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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" | |
8c6db833 LP |
33 | #include "set.h" |
34 | #include "macro.h" | |
35 | #include "util.h" | |
6482f626 | 36 | #include "formats-util.h" |
0b452006 | 37 | #include "process-util.h" |
9eb977db | 38 | #include "path-util.h" |
ef1673d1 | 39 | #include "unit-name.h" |
a5c32cff | 40 | #include "fileio.h" |
9444b1f2 | 41 | #include "special.h" |
1434ae6f | 42 | #include "mkdir.h" |
a095315b | 43 | #include "login-util.h" |
8c6db833 | 44 | |
c6c18be3 | 45 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
7027ff61 | 46 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 47 | FILE *f; |
7027ff61 | 48 | int r; |
c6c18be3 | 49 | |
c6c18be3 LP |
50 | assert(_f); |
51 | ||
c3175a7f LP |
52 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
53 | if (r < 0) | |
c6c18be3 LP |
54 | return r; |
55 | ||
56 | f = fopen(fs, "re"); | |
c6c18be3 LP |
57 | if (!f) |
58 | return -errno; | |
59 | ||
60 | *_f = f; | |
61 | return 0; | |
62 | } | |
63 | ||
c6c18be3 LP |
64 | int cg_read_pid(FILE *f, pid_t *_pid) { |
65 | unsigned long ul; | |
66 | ||
67 | /* Note that the cgroup.procs might contain duplicates! See | |
68 | * cgroups.txt for details. */ | |
69 | ||
7027ff61 LP |
70 | assert(f); |
71 | assert(_pid); | |
72 | ||
c6c18be3 LP |
73 | errno = 0; |
74 | if (fscanf(f, "%lu", &ul) != 1) { | |
75 | ||
76 | if (feof(f)) | |
77 | return 0; | |
78 | ||
79 | return errno ? -errno : -EIO; | |
80 | } | |
81 | ||
82 | if (ul <= 0) | |
83 | return -EIO; | |
84 | ||
85 | *_pid = (pid_t) ul; | |
86 | return 1; | |
87 | } | |
88 | ||
35d2e7ec | 89 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
7027ff61 | 90 | _cleanup_free_ char *fs = NULL; |
35d2e7ec LP |
91 | int r; |
92 | DIR *d; | |
93 | ||
35d2e7ec LP |
94 | assert(_d); |
95 | ||
96 | /* This is not recursive! */ | |
97 | ||
c3175a7f LP |
98 | r = cg_get_path(controller, path, NULL, &fs); |
99 | if (r < 0) | |
35d2e7ec LP |
100 | return r; |
101 | ||
102 | d = opendir(fs); | |
35d2e7ec LP |
103 | if (!d) |
104 | return -errno; | |
105 | ||
106 | *_d = d; | |
107 | return 0; | |
108 | } | |
109 | ||
110 | int cg_read_subgroup(DIR *d, char **fn) { | |
111 | struct dirent *de; | |
112 | ||
113 | assert(d); | |
7027ff61 | 114 | assert(fn); |
35d2e7ec | 115 | |
7027ff61 | 116 | FOREACH_DIRENT(de, d, return -errno) { |
35d2e7ec LP |
117 | char *b; |
118 | ||
119 | if (de->d_type != DT_DIR) | |
120 | continue; | |
121 | ||
122 | if (streq(de->d_name, ".") || | |
123 | streq(de->d_name, "..")) | |
124 | continue; | |
125 | ||
7027ff61 LP |
126 | b = strdup(de->d_name); |
127 | if (!b) | |
35d2e7ec LP |
128 | return -ENOMEM; |
129 | ||
130 | *fn = b; | |
131 | return 1; | |
132 | } | |
133 | ||
35d2e7ec LP |
134 | return 0; |
135 | } | |
136 | ||
4ad49000 | 137 | int cg_rmdir(const char *controller, const char *path) { |
7027ff61 | 138 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
139 | int r; |
140 | ||
ad293f5a LP |
141 | r = cg_get_path(controller, path, NULL, &p); |
142 | if (r < 0) | |
35d2e7ec LP |
143 | return r; |
144 | ||
145 | r = rmdir(p); | |
7027ff61 LP |
146 | if (r < 0 && errno != ENOENT) |
147 | return -errno; | |
35d2e7ec | 148 | |
7027ff61 | 149 | return 0; |
35d2e7ec LP |
150 | } |
151 | ||
430c18ed | 152 | int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { |
7027ff61 | 153 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 154 | bool done = false; |
8c6db833 | 155 | int r, ret = 0; |
35d2e7ec | 156 | pid_t my_pid; |
8c6db833 | 157 | |
8c6db833 LP |
158 | assert(sig >= 0); |
159 | ||
160 | /* This goes through the tasks list and kills them all. This | |
161 | * is repeated until no further processes are added to the | |
162 | * tasks list, to properly handle forking processes */ | |
163 | ||
7027ff61 | 164 | if (!s) { |
d5099efc | 165 | s = allocated_set = set_new(NULL); |
7027ff61 | 166 | if (!s) |
ca949c9d | 167 | return -ENOMEM; |
7027ff61 | 168 | } |
8c6db833 LP |
169 | |
170 | my_pid = getpid(); | |
171 | ||
172 | do { | |
7027ff61 | 173 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 174 | pid_t pid = 0; |
8c6db833 LP |
175 | done = true; |
176 | ||
7027ff61 LP |
177 | r = cg_enumerate_processes(controller, path, &f); |
178 | if (r < 0) { | |
4c633005 | 179 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 180 | return r; |
35d2e7ec | 181 | |
7027ff61 | 182 | return ret; |
35d2e7ec | 183 | } |
c6c18be3 LP |
184 | |
185 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 186 | |
7027ff61 | 187 | if (ignore_self && pid == my_pid) |
c6c18be3 | 188 | continue; |
8c6db833 | 189 | |
c6c18be3 LP |
190 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
191 | continue; | |
8c6db833 LP |
192 | |
193 | /* If we haven't killed this process yet, kill | |
194 | * it */ | |
4c633005 LP |
195 | if (kill(pid, sig) < 0) { |
196 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 197 | ret = -errno; |
6e8314c4 | 198 | } else { |
dc8962da | 199 | if (sigcont && sig != SIGKILL) |
430c18ed LP |
200 | kill(pid, SIGCONT); |
201 | ||
6e8314c4 LP |
202 | if (ret == 0) |
203 | ret = 1; | |
430c18ed | 204 | } |
8c6db833 | 205 | |
8c6db833 LP |
206 | done = false; |
207 | ||
7027ff61 LP |
208 | r = set_put(s, LONG_TO_PTR(pid)); |
209 | if (r < 0) { | |
35d2e7ec | 210 | if (ret >= 0) |
7027ff61 | 211 | return r; |
35d2e7ec | 212 | |
7027ff61 | 213 | return ret; |
35d2e7ec LP |
214 | } |
215 | } | |
216 | ||
217 | if (r < 0) { | |
218 | if (ret >= 0) | |
7027ff61 | 219 | return r; |
35d2e7ec | 220 | |
7027ff61 | 221 | return ret; |
8c6db833 LP |
222 | } |
223 | ||
8c6db833 LP |
224 | /* To avoid racing against processes which fork |
225 | * quicker than we can kill them we repeat this until | |
226 | * no new pids need to be killed. */ | |
227 | ||
35d2e7ec | 228 | } while (!done); |
8c6db833 | 229 | |
35d2e7ec | 230 | return ret; |
8c6db833 LP |
231 | } |
232 | ||
430c18ed | 233 | int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { |
7027ff61 LP |
234 | _cleanup_set_free_ Set *allocated_set = NULL; |
235 | _cleanup_closedir_ DIR *d = NULL; | |
35d2e7ec | 236 | int r, ret = 0; |
35d2e7ec | 237 | char *fn; |
8c6db833 LP |
238 | |
239 | assert(path); | |
8c6db833 LP |
240 | assert(sig >= 0); |
241 | ||
7027ff61 | 242 | if (!s) { |
d5099efc | 243 | s = allocated_set = set_new(NULL); |
7027ff61 | 244 | if (!s) |
ca949c9d | 245 | return -ENOMEM; |
7027ff61 | 246 | } |
ca949c9d | 247 | |
430c18ed | 248 | ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); |
8c6db833 | 249 | |
7027ff61 LP |
250 | r = cg_enumerate_subgroups(controller, path, &d); |
251 | if (r < 0) { | |
4c633005 | 252 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 253 | return r; |
8c6db833 | 254 | |
7027ff61 | 255 | return ret; |
35d2e7ec | 256 | } |
8c6db833 | 257 | |
35d2e7ec | 258 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 259 | _cleanup_free_ char *p = NULL; |
8c6db833 | 260 | |
7027ff61 | 261 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 262 | free(fn); |
7027ff61 LP |
263 | if (!p) |
264 | return -ENOMEM; | |
