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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" |
8b0849e9 | 43 | #include "login-shared.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 | ||
246aa6dd LP |
324 | r = cg_attach(cto, pto, pid); |
325 | if (r < 0) { | |
4c633005 | 326 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
327 | ret = r; |
328 | } else if (ret == 0) | |
329 | ret = 1; | |
8c6db833 | 330 | |
8c6db833 | 331 | done = false; |
35d2e7ec | 332 | |
246aa6dd LP |
333 | r = set_put(s, LONG_TO_PTR(pid)); |
334 | if (r < 0) { | |
35d2e7ec | 335 | if (ret >= 0) |
7027ff61 | 336 | return r; |
35d2e7ec | 337 | |
246aa6dd | 338 | return ret; |
35d2e7ec LP |
339 | } |
340 | } | |
341 | ||
342 | if (r < 0) { | |
343 | if (ret >= 0) | |
7027ff61 | 344 | return r; |
35d2e7ec | 345 | |
246aa6dd | 346 | return ret; |
8c6db833 | 347 | } |
35d2e7ec | 348 | } while (!done); |
8c6db833 | 349 | |
35d2e7ec | 350 | return ret; |
8c6db833 LP |
351 | } |
352 | ||
4ad49000 LP |
353 | int cg_migrate_recursive( |
354 | const char *cfrom, | |
355 | const char *pfrom, | |
356 | const char *cto, | |
357 | const char *pto, | |
358 | bool ignore_self, | |
359 | bool rem) { | |
360 | ||
246aa6dd | 361 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 362 | int r, ret = 0; |
35d2e7ec | 363 | char *fn; |
8c6db833 | 364 | |
246aa6dd LP |
365 | assert(cfrom); |
366 | assert(pfrom); | |
367 | assert(cto); | |
368 | assert(pto); | |
8c6db833 | 369 | |
246aa6dd | 370 | ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self); |
8c6db833 | 371 | |
246aa6dd LP |
372 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
373 | if (r < 0) { | |
4c633005 | 374 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
375 | return r; |
376 | ||
246aa6dd | 377 | return ret; |
35d2e7ec LP |
378 | } |
379 | ||
380 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 381 | _cleanup_free_ char *p = NULL; |
8c6db833 | 382 | |
246aa6dd | 383 | p = strjoin(pfrom, "/", fn, NULL); |
35d2e7ec | 384 | free(fn); |
246aa6dd | 385 | if (!p) { |
35d2e7ec | 386 | if (ret >= 0) |
7027ff61 | 387 | return -ENOMEM; |
35d2e7ec | 388 | |
246aa6dd | 389 | return ret; |
8c6db833 LP |
390 | } |
391 | ||
246aa6dd | 392 | r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem); |
35d2e7ec LP |
393 | if (r != 0 && ret >= 0) |
394 | ret = r; | |
8c6db833 LP |
395 | } |
396 | ||
35d2e7ec LP |
397 | if (r < 0 && ret >= 0) |
398 | ret = r; | |
399 | ||
246aa6dd | 400 | if (rem) { |
4ad49000 | 401 | r = cg_rmdir(cfrom, pfrom); |
246aa6dd LP |
402 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
403 | return r; | |
404 | } | |
8c6db833 LP |
405 | |
406 | return ret; | |
407 | } | |
408 | ||
13b84ec7 LP |
409 | int cg_migrate_recursive_fallback( |
410 | const char *cfrom, | |
411 | const char *pfrom, | |
412 | const char *cto, | |
413 | const char *pto, | |
414 | bool ignore_self, | |
415 | bool rem) { | |
416 | ||
417 | int r; | |
418 | ||
419 | assert(cfrom); | |
420 | assert(pfrom); | |
421 | assert(cto); | |
422 | assert(pto); | |
423 | ||
424 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem); | |
425 | if (r < 0) { | |
426 | char prefix[strlen(pto) + 1]; | |
427 | ||
428 | /* This didn't work? Then let's try all prefixes of the destination */ | |
429 | ||
fecffe5d | 430 | PATH_FOREACH_PREFIX(prefix, pto) { |
13b84ec7 LP |
431 | r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem); |
432 | if (r >= 0) | |
433 | break; | |
434 | } | |
435 | } | |
436 | ||
fecffe5d | 437 | return 0; |
13b84ec7 LP |
438 | } |
439 | ||
3474ae3c LP |
440 | static const char *normalize_controller(const char *controller) { |
441 | ||
7027ff61 LP |
442 | assert(controller); |
443 | ||
3474ae3c LP |
444 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
445 | return "systemd"; | |
446 | else if (startswith(controller, "name=")) | |
447 | return controller + 5; | |
448 | else | |
449 | return controller; | |
450 | } | |
451 | ||
452 | static int join_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
018ef268 | 453 | char *t = NULL; |
3474ae3c | 454 | |
9444b1f2 LP |
455 | if (!isempty(controller)) { |
456 | if (!isempty(path) && !isempty(suffix)) | |
b7def684 | 457 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL); |
9444b1f2 | 458 | else if (!isempty(path)) |
b7def684 | 459 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL); |
9444b1f2 | 460 | else if (!isempty(suffix)) |
b7def684 | 461 | t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL); |
c3175a7f | 462 | else |
7027ff61 | 463 | t = strappend("/sys/fs/cgroup/", controller); |
c3175a7f | 464 | } else { |
9444b1f2 | 465 | if (!isempty(path) && !isempty(suffix)) |
b7def684 | 466 | t = strjoin(path, "/", suffix, NULL); |
9444b1f2 | 467 | else if (!isempty(path)) |
c3175a7f | 468 | t = strdup(path); |
7027ff61 LP |
469 | else |
470 | return -EINVAL; | |
c3175a7f | 471 | } |
3474ae3c LP |
472 | |
473 | if (!t) | |
474 | return -ENOMEM; | |
475 | ||
dbb9401d | 476 | *fs = path_kill_slashes(t); |
3474ae3c LP |
477 | return 0; |
478 | } | |
479 | ||
8c6db833 | 480 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
dbd821ac | 481 | const char *p; |
ec202eae | 482 | static thread_local bool good = false; |
8c6db833 | 483 | |
dbd821ac LP |
484 | assert(fs); |
485 | ||
78edb35a LP |
486 | if (controller && !cg_controller_is_valid(controller, true)) |
487 | return -EINVAL; | |
488 | ||
3bfc7184 | 489 | if (_unlikely_(!good)) { |
70132bd0 LP |
490 | int r; |
491 | ||
0c85a4f3 | 492 | r = path_is_mount_point("/sys/fs/cgroup", false); |
da00518b LP |
493 | if (r < 0) |
494 | return r; | |
495 | if (r == 0) | |
496 | return -ENOENT; | |
70132bd0 LP |
497 | |
498 | /* Cache this to save a few stat()s */ | |
499 | good = true; | |
500 | } | |
501 | ||
c3175a7f | 502 | p = controller ? normalize_controller(controller) : NULL; |
7027ff61 | 503 | |
3474ae3c LP |
504 | return join_path(p, path, suffix, fs); |
505 | } | |
dbd821ac | 506 | |
7027ff61 | 507 | static int check_hierarchy(const char *p) { |
