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Commit | Line | Data |
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8c6db833 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
8c6db833 LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
8c6db833 | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
8c6db833 LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
84ac7bea | 20 | #include <dirent.h> |
8c6db833 | 21 | #include <errno.h> |
84ac7bea | 22 | #include <ftw.h> |
11c3a366 | 23 | #include <limits.h> |
8c6db833 | 24 | #include <signal.h> |
11c3a366 | 25 | #include <stddef.h> |
8c6db833 | 26 | #include <stdlib.h> |
84ac7bea | 27 | #include <string.h> |
672c48cc | 28 | #include <sys/stat.h> |
11c3a366 | 29 | #include <sys/statfs.h> |
672c48cc | 30 | #include <sys/types.h> |
4b58153d | 31 | #include <sys/xattr.h> |
84ac7bea | 32 | #include <unistd.h> |
8c6db833 | 33 | |
b5efdb8a | 34 | #include "alloc-util.h" |
3ffd4af2 | 35 | #include "cgroup-util.h" |
93cc7779 | 36 | #include "def.h" |
a0956174 | 37 | #include "dirent-util.h" |
84ac7bea | 38 | #include "extract-word.h" |
3ffd4af2 | 39 | #include "fd-util.h" |
84ac7bea | 40 | #include "fileio.h" |
f97b34a6 | 41 | #include "format-util.h" |
f4f15635 | 42 | #include "fs-util.h" |
93cc7779 | 43 | #include "log.h" |
84ac7bea LP |
44 | #include "login-util.h" |
45 | #include "macro.h" | |
93cc7779 | 46 | #include "missing.h" |
84ac7bea | 47 | #include "mkdir.h" |
6bedfcbb | 48 | #include "parse-util.h" |
9eb977db | 49 | #include "path-util.h" |
872a590e | 50 | #include "proc-cmdline.h" |
84ac7bea LP |
51 | #include "process-util.h" |
52 | #include "set.h" | |
9444b1f2 | 53 | #include "special.h" |
872a590e | 54 | #include "stat-util.h" |
d054f0a4 | 55 | #include "stdio-util.h" |
8b43440b | 56 | #include "string-table.h" |
07630cea | 57 | #include "string-util.h" |
84ac7bea | 58 | #include "unit-name.h" |
b1d4f8e1 | 59 | #include "user-util.h" |
8c6db833 | 60 | |
c6c18be3 | 61 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
7027ff61 | 62 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 63 | FILE *f; |
7027ff61 | 64 | int r; |
c6c18be3 | 65 | |
c6c18be3 LP |
66 | assert(_f); |
67 | ||
c3175a7f LP |
68 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
69 | if (r < 0) | |
c6c18be3 LP |
70 | return r; |
71 | ||
72 | f = fopen(fs, "re"); | |
c6c18be3 LP |
73 | if (!f) |
74 | return -errno; | |
75 | ||
76 | *_f = f; | |
77 | return 0; | |
78 | } | |
79 | ||
c6c18be3 LP |
80 | int cg_read_pid(FILE *f, pid_t *_pid) { |
81 | unsigned long ul; | |
82 | ||
83 | /* Note that the cgroup.procs might contain duplicates! See | |
84 | * cgroups.txt for details. */ | |
85 | ||
7027ff61 LP |
86 | assert(f); |
87 | assert(_pid); | |
88 | ||
c6c18be3 LP |
89 | errno = 0; |
90 | if (fscanf(f, "%lu", &ul) != 1) { | |
91 | ||
92 | if (feof(f)) | |
93 | return 0; | |
94 | ||
f5e5c28f | 95 | return errno > 0 ? -errno : -EIO; |
c6c18be3 LP |
96 | } |
97 | ||
98 | if (ul <= 0) | |
99 | return -EIO; | |
100 | ||
101 | *_pid = (pid_t) ul; | |
102 | return 1; | |
103 | } | |
104 | ||
ab2c3861 TH |
105 | int cg_read_event(const char *controller, const char *path, const char *event, |
106 | char **val) | |
107 | { | |
108 | _cleanup_free_ char *events = NULL, *content = NULL; | |
109 | char *p, *line; | |
110 | int r; | |
111 | ||
112 | r = cg_get_path(controller, path, "cgroup.events", &events); | |
113 | if (r < 0) | |
114 | return r; | |
115 | ||
116 | r = read_full_file(events, &content, NULL); | |
117 | if (r < 0) | |
118 | return r; | |
119 | ||
120 | p = content; | |
121 | while ((line = strsep(&p, "\n"))) { | |
122 | char *key; | |
123 | ||
124 | key = strsep(&line, " "); | |
125 | if (!key || !line) | |
126 | return -EINVAL; | |
127 | ||
128 | if (strcmp(key, event)) | |
129 | continue; | |
130 | ||
131 | *val = strdup(line); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | return -ENOENT; | |
136 | } | |
137 | ||
3228995c CB |
138 | bool cg_ns_supported(void) { |
139 | static thread_local int enabled = -1; | |
140 | ||
141 | if (enabled >= 0) | |
142 | return enabled; | |
143 | ||
144 | if (access("/proc/self/ns/cgroup", F_OK) == 0) | |
145 | enabled = 1; | |
146 | else | |
147 | enabled = 0; | |
148 | ||
149 | return enabled; | |
150 | } | |
151 | ||
35d2e7ec | 152 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
7027ff61 | 153 | _cleanup_free_ char *fs = NULL; |
35d2e7ec LP |
154 | int r; |
155 | DIR *d; | |
156 | ||
35d2e7ec LP |
157 | assert(_d); |
158 | ||
159 | /* This is not recursive! */ | |
160 | ||
c3175a7f LP |
161 | r = cg_get_path(controller, path, NULL, &fs); |
162 | if (r < 0) | |
35d2e7ec LP |
163 | return r; |
164 | ||
165 | d = opendir(fs); | |
35d2e7ec LP |
166 | if (!d) |
167 | return -errno; | |
168 | ||
169 | *_d = d; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | int cg_read_subgroup(DIR *d, char **fn) { | |
174 | struct dirent *de; | |
175 | ||
176 | assert(d); | |
7027ff61 | 177 | assert(fn); |
35d2e7ec | 178 | |
f01327ad | 179 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
35d2e7ec LP |
180 | char *b; |
181 | ||
182 | if (de->d_type != DT_DIR) | |
183 | continue; | |
184 | ||
49bfc877 | 185 | if (dot_or_dot_dot(de->d_name)) |
35d2e7ec LP |
186 | continue; |
187 | ||
7027ff61 LP |
188 | b = strdup(de->d_name); |
189 | if (!b) | |
35d2e7ec LP |
190 | return -ENOMEM; |
191 | ||
192 | *fn = b; | |
193 | return 1; | |
194 | } | |
195 | ||
35d2e7ec LP |
196 | return 0; |
197 | } | |
198 | ||
4ad49000 | 199 | int cg_rmdir(const char *controller, const char *path) { |
7027ff61 | 200 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
201 | int r; |
202 | ||
ad293f5a LP |
203 | r = cg_get_path(controller, path, NULL, &p); |
204 | if (r < 0) | |
35d2e7ec LP |
205 | return r; |
206 | ||
207 | r = rmdir(p); | |
7027ff61 LP |
208 | if (r < 0 && errno != ENOENT) |
209 | return -errno; | |
35d2e7ec | 210 | |
7027ff61 | 211 | return 0; |
35d2e7ec LP |
212 | } |
213 | ||
1d98fef1 LP |
214 | int cg_kill( |
215 | const char *controller, | |
216 | const char *path, | |
217 | int sig, | |
218 | CGroupFlags flags, | |
219 | Set *s, | |
220 | cg_kill_log_func_t log_kill, | |
221 | void *userdata) { | |
222 | ||
7027ff61 | 223 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 224 | bool done = false; |
8c6db833 | 225 | int r, ret = 0; |
35d2e7ec | 226 | pid_t my_pid; |
8c6db833 | 227 | |
8c6db833 LP |
228 | assert(sig >= 0); |
229 | ||
0d5b4810 LP |
230 | /* Don't send SIGCONT twice. Also, SIGKILL always works even when process is suspended, hence don't send |
231 | * SIGCONT on SIGKILL. */ | |
232 | if (IN_SET(sig, SIGCONT, SIGKILL)) | |
233 | flags &= ~CGROUP_SIGCONT; | |
234 | ||
8c6db833 LP |
235 | /* This goes through the tasks list and kills them all. This |
236 | * is repeated until no further processes are added to the | |
237 | * tasks list, to properly handle forking processes */ | |
