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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8e274523 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
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 | |
8e274523 LP |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8e274523 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8e274523 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <assert.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/types.h> | |
26 | #include <signal.h> | |
27 | #include <sys/mount.h> | |
c6c18be3 | 28 | #include <fcntl.h> |
8c6db833 | 29 | |
8e274523 | 30 | #include "cgroup.h" |
8c6db833 | 31 | #include "cgroup-util.h" |
8e274523 LP |
32 | #include "log.h" |
33 | ||
8e274523 LP |
34 | int cgroup_bonding_realize(CGroupBonding *b) { |
35 | int r; | |
36 | ||
37 | assert(b); | |
38 | assert(b->path); | |
39 | assert(b->controller); | |
40 | ||
ab1f0633 LP |
41 | r = cg_create(b->controller, b->path); |
42 | if (r < 0) { | |
43 | log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r)); | |
8c6db833 | 44 | return r; |
ab1f0633 | 45 | } |
8e274523 | 46 | |
8c6db833 | 47 | b->realized = true; |
8e274523 | 48 | |
8e274523 | 49 | return 0; |
8e274523 LP |
50 | } |
51 | ||
52 | int cgroup_bonding_realize_list(CGroupBonding *first) { | |
53 | CGroupBonding *b; | |
8c6db833 | 54 | int r; |
8e274523 | 55 | |
8c6db833 | 56 | LIST_FOREACH(by_unit, b, first) |
d686d8a9 | 57 | if ((r = cgroup_bonding_realize(b)) < 0 && b->essential) |
8e274523 | 58 | return r; |
8e274523 LP |
59 | |
60 | return 0; | |
61 | } | |
62 | ||
8d53b453 | 63 | void cgroup_bonding_free(CGroupBonding *b, bool trim) { |
8e274523 LP |
64 | assert(b); |
65 | ||
66 | if (b->unit) { | |
67 | CGroupBonding *f; | |
68 | ||
ac155bb8 | 69 | LIST_REMOVE(CGroupBonding, by_unit, b->unit->cgroup_bondings, b); |
8e274523 | 70 | |
d686d8a9 | 71 | if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) { |
ac155bb8 | 72 | assert_se(f = hashmap_get(b->unit->manager->cgroup_bondings, b->path)); |
d686d8a9 | 73 | LIST_REMOVE(CGroupBonding, by_path, f, b); |
8e274523 | 74 | |
d686d8a9 | 75 | if (f) |
ac155bb8 | 76 | hashmap_replace(b->unit->manager->cgroup_bondings, b->path, f); |
d686d8a9 | 77 | else |
ac155bb8 | 78 | hashmap_remove(b->unit->manager->cgroup_bondings, b->path); |
d686d8a9 | 79 | } |
8e274523 LP |
80 | } |
81 | ||
8d53b453 LP |
82 | if (b->realized && b->ours && trim) |
83 | cg_trim(b->controller, b->path, false); | |
8e274523 | 84 | |
c9106f61 LP |
85 | free(b->controller); |
86 | free(b->path); | |
8e274523 LP |
87 | free(b); |
88 | } | |
89 | ||
38c52d46 | 90 | void cgroup_bonding_free_list(CGroupBonding *first, bool remove_or_trim) { |
8e274523 LP |
91 | CGroupBonding *b, *n; |
92 | ||
93 | LIST_FOREACH_SAFE(by_unit, b, n, first) | |
38c52d46 | 94 | cgroup_bonding_free(b, remove_or_trim); |
8e274523 LP |
95 | } |
96 | ||
fb385181 LP |
97 | void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) { |
98 | assert(b); | |
99 | ||
d686d8a9 | 100 | if (b->realized && b->ours) |
fb385181 LP |
101 | cg_trim(b->controller, b->path, delete_root); |
102 | } | |
103 | ||
104 | void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) { | |
105 | CGroupBonding *b; | |
106 | ||
107 | LIST_FOREACH(by_unit, b, first) | |
108 | cgroup_bonding_trim(b, delete_root); | |
109 | } | |
110 | ||
ecedd90f LP |
111 | |
112 | int cgroup_bonding_install(CGroupBonding *b, pid_t pid, const char *cgroup_suffix) { | |
113 | char *p = NULL; | |
114 | const char *path; | |
8e274523 LP |
115 | int r; |
116 | ||
117 | assert(b); | |
118 | assert(pid >= 0); | |
119 | ||
