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Commit | Line | Data |
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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8c6db833 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 | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <unistd.h> | |
24 | #include <signal.h> | |
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
35d2e7ec | 27 | #include <dirent.h> |
672c48cc LP |
28 | #include <sys/stat.h> |
29 | #include <sys/types.h> | |
e27796a0 | 30 | #include <ftw.h> |
8c6db833 LP |
31 | |
32 | #include "cgroup-util.h" | |
33 | #include "log.h" | |
34 | #include "set.h" | |
35 | #include "macro.h" | |
36 | #include "util.h" | |
37 | ||
c6c18be3 LP |
38 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
39 | char *fs; | |
40 | int r; | |
41 | FILE *f; | |
42 | ||
43 | assert(controller); | |
44 | assert(path); | |
45 | assert(_f); | |
46 | ||
47 | if ((r = cg_get_path(controller, path, "cgroup.procs", &fs)) < 0) | |
48 | return r; | |
49 | ||
50 | f = fopen(fs, "re"); | |
51 | free(fs); | |
52 | ||
53 | if (!f) | |
54 | return -errno; | |
55 | ||
56 | *_f = f; | |
57 | return 0; | |
58 | } | |
59 | ||
60 | int cg_enumerate_tasks(const char *controller, const char *path, FILE **_f) { | |
61 | char *fs; | |
62 | int r; | |
63 | FILE *f; | |
64 | ||
65 | assert(controller); | |
66 | assert(path); | |
67 | assert(_f); | |
68 | ||
69 | if ((r = cg_get_path(controller, path, "tasks", &fs)) < 0) | |
70 | return r; | |
71 | ||
72 | f = fopen(fs, "re"); | |
73 | free(fs); | |
74 | ||
75 | if (!f) | |
76 | return -errno; | |
77 | ||
78 | *_f = f; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | int cg_read_pid(FILE *f, pid_t *_pid) { | |
83 | unsigned long ul; | |
84 | ||
85 | /* Note that the cgroup.procs might contain duplicates! See | |
86 | * cgroups.txt for details. */ | |
87 | ||
88 | errno = 0; | |
89 | if (fscanf(f, "%lu", &ul) != 1) { | |
90 | ||
91 | if (feof(f)) | |
92 | return 0; | |
93 | ||
94 | return errno ? -errno : -EIO; | |
95 | } | |
96 | ||
97 | if (ul <= 0) | |
98 | return -EIO; | |
99 | ||
100 | *_pid = (pid_t) ul; | |
101 | return 1; | |
102 | } | |
103 | ||
35d2e7ec LP |
104 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
105 | char *fs; | |
106 | int r; | |
107 | DIR *d; | |
108 | ||
109 | assert(controller); | |
110 | assert(path); | |
111 | assert(_d); | |
112 | ||
113 | /* This is not recursive! */ | |
114 | ||
115 | if ((r = cg_get_path(controller, path, NULL, &fs)) < 0) | |
116 | return r; | |
117 | ||
118 | d = opendir(fs); | |
119 | free(fs); | |
120 | ||
121 | if (!d) | |
122 | return -errno; | |
123 | ||
124 | *_d = d; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | int cg_read_subgroup(DIR *d, char **fn) { | |
129 | struct dirent *de; | |
130 | ||
131 | assert(d); | |
132 | ||
133 | errno = 0; | |
134 | while ((de = readdir(d))) { | |
135 | char *b; | |
136 | ||
137 | if (de->d_type != DT_DIR) | |
138 | continue; | |
139 | ||
140 | if (streq(de->d_name, ".") || | |
141 | streq(de->d_name, "..")) | |
142 | continue; | |
143 | ||
144 | if (!(b = strdup(de->d_name))) | |
145 | return -ENOMEM; | |
146 | ||
147 | *fn = b; | |
148 | return 1; | |
149 | } | |
150 | ||
151 | if (errno) | |
152 | return -errno; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
ad293f5a | 157 | int cg_rmdir(const char *controller, const char *path, bool honour_sticky) { |
35d2e7ec LP |
158 | char *p; |
159 | int r; | |
160 | ||
ad293f5a LP |
161 | r = cg_get_path(controller, path, NULL, &p); |
162 | if (r < 0) | |
35d2e7ec LP |
163 | return r; |
164 | ||
ad293f5a LP |
165 | if (honour_sticky) { |
166 | char *tasks; | |