8c6db833 | 265 | |
430c18ed | 266 | r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); |
7027ff61 | 267 | if (ret >= 0 && r != 0) |
35d2e7ec | 268 | ret = r; |
8c6db833 LP |
269 | } |
270 | ||
7027ff61 | 271 | if (ret >= 0 && r < 0) |
35d2e7ec LP |
272 | ret = r; |
273 | ||
7027ff61 | 274 | if (rem) { |
4ad49000 | 275 | r = cg_rmdir(controller, path); |
7027ff61 LP |
276 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
277 | return r; | |
278 | } | |
ca949c9d | 279 | |
8c6db833 LP |
280 | return ret; |
281 | } | |
282 | ||
246aa6dd | 283 | int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) { |
35d2e7ec | 284 | bool done = false; |
246aa6dd | 285 | _cleanup_set_free_ Set *s = NULL; |
8c6db833 LP |
286 | int r, ret = 0; |
287 | pid_t my_pid; | |
288 | ||
246aa6dd LP |
289 | assert(cfrom); |
290 | assert(pfrom); | |
291 | assert(cto); | |
292 | assert(pto); | |
8c6db833 | 293 | |
d5099efc | 294 | s = set_new(NULL); |
246aa6dd | 295 | if (!s) |
35d2e7ec LP |
296 | return -ENOMEM; |
297 | ||
8c6db833 LP |
298 | my_pid = getpid(); |
299 | ||
300 | do { | |
7027ff61 | 301 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 302 | pid_t pid = 0; |
8c6db833 LP |
303 | done = true; |
304 | ||
b043cd0b | 305 | r = cg_enumerate_processes(cfrom, pfrom, &f); |
246aa6dd | 306 | if (r < 0) { |
4c633005 | 307 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 308 | return r; |
35d2e7ec | 309 | |
246aa6dd | 310 | return ret; |
35d2e7ec | 311 | } |
c6c18be3 LP |
312 | |
313 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 314 | |
35d2e7ec LP |
315 | /* This might do weird stuff if we aren't a |
316 | * single-threaded program. However, we | |
317 | * luckily know we are not */ | |
7027ff61 | 318 | if (ignore_self && pid == my_pid) |
c6c18be3 | 319 | continue; |
8c6db833 | 320 | |
35d2e7ec LP |
321 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
322 | continue; | |
323 | ||
9b84c7f9 LP |
324 | /* Ignore kernel threads. Since they can only |
325 | * exist in the root cgroup, we only check for | |
326 | * them there. */ | |
327 | if (cfrom && | |
328 | (isempty(pfrom) || path_equal(pfrom, "/")) && | |
329 | is_kernel_thread(pid) > 0) | |
330 | continue; | |
331 | ||
246aa6dd LP |
332 | r = cg_attach(cto, pto, pid); |
333 | if (r < 0) { | |
4c633005 | 334 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
335 | ret = r; |
336 | } else if (ret == 0) | |
337 | ret = 1; | |
8c6db833 | 338 | |
8c6db833 | 339 | done = false; |
35d2e7ec | 340 | |
246aa6dd LP |
341 | r = set_put(s, LONG_TO_PTR(pid)); |
342 | if (r < 0) { | |
35d2e7ec | 343 | if (ret >= 0) |
7027ff61 | 344 | return r; |
35d2e7ec | 345 | |
246aa6dd | 346 | return ret; |
35d2e7ec LP |
347 | } |
348 | } | |
349 | ||
350 | if (r < 0) { | |
351 | if (ret >= 0) | |
7027ff61 | 352 | return r; |
35d2e7ec | 353 | |
246aa6dd | 354 | return ret; |
8c6db833 | 355 | } |
35d2e7ec | 356 | } while (!done); |
8c6db833 | 357 | |
35d2e7ec | 358 | return ret; |
8c6db833 LP |
359 | } |
360 | ||
4ad49000 LP |
361 | int cg_migrate_recursive( |
362 | const char *cfrom, | |
363 | const char *pfrom, | |
364 | const char *cto, | |
365 | const char *pto, | |
366 | bool ignore_self, | |
367 | bool rem) { | |
368 | ||
246aa6dd | 369 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 370 | int r, ret = 0; |
35d2e7ec | 371 | char *fn; |
8c6db833 | 372 | |
246aa6dd LP |
373 | assert(cfrom); |
374 | assert(pfrom); | |
375 | assert(cto); | |
376 | assert(pto); | |
8c6db833 | 377 | |
246aa6dd | 378 | ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self); |
8c6db833 | 379 | |
246aa6dd LP |
380 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
381 | if (r < 0) { | |
4c633005 | 382 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
383 | return r; |
384 | ||
246aa6dd | 385 | return ret; |
35d2e7ec LP |
386 | } |
387 | ||
388 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 389 | _cleanup_free_ char *p = NULL; |
8c6db833 | 390 | |
246aa6dd | 391 | p = strjoin(pfrom, "/", fn, NULL); |
35d2e7ec | 392 | free(fn); |
246aa6dd | 393 | if (!p) { |
35d2e7ec | 394 | if (ret >= 0) |
7027ff61 | 395 | return -ENOMEM; |
35d2e7ec | 396 | |
246aa6dd | 397 | return ret; |
8c6db833 LP |
398 | } |
399 | ||
246aa6dd | 400 | r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem); |
35d2e7ec LP |
401 | if (r != 0 && ret >= 0) |
402 | ret = r; | |
8c6db833 LP |
403 | } |
404 | ||
35d2e7ec LP |
405 | if (r < 0 && ret >= 0) |
406 | ret = r; | |
407 | ||
246aa6dd | 408 | if (rem) { |
4ad49000 | 409 | r = cg_rmdir(cfrom, pfrom); |
246aa6dd LP |
410 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
411 | return r; | |
412 | } | |
8c6db833 LP |
413 | |
414 | return ret; | |
415 | } | |
416 | ||
13b84ec7 LP |
417 | int cg_migrate_recursive_fallback( |
418 | const char *cfrom, | |
419 | const char *pfrom, | |
420 | const char *cto, | |
421 | const char *pto, | |
422 | bool ignore_self, | |
423 | bool rem) { | |
424 | ||
425 | int r; | |
426 | ||
427 | assert(cfrom); | |
428 | assert(pfrom); | |
429 | assert(cto); | |
430 | assert(pto); | |
431 | ||
432 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem); | |
433 | if (r < 0) { | |
434 | char prefix[strlen(pto) + 1]; | |
435 | ||
436 | /* This didn't work? Then let's try all prefixes of the destination */ | |
437 | ||
fecffe5d | 438 | PATH_FOREACH_PREFIX(prefix, pto) { |
13b84ec7 LP |
439 | r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem); |
440 | if (r >= 0) | |
441 | break; | |
442 | } | |
443 | } | |
444 | ||
fecffe5d | 445 | return 0; |
13b84ec7 LP |
446 | } |
447 | ||
3474ae3c LP |
448 | static const char *normalize_controller(const char *controller) { |
449 | ||
7027ff61 LP |
450 | assert(controller); |
451 | ||
185a0874 | 452 | if (startswith(controller, "name=")) |
3474ae3c LP |
453 | return controller + 5; |
454 | else | |
455 | return controller; | |
456 | } | |
457 | ||
458 | static int join_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
018ef268 | 459 | char *t = NULL; |
3474ae3c | 460 | |
9444b1f2 LP |
461 | if (!isempty(controller)) { |
462 | if (!isempty(path) && !isempty(suffix)) | |
b7def684 | 463 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL); |
9444b1f2 | 464 | else if (!isempty(path)) |
b7def684 | 465 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL); |
9444b1f2 | 466 | else if (!isempty(suffix)) |
b7def684 | 467 | t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL); |
c3175a7f | 468 | else |
7027ff61 | 469 | t = strappend("/sys/fs/cgroup/", controller); |
c3175a7f | 470 | } else { |
9444b1f2 | 471 | if (!isempty(path) && !isempty(suffix)) |
b7def684 | 472 | t = strjoin(path, "/", suffix, NULL); |
9444b1f2 | 473 | else if (!isempty(path)) |
c3175a7f | 474 | t = strdup(path); |
7027ff61 LP |
475 | else |
476 | return -EINVAL; | |
c3175a7f | 477 | } |
3474ae3c LP |
478 | |
479 | if (!t) | |
480 | return -ENOMEM; | |
481 | ||
dbb9401d | 482 | *fs = path_kill_slashes(t); |
3474ae3c LP |
483 | return 0; |
484 | } | |
485 | ||
8c6db833 | 486 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
dbd821ac | 487 | const char *p; |