238 | ||
7027ff61 | 239 | if (!s) { |
d5099efc | 240 | s = allocated_set = set_new(NULL); |
7027ff61 | 241 | if (!s) |
ca949c9d | 242 | return -ENOMEM; |
7027ff61 | 243 | } |
8c6db833 LP |
244 | |
245 | my_pid = getpid(); | |
246 | ||
247 | do { | |
7027ff61 | 248 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 249 | pid_t pid = 0; |
8c6db833 LP |
250 | done = true; |
251 | ||
7027ff61 LP |
252 | r = cg_enumerate_processes(controller, path, &f); |
253 | if (r < 0) { | |
4c633005 | 254 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 255 | return r; |
35d2e7ec | 256 | |
7027ff61 | 257 | return ret; |
35d2e7ec | 258 | } |
c6c18be3 LP |
259 | |
260 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 261 | |
1d98fef1 | 262 | if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid) |
c6c18be3 | 263 | continue; |
8c6db833 | 264 | |
fea72cc0 | 265 | if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) |
c6c18be3 | 266 | continue; |
8c6db833 | 267 | |
1d98fef1 LP |
268 | if (log_kill) |
269 | log_kill(pid, sig, userdata); | |
270 | ||
8c6db833 LP |
271 | /* If we haven't killed this process yet, kill |
272 | * it */ | |
4c633005 LP |
273 | if (kill(pid, sig) < 0) { |
274 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 275 | ret = -errno; |
6e8314c4 | 276 | } else { |
1d98fef1 | 277 | if (flags & CGROUP_SIGCONT) |
e155a0aa | 278 | (void) kill(pid, SIGCONT); |
430c18ed | 279 | |
6e8314c4 LP |
280 | if (ret == 0) |
281 | ret = 1; | |
430c18ed | 282 | } |
8c6db833 | 283 | |
8c6db833 LP |
284 | done = false; |
285 | ||
fea72cc0 | 286 | r = set_put(s, PID_TO_PTR(pid)); |
7027ff61 | 287 | if (r < 0) { |
35d2e7ec | 288 | if (ret >= 0) |
7027ff61 | 289 | return r; |
35d2e7ec | 290 | |
7027ff61 | 291 | return ret; |
35d2e7ec LP |
292 | } |
293 | } | |
294 | ||
295 | if (r < 0) { | |
296 | if (ret >= 0) | |
7027ff61 | 297 | return r; |
35d2e7ec | 298 | |
7027ff61 | 299 | return ret; |
8c6db833 LP |
300 | } |
301 | ||
8c6db833 LP |
302 | /* To avoid racing against processes which fork |
303 | * quicker than we can kill them we repeat this until | |
304 | * no new pids need to be killed. */ | |
305 | ||
35d2e7ec | 306 | } while (!done); |
8c6db833 | 307 | |
35d2e7ec | 308 | return ret; |
8c6db833 LP |
309 | } |
310 | ||
1d98fef1 LP |
311 | int cg_kill_recursive( |
312 | const char *controller, | |
313 | const char *path, | |
314 | int sig, | |
315 | CGroupFlags flags, | |
316 | Set *s, | |
317 | cg_kill_log_func_t log_kill, | |
318 | void *userdata) { | |
319 | ||
7027ff61 LP |
320 | _cleanup_set_free_ Set *allocated_set = NULL; |
321 | _cleanup_closedir_ DIR *d = NULL; | |
e155a0aa | 322 | int r, ret; |
35d2e7ec | 323 | char *fn; |
8c6db833 LP |
324 | |
325 | assert(path); | |
8c6db833 LP |
326 | assert(sig >= 0); |
327 | ||
7027ff61 | 328 | if (!s) { |
d5099efc | 329 | s = allocated_set = set_new(NULL); |
7027ff61 | 330 | if (!s) |
ca949c9d | 331 | return -ENOMEM; |
7027ff61 | 332 | } |
ca949c9d | 333 | |
1d98fef1 | 334 | ret = cg_kill(controller, path, sig, flags, s, log_kill, userdata); |
8c6db833 | 335 | |
7027ff61 LP |
336 | r = cg_enumerate_subgroups(controller, path, &d); |
337 | if (r < 0) { | |
4c633005 | 338 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 339 | return r; |
8c6db833 | 340 | |
7027ff61 | 341 | return ret; |
35d2e7ec | 342 | } |
8c6db833 | 343 | |
35d2e7ec | 344 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 345 | _cleanup_free_ char *p = NULL; |
8c6db833 | 346 | |
605405c6 | 347 | p = strjoin(path, "/", fn); |
35d2e7ec | 348 | free(fn); |
7027ff61 LP |
349 | if (!p) |
350 | return -ENOMEM; | |
8c6db833 | 351 | |
1d98fef1 | 352 | r = cg_kill_recursive(controller, p, sig, flags, s, log_kill, userdata); |
e155a0aa | 353 | if (r != 0 && ret >= 0) |
35d2e7ec | 354 | ret = r; |
8c6db833 | 355 | } |
7027ff61 | 356 | if (ret >= 0 && r < 0) |
35d2e7ec LP |
357 | ret = r; |
358 | ||
1d98fef1 | 359 | if (flags & CGROUP_REMOVE) { |
4ad49000 | 360 | r = cg_rmdir(controller, path); |
7027ff61 LP |
361 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
362 | return r; | |
363 | } | |
ca949c9d | 364 | |
8c6db833 LP |
365 | return ret; |
366 | } | |
367 | ||
1d98fef1 LP |
368 | int cg_migrate( |
369 | const char *cfrom, | |
370 | const char *pfrom, | |
371 | const char *cto, | |
372 | const char *pto, | |
373 | CGroupFlags flags) { | |
374 | ||
35d2e7ec | 375 | bool done = false; |
246aa6dd | 376 | _cleanup_set_free_ Set *s = NULL; |
8c6db833 LP |
377 | int r, ret = 0; |
378 | pid_t my_pid; | |
379 | ||
246aa6dd LP |
380 | assert(cfrom); |
381 | assert(pfrom); | |
382 | assert(cto); | |
383 | assert(pto); | |
8c6db833 | 384 | |
d5099efc | 385 | s = set_new(NULL); |
246aa6dd | 386 | if (!s) |
35d2e7ec LP |
387 | return -ENOMEM; |
388 | ||
8c6db833 LP |
389 | my_pid = getpid(); |
390 | ||
391 | do { | |
7027ff61 | 392 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 393 | pid_t pid = 0; |
8c6db833 LP |
394 | done = true; |
395 | ||
b043cd0b | 396 | r = cg_enumerate_processes(cfrom, pfrom, &f); |
246aa6dd | 397 | if (r < 0) { |
4c633005 | 398 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 399 | return r; |
35d2e7ec | 400 | |
246aa6dd | 401 | return ret; |
35d2e7ec | 402 | } |
c6c18be3 LP |
403 | |
404 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 405 | |
35d2e7ec LP |
406 | /* This might do weird stuff if we aren't a |
407 | * single-threaded program. However, we | |
408 | * luckily know we are not */ | |
1d98fef1 | 409 | if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid) |
c6c18be3 | 410 | continue; |
8c6db833 | 411 | |
fea72cc0 | 412 | if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) |
35d2e7ec LP |
413 | continue; |
414 | ||
9b84c7f9 LP |
415 | /* Ignore kernel threads. Since they can only |
416 | * exist in the root cgroup, we only check for | |
417 | * them there. */ | |
418 | if (cfrom && | |
419 | (isempty(pfrom) || path_equal(pfrom, "/")) && | |
420 | is_kernel_thread(pid) > 0) | |
421 | continue; | |
422 | ||
246aa6dd LP |
423 | r = cg_attach(cto, pto, pid); |
424 | if (r < 0) { | |
4c633005 | 425 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
426 | ret = r; |
427 | } else if (ret == 0) | |
428 | ret = 1; | |
8c6db833 | 429 | |
8c6db833 | 430 | done = false; |
35d2e7ec | 431 | |
fea72cc0 | 432 | r = set_put(s, PID_TO_PTR(pid)); |
246aa6dd | 433 | if (r < 0) { |
35d2e7ec | 434 | if (ret >= 0) |
7027ff61 | 435 | return r; |
35d2e7ec | 436 | |
246aa6dd | 437 | return ret; |
35d2e7ec LP |
438 | } |
439 | } | |
440 | ||
441 | if (r < 0) { | |
442 | if (ret >= 0) | |
7027ff61 | 443 | return r; |
35d2e7ec | 444 | |
246aa6dd | 445 | return ret; |
8c6db833 | 446 | } |
35d2e7ec | 447 | } while (!done); |
8c6db833 | 448 | |
35d2e7ec | 449 | return ret; |
8c6db833 LP |
450 | } |
451 | ||
4ad49000 LP |
452 | int cg_migrate_recursive( |
453 | const char *cfrom, | |
454 | const char *pfrom, | |
455 | const char *cto, | |