167 | ||
168 | /* If the sticky bit is set don't remove the directory */ | |
169 | ||
170 | tasks = strappend(p, "/tasks"); | |
171 | if (!tasks) { | |
172 | free(p); | |
173 | return -ENOMEM; | |
174 | } | |
175 | ||
176 | r = file_is_sticky(tasks); | |
177 | free(tasks); | |
178 | ||
179 | if (r > 0) { | |
180 | free(p); | |
181 | return 0; | |
182 | } | |
183 | } | |
184 | ||
35d2e7ec LP |
185 | r = rmdir(p); |
186 | free(p); | |
187 | ||
ad293f5a | 188 | return (r < 0 && errno != ENOENT) ? -errno : 0; |
35d2e7ec LP |
189 | } |
190 | ||
430c18ed | 191 | int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { |
35d2e7ec | 192 | bool done = false; |
8c6db833 | 193 | int r, ret = 0; |
35d2e7ec | 194 | pid_t my_pid; |
c6c18be3 | 195 | FILE *f = NULL; |
ca949c9d | 196 | Set *allocated_set = NULL; |
8c6db833 LP |
197 | |
198 | assert(controller); | |
199 | assert(path); | |
200 | assert(sig >= 0); | |
201 | ||
202 | /* This goes through the tasks list and kills them all. This | |
203 | * is repeated until no further processes are added to the | |
204 | * tasks list, to properly handle forking processes */ | |
205 | ||
ca949c9d LP |
206 | if (!s) |
207 | if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) | |
208 | return -ENOMEM; | |
8c6db833 LP |
209 | |
210 | my_pid = getpid(); | |
211 | ||
212 | do { | |
0b172489 | 213 | pid_t pid = 0; |
8c6db833 LP |
214 | done = true; |
215 | ||
35d2e7ec | 216 | if ((r = cg_enumerate_processes(controller, path, &f)) < 0) { |
4c633005 | 217 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec LP |
218 | ret = r; |
219 | ||
c6c18be3 | 220 | goto finish; |
35d2e7ec | 221 | } |
c6c18be3 LP |
222 | |
223 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 LP |
224 | |
225 | if (pid == my_pid && ignore_self) | |
c6c18be3 | 226 | continue; |
8c6db833 | 227 | |
c6c18be3 LP |
228 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
229 | continue; | |
8c6db833 LP |
230 | |
231 | /* If we haven't killed this process yet, kill | |
232 | * it */ | |
4c633005 LP |
233 | if (kill(pid, sig) < 0) { |
234 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 235 | ret = -errno; |
430c18ed LP |
236 | } else if (ret == 0) { |
237 | ||
238 | if (sigcont) | |
239 | kill(pid, SIGCONT); | |
240 | ||
35d2e7ec | 241 | ret = 1; |
430c18ed | 242 | } |
8c6db833 | 243 | |
8c6db833 LP |
244 | done = false; |
245 | ||
35d2e7ec LP |
246 | if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) { |
247 | if (ret >= 0) | |
248 | ret = r; | |
249 | ||
250 | goto finish; | |
251 | } | |
252 | } | |
253 | ||
254 | if (r < 0) { | |
255 | if (ret >= 0) | |
256 | ret = r; | |
257 | ||
258 | goto finish; | |
8c6db833 LP |
259 | } |
260 | ||
c6c18be3 LP |
261 | fclose(f); |
262 | f = NULL; | |
8c6db833 LP |
263 | |
264 | /* To avoid racing against processes which fork | |
265 | * quicker than we can kill them we repeat this until | |
266 | * no new pids need to be killed. */ | |
267 | ||
35d2e7ec | 268 | } while (!done); |
8c6db833 | 269 | |
c6c18be3 | 270 | finish: |
ca949c9d LP |
271 | if (allocated_set) |
272 | set_free(allocated_set); | |
8c6db833 | 273 | |
c6c18be3 LP |
274 | if (f) |
275 | fclose(f); | |
8c6db833 | 276 | |
35d2e7ec | 277 | return ret; |
8c6db833 LP |
278 | } |
279 | ||
430c18ed | 280 | int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { |
35d2e7ec LP |
281 | int r, ret = 0; |
282 | DIR *d = NULL; | |
283 | char *fn; | |
ca949c9d | 284 | Set *allocated_set = NULL; |
8c6db833 LP |
285 | |
286 | assert(path); | |
287 | assert(controller); | |
288 | assert(sig >= 0); | |
289 | ||
ca949c9d LP |
290 | if (!s) |
291 | if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) | |
