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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" |
9eb977db | 34 | #include "path-util.h" |
8e274523 | 35 | |
8e274523 LP |
36 | int cgroup_bonding_realize(CGroupBonding *b) { |
37 | int r; | |
38 | ||
39 | assert(b); | |
40 | assert(b->path); | |
41 | assert(b->controller); | |
42 | ||
ab1f0633 LP |
43 | r = cg_create(b->controller, b->path); |
44 | if (r < 0) { | |
45 | log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r)); | |
8c6db833 | 46 | return r; |
ab1f0633 | 47 | } |
8e274523 | 48 | |
8c6db833 | 49 | b->realized = true; |
8e274523 | 50 | |
8e274523 | 51 | return 0; |
8e274523 LP |
52 | } |
53 | ||
54 | int cgroup_bonding_realize_list(CGroupBonding *first) { | |
55 | CGroupBonding *b; | |
8c6db833 | 56 | int r; |
8e274523 | 57 | |
8c6db833 | 58 | LIST_FOREACH(by_unit, b, first) |
d686d8a9 | 59 | if ((r = cgroup_bonding_realize(b)) < 0 && b->essential) |
8e274523 | 60 | return r; |
8e274523 LP |
61 | |
62 | return 0; | |
63 | } | |
64 | ||
8d53b453 | 65 | void cgroup_bonding_free(CGroupBonding *b, bool trim) { |
8e274523 LP |
66 | assert(b); |
67 | ||
68 | if (b->unit) { | |
69 | CGroupBonding *f; | |
70 | ||
ac155bb8 | 71 | LIST_REMOVE(CGroupBonding, by_unit, b->unit->cgroup_bondings, b); |
8e274523 | 72 | |
d686d8a9 | 73 | if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) { |
ac155bb8 | 74 | assert_se(f = hashmap_get(b->unit->manager->cgroup_bondings, b->path)); |
d686d8a9 | 75 | LIST_REMOVE(CGroupBonding, by_path, f, b); |
8e274523 | 76 | |
d686d8a9 | 77 | if (f) |
ac155bb8 | 78 | hashmap_replace(b->unit->manager->cgroup_bondings, b->path, f); |
d686d8a9 | 79 | else |
ac155bb8 | 80 | hashmap_remove(b->unit->manager->cgroup_bondings, b->path); |
d686d8a9 | 81 | } |
8e274523 LP |
82 | } |
83 | ||
8d53b453 LP |
84 | if (b->realized && b->ours && trim) |
85 | cg_trim(b->controller, b->path, false); | |
8e274523 | 86 | |
c9106f61 LP |
87 | free(b->controller); |
88 | free(b->path); | |
8e274523 LP |
89 | free(b); |
90 | } | |
91 | ||
38c52d46 | 92 | void cgroup_bonding_free_list(CGroupBonding *first, bool remove_or_trim) { |
8e274523 LP |
93 | CGroupBonding *b, *n; |
94 | ||
95 | LIST_FOREACH_SAFE(by_unit, b, n, first) | |
38c52d46 | 96 | cgroup_bonding_free(b, remove_or_trim); |
8e274523 LP |
97 | } |
98 | ||
fb385181 LP |
99 | void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) { |
100 | assert(b); | |
101 | ||
d686d8a9 | 102 | if (b->realized && b->ours) |
fb385181 LP |
103 | cg_trim(b->controller, b->path, delete_root); |
104 | } | |
105 | ||
106 | void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) { | |
107 | CGroupBonding *b; | |
108 | ||
109 | LIST_FOREACH(by_unit, b, first) | |
110 | cgroup_bonding_trim(b, delete_root); | |
111 | } | |
112 | ||
ecedd90f LP |
113 | |
114 | int cgroup_bonding_install(CGroupBonding *b, pid_t pid, const char *cgroup_suffix) { | |
115 | char *p = NULL; | |
116 | const char *path; | |
8e274523 LP |
117 | int r; |
118 | ||
119 | assert(b); | |
120 | assert(pid >= 0); | |
121 | ||
ecedd90f | 122 | if (cgroup_suffix) { |
b7def684 | 123 | p = strjoin(b->path, "/", cgroup_suffix, NULL); |
ecedd90f LP |
124 | if (!p) |
125 | return -ENOMEM; | |
126 | ||
127 | path = p; | |
128 | } else | |
129 | path = b->path; | |
130 | ||
131 | r = cg_create_and_attach(b->controller, path, pid); | |
132 | free(p); | |
133 | ||
134 | if (r < 0) | |
8c6db833 | 135 | return r; |
8e274523 | 136 | |
8c6db833 | 137 | b->realized = true; |
8e274523 LP |
138 | return 0; |
139 | } | |
