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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 | 32 | #include "log.h" |
9156e799 | 33 | #include "strv.h" |
8e274523 | 34 | |
8e274523 LP |
35 | int cgroup_bonding_realize(CGroupBonding *b) { |
36 | int r; | |
37 | ||
38 | assert(b); | |
39 | assert(b->path); | |
40 | assert(b->controller); | |
41 | ||
ab1f0633 LP |
42 | r = cg_create(b->controller, b->path); |
43 | if (r < 0) { | |
44 | log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r)); | |
8c6db833 | 45 | return r; |
ab1f0633 | 46 | } |
8e274523 | 47 | |
8c6db833 | 48 | b->realized = true; |
8e274523 | 49 | |
8e274523 | 50 | return 0; |
8e274523 LP |
51 | } |
52 | ||
53 | int cgroup_bonding_realize_list(CGroupBonding *first) { | |
54 | CGroupBonding *b; | |
8c6db833 | 55 | int r; |
8e274523 | 56 | |
8c6db833 | 57 | LIST_FOREACH(by_unit, b, first) |
d686d8a9 | 58 | if ((r = cgroup_bonding_realize(b)) < 0 && b->essential) |
8e274523 | 59 | return r; |
8e274523 LP |
60 | |
61 | return 0; | |
62 | } | |
63 | ||
8d53b453 | 64 | void cgroup_bonding_free(CGroupBonding *b, bool trim) { |
8e274523 LP |
65 | assert(b); |
66 | ||
67 | if (b->unit) { | |
68 | CGroupBonding *f; | |
69 | ||
ac155bb8 | 70 | LIST_REMOVE(CGroupBonding, by_unit, b->unit->cgroup_bondings, b); |
8e274523 | 71 | |
d686d8a9 | 72 | if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) { |
ac155bb8 | 73 | assert_se(f = hashmap_get(b->unit->manager->cgroup_bondings, b->path)); |
d686d8a9 | 74 | LIST_REMOVE(CGroupBonding, by_path, f, b); |
8e274523 | 75 | |
d686d8a9 | 76 | if (f) |
ac155bb8 | 77 | hashmap_replace(b->unit->manager->cgroup_bondings, b->path, f); |
d686d8a9 | 78 | else |
ac155bb8 | 79 | hashmap_remove(b->unit->manager->cgroup_bondings, b->path); |
d686d8a9 | 80 | } |
8e274523 LP |
81 | } |
82 | ||
8d53b453 LP |
83 | if (b->realized && b->ours && trim) |
84 | cg_trim(b->controller, b->path, false); | |
8e274523 | 85 | |
c9106f61 LP |
86 | free(b->controller); |
87 | free(b->path); | |
8e274523 LP |
88 | free(b); |
89 | } | |
90 | ||
38c52d46 | 91 | void cgroup_bonding_free_list(CGroupBonding *first, bool remove_or_trim) { |
8e274523 LP |
92 | CGroupBonding *b, *n; |
93 | ||
94 | LIST_FOREACH_SAFE(by_unit, b, n, first) | |
38c52d46 | 95 | cgroup_bonding_free(b, remove_or_trim); |
8e274523 LP |
96 | } |
97 | ||
fb385181 LP |
98 | void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) { |
99 | assert(b); | |
100 | ||
d686d8a9 | 101 | if (b->realized && b->ours) |
fb385181 LP |
102 | cg_trim(b->controller, b->path, delete_root); |
103 | } | |
104 | ||
105 | void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) { | |
106 | CGroupBonding *b; | |
107 | ||
108 | LIST_FOREACH(by_unit, b, first) | |
109 | cgroup_bonding_trim(b, delete_root); | |
110 | } | |
111 | ||
ecedd90f LP |
112 | |
113 | int cgroup_bonding_install(CGroupBonding *b, pid_t pid, const char *cgroup_suffix) { | |
114 | char *p = NULL; | |
115 | const char *path; | |
8e274523 LP |
116 | int r; |
117 | ||
118 | assert(b); | |
119 | assert(pid >= 0); | |
120 | ||
ecedd90f LP |
121 | if (cgroup_suffix) { |
122 | p = join(b->path, "/", cgroup_suffix, NULL); | |
123 | if (!p) | |
124 | return -ENOMEM; | |
125 | ||
126 | path = p; | |
127 | } else | |
128 | path = b->path; | |
129 | ||
130 | r = cg_create_and_attach(b->controller, path, pid); | |
131 | free(p); | |
132 | ||
133 | if (r < 0) | |
8c6db833 | 134 | return r; |
8e274523 | 135 | |
8c6db833 | 136 | b->realized = true; |
8e274523 LP |
137 | return 0; |
138 | } | |