b12afc8c | 508 | const char *cc; |
37099707 LP |
509 | |
510 | assert(p); | |
511 | ||
b12afc8c LP |
512 | if (!filename_is_valid(p)) |
513 | return 0; | |
514 | ||
37099707 | 515 | /* Check if this controller actually really exists */ |
63c372cb | 516 | cc = strjoina("/sys/fs/cgroup/", p); |
b12afc8c | 517 | if (laccess(cc, F_OK) < 0) |
37099707 LP |
518 | return -errno; |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
3474ae3c LP |
523 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
524 | const char *p; | |
37099707 | 525 | int r; |
dbd821ac | 526 | |
3474ae3c | 527 | assert(fs); |
70132bd0 | 528 | |
78edb35a | 529 | if (!cg_controller_is_valid(controller, true)) |
3474ae3c | 530 | return -EINVAL; |
70132bd0 | 531 | |
37099707 | 532 | /* Normalize the controller syntax */ |
3474ae3c | 533 | p = normalize_controller(controller); |
8c6db833 | 534 | |
3474ae3c | 535 | /* Check if this controller actually really exists */ |
7027ff61 | 536 | r = check_hierarchy(p); |
37099707 LP |
537 | if (r < 0) |
538 | return r; | |
3474ae3c LP |
539 | |
540 | return join_path(p, path, suffix, fs); | |
8c6db833 LP |
541 | } |
542 | ||
e27796a0 | 543 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
4ad49000 LP |
544 | assert(path); |
545 | assert(sb); | |
546 | assert(ftwbuf); | |
e27796a0 LP |
547 | |
548 | if (typeflag != FTW_DP) | |
549 | return 0; | |
550 | ||
551 | if (ftwbuf->level < 1) | |
552 | return 0; | |
553 | ||
e27796a0 LP |
554 | rmdir(path); |
555 | return 0; | |
556 | } | |
557 | ||
8c6db833 | 558 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 559 | _cleanup_free_ char *fs = NULL; |
e27796a0 | 560 | int r = 0; |
8c6db833 | 561 | |
8c6db833 LP |
562 | assert(path); |
563 | ||
e27796a0 LP |
564 | r = cg_get_path(controller, path, NULL, &fs); |
565 | if (r < 0) | |
8c6db833 LP |
566 | return r; |
567 | ||
e27796a0 | 568 | errno = 0; |
7027ff61 | 569 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) |
e27796a0 LP |
570 | r = errno ? -errno : -EIO; |
571 | ||
572 | if (delete_root) { | |
4ad49000 LP |
573 | if (rmdir(fs) < 0 && errno != ENOENT) |
574 | return -errno; | |
e27796a0 LP |
575 | } |
576 | ||
e27796a0 | 577 | return r; |
8c6db833 LP |
578 | } |
579 | ||
580 | int cg_delete(const char *controller, const char *path) { | |
7027ff61 | 581 | _cleanup_free_ char *parent = NULL; |
8c6db833 LP |
582 | int r; |
583 | ||
8c6db833 LP |
584 | assert(path); |
585 | ||
7027ff61 LP |
586 | r = path_get_parent(path, &parent); |
587 | if (r < 0) | |
35d2e7ec | 588 | return r; |
8c6db833 | 589 | |
246aa6dd | 590 | r = cg_migrate_recursive(controller, path, controller, parent, false, true); |
4c633005 | 591 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
592 | } |
593 | ||
1434ae6f LP |
594 | int cg_create(const char *controller, const char *path) { |
595 | _cleanup_free_ char *fs = NULL; | |
596 | int r; | |
597 | ||
598 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
599 | if (r < 0) | |
600 | return r; | |
601 | ||
602 | r = mkdir_parents(fs, 0755); | |
603 | if (r < 0) | |
604 | return r; | |
605 | ||
606 | if (mkdir(fs, 0755) < 0) { | |
607 | ||
608 | if (errno == EEXIST) | |
609 | return 0; | |
610 | ||
611 | return -errno; | |
612 | } | |
613 | ||
614 | return 1; | |
615 | } | |
616 | ||
617 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
618 | int r, q; | |
619 | ||
620 | assert(pid >= 0); | |
621 | ||
622 | r = cg_create(controller, path); | |
623 | if (r < 0) | |
624 | return r; | |
625 | ||
626 | q = cg_attach(controller, path, pid); | |
627 | if (q < 0) | |
628 | return q; | |
629 | ||
630 | /* This does not remove the cgroup on failure */ | |
631 | return r; | |
632 | } | |
633 | ||
8c6db833 | 634 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
635 | _cleanup_free_ char *fs = NULL; |
636 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
637 | int r; |
638 | ||
8c6db833 LP |
639 | assert(path); |
640 | assert(pid >= 0); | |
641 | ||
b043cd0b | 642 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
3474ae3c | 643 | if (r < 0) |
c6c18be3 | 644 | return r; |
8c6db833 LP |
645 | |
646 | if (pid == 0) | |
647 | pid = getpid(); | |
648 | ||
de0671ee | 649 | snprintf(c, sizeof(c), PID_FMT"\n", pid); |
8c6db833 | 650 | |
70c949a4 | 651 | return write_string_file_no_create(fs, c); |
8c6db833 LP |
652 | } |
653 | ||
13b84ec7 LP |
654 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
655 | int r; | |
656 | ||
657 | assert(controller); | |
658 | assert(path); | |
659 | assert(pid >= 0); | |
660 | ||
661 | r = cg_attach(controller, path, pid); | |
662 | if (r < 0) { | |
663 | char prefix[strlen(path) + 1]; | |
664 | ||
665 | /* This didn't work? Then let's try all prefixes of | |
666 | * the destination */ | |
667 | ||
fecffe5d | 668 | PATH_FOREACH_PREFIX(prefix, path) { |
13b84ec7 LP |
669 | r = cg_attach(controller, prefix, pid); |
670 | if (r >= 0) | |
671 | break; | |
672 | } | |
673 | } | |
674 | ||
fecffe5d | 675 | return 0; |
13b84ec7 LP |
676 | } |
677 | ||
2d76d14e LP |
678 | int cg_set_group_access( |
679 | const char *controller, | |
680 | const char *path, | |
681 | mode_t mode, | |
682 | uid_t uid, | |
683 | gid_t gid) { | |
684 | ||
574d5f2d | 685 | _cleanup_free_ char *fs = NULL; |
8c6db833 LP |
686 | int r; |
687 | ||
8c6db833 LP |
688 | assert(path); |
689 | ||
fed1e721 | 690 | if (mode != MODE_INVALID) |
8d53b453 LP |
691 | mode &= 0777; |
692 | ||
693 | r = cg_get_path(controller, path, NULL, &fs); | |
694 | if (r < 0) | |
8c6db833 LP |
695 | return r; |
696 | ||
574d5f2d | 697 | return chmod_and_chown(fs, mode, uid, gid); |
8c6db833 LP |
698 | } |
699 | ||
974efc46 LP |
700 | int cg_set_task_access( |
701 | const char *controller, | |
702 | const char *path, | |
703 | mode_t mode, | |
704 | uid_t uid, | |
4ad49000 | 705 | gid_t gid) { |
974efc46 LP |
706 | |
707 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
8c6db833 LP |
708 | int r; |
709 | ||
8c6db833 LP |
710 | assert(path); |