292 | return -ENOMEM; | |
293 | ||
430c18ed | 294 | ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); |
8c6db833 | 295 | |
35d2e7ec | 296 | if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) { |
4c633005 | 297 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec | 298 | ret = r; |
8c6db833 | 299 | |
35d2e7ec LP |
300 | goto finish; |
301 | } | |
8c6db833 | 302 | |
35d2e7ec LP |
303 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
304 | char *p = NULL; | |
8c6db833 | 305 | |
35d2e7ec LP |
306 | r = asprintf(&p, "%s/%s", path, fn); |
307 | free(fn); | |
308 | ||
309 | if (r < 0) { | |
310 | if (ret >= 0) | |
311 | ret = -ENOMEM; | |
8c6db833 | 312 | |
35d2e7ec LP |
313 | goto finish; |
314 | } | |
8c6db833 | 315 | |
430c18ed | 316 | r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); |
35d2e7ec | 317 | free(p); |
8c6db833 | 318 | |
35d2e7ec LP |
319 | if (r != 0 && ret >= 0) |
320 | ret = r; | |
8c6db833 LP |
321 | } |
322 | ||
35d2e7ec LP |
323 | if (r < 0 && ret >= 0) |
324 | ret = r; | |
325 | ||
326 | if (rem) | |
ad293f5a | 327 | if ((r = cg_rmdir(controller, path, true)) < 0) { |
2db9ecac LP |
328 | if (ret >= 0 && |
329 | r != -ENOENT && | |
330 | r != -EBUSY) | |
35d2e7ec LP |
331 | ret = r; |
332 | } | |
8c6db833 | 333 | |
35d2e7ec LP |
334 | finish: |
335 | if (d) | |
336 | closedir(d); | |
8c6db833 | 337 | |
ca949c9d LP |
338 | if (allocated_set) |
339 | set_free(allocated_set); | |
340 | ||
8c6db833 LP |
341 | return ret; |
342 | } | |
343 | ||
35d2e7ec | 344 | int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) { |
8c6db833 LP |
345 | unsigned i; |
346 | ||
347 | assert(path); | |
348 | assert(controller); | |
349 | ||
350 | /* This safely kills all processes; first it sends a SIGTERM, | |
9f452741 LP |
351 | * then checks 8 times after 200ms whether the group is now |
352 | * empty, then kills everything that is left with SIGKILL and | |
353 | * finally checks 5 times after 200ms each whether the group | |
354 | * is finally empty. */ | |
8c6db833 | 355 | |
9f452741 | 356 | for (i = 0; i < 15; i++) { |
1d0ae74a | 357 | int sig, r; |
8c6db833 LP |
358 | |
359 | if (i <= 0) | |
360 | sig = SIGTERM; | |
9f452741 | 361 | else if (i == 9) |
8c6db833 LP |
362 | sig = SIGKILL; |
363 | else | |
364 | sig = 0; | |
365 | ||
430c18ed | 366 | if ((r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL)) <= 0) |
8c6db833 LP |
367 | return r; |
368 | ||
9f452741 | 369 | usleep(200 * USEC_PER_MSEC); |
8c6db833 LP |
370 | } |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self) { | |
35d2e7ec LP |
376 | bool done = false; |
377 | Set *s; | |
8c6db833 LP |
378 | int r, ret = 0; |
379 | pid_t my_pid; | |
c6c18be3 | 380 | FILE *f = NULL; |
8c6db833 LP |
381 | |
382 | assert(controller); | |
383 | assert(from); | |
384 | assert(to); | |
385 | ||
35d2e7ec LP |
386 | if (!(s = set_new(trivial_hash_func, trivial_compare_func))) |
387 | return -ENOMEM; | |
388 | ||
8c6db833 LP |
389 | my_pid = getpid(); |
390 | ||
391 | do { | |
0b172489 | 392 | pid_t pid = 0; |
8c6db833 LP |
393 | done = true; |
394 | ||
35d2e7ec | 395 | if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) { |
4c633005 | 396 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec LP |
397 | ret = r; |
398 | ||
c6c18be3 | 399 | goto finish; |
35d2e7ec | 400 | } |
c6c18be3 LP |
401 | |
402 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 403 | |
35d2e7ec LP |
404 | /* This might do weird stuff if we aren't a |
405 | * single-threaded program. However, we | |
406 | * luckily know we are not */ | |
8c6db833 | 407 | if (pid == my_pid && ignore_self) |
c6c18be3 | 408 | continue; |
8c6db833 | 409 | |
35d2e7ec LP |