ec202eae | 488 | static thread_local bool good = false; |
8c6db833 | 489 | |
dbd821ac LP |
490 | assert(fs); |
491 | ||
185a0874 | 492 | if (controller && !cg_controller_is_valid(controller)) |
78edb35a LP |
493 | return -EINVAL; |
494 | ||
3bfc7184 | 495 | if (_unlikely_(!good)) { |
70132bd0 LP |
496 | int r; |
497 | ||
e26d6ce5 | 498 | r = path_is_mount_point("/sys/fs/cgroup", 0); |
da00518b LP |
499 | if (r < 0) |
500 | return r; | |
501 | if (r == 0) | |
502 | return -ENOENT; | |
70132bd0 LP |
503 | |
504 | /* Cache this to save a few stat()s */ | |
505 | good = true; | |
506 | } | |
507 | ||
c3175a7f | 508 | p = controller ? normalize_controller(controller) : NULL; |
7027ff61 | 509 | |
3474ae3c LP |
510 | return join_path(p, path, suffix, fs); |
511 | } | |
dbd821ac | 512 | |
7027ff61 | 513 | static int check_hierarchy(const char *p) { |
b12afc8c | 514 | const char *cc; |
37099707 LP |
515 | |
516 | assert(p); | |
517 | ||
b12afc8c LP |
518 | if (!filename_is_valid(p)) |
519 | return 0; | |
520 | ||
37099707 | 521 | /* Check if this controller actually really exists */ |
63c372cb | 522 | cc = strjoina("/sys/fs/cgroup/", p); |
b12afc8c | 523 | if (laccess(cc, F_OK) < 0) |
37099707 LP |
524 | return -errno; |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
3474ae3c LP |
529 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
530 | const char *p; | |
37099707 | 531 | int r; |
dbd821ac | 532 | |
3474ae3c | 533 | assert(fs); |
70132bd0 | 534 | |
185a0874 | 535 | if (!cg_controller_is_valid(controller)) |
3474ae3c | 536 | return -EINVAL; |
70132bd0 | 537 | |
37099707 | 538 | /* Normalize the controller syntax */ |
3474ae3c | 539 | p = normalize_controller(controller); |
8c6db833 | 540 | |
3474ae3c | 541 | /* Check if this controller actually really exists */ |
7027ff61 | 542 | r = check_hierarchy(p); |
37099707 LP |
543 | if (r < 0) |
544 | return r; | |
3474ae3c LP |
545 | |
546 | return join_path(p, path, suffix, fs); | |
8c6db833 LP |
547 | } |
548 | ||
e27796a0 | 549 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
4ad49000 LP |
550 | assert(path); |
551 | assert(sb); | |
552 | assert(ftwbuf); | |
e27796a0 LP |
553 | |
554 | if (typeflag != FTW_DP) | |
555 | return 0; | |
556 | ||
557 | if (ftwbuf->level < 1) | |
558 | return 0; | |
559 | ||
e27796a0 LP |
560 | rmdir(path); |
561 | return 0; | |
562 | } | |
563 | ||
8c6db833 | 564 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 565 | _cleanup_free_ char *fs = NULL; |
e27796a0 | 566 | int r = 0; |
8c6db833 | 567 | |
8c6db833 LP |
568 | assert(path); |
569 | ||
e27796a0 LP |
570 | r = cg_get_path(controller, path, NULL, &fs); |
571 | if (r < 0) | |
8c6db833 LP |
572 | return r; |
573 | ||
e27796a0 | 574 | errno = 0; |
7027ff61 | 575 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) |
e27796a0 LP |
576 | r = errno ? -errno : -EIO; |
577 | ||
578 | if (delete_root) { | |
4ad49000 LP |
579 | if (rmdir(fs) < 0 && errno != ENOENT) |
580 | return -errno; | |
e27796a0 LP |
581 | } |
582 | ||
e27796a0 | 583 | return r; |
8c6db833 LP |
584 | } |
585 | ||
586 | int cg_delete(const char *controller, const char *path) { | |
7027ff61 | 587 | _cleanup_free_ char *parent = NULL; |
8c6db833 LP |
588 | int r; |
589 | ||
8c6db833 LP |
590 | assert(path); |
591 | ||
7027ff61 LP |
592 | r = path_get_parent(path, &parent); |
593 | if (r < 0) | |
35d2e7ec | 594 | return r; |
8c6db833 | 595 | |
246aa6dd | 596 | r = cg_migrate_recursive(controller, path, controller, parent, false, true); |
4c633005 | 597 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
598 | } |
599 | ||
1434ae6f LP |
600 | int cg_create(const char *controller, const char *path) { |
601 | _cleanup_free_ char *fs = NULL; | |
602 | int r; | |
603 | ||
604 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
605 | if (r < 0) | |
606 | return r; | |
607 | ||
608 | r = mkdir_parents(fs, 0755); | |
609 | if (r < 0) | |
610 | return r; | |
611 | ||
612 | if (mkdir(fs, 0755) < 0) { | |
613 | ||
614 | if (errno == EEXIST) | |
615 | return 0; | |
616 | ||
617 | return -errno; | |
618 | } | |
619 | ||
620 | return 1; | |
621 | } | |
622 | ||
623 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
624 | int r, q; | |
625 | ||
626 | assert(pid >= 0); | |
627 | ||
628 | r = cg_create(controller, path); | |
629 | if (r < 0) | |
630 | return r; | |
631 | ||
632 | q = cg_attach(controller, path, pid); | |
633 | if (q < 0) | |
634 | return q; | |
635 | ||
636 | /* This does not remove the cgroup on failure */ | |
637 | return r; | |
638 | } | |
639 | ||
8c6db833 | 640 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
641 | _cleanup_free_ char *fs = NULL; |
642 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
643 | int r; |
644 | ||
8c6db833 LP |
645 | assert(path); |
646 | assert(pid >= 0); | |
647 | ||
b043cd0b | 648 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
3474ae3c | 649 | if (r < 0) |
c6c18be3 | 650 | return r; |
8c6db833 LP |
651 | |
652 | if (pid == 0) | |
653 | pid = getpid(); | |
654 | ||
de0671ee | 655 | snprintf(c, sizeof(c), PID_FMT"\n", pid); |
8c6db833 | 656 | |
4c1fc3e4 | 657 | return write_string_file(fs, c, 0); |
8c6db833 LP |
658 | } |
659 | ||
13b84ec7 LP |
660 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
661 | int r; | |
662 | ||
663 | assert(controller); | |
664 | assert(path); | |
665 | assert(pid >= 0); | |
666 | ||
667 | r = cg_attach(controller, path, pid); | |
668 | if (r < 0) { | |
669 | char prefix[strlen(path) + 1]; | |
670 | ||
671 | /* This didn't work? Then let's try all prefixes of | |
672 | * the destination */ | |
673 | ||
fecffe5d | 674 | PATH_FOREACH_PREFIX(prefix, path) { |
13b84ec7 LP |
675 | r = cg_attach(controller, prefix, pid); |
676 | if (r >= 0) | |
677 | break; | |
678 | } | |
679 | } | |
680 | ||
fecffe5d | 681 | return 0; |
13b84ec7 LP |
682 | } |
683 | ||
2d76d14e LP |
684 | int cg_set_group_access( |
685 | const char *controller, | |
686 | const char *path, | |
687 | mode_t mode, | |
688 | uid_t uid, | |
689 | gid_t gid) { | |
690 | ||
574d5f2d | 691 | _cleanup_free_ char *fs = NULL; |
8c6db833 LP |
692 | int r; |
693 | ||
8c6db833 LP |
694 | assert(path); |
695 | ||
fed1e721 | 696 | if (mode != MODE_INVALID) |
8d53b453 LP |
697 | mode &= 0777; |
698 | ||
699 | r = cg_get_path(controller, path, NULL, &fs); | |
700 | if (r < 0) | |
8c6db833 LP |
701 | return r; |
702 | ||
574d5f2d | 703 | return chmod_and_chown(fs, mode, uid, gid); |
8c6db833 LP |
704 | } |
705 | ||
974efc46 LP |
706 | int cg_set_task_access( |
707 | const char *controller, | |
708 | const char *path, | |
709 | mode_t mode, | |
710 | uid_t uid, | |
4ad49000 | 711 | gid_t gid) { |
974efc46 LP |
712 | |
713 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
8c6db833 LP |
714 | int r; |
715 | ||
8c6db833 LP |
716 | assert(path); |
717 | ||
fed1e721 | 718 | if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
8d53b453 LP |
719 | return 0; |
720 | ||
fed1e721 | 721 | if (mode != MODE_INVALID) |
8d53b453 LP |
722 | mode &= 0666; |
723 | ||
b043cd0b | 724 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
8d53b453 | 725 | if (r < 0) |
8c6db833 LP |