140 | ||
ecedd90f | 141 | int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid, const char *cgroup_suffix) { |
8e274523 | 142 | CGroupBonding *b; |
8c6db833 | 143 | int r; |
8e274523 | 144 | |
ecedd90f LP |
145 | LIST_FOREACH(by_unit, b, first) { |
146 | r = cgroup_bonding_install(b, pid, cgroup_suffix); | |
147 | if (r < 0 && b->essential) | |
8e274523 | 148 | return r; |
ecedd90f | 149 | } |
8e274523 LP |
150 | |
151 | return 0; | |
152 | } | |
153 | ||
64747e2d LP |
154 | int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) { |
155 | assert(b); | |
156 | ||
157 | if (!b->realized) | |
158 | return -EINVAL; | |
159 | ||
160 | return cg_set_group_access(b->controller, b->path, mode, uid, gid); | |
161 | } | |
162 | ||
163 | int cgroup_bonding_set_group_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) { | |
164 | CGroupBonding *b; | |
165 | int r; | |
166 | ||
167 | LIST_FOREACH(by_unit, b, first) { | |
168 | r = cgroup_bonding_set_group_access(b, mode, uid, gid); | |
169 | if (r < 0) | |
170 | return r; | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
8d53b453 | 176 | int cgroup_bonding_set_task_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid, int sticky) { |
64747e2d LP |
177 | assert(b); |
178 | ||
179 | if (!b->realized) | |
180 | return -EINVAL; | |
181 | ||
8d53b453 | 182 | return cg_set_task_access(b->controller, b->path, mode, uid, gid, sticky); |
64747e2d LP |
183 | } |
184 | ||
8d53b453 | 185 | int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid, int sticky) { |
64747e2d LP |
186 | CGroupBonding *b; |
187 | int r; | |
188 | ||
189 | LIST_FOREACH(by_unit, b, first) { | |
8d53b453 | 190 | r = cgroup_bonding_set_task_access(b, mode, uid, gid, sticky); |
64747e2d LP |
191 | if (r < 0) |
192 | return r; | |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
88f3e0c9 | 198 | int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) { |
ecedd90f LP |
199 | char *p = NULL; |
200 | const char *path; | |
201 | int r; | |
202 | ||
8e274523 | 203 | assert(b); |
8c6db833 | 204 | assert(sig >= 0); |
8e274523 | 205 | |
d686d8a9 | 206 | /* Don't kill cgroups that aren't ours */ |
31e54cc8 | 207 | if (!b->ours) |
d686d8a9 | 208 | return 0; |
8c6db833 | 209 | |
ecedd90f | 210 | if (cgroup_suffix) { |
b7def684 | 211 | p = strjoin(b->path, "/", cgroup_suffix, NULL); |
ecedd90f LP |
212 | if (!p) |
213 | return -ENOMEM; | |
214 | ||
215 | path = p; | |
216 | } else | |
217 | path = b->path; | |
218 | ||
88f3e0c9 | 219 | r = cg_kill_recursive(b->controller, path, sig, sigcont, true, rem, s); |
ecedd90f LP |
220 | free(p); |
221 | ||
222 | return r; | |
8e274523 LP |
223 | } |
224 | ||
88f3e0c9 | 225 | int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) { |
8e274523 | 226 | CGroupBonding *b; |
ca949c9d LP |
227 | Set *allocated_set = NULL; |
228 | int ret = -EAGAIN, r; | |
229 | ||
8f53a7b8 LP |
230 | if (!first) |
231 | return 0; | |
232 | ||
ca949c9d LP |
233 | if (!s) |
234 | if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) | |
235 | return -ENOMEM; | |
8e274523 LP |
236 | |
237 | LIST_FOREACH(by_unit, b, first) { | |
88f3e0c9 | 238 | r = cgroup_bonding_kill(b, sig, sigcont, rem, s, cgroup_suffix); |
ecedd90f | 239 | if (r < 0) { |
8c6db833 | 240 | if (r == -EAGAIN || r == -ESRCH) |
50159e6a | 241 | continue; |
8e274523 | 242 | |
ca949c9d LP |
243 | ret = r; |
244 | goto finish; | |
50159e6a LP |
245 | } |
246 | ||
ca949c9d LP |
247 | if (ret < 0 || r > 0) |
248 | ret = r; | |
8e274523 LP |
249 | } |
250 | ||
ca949c9d LP |
251 | finish: |