410 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
411 | continue; | |
412 | ||
c6c18be3 | 413 | if ((r = cg_attach(controller, to, pid)) < 0) { |
4c633005 | 414 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
415 | ret = r; |
416 | } else if (ret == 0) | |
417 | ret = 1; | |
8c6db833 | 418 | |
8c6db833 | 419 | done = false; |
35d2e7ec LP |
420 | |
421 | if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) { | |
422 | if (ret >= 0) | |
423 | ret = r; | |
424 | ||
425 | goto finish; | |
426 | } | |
427 | } | |
428 | ||
429 | if (r < 0) { | |
430 | if (ret >= 0) | |
431 | ret = r; | |
432 | ||
433 | goto finish; | |
8c6db833 LP |
434 | } |
435 | ||
c6c18be3 LP |
436 | fclose(f); |
437 | f = NULL; | |
8c6db833 | 438 | |
35d2e7ec | 439 | } while (!done); |
8c6db833 | 440 | |
c6c18be3 | 441 | finish: |
35d2e7ec | 442 | set_free(s); |
8c6db833 | 443 | |
c6c18be3 LP |
444 | if (f) |
445 | fclose(f); | |
8c6db833 | 446 | |
35d2e7ec | 447 | return ret; |
8c6db833 LP |
448 | } |
449 | ||
35d2e7ec LP |
450 | int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self, bool rem) { |
451 | int r, ret = 0; | |
452 | DIR *d = NULL; | |
453 | char *fn; | |
8c6db833 LP |
454 | |
455 | assert(controller); | |
456 | assert(from); | |
457 | assert(to); | |
458 | ||
35d2e7ec | 459 | ret = cg_migrate(controller, from, to, ignore_self); |
8c6db833 | 460 | |
35d2e7ec | 461 | if ((r = cg_enumerate_subgroups(controller, from, &d)) < 0) { |
4c633005 | 462 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec LP |
463 | ret = r; |
464 | goto finish; | |
465 | } | |
466 | ||
467 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
468 | char *p = NULL; | |
8c6db833 | 469 | |
35d2e7ec LP |
470 | r = asprintf(&p, "%s/%s", from, fn); |
471 | free(fn); | |
8c6db833 | 472 | |
35d2e7ec LP |
473 | if (r < 0) { |
474 | if (ret >= 0) | |
475 | ret = -ENOMEM; | |
476 | ||
477 | goto finish; | |
8c6db833 LP |
478 | } |
479 | ||
35d2e7ec | 480 | r = cg_migrate_recursive(controller, p, to, ignore_self, rem); |
8c6db833 LP |
481 | free(p); |
482 | ||
35d2e7ec LP |
483 | if (r != 0 && ret >= 0) |
484 | ret = r; | |
8c6db833 LP |
485 | } |
486 | ||
35d2e7ec LP |
487 | if (r < 0 && ret >= 0) |
488 | ret = r; | |
489 | ||
490 | if (rem) | |
ad293f5a | 491 | if ((r = cg_rmdir(controller, from, true)) < 0) { |
2db9ecac LP |
492 | if (ret >= 0 && |
493 | r != -ENOENT && | |
494 | r != -EBUSY) | |
35d2e7ec LP |
495 | ret = r; |
496 | } | |
8c6db833 | 497 | |
35d2e7ec LP |
498 | finish: |
499 | if (d) | |
500 | closedir(d); | |
8c6db833 LP |
501 | |
502 | return ret; | |
503 | } | |
504 | ||
505 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
dbd821ac | 506 | const char *p; |
70132bd0 | 507 | char *t; |
0ac10822 | 508 | static __thread bool good = false; |
8c6db833 LP |
509 | |
510 | assert(controller); | |
dbd821ac LP |
511 | assert(fs); |
512 | ||
3bfc7184 | 513 | if (_unlikely_(!good)) { |
70132bd0 LP |
514 | int r; |
515 | ||
0c85a4f3 | 516 | r = path_is_mount_point("/sys/fs/cgroup", false); |
70132bd0 LP |
517 | if (r <= 0) |
518 | return r < 0 ? r : -ENOENT; | |
519 | ||
520 | /* Cache this to save a few stat()s */ | |
521 | good = true; | |
522 | } | |
523 | ||
524 | if (isempty(controller)) | |
525 | return -EINVAL; | |
526 | ||
dbd821ac LP |
527 | /* This is a very minimal lookup from controller names to |
528 | * paths. Since we have mounted most hierarchies ourselves | |
529 | * should be kinda safe, but eventually we might want to | |
530 | * extend this to have a fallback to actually check | |
531 | * /proc/mounts. Might need caching then. */ | |
532 | ||
533 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