456 | const char *pto, | |
1d98fef1 | 457 | CGroupFlags flags) { |
4ad49000 | 458 | |
246aa6dd | 459 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 460 | int r, ret = 0; |
35d2e7ec | 461 | char *fn; |
8c6db833 | 462 | |
246aa6dd LP |
463 | assert(cfrom); |
464 | assert(pfrom); | |
465 | assert(cto); | |
466 | assert(pto); | |
8c6db833 | 467 | |
1d98fef1 | 468 | ret = cg_migrate(cfrom, pfrom, cto, pto, flags); |
8c6db833 | 469 | |
246aa6dd LP |
470 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
471 | if (r < 0) { | |
4c633005 | 472 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
473 | return r; |
474 | ||
246aa6dd | 475 | return ret; |
35d2e7ec LP |
476 | } |
477 | ||
478 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 479 | _cleanup_free_ char *p = NULL; |
8c6db833 | 480 | |
605405c6 | 481 | p = strjoin(pfrom, "/", fn); |
35d2e7ec | 482 | free(fn); |
e155a0aa LP |
483 | if (!p) |
484 | return -ENOMEM; | |
8c6db833 | 485 | |
1d98fef1 | 486 | r = cg_migrate_recursive(cfrom, p, cto, pto, flags); |
35d2e7ec LP |
487 | if (r != 0 && ret >= 0) |
488 | ret = r; | |
8c6db833 LP |
489 | } |
490 | ||
35d2e7ec LP |
491 | if (r < 0 && ret >= 0) |
492 | ret = r; | |
493 | ||
1d98fef1 | 494 | if (flags & CGROUP_REMOVE) { |
4ad49000 | 495 | r = cg_rmdir(cfrom, pfrom); |
246aa6dd LP |
496 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
497 | return r; | |
498 | } | |
8c6db833 LP |
499 | |
500 | return ret; | |
501 | } | |
502 | ||
13b84ec7 LP |
503 | int cg_migrate_recursive_fallback( |
504 | const char *cfrom, | |
505 | const char *pfrom, | |
506 | const char *cto, | |
507 | const char *pto, | |
1d98fef1 | 508 | CGroupFlags flags) { |
13b84ec7 LP |
509 | |
510 | int r; | |
511 | ||
512 | assert(cfrom); | |
513 | assert(pfrom); | |
514 | assert(cto); | |
515 | assert(pto); | |
516 | ||
1d98fef1 | 517 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, flags); |
13b84ec7 LP |
518 | if (r < 0) { |
519 | char prefix[strlen(pto) + 1]; | |
520 | ||
521 | /* This didn't work? Then let's try all prefixes of the destination */ | |
522 | ||
fecffe5d | 523 | PATH_FOREACH_PREFIX(prefix, pto) { |
e155a0aa LP |
524 | int q; |
525 | ||
1d98fef1 | 526 | q = cg_migrate_recursive(cfrom, pfrom, cto, prefix, flags); |
e155a0aa LP |
527 | if (q >= 0) |
528 | return q; | |
13b84ec7 LP |
529 | } |
530 | } | |
531 | ||
e155a0aa | 532 | return r; |
13b84ec7 LP |
533 | } |
534 | ||
efdb0237 LP |
535 | static const char *controller_to_dirname(const char *controller) { |
536 | const char *e; | |
3474ae3c | 537 | |
7027ff61 LP |
538 | assert(controller); |
539 | ||
efdb0237 LP |
540 | /* Converts a controller name to the directory name below |
541 | * /sys/fs/cgroup/ we want to mount it to. Effectively, this | |
542 | * just cuts off the name= prefixed used for named | |
543 | * hierarchies, if it is specified. */ | |
544 | ||
545 | e = startswith(controller, "name="); | |
546 | if (e) | |
547 | return e; | |
548 | ||
549 | return controller; | |
3474ae3c LP |
550 | } |
551 | ||
569b19d8 LP |
552 | static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) { |
553 | const char *dn; | |
018ef268 | 554 | char *t = NULL; |
3474ae3c | 555 | |
efdb0237 | 556 | assert(fs); |
569b19d8 LP |
557 | assert(controller); |
558 | ||
559 | dn = controller_to_dirname(controller); | |
efdb0237 LP |
560 | |
561 | if (isempty(path) && isempty(suffix)) | |
569b19d8 | 562 | t = strappend("/sys/fs/cgroup/", dn); |
efdb0237 | 563 | else if (isempty(path)) |
605405c6 | 564 | t = strjoin("/sys/fs/cgroup/", dn, "/", suffix); |
efdb0237 | 565 | else if (isempty(suffix)) |
605405c6 | 566 | t = strjoin("/sys/fs/cgroup/", dn, "/", path); |
efdb0237 | 567 | else |
605405c6 | 568 | t = strjoin("/sys/fs/cgroup/", dn, "/", path, "/", suffix); |
efdb0237 LP |
569 | if (!t) |
570 | return -ENOMEM; | |
3474ae3c | 571 | |
efdb0237 LP |
572 | *fs = t; |
573 | return 0; | |
574 | } | |
575 | ||
576 | static int join_path_unified(const char *path, const char *suffix, char **fs) { | |
577 | char *t; | |
578 | ||
579 | assert(fs); | |
580 | ||
581 | if (isempty(path) && isempty(suffix)) | |
582 | t = strdup("/sys/fs/cgroup"); | |
583 | else if (isempty(path)) | |
584 | t = strappend("/sys/fs/cgroup/", suffix); | |
585 | else if (isempty(suffix)) | |
586 | t = strappend("/sys/fs/cgroup/", path); | |
587 | else | |
605405c6 | 588 | t = strjoin("/sys/fs/cgroup/", path, "/", suffix); |
3474ae3c LP |
589 | if (!t) |
590 | return -ENOMEM; | |
591 | ||
efdb0237 | 592 | *fs = t; |
3474ae3c LP |
593 | return 0; |
594 | } | |
595 | ||
8c6db833 | 596 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
efdb0237 | 597 | int unified, r; |
8c6db833 | 598 | |
dbd821ac LP |
599 | assert(fs); |
600 | ||
efdb0237 LP |
601 | if (!controller) { |
602 | char *t; | |
603 | ||
569b19d8 LP |
604 | /* If no controller is specified, we return the path |
605 | * *below* the controllers, without any prefix. */ | |
efdb0237 LP |
606 | |
607 | if (!path && !suffix) | |
608 | return -EINVAL; | |
609 | ||
989189ea | 610 | if (!suffix) |
efdb0237 | 611 | t = strdup(path); |
989189ea | 612 | else if (!path) |
efdb0237 LP |
613 | t = strdup(suffix); |
614 | else | |
605405c6 | 615 | t = strjoin(path, "/", suffix); |
efdb0237 LP |
616 | if (!t) |
617 | return -ENOMEM; | |
618 | ||
619 | *fs = path_kill_slashes(t); | |
620 | return 0; | |
621 | } | |
622 | ||
623 | if (!cg_controller_is_valid(controller)) | |
78edb35a LP |
624 | return -EINVAL; |
625 | ||
ca2f6384 | 626 | unified = cg_all_unified(); |
efdb0237 LP |
627 | if (unified < 0) |
628 | return unified; | |
70132bd0 | 629 | |
efdb0237 LP |
630 | if (unified > 0) |
631 | r = join_path_unified(path, suffix, fs); | |
569b19d8 LP |
632 | else |
633 | r = join_path_legacy(controller, path, suffix, fs); | |
efdb0237 LP |
634 | if (r < 0) |
635 | return r; | |
7027ff61 | 636 | |
efdb0237 LP |
637 | path_kill_slashes(*fs); |
638 | return 0; | |
3474ae3c | 639 | } |
dbd821ac | 640 | |
efdb0237 LP |
641 | static int controller_is_accessible(const char *controller) { |
642 | int unified; | |
37099707 | 643 | |
efdb0237 | 644 | assert(controller); |
37099707 | 645 | |
efdb0237 LP |
646 | /* Checks whether a specific controller is accessible, |
647 | * i.e. its hierarchy mounted. In the unified hierarchy all | |
648 | * controllers are considered accessible, except for the named | |
649 | * hierarchies */ | |
b12afc8c | 650 | |
efdb0237 LP |
651 | if (!cg_controller_is_valid(controller)) |
652 | return -EINVAL; | |
653 | ||
ca2f6384 | 654 | unified = cg_all_unified(); |
efdb0237 LP |
655 | if (unified < 0) |
656 | return unified; | |
657 | if (unified > 0) { | |
658 | /* We don't support named hierarchies if we are using | |
659 | * the unified hierarchy. */ | |
660 | ||
661 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
662 | return 0; | |
663 | ||
664 | if (startswith(controller, "name=")) | |
