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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 | |
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 | |
8c6db833 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. |
8c6db833 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8c6db833 LP |
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" | |
9eb977db | 37 | #include "path-util.h" |
b59e2465 | 38 | #include "strv.h" |
ef1673d1 | 39 | #include "unit-name.h" |
a5c32cff | 40 | #include "fileio.h" |
9444b1f2 | 41 | #include "special.h" |
1434ae6f | 42 | #include "mkdir.h" |
8c6db833 | 43 | |
c6c18be3 | 44 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
7027ff61 | 45 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 46 | FILE *f; |
7027ff61 | 47 | int r; |
c6c18be3 | 48 | |
c6c18be3 LP |
49 | assert(_f); |
50 | ||
c3175a7f LP |
51 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
52 | if (r < 0) | |
c6c18be3 LP |
53 | return r; |
54 | ||
55 | f = fopen(fs, "re"); | |
c6c18be3 LP |
56 | if (!f) |
57 | return -errno; | |
58 | ||
59 | *_f = f; | |
60 | return 0; | |
61 | } | |
62 | ||
c6c18be3 LP |
63 | int cg_read_pid(FILE *f, pid_t *_pid) { |
64 | unsigned long ul; | |
65 | ||
66 | /* Note that the cgroup.procs might contain duplicates! See | |
67 | * cgroups.txt for details. */ | |
68 | ||
7027ff61 LP |
69 | assert(f); |
70 | assert(_pid); | |
71 | ||
c6c18be3 LP |
72 | errno = 0; |
73 | if (fscanf(f, "%lu", &ul) != 1) { | |
74 | ||
75 | if (feof(f)) | |
76 | return 0; | |
77 | ||
78 | return errno ? -errno : -EIO; | |
79 | } | |
80 | ||
81 | if (ul <= 0) | |
82 | return -EIO; | |
83 | ||
84 | *_pid = (pid_t) ul; | |
85 | return 1; | |
86 | } | |
87 | ||
35d2e7ec | 88 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
7027ff61 | 89 | _cleanup_free_ char *fs = NULL; |
35d2e7ec LP |
90 | int r; |
91 | DIR *d; | |
92 | ||
35d2e7ec LP |
93 | assert(_d); |
94 | ||
95 | /* This is not recursive! */ | |
96 | ||
c3175a7f LP |
97 | r = cg_get_path(controller, path, NULL, &fs); |
98 | if (r < 0) | |
35d2e7ec LP |
99 | return r; |
100 | ||
101 | d = opendir(fs); | |
35d2e7ec LP |
102 | if (!d) |
103 | return -errno; | |
104 | ||
105 | *_d = d; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | int cg_read_subgroup(DIR *d, char **fn) { | |
110 | struct dirent *de; | |
111 | ||
112 | assert(d); | |
7027ff61 | 113 | assert(fn); |
35d2e7ec | 114 | |
7027ff61 | 115 | FOREACH_DIRENT(de, d, return -errno) { |
35d2e7ec LP |
116 | char *b; |
117 | ||
118 | if (de->d_type != DT_DIR) | |
119 | continue; | |
120 | ||
121 | if (streq(de->d_name, ".") || | |
122 | streq(de->d_name, "..")) | |
123 | continue; | |
124 | ||
7027ff61 LP |
125 | b = strdup(de->d_name); |
126 | if (!b) | |
35d2e7ec LP |
127 | return -ENOMEM; |
128 | ||
129 | *fn = b; | |
130 | return 1; | |
131 | } | |
132 | ||
35d2e7ec LP |
133 | return 0; |
134 | } | |
135 | ||
4ad49000 | 136 | int cg_rmdir(const char *controller, const char *path) { |
7027ff61 | 137 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
138 | int r; |
139 | ||
ad293f5a LP |
140 | r = cg_get_path(controller, path, NULL, &p); |
141 | if (r < 0) | |
35d2e7ec LP |
142 | return r; |
143 | ||
144 | r = rmdir(p); | |
7027ff61 LP |
145 | if (r < 0 && errno != ENOENT) |
146 | return -errno; | |
35d2e7ec | 147 | |
7027ff61 | 148 | return 0; |
35d2e7ec LP |
149 | } |
150 | ||
430c18ed | 151 | int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { |
7027ff61 | 152 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 153 | bool done = false; |
8c6db833 | 154 | int r, ret = 0; |
35d2e7ec | 155 | pid_t my_pid; |
8c6db833 | 156 | |
8c6db833 LP |
157 | assert(sig >= 0); |
158 | ||
159 | /* This goes through the tasks list and kills them all. This | |
160 | * is repeated until no further processes are added to the | |
161 | * tasks list, to properly handle forking processes */ | |
162 | ||
7027ff61 | 163 | if (!s) { |
d5099efc | 164 | s = allocated_set = set_new(NULL); |
7027ff61 | 165 | if (!s) |
ca949c9d | 166 | return -ENOMEM; |
7027ff61 | 167 | } |
8c6db833 LP |
168 | |
169 | my_pid = getpid(); | |
170 | ||
171 | do { | |
7027ff61 | 172 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 173 | pid_t pid = 0; |
8c6db833 LP |
174 | done = true; |
175 | ||
7027ff61 LP |
176 | r = cg_enumerate_processes(controller, path, &f); |
177 | if (r < 0) { | |
4c633005 | 178 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 179 | return r; |
35d2e7ec | 180 | |
7027ff61 | 181 | return ret; |
35d2e7ec | 182 | } |
c6c18be3 LP |
183 | |
184 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 185 | |
7027ff61 | 186 | if (ignore_self && pid == my_pid) |
c6c18be3 | 187 | continue; |
8c6db833 | 188 | |
c6c18be3 LP |
189 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
190 | continue; | |
8c6db833 LP |
191 | |
192 | /* If we haven't killed this process yet, kill | |
193 | * it */ | |
4c633005 LP |
194 | if (kill(pid, sig) < 0) { |
195 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 196 | ret = -errno; |
6e8314c4 | 197 | } else { |
dc8962da | 198 | if (sigcont && sig != SIGKILL) |
430c18ed LP |
199 | kill(pid, SIGCONT); |
200 | ||
6e8314c4 LP |
201 | if (ret == 0) |
202 | ret = 1; | |
430c18ed | 203 | } |
8c6db833 | 204 | |
8c6db833 LP |
205 | done = false; |
206 | ||
7027ff61 LP |
207 | r = set_put(s, LONG_TO_PTR(pid)); |
208 | if (r < 0) { | |
35d2e7ec | 209 | if (ret >= 0) |
7027ff61 | 210 | return r; |
35d2e7ec | 211 | |
7027ff61 | 212 | return ret; |
35d2e7ec LP |
213 | } |
214 | } | |
215 | ||
216 | if (r < 0) { | |
217 | if (ret >= 0) | |
7027ff61 | 218 | return r; |
35d2e7ec | 219 | |
7027ff61 | 220 | return ret; |
8c6db833 LP |
221 | } |
222 | ||
8c6db833 LP |
223 | /* To avoid racing against processes which fork |
224 | * quicker than we can kill them we repeat this until | |
225 | * no new pids need to be killed. */ | |
226 | ||
35d2e7ec | 227 | } while (!done); |
8c6db833 | 228 | |
35d2e7ec | 229 | return ret; |
8c6db833 LP |
230 | } |
231 | ||
430c18ed | 232 | int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { |
7027ff61 LP |
233 | _cleanup_set_free_ Set *allocated_set = NULL; |
234 | _cleanup_closedir_ DIR *d = NULL; | |
35d2e7ec | 235 | int r, ret = 0; |
35d2e7ec | 236 | char *fn; |
8c6db833 LP |
237 | |
238 | assert(path); | |
8c6db833 LP |
239 | assert(sig >= 0); |
240 | ||
7027ff61 | 241 | if (!s) { |
d5099efc | 242 | s = allocated_set = set_new(NULL); |
7027ff61 | 243 | if (!s) |
ca949c9d | 244 | return -ENOMEM; |
7027ff61 | 245 | } |
ca949c9d | 246 | |
430c18ed | 247 | ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); |