534 | p = "systemd"; | |
535 | else if (startswith(controller, "name=")) | |
536 | p = controller + 5; | |
537 | else | |
538 | p = controller; | |
539 | ||
c6c18be3 | 540 | if (path && suffix) |
70132bd0 | 541 | t = join("/sys/fs/cgroup/", p, "/", path, "/", suffix, NULL); |
c6c18be3 | 542 | else if (path) |
70132bd0 | 543 | t = join("/sys/fs/cgroup/", p, "/", path, NULL); |
c6c18be3 | 544 | else if (suffix) |
70132bd0 LP |
545 | t = join("/sys/fs/cgroup/", p, "/", suffix, NULL); |
546 | else | |
547 | t = join("/sys/fs/cgroup/", p, NULL); | |
548 | ||
549 | if (!t) | |
550 | return -ENOMEM; | |
551 | ||
552 | path_kill_slashes(t); | |
8c6db833 | 553 | |
70132bd0 LP |
554 | *fs = t; |
555 | return 0; | |
8c6db833 LP |
556 | } |
557 | ||
e27796a0 LP |
558 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
559 | char *p; | |
560 | bool is_sticky; | |
561 | ||
562 | if (typeflag != FTW_DP) | |
563 | return 0; | |
564 | ||
565 | if (ftwbuf->level < 1) | |
566 | return 0; | |
567 | ||
568 | p = strappend(path, "/tasks"); | |
569 | if (!p) { | |
570 | errno = ENOMEM; | |
571 | return 1; | |
572 | } | |
573 | ||
574 | is_sticky = file_is_sticky(p) > 0; | |
575 | free(p); | |
576 | ||
577 | if (is_sticky) | |
578 | return 0; | |
579 | ||
580 | rmdir(path); | |
581 | return 0; | |
582 | } | |
583 | ||
8c6db833 LP |
584 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
585 | char *fs; | |
e27796a0 | 586 | int r = 0; |
8c6db833 LP |
587 | |
588 | assert(controller); | |
589 | assert(path); | |
590 | ||
e27796a0 LP |
591 | r = cg_get_path(controller, path, NULL, &fs); |
592 | if (r < 0) | |
8c6db833 LP |
593 | return r; |
594 | ||
e27796a0 LP |
595 | errno = 0; |
596 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) < 0) | |
597 | r = errno ? -errno : -EIO; | |
598 | ||
599 | if (delete_root) { | |
600 | bool is_sticky; | |
601 | char *p; | |
602 | ||
603 | p = strappend(fs, "/tasks"); | |
604 | if (!p) { | |
605 | free(fs); | |
606 | return -ENOMEM; | |
607 | } | |
608 | ||
609 | is_sticky = file_is_sticky(p) > 0; | |
610 | free(p); | |
611 | ||
612 | if (!is_sticky) | |
613 | if (rmdir(fs) < 0 && errno != ENOENT) { | |
614 | if (r == 0) | |
615 | r = -errno; | |
616 | } | |
617 | } | |
618 | ||
8c6db833 LP |
619 | free(fs); |
620 | ||
e27796a0 | 621 | return r; |
8c6db833 LP |
622 | } |
623 | ||
624 | int cg_delete(const char *controller, const char *path) { | |
35d2e7ec | 625 | char *parent; |
8c6db833 LP |
626 | int r; |
627 | ||
628 | assert(controller); | |
629 | assert(path); | |
630 | ||
35d2e7ec LP |
631 | if ((r = parent_of_path(path, &parent)) < 0) |
632 | return r; | |
8c6db833 | 633 | |
35d2e7ec LP |
634 | r = cg_migrate_recursive(controller, path, parent, false, true); |
635 | free(parent); | |
8c6db833 | 636 | |
4c633005 | 637 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
638 | } |
639 | ||
640 | int cg_create(const char *controller, const char *path) { | |
c6c18be3 | 641 | char *fs; |
8c6db833 LP |
642 | int r; |
643 | ||
644 | assert(controller); | |
645 | assert(path); | |
646 | ||
c6c18be3 LP |
647 | if ((r = cg_get_path(controller, path, NULL, &fs)) < 0) |
648 | return r; | |
8c6db833 | 649 | |
672c48cc LP |
650 | r = mkdir_parents(fs, 0755); |
651 | ||
652 | if (r >= 0) { | |
653 | if (mkdir(fs, 0755) >= 0) | |
654 | r = 1; | |
655 | else if (errno == EEXIST) | |
656 | r = 0; | |
657 | else | |
658 | r = -errno; | |
659 | } | |
660 | ||
c6c18be3 | 661 | free(fs); |
8c6db833 LP |
662 | |
663 | return r; | |
664 | } | |
665 | ||
666 | int cg_attach(const char *controller, const char *path, pid_t pid) { | |
c6c18be3 | 667 | char *fs; |
8c6db833 | 668 | int r; |
c6c18be3 | 669 | char c[32]; |