665 | return -EOPNOTSUPP; | |
666 | ||
667 | } else { | |
668 | const char *cc, *dn; | |
669 | ||
670 | dn = controller_to_dirname(controller); | |
671 | cc = strjoina("/sys/fs/cgroup/", dn); | |
672 | ||
673 | if (laccess(cc, F_OK) < 0) | |
674 | return -errno; | |
675 | } | |
37099707 LP |
676 | |
677 | return 0; | |
678 | } | |
679 | ||
3474ae3c | 680 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
37099707 | 681 | int r; |
dbd821ac | 682 | |
efdb0237 | 683 | assert(controller); |
3474ae3c | 684 | assert(fs); |
70132bd0 | 685 | |
efdb0237 LP |
686 | /* Check if the specified controller is actually accessible */ |
687 | r = controller_is_accessible(controller); | |
37099707 LP |
688 | if (r < 0) |
689 | return r; | |
3474ae3c | 690 | |
efdb0237 | 691 | return cg_get_path(controller, path, suffix, fs); |
8c6db833 LP |
692 | } |
693 | ||
e27796a0 | 694 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
4ad49000 LP |
695 | assert(path); |
696 | assert(sb); | |
697 | assert(ftwbuf); | |
e27796a0 LP |
698 | |
699 | if (typeflag != FTW_DP) | |
700 | return 0; | |
701 | ||
702 | if (ftwbuf->level < 1) | |
703 | return 0; | |
704 | ||
e155a0aa | 705 | (void) rmdir(path); |
e27796a0 LP |
706 | return 0; |
707 | } | |
708 | ||
8c6db833 | 709 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 710 | _cleanup_free_ char *fs = NULL; |
e27796a0 | 711 | int r = 0; |
8c6db833 | 712 | |
8c6db833 LP |
713 | assert(path); |
714 | ||
e27796a0 LP |
715 | r = cg_get_path(controller, path, NULL, &fs); |
716 | if (r < 0) | |
8c6db833 LP |
717 | return r; |
718 | ||
e27796a0 | 719 | errno = 0; |
e155a0aa LP |
720 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) { |
721 | if (errno == ENOENT) | |
722 | r = 0; | |
b3267152 | 723 | else if (errno > 0) |
e155a0aa LP |
724 | r = -errno; |
725 | else | |
726 | r = -EIO; | |
727 | } | |
e27796a0 LP |
728 | |
729 | if (delete_root) { | |
4ad49000 LP |
730 | if (rmdir(fs) < 0 && errno != ENOENT) |
731 | return -errno; | |
e27796a0 LP |
732 | } |
733 | ||
e27796a0 | 734 | return r; |
8c6db833 LP |
735 | } |
736 | ||
1434ae6f LP |
737 | int cg_create(const char *controller, const char *path) { |
738 | _cleanup_free_ char *fs = NULL; | |
739 | int r; | |
740 | ||
741 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
742 | if (r < 0) | |
743 | return r; | |
744 | ||
745 | r = mkdir_parents(fs, 0755); | |
746 | if (r < 0) | |
747 | return r; | |
748 | ||
749 | if (mkdir(fs, 0755) < 0) { | |
750 | ||
751 | if (errno == EEXIST) | |
752 | return 0; | |
753 | ||
754 | return -errno; | |
755 | } | |
756 | ||
757 | return 1; | |
758 | } | |
759 | ||
760 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
761 | int r, q; | |
762 | ||
763 | assert(pid >= 0); | |
764 | ||
765 | r = cg_create(controller, path); | |
766 | if (r < 0) | |
767 | return r; | |
768 | ||
769 | q = cg_attach(controller, path, pid); | |
770 | if (q < 0) | |
771 | return q; | |
772 | ||
773 | /* This does not remove the cgroup on failure */ | |
774 | return r; | |
775 | } | |
776 | ||
8c6db833 | 777 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
778 | _cleanup_free_ char *fs = NULL; |
779 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
780 | int r; |
781 | ||
8c6db833 LP |
782 | assert(path); |
783 | assert(pid >= 0); | |
784 | ||
b043cd0b | 785 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
3474ae3c | 786 | if (r < 0) |
c6c18be3 | 787 | return r; |
8c6db833 LP |
788 | |
789 | if (pid == 0) | |
790 | pid = getpid(); | |
791 | ||
d054f0a4 | 792 | xsprintf(c, PID_FMT "\n", pid); |
8c6db833 | 793 | |
4c1fc3e4 | 794 | return write_string_file(fs, c, 0); |
8c6db833 LP |
795 | } |
796 | ||
13b84ec7 LP |
797 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
798 | int r; | |
799 | ||
800 | assert(controller); | |
801 | assert(path); | |
802 | assert(pid >= 0); | |
803 | ||
804 | r = cg_attach(controller, path, pid); | |
805 | if (r < 0) { | |
806 | char prefix[strlen(path) + 1]; | |
807 | ||
808 | /* This didn't work? Then let's try all prefixes of | |
809 | * the destination */ | |
810 | ||
fecffe5d | 811 | PATH_FOREACH_PREFIX(prefix, path) { |
e155a0aa LP |
812 | int q; |
813 | ||
814 | q = cg_attach(controller, prefix, pid); | |
815 | if (q >= 0) | |
816 | return q; | |
13b84ec7 LP |
817 | } |
818 | } | |
819 | ||
e155a0aa | 820 | return r; |
13b84ec7 LP |
821 | } |
822 | ||
2d76d14e LP |
823 | int cg_set_group_access( |
824 | const char *controller, | |
825 | const char *path, | |
826 | mode_t mode, | |
827 | uid_t uid, | |
828 | gid_t gid) { | |
829 | ||
574d5f2d | 830 | _cleanup_free_ char *fs = NULL; |
8c6db833 LP |
831 | int r; |
832 | ||
e155a0aa LP |
833 | if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
834 | return 0; | |
8c6db833 | 835 | |
fed1e721 | 836 | if (mode != MODE_INVALID) |
8d53b453 LP |
837 | mode &= 0777; |
838 | ||
839 | r = cg_get_path(controller, path, NULL, &fs); | |
840 | if (r < 0) | |
8c6db833 LP |
841 | return r; |
842 | ||
574d5f2d | 843 | return chmod_and_chown(fs, mode, uid, gid); |
8c6db833 LP |
844 | } |
845 | ||
974efc46 LP |
846 | int cg_set_task_access( |
847 | const char *controller, | |
848 | const char *path, | |
849 | mode_t mode, | |
850 | uid_t uid, | |
4ad49000 | 851 | gid_t gid) { |
974efc46 LP |
852 | |
853 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
efdb0237 | 854 | int r, unified; |
8c6db833 | 855 | |
8c6db833 LP |
856 | assert(path); |
857 | ||
fed1e721 | 858 | if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
8d53b453 LP |
859 | return 0; |
860 | ||
fed1e721 | 861 | if (mode != MODE_INVALID) |
8d53b453 LP |
862 | mode &= 0666; |
863 | ||
b043cd0b | 864 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
8d53b453 | 865 | if (r < 0) |
8c6db833 LP |
866 | return r; |
867 | ||
868 | r = chmod_and_chown(fs, mode, uid, gid); | |
974efc46 LP |
869 | if (r < 0) |
870 | return r; | |
8c6db833 | 871 | |
5da38d07 | 872 | unified = cg_unified(controller); |
efdb0237 LP |
873 | if (unified < 0) |
874 | return unified; | |
875 | if (unified) | |
876 | return 0; | |
877 | ||
b043cd0b LP |
878 | /* Compatibility, Always keep values for "tasks" in sync with |
879 | * "cgroup.procs" */ | |
efdb0237 LP |
880 | if (cg_get_path(controller, path, "tasks", &procs) >= 0) |
881 | (void) chmod_and_chown(procs, mode, uid, gid); | |
974efc46 | 882 | |
efdb0237 | 883 | return 0; |
8c6db833 LP |
884 | } |
885 | ||
4b58153d LP |
886 | int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags) { |
887 | _cleanup_free_ char *fs = NULL; | |
888 | int r; | |
889 | ||
890 | assert(path); | |
891 | assert(name); | |
892 | assert(value || size <= 0); | |
893 | ||
894 | r = cg_get_path(controller, path, NULL, &fs); | |
895 | if (r < 0) | |
896 | return r; | |
897 | ||
898 | if (setxattr(fs, name, value, size, flags) < 0) | |
899 | return -errno; | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