726 | return r; |
727 | ||
728 | r = chmod_and_chown(fs, mode, uid, gid); | |
974efc46 LP |
729 | if (r < 0) |
730 | return r; | |
8c6db833 | 731 | |
b043cd0b LP |
732 | /* Compatibility, Always keep values for "tasks" in sync with |
733 | * "cgroup.procs" */ | |
734 | r = cg_get_path(controller, path, "tasks", &procs); | |
974efc46 LP |
735 | if (r < 0) |
736 | return r; | |
737 | ||
738 | return chmod_and_chown(procs, mode, uid, gid); | |
8c6db833 LP |
739 | } |
740 | ||
7027ff61 | 741 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
7027ff61 LP |
742 | _cleanup_fclose_ FILE *f = NULL; |
743 | char line[LINE_MAX]; | |
8af8afd6 | 744 | const char *fs; |
c6c18be3 | 745 | size_t cs; |
8c6db833 | 746 | |
8c6db833 | 747 | assert(path); |
c6c18be3 | 748 | assert(pid >= 0); |
8c6db833 | 749 | |
8af8afd6 | 750 | if (controller) { |
185a0874 | 751 | if (!cg_controller_is_valid(controller)) |
8af8afd6 | 752 | return -EINVAL; |
78edb35a | 753 | |
8af8afd6 LP |
754 | controller = normalize_controller(controller); |
755 | } else | |
7027ff61 LP |
756 | controller = SYSTEMD_CGROUP_CONTROLLER; |
757 | ||
b68fa010 | 758 | fs = procfs_file_alloca(pid, "cgroup"); |
8c6db833 | 759 | |
c6c18be3 | 760 | f = fopen(fs, "re"); |
4c633005 LP |
761 | if (!f) |
762 | return errno == ENOENT ? -ESRCH : -errno; | |
763 | ||
c6c18be3 LP |
764 | cs = strlen(controller); |
765 | ||
7027ff61 | 766 | FOREACH_LINE(line, f, return -errno) { |
a2a5291b | 767 | char *l, *p, *e; |
8af8afd6 | 768 | size_t k; |
a2a5291b | 769 | const char *word, *state; |
8af8afd6 | 770 | bool found = false; |
c6c18be3 LP |
771 | |
772 | truncate_nl(line); | |
773 | ||
7027ff61 LP |
774 | l = strchr(line, ':'); |
775 | if (!l) | |
c6c18be3 LP |
776 | continue; |
777 | ||
778 | l++; | |
8af8afd6 LP |
779 | e = strchr(l, ':'); |
780 | if (!e) | |
c6c18be3 LP |
781 | continue; |
782 | ||
8af8afd6 LP |
783 | *e = 0; |
784 | ||
a2a5291b | 785 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { |
8af8afd6 | 786 | |
a2a5291b | 787 | if (k == cs && memcmp(word, controller, cs) == 0) { |
8af8afd6 LP |
788 | found = true; |
789 | break; | |
790 | } | |
791 | ||
792 | if (k == 5 + cs && | |
a2a5291b ZJS |
793 | memcmp(word, "name=", 5) == 0 && |
794 | memcmp(word+5, controller, cs) == 0) { | |
8af8afd6 LP |
795 | found = true; |
796 | break; | |
797 | } | |
798 | } | |
799 | ||
800 | if (!found) | |
c6c18be3 LP |
801 | continue; |
802 | ||
8af8afd6 | 803 | p = strdup(e + 1); |
7027ff61 LP |
804 | if (!p) |
805 | return -ENOMEM; | |
c6c18be3 LP |
806 | |
807 | *path = p; | |
7027ff61 | 808 | return 0; |
c6c18be3 LP |
809 | } |
810 | ||
7027ff61 | 811 | return -ENOENT; |
8c6db833 LP |
812 | } |
813 | ||
814 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 LP |
815 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
816 | char *sc; | |
8c6db833 LP |
817 | int r; |
818 | ||
8c6db833 LP |
819 | assert(agent); |
820 | ||
7027ff61 LP |
821 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
822 | if (r < 0) | |
c6c18be3 | 823 | return r; |
8c6db833 | 824 | |
7027ff61 LP |
825 | r = read_one_line_file(fs, &contents); |
826 | if (r < 0) | |
827 | return r; | |
8c6db833 LP |
828 | |
829 | sc = strstrip(contents); | |
8c6db833 | 830 | if (sc[0] == 0) { |
4c1fc3e4 | 831 | r = write_string_file(fs, agent, 0); |
574d5f2d | 832 | if (r < 0) |
7027ff61 LP |
833 | return r; |
834 | } else if (!streq(sc, agent)) | |
835 | return -EEXIST; | |
8c6db833 | 836 | |
0da16248 | 837 | fs = mfree(fs); |
7027ff61 LP |
838 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
839 | if (r < 0) | |
840 | return r; | |
8c6db833 | 841 | |
0da16248 | 842 | contents = mfree(contents); |
7027ff61 LP |
843 | r = read_one_line_file(fs, &contents); |
844 | if (r < 0) | |
845 | return r; | |
8c6db833 LP |
846 | |
847 | sc = strstrip(contents); | |
8c6db833 | 848 | if (streq(sc, "0")) { |
4c1fc3e4 | 849 | r = write_string_file(fs, "1", 0); |
7027ff61 LP |
850 | if (r < 0) |
851 | return r; | |
c6c18be3 | 852 | |
7027ff61 LP |
853 | return 1; |
854 | } | |
8c6db833 | 855 | |
7027ff61 LP |
856 | if (!streq(sc, "1")) |
857 | return -EIO; | |
8c6db833 | 858 | |
7027ff61 | 859 | return 0; |
8c6db833 LP |
860 | } |
861 | ||
ad929bcc KS |
862 | int cg_uninstall_release_agent(const char *controller) { |
863 | _cleanup_free_ char *fs = NULL; | |
864 | int r; | |
865 | ||
ac9ef333 LP |
866 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
867 | if (r < 0) | |
868 | return r; | |
869 | ||
4c1fc3e4 | 870 | r = write_string_file(fs, "0", 0); |
ac9ef333 LP |
871 | if (r < 0) |
872 | return r; | |
873 | ||
0da16248 | 874 | fs = mfree(fs); |
ac9ef333 | 875 | |
ad929bcc KS |
876 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
877 | if (r < 0) | |
878 | return r; | |
879 | ||
4c1fc3e4 | 880 | r = write_string_file(fs, "", 0); |
ad929bcc KS |
881 | if (r < 0) |
882 | return r; | |
883 | ||
ac9ef333 | 884 | return 0; |
ad929bcc KS |
885 | } |
886 | ||
8c6db833 | 887 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { |
7027ff61 | 888 | _cleanup_fclose_ FILE *f = NULL; |
c3175a7f | 889 | pid_t pid = 0, self_pid; |
c6c18be3 | 890 | bool found = false; |
7027ff61 | 891 | int r; |
8c6db833 | 892 | |
8c6db833 LP |
893 | assert(path); |
894 | ||
b043cd0b | 895 | r = cg_enumerate_processes(controller, path, &f); |
c3175a7f | 896 | if (r < 0) |
4c633005 | 897 | return r == -ENOENT ? 1 : r; |
8c6db833 | 898 | |
c3175a7f LP |
899 | self_pid = getpid(); |
900 | ||
c6c18be3 | 901 | while ((r = cg_read_pid(f, &pid)) > 0) { |
8c6db833 | 902 | |
c3175a7f | 903 | if (ignore_self && pid == self_pid) |
c6c18be3 | 904 | continue; |
8c6db833 | 905 | |
c6c18be3 LP |
906 | found = true; |
907 | break; | |
8c6db833 LP |
908 | } |
909 | ||
c6c18be3 LP |
910 | if (r < 0) |
911 | return r; | |
8c6db833 | 912 | |
c6c18be3 | 913 | return !found; |
8c6db833 LP |
914 | } |
915 | ||
916 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { | |
7027ff61 | 917 | _cleanup_closedir_ DIR *d = NULL; |
35d2e7ec | 918 | char *fn; |
7027ff61 | 919 | int r; |
8c6db833 | 920 | |
8c6db833 LP |
921 | assert(path); |
922 | ||
c3175a7f LP |
923 | r = cg_is_empty(controller, path, ignore_self); |
924 | if (r <= 0) | |
35d2e7ec LP |
925 | return r; |
926 | ||
c3175a7f LP |
927 | r = cg_enumerate_subgroups(controller, path, &d); |
928 | if (r < 0) | |
4c633005 | 929 | return r == -ENOENT ? 1 : r; |
8c6db833 | 930 | |
35d2e7ec | 931 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 932 | _cleanup_free_ char *p = NULL; |
8c6db833 | 933 | |
7027ff61 | 934 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 935 | free(fn); |
7027ff61 LP |
936 | if (!p) |
937 | return -ENOMEM; | |
8c6db833 | 938 | |
35d2e7ec | 939 | r = cg_is_empty_recursive(controller, p, ignore_self); |
35d2e7ec | 940 | if (r <= 0) |
7027ff61 | 941 | return r; |
35d2e7ec LP |
942 | } |
943 | ||
7027ff61 LP |
944 | if (r < 0) |
945 | return r; | |
35d2e7ec | 946 | |
7027ff61 | 947 | return 1; |
35d2e7ec LP |
948 | } |
949 | ||
950 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
951 | const char *e; | |
952 | char *t = NULL, *u = NULL; | |