8c6db833 | 248 | |
7027ff61 LP |
249 | r = cg_enumerate_subgroups(controller, path, &d); |
250 | if (r < 0) { | |
4c633005 | 251 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 252 | return r; |
8c6db833 | 253 | |
7027ff61 | 254 | return ret; |
35d2e7ec | 255 | } |
8c6db833 | 256 | |
35d2e7ec | 257 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 258 | _cleanup_free_ char *p = NULL; |
8c6db833 | 259 | |
7027ff61 | 260 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 261 | free(fn); |
7027ff61 LP |
262 | if (!p) |
263 | return -ENOMEM; | |
8c6db833 | 264 | |
430c18ed | 265 | r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); |
7027ff61 | 266 | if (ret >= 0 && r != 0) |
35d2e7ec | 267 | ret = r; |
8c6db833 LP |
268 | } |
269 | ||
7027ff61 | 270 | if (ret >= 0 && r < 0) |
35d2e7ec LP |
271 | ret = r; |
272 | ||
7027ff61 | 273 | if (rem) { |
4ad49000 | 274 | r = cg_rmdir(controller, path); |
7027ff61 LP |
275 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
276 | return r; | |
277 | } | |
ca949c9d | 278 | |
8c6db833 LP |
279 | return ret; |
280 | } | |
281 | ||
246aa6dd | 282 | int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) { |
35d2e7ec | 283 | bool done = false; |
246aa6dd | 284 | _cleanup_set_free_ Set *s = NULL; |
8c6db833 LP |
285 | int r, ret = 0; |
286 | pid_t my_pid; | |
287 | ||
246aa6dd LP |
288 | assert(cfrom); |
289 | assert(pfrom); | |
290 | assert(cto); | |
291 | assert(pto); | |
8c6db833 | 292 | |
d5099efc | 293 | s = set_new(NULL); |
246aa6dd | 294 | if (!s) |
35d2e7ec LP |
295 | return -ENOMEM; |
296 | ||
8c6db833 LP |
297 | my_pid = getpid(); |
298 | ||
299 | do { | |
7027ff61 | 300 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 301 | pid_t pid = 0; |
8c6db833 LP |
302 | done = true; |
303 | ||
b043cd0b | 304 | r = cg_enumerate_processes(cfrom, pfrom, &f); |
246aa6dd | 305 | if (r < 0) { |
4c633005 | 306 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 307 | return r; |
35d2e7ec | 308 | |
246aa6dd | 309 | return ret; |
35d2e7ec | 310 | } |
c6c18be3 LP |
311 | |
312 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 313 | |
35d2e7ec LP |
314 | /* This might do weird stuff if we aren't a |
315 | * single-threaded program. However, we | |
316 | * luckily know we are not */ | |
7027ff61 | 317 | if (ignore_self && pid == my_pid) |
c6c18be3 | 318 | continue; |
8c6db833 | 319 | |
35d2e7ec LP |
320 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
321 | continue; | |
322 | ||
246aa6dd LP |
323 | r = cg_attach(cto, pto, pid); |
324 | if (r < 0) { | |
4c633005 | 325 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
326 | ret = r; |
327 | } else if (ret == 0) | |
328 | ret = 1; | |
8c6db833 | 329 | |
8c6db833 | 330 | done = false; |
35d2e7ec | 331 | |
246aa6dd LP |
332 | r = set_put(s, LONG_TO_PTR(pid)); |
333 | if (r < 0) { | |
35d2e7ec | 334 | if (ret >= 0) |
7027ff61 | 335 | return r; |
35d2e7ec | 336 | |
246aa6dd | 337 | return ret; |
35d2e7ec LP |
338 | } |
339 | } | |
340 | ||
341 | if (r < 0) { | |
342 | if (ret >= 0) | |
7027ff61 | 343 | return r; |
35d2e7ec | 344 | |
246aa6dd | 345 | return ret; |
8c6db833 | 346 | } |
35d2e7ec | 347 | } while (!done); |
8c6db833 | 348 | |
35d2e7ec | 349 | return ret; |
8c6db833 LP |
350 | } |
351 | ||
4ad49000 LP |
352 | int cg_migrate_recursive( |
353 | const char *cfrom, | |
354 | const char *pfrom, | |
355 | const char *cto, | |
356 | const char *pto, | |
357 | bool ignore_self, | |
358 | bool rem) { | |
359 | ||
246aa6dd | 360 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 361 | int r, ret = 0; |
35d2e7ec | 362 | char *fn; |
8c6db833 | 363 | |
246aa6dd LP |
364 | assert(cfrom); |
365 | assert(pfrom); | |
366 | assert(cto); | |
367 | assert(pto); | |
8c6db833 | 368 | |
246aa6dd | 369 | ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self); |
8c6db833 | 370 | |
246aa6dd LP |
371 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
372 | if (r < 0) { | |
4c633005 | 373 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
374 | return r; |
375 | ||
246aa6dd | 376 | return ret; |
35d2e7ec LP |
377 | } |
378 | ||
379 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 380 | _cleanup_free_ char *p = NULL; |
8c6db833 | 381 | |
246aa6dd | 382 | p = strjoin(pfrom, "/", fn, NULL); |
35d2e7ec | 383 | free(fn); |
246aa6dd | 384 | if (!p) { |
35d2e7ec | 385 | if (ret >= 0) |
7027ff61 | 386 | return -ENOMEM; |
35d2e7ec | 387 | |
246aa6dd | 388 | return ret; |
8c6db833 LP |
389 | } |
390 | ||
246aa6dd | 391 | r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem); |
35d2e7ec LP |
392 | if (r != 0 && ret >= 0) |
393 | ret = r; | |
8c6db833 LP |
394 | } |
395 | ||
35d2e7ec LP |
396 | if (r < 0 && ret >= 0) |
397 | ret = r; | |
398 | ||
246aa6dd | 399 | if (rem) { |
4ad49000 | 400 | r = cg_rmdir(cfrom, pfrom); |
246aa6dd LP |
401 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
402 | return r; | |
403 | } | |
8c6db833 LP |
404 | |
405 | return ret; | |
406 | } | |
407 | ||
13b84ec7 LP |
408 | int cg_migrate_recursive_fallback( |
409 | const char *cfrom, | |
410 | const char *pfrom, | |
411 | const char *cto, | |
412 | const char *pto, | |
413 | bool ignore_self, | |
414 | bool rem) { | |
415 | ||
416 | int r; | |
417 | ||
418 | assert(cfrom); | |
419 | assert(pfrom); | |
420 | assert(cto); | |
421 | assert(pto); | |
422 | ||
423 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem); | |
424 | if (r < 0) { | |
425 | char prefix[strlen(pto) + 1]; | |
426 | ||
427 | /* This didn't work? Then let's try all prefixes of the destination */ | |
428 | ||
fecffe5d | 429 | PATH_FOREACH_PREFIX(prefix, pto) { |
13b84ec7 LP |
430 | r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem); |
431 | if (r >= 0) | |
432 | break; | |
433 | } | |
434 | } | |
435 | ||
fecffe5d | 436 | return 0; |
13b84ec7 LP |
437 | } |
438 | ||
3474ae3c LP |
439 | static const char *normalize_controller(const char *controller) { |
440 | ||
7027ff61 LP |
441 | assert(controller); |
442 | ||
3474ae3c LP |
443 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
444 | return "systemd"; | |
445 | else if (startswith(controller, "name=")) | |
446 | return controller + 5; | |
447 | else | |
448 | return controller; | |
449 | } | |
450 | ||
451 | static int join_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
018ef268 | 452 | char *t = NULL; |
3474ae3c | 453 | |
9444b1f2 LP |
454 | if (!isempty(controller)) { |
455 | if (!isempty(path) && !isempty(suffix)) | |
b7def684 | 456 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL); |
9444b1f2 | 457 | else if (!isempty(path)) |