904 | int cg_get_xattr(const char *controller, const char *path, const char *name, void *value, size_t size) { | |
905 | _cleanup_free_ char *fs = NULL; | |
906 | ssize_t n; | |
907 | int r; | |
908 | ||
909 | assert(path); | |
910 | assert(name); | |
911 | ||
912 | r = cg_get_path(controller, path, NULL, &fs); | |
913 | if (r < 0) | |
914 | return r; | |
915 | ||
916 | n = getxattr(fs, name, value, size); | |
917 | if (n < 0) | |
918 | return -errno; | |
919 | ||
920 | return (int) n; | |
921 | } | |
922 | ||
7027ff61 | 923 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
7027ff61 LP |
924 | _cleanup_fclose_ FILE *f = NULL; |
925 | char line[LINE_MAX]; | |
8af8afd6 | 926 | const char *fs; |
efdb0237 LP |
927 | size_t cs = 0; |
928 | int unified; | |
8c6db833 | 929 | |
8c6db833 | 930 | assert(path); |
c6c18be3 | 931 | assert(pid >= 0); |
8c6db833 | 932 | |
5da38d07 TH |
933 | if (controller) { |
934 | if (!cg_controller_is_valid(controller)) | |
935 | return -EINVAL; | |
936 | } else | |
937 | controller = SYSTEMD_CGROUP_CONTROLLER; | |
938 | ||
939 | unified = cg_unified(controller); | |
efdb0237 LP |
940 | if (unified < 0) |
941 | return unified; | |
5da38d07 | 942 | if (unified == 0) |
efdb0237 | 943 | cs = strlen(controller); |
7027ff61 | 944 | |
b68fa010 | 945 | fs = procfs_file_alloca(pid, "cgroup"); |
c6c18be3 | 946 | f = fopen(fs, "re"); |
4c633005 LP |
947 | if (!f) |
948 | return errno == ENOENT ? -ESRCH : -errno; | |
949 | ||
7027ff61 | 950 | FOREACH_LINE(line, f, return -errno) { |
efdb0237 | 951 | char *e, *p; |
c6c18be3 LP |
952 | |
953 | truncate_nl(line); | |
954 | ||
efdb0237 LP |
955 | if (unified) { |
956 | e = startswith(line, "0:"); | |
957 | if (!e) | |
958 | continue; | |
c6c18be3 | 959 | |
efdb0237 LP |
960 | e = strchr(e, ':'); |
961 | if (!e) | |
962 | continue; | |
963 | } else { | |
964 | char *l; | |
965 | size_t k; | |
966 | const char *word, *state; | |
967 | bool found = false; | |
968 | ||
969 | l = strchr(line, ':'); | |
970 | if (!l) | |
971 | continue; | |
8af8afd6 | 972 | |
efdb0237 LP |
973 | l++; |
974 | e = strchr(l, ':'); | |
975 | if (!e) | |
976 | continue; | |
8af8afd6 | 977 | |
efdb0237 LP |
978 | *e = 0; |
979 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { | |
980 | if (k == cs && memcmp(word, controller, cs) == 0) { | |
981 | found = true; | |
982 | break; | |
983 | } | |
8af8afd6 LP |
984 | } |
985 | ||
efdb0237 LP |
986 | if (!found) |
987 | continue; | |
8af8afd6 LP |
988 | } |
989 | ||
8af8afd6 | 990 | p = strdup(e + 1); |
7027ff61 LP |
991 | if (!p) |
992 | return -ENOMEM; | |
c6c18be3 LP |
993 | |
994 | *path = p; | |
7027ff61 | 995 | return 0; |
c6c18be3 LP |
996 | } |
997 | ||
1c80e425 | 998 | return -ENODATA; |
8c6db833 LP |
999 | } |
1000 | ||
1001 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 | 1002 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
efdb0237 LP |
1003 | const char *sc; |
1004 | int r, unified; | |
8c6db833 | 1005 | |
8c6db833 LP |
1006 | assert(agent); |
1007 | ||
5da38d07 | 1008 | unified = cg_unified(controller); |
efdb0237 LP |
1009 | if (unified < 0) |
1010 | return unified; | |
1011 | if (unified) /* doesn't apply to unified hierarchy */ | |
1012 | return -EOPNOTSUPP; | |
1013 | ||
7027ff61 LP |
1014 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
1015 | if (r < 0) | |
c6c18be3 | 1016 | return r; |
8c6db833 | 1017 | |
7027ff61 LP |
1018 | r = read_one_line_file(fs, &contents); |
1019 | if (r < 0) | |
1020 | return r; | |
8c6db833 LP |
1021 | |
1022 | sc = strstrip(contents); | |
e155a0aa | 1023 | if (isempty(sc)) { |
4c1fc3e4 | 1024 | r = write_string_file(fs, agent, 0); |
574d5f2d | 1025 | if (r < 0) |
7027ff61 | 1026 | return r; |
b8725df8 | 1027 | } else if (!path_equal(sc, agent)) |
7027ff61 | 1028 | return -EEXIST; |
8c6db833 | 1029 | |
0da16248 | 1030 | fs = mfree(fs); |
7027ff61 LP |
1031 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
1032 | if (r < 0) | |
1033 | return r; | |
8c6db833 | 1034 | |
0da16248 | 1035 | contents = mfree(contents); |
7027ff61 LP |
1036 | r = read_one_line_file(fs, &contents); |
1037 | if (r < 0) | |
1038 | return r; | |
8c6db833 LP |
1039 | |
1040 | sc = strstrip(contents); | |
8c6db833 | 1041 | if (streq(sc, "0")) { |
4c1fc3e4 | 1042 | r = write_string_file(fs, "1", 0); |
7027ff61 LP |
1043 | if (r < 0) |
1044 | return r; | |
c6c18be3 | 1045 | |
7027ff61 LP |
1046 | return 1; |
1047 | } | |
8c6db833 | 1048 | |
7027ff61 LP |
1049 | if (!streq(sc, "1")) |
1050 | return -EIO; | |
8c6db833 | 1051 | |
7027ff61 | 1052 | return 0; |
8c6db833 LP |
1053 | } |
1054 | ||
ad929bcc KS |
1055 | int cg_uninstall_release_agent(const char *controller) { |
1056 | _cleanup_free_ char *fs = NULL; | |
efdb0237 LP |
1057 | int r, unified; |
1058 | ||
5da38d07 | 1059 | unified = cg_unified(controller); |
efdb0237 LP |
1060 | if (unified < 0) |
1061 | return unified; | |
1062 | if (unified) /* Doesn't apply to unified hierarchy */ | |
1063 | return -EOPNOTSUPP; | |
ad929bcc | 1064 | |
ac9ef333 LP |
1065 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
1066 | if (r < 0) | |
1067 | return r; | |
1068 | ||
4c1fc3e4 | 1069 | r = write_string_file(fs, "0", 0); |
ac9ef333 LP |
1070 | if (r < 0) |
1071 | return r; | |
1072 | ||
0da16248 | 1073 | fs = mfree(fs); |
ac9ef333 | 1074 | |
ad929bcc KS |
1075 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
1076 | if (r < 0) | |
1077 | return r; | |
1078 | ||
4c1fc3e4 | 1079 | r = write_string_file(fs, "", 0); |
ad929bcc KS |
1080 | if (r < 0) |
1081 | return r; | |
1082 | ||
ac9ef333 | 1083 | return 0; |
ad929bcc KS |
1084 | } |
1085 | ||
6f883237 | 1086 | int cg_is_empty(const char *controller, const char *path) { |
7027ff61 | 1087 | _cleanup_fclose_ FILE *f = NULL; |
efdb0237 | 1088 | pid_t pid; |
7027ff61 | 1089 | int r; |
8c6db833 | 1090 | |
8c6db833 LP |
1091 | assert(path); |
1092 | ||
b043cd0b | 1093 | r = cg_enumerate_processes(controller, path, &f); |
6f883237 LP |
1094 | if (r == -ENOENT) |
1095 | return 1; | |
c3175a7f | 1096 | if (r < 0) |
6f883237 | 1097 | return r; |
8c6db833 | 1098 | |
6f883237 | 1099 | r = cg_read_pid(f, &pid); |
c6c18be3 LP |
1100 | if (r < 0) |
1101 | return r; | |
8c6db833 | 1102 | |
6f883237 | 1103 | return r == 0; |
8c6db833 LP |
1104 | } |
1105 | ||
6f883237 | 1106 | int cg_is_empty_recursive(const char *controller, const char *path) { |
efdb0237 | 1107 | int unified, r; |
8c6db833 | 1108 | |
8c6db833 LP |
1109 | assert(path); |
1110 | ||
6fd66507 LP |
1111 | /* The root cgroup is always populated */ |
1112 | if (controller && (isempty(path) || path_equal(path, "/"))) | |
efdb0237 | 1113 | return false; |
6fd66507 | 1114 | |
5da38d07 | 1115 | unified = cg_unified(controller); |
efdb0237 LP |
1116 | if (unified < 0) |
1117 | return unified; | |
35d2e7ec | 1118 | |
efdb0237 | 1119 | if (unified > 0) { |
ab2c3861 | 1120 | _cleanup_free_ char *t = NULL; |
8c6db833 | 1121 | |