5954c074 | 953 | _cleanup_free_ char *v = NULL; |
35d2e7ec LP |
954 | |
955 | assert(spec); | |
35d2e7ec LP |
956 | |
957 | if (*spec == '/') { | |
e884315e LP |
958 | if (!path_is_safe(spec)) |
959 | return -EINVAL; | |
35d2e7ec LP |
960 | |
961 | if (path) { | |
246aa6dd LP |
962 | t = strdup(spec); |
963 | if (!t) | |
35d2e7ec LP |
964 | return -ENOMEM; |
965 | ||
dbb9401d | 966 | *path = path_kill_slashes(t); |
8c6db833 LP |
967 | } |
968 | ||
35d2e7ec LP |
969 | if (controller) |
970 | *controller = NULL; | |
971 | ||
972 | return 0; | |
8c6db833 LP |
973 | } |
974 | ||
246aa6dd LP |
975 | e = strchr(spec, ':'); |
976 | if (!e) { | |
185a0874 | 977 | if (!cg_controller_is_valid(spec)) |
35d2e7ec LP |
978 | return -EINVAL; |
979 | ||
980 | if (controller) { | |
5954c074 | 981 | t = strdup(normalize_controller(spec)); |
246aa6dd | 982 | if (!t) |
35d2e7ec LP |
983 | return -ENOMEM; |
984 | ||
985 | *controller = t; | |
986 | } | |
987 | ||
988 | if (path) | |
989 | *path = NULL; | |
990 | ||
991 | return 0; | |
8c6db833 LP |
992 | } |
993 | ||
5954c074 LP |
994 | v = strndup(spec, e-spec); |
995 | if (!v) | |
996 | return -ENOMEM; | |
997 | t = strdup(normalize_controller(v)); | |
e884315e LP |
998 | if (!t) |
999 | return -ENOMEM; | |
185a0874 | 1000 | if (!cg_controller_is_valid(t)) { |
e884315e | 1001 | free(t); |
35d2e7ec | 1002 | return -EINVAL; |
246aa6dd LP |
1003 | } |
1004 | ||
baa89da4 LP |
1005 | if (streq(e+1, "")) { |
1006 | u = strdup("/"); | |
1007 | if (!u) { | |
1008 | free(t); | |
1009 | return -ENOMEM; | |
1010 | } | |
1011 | } else { | |
1012 | u = strdup(e+1); | |
1013 | if (!u) { | |
1014 | free(t); | |
1015 | return -ENOMEM; | |
1016 | } | |
35d2e7ec | 1017 | |
baa89da4 LP |
1018 | if (!path_is_safe(u) || |
1019 | !path_is_absolute(u)) { | |
1020 | free(t); | |
1021 | free(u); | |
1022 | return -EINVAL; | |
1023 | } | |
1024 | ||
1025 | path_kill_slashes(u); | |
1026 | } | |
5954c074 | 1027 | |
35d2e7ec LP |
1028 | if (controller) |
1029 | *controller = t; | |
e884315e LP |
1030 | else |
1031 | free(t); | |
35d2e7ec LP |
1032 | |
1033 | if (path) | |
1034 | *path = u; | |
e884315e LP |
1035 | else |
1036 | free(u); | |
35d2e7ec LP |
1037 | |
1038 | return 0; | |
8c6db833 | 1039 | } |
c6c18be3 | 1040 | |
7027ff61 | 1041 | int cg_mangle_path(const char *path, char **result) { |
78edb35a LP |
1042 | _cleanup_free_ char *c = NULL, *p = NULL; |
1043 | char *t; | |
35d2e7ec LP |
1044 | int r; |
1045 | ||
1046 | assert(path); | |
1047 | assert(result); | |
1048 | ||
73e231ab | 1049 | /* First, check if it already is a filesystem path */ |
7027ff61 | 1050 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 1051 | |
b69d29ce LP |
1052 | t = strdup(path); |
1053 | if (!t) | |
35d2e7ec LP |
1054 | return -ENOMEM; |
1055 | ||
dbb9401d | 1056 | *result = path_kill_slashes(t); |
35d2e7ec LP |
1057 | return 0; |
1058 | } | |
1059 | ||
73e231ab | 1060 | /* Otherwise, treat it as cg spec */ |
b69d29ce LP |
1061 | r = cg_split_spec(path, &c, &p); |
1062 | if (r < 0) | |
35d2e7ec LP |
1063 | return r; |
1064 | ||
78edb35a | 1065 | return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); |
35d2e7ec | 1066 | } |
1f73f0f1 | 1067 | |
7027ff61 | 1068 | int cg_get_root_path(char **path) { |
9444b1f2 | 1069 | char *p, *e; |
7027ff61 LP |
1070 | int r; |
1071 | ||
1072 | assert(path); | |
1073 | ||
9444b1f2 | 1074 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1075 | if (r < 0) |
1076 | return r; | |
1077 | ||
9444b1f2 LP |
1078 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); |
1079 | if (e) | |
7027ff61 LP |
1080 | *e = 0; |
1081 | ||
1f73f0f1 LP |
1082 | *path = p; |
1083 | return 0; | |
1084 | } | |
b59e2465 | 1085 | |
751bc6ac LP |
1086 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
1087 | _cleanup_free_ char *rt = NULL; | |
1088 | char *p; | |
ba1261bc LP |
1089 | int r; |
1090 | ||
e9174f29 | 1091 | assert(cgroup); |
751bc6ac | 1092 | assert(shifted); |
e9174f29 LP |
1093 | |
1094 | if (!root) { | |
1095 | /* If the root was specified let's use that, otherwise | |
1096 | * let's determine it from PID 1 */ | |
1097 | ||
751bc6ac | 1098 | r = cg_get_root_path(&rt); |
e9174f29 LP |
1099 | if (r < 0) |
1100 | return r; | |
1101 | ||
751bc6ac | 1102 | root = rt; |
e9174f29 | 1103 | } |
ba1261bc | 1104 | |
751bc6ac LP |
1105 | p = path_startswith(cgroup, root); |
1106 | if (p) | |
1107 | *shifted = p - 1; | |
1108 | else | |
1109 | *shifted = cgroup; | |
1110 | ||
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { | |
1115 | _cleanup_free_ char *raw = NULL; | |
1116 | const char *c; | |
1117 | int r; | |
1118 | ||
1119 | assert(pid >= 0); | |
1120 | assert(cgroup); | |
1121 | ||
1122 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
7027ff61 | 1123 | if (r < 0) |
ba1261bc | 1124 | return r; |
ba1261bc | 1125 | |
751bc6ac LP |
1126 | r = cg_shift_path(raw, root, &c); |
1127 | if (r < 0) | |
1128 | return r; | |
ba1261bc | 1129 | |
751bc6ac LP |
1130 | if (c == raw) { |
1131 | *cgroup = raw; | |
1132 | raw = NULL; | |
1133 | } else { | |
1134 | char *n; | |
ba1261bc | 1135 | |
751bc6ac LP |
1136 | n = strdup(c); |
1137 | if (!n) | |
ba1261bc | 1138 | return -ENOMEM; |
ba1261bc | 1139 | |
751bc6ac LP |
1140 | *cgroup = n; |
1141 | } | |
ba1261bc LP |
1142 | |
1143 | return 0; | |
1144 | } | |
1145 | ||
7027ff61 | 1146 | int cg_path_decode_unit(const char *cgroup, char **unit){ |
8b0849e9 LP |
1147 | char *c, *s; |
1148 | size_t n; | |
ef1673d1 MT |
1149 | |
1150 | assert(cgroup); | |
6c03089c | 1151 | assert(unit); |
ef1673d1 | 1152 | |
8b0849e9 LP |
1153 | n = strcspn(cgroup, "/"); |
1154 | if (n < 3) | |
1155 | return -ENXIO; | |
1156 | ||
1157 | c = strndupa(cgroup, n); | |
ae018d9b | 1158 | c = cg_unescape(c); |
ef1673d1 | 1159 | |
7410616c | 1160 | if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) |
cfeaa44a | 1161 | return -ENXIO; |
ef1673d1 | 1162 | |
d7bd3de0 | 1163 | s = strdup(c); |
6c03089c LP |
1164 | if (!s) |
1165 | return -ENOMEM; | |
1166 | ||
1167 | *unit = s; | |
ef1673d1 MT |
1168 | return 0; |
1169 | } | |
1170 | ||
8b0849e9 LP |
1171 | static bool valid_slice_name(const char *p, size_t n) { |
1172 | ||
1173 | if (!p) | |
1174 | return false; | |
1175 | ||
1176 | if (n < strlen("x.slice")) | |
1177 | return false; | |
1178 | ||
1179 | if (memcmp(p + n - 6, ".slice", 6) == 0) { | |
1180 | char buf[n+1], *c; | |
1181 | ||
1182 | memcpy(buf, p, n); | |
1183 | buf[n] = 0; | |
1184 | ||
1185 | c = cg_unescape(buf); | |
1186 | ||
7410616c | 1187 | return unit_name_is_valid(c, UNIT_NAME_PLAIN); |
8b0849e9 LP |
1188 | } |
1189 | ||
1190 | return false; | |
1191 | } | |
1192 | ||
9444b1f2 | 1193 | static const char *skip_slices(const char *p) { |
8b0849e9 LP |
1194 | assert(p); |
1195 | ||
9444b1f2 LP |
1196 | /* Skips over all slice assignments */ |
1197 | ||
1198 | for (;;) { | |
1021b21b LP |
1199 | size_t n; |
1200 | ||
9444b1f2 LP |
1201 | p += strspn(p, "/"); |
1202 | ||
1203 | n = strcspn(p, "/"); | |
8b0849e9 | 1204 | if (!valid_slice_name(p, n)) |
9444b1f2 LP |
1205 | return p; |
1206 | ||
1207 | p += n; | |
1208 | } | |
1209 | } | |