8c6db833 LP |
670 | |
671 | assert(controller); | |
672 | assert(path); | |
673 | assert(pid >= 0); | |
674 | ||
c6c18be3 LP |
675 | if ((r = cg_get_path(controller, path, "tasks", &fs)) < 0) |
676 | return r; | |
8c6db833 LP |
677 | |
678 | if (pid == 0) | |
679 | pid = getpid(); | |
680 | ||
c6c18be3 LP |
681 | snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid); |
682 | char_array_0(c); | |
8c6db833 | 683 | |
c6c18be3 LP |
684 | r = write_one_line_file(fs, c); |
685 | free(fs); | |
8c6db833 LP |
686 | |
687 | return r; | |
688 | } | |
689 | ||
690 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
672c48cc | 691 | int r, q; |
8c6db833 LP |
692 | |
693 | assert(controller); | |
694 | assert(path); | |
695 | assert(pid >= 0); | |
696 | ||
c6c18be3 LP |
697 | if ((r = cg_create(controller, path)) < 0) |
698 | return r; | |
8c6db833 | 699 | |
672c48cc LP |
700 | if ((q = cg_attach(controller, path, pid)) < 0) |
701 | return q; | |
8c6db833 | 702 | |
c6c18be3 | 703 | /* This does not remove the cgroup on failure */ |
8c6db833 LP |
704 | |
705 | return r; | |
706 | } | |
707 | ||
708 | int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid) { | |
709 | char *fs; | |
710 | int r; | |
711 | ||
712 | assert(controller); | |
713 | assert(path); | |
714 | ||
715 | if ((r = cg_get_path(controller, path, NULL, &fs)) < 0) | |
716 | return r; | |
717 | ||
718 | r = chmod_and_chown(fs, mode, uid, gid); | |
719 | free(fs); | |
720 | ||
721 | return r; | |
722 | } | |
723 | ||
724 | int cg_set_task_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid) { | |
725 | char *fs; | |
726 | int r; | |
727 | ||
728 | assert(controller); | |
729 | assert(path); | |
730 | ||
731 | if ((r = cg_get_path(controller, path, "tasks", &fs)) < 0) | |
732 | return r; | |
733 | ||
734 | r = chmod_and_chown(fs, mode, uid, gid); | |
735 | free(fs); | |
736 | ||
737 | return r; | |
738 | } | |
739 | ||
740 | int cg_get_by_pid(const char *controller, pid_t pid, char **path) { | |
741 | int r; | |
742 | char *p = NULL; | |
c6c18be3 LP |
743 | FILE *f; |
744 | char *fs; | |
745 | size_t cs; | |
8c6db833 LP |
746 | |
747 | assert(controller); | |
8c6db833 | 748 | assert(path); |
c6c18be3 | 749 | assert(pid >= 0); |
8c6db833 | 750 | |
c6c18be3 LP |
751 | if (pid == 0) |
752 | pid = getpid(); | |
8c6db833 | 753 | |
c6c18be3 LP |
754 | if (asprintf(&fs, "/proc/%lu/cgroup", (unsigned long) pid) < 0) |
755 | return -ENOMEM; | |
8c6db833 | 756 | |
c6c18be3 LP |
757 | f = fopen(fs, "re"); |
758 | free(fs); | |
759 | ||
4c633005 LP |
760 | if (!f) |
761 | return errno == ENOENT ? -ESRCH : -errno; | |
762 | ||
c6c18be3 LP |
763 | cs = strlen(controller); |
764 | ||
765 | while (!feof(f)) { | |
766 | char line[LINE_MAX]; | |
767 | char *l; | |
768 | ||
769 | errno = 0; | |
770 | if (!(fgets(line, sizeof(line), f))) { | |
771 | if (feof(f)) | |
772 | break; | |
773 | ||
774 | r = errno ? -errno : -EIO; | |
775 | goto finish; | |
776 | } | |
777 | ||
778 | truncate_nl(line); | |
779 | ||
780 | if (!(l = strchr(line, ':'))) | |
781 | continue; | |
782 | ||
783 | l++; | |
784 | if (strncmp(l, controller, cs) != 0) | |
785 | continue; | |
786 | ||
787 | if (l[cs] != ':') | |
788 | continue; | |
789 | ||
790 | if (!(p = strdup(l + cs + 1))) { | |
791 | r = -ENOMEM; | |
792 | goto finish; | |
793 | } | |
794 | ||
795 | *path = p; | |
796 | r = 0; | |
797 | goto finish; | |
798 | } | |
799 | ||
800 | r = -ENOENT; | |
801 | ||
802 | finish: | |
803 | fclose(f); | |
804 | ||
805 | return r; | |
8c6db833 LP |
806 | } |
807 | ||
808 | int cg_install_release_agent(const char *controller, const char *agent) { | |
c6c18be3 | 809 | char *fs = NULL, *contents = NULL, *line = NULL, *sc; |
