |
438 | scope_enter_dead(s, SCOPE_FAILURE_TIMEOUT); |
439 | } | |
440 | ||
441 | break; | |
442 | ||
443 | case SCOPE_STOP_SIGKILL: | |
79008bdd | 444 | log_unit_warning(UNIT(s)->id, "%s still around after SIGKILL. Ignoring.", UNIT(s)->id); |
6c12b52e LP |
445 | scope_enter_dead(s, SCOPE_FAILURE_TIMEOUT); |
446 | break; | |
447 | ||
448 | default: | |
449 | assert_not_reached("Timeout at wrong time."); | |
450 | } | |
718db961 LP |
451 | |
452 | return 0; | |
6c12b52e LP |
453 | } |
454 | ||
a911bb9a LP |
455 | int scope_abandon(Scope *s) { |
456 | assert(s); | |
6c12b52e | 457 | |
a911bb9a LP |
458 | if (!IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED)) |
459 | return -ESTALE; | |
6c12b52e | 460 | |
a911bb9a LP |
461 | free(s->controller); |
462 | s->controller = NULL; | |
6c12b52e | 463 | |
a911bb9a LP |
464 | /* The client is no longer watching the remaining processes, |
465 | * so let's step in here, under the assumption that the | |
466 | * remaining processes will be sooner or later reassigned to | |
467 | * us as parent. */ | |
6c12b52e | 468 | |
a911bb9a LP |
469 | unit_tidy_watch_pids(UNIT(s), 0, 0); |
470 | unit_watch_all_pids(UNIT(s)); | |
6c12b52e | 471 | |
a911bb9a LP |
472 | /* If the PID set is empty now, then let's finish this off */ |
473 | if (set_isempty(UNIT(s)->pids)) | |
474 | scope_notify_cgroup_empty_event(UNIT(s)); | |
475 | else | |
476 | scope_set_state(s, SCOPE_ABANDONED); | |
477 | ||
478 | return 0; | |
6c12b52e LP |
479 | } |
480 | ||
481 | _pure_ static UnitActiveState scope_active_state(Unit *u) { | |
482 | assert(u); | |
483 | ||
484 | return state_translation_table[SCOPE(u)->state]; | |
485 | } | |
486 | ||
487 | _pure_ static const char *scope_sub_state_to_string(Unit *u) { | |
488 | assert(u); | |
489 | ||
490 | return scope_state_to_string(SCOPE(u)->state); | |
491 | } | |
492 | ||
493 | static const char* const scope_state_table[_SCOPE_STATE_MAX] = { | |
494 | [SCOPE_DEAD] = "dead", | |
358712f3 | 495 | [SCOPE_RUNNING] = "running", |
a911bb9a | 496 | [SCOPE_ABANDONED] = "abandoned", |
6c12b52e LP |
497 | [SCOPE_STOP_SIGTERM] = "stop-sigterm", |
498 | [SCOPE_STOP_SIGKILL] = "stop-sigkill", | |
499 | [SCOPE_FAILED] = "failed", | |
500 | }; | |
501 | ||
502 | DEFINE_STRING_TABLE_LOOKUP(scope_state, ScopeState); | |
503 | ||
504 | static const char* const scope_result_table[_SCOPE_RESULT_MAX] = { | |
505 | [SCOPE_SUCCESS] = "success", | |
506 | [SCOPE_FAILURE_RESOURCES] = "resources", | |
507 | [SCOPE_FAILURE_TIMEOUT] = "timeout", | |
508 | }; | |
509 | ||
510 | DEFINE_STRING_TABLE_LOOKUP(scope_result, ScopeResult); | |
511 | ||
512 | const UnitVTable scope_vtable = { | |
513 | .object_size = sizeof(Scope), | |
718db961 LP |
514 | .cgroup_context_offset = offsetof(Scope, cgroup_context), |
515 | .kill_context_offset = offsetof(Scope, kill_context), | |
516 | ||
6c12b52e LP |
517 | .sections = |
518 | "Unit\0" | |
519 | "Scope\0" | |
520 | "Install\0", | |
6c12b52e | 521 | .private_section = "Scope", |
6c12b52e LP |
522 | |
523 | .no_alias = true, | |
524 | .no_instances = true, | |
525 | ||
526 | .init = scope_init, | |
527 | .load = scope_load, | |
528 | .done = scope_done, | |
529 | ||
530 | .coldplug = scope_coldplug, | |
531 | ||
532 | .dump = scope_dump, | |
533 | ||
534 | .start = scope_start, | |
535 | .stop = scope_stop, | |
536 | ||
537 | .kill = scope_kill, | |
538 | ||
68db7a3b ZJS |
539 | .get_timeout = scope_get_timeout, |
540 | ||
6c12b52e LP |
541 | .serialize = scope_serialize, |
542 | .deserialize_item = scope_deserialize_item, | |
543 | ||
544 | .active_state = scope_active_state, | |
545 | .sub_state_to_string = scope_sub_state_to_string, | |
546 | ||
547 | .check_gc = scope_check_gc, | |
548 | ||
a911bb9a LP |
549 | .sigchld_event = scope_sigchld_event, |
550 | ||
8bcca7e2 LP |
551 | .reset_failed = scope_reset_failed, |
552 | ||
6c12b52e LP |
553 | .notify_cgroup_empty = scope_notify_cgroup_empty_event, |
554 | ||
555 | .bus_interface = "org.freedesktop.systemd1.Scope", | |
718db961 | 556 | .bus_vtable = bus_scope_vtable, |
6c12b52e LP |
557 | .bus_set_property = bus_scope_set_property, |
558 | .bus_commit_properties = bus_scope_commit_properties, | |
559 | ||
560 | .can_transient = true | |
561 | }; |