139 | ||
ecedd90f | 140 | int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid, const char *cgroup_suffix) { |
8e274523 | 141 | CGroupBonding *b; |
8c6db833 | 142 | int r; |
8e274523 | 143 | |
ecedd90f LP |
144 | LIST_FOREACH(by_unit, b, first) { |
145 | r = cgroup_bonding_install(b, pid, cgroup_suffix); | |
146 | if (r < 0 && b->essential) | |
8e274523 | 147 | return r; |
ecedd90f | 148 | } |
8e274523 LP |
149 | |
150 | return 0; | |
151 | } | |
152 | ||
64747e2d LP |
153 | int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) { |
154 | assert(b); | |
155 | ||
156 | if (!b->realized) | |
157 | return -EINVAL; | |
158 | ||
159 | return cg_set_group_access(b->controller, b->path, mode, uid, gid); | |
160 | } | |
161 | ||
162 | int cgroup_bonding_set_group_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) { | |
163 | CGroupBonding *b; | |
164 | int r; | |
165 | ||
166 | LIST_FOREACH(by_unit, b, first) { | |
167 | r = cgroup_bonding_set_group_access(b, mode, uid, gid); | |
168 | if (r < 0) | |
169 | return r; | |
170 | } | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
8d53b453 | 175 | int cgroup_bonding_set_task_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid, int sticky) { |
64747e2d LP |
176 | assert(b); |
177 | ||
178 | if (!b->realized) | |
179 | return -EINVAL; | |
180 | ||
8d53b453 | 181 | return cg_set_task_access(b->controller, b->path, mode, uid, gid, sticky); |
64747e2d LP |
182 | } |
183 | ||
8d53b453 | 184 | int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid, int sticky) { |
64747e2d LP |
185 | CGroupBonding *b; |
186 | int r; | |
187 | ||
188 | LIST_FOREACH(by_unit, b, first) { | |
8d53b453 | 189 | r = cgroup_bonding_set_task_access(b, mode, uid, gid, sticky); |
64747e2d LP |
190 | if (r < 0) |
191 | return r; | |
192 | } | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
88f3e0c9 | 197 | int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) { |
ecedd90f LP |
198 | char *p = NULL; |
199 | const char *path; | |
200 | int r; | |
201 | ||
8e274523 | 202 | assert(b); |
8c6db833 | 203 | assert(sig >= 0); |
8e274523 | 204 | |
d686d8a9 | 205 | /* Don't kill cgroups that aren't ours */ |
31e54cc8 | 206 | if (!b->ours) |
d686d8a9 | 207 | return 0; |
8c6db833 | 208 | |
ecedd90f LP |
209 | if (cgroup_suffix) { |
210 | p = join(b->path, "/", cgroup_suffix, NULL); | |
211 | if (!p) | |
212 | return -ENOMEM; | |
213 | ||
214 | path = p; | |
215 | } else | |
216 | path = b->path; | |
217 | ||
88f3e0c9 | 218 | r = cg_kill_recursive(b->controller, path, sig, sigcont, true, rem, s); |
ecedd90f LP |
219 | free(p); |
220 | ||
221 | return r; | |
8e274523 LP |
222 | } |
223 | ||
88f3e0c9 | 224 | int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) { |
8e274523 | 225 | CGroupBonding *b; |
ca949c9d LP |
226 | Set *allocated_set = NULL; |
227 | int ret = -EAGAIN, r; | |
228 | ||
8f53a7b8 LP |
229 | if (!first) |
230 | return 0; | |
231 | ||
ca949c9d LP |
232 | if (!s) |
233 | if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) | |
234 | return -ENOMEM; | |
8e274523 LP |
235 | |
236 | LIST_FOREACH(by_unit, b, first) { | |
88f3e0c9 | 237 | r = cgroup_bonding_kill(b, sig, sigcont, rem, s, cgroup_suffix); |
ecedd90f | 238 | if (r < 0) { |
8c6db833 | 239 | if (r == -EAGAIN || r == -ESRCH) |
50159e6a | 240 | continue; |
8e274523 | 241 | |
ca949c9d LP |
242 | ret = r; |
243 | goto finish; | |
50159e6a LP |
244 | } |
245 | ||
ca949c9d LP |
246 | if (ret < 0 || r > 0) |
247 | ret = r; | |
8e274523 LP |
248 | } |
249 | ||
ca949c9d LP |
250 | finish: |