b7def684 | 458 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL); |
9444b1f2 | 459 | else if (!isempty(suffix)) |
b7def684 | 460 | t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL); |
c3175a7f | 461 | else |
7027ff61 | 462 | t = strappend("/sys/fs/cgroup/", controller); |
c3175a7f | 463 | } else { |
9444b1f2 | 464 | if (!isempty(path) && !isempty(suffix)) |
b7def684 | 465 | t = strjoin(path, "/", suffix, NULL); |
9444b1f2 | 466 | else if (!isempty(path)) |
c3175a7f | 467 | t = strdup(path); |
7027ff61 LP |
468 | else |
469 | return -EINVAL; | |
c3175a7f | 470 | } |
3474ae3c LP |
471 | |
472 | if (!t) | |
473 | return -ENOMEM; | |
474 | ||
dbb9401d | 475 | *fs = path_kill_slashes(t); |
3474ae3c LP |
476 | return 0; |
477 | } | |
478 | ||
8c6db833 | 479 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
dbd821ac | 480 | const char *p; |
ec202eae | 481 | static thread_local bool good = false; |
8c6db833 | 482 | |
dbd821ac LP |
483 | assert(fs); |
484 | ||
78edb35a LP |
485 | if (controller && !cg_controller_is_valid(controller, true)) |
486 | return -EINVAL; | |
487 | ||
3bfc7184 | 488 | if (_unlikely_(!good)) { |
70132bd0 LP |
489 | int r; |
490 | ||
0c85a4f3 | 491 | r = path_is_mount_point("/sys/fs/cgroup", false); |
70132bd0 LP |
492 | if (r <= 0) |
493 | return r < 0 ? r : -ENOENT; | |
494 | ||
495 | /* Cache this to save a few stat()s */ | |
496 | good = true; | |
497 | } | |
498 | ||
c3175a7f | 499 | p = controller ? normalize_controller(controller) : NULL; |
7027ff61 | 500 | |
3474ae3c LP |
501 | return join_path(p, path, suffix, fs); |
502 | } | |
dbd821ac | 503 | |
7027ff61 | 504 | static int check_hierarchy(const char *p) { |
b12afc8c | 505 | const char *cc; |
37099707 LP |
506 | |
507 | assert(p); | |
508 | ||
b12afc8c LP |
509 | if (!filename_is_valid(p)) |
510 | return 0; | |
511 | ||
37099707 | 512 | /* Check if this controller actually really exists */ |
63c372cb | 513 | cc = strjoina("/sys/fs/cgroup/", p); |
b12afc8c | 514 | if (laccess(cc, F_OK) < 0) |
37099707 LP |
515 | return -errno; |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
3474ae3c LP |
520 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
521 | const char *p; | |
37099707 | 522 | int r; |
dbd821ac | 523 | |
3474ae3c | 524 | assert(fs); |
70132bd0 | 525 | |
78edb35a | 526 | if (!cg_controller_is_valid(controller, true)) |
3474ae3c | 527 | return -EINVAL; |
70132bd0 | 528 | |
37099707 | 529 | /* Normalize the controller syntax */ |
3474ae3c | 530 | p = normalize_controller(controller); |
8c6db833 | 531 | |
3474ae3c | 532 | /* Check if this controller actually really exists */ |
7027ff61 | 533 | r = check_hierarchy(p); |
37099707 LP |
534 | if (r < 0) |
535 | return r; | |
3474ae3c LP |
536 | |
537 | return join_path(p, path, suffix, fs); | |
8c6db833 LP |
538 | } |
539 | ||
e27796a0 | 540 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
4ad49000 LP |
541 | assert(path); |
542 | assert(sb); | |
543 | assert(ftwbuf); | |
e27796a0 LP |
544 | |
545 | if (typeflag != FTW_DP) | |
546 | return 0; | |
547 | ||
548 | if (ftwbuf->level < 1) | |
549 | return 0; | |
550 | ||
e27796a0 LP |
551 | rmdir(path); |
552 | return 0; | |
553 | } | |
554 | ||
8c6db833 | 555 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 556 | _cleanup_free_ char *fs = NULL; |
e27796a0 | 557 | int r = 0; |
8c6db833 | 558 | |
8c6db833 LP |
559 | assert(path); |
560 | ||
e27796a0 LP |
561 | r = cg_get_path(controller, path, NULL, &fs); |
562 | if (r < 0) | |
8c6db833 LP |
563 | return r; |
564 | ||
e27796a0 | 565 | errno = 0; |
7027ff61 | 566 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) |
e27796a0 LP |
567 | r = errno ? -errno : -EIO; |
568 | ||
569 | if (delete_root) { | |
4ad49000 LP |
570 | if (rmdir(fs) < 0 && errno != ENOENT) |
571 | return -errno; | |
e27796a0 LP |
572 | } |
573 | ||
e27796a0 | 574 | return r; |
8c6db833 LP |
575 | } |
576 | ||
577 | int cg_delete(const char *controller, const char *path) { | |
7027ff61 | 578 | _cleanup_free_ char *parent = NULL; |
8c6db833 LP |
579 | int r; |
580 | ||
8c6db833 LP |
581 | assert(path); |
582 | ||
7027ff61 LP |
583 | r = path_get_parent(path, &parent); |
584 | if (r < 0) | |
35d2e7ec | 585 | return r; |
8c6db833 | 586 | |
246aa6dd | 587 | r = cg_migrate_recursive(controller, path, controller, parent, false, true); |
4c633005 | 588 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
589 | } |
590 | ||
1434ae6f LP |
591 | int cg_create(const char *controller, const char *path) { |
592 | _cleanup_free_ char *fs = NULL; | |
593 | int r; | |
594 | ||
595 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
596 | if (r < 0) | |
597 | return r; | |
598 | ||
599 | r = mkdir_parents(fs, 0755); | |
600 | if (r < 0) | |
601 | return r; | |
602 | ||
603 | if (mkdir(fs, 0755) < 0) { | |
604 | ||
605 | if (errno == EEXIST) | |
606 | return 0; | |
607 | ||
608 | return -errno; | |
609 | } | |
610 | ||
611 | return 1; | |
612 | } | |
613 | ||
614 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
615 | int r, q; | |
616 | ||
617 | assert(pid >= 0); | |
618 | ||
619 | r = cg_create(controller, path); | |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
623 | q = cg_attach(controller, path, pid); | |
624 | if (q < 0) | |
625 | return q; | |
626 | ||
627 | /* This does not remove the cgroup on failure */ | |
628 | return r; | |
629 | } | |
630 | ||
8c6db833 | 631 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
632 | _cleanup_free_ char *fs = NULL; |
633 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
634 | int r; |
635 | ||
8c6db833 LP |
636 | assert(path); |
637 | assert(pid >= 0); | |
638 | ||
b043cd0b | 639 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
3474ae3c | 640 | if (r < 0) |
c6c18be3 | 641 | return r; |
8c6db833 LP |
642 | |
643 | if (pid == 0) | |
644 | pid = getpid(); | |
645 | ||
de0671ee | 646 | snprintf(c, sizeof(c), PID_FMT"\n", pid); |
8c6db833 | 647 | |
70c949a4 | 648 | return write_string_file_no_create(fs, c); |
8c6db833 LP |
649 | } |
650 | ||
13b84ec7 LP |
651 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
652 | int r; | |
653 | ||
654 | assert(controller); | |
655 | assert(path); | |
656 | assert(pid >= 0); | |
657 | ||
658 | r = cg_attach(controller, path, pid); | |
659 | if (r < 0) { | |
660 | char prefix[strlen(path) + 1]; | |
661 | ||
662 | /* This didn't work? Then let's try all prefixes of | |
663 | * the destination */ | |
664 | ||
fecffe5d | 665 | PATH_FOREACH_PREFIX(prefix, path) { |
13b84ec7 LP |
666 | r = cg_attach(controller, prefix, pid); |
667 | if (r >= 0) | |
668 | break; | |
669 | } | |
670 | } | |