252 | if (allocated_set) | |
253 | set_free(allocated_set); | |
254 | ||
255 | return ret; | |
8e274523 LP |
256 | } |
257 | ||
258 | /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we | |
259 | * cannot know */ | |
260 | int cgroup_bonding_is_empty(CGroupBonding *b) { | |
8e274523 LP |
261 | int r; |
262 | ||
263 | assert(b); | |
264 | ||
8c6db833 LP |
265 | if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0) |
266 | return r; | |
8e274523 | 267 | |
8c6db833 LP |
268 | /* If it is empty it is empty */ |
269 | if (r > 0) | |
8e274523 LP |
270 | return 1; |
271 | ||
8c6db833 | 272 | /* It's not only us using this cgroup, so we just don't know */ |
d686d8a9 | 273 | return b->ours ? 0 : -EAGAIN; |
8e274523 LP |
274 | } |
275 | ||
276 | int cgroup_bonding_is_empty_list(CGroupBonding *first) { | |
277 | CGroupBonding *b; | |
278 | ||
279 | LIST_FOREACH(by_unit, b, first) { | |
280 | int r; | |
281 | ||
282 | if ((r = cgroup_bonding_is_empty(b)) < 0) { | |
283 | /* If this returned -EAGAIN, then we don't know if the | |
284 | * group is empty, so let's see if another group can | |
285 | * tell us */ | |
286 | ||
287 | if (r != -EAGAIN) | |
288 | return r; | |
289 | } else | |
290 | return r; | |
291 | } | |
292 | ||
293 | return -EAGAIN; | |
294 | } | |
295 | ||
8e274523 | 296 | int manager_setup_cgroup(Manager *m) { |
c6c18be3 | 297 | char *current = NULL, *path = NULL; |
8e274523 | 298 | int r; |
7ccfb64a | 299 | char suffix[32]; |
8e274523 LP |
300 | |
301 | assert(m); | |
302 | ||
e5a53dc7 | 303 | /* 0. Be nice to Ingo Molnar #628004 */ |
0c85a4f3 | 304 | if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) { |
e5a53dc7 LP |
305 | log_warning("No control group support available, not creating root group."); |
306 | return 0; | |
307 | } | |
308 | ||
35d2e7ec | 309 | /* 1. Determine hierarchy */ |
9156e799 LP |
310 | r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t); |
311 | if (r < 0) { | |
12235040 | 312 | log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); |
c6c18be3 | 313 | goto finish; |
12235040 | 314 | } |
8e274523 | 315 | |
0baf24dd LP |
316 | if (m->running_as == MANAGER_SYSTEM) |
317 | strcpy(suffix, "/system"); | |
318 | else { | |
319 | snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid()); | |
320 | char_array_0(suffix); | |
321 | } | |
7ccfb64a | 322 | |
8e274523 | 323 | free(m->cgroup_hierarchy); |
c6c18be3 | 324 | if (endswith(current, suffix)) { |
7ccfb64a | 325 | /* We probably got reexecuted and can continue to use our root cgroup */ |
c6c18be3 LP |
326 | m->cgroup_hierarchy = current; |
327 | current = NULL; | |
7ccfb64a | 328 | |
c6c18be3 LP |
329 | } else { |
330 | /* We need a new root cgroup */ | |
7ccfb64a | 331 | m->cgroup_hierarchy = NULL; |
e364ad06 | 332 | if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) { |
669241a0 | 333 | log_error("Out of memory."); |
c6c18be3 LP |
334 | r = -ENOMEM; |
335 | goto finish; | |
336 | } | |
8e274523 LP |
337 | } |
338 | ||
35d2e7ec | 339 | /* 2. Show data */ |
3474ae3c LP |
340 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path); |
341 | if (r < 0) { | |
12235040 | 342 | log_error("Cannot find cgroup mount point: %s", strerror(-r)); |
c6c18be3 | 343 | goto finish; |
12235040 | 344 | } |
8e274523 | 345 | |
c6c18be3 LP |
346 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
347 | ||
35d2e7ec | 348 | /* 3. Install agent */ |
3474ae3c LP |
349 | r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); |
350 | if (r < 0) | |
8e274523 | 351 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); |