251 | if (allocated_set) | |
252 | set_free(allocated_set); | |
253 | ||
254 | return ret; | |
8e274523 LP |
255 | } |
256 | ||
257 | /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we | |
258 | * cannot know */ | |
259 | int cgroup_bonding_is_empty(CGroupBonding *b) { | |
8e274523 LP |
260 | int r; |
261 | ||
262 | assert(b); | |
263 | ||
8c6db833 LP |
264 | if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0) |
265 | return r; | |
8e274523 | 266 | |
8c6db833 LP |
267 | /* If it is empty it is empty */ |
268 | if (r > 0) | |
8e274523 LP |
269 | return 1; |
270 | ||
8c6db833 | 271 | /* It's not only us using this cgroup, so we just don't know */ |
d686d8a9 | 272 | return b->ours ? 0 : -EAGAIN; |
8e274523 LP |
273 | } |
274 | ||
275 | int cgroup_bonding_is_empty_list(CGroupBonding *first) { | |
276 | CGroupBonding *b; | |
277 | ||
278 | LIST_FOREACH(by_unit, b, first) { | |
279 | int r; | |
280 | ||
281 | if ((r = cgroup_bonding_is_empty(b)) < 0) { | |
282 | /* If this returned -EAGAIN, then we don't know if the | |
283 | * group is empty, so let's see if another group can | |
284 | * tell us */ | |
285 | ||
286 | if (r != -EAGAIN) | |
287 | return r; | |
288 | } else | |
289 | return r; | |
290 | } | |
291 | ||
292 | return -EAGAIN; | |
293 | } | |
294 | ||
8e274523 | 295 | int manager_setup_cgroup(Manager *m) { |
c6c18be3 | 296 | char *current = NULL, *path = NULL; |
8e274523 | 297 | int r; |
7ccfb64a | 298 | char suffix[32]; |
8e274523 LP |
299 | |
300 | assert(m); | |
301 | ||
e5a53dc7 | 302 | /* 0. Be nice to Ingo Molnar #628004 */ |
0c85a4f3 | 303 | if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) { |
e5a53dc7 LP |
304 | log_warning("No control group support available, not creating root group."); |
305 | return 0; | |
306 | } | |
307 | ||
35d2e7ec | 308 | /* 1. Determine hierarchy */ |
9156e799 LP |
309 | r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t); |
310 | if (r < 0) { | |
12235040 | 311 | log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); |
c6c18be3 | 312 | goto finish; |
12235040 | 313 | } |
8e274523 | 314 | |
0baf24dd LP |
315 | if (m->running_as == MANAGER_SYSTEM) |
316 | strcpy(suffix, "/system"); | |
317 | else { | |
318 | snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid()); | |
319 | char_array_0(suffix); | |
320 | } | |
7ccfb64a | 321 | |
8e274523 | 322 | free(m->cgroup_hierarchy); |
c6c18be3 | 323 | if (endswith(current, suffix)) { |
7ccfb64a | 324 | /* We probably got reexecuted and can continue to use our root cgroup */ |
c6c18be3 LP |
325 | m->cgroup_hierarchy = current; |
326 | current = NULL; | |
7ccfb64a | 327 | |
c6c18be3 LP |
328 | } else { |
329 | /* We need a new root cgroup */ | |
7ccfb64a | 330 | m->cgroup_hierarchy = NULL; |
e364ad06 | 331 | if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) { |
12235040 | 332 | log_error("Out of memory"); |
c6c18be3 LP |
333 | r = -ENOMEM; |
334 | goto finish; | |
335 | } | |
8e274523 LP |
336 | } |
337 | ||
35d2e7ec | 338 | /* 2. Show data */ |
3474ae3c LP |
339 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path); |
340 | if (r < 0) { | |
12235040 | 341 | log_error("Cannot find cgroup mount point: %s", strerror(-r)); |
c6c18be3 | 342 | goto finish; |
12235040 | 343 | } |
8e274523 | 344 | |
c6c18be3 LP |
345 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
346 | ||
35d2e7ec | 347 | /* 3. Install agent */ |
3474ae3c LP |
348 | r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); |
349 | if (r < 0) | |
8e274523 | 350 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); |