ecedd90f LP |
120 | if (cgroup_suffix) { |
121 | p = join(b->path, "/", cgroup_suffix, NULL); | |
122 | if (!p) | |
123 | return -ENOMEM; | |
124 | ||
125 | path = p; | |
126 | } else | |
127 | path = b->path; | |
128 | ||
129 | r = cg_create_and_attach(b->controller, path, pid); | |
130 | free(p); | |
131 | ||
132 | if (r < 0) | |
8c6db833 | 133 | return r; |
8e274523 | 134 | |
8c6db833 | 135 | b->realized = true; |
8e274523 LP |
136 | return 0; |
137 | } | |
138 | ||
ecedd90f | 139 | int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid, const char *cgroup_suffix) { |
8e274523 | 140 | CGroupBonding *b; |
8c6db833 | 141 | int r; |
8e274523 | 142 | |
ecedd90f LP |
143 | LIST_FOREACH(by_unit, b, first) { |
144 | r = cgroup_bonding_install(b, pid, cgroup_suffix); | |
145 | if (r < 0 && b->essential) | |
8e274523 | 146 | return r; |
ecedd90f | 147 | } |
8e274523 LP |
148 | |
149 | return 0; | |
150 | } | |
151 | ||
64747e2d LP |
152 | int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) { |
153 | assert(b); | |
154 | ||
155 | if (!b->realized) | |
156 | return -EINVAL; | |
157 | ||
158 | return cg_set_group_access(b->controller, b->path, mode, uid, gid); | |
159 | } | |
160 | ||
161 | int cgroup_bonding_set_group_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) { | |
162 | CGroupBonding *b; | |
163 | int r; | |
164 | ||
165 | LIST_FOREACH(by_unit, b, first) { | |
166 | r = cgroup_bonding_set_group_access(b, mode, uid, gid); | |
167 | if (r < 0) | |
168 | return r; | |
169 | } | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
8d53b453 | 174 | int cgroup_bonding_set_task_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid, int sticky) { |
64747e2d LP |
175 | assert(b); |
176 | ||
177 | if (!b->realized) | |
178 | return -EINVAL; | |
179 | ||
8d53b453 | 180 | return cg_set_task_access(b->controller, b->path, mode, uid, gid, sticky); |
64747e2d LP |
181 | } |
182 | ||
8d53b453 | 183 | int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid, int sticky) { |
64747e2d LP |
184 | CGroupBonding *b; |
185 | int r; | |
186 | ||
187 | LIST_FOREACH(by_unit, b, first) { | |
8d53b453 | 188 | r = cgroup_bonding_set_task_access(b, mode, uid, gid, sticky); |
64747e2d LP |
189 | if (r < 0) |
190 | return r; | |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
ecedd90f LP |
196 | int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, Set *s, const char *cgroup_suffix) { |
197 | char *p = NULL; | |
198 | const char *path; | |
199 | int r; | |
200 | ||
8e274523 | 201 | assert(b); |
8c6db833 | 202 | assert(sig >= 0); |
8e274523 | 203 | |
d686d8a9 | 204 | /* Don't kill cgroups that aren't ours */ |
31e54cc8 | 205 | if (!b->ours) |
d686d8a9 | 206 | return 0; |
8c6db833 | 207 | |
ecedd90f LP |
208 | if (cgroup_suffix) { |
209 | p = join(b->path, "/", cgroup_suffix, NULL); | |
210 | if (!p) | |
211 | return -ENOMEM; | |
212 | ||
213 | path = p; | |
214 | } else | |
215 | path = b->path; | |
216 | ||
217 | r = cg_kill_recursive(b->controller, path, sig, sigcont, true, false, s); | |
218 | free(p); | |
219 | ||
220 | return r; | |
8e274523 LP |
221 | } |
222 | ||
ecedd90f | 223 | int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, Set *s, const char *cgroup_suffix) { |
8e274523 | 224 | CGroupBonding *b; |
ca949c9d LP |
225 | Set *allocated_set = NULL; |
226 | int ret = -EAGAIN, r; | |
227 | ||
8f53a7b8 LP |
228 | if (!first) |
229 | return 0; | |
230 | ||
ca949c9d LP |
231 | if (!s) |
232 | if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) | |
233 | return -ENOMEM; | |
8e274523 LP |
234 | |
235 | LIST_FOREACH(by_unit, b, first) { | |