671 | ||
fecffe5d | 672 | return 0; |
13b84ec7 LP |
673 | } |
674 | ||
2d76d14e LP |
675 | int cg_set_group_access( |
676 | const char *controller, | |
677 | const char *path, | |
678 | mode_t mode, | |
679 | uid_t uid, | |
680 | gid_t gid) { | |
681 | ||
574d5f2d | 682 | _cleanup_free_ char *fs = NULL; |
8c6db833 LP |
683 | int r; |
684 | ||
8c6db833 LP |
685 | assert(path); |
686 | ||
fed1e721 | 687 | if (mode != MODE_INVALID) |
8d53b453 LP |
688 | mode &= 0777; |
689 | ||
690 | r = cg_get_path(controller, path, NULL, &fs); | |
691 | if (r < 0) | |
8c6db833 LP |
692 | return r; |
693 | ||
574d5f2d | 694 | return chmod_and_chown(fs, mode, uid, gid); |
8c6db833 LP |
695 | } |
696 | ||
974efc46 LP |
697 | int cg_set_task_access( |
698 | const char *controller, | |
699 | const char *path, | |
700 | mode_t mode, | |
701 | uid_t uid, | |
4ad49000 | 702 | gid_t gid) { |
974efc46 LP |
703 | |
704 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
8c6db833 LP |
705 | int r; |
706 | ||
8c6db833 LP |
707 | assert(path); |
708 | ||
fed1e721 | 709 | if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
8d53b453 LP |
710 | return 0; |
711 | ||
fed1e721 | 712 | if (mode != MODE_INVALID) |
8d53b453 LP |
713 | mode &= 0666; |
714 | ||
b043cd0b | 715 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
8d53b453 | 716 | if (r < 0) |
8c6db833 LP |
717 | return r; |
718 | ||
719 | r = chmod_and_chown(fs, mode, uid, gid); | |
974efc46 LP |
720 | if (r < 0) |
721 | return r; | |
8c6db833 | 722 | |
b043cd0b LP |
723 | /* Compatibility, Always keep values for "tasks" in sync with |
724 | * "cgroup.procs" */ | |
725 | r = cg_get_path(controller, path, "tasks", &procs); | |
974efc46 LP |
726 | if (r < 0) |
727 | return r; | |
728 | ||
729 | return chmod_and_chown(procs, mode, uid, gid); | |
8c6db833 LP |
730 | } |
731 | ||
7027ff61 | 732 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
7027ff61 LP |
733 | _cleanup_fclose_ FILE *f = NULL; |
734 | char line[LINE_MAX]; | |
8af8afd6 | 735 | const char *fs; |
c6c18be3 | 736 | size_t cs; |
8c6db833 | 737 | |
8c6db833 | 738 | assert(path); |
c6c18be3 | 739 | assert(pid >= 0); |
8c6db833 | 740 | |
8af8afd6 LP |
741 | if (controller) { |
742 | if (!cg_controller_is_valid(controller, true)) | |
743 | return -EINVAL; | |
78edb35a | 744 | |
8af8afd6 LP |
745 | controller = normalize_controller(controller); |
746 | } else | |
7027ff61 LP |
747 | controller = SYSTEMD_CGROUP_CONTROLLER; |
748 | ||
b68fa010 | 749 | fs = procfs_file_alloca(pid, "cgroup"); |
8c6db833 | 750 | |
c6c18be3 | 751 | f = fopen(fs, "re"); |
4c633005 LP |
752 | if (!f) |
753 | return errno == ENOENT ? -ESRCH : -errno; | |
754 | ||
c6c18be3 LP |
755 | cs = strlen(controller); |
756 | ||
7027ff61 | 757 | FOREACH_LINE(line, f, return -errno) { |
a2a5291b | 758 | char *l, *p, *e; |
8af8afd6 | 759 | size_t k; |
a2a5291b | 760 | const char *word, *state; |
8af8afd6 | 761 | bool found = false; |
c6c18be3 LP |
762 | |
763 | truncate_nl(line); | |
764 | ||
7027ff61 LP |
765 | l = strchr(line, ':'); |
766 | if (!l) | |
c6c18be3 LP |
767 | continue; |
768 | ||
769 | l++; | |
8af8afd6 LP |
770 | e = strchr(l, ':'); |
771 | if (!e) | |
c6c18be3 LP |
772 | continue; |
773 | ||
8af8afd6 LP |
774 | *e = 0; |
775 | ||
a2a5291b | 776 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { |
8af8afd6 | 777 | |
a2a5291b | 778 | if (k == cs && memcmp(word, controller, cs) == 0) { |
8af8afd6 LP |
779 | found = true; |
780 | break; | |
781 | } | |
782 | ||
783 | if (k == 5 + cs && | |
a2a5291b ZJS |
784 | memcmp(word, "name=", 5) == 0 && |
785 | memcmp(word+5, controller, cs) == 0) { | |
8af8afd6 LP |
786 | found = true; |
787 | break; | |
788 | } | |
789 | } | |
790 | ||
791 | if (!found) | |
c6c18be3 LP |
792 | continue; |
793 | ||
8af8afd6 | 794 | p = strdup(e + 1); |
7027ff61 LP |
795 | if (!p) |
796 | return -ENOMEM; | |
c6c18be3 LP |
797 | |
798 | *path = p; | |
7027ff61 | 799 | return 0; |
c6c18be3 LP |
800 | } |
801 | ||
7027ff61 | 802 | return -ENOENT; |
8c6db833 LP |
803 | } |
804 | ||
805 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 LP |
806 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
807 | char *sc; | |
8c6db833 LP |
808 | int r; |
809 | ||
8c6db833 LP |
810 | assert(agent); |
811 | ||
7027ff61 LP |
812 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
813 | if (r < 0) | |
c6c18be3 | 814 | return r; |
8c6db833 | 815 | |
7027ff61 LP |
816 | r = read_one_line_file(fs, &contents); |
817 | if (r < 0) | |
818 | return r; | |
8c6db833 LP |
819 | |
820 | sc = strstrip(contents); | |
8c6db833 | 821 | if (sc[0] == 0) { |
70c949a4 | 822 | r = write_string_file_no_create(fs, agent); |
574d5f2d | 823 | if (r < 0) |
7027ff61 LP |
824 | return r; |
825 | } else if (!streq(sc, agent)) | |
826 | return -EEXIST; | |
8c6db833 | 827 | |
c6c18be3 LP |
828 | free(fs); |
829 | fs = NULL; | |
7027ff61 LP |
830 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
831 | if (r < 0) | |
832 | return r; | |
8c6db833 LP |
833 | |
834 | free(contents); | |
835 | contents = NULL; | |
7027ff61 LP |
836 | r = read_one_line_file(fs, &contents); |
837 | if (r < 0) | |
838 | return r; | |
8c6db833 LP |
839 | |
840 | sc = strstrip(contents); | |
8c6db833 | 841 | if (streq(sc, "0")) { |
70c949a4 | 842 | r = write_string_file_no_create(fs, "1"); |
7027ff61 LP |
843 | if (r < 0) |
844 | return r; | |
c6c18be3 | 845 | |
7027ff61 LP |
846 | return 1; |
847 | } | |
8c6db833 | 848 | |
7027ff61 LP |
849 | if (!streq(sc, "1")) |
850 | return -EIO; | |
8c6db833 | 851 | |
7027ff61 | 852 | return 0; |
8c6db833 LP |
853 | } |
854 | ||
ad929bcc KS |
855 | int cg_uninstall_release_agent(const char *controller) { |
856 | _cleanup_free_ char *fs = NULL; | |
857 | int r; | |
858 | ||
ac9ef333 LP |
859 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
860 | if (r < 0) | |
861 | return r; | |
862 | ||
70c949a4 | 863 | r = write_string_file_no_create(fs, "0"); |
ac9ef333 LP |
864 | if (r < 0) |
865 | return r; | |
866 | ||
867 | free(fs); | |
868 | fs = NULL; | |
869 | ||
ad929bcc KS |
870 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
871 | if (r < 0) | |
872 | return r; | |
873 | ||
70c949a4 | 874 | r = write_string_file_no_create(fs, ""); |
ad929bcc KS |
875 | if (r < 0) |
876 | return r; | |
877 | ||
ac9ef333 | 878 | return 0; |
ad929bcc KS |
879 | } |
880 | ||
8c6db833 | 881 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { |
7027ff61 | 882 | _cleanup_fclose_ FILE *f = NULL; |
c3175a7f | 883 | pid_t pid = 0, self_pid; |
c6c18be3 | 884 | bool found = false; |
7027ff61 | 885 | int r; |
8c6db833 | 886 | |
8c6db833 LP |