c6c18be3 LP |
352 | else if (r > 0) |
353 | log_debug("Installed release agent."); | |
8e274523 | 354 | else |
c6c18be3 | 355 | log_debug("Release agent already installed."); |
8e274523 | 356 | |
35d2e7ec | 357 | /* 4. Realize the group */ |
9156e799 LP |
358 | r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0); |
359 | if (r < 0) { | |
8e274523 | 360 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
c6c18be3 LP |
361 | goto finish; |
362 | } | |
363 | ||
35d2e7ec | 364 | /* 5. And pin it, so that it cannot be unmounted */ |
c6c18be3 LP |
365 | if (m->pin_cgroupfs_fd >= 0) |
366 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
367 | ||
9156e799 LP |
368 | m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); |
369 | if (r < 0) { | |
12235040 | 370 | log_error("Failed to open pin file: %m"); |
c6c18be3 LP |
371 | r = -errno; |
372 | goto finish; | |
373 | } | |
374 | ||
375 | log_debug("Created root group."); | |
376 | ||
b59e2465 | 377 | cg_shorten_controllers(m->default_controllers); |
9156e799 | 378 | |
c6c18be3 LP |
379 | finish: |
380 | free(current); | |
381 | free(path); | |
8e274523 LP |
382 | |
383 | return r; | |
384 | } | |
385 | ||
c6c18be3 | 386 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
387 | assert(m); |
388 | ||
c6c18be3 LP |
389 | if (delete && m->cgroup_hierarchy) |
390 | cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy); | |
8e274523 | 391 | |
c6c18be3 LP |
392 | if (m->pin_cgroupfs_fd >= 0) { |
393 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
394 | m->pin_cgroupfs_fd = -1; | |
395 | } | |
396 | ||
397 | free(m->cgroup_hierarchy); | |
398 | m->cgroup_hierarchy = NULL; | |
8e274523 LP |
399 | } |
400 | ||
acb14d31 LP |
401 | int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) { |
402 | CGroupBonding *b; | |
403 | char *p; | |
404 | ||
405 | assert(m); | |
406 | assert(cgroup); | |
407 | assert(bonding); | |
408 | ||
409 | b = hashmap_get(m->cgroup_bondings, cgroup); | |
5c72face | 410 | if (b) { |
acb14d31 LP |
411 | *bonding = b; |
412 | return 1; | |
413 | } | |
414 | ||
415 | p = strdup(cgroup); | |
416 | if (!p) | |
417 | return -ENOMEM; | |
418 | ||
419 | for (;;) { | |
420 | char *e; | |
421 | ||
422 | e = strrchr(p, '/'); | |
423 | if (!e || e == p) { | |
424 | free(p); | |
425 | *bonding = NULL; | |
426 | return 0; | |
427 | } | |
428 | ||
429 | *e = 0; | |
430 | ||
431 | b = hashmap_get(m->cgroup_bondings, p); | |
432 | if (b) { | |
433 | free(p); | |
434 | *bonding = b; | |
435 | return 1; | |
436 | } | |
437 | } | |
438 | } | |
439 | ||
8e274523 LP |
440 | int cgroup_notify_empty(Manager *m, const char *group) { |
441 | CGroupBonding *l, *b; | |
acb14d31 | 442 | int r; |
8e274523 LP |
443 | |
444 | assert(m); | |
445 | assert(group); | |
446 | ||
acb14d31 LP |
447 | r = cgroup_bonding_get(m, group, &l); |
448 | if (r <= 0) | |
449 | return r; | |
8e274523 LP |
450 | |
451 | LIST_FOREACH(by_path, b, l) { | |
452 | int t; | |
453 | ||
454 | if (!b->unit) | |
455 | continue; | |
456 | ||
353fa6a2 LP |
457 | t = cgroup_bonding_is_empty_list(b); |
458 | if (t < 0) { | |
8e274523 LP |
459 | |
460 | /* If we don't know, we don't know */ | |
461 | if (t != -EAGAIN) | |
462 | log_warning("Failed to check whether cgroup is empty: %s", strerror(errno)); | |
463 | ||
464 | continue; | |
465 | } | |
466 | ||
353fa6a2 LP |
467 | if (t > 0) { |
468 | /* If it is empty, let's delete it */ | |
ac155bb8 | 469 | cgroup_bonding_trim_list(b->unit->cgroup_bondings, true); |
353fa6a2 | 470 | |