c6c18be3 LP |
351 | else if (r > 0) |
352 | log_debug("Installed release agent."); | |
8e274523 | 353 | else |
c6c18be3 | 354 | log_debug("Release agent already installed."); |
8e274523 | 355 | |
35d2e7ec | 356 | /* 4. Realize the group */ |
9156e799 LP |
357 | r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0); |
358 | if (r < 0) { | |
8e274523 | 359 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
c6c18be3 LP |
360 | goto finish; |
361 | } | |
362 | ||
35d2e7ec | 363 | /* 5. And pin it, so that it cannot be unmounted */ |
c6c18be3 LP |
364 | if (m->pin_cgroupfs_fd >= 0) |
365 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
366 | ||
9156e799 LP |
367 | m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); |
368 | if (r < 0) { | |
12235040 | 369 | log_error("Failed to open pin file: %m"); |
c6c18be3 LP |
370 | r = -errno; |
371 | goto finish; | |
372 | } | |
373 | ||
374 | log_debug("Created root group."); | |
375 | ||
b59e2465 | 376 | cg_shorten_controllers(m->default_controllers); |
9156e799 | 377 | |
c6c18be3 LP |
378 | finish: |
379 | free(current); | |
380 | free(path); | |
8e274523 LP |
381 | |
382 | return r; | |
383 | } | |
384 | ||
c6c18be3 | 385 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
386 | assert(m); |
387 | ||
c6c18be3 LP |
388 | if (delete && m->cgroup_hierarchy) |
389 | cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy); | |
8e274523 | 390 | |
c6c18be3 LP |
391 | if (m->pin_cgroupfs_fd >= 0) { |
392 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
393 | m->pin_cgroupfs_fd = -1; | |
394 | } | |
395 | ||
396 | free(m->cgroup_hierarchy); | |
397 | m->cgroup_hierarchy = NULL; | |
8e274523 LP |
398 | } |
399 | ||
acb14d31 LP |
400 | int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) { |
401 | CGroupBonding *b; | |
402 | char *p; | |
403 | ||
404 | assert(m); | |
405 | assert(cgroup); | |
406 | assert(bonding); | |
407 | ||
408 | b = hashmap_get(m->cgroup_bondings, cgroup); | |
5c72face | 409 | if (b) { |
acb14d31 LP |
410 | *bonding = b; |
411 | return 1; | |
412 | } | |
413 | ||
414 | p = strdup(cgroup); | |
415 | if (!p) | |
416 | return -ENOMEM; | |
417 | ||
418 | for (;;) { | |
419 | char *e; | |
420 | ||
421 | e = strrchr(p, '/'); | |
422 | if (!e || e == p) { | |
423 | free(p); | |
424 | *bonding = NULL; | |
425 | return 0; | |
426 | } | |
427 | ||
428 | *e = 0; | |
429 | ||
430 | b = hashmap_get(m->cgroup_bondings, p); | |
431 | if (b) { | |
432 | free(p); | |
433 | *bonding = b; | |
434 | return 1; | |
435 | } | |
436 | } | |
437 | } | |
438 | ||
8e274523 LP |
439 | int cgroup_notify_empty(Manager *m, const char *group) { |
440 | CGroupBonding *l, *b; | |
acb14d31 | 441 | int r; |
8e274523 LP |
442 | |
443 | assert(m); | |
444 | assert(group); | |
445 | ||
acb14d31 LP |
446 | r = cgroup_bonding_get(m, group, &l); |
447 | if (r <= 0) | |
448 | return r; | |
8e274523 LP |
449 | |
450 | LIST_FOREACH(by_path, b, l) { | |
451 | int t; | |
452 | ||
453 | if (!b->unit) | |
454 | continue; | |
455 | ||
353fa6a2 LP |
456 | t = cgroup_bonding_is_empty_list(b); |
457 | if (t < 0) { | |
8e274523 LP |
458 | |
459 | /* If we don't know, we don't know */ | |
460 | if (t != -EAGAIN) | |
461 | log_warning("Failed to check whether cgroup is empty: %s", strerror(errno)); | |
462 | ||
463 | continue; | |
464 | } | |
465 | ||
353fa6a2 LP |
466 | if (t > 0) { |
467 | /* If it is empty, let's delete it */ | |
ac155bb8 | 468 | cgroup_bonding_trim_list(b->unit->cgroup_bondings, true); |
353fa6a2 | 469 | |