887 | assert(path); |
888 | ||
b043cd0b | 889 | r = cg_enumerate_processes(controller, path, &f); |
c3175a7f | 890 | if (r < 0) |
4c633005 | 891 | return r == -ENOENT ? 1 : r; |
8c6db833 | 892 | |
c3175a7f LP |
893 | self_pid = getpid(); |
894 | ||
c6c18be3 | 895 | while ((r = cg_read_pid(f, &pid)) > 0) { |
8c6db833 | 896 | |
c3175a7f | 897 | if (ignore_self && pid == self_pid) |
c6c18be3 | 898 | continue; |
8c6db833 | 899 | |
c6c18be3 LP |
900 | found = true; |
901 | break; | |
8c6db833 LP |
902 | } |
903 | ||
c6c18be3 LP |
904 | if (r < 0) |
905 | return r; | |
8c6db833 | 906 | |
c6c18be3 | 907 | return !found; |
8c6db833 LP |
908 | } |
909 | ||
910 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { | |
7027ff61 | 911 | _cleanup_closedir_ DIR *d = NULL; |
35d2e7ec | 912 | char *fn; |
7027ff61 | 913 | int r; |
8c6db833 | 914 | |
8c6db833 LP |
915 | assert(path); |
916 | ||
c3175a7f LP |
917 | r = cg_is_empty(controller, path, ignore_self); |
918 | if (r <= 0) | |
35d2e7ec LP |
919 | return r; |
920 | ||
c3175a7f LP |
921 | r = cg_enumerate_subgroups(controller, path, &d); |
922 | if (r < 0) | |
4c633005 | 923 | return r == -ENOENT ? 1 : r; |
8c6db833 | 924 | |
35d2e7ec | 925 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 926 | _cleanup_free_ char *p = NULL; |
8c6db833 | 927 | |
7027ff61 | 928 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 929 | free(fn); |
7027ff61 LP |
930 | if (!p) |
931 | return -ENOMEM; | |
8c6db833 | 932 | |
35d2e7ec | 933 | r = cg_is_empty_recursive(controller, p, ignore_self); |
35d2e7ec | 934 | if (r <= 0) |
7027ff61 | 935 | return r; |
35d2e7ec LP |
936 | } |
937 | ||
7027ff61 LP |
938 | if (r < 0) |
939 | return r; | |
35d2e7ec | 940 | |
7027ff61 | 941 | return 1; |
35d2e7ec LP |
942 | } |
943 | ||
944 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
945 | const char *e; | |
946 | char *t = NULL, *u = NULL; | |
5954c074 | 947 | _cleanup_free_ char *v = NULL; |
35d2e7ec LP |
948 | |
949 | assert(spec); | |
35d2e7ec LP |
950 | |
951 | if (*spec == '/') { | |
e884315e LP |
952 | if (!path_is_safe(spec)) |
953 | return -EINVAL; | |
35d2e7ec LP |
954 | |
955 | if (path) { | |
246aa6dd LP |
956 | t = strdup(spec); |
957 | if (!t) | |
35d2e7ec LP |
958 | return -ENOMEM; |
959 | ||
dbb9401d | 960 | *path = path_kill_slashes(t); |
8c6db833 LP |
961 | } |
962 | ||
35d2e7ec LP |
963 | if (controller) |
964 | *controller = NULL; | |
965 | ||
966 | return 0; | |
8c6db833 LP |
967 | } |
968 | ||
246aa6dd LP |
969 | e = strchr(spec, ':'); |
970 | if (!e) { | |
78edb35a | 971 | if (!cg_controller_is_valid(spec, true)) |
35d2e7ec LP |
972 | return -EINVAL; |
973 | ||
974 | if (controller) { | |
5954c074 | 975 | t = strdup(normalize_controller(spec)); |
246aa6dd | 976 | if (!t) |
35d2e7ec LP |
977 | return -ENOMEM; |
978 | ||
979 | *controller = t; | |
980 | } | |
981 | ||
982 | if (path) | |
983 | *path = NULL; | |
984 | ||
985 | return 0; | |
8c6db833 LP |
986 | } |
987 | ||
5954c074 LP |
988 | v = strndup(spec, e-spec); |
989 | if (!v) | |
990 | return -ENOMEM; | |
991 | t = strdup(normalize_controller(v)); | |
e884315e LP |
992 | if (!t) |
993 | return -ENOMEM; | |
78edb35a | 994 | if (!cg_controller_is_valid(t, true)) { |
e884315e | 995 | free(t); |
35d2e7ec | 996 | return -EINVAL; |
246aa6dd LP |
997 | } |
998 | ||
baa89da4 LP |
999 | if (streq(e+1, "")) { |
1000 | u = strdup("/"); | |
1001 | if (!u) { | |
1002 | free(t); | |
1003 | return -ENOMEM; | |
1004 | } | |
1005 | } else { | |
1006 | u = strdup(e+1); | |
1007 | if (!u) { | |
1008 | free(t); | |
1009 | return -ENOMEM; | |
1010 | } | |
35d2e7ec | 1011 | |
baa89da4 LP |
1012 | if (!path_is_safe(u) || |
1013 | !path_is_absolute(u)) { | |
1014 | free(t); | |
1015 | free(u); | |
1016 | return -EINVAL; | |
1017 | } | |
1018 | ||
1019 | path_kill_slashes(u); | |
1020 | } | |
5954c074 | 1021 | |
35d2e7ec LP |
1022 | if (controller) |
1023 | *controller = t; | |
e884315e LP |
1024 | else |
1025 | free(t); | |
35d2e7ec LP |
1026 | |
1027 | if (path) | |
1028 | *path = u; | |
e884315e LP |
1029 | else |
1030 | free(u); | |
35d2e7ec LP |
1031 | |
1032 | return 0; | |
8c6db833 | 1033 | } |
c6c18be3 | 1034 | |
7027ff61 | 1035 | int cg_mangle_path(const char *path, char **result) { |
78edb35a LP |
1036 | _cleanup_free_ char *c = NULL, *p = NULL; |
1037 | char *t; | |
35d2e7ec LP |
1038 | int r; |
1039 | ||
1040 | assert(path); | |
1041 | assert(result); | |
1042 | ||
73e231ab | 1043 | /* First, check if it already is a filesystem path */ |
7027ff61 | 1044 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 1045 | |
b69d29ce LP |
1046 | t = strdup(path); |
1047 | if (!t) | |
35d2e7ec LP |
1048 | return -ENOMEM; |
1049 | ||
dbb9401d | 1050 | *result = path_kill_slashes(t); |
35d2e7ec LP |
1051 | return 0; |
1052 | } | |
1053 | ||
73e231ab | 1054 | /* Otherwise, treat it as cg spec */ |
b69d29ce LP |
1055 | r = cg_split_spec(path, &c, &p); |
1056 | if (r < 0) | |
35d2e7ec LP |
1057 | return r; |
1058 | ||
78edb35a | 1059 | return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); |
35d2e7ec | 1060 | } |
1f73f0f1 | 1061 | |
7027ff61 | 1062 | int cg_get_root_path(char **path) { |
9444b1f2 | 1063 | char *p, *e; |
7027ff61 LP |
1064 | int r; |
1065 | ||
1066 | assert(path); | |
1067 | ||
9444b1f2 | 1068 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1069 | if (r < 0) |
1070 | return r; | |
1071 | ||
9444b1f2 LP |
1072 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); |
1073 | if (e) | |
7027ff61 LP |
1074 | *e = 0; |
1075 | ||
1f73f0f1 LP |
1076 | *path = p; |
1077 | return 0; | |
1078 | } | |
b59e2465 | 1079 | |
751bc6ac LP |
1080 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
1081 | _cleanup_free_ char *rt = NULL; | |
1082 | char *p; | |
ba1261bc LP |
1083 | int r; |
1084 | ||
e9174f29 | 1085 | assert(cgroup); |
751bc6ac | 1086 | assert(shifted); |
e9174f29 LP |
1087 | |
1088 | if (!root) { | |
1089 | /* If the root was specified let's use that, otherwise | |
1090 | * let's determine it from PID 1 */ | |
1091 | ||
751bc6ac | 1092 | r = cg_get_root_path(&rt); |
e9174f29 LP |
1093 | if (r < 0) |
1094 | return r; | |
1095 | ||
751bc6ac | 1096 | root = rt; |
e9174f29 | 1097 | } |
ba1261bc | 1098 | |
751bc6ac LP |
1099 | p = path_startswith(cgroup, root); |
1100 | if (p) | |
1101 | *shifted = p - 1; | |
1102 | else | |
1103 | *shifted = cgroup; | |
1104 | ||
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { | |
1109 | _cleanup_free_ char *raw = NULL; | |
1110 | const char *c; | |
1111 | int r; | |
1112 | ||
1113 | assert(pid >= 0); | |
1114 | assert(cgroup); | |
1115 | ||