8c6db833 LP |
810 | int r; |
811 | ||
812 | assert(controller); | |
813 | assert(agent); | |
814 | ||
c6c18be3 LP |
815 | if ((r = cg_get_path(controller, NULL, "release_agent", &fs)) < 0) |
816 | return r; | |
8c6db833 | 817 | |
c6c18be3 | 818 | if ((r = read_one_line_file(fs, &contents)) < 0) |
8c6db833 LP |
819 | goto finish; |
820 | ||
821 | sc = strstrip(contents); | |
8c6db833 LP |
822 | if (sc[0] == 0) { |
823 | ||
824 | if (asprintf(&line, "%s\n", agent) < 0) { | |
825 | r = -ENOMEM; | |
826 | goto finish; | |
827 | } | |
828 | ||
c6c18be3 | 829 | if ((r = write_one_line_file(fs, line)) < 0) |
8c6db833 LP |
830 | goto finish; |
831 | ||
832 | } else if (!streq(sc, agent)) { | |
833 | r = -EEXIST; | |
834 | goto finish; | |
835 | } | |
836 | ||
c6c18be3 LP |
837 | free(fs); |
838 | fs = NULL; | |
e364ad06 | 839 | if ((r = cg_get_path(controller, NULL, "notify_on_release", &fs)) < 0) |
8c6db833 | 840 | goto finish; |
8c6db833 LP |
841 | |
842 | free(contents); | |
843 | contents = NULL; | |
c6c18be3 | 844 | if ((r = read_one_line_file(fs, &contents)) < 0) |
8c6db833 LP |
845 | goto finish; |
846 | ||
847 | sc = strstrip(contents); | |
848 | ||
849 | if (streq(sc, "0")) { | |
c6c18be3 | 850 | if ((r = write_one_line_file(fs, "1\n")) < 0) |
8c6db833 | 851 | goto finish; |
c6c18be3 LP |
852 | |
853 | r = 1; | |
8c6db833 LP |
854 | } else if (!streq(sc, "1")) { |
855 | r = -EIO; | |
856 | goto finish; | |
c6c18be3 LP |
857 | } else |
858 | r = 0; | |
8c6db833 LP |
859 | |
860 | finish: | |
c6c18be3 | 861 | free(fs); |
8c6db833 LP |
862 | free(contents); |
863 | free(line); | |
864 | ||
865 | return r; | |
866 | } | |
867 | ||
868 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { | |
0b172489 | 869 | pid_t pid = 0; |
8c6db833 | 870 | int r; |
0b172489 | 871 | FILE *f = NULL; |
c6c18be3 | 872 | bool found = false; |
8c6db833 LP |
873 | |
874 | assert(controller); | |
875 | assert(path); | |
876 | ||
c6c18be3 | 877 | if ((r = cg_enumerate_tasks(controller, path, &f)) < 0) |
4c633005 | 878 | return r == -ENOENT ? 1 : r; |
8c6db833 | 879 | |
c6c18be3 | 880 | while ((r = cg_read_pid(f, &pid)) > 0) { |
8c6db833 | 881 | |
c6c18be3 LP |
882 | if (ignore_self && pid == getpid()) |
883 | continue; | |
8c6db833 | 884 | |
c6c18be3 LP |
885 | found = true; |
886 | break; | |
8c6db833 LP |
887 | } |
888 | ||
c6c18be3 | 889 | fclose(f); |
8c6db833 | 890 | |
c6c18be3 LP |
891 | if (r < 0) |
892 | return r; | |
8c6db833 | 893 | |
c6c18be3 | 894 | return !found; |
8c6db833 LP |
895 | } |
896 | ||
897 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { | |
35d2e7ec LP |
898 | int r; |
899 | DIR *d = NULL; | |
900 | char *fn; | |
8c6db833 LP |
901 | |
902 | assert(controller); | |
903 | assert(path); | |
904 | ||
35d2e7ec LP |
905 | if ((r = cg_is_empty(controller, path, ignore_self)) <= 0) |
906 | return r; | |
907 | ||
908 | if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) | |
4c633005 | 909 | return r == -ENOENT ? 1 : r; |
8c6db833 | 910 | |
35d2e7ec LP |
911 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
912 | char *p = NULL; | |
8c6db833 | 913 | |
35d2e7ec LP |
914 | r = asprintf(&p, "%s/%s", path, fn); |
915 | free(fn); | |
8c6db833 | 916 | |
35d2e7ec LP |
917 | if (r < 0) { |
918 | r = -ENOMEM; | |
919 | goto finish; | |
8c6db833 LP |
920 | } |
921 | ||
35d2e7ec | 922 | r = cg_is_empty_recursive(controller, p, ignore_self); |
8c6db833 LP |
923 | free(p); |
924 | ||
35d2e7ec LP |
925 | if (r <= 0) |
926 | goto finish; | |
927 | } | |
928 | ||
929 | if (r >= 0) | |
930 | r = 1; | |
931 | ||
932 | finish: | |
933 | ||
934 | if (d) | |
935 | closedir(d); | |
936 | ||
937 | return r; | |