ecedd90f LP |
236 | r = cgroup_bonding_kill(b, sig, sigcont, s, cgroup_suffix); |
237 | if (r < 0) { | |
8c6db833 | 238 | if (r == -EAGAIN || r == -ESRCH) |
50159e6a | 239 | continue; |
8e274523 | 240 | |
ca949c9d LP |
241 | ret = r; |
242 | goto finish; | |
50159e6a LP |
243 | } |
244 | ||
ca949c9d LP |
245 | if (ret < 0 || r > 0) |
246 | ret = r; | |
8e274523 LP |
247 | } |
248 | ||
ca949c9d LP |
249 | finish: |
250 | if (allocated_set) | |
251 | set_free(allocated_set); | |
252 | ||
253 | return ret; | |
8e274523 LP |
254 | } |
255 | ||
256 | /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we | |
257 | * cannot know */ | |
258 | int cgroup_bonding_is_empty(CGroupBonding *b) { | |
8e274523 LP |
259 | int r; |
260 | ||
261 | assert(b); | |
262 | ||
8c6db833 LP |
263 | if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0) |
264 | return r; | |
8e274523 | 265 | |
8c6db833 LP |
266 | /* If it is empty it is empty */ |
267 | if (r > 0) | |
8e274523 LP |
268 | return 1; |
269 | ||
8c6db833 | 270 | /* It's not only us using this cgroup, so we just don't know */ |
d686d8a9 | 271 | return b->ours ? 0 : -EAGAIN; |
8e274523 LP |
272 | } |
273 | ||
274 | int cgroup_bonding_is_empty_list(CGroupBonding *first) { | |
275 | CGroupBonding *b; | |
276 | ||
277 | LIST_FOREACH(by_unit, b, first) { | |
278 | int r; | |
279 | ||
280 | if ((r = cgroup_bonding_is_empty(b)) < 0) { | |
281 | /* If this returned -EAGAIN, then we don't know if the | |
282 | * group is empty, so let's see if another group can | |
283 | * tell us */ | |
284 | ||
285 | if (r != -EAGAIN) | |
286 | return r; | |
287 | } else | |
288 | return r; | |
289 | } | |
290 | ||
291 | return -EAGAIN; | |
292 | } | |
293 | ||
8e274523 | 294 | int manager_setup_cgroup(Manager *m) { |
c6c18be3 | 295 | char *current = NULL, *path = NULL; |
8e274523 | 296 | int r; |
7ccfb64a | 297 | char suffix[32]; |
8e274523 LP |
298 | |
299 | assert(m); | |
300 | ||
e5a53dc7 | 301 | /* 0. Be nice to Ingo Molnar #628004 */ |
0c85a4f3 | 302 | if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) { |
e5a53dc7 LP |
303 | log_warning("No control group support available, not creating root group."); |
304 | return 0; | |
305 | } | |
306 | ||
35d2e7ec | 307 | /* 1. Determine hierarchy */ |
12235040 LP |
308 | if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t)) < 0) { |
309 | log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); | |
c6c18be3 | 310 | goto finish; |
12235040 | 311 | } |
8e274523 | 312 | |
0baf24dd LP |
313 | if (m->running_as == MANAGER_SYSTEM) |
314 | strcpy(suffix, "/system"); | |
315 | else { | |
316 | snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid()); | |
317 | char_array_0(suffix); | |
318 | } | |
7ccfb64a | 319 | |
8e274523 | 320 | free(m->cgroup_hierarchy); |
c6c18be3 | 321 | if (endswith(current, suffix)) { |
7ccfb64a | 322 | /* We probably got reexecuted and can continue to use our root cgroup */ |
c6c18be3 LP |
323 | m->cgroup_hierarchy = current; |
324 | current = NULL; | |
7ccfb64a | 325 | |
c6c18be3 LP |
326 | } else { |
327 | /* We need a new root cgroup */ | |
7ccfb64a | 328 | m->cgroup_hierarchy = NULL; |
e364ad06 | 329 | if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) { |
12235040 | 330 | log_error("Out of memory"); |
c6c18be3 LP |
331 | r = -ENOMEM; |
332 | goto finish; | |
333 | } | |
8e274523 LP |
334 | } |
335 | ||
35d2e7ec | 336 | /* 2. Show data */ |
3474ae3c LP |
337 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path); |
338 | if (r < 0) { | |
12235040 | 339 | log_error("Cannot find cgroup mount point: %s", strerror(-r)); |
c6c18be3 | 340 | goto finish; |