1116 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
7027ff61 | 1117 | if (r < 0) |
ba1261bc | 1118 | return r; |
ba1261bc | 1119 | |
751bc6ac LP |
1120 | r = cg_shift_path(raw, root, &c); |
1121 | if (r < 0) | |
1122 | return r; | |
ba1261bc | 1123 | |
751bc6ac LP |
1124 | if (c == raw) { |
1125 | *cgroup = raw; | |
1126 | raw = NULL; | |
1127 | } else { | |
1128 | char *n; | |
ba1261bc | 1129 | |
751bc6ac LP |
1130 | n = strdup(c); |
1131 | if (!n) | |
ba1261bc | 1132 | return -ENOMEM; |
ba1261bc | 1133 | |
751bc6ac LP |
1134 | *cgroup = n; |
1135 | } | |
ba1261bc LP |
1136 | |
1137 | return 0; | |
1138 | } | |
1139 | ||
7027ff61 | 1140 | int cg_path_decode_unit(const char *cgroup, char **unit){ |
d7bd3de0 | 1141 | char *e, *c, *s; |
ef1673d1 MT |
1142 | |
1143 | assert(cgroup); | |
6c03089c | 1144 | assert(unit); |
ef1673d1 | 1145 | |
6c03089c LP |
1146 | e = strchrnul(cgroup, '/'); |
1147 | c = strndupa(cgroup, e - cgroup); | |
ae018d9b | 1148 | c = cg_unescape(c); |
ef1673d1 | 1149 | |
f78e6385 | 1150 | if (!unit_name_is_valid(c, TEMPLATE_INVALID)) |
6c03089c | 1151 | return -EINVAL; |
ef1673d1 | 1152 | |
d7bd3de0 | 1153 | s = strdup(c); |
6c03089c LP |
1154 | if (!s) |
1155 | return -ENOMEM; | |
1156 | ||
1157 | *unit = s; | |
ef1673d1 MT |
1158 | return 0; |
1159 | } | |
1160 | ||
9444b1f2 | 1161 | static const char *skip_slices(const char *p) { |
9444b1f2 LP |
1162 | /* Skips over all slice assignments */ |
1163 | ||
1164 | for (;;) { | |
1021b21b LP |
1165 | size_t n; |
1166 | ||
9444b1f2 LP |
1167 | p += strspn(p, "/"); |
1168 | ||
1169 | n = strcspn(p, "/"); | |
1170 | if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) | |
1171 | return p; | |
1172 | ||
1173 | p += n; | |
1174 | } | |
1175 | } | |
1176 | ||
6c03089c LP |
1177 | int cg_path_get_unit(const char *path, char **unit) { |
1178 | const char *e; | |
1179 | ||
1180 | assert(path); | |
1181 | assert(unit); | |
1182 | ||
9444b1f2 | 1183 | e = skip_slices(path); |
6c03089c | 1184 | |
7027ff61 | 1185 | return cg_path_decode_unit(e, unit); |
6c03089c LP |
1186 | } |
1187 | ||
1188 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
7fd1b19b | 1189 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1190 | int r; |
ba1261bc | 1191 | |
ef1673d1 MT |
1192 | assert(unit); |
1193 | ||
7027ff61 | 1194 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1195 | if (r < 0) |
1196 | return r; | |
1197 | ||
6c03089c LP |
1198 | return cg_path_get_unit(cgroup, unit); |
1199 | } | |
ef1673d1 | 1200 | |
d4fffc4b ZJS |
1201 | /** |
1202 | * Skip session-*.scope, but require it to be there. | |
1203 | */ | |
9444b1f2 LP |
1204 | static const char *skip_session(const char *p) { |
1205 | size_t n; | |
1206 | ||
1207 | assert(p); | |
1208 | ||
1209 | p += strspn(p, "/"); | |
1210 | ||
1211 | n = strcspn(p, "/"); | |
d4fffc4b ZJS |
1212 | if (n < strlen("session-x.scope") || memcmp(p, "session-", 8) != 0 || memcmp(p + n - 6, ".scope", 6) != 0) |
1213 | return NULL; | |
1214 | ||
1215 | p += n; | |
1216 | p += strspn(p, "/"); | |
1217 | ||
1218 | return p; | |
1219 | } | |
1220 | ||
1221 | /** | |
1222 | * Skip user@*.service, but require it to be there. | |
1223 | */ | |
1224 | static const char *skip_user_manager(const char *p) { | |
1225 | size_t n; | |
1226 | ||
1227 | assert(p); | |
1228 | ||
1229 | p += strspn(p, "/"); | |
1230 | ||
1231 | n = strcspn(p, "/"); | |
1232 | if (n < strlen("user@x.service") || memcmp(p, "user@", 5) != 0 || memcmp(p + n - 8, ".service", 8) != 0) | |
6c03089c | 1233 | return NULL; |
ef1673d1 | 1234 | |
9444b1f2 LP |
1235 | p += n; |
1236 | p += strspn(p, "/"); | |
1237 | ||
1238 | return p; | |
1239 | } | |
1240 | ||
6c03089c | 1241 | int cg_path_get_user_unit(const char *path, char **unit) { |
d4fffc4b | 1242 | const char *e, *t; |
ef1673d1 | 1243 | |
6c03089c | 1244 | assert(path); |
ba1261bc LP |
1245 | assert(unit); |
1246 | ||
6c03089c LP |
1247 | /* We always have to parse the path from the beginning as unit |
1248 | * cgroups might have arbitrary child cgroups and we shouldn't get | |
1249 | * confused by those */ | |
ba1261bc | 1250 | |
9444b1f2 LP |
1251 | /* Skip slices, if there are any */ |
1252 | e = skip_slices(path); | |
ba1261bc | 1253 | |
d4fffc4b ZJS |
1254 | /* Skip the session scope... */ |
1255 | t = skip_session(e); | |
1256 | if (t) | |
1257 | /* ... and skip more slices if there's one */ | |
1258 | e = skip_slices(t); | |
1259 | else { | |
1260 | /* ... or require a user manager unit to be there */ | |
1261 | e = skip_user_manager(e); | |
1262 | if (!e) | |
1263 | return -ENOENT; | |
1264 | } | |
6c03089c | 1265 | |
7027ff61 | 1266 | return cg_path_decode_unit(e, unit); |
ef1673d1 | 1267 | } |
ba1261bc | 1268 | |
ef1673d1 | 1269 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
7fd1b19b | 1270 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1271 | int r; |
1272 | ||
1273 | assert(unit); | |
1274 | ||
7027ff61 | 1275 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1276 | if (r < 0) |
1277 | return r; | |
1278 | ||
1279 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1280 | } |
e884315e | 1281 | |
7027ff61 | 1282 | int cg_path_get_machine_name(const char *path, char **machine) { |
89f7c846 LP |
1283 | _cleanup_free_ char *u = NULL, *sl = NULL; |
1284 | int r; | |
374ec6ab | 1285 | |
89f7c846 LP |
1286 | r = cg_path_get_unit(path, &u); |
1287 | if (r < 0) | |
1288 | return r; | |
7027ff61 | 1289 | |
89f7c846 LP |
1290 | sl = strjoin("/run/systemd/machines/unit:", u, NULL); |
1291 | if (!sl) | |
ae018d9b | 1292 | return -ENOMEM; |
aff38e74 | 1293 | |
89f7c846 | 1294 | return readlink_malloc(sl, machine); |
7027ff61 LP |
1295 | } |
1296 | ||
1297 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
7fd1b19b | 1298 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1299 | int r; |
1300 | ||
1301 | assert(machine); | |
1302 | ||
1303 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1304 | if (r < 0) | |
1305 | return r; | |
1306 | ||
1307 | return cg_path_get_machine_name(cgroup, machine); | |
1308 | } | |
1309 | ||
1310 | int cg_path_get_session(const char *path, char **session) { | |
a13ee4c7 | 1311 | const char *e, *n, *x, *y; |
af08d2f9 | 1312 | char *s; |
7027ff61 LP |
1313 | |
1314 | assert(path); | |
7027ff61 | 1315 | |
9444b1f2 LP |
1316 | /* Skip slices, if there are any */ |
1317 | e = skip_slices(path); | |
7027ff61 | 1318 | |
7027ff61 | 1319 | n = strchrnul(e, '/'); |
374ec6ab | 1320 | if (e == n) |
7027ff61 | 1321 | return -ENOENT; |
374ec6ab LP |
1322 | |
1323 | s = strndupa(e, n - e); | |
1324 | s = cg_unescape(s); | |
1325 | ||