711 | ||
fed1e721 | 712 | if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
8d53b453 LP |
713 | return 0; |
714 | ||
fed1e721 | 715 | if (mode != MODE_INVALID) |
8d53b453 LP |
716 | mode &= 0666; |
717 | ||
b043cd0b | 718 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
8d53b453 | 719 | if (r < 0) |
8c6db833 LP |
720 | return r; |
721 | ||
722 | r = chmod_and_chown(fs, mode, uid, gid); | |
974efc46 LP |
723 | if (r < 0) |
724 | return r; | |
8c6db833 | 725 | |
b043cd0b LP |
726 | /* Compatibility, Always keep values for "tasks" in sync with |
727 | * "cgroup.procs" */ | |
728 | r = cg_get_path(controller, path, "tasks", &procs); | |
974efc46 LP |
729 | if (r < 0) |
730 | return r; | |
731 | ||
732 | return chmod_and_chown(procs, mode, uid, gid); | |
8c6db833 LP |
733 | } |
734 | ||
7027ff61 | 735 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
7027ff61 LP |
736 | _cleanup_fclose_ FILE *f = NULL; |
737 | char line[LINE_MAX]; | |
8af8afd6 | 738 | const char *fs; |
c6c18be3 | 739 | size_t cs; |
8c6db833 | 740 | |
8c6db833 | 741 | assert(path); |
c6c18be3 | 742 | assert(pid >= 0); |
8c6db833 | 743 | |
8af8afd6 LP |
744 | if (controller) { |
745 | if (!cg_controller_is_valid(controller, true)) | |
746 | return -EINVAL; | |
78edb35a | 747 | |
8af8afd6 LP |
748 | controller = normalize_controller(controller); |
749 | } else | |
7027ff61 LP |
750 | controller = SYSTEMD_CGROUP_CONTROLLER; |
751 | ||
b68fa010 | 752 | fs = procfs_file_alloca(pid, "cgroup"); |
8c6db833 | 753 | |
c6c18be3 | 754 | f = fopen(fs, "re"); |
4c633005 LP |
755 | if (!f) |
756 | return errno == ENOENT ? -ESRCH : -errno; | |
757 | ||
c6c18be3 LP |
758 | cs = strlen(controller); |
759 | ||
7027ff61 | 760 | FOREACH_LINE(line, f, return -errno) { |
a2a5291b | 761 | char *l, *p, *e; |
8af8afd6 | 762 | size_t k; |
a2a5291b | 763 | const char *word, *state; |
8af8afd6 | 764 | bool found = false; |
c6c18be3 LP |
765 | |
766 | truncate_nl(line); | |
767 | ||
7027ff61 LP |
768 | l = strchr(line, ':'); |
769 | if (!l) | |
c6c18be3 LP |
770 | continue; |
771 | ||
772 | l++; | |
8af8afd6 LP |
773 | e = strchr(l, ':'); |
774 | if (!e) | |
c6c18be3 LP |
775 | continue; |
776 | ||
8af8afd6 LP |
777 | *e = 0; |
778 | ||
a2a5291b | 779 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { |
8af8afd6 | 780 | |
a2a5291b | 781 | if (k == cs && memcmp(word, controller, cs) == 0) { |
8af8afd6 LP |
782 | found = true; |
783 | break; | |
784 | } | |
785 | ||
786 | if (k == 5 + cs && | |
a2a5291b ZJS |
787 | memcmp(word, "name=", 5) == 0 && |
788 | memcmp(word+5, controller, cs) == 0) { | |
8af8afd6 LP |
789 | found = true; |
790 | break; | |
791 | } | |
792 | } | |
793 | ||
794 | if (!found) | |
c6c18be3 LP |
795 | continue; |
796 | ||
8af8afd6 | 797 | p = strdup(e + 1); |
7027ff61 LP |
798 | if (!p) |
799 | return -ENOMEM; | |
c6c18be3 LP |
800 | |
801 | *path = p; | |
7027ff61 | 802 | return 0; |
c6c18be3 LP |
803 | } |
804 | ||
7027ff61 | 805 | return -ENOENT; |
8c6db833 LP |
806 | } |
807 | ||
808 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 LP |
809 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
810 | char *sc; | |
8c6db833 LP |
811 | int r; |
812 | ||
8c6db833 LP |
813 | assert(agent); |
814 | ||
7027ff61 LP |
815 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
816 | if (r < 0) | |
c6c18be3 | 817 | return r; |
8c6db833 | 818 | |
7027ff61 LP |
819 | r = read_one_line_file(fs, &contents); |
820 | if (r < 0) | |
821 | return r; | |
8c6db833 LP |
822 | |
823 | sc = strstrip(contents); | |
8c6db833 | 824 | if (sc[0] == 0) { |
70c949a4 | 825 | r = write_string_file_no_create(fs, agent); |
574d5f2d | 826 | if (r < 0) |
7027ff61 LP |
827 | return r; |
828 | } else if (!streq(sc, agent)) | |
829 | return -EEXIST; | |
8c6db833 | 830 | |
c6c18be3 LP |
831 | free(fs); |
832 | fs = NULL; | |
7027ff61 LP |
833 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
834 | if (r < 0) | |
835 | return r; | |
8c6db833 LP |
836 | |
837 | free(contents); | |
838 | contents = NULL; | |
7027ff61 LP |
839 | r = read_one_line_file(fs, &contents); |
840 | if (r < 0) | |
841 | return r; | |
8c6db833 LP |
842 | |
843 | sc = strstrip(contents); | |
8c6db833 | 844 | if (streq(sc, "0")) { |
70c949a4 | 845 | r = write_string_file_no_create(fs, "1"); |
7027ff61 LP |
846 | if (r < 0) |
847 | return r; | |
c6c18be3 | 848 | |
7027ff61 LP |
849 | return 1; |
850 | } | |
8c6db833 | 851 | |
7027ff61 LP |
852 | if (!streq(sc, "1")) |
853 | return -EIO; | |
8c6db833 | 854 | |
7027ff61 | 855 | return 0; |
8c6db833 LP |
856 | } |
857 | ||
ad929bcc KS |
858 | int cg_uninstall_release_agent(const char *controller) { |
859 | _cleanup_free_ char *fs = NULL; | |
860 | int r; | |
861 | ||
ac9ef333 LP |
862 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
863 | if (r < 0) | |
864 | return r; | |
865 | ||
70c949a4 | 866 | r = write_string_file_no_create(fs, "0"); |
ac9ef333 LP |
867 | if (r < 0) |
868 | return r; | |
869 | ||
870 | free(fs); | |
871 | fs = NULL; | |
872 | ||
ad929bcc KS |
873 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
874 | if (r < 0) | |
875 | return r; | |
876 | ||
70c949a4 | 877 | r = write_string_file_no_create(fs, ""); |
ad929bcc KS |
878 | if (r < 0) |
879 | return r; | |
880 | ||
ac9ef333 | 881 | return 0; |
ad929bcc KS |
882 | } |
883 | ||
8c6db833 | 884 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { |
7027ff61 | 885 | _cleanup_fclose_ FILE *f = NULL; |
c3175a7f | 886 | pid_t pid = 0, self_pid; |
c6c18be3 | 887 | bool found = false; |
7027ff61 | 888 | int r; |
8c6db833 | 889 | |
8c6db833 LP |
890 | assert(path); |
891 | ||
b043cd0b | 892 | r = cg_enumerate_processes(controller, path, &f); |
c3175a7f | 893 | if (r < 0) |
4c633005 | 894 | return r == -ENOENT ? 1 : r; |
8c6db833 | 895 | |
c3175a7f LP |
896 | self_pid = getpid(); |
897 | ||
c6c18be3 | 898 | while ((r = cg_read_pid(f, &pid)) > 0) { |
8c6db833 | 899 | |
c3175a7f | 900 | if (ignore_self && pid == self_pid) |
c6c18be3 | 901 | continue; |
8c6db833 | 902 | |