1210 | ||
8b0849e9 | 1211 | int cg_path_get_unit(const char *path, char **ret) { |
6c03089c | 1212 | const char *e; |
8b0849e9 LP |
1213 | char *unit; |
1214 | int r; | |
6c03089c LP |
1215 | |
1216 | assert(path); | |
8b0849e9 | 1217 | assert(ret); |
6c03089c | 1218 | |
9444b1f2 | 1219 | e = skip_slices(path); |
6c03089c | 1220 | |
8b0849e9 LP |
1221 | r = cg_path_decode_unit(e, &unit); |
1222 | if (r < 0) | |
1223 | return r; | |
1224 | ||
1225 | /* We skipped over the slices, don't accept any now */ | |
1226 | if (endswith(unit, ".slice")) { | |
1227 | free(unit); | |
1228 | return -ENXIO; | |
1229 | } | |
1230 | ||
1231 | *ret = unit; | |
1232 | return 0; | |
6c03089c LP |
1233 | } |
1234 | ||
1235 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
7fd1b19b | 1236 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1237 | int r; |
ba1261bc | 1238 | |
ef1673d1 MT |
1239 | assert(unit); |
1240 | ||
7027ff61 | 1241 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1242 | if (r < 0) |
1243 | return r; | |
1244 | ||
6c03089c LP |
1245 | return cg_path_get_unit(cgroup, unit); |
1246 | } | |
ef1673d1 | 1247 | |
d4fffc4b ZJS |
1248 | /** |
1249 | * Skip session-*.scope, but require it to be there. | |
1250 | */ | |
9444b1f2 LP |
1251 | static const char *skip_session(const char *p) { |
1252 | size_t n; | |
1253 | ||
8b0849e9 LP |
1254 | if (isempty(p)) |
1255 | return NULL; | |
9444b1f2 LP |
1256 | |
1257 | p += strspn(p, "/"); | |
1258 | ||
1259 | n = strcspn(p, "/"); | |
8b0849e9 | 1260 | if (n < strlen("session-x.scope")) |
d4fffc4b ZJS |
1261 | return NULL; |
1262 | ||
8b0849e9 LP |
1263 | if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { |
1264 | char buf[n - 8 - 6 + 1]; | |
1265 | ||
1266 | memcpy(buf, p + 8, n - 8 - 6); | |
1267 | buf[n - 8 - 6] = 0; | |
d4fffc4b | 1268 | |
8b0849e9 LP |
1269 | /* Note that session scopes never need unescaping, |
1270 | * since they cannot conflict with the kernel's own | |
1271 | * names, hence we don't need to call cg_unescape() | |
1272 | * here. */ | |
1273 | ||
1274 | if (!session_id_valid(buf)) | |
1275 | return false; | |
1276 | ||
1277 | p += n; | |
1278 | p += strspn(p, "/"); | |
1279 | return p; | |
1280 | } | |
1281 | ||
1282 | return NULL; | |
d4fffc4b ZJS |
1283 | } |
1284 | ||
1285 | /** | |
1286 | * Skip user@*.service, but require it to be there. | |
1287 | */ | |
1288 | static const char *skip_user_manager(const char *p) { | |
1289 | size_t n; | |
1290 | ||
8b0849e9 LP |
1291 | if (isempty(p)) |
1292 | return NULL; | |
d4fffc4b ZJS |
1293 | |
1294 | p += strspn(p, "/"); | |
1295 | ||
1296 | n = strcspn(p, "/"); | |
8b0849e9 | 1297 | if (n < strlen("user@x.service")) |
6c03089c | 1298 | return NULL; |
ef1673d1 | 1299 | |
8b0849e9 LP |
1300 | if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { |
1301 | char buf[n - 5 - 8 + 1]; | |
9444b1f2 | 1302 | |
8b0849e9 LP |
1303 | memcpy(buf, p + 5, n - 5 - 8); |
1304 | buf[n - 5 - 8] = 0; | |
1305 | ||
1306 | /* Note that user manager services never need unescaping, | |
1307 | * since they cannot conflict with the kernel's own | |
1308 | * names, hence we don't need to call cg_unescape() | |
1309 | * here. */ | |
1310 | ||
1311 | if (parse_uid(buf, NULL) < 0) | |
1312 | return NULL; | |
1313 | ||
1314 | p += n; | |
1315 | p += strspn(p, "/"); | |
1316 | ||
1317 | return p; | |
1318 | } | |
1319 | ||
1320 | return NULL; | |
9444b1f2 LP |
1321 | } |
1322 | ||
329ac4bc | 1323 | static const char *skip_user_prefix(const char *path) { |
d4fffc4b | 1324 | const char *e, *t; |
ef1673d1 | 1325 | |
6c03089c | 1326 | assert(path); |
ba1261bc | 1327 | |
9444b1f2 LP |
1328 | /* Skip slices, if there are any */ |
1329 | e = skip_slices(path); | |
ba1261bc | 1330 | |
329ac4bc | 1331 | /* Skip the user manager, if it's in the path now... */ |
8b0849e9 | 1332 | t = skip_user_manager(e); |
329ac4bc LP |
1333 | if (t) |
1334 | return t; | |
8b0849e9 | 1335 | |
329ac4bc LP |
1336 | /* Alternatively skip the user session if it is in the path... */ |
1337 | return skip_session(e); | |
1338 | } | |
32081481 | 1339 | |
329ac4bc LP |
1340 | int cg_path_get_user_unit(const char *path, char **ret) { |
1341 | const char *t; | |
6c03089c | 1342 | |
329ac4bc LP |
1343 | assert(path); |
1344 | assert(ret); | |
8b0849e9 | 1345 | |
329ac4bc LP |
1346 | t = skip_user_prefix(path); |
1347 | if (!t) | |
8b0849e9 | 1348 | return -ENXIO; |
8b0849e9 | 1349 | |
329ac4bc LP |
1350 | /* And from here on it looks pretty much the same as for a |
1351 | * system unit, hence let's use the same parser from here | |
1352 | * on. */ | |
1353 | return cg_path_get_unit(t, ret); | |
ef1673d1 | 1354 | } |
ba1261bc | 1355 | |
ef1673d1 | 1356 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
7fd1b19b | 1357 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1358 | int r; |
1359 | ||
1360 | assert(unit); | |
1361 | ||
7027ff61 | 1362 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1363 | if (r < 0) |
1364 | return r; | |
1365 | ||
1366 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1367 | } |
e884315e | 1368 | |
7027ff61 | 1369 | int cg_path_get_machine_name(const char *path, char **machine) { |
89f7c846 LP |
1370 | _cleanup_free_ char *u = NULL, *sl = NULL; |
1371 | int r; | |
374ec6ab | 1372 | |
89f7c846 LP |
1373 | r = cg_path_get_unit(path, &u); |
1374 | if (r < 0) | |
1375 | return r; | |
7027ff61 | 1376 | |
89f7c846 LP |
1377 | sl = strjoin("/run/systemd/machines/unit:", u, NULL); |
1378 | if (!sl) | |
ae018d9b | 1379 | return -ENOMEM; |
aff38e74 | 1380 | |
89f7c846 | 1381 | return readlink_malloc(sl, machine); |
7027ff61 LP |
1382 | } |
1383 | ||
1384 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
7fd1b19b | 1385 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1386 | int r; |
1387 | ||
1388 | assert(machine); | |
1389 | ||
1390 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1391 | if (r < 0) | |
1392 | return r; | |
1393 | ||
1394 | return cg_path_get_machine_name(cgroup, machine); | |
1395 | } | |
1396 | ||
1397 | int cg_path_get_session(const char *path, char **session) { | |
8b0849e9 LP |
1398 | _cleanup_free_ char *unit = NULL; |
1399 | char *start, *end; | |
1400 | int r; | |
7027ff61 LP |
1401 | |
1402 | assert(path); | |
7027ff61 | 1403 | |
8b0849e9 LP |
1404 | r = cg_path_get_unit(path, &unit); |
1405 | if (r < 0) | |
1406 | return r; | |
7027ff61 | 1407 | |
8b0849e9 LP |
1408 | start = startswith(unit, "session-"); |
1409 | if (!start) | |
cfeaa44a | 1410 | return -ENXIO; |
8b0849e9 LP |
1411 | end = endswith(start, ".scope"); |
1412 | if (!end) | |
cfeaa44a | 1413 | return -ENXIO; |
8b0849e9 LP |
1414 | |
1415 | *end = 0; | |
1416 | if (!session_id_valid(start)) | |
cfeaa44a | 1417 | return -ENXIO; |
374ec6ab | 1418 | |
af08d2f9 | 1419 | if (session) { |
8b0849e9 | 1420 | char *rr; |
af08d2f9 | 1421 | |
8b0849e9 LP |
1422 | rr = strdup(start); |
1423 | if (!rr) | |
af08d2f9 LP |
1424 | return -ENOMEM; |
1425 | ||
8b0849e9 | 1426 | *session = rr; |
af08d2f9 | 1427 | } |
7027ff61 | 1428 | |
7027ff61 LP |
1429 | return 0; |
1430 | } | |
1431 | ||
1432 | int cg_pid_get_session(pid_t pid, char **session) { | |