8e274523 LP |
470 | if (UNIT_VTABLE(b->unit)->cgroup_notify_empty) |
471 | UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit); | |
353fa6a2 | 472 | } |
8e274523 LP |
473 | } |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
8c47c732 LP |
478 | Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) { |
479 | CGroupBonding *l, *b; | |
480 | char *group = NULL; | |
8c47c732 LP |
481 | |
482 | assert(m); | |
483 | ||
484 | if (pid <= 1) | |
485 | return NULL; | |
486 | ||
e364ad06 | 487 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0) |
8c47c732 LP |
488 | return NULL; |
489 | ||
490 | l = hashmap_get(m->cgroup_bondings, group); | |
4455bcd0 LP |
491 | |
492 | if (!l) { | |
493 | char *slash; | |
494 | ||
495 | while ((slash = strrchr(group, '/'))) { | |
496 | if (slash == group) | |
497 | break; | |
498 | ||
499 | *slash = 0; | |
500 | ||
501 | if ((l = hashmap_get(m->cgroup_bondings, group))) | |
502 | break; | |
503 | } | |
504 | } | |
505 | ||
8c47c732 LP |
506 | free(group); |
507 | ||
8c47c732 LP |
508 | LIST_FOREACH(by_path, b, l) { |
509 | ||
510 | if (!b->unit) | |
511 | continue; | |
512 | ||
d686d8a9 | 513 | if (b->ours) |
8c47c732 LP |
514 | return b->unit; |
515 | } | |
516 | ||
517 | return NULL; | |
518 | } | |
519 | ||
8e274523 LP |
520 | CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) { |
521 | CGroupBonding *b; | |
522 | ||
523 | assert(controller); | |
524 | ||
525 | LIST_FOREACH(by_unit, b, first) | |
526 | if (streq(b->controller, controller)) | |
527 | return b; | |
528 | ||
529 | return NULL; | |
530 | } | |
6dde1f33 LP |
531 | |
532 | char *cgroup_bonding_to_string(CGroupBonding *b) { | |
533 | char *r; | |
534 | ||
535 | assert(b); | |
536 | ||
537 | if (asprintf(&r, "%s:%s", b->controller, b->path) < 0) | |
538 | return NULL; | |
539 | ||
540 | return r; | |
541 | } | |
4fbf50b3 LP |
542 | |
543 | pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) { | |
544 | FILE *f; | |
2633eb83 | 545 | pid_t pid = 0, npid, mypid; |
4fbf50b3 LP |
546 | |
547 | assert(b); | |
548 | ||
d686d8a9 | 549 | if (!b->ours) |
4fbf50b3 LP |
550 | return 0; |
551 | ||
bd40a2d8 | 552 | if (cg_enumerate_processes(b->controller, b->path, &f) < 0) |
4fbf50b3 LP |
553 | return 0; |
554 | ||
2633eb83 LP |
555 | mypid = getpid(); |
556 | ||
bd40a2d8 | 557 | while (cg_read_pid(f, &npid) > 0) { |
2633eb83 | 558 | pid_t ppid; |
4fbf50b3 LP |
559 | |
560 | if (npid == pid) | |
561 | continue; | |
562 | ||
2633eb83 LP |
563 | /* Ignore processes that aren't our kids */ |
564 | if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid) | |
565 | continue; | |
566 | ||
4fbf50b3 | 567 | if (pid != 0) { |
2633eb83 LP |
568 | /* Dang, there's more than one daemonized PID |
569 | in this group, so we don't know what process | |
570 | is the main process. */ | |
4fbf50b3 LP |
571 | pid = 0; |
572 | break; | |
573 | } | |
574 | ||
575 | pid = npid; | |
576 | } | |
577 | ||
578 | fclose(f); | |
579 | ||
580 | return pid; | |
581 | } | |
582 | ||
583 | pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) { | |
584 | CGroupBonding *b; | |
585 | pid_t pid; | |
586 | ||
587 | /* Try to find a main pid from this cgroup, but checking if | |
588 | * there's only one PID in the cgroup and returning it. Later | |
589 | * on we might want to add additional, smarter heuristics | |
590 | * here. */ | |
591 | ||
592 | LIST_FOREACH(by_unit, b, first) | |
593 | if ((pid = cgroup_bonding_search_main_pid(b)) != 0) | |
594 | return pid; | |
595 | ||
596 | return 0; | |
597 | ||
598 | } |