938 | } | |
939 | ||
940 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
941 | const char *e; | |
942 | char *t = NULL, *u = NULL; | |
943 | ||
944 | assert(spec); | |
945 | assert(controller || path); | |
946 | ||
947 | if (*spec == '/') { | |
948 | ||
949 | if (path) { | |
950 | if (!(t = strdup(spec))) | |
951 | return -ENOMEM; | |
952 | ||
953 | *path = t; | |
8c6db833 LP |
954 | } |
955 | ||
35d2e7ec LP |
956 | if (controller) |
957 | *controller = NULL; | |
958 | ||
959 | return 0; | |
8c6db833 LP |
960 | } |
961 | ||
35d2e7ec LP |
962 | if (!(e = strchr(spec, ':'))) { |
963 | ||
964 | if (strchr(spec, '/') || spec[0] == 0) | |
965 | return -EINVAL; | |
966 | ||
967 | if (controller) { | |
968 | if (!(t = strdup(spec))) | |
969 | return -ENOMEM; | |
970 | ||
971 | *controller = t; | |
972 | } | |
973 | ||
974 | if (path) | |
975 | *path = NULL; | |
976 | ||
977 | return 0; | |
8c6db833 LP |
978 | } |
979 | ||
35d2e7ec LP |
980 | if (e[1] != '/' || |
981 | e == spec || | |
982 | memchr(spec, '/', e-spec)) | |
983 | return -EINVAL; | |
8c6db833 | 984 | |
35d2e7ec LP |
985 | if (controller) |
986 | if (!(t = strndup(spec, e-spec))) | |
987 | return -ENOMEM; | |
988 | ||
989 | if (path) | |
990 | if (!(u = strdup(e+1))) { | |
991 | free(t); | |
992 | return -ENOMEM; | |
993 | } | |
994 | ||
995 | if (controller) | |
996 | *controller = t; | |
997 | ||
998 | if (path) | |
999 | *path = u; | |
1000 | ||
1001 | return 0; | |
8c6db833 | 1002 | } |
c6c18be3 | 1003 | |
35d2e7ec LP |
1004 | int cg_join_spec(const char *controller, const char *path, char **spec) { |
1005 | assert(controller); | |
1006 | assert(path); | |
c6c18be3 | 1007 | |
35d2e7ec LP |
1008 | if (!path_is_absolute(path) || |
1009 | controller[0] == 0 || | |
1010 | strchr(controller, ':') || | |
1011 | strchr(controller, '/')) | |
1012 | return -EINVAL; | |
1013 | ||
1014 | if (asprintf(spec, "%s:%s", controller, path) < 0) | |
1015 | return -ENOMEM; | |
c6c18be3 LP |
1016 | |
1017 | return 0; | |
1018 | } | |
35d2e7ec LP |
1019 | |
1020 | int cg_fix_path(const char *path, char **result) { | |
1021 | char *t, *c, *p; | |
1022 | int r; | |
1023 | ||
1024 | assert(path); | |
1025 | assert(result); | |
1026 | ||
1027 | /* First check if it already is a filesystem path */ | |
1028 | if (path_is_absolute(path) && | |
77d5f105 | 1029 | path_startswith(path, "/sys/fs/cgroup") && |
35d2e7ec LP |
1030 | access(path, F_OK) >= 0) { |
1031 | ||
1032 | if (!(t = strdup(path))) | |
1033 | return -ENOMEM; | |
1034 | ||
1035 | *result = t; | |
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | /* Otherwise treat it as cg spec */ | |
1040 | if ((r = cg_split_spec(path, &c, &p)) < 0) | |
1041 | return r; | |
1042 | ||
1043 | r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); | |
1044 | free(c); | |
1045 | free(p); | |
1046 | ||
1047 | return r; | |
1048 | } | |
1f73f0f1 LP |
1049 | |
1050 | int cg_get_user_path(char **path) { | |
1051 | char *root, *p; | |
1052 | ||
1053 | assert(path); | |
1054 | ||
1055 | /* Figure out the place to put user cgroups below. We use the | |
1056 | * same as PID 1 has but with the "/system" suffix replaced by | |
1057 | * "/user" */ | |
1058 | ||
1059 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root) < 0) | |
1060 | p = strdup("/user"); | |
1061 | else { | |
1062 | if (endswith(root, "/system")) | |
1063 | root[strlen(root) - 7] = 0; | |
1064 | else if (streq(root, "/")) | |
1065 | root[0] = 0; | |
1066 | ||
1067 | p = strappend(root, "/user"); | |
1068 | free(root); | |
1069 | } | |
1070 | ||
1071 | if (!p) | |
1072 | return -ENOMEM; | |
1073 | ||
1074 | *path = p; | |
1075 | return 0; | |
1076 | } |