c6c18be3 LP |
903 | found = true; |
904 | break; | |
8c6db833 LP |
905 | } |
906 | ||
c6c18be3 LP |
907 | if (r < 0) |
908 | return r; | |
8c6db833 | 909 | |
c6c18be3 | 910 | return !found; |
8c6db833 LP |
911 | } |
912 | ||
913 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { | |
7027ff61 | 914 | _cleanup_closedir_ DIR *d = NULL; |
35d2e7ec | 915 | char *fn; |
7027ff61 | 916 | int r; |
8c6db833 | 917 | |
8c6db833 LP |
918 | assert(path); |
919 | ||
c3175a7f LP |
920 | r = cg_is_empty(controller, path, ignore_self); |
921 | if (r <= 0) | |
35d2e7ec LP |
922 | return r; |
923 | ||
c3175a7f LP |
924 | r = cg_enumerate_subgroups(controller, path, &d); |
925 | if (r < 0) | |
4c633005 | 926 | return r == -ENOENT ? 1 : r; |
8c6db833 | 927 | |
35d2e7ec | 928 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 929 | _cleanup_free_ char *p = NULL; |
8c6db833 | 930 | |
7027ff61 | 931 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 932 | free(fn); |
7027ff61 LP |
933 | if (!p) |
934 | return -ENOMEM; | |
8c6db833 | 935 | |
35d2e7ec | 936 | r = cg_is_empty_recursive(controller, p, ignore_self); |
35d2e7ec | 937 | if (r <= 0) |
7027ff61 | 938 | return r; |
35d2e7ec LP |
939 | } |
940 | ||
7027ff61 LP |
941 | if (r < 0) |
942 | return r; | |
35d2e7ec | 943 | |
7027ff61 | 944 | return 1; |
35d2e7ec LP |
945 | } |
946 | ||
947 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
948 | const char *e; | |
949 | char *t = NULL, *u = NULL; | |
5954c074 | 950 | _cleanup_free_ char *v = NULL; |
35d2e7ec LP |
951 | |
952 | assert(spec); | |
35d2e7ec LP |
953 | |
954 | if (*spec == '/') { | |
e884315e LP |
955 | if (!path_is_safe(spec)) |
956 | return -EINVAL; | |
35d2e7ec LP |
957 | |
958 | if (path) { | |
246aa6dd LP |
959 | t = strdup(spec); |
960 | if (!t) | |
35d2e7ec LP |
961 | return -ENOMEM; |
962 | ||
dbb9401d | 963 | *path = path_kill_slashes(t); |
8c6db833 LP |
964 | } |
965 | ||
35d2e7ec LP |
966 | if (controller) |
967 | *controller = NULL; | |
968 | ||
969 | return 0; | |
8c6db833 LP |
970 | } |
971 | ||
246aa6dd LP |
972 | e = strchr(spec, ':'); |
973 | if (!e) { | |
78edb35a | 974 | if (!cg_controller_is_valid(spec, true)) |
35d2e7ec LP |
975 | return -EINVAL; |
976 | ||
977 | if (controller) { | |
5954c074 | 978 | t = strdup(normalize_controller(spec)); |
246aa6dd | 979 | if (!t) |
35d2e7ec LP |
980 | return -ENOMEM; |
981 | ||
982 | *controller = t; | |
983 | } | |
984 | ||
985 | if (path) | |
986 | *path = NULL; | |
987 | ||
988 | return 0; | |
8c6db833 LP |
989 | } |
990 | ||
5954c074 LP |
991 | v = strndup(spec, e-spec); |
992 | if (!v) | |
993 | return -ENOMEM; | |
994 | t = strdup(normalize_controller(v)); | |
e884315e LP |
995 | if (!t) |
996 | return -ENOMEM; | |
78edb35a | 997 | if (!cg_controller_is_valid(t, true)) { |
e884315e | 998 | free(t); |
35d2e7ec | 999 | return -EINVAL; |
246aa6dd LP |
1000 | } |
1001 | ||
baa89da4 LP |
1002 | if (streq(e+1, "")) { |
1003 | u = strdup("/"); | |
1004 | if (!u) { | |
1005 | free(t); | |
1006 | return -ENOMEM; | |
1007 | } | |
1008 | } else { | |
1009 | u = strdup(e+1); | |
1010 | if (!u) { | |
1011 | free(t); | |
1012 | return -ENOMEM; | |
1013 | } | |
35d2e7ec | 1014 | |
baa89da4 LP |
1015 | if (!path_is_safe(u) || |
1016 | !path_is_absolute(u)) { | |
1017 | free(t); | |
1018 | free(u); | |
1019 | return -EINVAL; | |
1020 | } | |
1021 | ||
1022 | path_kill_slashes(u); | |
1023 | } | |
5954c074 | 1024 | |
35d2e7ec LP |
1025 | if (controller) |
1026 | *controller = t; | |
e884315e LP |
1027 | else |
1028 | free(t); | |
35d2e7ec LP |
1029 | |
1030 | if (path) | |
1031 | *path = u; | |
e884315e LP |
1032 | else |
1033 | free(u); | |
35d2e7ec LP |
1034 | |
1035 | return 0; | |
8c6db833 | 1036 | } |
c6c18be3 | 1037 | |
7027ff61 | 1038 | int cg_mangle_path(const char *path, char **result) { |
78edb35a LP |
1039 | _cleanup_free_ char *c = NULL, *p = NULL; |
1040 | char *t; | |
35d2e7ec LP |
1041 | int r; |
1042 | ||
1043 | assert(path); | |
1044 | assert(result); | |
1045 | ||
73e231ab | 1046 | /* First, check if it already is a filesystem path */ |
7027ff61 | 1047 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 1048 | |
b69d29ce LP |
1049 | t = strdup(path); |
1050 | if (!t) | |
35d2e7ec LP |
1051 | return -ENOMEM; |
1052 | ||
dbb9401d | 1053 | *result = path_kill_slashes(t); |
35d2e7ec LP |
1054 | return 0; |
1055 | } | |
1056 | ||
73e231ab | 1057 | /* Otherwise, treat it as cg spec */ |
b69d29ce LP |
1058 | r = cg_split_spec(path, &c, &p); |
1059 | if (r < 0) | |
35d2e7ec LP |
1060 | return r; |
1061 | ||
78edb35a | 1062 | return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); |
35d2e7ec | 1063 | } |
1f73f0f1 | 1064 | |
7027ff61 | 1065 | int cg_get_root_path(char **path) { |
9444b1f2 | 1066 | char *p, *e; |
7027ff61 LP |
1067 | int r; |
1068 | ||
1069 | assert(path); | |
1070 | ||
9444b1f2 | 1071 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1072 | if (r < 0) |
1073 | return r; | |
1074 | ||
9444b1f2 LP |
1075 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); |
1076 | if (e) | |
7027ff61 LP |
1077 | *e = 0; |
1078 | ||
1f73f0f1 LP |
1079 | *path = p; |
1080 | return 0; | |
1081 | } | |
b59e2465 | 1082 | |
751bc6ac LP |
1083 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
1084 | _cleanup_free_ char *rt = NULL; | |
1085 | char *p; | |
ba1261bc LP |
1086 | int r; |
1087 | ||
e9174f29 | 1088 | assert(cgroup); |
751bc6ac | 1089 | assert(shifted); |
e9174f29 LP |
1090 | |
1091 | if (!root) { | |
1092 | /* If the root was specified let's use that, otherwise | |
1093 | * let's determine it from PID 1 */ | |
1094 | ||
751bc6ac | 1095 | r = cg_get_root_path(&rt); |
e9174f29 LP |
1096 | if (r < 0) |
1097 | return r; | |
1098 | ||
751bc6ac | 1099 | root = rt; |
e9174f29 | 1100 | } |
ba1261bc | 1101 | |
751bc6ac LP |
1102 | p = path_startswith(cgroup, root); |
1103 | if (p) | |
1104 | *shifted = p - 1; | |
1105 | else | |
1106 | *shifted = cgroup; | |
1107 | ||
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { | |
1112 | _cleanup_free_ char *raw = NULL; | |
1113 | const char *c; | |
1114 | int r; | |
1115 | ||
1116 | assert(pid >= 0); | |
1117 | assert(cgroup); | |
1118 | ||
1119 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
7027ff61 | 1120 | if (r < 0) |
ba1261bc | 1121 | return r; |
ba1261bc | 1122 | |
751bc6ac LP |
1123 | r = cg_shift_path(raw, root, &c); |
1124 | if (r < 0) | |
1125 | return r; | |
ba1261bc | 1126 | |
751bc6ac LP |
1127 | if (c == raw) { |
1128 | *cgroup = raw; | |
1129 | raw = NULL; | |
1130 | } else { | |
1131 | char *n; | |
ba1261bc | 1132 | |
751bc6ac LP |
1133 | n = strdup(c); |
1134 | if (!n) | |
ba1261bc | 1135 | return -ENOMEM; |
ba1261bc | 1136 | |
751bc6ac LP |
1137 | *cgroup = n; |
1138 | } | |
ba1261bc LP |
1139 | |
1140 | return 0; | |
1141 | } | |
1142 | ||
7027ff61 | 1143 | int cg_path_decode_unit(const char *cgroup, char **unit){ |
8b0849e9 LP |
1144 | char *c, *s; |
1145 | size_t n; | |
ef1673d1 MT |
1146 | |
1147 | assert(cgroup); | |
6c03089c | 1148 | assert(unit); |
ef1673d1 | 1149 | |
8b0849e9 LP |
1150 | n = strcspn(cgroup, "/"); |
1151 | if (n < 3) | |
1152 | return -ENXIO; | |
1153 | ||
1154 | c = strndupa(cgroup, n); | |
ae018d9b | 1155 | c = cg_unescape(c); |
ef1673d1 | 1156 | |
7410616c | 1157 | if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) |
cfeaa44a | 1158 | return -ENXIO; |
ef1673d1 | 1159 | |
d7bd3de0 | 1160 | s = strdup(c); |
6c03089c LP |
1161 | if (!s) |
1162 | return -ENOMEM; | |
1163 | ||
1164 | *unit = s; | |
ef1673d1 MT |
1165 | return 0; |
1166 | } | |
1167 | ||
8b0849e9 LP |
1168 | static bool valid_slice_name(const char *p, size_t n) { |
1169 | ||
1170 | if (!p) | |
1171 | return false; | |
1172 | ||
1173 | if (n < strlen("x.slice")) | |
1174 | return false; | |
1175 | ||
1176 | if (memcmp(p + n - 6, ".slice", 6) == 0) { | |
1177 | char buf[n+1], *c; | |
1178 | ||
1179 | memcpy(buf, p, n); | |
1180 | buf[n] = 0; | |
1181 | ||
1182 | c = cg_unescape(buf); | |
1183 | ||
7410616c | 1184 | return unit_name_is_valid(c, UNIT_NAME_PLAIN); |
8b0849e9 LP |
1185 | } |
1186 | ||
1187 | return false; | |
1188 | } | |
1189 | ||
9444b1f2 | 1190 | static const char *skip_slices(const char *p) { |
8b0849e9 LP |
1191 | assert(p); |
1192 | ||
9444b1f2 LP |
1193 | /* Skips over all slice assignments */ |
1194 | ||
1195 | for (;;) { | |
1021b21b LP |
1196 | size_t n; |
1197 | ||
9444b1f2 LP |
1198 | p += strspn(p, "/"); |
1199 | ||
1200 | n = strcspn(p, "/"); | |
8b0849e9 | 1201 | if (!valid_slice_name(p, n)) |
9444b1f2 LP |
1202 | return p; |
1203 | ||
1204 | p += n; | |
1205 | } | |
1206 | } | |
1207 | ||
8b0849e9 | 1208 | int cg_path_get_unit(const char *path, char **ret) { |
6c03089c | 1209 | const char *e; |
8b0849e9 LP |
1210 | char *unit; |
1211 | int r; | |
6c03089c LP |
1212 | |
1213 | assert(path); | |
8b0849e9 | 1214 | assert(ret); |
6c03089c | 1215 | |
9444b1f2 | 1216 | e = skip_slices(path); |
6c03089c | 1217 | |
8b0849e9 LP |
1218 | r = cg_path_decode_unit(e, &unit); |
1219 | if (r < 0) | |
1220 | return r; | |
1221 | ||
1222 | /* We skipped over the slices, don't accept any now */ | |
1223 | if (endswith(unit, ".slice")) { | |
1224 | free(unit); | |
1225 | return -ENXIO; | |
1226 | } | |
1227 | ||
1228 | *ret = unit; | |
1229 | return 0; | |
6c03089c LP |
1230 | } |
1231 | ||
1232 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
7fd1b19b | 1233 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1234 | int r; |
ba1261bc | 1235 | |
ef1673d1 MT |
1236 | assert(unit); |
1237 | ||
7027ff61 | 1238 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1239 | if (r < 0) |
1240 | return r; | |
1241 | ||
6c03089c LP |
1242 | return cg_path_get_unit(cgroup, unit); |
1243 | } | |
ef1673d1 | 1244 | |
d4fffc4b ZJS |
1245 | /** |
1246 | * Skip session-*.scope, but require it to be there. | |
1247 | */ | |
9444b1f2 LP |
1248 | static const char *skip_session(const char *p) { |
1249 | size_t n; | |
1250 | ||
8b0849e9 LP |
1251 | if (isempty(p)) |
1252 | return NULL; | |
9444b1f2 LP |
1253 | |
1254 | p += strspn(p, "/"); | |
1255 | ||
1256 | n = strcspn(p, "/"); | |
8b0849e9 | 1257 | if (n < strlen("session-x.scope")) |
d4fffc4b ZJS |
1258 | return NULL; |
1259 | ||
8b0849e9 LP |
1260 | if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { |
1261 | char buf[n - 8 - 6 + 1]; | |
1262 | ||
1263 | memcpy(buf, p + 8, n - 8 - 6); | |
1264 | buf[n - 8 - 6] = 0; | |
d4fffc4b | 1265 | |
8b0849e9 LP |
1266 | /* Note that session scopes never need unescaping, |
1267 | * since they cannot conflict with the kernel's own | |
1268 | * names, hence we don't need to call cg_unescape() | |
1269 | * here. */ | |
1270 | ||
1271 | if (!session_id_valid(buf)) | |
1272 | return false; | |
1273 | ||
1274 | p += n; | |
1275 | p += strspn(p, "/"); | |
1276 | return p; | |
1277 | } | |
1278 | ||
1279 | return NULL; | |
d4fffc4b ZJS |
1280 | } |
1281 | ||
1282 | /** | |
1283 | * Skip user@*.service, but require it to be there. | |
1284 | */ | |
1285 | static const char *skip_user_manager(const char *p) { | |
1286 | size_t n; | |
1287 | ||
8b0849e9 LP |
1288 | if (isempty(p)) |
1289 | return NULL; | |
d4fffc4b ZJS |
1290 | |
1291 | p += strspn(p, "/"); | |
1292 | ||
1293 | n = strcspn(p, "/"); | |
8b0849e9 | 1294 | if (n < strlen("user@x.service")) |
6c03089c | 1295 | return NULL; |
ef1673d1 | 1296 | |
8b0849e9 LP |
1297 | if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { |
1298 | char buf[n - 5 - 8 + 1]; | |
9444b1f2 | 1299 | |
8b0849e9 LP |
1300 | memcpy(buf, p + 5, n - 5 - 8); |
1301 | buf[n - 5 - 8] = 0; | |
1302 | ||
1303 | /* Note that user manager services never need unescaping, | |
1304 | * since they cannot conflict with the kernel's own | |
1305 | * names, hence we don't need to call cg_unescape() | |
1306 | * here. */ | |
1307 | ||
1308 | if (parse_uid(buf, NULL) < 0) | |
1309 | return NULL; | |
1310 | ||
1311 | p += n; | |
1312 | p += strspn(p, "/"); | |
1313 | ||
1314 | return p; | |
1315 | } | |
1316 | ||
1317 | return NULL; | |