8e274523 LP |
471 | if (UNIT_VTABLE(b->unit)->cgroup_notify_empty) |
472 | UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit); | |
353fa6a2 | 473 | } |
8e274523 LP |
474 | } |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
8c47c732 LP |
479 | Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) { |
480 | CGroupBonding *l, *b; | |
481 | char *group = NULL; | |
8c47c732 LP |
482 | |
483 | assert(m); | |
484 | ||
485 | if (pid <= 1) | |
486 | return NULL; | |
487 | ||
e364ad06 | 488 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0) |
8c47c732 LP |
489 | return NULL; |
490 | ||
491 | l = hashmap_get(m->cgroup_bondings, group); | |
4455bcd0 LP |
492 | |
493 | if (!l) { | |
494 | char *slash; | |
495 | ||
496 | while ((slash = strrchr(group, '/'))) { | |
497 | if (slash == group) | |
498 | break; | |
499 | ||
500 | *slash = 0; | |
501 | ||
502 | if ((l = hashmap_get(m->cgroup_bondings, group))) | |
503 | break; | |
504 | } | |
505 | } | |
506 | ||
8c47c732 LP |
507 | free(group); |
508 | ||
8c47c732 LP |
509 | LIST_FOREACH(by_path, b, l) { |
510 | ||
511 | if (!b->unit) | |
512 | continue; | |
513 | ||
d686d8a9 | 514 | if (b->ours) |
8c47c732 LP |
515 | return b->unit; |
516 | } | |
517 | ||
518 | return NULL; | |
519 | } | |
520 | ||
8e274523 LP |
521 | CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) { |
522 | CGroupBonding *b; | |
523 | ||
524 | assert(controller); | |
525 | ||
526 | LIST_FOREACH(by_unit, b, first) | |
527 | if (streq(b->controller, controller)) | |
528 | return b; | |
529 | ||
530 | return NULL; | |
531 | } | |
6dde1f33 LP |
532 | |
533 | char *cgroup_bonding_to_string(CGroupBonding *b) { | |
534 | char *r; | |
535 | ||
536 | assert(b); | |
537 | ||
538 | if (asprintf(&r, "%s:%s", b->controller, b->path) < 0) | |
539 | return NULL; | |
540 | ||
541 | return r; | |
542 | } | |
4fbf50b3 LP |
543 | |
544 | pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) { | |
545 | FILE *f; | |
2633eb83 | 546 | pid_t pid = 0, npid, mypid; |
4fbf50b3 LP |
547 | |
548 | assert(b); | |
549 | ||
d686d8a9 | 550 | if (!b->ours) |
4fbf50b3 LP |
551 | return 0; |
552 | ||
bd40a2d8 | 553 | if (cg_enumerate_processes(b->controller, b->path, &f) < 0) |
4fbf50b3 LP |
554 | return 0; |
555 | ||
2633eb83 LP |
556 | mypid = getpid(); |
557 | ||
bd40a2d8 | 558 | while (cg_read_pid(f, &npid) > 0) { |
2633eb83 | 559 | pid_t ppid; |
4fbf50b3 LP |
560 | |
561 | if (npid == pid) | |
562 | continue; | |
563 | ||
2633eb83 LP |
564 | /* Ignore processes that aren't our kids */ |
565 | if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid) | |
566 | continue; | |
567 | ||
4fbf50b3 | 568 | if (pid != 0) { |
2633eb83 LP |
569 | /* Dang, there's more than one daemonized PID |
570 | in this group, so we don't know what process | |
571 | is the main process. */ | |
4fbf50b3 LP |
572 | pid = 0; |
573 | break; | |
574 | } | |
575 | ||
576 | pid = npid; | |
577 | } | |
578 | ||
579 | fclose(f); | |
580 | ||
581 | return pid; | |
582 | } | |
583 | ||
584 | pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) { | |
585 | CGroupBonding *b; | |
586 | pid_t pid; | |
587 | ||
588 | /* Try to find a main pid from this cgroup, but checking if | |
589 | * there's only one PID in the cgroup and returning it. Later | |
590 | * on we might want to add additional, smarter heuristics | |
591 | * here. */ | |
592 | ||
593 | LIST_FOREACH(by_unit, b, first) | |
594 | if ((pid = cgroup_bonding_search_main_pid(b)) != 0) | |
595 | return pid; | |
596 | ||
597 | return 0; | |
598 | ||
599 | } |