1326 | x = startswith(s, "session-"); | |
1327 | if (!x) | |
1328 | return -ENOENT; | |
a13ee4c7 ZJS |
1329 | y = endswith(x, ".scope"); |
1330 | if (!y || x == y) | |
374ec6ab LP |
1331 | return -ENOENT; |
1332 | ||
af08d2f9 LP |
1333 | if (session) { |
1334 | char *r; | |
1335 | ||
a13ee4c7 | 1336 | r = strndup(x, y - x); |
af08d2f9 LP |
1337 | if (!r) |
1338 | return -ENOMEM; | |
1339 | ||
1340 | *session = r; | |
1341 | } | |
7027ff61 | 1342 | |
7027ff61 LP |
1343 | return 0; |
1344 | } | |
1345 | ||
1346 | int cg_pid_get_session(pid_t pid, char **session) { | |
7fd1b19b | 1347 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1348 | int r; |
1349 | ||
7027ff61 LP |
1350 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1351 | if (r < 0) | |
1352 | return r; | |
1353 | ||
1354 | return cg_path_get_session(cgroup, session); | |
1355 | } | |
1356 | ||
ae018d9b | 1357 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
374ec6ab | 1358 | _cleanup_free_ char *slice = NULL; |
674eb685 | 1359 | const char *start, *end; |
ae018d9b | 1360 | char *s; |
674eb685 | 1361 | uid_t u; |
374ec6ab | 1362 | int r; |
ae018d9b LP |
1363 | |
1364 | assert(path); | |
ae018d9b | 1365 | |
374ec6ab LP |
1366 | r = cg_path_get_slice(path, &slice); |
1367 | if (r < 0) | |
1368 | return r; | |
ae018d9b | 1369 | |
674eb685 LP |
1370 | start = startswith(slice, "user-"); |
1371 | if (!start) | |
ae018d9b | 1372 | return -ENOENT; |
674eb685 LP |
1373 | end = endswith(slice, ".slice"); |
1374 | if (!end) | |
ae018d9b LP |
1375 | return -ENOENT; |
1376 | ||
674eb685 | 1377 | s = strndupa(start, end - start); |
ae018d9b | 1378 | if (!s) |
674eb685 | 1379 | return -ENOENT; |
ae018d9b | 1380 | |
674eb685 LP |
1381 | if (parse_uid(s, &u) < 0) |
1382 | return -EIO; | |
1383 | ||
1384 | if (uid) | |
1385 | *uid = u; | |
1386 | ||
1387 | return 0; | |
ae018d9b LP |
1388 | } |
1389 | ||
1390 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1391 | _cleanup_free_ char *cgroup = NULL; | |
1392 | int r; | |
1393 | ||
ae018d9b LP |
1394 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1395 | if (r < 0) | |
1396 | return r; | |
1397 | ||
1398 | return cg_path_get_owner_uid(cgroup, uid); | |
1399 | } | |
1400 | ||
1021b21b LP |
1401 | int cg_path_get_slice(const char *p, char **slice) { |
1402 | const char *e = NULL; | |
1403 | size_t m = 0; | |
1404 | ||
1405 | assert(p); | |
1406 | assert(slice); | |
1407 | ||
1408 | for (;;) { | |
1409 | size_t n; | |
1410 | ||
1411 | p += strspn(p, "/"); | |
1412 | ||
1413 | n = strcspn(p, "/"); | |
1414 | if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) { | |
1415 | char *s; | |
1416 | ||
1417 | if (!e) | |
1418 | return -ENOENT; | |
1419 | ||
1420 | s = strndup(e, m); | |
1421 | if (!s) | |
1422 | return -ENOMEM; | |
1423 | ||
1424 | *slice = s; | |
1425 | return 0; | |
1426 | } | |
1427 | ||
1428 | e = p; | |
1429 | m = n; | |
1430 | ||
1431 | p += n; | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1436 | _cleanup_free_ char *cgroup = NULL; | |
1437 | int r; | |
1438 | ||
1439 | assert(slice); | |
1440 | ||
1441 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1442 | if (r < 0) | |
1443 | return r; | |
1444 | ||
1445 | return cg_path_get_slice(cgroup, slice); | |
1446 | } | |
1447 | ||
ae018d9b LP |
1448 | char *cg_escape(const char *p) { |
1449 | bool need_prefix = false; | |
1450 | ||
1451 | /* This implements very minimal escaping for names to be used | |
1452 | * as file names in the cgroup tree: any name which might | |
1453 | * conflict with a kernel name or is prefixed with '_' is | |
1454 | * prefixed with a '_'. That way, when reading cgroup names it | |
1455 | * is sufficient to remove a single prefixing underscore if | |
1456 | * there is one. */ | |
1457 | ||
1458 | /* The return value of this function (unlike cg_unescape()) | |
1459 | * needs free()! */ | |
1460 | ||
a0ab5665 LP |
1461 | if (p[0] == 0 || |
1462 | p[0] == '_' || | |
1463 | p[0] == '.' || | |
1464 | streq(p, "notify_on_release") || | |
1465 | streq(p, "release_agent") || | |
1466 | streq(p, "tasks")) | |
ae018d9b LP |
1467 | need_prefix = true; |
1468 | else { | |
1469 | const char *dot; | |
1470 | ||
1471 | dot = strrchr(p, '.'); | |
1472 | if (dot) { | |
1473 | ||
1474 | if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0) | |
1475 | need_prefix = true; | |
1476 | else { | |
1477 | char *n; | |
1478 | ||
1479 | n = strndupa(p, dot - p); | |
1480 | ||
1481 | if (check_hierarchy(n) >= 0) | |
1482 | need_prefix = true; | |
1483 | } | |
1484 | } | |
1485 | } | |
1486 | ||
1487 | if (need_prefix) | |
1488 | return strappend("_", p); | |
1489 | else | |
1490 | return strdup(p); | |
1491 | } | |
1492 | ||
1493 | char *cg_unescape(const char *p) { | |
1494 | assert(p); | |
1495 | ||
1496 | /* The return value of this function (unlike cg_escape()) | |
1497 | * doesn't need free()! */ | |
1498 | ||
1499 | if (p[0] == '_') | |
1500 | return (char*) p+1; | |
1501 | ||
1502 | return (char*) p; | |
1503 | } | |
78edb35a LP |
1504 | |
1505 | #define CONTROLLER_VALID \ | |
4b549144 | 1506 | DIGITS LETTERS \ |
78edb35a LP |
1507 | "_" |
1508 | ||
1509 | bool cg_controller_is_valid(const char *p, bool allow_named) { | |
1510 | const char *t, *s; | |
1511 | ||
1512 | if (!p) | |
1513 | return false; | |
1514 | ||
1515 | if (allow_named) { | |
1516 | s = startswith(p, "name="); | |
1517 | if (s) | |
1518 | p = s; | |
1519 | } | |
1520 | ||
1521 | if (*p == 0 || *p == '_') | |
1522 | return false; | |
1523 | ||
1524 | for (t = p; *t; t++) | |
1525 | if (!strchr(CONTROLLER_VALID, *t)) | |
1526 | return false; | |
1527 | ||
1528 | if (t - p > FILENAME_MAX) | |
1529 | return false; | |
1530 | ||
1531 | return true; | |
1532 | } | |
a016b922 LP |
1533 | |
1534 | int cg_slice_to_path(const char *unit, char **ret) { | |
1535 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1536 | const char *dash; | |
1537 | ||
1538 | assert(unit); | |
1539 | assert(ret); | |
1540 | ||
f78e6385 | 1541 | if (!unit_name_is_valid(unit, TEMPLATE_INVALID)) |
a016b922 LP |
1542 | return -EINVAL; |
1543 | ||
1544 | if (!endswith(unit, ".slice")) | |
1545 | return -EINVAL; | |
1546 | ||
1547 | p = unit_name_to_prefix(unit); | |
1548 | if (!p) | |
1549 | return -ENOMEM; | |
1550 | ||
1551 | dash = strchr(p, '-'); | |
1552 | while (dash) { | |
1553 | _cleanup_free_ char *escaped = NULL; | |
1554 | char n[dash - p + sizeof(".slice")]; | |
1555 | ||
1556 | strcpy(stpncpy(n, p, dash - p), ".slice"); | |
1557 | ||
f78e6385 | 1558 | if (!unit_name_is_valid(n, TEMPLATE_INVALID)) |
a016b922 LP |
1559 | return -EINVAL; |
1560 | ||