9444b1f2 LP |
1318 | } |
1319 | ||
329ac4bc | 1320 | static const char *skip_user_prefix(const char *path) { |
d4fffc4b | 1321 | const char *e, *t; |
ef1673d1 | 1322 | |
6c03089c | 1323 | assert(path); |
ba1261bc | 1324 | |
9444b1f2 LP |
1325 | /* Skip slices, if there are any */ |
1326 | e = skip_slices(path); | |
ba1261bc | 1327 | |
329ac4bc | 1328 | /* Skip the user manager, if it's in the path now... */ |
8b0849e9 | 1329 | t = skip_user_manager(e); |
329ac4bc LP |
1330 | if (t) |
1331 | return t; | |
8b0849e9 | 1332 | |
329ac4bc LP |
1333 | /* Alternatively skip the user session if it is in the path... */ |
1334 | return skip_session(e); | |
1335 | } | |
32081481 | 1336 | |
329ac4bc LP |
1337 | int cg_path_get_user_unit(const char *path, char **ret) { |
1338 | const char *t; | |
6c03089c | 1339 | |
329ac4bc LP |
1340 | assert(path); |
1341 | assert(ret); | |
8b0849e9 | 1342 | |
329ac4bc LP |
1343 | t = skip_user_prefix(path); |
1344 | if (!t) | |
8b0849e9 | 1345 | return -ENXIO; |
8b0849e9 | 1346 | |
329ac4bc LP |
1347 | /* And from here on it looks pretty much the same as for a |
1348 | * system unit, hence let's use the same parser from here | |
1349 | * on. */ | |
1350 | return cg_path_get_unit(t, ret); | |
ef1673d1 | 1351 | } |
ba1261bc | 1352 | |
ef1673d1 | 1353 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
7fd1b19b | 1354 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1355 | int r; |
1356 | ||
1357 | assert(unit); | |
1358 | ||
7027ff61 | 1359 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1360 | if (r < 0) |
1361 | return r; | |
1362 | ||
1363 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1364 | } |
e884315e | 1365 | |
7027ff61 | 1366 | int cg_path_get_machine_name(const char *path, char **machine) { |
89f7c846 LP |
1367 | _cleanup_free_ char *u = NULL, *sl = NULL; |
1368 | int r; | |
374ec6ab | 1369 | |
89f7c846 LP |
1370 | r = cg_path_get_unit(path, &u); |
1371 | if (r < 0) | |
1372 | return r; | |
7027ff61 | 1373 | |
89f7c846 LP |
1374 | sl = strjoin("/run/systemd/machines/unit:", u, NULL); |
1375 | if (!sl) | |
ae018d9b | 1376 | return -ENOMEM; |
aff38e74 | 1377 | |
89f7c846 | 1378 | return readlink_malloc(sl, machine); |
7027ff61 LP |
1379 | } |
1380 | ||
1381 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
7fd1b19b | 1382 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1383 | int r; |
1384 | ||
1385 | assert(machine); | |
1386 | ||
1387 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1388 | if (r < 0) | |
1389 | return r; | |
1390 | ||
1391 | return cg_path_get_machine_name(cgroup, machine); | |
1392 | } | |
1393 | ||
1394 | int cg_path_get_session(const char *path, char **session) { | |
8b0849e9 LP |
1395 | _cleanup_free_ char *unit = NULL; |
1396 | char *start, *end; | |
1397 | int r; | |
7027ff61 LP |
1398 | |
1399 | assert(path); | |
7027ff61 | 1400 | |
8b0849e9 LP |
1401 | r = cg_path_get_unit(path, &unit); |
1402 | if (r < 0) | |
1403 | return r; | |
7027ff61 | 1404 | |
8b0849e9 LP |
1405 | start = startswith(unit, "session-"); |
1406 | if (!start) | |
cfeaa44a | 1407 | return -ENXIO; |
8b0849e9 LP |
1408 | end = endswith(start, ".scope"); |
1409 | if (!end) | |
cfeaa44a | 1410 | return -ENXIO; |
8b0849e9 LP |
1411 | |
1412 | *end = 0; | |
1413 | if (!session_id_valid(start)) | |
cfeaa44a | 1414 | return -ENXIO; |
374ec6ab | 1415 | |
af08d2f9 | 1416 | if (session) { |
8b0849e9 | 1417 | char *rr; |
af08d2f9 | 1418 | |
8b0849e9 LP |
1419 | rr = strdup(start); |
1420 | if (!rr) | |
af08d2f9 LP |
1421 | return -ENOMEM; |
1422 | ||
8b0849e9 | 1423 | *session = rr; |
af08d2f9 | 1424 | } |
7027ff61 | 1425 | |
7027ff61 LP |
1426 | return 0; |
1427 | } | |
1428 | ||
1429 | int cg_pid_get_session(pid_t pid, char **session) { | |
7fd1b19b | 1430 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1431 | int r; |
1432 | ||
7027ff61 LP |
1433 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1434 | if (r < 0) | |
1435 | return r; | |
1436 | ||
1437 | return cg_path_get_session(cgroup, session); | |
1438 | } | |
1439 | ||
ae018d9b | 1440 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
374ec6ab | 1441 | _cleanup_free_ char *slice = NULL; |
8b0849e9 | 1442 | char *start, *end; |
374ec6ab | 1443 | int r; |
ae018d9b LP |
1444 | |
1445 | assert(path); | |
ae018d9b | 1446 | |
374ec6ab LP |
1447 | r = cg_path_get_slice(path, &slice); |
1448 | if (r < 0) | |
1449 | return r; | |
ae018d9b | 1450 | |
674eb685 LP |
1451 | start = startswith(slice, "user-"); |
1452 | if (!start) | |
cfeaa44a | 1453 | return -ENXIO; |
8b0849e9 | 1454 | end = endswith(start, ".slice"); |
674eb685 | 1455 | if (!end) |
cfeaa44a | 1456 | return -ENXIO; |
ae018d9b | 1457 | |
8b0849e9 LP |
1458 | *end = 0; |
1459 | if (parse_uid(start, uid) < 0) | |
cfeaa44a | 1460 | return -ENXIO; |
674eb685 | 1461 | |
674eb685 | 1462 | return 0; |
ae018d9b LP |
1463 | } |
1464 | ||
1465 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1466 | _cleanup_free_ char *cgroup = NULL; | |
1467 | int r; | |
1468 | ||
ae018d9b LP |
1469 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1470 | if (r < 0) | |
1471 | return r; | |
1472 | ||
1473 | return cg_path_get_owner_uid(cgroup, uid); | |
1474 | } | |
1475 | ||
1021b21b LP |
1476 | int cg_path_get_slice(const char *p, char **slice) { |
1477 | const char *e = NULL; | |
1021b21b LP |
1478 | |
1479 | assert(p); | |
1480 | assert(slice); | |
1481 | ||
329ac4bc LP |
1482 | /* Finds the right-most slice unit from the beginning, but |
1483 | * stops before we come to the first non-slice unit. */ | |
1484 | ||
1021b21b LP |
1485 | for (;;) { |
1486 | size_t n; | |
1487 | ||
1488 | p += strspn(p, "/"); | |
1489 | ||
1490 | n = strcspn(p, "/"); | |
8b0849e9 | 1491 | if (!valid_slice_name(p, n)) { |
1021b21b | 1492 | |
8b0849e9 LP |
1493 | if (!e) { |
1494 | char *s; | |
1021b21b | 1495 | |
8b0849e9 LP |
1496 | s = strdup("-.slice"); |
1497 | if (!s) | |
1498 | return -ENOMEM; | |
1021b21b | 1499 | |
8b0849e9 LP |