efdb0237 | 1122 | /* On the unified hierarchy we can check empty state |
ab2c3861 | 1123 | * via the "populated" attribute of "cgroup.events". */ |
8c6db833 | 1124 | |
ab2c3861 | 1125 | r = cg_read_event(controller, path, "populated", &t); |
efdb0237 LP |
1126 | if (r < 0) |
1127 | return r; | |
1128 | ||
1129 | return streq(t, "0"); | |
1130 | } else { | |
1131 | _cleanup_closedir_ DIR *d = NULL; | |
1132 | char *fn; | |
8c6db833 | 1133 | |
efdb0237 | 1134 | r = cg_is_empty(controller, path); |
35d2e7ec | 1135 | if (r <= 0) |
7027ff61 | 1136 | return r; |
35d2e7ec | 1137 | |
efdb0237 LP |
1138 | r = cg_enumerate_subgroups(controller, path, &d); |
1139 | if (r == -ENOENT) | |
1140 | return 1; | |
1141 | if (r < 0) | |
1142 | return r; | |
35d2e7ec | 1143 | |
efdb0237 LP |
1144 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
1145 | _cleanup_free_ char *p = NULL; | |
1146 | ||
605405c6 | 1147 | p = strjoin(path, "/", fn); |
efdb0237 LP |
1148 | free(fn); |
1149 | if (!p) | |
1150 | return -ENOMEM; | |
1151 | ||
1152 | r = cg_is_empty_recursive(controller, p); | |
1153 | if (r <= 0) | |
1154 | return r; | |
1155 | } | |
1156 | if (r < 0) | |
1157 | return r; | |
1158 | ||
1159 | return true; | |
1160 | } | |
35d2e7ec LP |
1161 | } |
1162 | ||
1163 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
35d2e7ec | 1164 | char *t = NULL, *u = NULL; |
efdb0237 | 1165 | const char *e; |
35d2e7ec LP |
1166 | |
1167 | assert(spec); | |
35d2e7ec LP |
1168 | |
1169 | if (*spec == '/') { | |
e884315e LP |
1170 | if (!path_is_safe(spec)) |
1171 | return -EINVAL; | |
35d2e7ec LP |
1172 | |
1173 | if (path) { | |
246aa6dd LP |
1174 | t = strdup(spec); |
1175 | if (!t) | |
35d2e7ec LP |
1176 | return -ENOMEM; |
1177 | ||
dbb9401d | 1178 | *path = path_kill_slashes(t); |
8c6db833 LP |
1179 | } |
1180 | ||
35d2e7ec LP |
1181 | if (controller) |
1182 | *controller = NULL; | |
1183 | ||
1184 | return 0; | |
8c6db833 LP |
1185 | } |
1186 | ||
246aa6dd LP |
1187 | e = strchr(spec, ':'); |
1188 | if (!e) { | |
185a0874 | 1189 | if (!cg_controller_is_valid(spec)) |
35d2e7ec LP |
1190 | return -EINVAL; |
1191 | ||
1192 | if (controller) { | |
efdb0237 | 1193 | t = strdup(spec); |
246aa6dd | 1194 | if (!t) |
35d2e7ec LP |
1195 | return -ENOMEM; |
1196 | ||
1197 | *controller = t; | |
1198 | } | |
1199 | ||
1200 | if (path) | |
1201 | *path = NULL; | |
1202 | ||
1203 | return 0; | |
8c6db833 LP |
1204 | } |
1205 | ||
efdb0237 | 1206 | t = strndup(spec, e-spec); |
e884315e LP |
1207 | if (!t) |
1208 | return -ENOMEM; | |
185a0874 | 1209 | if (!cg_controller_is_valid(t)) { |
e884315e | 1210 | free(t); |
35d2e7ec | 1211 | return -EINVAL; |
246aa6dd LP |
1212 | } |
1213 | ||
efdb0237 LP |
1214 | if (isempty(e+1)) |
1215 | u = NULL; | |
1216 | else { | |
baa89da4 LP |
1217 | u = strdup(e+1); |
1218 | if (!u) { | |
1219 | free(t); | |
1220 | return -ENOMEM; | |
1221 | } | |
35d2e7ec | 1222 | |
baa89da4 LP |
1223 | if (!path_is_safe(u) || |
1224 | !path_is_absolute(u)) { | |
1225 | free(t); | |
1226 | free(u); | |
1227 | return -EINVAL; | |
1228 | } | |
1229 | ||
1230 | path_kill_slashes(u); | |
1231 | } | |
5954c074 | 1232 | |
35d2e7ec LP |
1233 | if (controller) |
1234 | *controller = t; | |
e884315e LP |
1235 | else |
1236 | free(t); | |
35d2e7ec LP |
1237 | |
1238 | if (path) | |
1239 | *path = u; | |
e884315e LP |
1240 | else |
1241 | free(u); | |
35d2e7ec LP |
1242 | |
1243 | return 0; | |
8c6db833 | 1244 | } |
c6c18be3 | 1245 | |
7027ff61 | 1246 | int cg_mangle_path(const char *path, char **result) { |
78edb35a LP |
1247 | _cleanup_free_ char *c = NULL, *p = NULL; |
1248 | char *t; | |
35d2e7ec LP |
1249 | int r; |
1250 | ||
1251 | assert(path); | |
1252 | assert(result); | |
1253 | ||
73e231ab | 1254 | /* First, check if it already is a filesystem path */ |
7027ff61 | 1255 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 1256 | |
b69d29ce LP |
1257 | t = strdup(path); |
1258 | if (!t) | |
35d2e7ec LP |
1259 | return -ENOMEM; |
1260 | ||
dbb9401d | 1261 | *result = path_kill_slashes(t); |
35d2e7ec LP |
1262 | return 0; |
1263 | } | |
1264 | ||
73e231ab | 1265 | /* Otherwise, treat it as cg spec */ |
b69d29ce LP |
1266 | r = cg_split_spec(path, &c, &p); |
1267 | if (r < 0) | |
35d2e7ec LP |
1268 | return r; |
1269 | ||
efdb0237 | 1270 | return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result); |
35d2e7ec | 1271 | } |
1f73f0f1 | 1272 | |
7027ff61 | 1273 | int cg_get_root_path(char **path) { |
9444b1f2 | 1274 | char *p, *e; |
7027ff61 LP |
1275 | int r; |
1276 | ||
1277 | assert(path); | |
1278 | ||
9444b1f2 | 1279 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1280 | if (r < 0) |
1281 | return r; | |
1282 | ||
efdb0237 LP |
1283 | e = endswith(p, "/" SPECIAL_INIT_SCOPE); |
1284 | if (!e) | |
1285 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */ | |
1286 | if (!e) | |
1287 | e = endswith(p, "/system"); /* even more legacy */ | |
9444b1f2 | 1288 | if (e) |
7027ff61 LP |
1289 | *e = 0; |
1290 | ||
1f73f0f1 LP |
1291 | *path = p; |
1292 | return 0; | |
1293 | } | |
b59e2465 | 1294 | |
751bc6ac LP |
1295 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
1296 | _cleanup_free_ char *rt = NULL; | |
1297 | char *p; | |
ba1261bc LP |
1298 | int r; |
1299 | ||
e9174f29 | 1300 | assert(cgroup); |
751bc6ac | 1301 | assert(shifted); |
e9174f29 LP |
1302 | |
1303 | if (!root) { | |
1304 | /* If the root was specified let's use that, otherwise | |
1305 | * let's determine it from PID 1 */ | |
1306 | ||
751bc6ac | 1307 | r = cg_get_root_path(&rt); |
e9174f29 LP |
1308 | if (r < 0) |
1309 | return r; | |
1310 | ||
751bc6ac | 1311 | root = rt; |
e9174f29 | 1312 | } |
ba1261bc | 1313 | |
751bc6ac | 1314 | p = path_startswith(cgroup, root); |
efdb0237 | 1315 | if (p && p > cgroup) |
751bc6ac LP |
1316 | *shifted = p - 1; |
1317 | else | |
1318 | *shifted = cgroup; | |
1319 | ||
1320 | return 0; | |
1321 | } | |
1322 | ||
1323 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { | |
1324 | _cleanup_free_ char *raw = NULL; | |
1325 | const char *c; | |
1326 | int r; | |
1327 | ||
1328 | assert(pid >= 0); | |
1329 | assert(cgroup); | |
1330 | ||
1331 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
7027ff61 | 1332 | if (r < 0) |
ba1261bc | 1333 | return r; |
ba1261bc | 1334 | |
751bc6ac LP |
1335 | r = cg_shift_path(raw, root, &c); |
1336 | if (r < 0) | |
1337 | return r; | |
ba1261bc | 1338 | |
751bc6ac LP |
1339 | if (c == raw) { |
1340 | *cgroup = raw; | |
1341 | raw = NULL; | |
1342 | } else { | |
1343 | char *n; | |
ba1261bc | 1344 | |
751bc6ac LP |
1345 | n = strdup(c); |
1346 | if (!n) | |
ba1261bc | 1347 | return -ENOMEM; |
ba1261bc | 1348 | |
751bc6ac LP |
1349 | *cgroup = n; |
1350 | } | |
ba1261bc LP |
1351 | |
1352 | return 0; | |
1353 | } | |
1354 | ||
9ed794a3 | 1355 | int cg_path_decode_unit(const char *cgroup, char **unit) { |
8b0849e9 LP |
1356 | char *c, *s; |
1357 | size_t n; | |
ef1673d1 MT |
1358 | |