1561 | escaped = cg_escape(n); | |
1562 | if (!escaped) | |
1563 | return -ENOMEM; | |
1564 | ||
1565 | if (!strextend(&s, escaped, "/", NULL)) | |
1566 | return -ENOMEM; | |
1567 | ||
1568 | dash = strchr(dash+1, '-'); | |
1569 | } | |
1570 | ||
1571 | e = cg_escape(unit); | |
1572 | if (!e) | |
1573 | return -ENOMEM; | |
1574 | ||
1575 | if (!strextend(&s, e, NULL)) | |
1576 | return -ENOMEM; | |
1577 | ||
1578 | *ret = s; | |
1579 | s = NULL; | |
1580 | ||
1581 | return 0; | |
1582 | } | |
4ad49000 LP |
1583 | |
1584 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
1585 | _cleanup_free_ char *p = NULL; | |
1586 | int r; | |
1587 | ||
1588 | r = cg_get_path(controller, path, attribute, &p); | |
1589 | if (r < 0) | |
1590 | return r; | |
1591 | ||
70c949a4 | 1592 | return write_string_file_no_create(p, value); |
4ad49000 LP |
1593 | } |
1594 | ||
934277fe LP |
1595 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
1596 | _cleanup_free_ char *p = NULL; | |
1597 | int r; | |
1598 | ||
1599 | r = cg_get_path(controller, path, attribute, &p); | |
1600 | if (r < 0) | |
1601 | return r; | |
1602 | ||
1603 | return read_one_line_file(p, ret); | |
1604 | } | |
1605 | ||
4ad49000 LP |
1606 | static const char mask_names[] = |
1607 | "cpu\0" | |
1608 | "cpuacct\0" | |
1609 | "blkio\0" | |
1610 | "memory\0" | |
1611 | "devices\0"; | |
1612 | ||
13b84ec7 | 1613 | int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) { |
4ad49000 LP |
1614 | CGroupControllerMask bit = 1; |
1615 | const char *n; | |
1616 | int r; | |
1617 | ||
1618 | /* This one will create a cgroup in our private tree, but also | |
1619 | * duplicate it in the trees specified in mask, and remove it | |
1620 | * in all others */ | |
1621 | ||
1622 | /* First create the cgroup in our own hierarchy. */ | |
1623 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
1624 | if (r < 0) | |
1625 | return r; | |
1626 | ||
1627 | /* Then, do the same in the other hierarchies */ | |
1628 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 | 1629 | if (mask & bit) |
4ad49000 | 1630 | cg_create(n, path); |
13b84ec7 | 1631 | else if (supported & bit) |
4ad49000 LP |
1632 | cg_trim(n, path, true); |
1633 | ||
1634 | bit <<= 1; | |
1635 | } | |
1636 | ||
13b84ec7 | 1637 | return 0; |
4ad49000 LP |
1638 | } |
1639 | ||
7b3fd631 | 1640 | int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { |
4ad49000 LP |
1641 | CGroupControllerMask bit = 1; |
1642 | const char *n; | |
1643 | int r; | |
1644 | ||
1645 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
13b84ec7 LP |
1646 | if (r < 0) |
1647 | return r; | |
4ad49000 LP |
1648 | |
1649 | NULSTR_FOREACH(n, mask_names) { | |
7b3fd631 LP |
1650 | |
1651 | if (supported & bit) { | |
1652 | const char *p = NULL; | |
1653 | ||
1654 | if (path_callback) | |
1655 | p = path_callback(bit, userdata); | |
1656 | ||
1657 | if (!p) | |
1658 | p = path; | |
1659 | ||
13b84ec7 | 1660 | cg_attach_fallback(n, path, pid); |
7b3fd631 | 1661 | } |
4ad49000 LP |
1662 | |
1663 | bit <<= 1; | |
1664 | } | |
1665 | ||
13b84ec7 | 1666 | return 0; |
4ad49000 LP |
1667 | } |
1668 | ||
7b3fd631 | 1669 | int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { |
6c12b52e LP |
1670 | Iterator i; |
1671 | void *pidp; | |
1672 | int r = 0; | |
1673 | ||
1674 | SET_FOREACH(pidp, pids, i) { | |
1675 | pid_t pid = PTR_TO_LONG(pidp); | |
13b84ec7 | 1676 | int q; |
6c12b52e | 1677 | |
7b3fd631 | 1678 | q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); |
13b84ec7 LP |
1679 | if (q < 0) |
1680 | r = q; | |
6c12b52e LP |
1681 | } |
1682 | ||
1683 | return r; | |
1684 | } | |
1685 | ||
03b90d4b | 1686 | int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
4ad49000 LP |
1687 | CGroupControllerMask bit = 1; |
1688 | const char *n; | |
1689 | int r; | |
1690 | ||
13b84ec7 LP |
1691 | if (!path_equal(from, to)) { |
1692 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true); | |
1693 | if (r < 0) | |
1694 | return r; | |
1695 | } | |
4ad49000 LP |
1696 | |
1697 | NULSTR_FOREACH(n, mask_names) { | |
03b90d4b LP |
1698 | if (supported & bit) { |
1699 | const char *p = NULL; | |
1700 | ||
1701 | if (to_callback) | |
1702 | p = to_callback(bit, userdata); | |
1703 | ||
1704 | if (!p) | |
1705 | p = to; | |
1706 | ||
1707 | cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false); | |
1708 | } | |
4ad49000 LP |
1709 | |
1710 | bit <<= 1; | |
1711 | } | |
1712 | ||
13b84ec7 | 1713 | return 0; |
4ad49000 LP |
1714 | } |
1715 | ||
13b84ec7 | 1716 | int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) { |
4ad49000 LP |
1717 | CGroupControllerMask bit = 1; |
1718 | const char *n; | |
1719 | int r; | |
1720 | ||
1721 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
1722 | if (r < 0) | |
1723 | return r; | |
1724 | ||
1725 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 | 1726 | if (supported & bit) |
4ad49000 LP |
1727 | cg_trim(n, path, delete_root); |
1728 | ||
1729 | bit <<= 1; | |
1730 | } | |
1731 | ||
13b84ec7 | 1732 | return 0; |
4ad49000 LP |
1733 | } |
1734 | ||
1735 | CGroupControllerMask cg_mask_supported(void) { | |
1736 | CGroupControllerMask bit = 1, mask = 0; | |
1737 | const char *n; | |
1738 | ||
1739 | NULSTR_FOREACH(n, mask_names) { | |
1740 | if (check_hierarchy(n) >= 0) | |
1741 | mask |= bit; | |
1742 | ||
1743 | bit <<= 1; | |
1744 | } | |
1745 | ||
1746 | return mask; | |
1747 | } | |
b12afc8c LP |
1748 | |
1749 | int cg_kernel_controllers(Set *controllers) { | |
1750 | _cleanup_fclose_ FILE *f = NULL; | |
1751 | char buf[LINE_MAX]; | |
1752 | int r; | |
1753 | ||
1754 | assert(controllers); | |
1755 | ||
1756 | f = fopen("/proc/cgroups", "re"); | |
1757 | if (!f) { | |
1758 | if (errno == ENOENT) | |
1759 | return 0; | |
1760 | return -errno; | |
1761 | } | |
1762 | ||
1763 | /* Ignore the header line */ | |
1764 | (void) fgets(buf, sizeof(buf), f); | |
1765 | ||
1766 | for (;;) { | |
1767 | char *controller; | |
1768 | int enabled = 0; | |
1769 | ||
1770 | errno = 0; | |
1771 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { | |
1772 | ||
1773 | if (feof(f)) | |
1774 | break; | |
1775 | ||
1776 | if (ferror(f) && errno) | |
1777 | return -errno; | |
1778 | ||
1779 | return -EBADMSG; | |
1780 | } | |
1781 | ||
1782 | if (!enabled) { | |
1783 | free(controller); | |
1784 | continue; | |
1785 | } | |
1786 | ||
1787 | if (!filename_is_valid(controller)) { | |
1788 | free(controller); | |
1789 | return -EBADMSG; | |
1790 | } | |
1791 | ||
1792 | r = set_consume(controllers, controller); | |
1793 | if (r < 0) | |
1794 | return r; | |
1795 | } | |
1796 | ||
1797 | return 0; | |
1798 | } |