12235040 | 341 | } |
8e274523 | 342 | |
c6c18be3 LP |
343 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
344 | ||
35d2e7ec | 345 | /* 3. Install agent */ |
3474ae3c LP |
346 | r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); |
347 | if (r < 0) | |
8e274523 | 348 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); |
c6c18be3 LP |
349 | else if (r > 0) |
350 | log_debug("Installed release agent."); | |
8e274523 | 351 | else |
c6c18be3 | 352 | log_debug("Release agent already installed."); |
8e274523 | 353 | |
35d2e7ec | 354 | /* 4. Realize the group */ |
c6c18be3 | 355 | if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) { |
8e274523 | 356 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
c6c18be3 LP |
357 | goto finish; |
358 | } | |
359 | ||
35d2e7ec | 360 | /* 5. And pin it, so that it cannot be unmounted */ |
c6c18be3 LP |
361 | if (m->pin_cgroupfs_fd >= 0) |
362 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
363 | ||
364 | if ((m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK)) < 0) { | |
12235040 | 365 | log_error("Failed to open pin file: %m"); |
c6c18be3 LP |
366 | r = -errno; |
367 | goto finish; | |
368 | } | |
369 | ||
370 | log_debug("Created root group."); | |
371 | ||
372 | finish: | |
373 | free(current); | |
374 | free(path); | |
8e274523 LP |
375 | |
376 | return r; | |
377 | } | |
378 | ||
c6c18be3 | 379 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
380 | assert(m); |
381 | ||
c6c18be3 LP |
382 | if (delete && m->cgroup_hierarchy) |
383 | cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy); | |
8e274523 | 384 | |
c6c18be3 LP |
385 | if (m->pin_cgroupfs_fd >= 0) { |
386 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
387 | m->pin_cgroupfs_fd = -1; | |
388 | } | |
389 | ||
390 | free(m->cgroup_hierarchy); | |
391 | m->cgroup_hierarchy = NULL; | |
8e274523 LP |
392 | } |
393 | ||
acb14d31 LP |
394 | int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) { |
395 | CGroupBonding *b; | |
396 | char *p; | |
397 | ||
398 | assert(m); | |
399 | assert(cgroup); | |
400 | assert(bonding); | |
401 | ||
402 | b = hashmap_get(m->cgroup_bondings, cgroup); | |
5c72face | 403 | if (b) { |
acb14d31 LP |
404 | *bonding = b; |
405 | return 1; | |
406 | } | |
407 | ||
408 | p = strdup(cgroup); | |
409 | if (!p) | |
410 | return -ENOMEM; | |
411 | ||
412 | for (;;) { | |
413 | char *e; | |
414 | ||
415 | e = strrchr(p, '/'); | |
416 | if (!e || e == p) { | |
417 | free(p); | |
418 | *bonding = NULL; | |
419 | return 0; | |
420 | } | |
421 | ||
422 | *e = 0; | |
423 | ||
424 | b = hashmap_get(m->cgroup_bondings, p); | |
425 | if (b) { | |
426 | free(p); | |
427 | *bonding = b; | |
428 | return 1; | |
429 | } | |
430 | } | |
431 | } | |
432 | ||
8e274523 LP |
433 | int cgroup_notify_empty(Manager *m, const char *group) { |
434 | CGroupBonding *l, *b; | |
acb14d31 | 435 | int r; |
8e274523 LP |
436 | |
437 | assert(m); | |
438 | assert(group); | |
439 | ||
acb14d31 LP |
440 | r = cgroup_bonding_get(m, group, &l); |
441 | if (r <= 0) | |
442 | return r; | |
8e274523 LP |
443 | |
444 | LIST_FOREACH(by_path, b, l) { | |
445 | int t; | |
446 | ||
447 | if (!b->unit) | |
448 | continue; | |
449 | ||
353fa6a2 LP |
450 | t = cgroup_bonding_is_empty_list(b); |
451 | if (t < 0) { | |
8e274523 LP |
452 | |
453 | /* If we don't know, we don't know */ | |
454 | if (t != -EAGAIN) | |
455 | log_warning("Failed to check whether cgroup is empty: %s", strerror(errno)); | |
456 | ||
457 | continue; | |
458 | } | |
459 | ||
353fa6a2 LP |
460 | if (t > 0) { |
461 | /* If it is empty, let's delete it */ | |