1359 | assert(cgroup); | |
6c03089c | 1360 | assert(unit); |
ef1673d1 | 1361 | |
8b0849e9 LP |
1362 | n = strcspn(cgroup, "/"); |
1363 | if (n < 3) | |
1364 | return -ENXIO; | |
1365 | ||
1366 | c = strndupa(cgroup, n); | |
ae018d9b | 1367 | c = cg_unescape(c); |
ef1673d1 | 1368 | |
7410616c | 1369 | if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) |
cfeaa44a | 1370 | return -ENXIO; |
ef1673d1 | 1371 | |
d7bd3de0 | 1372 | s = strdup(c); |
6c03089c LP |
1373 | if (!s) |
1374 | return -ENOMEM; | |
1375 | ||
1376 | *unit = s; | |
ef1673d1 MT |
1377 | return 0; |
1378 | } | |
1379 | ||
8b0849e9 LP |
1380 | static bool valid_slice_name(const char *p, size_t n) { |
1381 | ||
1382 | if (!p) | |
1383 | return false; | |
1384 | ||
1385 | if (n < strlen("x.slice")) | |
1386 | return false; | |
1387 | ||
1388 | if (memcmp(p + n - 6, ".slice", 6) == 0) { | |
1389 | char buf[n+1], *c; | |
1390 | ||
1391 | memcpy(buf, p, n); | |
1392 | buf[n] = 0; | |
1393 | ||
1394 | c = cg_unescape(buf); | |
1395 | ||
7410616c | 1396 | return unit_name_is_valid(c, UNIT_NAME_PLAIN); |
8b0849e9 LP |
1397 | } |
1398 | ||
1399 | return false; | |
1400 | } | |
1401 | ||
9444b1f2 | 1402 | static const char *skip_slices(const char *p) { |
8b0849e9 LP |
1403 | assert(p); |
1404 | ||
9444b1f2 LP |
1405 | /* Skips over all slice assignments */ |
1406 | ||
1407 | for (;;) { | |
1021b21b LP |
1408 | size_t n; |
1409 | ||
9444b1f2 LP |
1410 | p += strspn(p, "/"); |
1411 | ||
1412 | n = strcspn(p, "/"); | |
8b0849e9 | 1413 | if (!valid_slice_name(p, n)) |
9444b1f2 LP |
1414 | return p; |
1415 | ||
1416 | p += n; | |
1417 | } | |
1418 | } | |
1419 | ||
8b0849e9 | 1420 | int cg_path_get_unit(const char *path, char **ret) { |
6c03089c | 1421 | const char *e; |
8b0849e9 LP |
1422 | char *unit; |
1423 | int r; | |
6c03089c LP |
1424 | |
1425 | assert(path); | |
8b0849e9 | 1426 | assert(ret); |
6c03089c | 1427 | |
9444b1f2 | 1428 | e = skip_slices(path); |
6c03089c | 1429 | |
8b0849e9 LP |
1430 | r = cg_path_decode_unit(e, &unit); |
1431 | if (r < 0) | |
1432 | return r; | |
1433 | ||
1434 | /* We skipped over the slices, don't accept any now */ | |
1435 | if (endswith(unit, ".slice")) { | |
1436 | free(unit); | |
1437 | return -ENXIO; | |
1438 | } | |
1439 | ||
1440 | *ret = unit; | |
1441 | return 0; | |
6c03089c LP |
1442 | } |
1443 | ||
1444 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
7fd1b19b | 1445 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1446 | int r; |
ba1261bc | 1447 | |
ef1673d1 MT |
1448 | assert(unit); |
1449 | ||
7027ff61 | 1450 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1451 | if (r < 0) |
1452 | return r; | |
1453 | ||
6c03089c LP |
1454 | return cg_path_get_unit(cgroup, unit); |
1455 | } | |
ef1673d1 | 1456 | |
d4fffc4b ZJS |
1457 | /** |
1458 | * Skip session-*.scope, but require it to be there. | |
1459 | */ | |
9444b1f2 LP |
1460 | static const char *skip_session(const char *p) { |
1461 | size_t n; | |
1462 | ||
8b0849e9 LP |
1463 | if (isempty(p)) |
1464 | return NULL; | |
9444b1f2 LP |
1465 | |
1466 | p += strspn(p, "/"); | |
1467 | ||
1468 | n = strcspn(p, "/"); | |
8b0849e9 | 1469 | if (n < strlen("session-x.scope")) |
d4fffc4b ZJS |
1470 | return NULL; |
1471 | ||
8b0849e9 LP |
1472 | if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { |
1473 | char buf[n - 8 - 6 + 1]; | |
1474 | ||
1475 | memcpy(buf, p + 8, n - 8 - 6); | |
1476 | buf[n - 8 - 6] = 0; | |
d4fffc4b | 1477 | |
8b0849e9 LP |
1478 | /* Note that session scopes never need unescaping, |
1479 | * since they cannot conflict with the kernel's own | |
1480 | * names, hence we don't need to call cg_unescape() | |
1481 | * here. */ | |
1482 | ||
1483 | if (!session_id_valid(buf)) | |
1484 | return false; | |
1485 | ||
1486 | p += n; | |
1487 | p += strspn(p, "/"); | |
1488 | return p; | |
1489 | } | |
1490 | ||
1491 | return NULL; | |
d4fffc4b ZJS |
1492 | } |
1493 | ||
1494 | /** | |
1495 | * Skip user@*.service, but require it to be there. | |
1496 | */ | |
1497 | static const char *skip_user_manager(const char *p) { | |
1498 | size_t n; | |
1499 | ||
8b0849e9 LP |
1500 | if (isempty(p)) |
1501 | return NULL; | |
d4fffc4b ZJS |
1502 | |
1503 | p += strspn(p, "/"); | |
1504 | ||
1505 | n = strcspn(p, "/"); | |
8b0849e9 | 1506 | if (n < strlen("user@x.service")) |
6c03089c | 1507 | return NULL; |
ef1673d1 | 1508 | |
8b0849e9 LP |
1509 | if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { |
1510 | char buf[n - 5 - 8 + 1]; | |
9444b1f2 | 1511 | |
8b0849e9 LP |
1512 | memcpy(buf, p + 5, n - 5 - 8); |
1513 | buf[n - 5 - 8] = 0; | |
1514 | ||
1515 | /* Note that user manager services never need unescaping, | |
1516 | * since they cannot conflict with the kernel's own | |
1517 | * names, hence we don't need to call cg_unescape() | |
1518 | * here. */ | |
1519 | ||
1520 | if (parse_uid(buf, NULL) < 0) | |
1521 | return NULL; | |
1522 | ||
1523 | p += n; | |
1524 | p += strspn(p, "/"); | |
1525 | ||
1526 | return p; | |
1527 | } | |
1528 | ||
1529 | return NULL; | |
9444b1f2 LP |
1530 | } |
1531 | ||
329ac4bc | 1532 | static const char *skip_user_prefix(const char *path) { |
d4fffc4b | 1533 | const char *e, *t; |
ef1673d1 | 1534 | |
6c03089c | 1535 | assert(path); |
ba1261bc | 1536 | |
9444b1f2 LP |
1537 | /* Skip slices, if there are any */ |
1538 | e = skip_slices(path); | |
ba1261bc | 1539 | |
329ac4bc | 1540 | /* Skip the user manager, if it's in the path now... */ |
8b0849e9 | 1541 | t = skip_user_manager(e); |
329ac4bc LP |
1542 | if (t) |
1543 | return t; | |
8b0849e9 | 1544 | |
329ac4bc LP |
1545 | /* Alternatively skip the user session if it is in the path... */ |
1546 | return skip_session(e); | |
1547 | } | |
32081481 | 1548 | |
329ac4bc LP |
1549 | int cg_path_get_user_unit(const char *path, char **ret) { |
1550 | const char *t; | |
6c03089c | 1551 | |
329ac4bc LP |
1552 | assert(path); |
1553 | assert(ret); | |
8b0849e9 | 1554 | |
329ac4bc LP |
1555 | t = skip_user_prefix(path); |
1556 | if (!t) | |
8b0849e9 | 1557 | return -ENXIO; |
8b0849e9 | 1558 | |
329ac4bc LP |
1559 | /* And from here on it looks pretty much the same as for a |
1560 | * system unit, hence let's use the same parser from here | |
1561 | * on. */ | |
1562 | return cg_path_get_unit(t, ret); | |
ef1673d1 | 1563 | } |
ba1261bc | 1564 | |
ef1673d1 | 1565 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
7fd1b19b | 1566 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1567 | int r; |
1568 | ||
1569 | assert(unit); | |
1570 | ||
7027ff61 | 1571 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1572 | if (r < 0) |
1573 | return r; | |
1574 | ||
1575 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1576 | } |
e884315e | 1577 | |
7027ff61 | 1578 | int cg_path_get_machine_name(const char *path, char **machine) { |
efdb0237 LP |
1579 | _cleanup_free_ char *u = NULL; |
1580 | const char *sl; | |
89f7c846 | 1581 | int r; |