1500 | *slice = s; |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | return cg_path_decode_unit(e, slice); | |
1021b21b LP |
1505 | } |
1506 | ||
1507 | e = p; | |
1021b21b LP |
1508 | p += n; |
1509 | } | |
1510 | } | |
1511 | ||
1512 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1513 | _cleanup_free_ char *cgroup = NULL; | |
1514 | int r; | |
1515 | ||
1516 | assert(slice); | |
1517 | ||
1518 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1519 | if (r < 0) | |
1520 | return r; | |
1521 | ||
1522 | return cg_path_get_slice(cgroup, slice); | |
1523 | } | |
1524 | ||
329ac4bc LP |
1525 | int cg_path_get_user_slice(const char *p, char **slice) { |
1526 | const char *t; | |
1527 | assert(p); | |
1528 | assert(slice); | |
1529 | ||
1530 | t = skip_user_prefix(p); | |
1531 | if (!t) | |
1532 | return -ENXIO; | |
1533 | ||
1534 | /* And now it looks pretty much the same as for a system | |
1535 | * slice, so let's just use the same parser from here on. */ | |
1536 | return cg_path_get_slice(t, slice); | |
1537 | } | |
1538 | ||
1539 | int cg_pid_get_user_slice(pid_t pid, char **slice) { | |
1540 | _cleanup_free_ char *cgroup = NULL; | |
1541 | int r; | |
1542 | ||
1543 | assert(slice); | |
1544 | ||
1545 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1546 | if (r < 0) | |
1547 | return r; | |
1548 | ||
1549 | return cg_path_get_user_slice(cgroup, slice); | |
1550 | } | |
1551 | ||
ae018d9b LP |
1552 | char *cg_escape(const char *p) { |
1553 | bool need_prefix = false; | |
1554 | ||
1555 | /* This implements very minimal escaping for names to be used | |
1556 | * as file names in the cgroup tree: any name which might | |
1557 | * conflict with a kernel name or is prefixed with '_' is | |
1558 | * prefixed with a '_'. That way, when reading cgroup names it | |
1559 | * is sufficient to remove a single prefixing underscore if | |
1560 | * there is one. */ | |
1561 | ||
1562 | /* The return value of this function (unlike cg_unescape()) | |
1563 | * needs free()! */ | |
1564 | ||
a0ab5665 LP |
1565 | if (p[0] == 0 || |
1566 | p[0] == '_' || | |
1567 | p[0] == '.' || | |
1568 | streq(p, "notify_on_release") || | |
1569 | streq(p, "release_agent") || | |
1570 | streq(p, "tasks")) | |
ae018d9b LP |
1571 | need_prefix = true; |
1572 | else { | |
1573 | const char *dot; | |
1574 | ||
1575 | dot = strrchr(p, '.'); | |
1576 | if (dot) { | |
1577 | ||
1578 | if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0) | |
1579 | need_prefix = true; | |
1580 | else { | |
1581 | char *n; | |
1582 | ||
1583 | n = strndupa(p, dot - p); | |
1584 | ||
1585 | if (check_hierarchy(n) >= 0) | |
1586 | need_prefix = true; | |
1587 | } | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | if (need_prefix) | |
1592 | return strappend("_", p); | |
1593 | else | |
1594 | return strdup(p); | |
1595 | } | |
1596 | ||
1597 | char *cg_unescape(const char *p) { | |
1598 | assert(p); | |
1599 | ||
1600 | /* The return value of this function (unlike cg_escape()) | |
1601 | * doesn't need free()! */ | |
1602 | ||
1603 | if (p[0] == '_') | |
1604 | return (char*) p+1; | |
1605 | ||
1606 | return (char*) p; | |
1607 | } | |
78edb35a LP |
1608 | |
1609 | #define CONTROLLER_VALID \ | |
4b549144 | 1610 | DIGITS LETTERS \ |
78edb35a LP |
1611 | "_" |
1612 | ||
1613 | bool cg_controller_is_valid(const char *p, bool allow_named) { | |
1614 | const char *t, *s; | |
1615 | ||
1616 | if (!p) | |
1617 | return false; | |
1618 | ||
1619 | if (allow_named) { | |
1620 | s = startswith(p, "name="); | |
1621 | if (s) | |
1622 | p = s; | |
1623 | } | |
1624 | ||
1625 | if (*p == 0 || *p == '_') | |
1626 | return false; | |
1627 | ||
1628 | for (t = p; *t; t++) | |
1629 | if (!strchr(CONTROLLER_VALID, *t)) | |
1630 | return false; | |
1631 | ||
1632 | if (t - p > FILENAME_MAX) | |
1633 | return false; | |
1634 | ||
1635 | return true; | |
1636 | } | |
a016b922 LP |
1637 | |
1638 | int cg_slice_to_path(const char *unit, char **ret) { | |
1639 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1640 | const char *dash; | |
7410616c | 1641 | int r; |
a016b922 LP |
1642 | |
1643 | assert(unit); | |
1644 | assert(ret); | |
1645 | ||
c96cc582 LP |
1646 | if (streq(unit, "-.slice")) { |
1647 | char *x; | |
1648 | ||
1649 | x = strdup(""); | |
1650 | if (!x) | |
1651 | return -ENOMEM; | |
1652 | *ret = x; | |
1653 | return 0; | |
1654 | } | |
1655 | ||
7410616c | 1656 | if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) |
a016b922 LP |
1657 | return -EINVAL; |
1658 | ||
1659 | if (!endswith(unit, ".slice")) | |
1660 | return -EINVAL; | |
1661 | ||
7410616c LP |
1662 | r = unit_name_to_prefix(unit, &p); |
1663 | if (r < 0) | |
1664 | return r; | |
a016b922 LP |
1665 | |
1666 | dash = strchr(p, '-'); | |
e66e5b61 LP |
1667 | |
1668 | /* Don't allow initial dashes */ | |
1669 | if (dash == p) | |
1670 | return -EINVAL; | |
1671 | ||
a016b922 LP |
1672 | while (dash) { |
1673 | _cleanup_free_ char *escaped = NULL; | |
1674 | char n[dash - p + sizeof(".slice")]; | |
1675 | ||
e66e5b61 LP |
1676 | /* Don't allow trailing or double dashes */ |
1677 | if (dash[1] == 0 || dash[1] == '-') | |
c96cc582 | 1678 | return -EINVAL; |
a016b922 | 1679 | |
c96cc582 | 1680 | strcpy(stpncpy(n, p, dash - p), ".slice"); |
7410616c | 1681 | if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) |
a016b922 LP |
1682 | return -EINVAL; |
1683 | ||
1684 | escaped = cg_escape(n); | |
1685 | if (!escaped) | |
1686 | return -ENOMEM; | |
1687 | ||
1688 | if (!strextend(&s, escaped, "/", NULL)) | |
1689 | return -ENOMEM; | |
1690 | ||
1691 | dash = strchr(dash+1, '-'); | |
1692 | } | |
1693 | ||
1694 | e = cg_escape(unit); | |
1695 | if (!e) | |
1696 | return -ENOMEM; | |
1697 | ||
1698 | if (!strextend(&s, e, NULL)) | |
1699 | return -ENOMEM; | |
1700 | ||
1701 | *ret = s; | |
1702 | s = NULL; | |
1703 | ||
1704 | return 0; | |
1705 | } | |
4ad49000 LP |
1706 | |
1707 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
1708 | _cleanup_free_ char *p = NULL; | |