ac155bb8 | 462 | cgroup_bonding_trim_list(b->unit->cgroup_bondings, true); |
353fa6a2 | 463 | |
8e274523 LP |
464 | if (UNIT_VTABLE(b->unit)->cgroup_notify_empty) |
465 | UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit); | |
353fa6a2 | 466 | } |
8e274523 LP |
467 | } |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
8c47c732 LP |
472 | Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) { |
473 | CGroupBonding *l, *b; | |
474 | char *group = NULL; | |
8c47c732 LP |
475 | |
476 | assert(m); | |
477 | ||
478 | if (pid <= 1) | |
479 | return NULL; | |
480 | ||
e364ad06 | 481 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0) |
8c47c732 LP |
482 | return NULL; |
483 | ||
484 | l = hashmap_get(m->cgroup_bondings, group); | |
4455bcd0 LP |
485 | |
486 | if (!l) { | |
487 | char *slash; | |
488 | ||
489 | while ((slash = strrchr(group, '/'))) { | |
490 | if (slash == group) | |
491 | break; | |
492 | ||
493 | *slash = 0; | |
494 | ||
495 | if ((l = hashmap_get(m->cgroup_bondings, group))) | |
496 | break; | |
497 | } | |
498 | } | |
499 | ||
8c47c732 LP |
500 | free(group); |
501 | ||
8c47c732 LP |
502 | LIST_FOREACH(by_path, b, l) { |
503 | ||
504 | if (!b->unit) | |
505 | continue; | |
506 | ||
d686d8a9 | 507 | if (b->ours) |
8c47c732 LP |
508 | return b->unit; |
509 | } | |
510 | ||
511 | return NULL; | |
512 | } | |
513 | ||
8e274523 LP |
514 | CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) { |
515 | CGroupBonding *b; | |
516 | ||
517 | assert(controller); | |
518 | ||
519 | LIST_FOREACH(by_unit, b, first) | |
520 | if (streq(b->controller, controller)) | |
521 | return b; | |
522 | ||
523 | return NULL; | |
524 | } | |
6dde1f33 LP |
525 | |
526 | char *cgroup_bonding_to_string(CGroupBonding *b) { | |
527 | char *r; | |
528 | ||
529 | assert(b); | |
530 | ||
531 | if (asprintf(&r, "%s:%s", b->controller, b->path) < 0) | |
532 | return NULL; | |
533 | ||
534 | return r; | |
535 | } | |
4fbf50b3 LP |
536 | |
537 | pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) { | |
538 | FILE *f; | |
2633eb83 | 539 | pid_t pid = 0, npid, mypid; |
4fbf50b3 LP |
540 | |
541 | assert(b); | |
542 | ||
d686d8a9 | 543 | if (!b->ours) |
4fbf50b3 LP |
544 | return 0; |
545 | ||
bd40a2d8 | 546 | if (cg_enumerate_processes(b->controller, b->path, &f) < 0) |
4fbf50b3 LP |
547 | return 0; |
548 | ||
2633eb83 LP |
549 | mypid = getpid(); |
550 | ||
bd40a2d8 | 551 | while (cg_read_pid(f, &npid) > 0) { |
2633eb83 | 552 | pid_t ppid; |
4fbf50b3 LP |
553 | |
554 | if (npid == pid) | |
555 | continue; | |
556 | ||
2633eb83 LP |
557 | /* Ignore processes that aren't our kids */ |
558 | if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid) | |
559 | continue; | |
560 | ||
4fbf50b3 | 561 | if (pid != 0) { |
2633eb83 LP |
562 | /* Dang, there's more than one daemonized PID |
563 | in this group, so we don't know what process | |
564 | is the main process. */ | |
4fbf50b3 LP |
565 | pid = 0; |
566 | break; | |
567 | } | |
568 | ||
569 | pid = npid; | |
570 | } | |
571 | ||
572 | fclose(f); | |
573 | ||
574 | return pid; | |
575 | } | |
576 | ||
577 | pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) { | |
578 | CGroupBonding *b; | |
579 | pid_t pid; | |
580 | ||
581 | /* Try to find a main pid from this cgroup, but checking if | |
582 | * there's only one PID in the cgroup and returning it. Later | |
583 | * on we might want to add additional, smarter heuristics | |
584 | * here. */ | |
585 | ||
586 | LIST_FOREACH(by_unit, b, first) | |
587 | if ((pid = cgroup_bonding_search_main_pid(b)) != 0) | |
588 | return pid; | |
589 | ||
590 | return 0; | |
591 | ||
592 | } |