7fd1b19b | 1433 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1434 | int r; |
1435 | ||
7027ff61 LP |
1436 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1437 | if (r < 0) | |
1438 | return r; | |
1439 | ||
1440 | return cg_path_get_session(cgroup, session); | |
1441 | } | |
1442 | ||
ae018d9b | 1443 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
374ec6ab | 1444 | _cleanup_free_ char *slice = NULL; |
8b0849e9 | 1445 | char *start, *end; |
374ec6ab | 1446 | int r; |
ae018d9b LP |
1447 | |
1448 | assert(path); | |
ae018d9b | 1449 | |
374ec6ab LP |
1450 | r = cg_path_get_slice(path, &slice); |
1451 | if (r < 0) | |
1452 | return r; | |
ae018d9b | 1453 | |
674eb685 LP |
1454 | start = startswith(slice, "user-"); |
1455 | if (!start) | |
cfeaa44a | 1456 | return -ENXIO; |
8b0849e9 | 1457 | end = endswith(start, ".slice"); |
674eb685 | 1458 | if (!end) |
cfeaa44a | 1459 | return -ENXIO; |
ae018d9b | 1460 | |
8b0849e9 LP |
1461 | *end = 0; |
1462 | if (parse_uid(start, uid) < 0) | |
cfeaa44a | 1463 | return -ENXIO; |
674eb685 | 1464 | |
674eb685 | 1465 | return 0; |
ae018d9b LP |
1466 | } |
1467 | ||
1468 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1469 | _cleanup_free_ char *cgroup = NULL; | |
1470 | int r; | |
1471 | ||
ae018d9b LP |
1472 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1473 | if (r < 0) | |
1474 | return r; | |
1475 | ||
1476 | return cg_path_get_owner_uid(cgroup, uid); | |
1477 | } | |
1478 | ||
1021b21b LP |
1479 | int cg_path_get_slice(const char *p, char **slice) { |
1480 | const char *e = NULL; | |
1021b21b LP |
1481 | |
1482 | assert(p); | |
1483 | assert(slice); | |
1484 | ||
329ac4bc LP |
1485 | /* Finds the right-most slice unit from the beginning, but |
1486 | * stops before we come to the first non-slice unit. */ | |
1487 | ||
1021b21b LP |
1488 | for (;;) { |
1489 | size_t n; | |
1490 | ||
1491 | p += strspn(p, "/"); | |
1492 | ||
1493 | n = strcspn(p, "/"); | |
8b0849e9 | 1494 | if (!valid_slice_name(p, n)) { |
1021b21b | 1495 | |
8b0849e9 LP |
1496 | if (!e) { |
1497 | char *s; | |
1021b21b | 1498 | |
8b0849e9 LP |
1499 | s = strdup("-.slice"); |
1500 | if (!s) | |
1501 | return -ENOMEM; | |
1021b21b | 1502 | |
8b0849e9 LP |
1503 | *slice = s; |
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | return cg_path_decode_unit(e, slice); | |
1021b21b LP |
1508 | } |
1509 | ||
1510 | e = p; | |
1021b21b LP |
1511 | p += n; |
1512 | } | |
1513 | } | |
1514 | ||
1515 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1516 | _cleanup_free_ char *cgroup = NULL; | |
1517 | int r; | |
1518 | ||
1519 | assert(slice); | |
1520 | ||
1521 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1522 | if (r < 0) | |
1523 | return r; | |
1524 | ||
1525 | return cg_path_get_slice(cgroup, slice); | |
1526 | } | |
1527 | ||
329ac4bc LP |
1528 | int cg_path_get_user_slice(const char *p, char **slice) { |
1529 | const char *t; | |
1530 | assert(p); | |
1531 | assert(slice); | |
1532 | ||
1533 | t = skip_user_prefix(p); | |
1534 | if (!t) | |
1535 | return -ENXIO; | |
1536 | ||
1537 | /* And now it looks pretty much the same as for a system | |
1538 | * slice, so let's just use the same parser from here on. */ | |
1539 | return cg_path_get_slice(t, slice); | |
1540 | } | |
1541 | ||
1542 | int cg_pid_get_user_slice(pid_t pid, char **slice) { | |
1543 | _cleanup_free_ char *cgroup = NULL; | |
1544 | int r; | |
1545 | ||
1546 | assert(slice); | |
1547 | ||
1548 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1549 | if (r < 0) | |
1550 | return r; | |
1551 | ||
1552 | return cg_path_get_user_slice(cgroup, slice); | |
1553 | } | |
1554 | ||
ae018d9b LP |
1555 | char *cg_escape(const char *p) { |
1556 | bool need_prefix = false; | |
1557 | ||
1558 | /* This implements very minimal escaping for names to be used | |
1559 | * as file names in the cgroup tree: any name which might | |
1560 | * conflict with a kernel name or is prefixed with '_' is | |
1561 | * prefixed with a '_'. That way, when reading cgroup names it | |
1562 | * is sufficient to remove a single prefixing underscore if | |
1563 | * there is one. */ | |
1564 | ||
1565 | /* The return value of this function (unlike cg_unescape()) | |
1566 | * needs free()! */ | |
1567 | ||
a0ab5665 LP |
1568 | if (p[0] == 0 || |
1569 | p[0] == '_' || | |
1570 | p[0] == '.' || | |
1571 | streq(p, "notify_on_release") || | |
1572 | streq(p, "release_agent") || | |
1573 | streq(p, "tasks")) | |
ae018d9b LP |
1574 | need_prefix = true; |
1575 | else { | |
1576 | const char *dot; | |
1577 | ||
1578 | dot = strrchr(p, '.'); | |
1579 | if (dot) { | |
1580 | ||
1581 | if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0) | |
1582 | need_prefix = true; | |
1583 | else { | |
1584 | char *n; | |
1585 | ||
1586 | n = strndupa(p, dot - p); | |
1587 | ||
1588 | if (check_hierarchy(n) >= 0) | |
1589 | need_prefix = true; | |
1590 | } | |
1591 | } | |
1592 | } | |
1593 | ||
1594 | if (need_prefix) | |
1595 | return strappend("_", p); | |
1596 | else | |
1597 | return strdup(p); | |
1598 | } | |
1599 | ||
1600 | char *cg_unescape(const char *p) { | |
1601 | assert(p); | |
1602 | ||
1603 | /* The return value of this function (unlike cg_escape()) | |
1604 | * doesn't need free()! */ | |
1605 | ||
1606 | if (p[0] == '_') | |
1607 | return (char*) p+1; | |
1608 | ||
1609 | return (char*) p; | |
1610 | } | |
78edb35a LP |
1611 | |
1612 | #define CONTROLLER_VALID \ | |
4b549144 | 1613 | DIGITS LETTERS \ |
78edb35a LP |
1614 | "_" |
1615 | ||
185a0874 | 1616 | bool cg_controller_is_valid(const char *p) { |
78edb35a LP |
1617 | const char *t, *s; |
1618 | ||
1619 | if (!p) | |
1620 | return false; | |
1621 | ||
185a0874 DJL |
1622 | s = startswith(p, "name="); |
1623 | if (s) | |
1624 | p = s; | |
78edb35a LP |
1625 | |
1626 | if (*p == 0 || *p == '_') | |
1627 | return false; | |
1628 | ||
1629 | for (t = p; *t; t++) | |
1630 | if (!strchr(CONTROLLER_VALID, *t)) | |
1631 | return false; | |
1632 | ||
1633 | if (t - p > FILENAME_MAX) | |
1634 | return false; | |
1635 | ||
1636 | return true; | |
1637 | } | |
a016b922 LP |
1638 | |
1639 | int cg_slice_to_path(const char *unit, char **ret) { | |
1640 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1641 | const char *dash; | |
7410616c | 1642 | int r; |
a016b922 LP |
1643 | |
1644 | assert(unit); | |
1645 | assert(ret); | |
1646 | ||
c96cc582 LP |
1647 | if (streq(unit, "-.slice")) { |
1648 | char *x; | |
1649 | ||
1650 | x = strdup(""); | |
1651 | if (!x) | |
1652 | return -ENOMEM; | |
1653 | *ret = x; | |
1654 | return 0; | |
1655 | } | |
1656 | ||
7410616c | 1657 | if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) |
a016b922 LP |
1658 | return -EINVAL; |
1659 | ||
1660 | if (!endswith(unit, ".slice")) | |
1661 | return -EINVAL; | |
1662 | ||
7410616c LP |
1663 | r = unit_name_to_prefix(unit, &p); |
1664 | if (r < 0) | |
1665 | return r; | |
a016b922 LP |
1666 | |
1667 | dash = strchr(p, '-'); | |
e66e5b61 LP |
1668 | |
1669 | /* Don't allow initial dashes */ | |
1670 | if (dash == p) | |
1671 | return -EINVAL; | |
1672 | ||