1709 | int r; | |
1710 | ||
1711 | r = cg_get_path(controller, path, attribute, &p); | |
1712 | if (r < 0) | |
1713 | return r; | |
1714 | ||
70c949a4 | 1715 | return write_string_file_no_create(p, value); |
4ad49000 LP |
1716 | } |
1717 | ||
934277fe LP |
1718 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
1719 | _cleanup_free_ char *p = NULL; | |
1720 | int r; | |
1721 | ||
1722 | r = cg_get_path(controller, path, attribute, &p); | |
1723 | if (r < 0) | |
1724 | return r; | |
1725 | ||
1726 | return read_one_line_file(p, ret); | |
1727 | } | |
1728 | ||
4ad49000 LP |
1729 | static const char mask_names[] = |
1730 | "cpu\0" | |
1731 | "cpuacct\0" | |
1732 | "blkio\0" | |
1733 | "memory\0" | |
1734 | "devices\0"; | |
1735 | ||
13b84ec7 | 1736 | int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) { |
4ad49000 LP |
1737 | CGroupControllerMask bit = 1; |
1738 | const char *n; | |
1739 | int r; | |
1740 | ||
1741 | /* This one will create a cgroup in our private tree, but also | |
1742 | * duplicate it in the trees specified in mask, and remove it | |
1743 | * in all others */ | |
1744 | ||
1745 | /* First create the cgroup in our own hierarchy. */ | |
1746 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
1747 | if (r < 0) | |
1748 | return r; | |
1749 | ||
1750 | /* Then, do the same in the other hierarchies */ | |
1751 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 | 1752 | if (mask & bit) |
4ad49000 | 1753 | cg_create(n, path); |
13b84ec7 | 1754 | else if (supported & bit) |
4ad49000 LP |
1755 | cg_trim(n, path, true); |
1756 | ||
1757 | bit <<= 1; | |
1758 | } | |
1759 | ||
13b84ec7 | 1760 | return 0; |
4ad49000 LP |
1761 | } |
1762 | ||
7b3fd631 | 1763 | int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { |
4ad49000 LP |
1764 | CGroupControllerMask bit = 1; |
1765 | const char *n; | |
1766 | int r; | |
1767 | ||
1768 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
13b84ec7 LP |
1769 | if (r < 0) |
1770 | return r; | |
4ad49000 LP |
1771 | |
1772 | NULSTR_FOREACH(n, mask_names) { | |
7b3fd631 LP |
1773 | |
1774 | if (supported & bit) { | |
1775 | const char *p = NULL; | |
1776 | ||
1777 | if (path_callback) | |
1778 | p = path_callback(bit, userdata); | |
1779 | ||
1780 | if (!p) | |
1781 | p = path; | |
1782 | ||
13b84ec7 | 1783 | cg_attach_fallback(n, path, pid); |
7b3fd631 | 1784 | } |
4ad49000 LP |
1785 | |
1786 | bit <<= 1; | |
1787 | } | |
1788 | ||
13b84ec7 | 1789 | return 0; |
4ad49000 LP |
1790 | } |
1791 | ||
7b3fd631 | 1792 | int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { |
6c12b52e LP |
1793 | Iterator i; |
1794 | void *pidp; | |
1795 | int r = 0; | |
1796 | ||
1797 | SET_FOREACH(pidp, pids, i) { | |
1798 | pid_t pid = PTR_TO_LONG(pidp); | |
13b84ec7 | 1799 | int q; |
6c12b52e | 1800 | |
7b3fd631 | 1801 | q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); |
13b84ec7 LP |
1802 | if (q < 0) |
1803 | r = q; | |
6c12b52e LP |
1804 | } |
1805 | ||
1806 | return r; | |
1807 | } | |
1808 | ||
03b90d4b | 1809 | int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
4ad49000 LP |
1810 | CGroupControllerMask bit = 1; |
1811 | const char *n; | |
1812 | int r; | |
1813 | ||
13b84ec7 LP |
1814 | if (!path_equal(from, to)) { |
1815 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true); | |
1816 | if (r < 0) | |
1817 | return r; | |
1818 | } | |
4ad49000 LP |
1819 | |
1820 | NULSTR_FOREACH(n, mask_names) { | |
03b90d4b LP |
1821 | if (supported & bit) { |
1822 | const char *p = NULL; | |
1823 | ||
1824 | if (to_callback) | |
1825 | p = to_callback(bit, userdata); | |
1826 | ||
1827 | if (!p) | |
1828 | p = to; | |
1829 | ||
1830 | cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false); | |
1831 | } | |
4ad49000 LP |
1832 | |
1833 | bit <<= 1; | |
1834 | } | |
1835 | ||
13b84ec7 | 1836 | return 0; |
4ad49000 LP |
1837 | } |
1838 | ||
13b84ec7 | 1839 | int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) { |
4ad49000 LP |
1840 | CGroupControllerMask bit = 1; |
1841 | const char *n; | |
1842 | int r; | |
1843 | ||
1844 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
1845 | if (r < 0) | |
1846 | return r; | |
1847 | ||
1848 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 | 1849 | if (supported & bit) |
4ad49000 LP |
1850 | cg_trim(n, path, delete_root); |
1851 | ||
1852 | bit <<= 1; | |
1853 | } | |
1854 | ||
13b84ec7 | 1855 | return 0; |
4ad49000 LP |
1856 | } |
1857 | ||
1858 | CGroupControllerMask cg_mask_supported(void) { | |
1859 | CGroupControllerMask bit = 1, mask = 0; | |
1860 | const char *n; | |
1861 | ||
1862 | NULSTR_FOREACH(n, mask_names) { | |
1863 | if (check_hierarchy(n) >= 0) | |
1864 | mask |= bit; | |
1865 | ||
1866 | bit <<= 1; | |
1867 | } | |
1868 | ||
1869 | return mask; | |
1870 | } | |
b12afc8c LP |
1871 | |
1872 | int cg_kernel_controllers(Set *controllers) { | |
1873 | _cleanup_fclose_ FILE *f = NULL; | |
1874 | char buf[LINE_MAX]; | |
1875 | int r; | |
1876 | ||
1877 | assert(controllers); | |
1878 | ||
1879 | f = fopen("/proc/cgroups", "re"); | |
1880 | if (!f) { | |
1881 | if (errno == ENOENT) | |
1882 | return 0; | |
1883 | return -errno; | |
1884 | } | |
1885 | ||
1886 | /* Ignore the header line */ | |
1887 | (void) fgets(buf, sizeof(buf), f); | |
1888 | ||
1889 | for (;;) { | |
1890 | char *controller; | |
1891 | int enabled = 0; | |
1892 | ||
1893 | errno = 0; | |
1894 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { | |
1895 | ||
1896 | if (feof(f)) | |
1897 | break; | |
1898 | ||
1899 | if (ferror(f) && errno) | |
1900 | return -errno; | |
1901 | ||
1902 | return -EBADMSG; | |
1903 | } | |
1904 | ||
1905 | if (!enabled) { | |
1906 | free(controller); | |
1907 | continue; | |
1908 | } | |
1909 | ||
1910 | if (!filename_is_valid(controller)) { | |
1911 | free(controller); | |
1912 | return -EBADMSG; | |
1913 | } | |
1914 | ||
1915 | r = set_consume(controllers, controller); | |
1916 | if (r < 0) | |
1917 | return r; | |
1918 | } | |
1919 | ||
1920 | return 0; | |
1921 | } |