a016b922 LP |
1673 | while (dash) { |
1674 | _cleanup_free_ char *escaped = NULL; | |
1675 | char n[dash - p + sizeof(".slice")]; | |
1676 | ||
e66e5b61 LP |
1677 | /* Don't allow trailing or double dashes */ |
1678 | if (dash[1] == 0 || dash[1] == '-') | |
c96cc582 | 1679 | return -EINVAL; |
a016b922 | 1680 | |
c96cc582 | 1681 | strcpy(stpncpy(n, p, dash - p), ".slice"); |
7410616c | 1682 | if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) |
a016b922 LP |
1683 | return -EINVAL; |
1684 | ||
1685 | escaped = cg_escape(n); | |
1686 | if (!escaped) | |
1687 | return -ENOMEM; | |
1688 | ||
1689 | if (!strextend(&s, escaped, "/", NULL)) | |
1690 | return -ENOMEM; | |
1691 | ||
1692 | dash = strchr(dash+1, '-'); | |
1693 | } | |
1694 | ||
1695 | e = cg_escape(unit); | |
1696 | if (!e) | |
1697 | return -ENOMEM; | |
1698 | ||
1699 | if (!strextend(&s, e, NULL)) | |
1700 | return -ENOMEM; | |
1701 | ||
1702 | *ret = s; | |
1703 | s = NULL; | |
1704 | ||
1705 | return 0; | |
1706 | } | |
4ad49000 LP |
1707 | |
1708 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
1709 | _cleanup_free_ char *p = NULL; | |
1710 | int r; | |
1711 | ||
1712 | r = cg_get_path(controller, path, attribute, &p); | |
1713 | if (r < 0) | |
1714 | return r; | |
1715 | ||
4c1fc3e4 | 1716 | return write_string_file(p, value, 0); |
4ad49000 LP |
1717 | } |
1718 | ||
934277fe LP |
1719 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
1720 | _cleanup_free_ char *p = NULL; | |
1721 | int r; | |
1722 | ||
1723 | r = cg_get_path(controller, path, attribute, &p); | |
1724 | if (r < 0) | |
1725 | return r; | |
1726 | ||
1727 | return read_one_line_file(p, ret); | |
1728 | } | |
1729 | ||
4ad49000 LP |
1730 | static const char mask_names[] = |
1731 | "cpu\0" | |
1732 | "cpuacct\0" | |
1733 | "blkio\0" | |
1734 | "memory\0" | |
1735 | "devices\0"; | |
1736 | ||
13b84ec7 | 1737 | int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) { |
4ad49000 LP |
1738 | CGroupControllerMask bit = 1; |
1739 | const char *n; | |
1740 | int r; | |
1741 | ||
1742 | /* This one will create a cgroup in our private tree, but also | |
1743 | * duplicate it in the trees specified in mask, and remove it | |
1744 | * in all others */ | |
1745 | ||
1746 | /* First create the cgroup in our own hierarchy. */ | |
1747 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
1748 | if (r < 0) | |
1749 | return r; | |
1750 | ||
1751 | /* Then, do the same in the other hierarchies */ | |
1752 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 | 1753 | if (mask & bit) |
4ad49000 | 1754 | cg_create(n, path); |
13b84ec7 | 1755 | else if (supported & bit) |
4ad49000 LP |
1756 | cg_trim(n, path, true); |
1757 | ||
1758 | bit <<= 1; | |
1759 | } | |
1760 | ||
13b84ec7 | 1761 | return 0; |
4ad49000 LP |
1762 | } |
1763 | ||
7b3fd631 | 1764 | int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { |
4ad49000 LP |
1765 | CGroupControllerMask bit = 1; |
1766 | const char *n; | |
1767 | int r; | |
1768 | ||
1769 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
13b84ec7 LP |
1770 | if (r < 0) |
1771 | return r; | |
4ad49000 LP |
1772 | |
1773 | NULSTR_FOREACH(n, mask_names) { | |
7b3fd631 LP |
1774 | |
1775 | if (supported & bit) { | |
1776 | const char *p = NULL; | |
1777 | ||
1778 | if (path_callback) | |
1779 | p = path_callback(bit, userdata); | |
1780 | ||
1781 | if (!p) | |
1782 | p = path; | |
1783 | ||
edf5b3b8 | 1784 | cg_attach_fallback(n, p, pid); |
7b3fd631 | 1785 | } |
4ad49000 LP |
1786 | |
1787 | bit <<= 1; | |
1788 | } | |
1789 | ||
13b84ec7 | 1790 | return 0; |
4ad49000 LP |
1791 | } |
1792 | ||
7b3fd631 | 1793 | int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { |
6c12b52e LP |
1794 | Iterator i; |
1795 | void *pidp; | |
1796 | int r = 0; | |
1797 | ||
1798 | SET_FOREACH(pidp, pids, i) { | |
1799 | pid_t pid = PTR_TO_LONG(pidp); | |
13b84ec7 | 1800 | int q; |
6c12b52e | 1801 | |
7b3fd631 | 1802 | q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); |
13b84ec7 LP |
1803 | if (q < 0) |
1804 | r = q; | |
6c12b52e LP |
1805 | } |
1806 | ||
1807 | return r; | |
1808 | } | |
1809 | ||
03b90d4b | 1810 | int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
4ad49000 LP |
1811 | CGroupControllerMask bit = 1; |
1812 | const char *n; | |
1813 | int r; | |
1814 | ||
13b84ec7 LP |
1815 | if (!path_equal(from, to)) { |
1816 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true); | |
1817 | if (r < 0) | |
1818 | return r; | |
1819 | } | |
4ad49000 LP |
1820 | |
1821 | NULSTR_FOREACH(n, mask_names) { | |
03b90d4b LP |
1822 | if (supported & bit) { |
1823 | const char *p = NULL; | |
1824 | ||
1825 | if (to_callback) | |
1826 | p = to_callback(bit, userdata); | |
1827 | ||
1828 | if (!p) | |
1829 | p = to; | |
1830 | ||
1831 | cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false); | |
1832 | } | |
4ad49000 LP |
1833 | |
1834 | bit <<= 1; | |
1835 | } | |
1836 | ||
13b84ec7 | 1837 | return 0; |
4ad49000 LP |
1838 | } |
1839 | ||
13b84ec7 | 1840 | int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) { |
4ad49000 LP |
1841 | CGroupControllerMask bit = 1; |
1842 | const char *n; | |
1843 | int r; | |
1844 | ||
1845 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
1846 | if (r < 0) | |
1847 | return r; | |
1848 | ||
1849 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 | 1850 | if (supported & bit) |
4ad49000 LP |
1851 | cg_trim(n, path, delete_root); |
1852 | ||
1853 | bit <<= 1; | |
1854 | } | |
1855 | ||
13b84ec7 | 1856 | return 0; |
4ad49000 LP |
1857 | } |
1858 | ||
1859 | CGroupControllerMask cg_mask_supported(void) { | |
1860 | CGroupControllerMask bit = 1, mask = 0; | |
1861 | const char *n; | |
1862 | ||
1863 | NULSTR_FOREACH(n, mask_names) { | |
1864 | if (check_hierarchy(n) >= 0) | |
1865 | mask |= bit; | |
1866 | ||
1867 | bit <<= 1; | |
1868 | } | |
1869 | ||
1870 | return mask; | |
1871 | } | |
b12afc8c LP |
1872 | |
1873 | int cg_kernel_controllers(Set *controllers) { | |
1874 | _cleanup_fclose_ FILE *f = NULL; | |
1875 | char buf[LINE_MAX]; | |
1876 | int r; | |
1877 | ||
1878 | assert(controllers); | |
1879 | ||
1880 | f = fopen("/proc/cgroups", "re"); | |
1881 | if (!f) { | |
1882 | if (errno == ENOENT) | |
1883 | return 0; | |
1884 | return -errno; | |
1885 | } | |
1886 | ||
1887 | /* Ignore the header line */ | |
1888 | (void) fgets(buf, sizeof(buf), f); | |
1889 | ||
1890 | for (;;) { | |
1891 | char *controller; | |
1892 | int enabled = 0; | |
1893 | ||
1894 | errno = 0; | |
1895 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { | |
1896 | ||
1897 | if (feof(f)) | |
1898 | break; | |
1899 | ||
1900 | if (ferror(f) && errno) | |
1901 | return -errno; | |
1902 | ||
1903 | return -EBADMSG; | |
1904 | } | |
1905 | ||
1906 | if (!enabled) { | |
1907 | free(controller); | |
1908 | continue; | |
1909 | } | |
1910 | ||
1911 | if (!filename_is_valid(controller)) { | |
1912 | free(controller); | |
1913 | return -EBADMSG; | |
1914 | } | |
1915 | ||
1916 | r = set_consume(controllers, controller); | |
1917 | if (r < 0) | |
1918 | return r; | |
1919 | } | |
1920 | ||
1921 | return 0; | |
1922 | } |