374ec6ab | 1582 | |
89f7c846 LP |
1583 | r = cg_path_get_unit(path, &u); |
1584 | if (r < 0) | |
1585 | return r; | |
7027ff61 | 1586 | |
efdb0237 | 1587 | sl = strjoina("/run/systemd/machines/unit:", u); |
89f7c846 | 1588 | return readlink_malloc(sl, machine); |
7027ff61 LP |
1589 | } |
1590 | ||
1591 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
7fd1b19b | 1592 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1593 | int r; |
1594 | ||
1595 | assert(machine); | |
1596 | ||
1597 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1598 | if (r < 0) | |
1599 | return r; | |
1600 | ||
1601 | return cg_path_get_machine_name(cgroup, machine); | |
1602 | } | |
1603 | ||
1604 | int cg_path_get_session(const char *path, char **session) { | |
8b0849e9 LP |
1605 | _cleanup_free_ char *unit = NULL; |
1606 | char *start, *end; | |
1607 | int r; | |
7027ff61 LP |
1608 | |
1609 | assert(path); | |
7027ff61 | 1610 | |
8b0849e9 LP |
1611 | r = cg_path_get_unit(path, &unit); |
1612 | if (r < 0) | |
1613 | return r; | |
7027ff61 | 1614 | |
8b0849e9 LP |
1615 | start = startswith(unit, "session-"); |
1616 | if (!start) | |
cfeaa44a | 1617 | return -ENXIO; |
8b0849e9 LP |
1618 | end = endswith(start, ".scope"); |
1619 | if (!end) | |
cfeaa44a | 1620 | return -ENXIO; |
8b0849e9 LP |
1621 | |
1622 | *end = 0; | |
1623 | if (!session_id_valid(start)) | |
cfeaa44a | 1624 | return -ENXIO; |
374ec6ab | 1625 | |
af08d2f9 | 1626 | if (session) { |
8b0849e9 | 1627 | char *rr; |
af08d2f9 | 1628 | |
8b0849e9 LP |
1629 | rr = strdup(start); |
1630 | if (!rr) | |
af08d2f9 LP |
1631 | return -ENOMEM; |
1632 | ||
8b0849e9 | 1633 | *session = rr; |
af08d2f9 | 1634 | } |
7027ff61 | 1635 | |
7027ff61 LP |
1636 | return 0; |
1637 | } | |
1638 | ||
1639 | int cg_pid_get_session(pid_t pid, char **session) { | |
7fd1b19b | 1640 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1641 | int r; |
1642 | ||
7027ff61 LP |
1643 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1644 | if (r < 0) | |
1645 | return r; | |
1646 | ||
1647 | return cg_path_get_session(cgroup, session); | |
1648 | } | |
1649 | ||
ae018d9b | 1650 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
374ec6ab | 1651 | _cleanup_free_ char *slice = NULL; |
8b0849e9 | 1652 | char *start, *end; |
374ec6ab | 1653 | int r; |
ae018d9b LP |
1654 | |
1655 | assert(path); | |
ae018d9b | 1656 | |
374ec6ab LP |
1657 | r = cg_path_get_slice(path, &slice); |
1658 | if (r < 0) | |
1659 | return r; | |
ae018d9b | 1660 | |
674eb685 LP |
1661 | start = startswith(slice, "user-"); |
1662 | if (!start) | |
cfeaa44a | 1663 | return -ENXIO; |
8b0849e9 | 1664 | end = endswith(start, ".slice"); |
674eb685 | 1665 | if (!end) |
cfeaa44a | 1666 | return -ENXIO; |
ae018d9b | 1667 | |
8b0849e9 LP |
1668 | *end = 0; |
1669 | if (parse_uid(start, uid) < 0) | |
cfeaa44a | 1670 | return -ENXIO; |
674eb685 | 1671 | |
674eb685 | 1672 | return 0; |
ae018d9b LP |
1673 | } |
1674 | ||
1675 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1676 | _cleanup_free_ char *cgroup = NULL; | |
1677 | int r; | |
1678 | ||
ae018d9b LP |
1679 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1680 | if (r < 0) | |
1681 | return r; | |
1682 | ||
1683 | return cg_path_get_owner_uid(cgroup, uid); | |
1684 | } | |
1685 | ||
1021b21b LP |
1686 | int cg_path_get_slice(const char *p, char **slice) { |
1687 | const char *e = NULL; | |
1021b21b LP |
1688 | |
1689 | assert(p); | |
1690 | assert(slice); | |
1691 | ||
329ac4bc LP |
1692 | /* Finds the right-most slice unit from the beginning, but |
1693 | * stops before we come to the first non-slice unit. */ | |
1694 | ||
1021b21b LP |
1695 | for (;;) { |
1696 | size_t n; | |
1697 | ||
1698 | p += strspn(p, "/"); | |
1699 | ||
1700 | n = strcspn(p, "/"); | |
8b0849e9 | 1701 | if (!valid_slice_name(p, n)) { |
1021b21b | 1702 | |
8b0849e9 LP |
1703 | if (!e) { |
1704 | char *s; | |
1021b21b | 1705 | |
e5d855d3 | 1706 | s = strdup(SPECIAL_ROOT_SLICE); |
8b0849e9 LP |
1707 | if (!s) |
1708 | return -ENOMEM; | |
1021b21b | 1709 | |
8b0849e9 LP |
1710 | *slice = s; |
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | return cg_path_decode_unit(e, slice); | |
1021b21b LP |
1715 | } |
1716 | ||
1717 | e = p; | |
1021b21b LP |
1718 | p += n; |
1719 | } | |
1720 | } | |
1721 | ||
1722 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1723 | _cleanup_free_ char *cgroup = NULL; | |
1724 | int r; | |
1725 | ||
1726 | assert(slice); | |
1727 | ||
1728 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1729 | if (r < 0) | |
1730 | return r; | |
1731 | ||
1732 | return cg_path_get_slice(cgroup, slice); | |
1733 | } | |
1734 | ||
329ac4bc LP |
1735 | int cg_path_get_user_slice(const char *p, char **slice) { |
1736 | const char *t; | |
1737 | assert(p); | |
1738 | assert(slice); | |
1739 | ||
1740 | t = skip_user_prefix(p); | |
1741 | if (!t) | |
1742 | return -ENXIO; | |
1743 | ||
1744 | /* And now it looks pretty much the same as for a system | |
1745 | * slice, so let's just use the same parser from here on. */ | |
1746 | return cg_path_get_slice(t, slice); | |
1747 | } | |
1748 | ||
1749 | int cg_pid_get_user_slice(pid_t pid, char **slice) { | |
1750 | _cleanup_free_ char *cgroup = NULL; | |
1751 | int r; | |
1752 | ||
1753 | assert(slice); | |
1754 | ||
1755 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1756 | if (r < 0) | |
1757 | return r; | |
1758 | ||
1759 | return cg_path_get_user_slice(cgroup, slice); | |
1760 | } | |
1761 | ||
ae018d9b LP |
1762 | char *cg_escape(const char *p) { |
1763 | bool need_prefix = false; | |
1764 | ||
1765 | /* This implements very minimal escaping for names to be used | |
1766 | * as file names in the cgroup tree: any name which might | |
1767 | * conflict with a kernel name or is prefixed with '_' is | |
1768 | * prefixed with a '_'. That way, when reading cgroup names it | |
1769 | * is sufficient to remove a single prefixing underscore if | |
1770 | * there is one. */ | |
1771 | ||
1772 | /* The return value of this function (unlike cg_unescape()) | |
1773 | * needs free()! */ | |
1774 | ||
a0ab5665 LP |
1775 | if (p[0] == 0 || |
1776 | p[0] == '_' || | |
1777 | p[0] == '.' || | |
1778 | streq(p, "notify_on_release") || | |
1779 | streq(p, "release_agent") || | |
efdb0237 LP |
1780 | streq(p, "tasks") || |
1781 | startswith(p, "cgroup.")) | |
ae018d9b LP |
1782 | need_prefix = true; |
1783 | else { | |
1784 | const char *dot; | |
1785 | ||
1786 | dot = strrchr(p, '.'); | |
1787 | if (dot) { | |
efdb0237 LP |
1788 | CGroupController c; |
1789 | size_t l = dot - p; | |
ae018d9b | 1790 | |
efdb0237 LP |
1791 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
1792 | const char *n; | |
1793 | ||
1794 | n = cgroup_controller_to_string(c); | |
ae018d9b | 1795 | |
efdb0237 LP |
1796 | if (l != strlen(n)) |
1797 | continue; | |
ae018d9b | 1798 | |
efdb0237 LP |
1799 | if (memcmp(p, n, l) != 0) |
1800 | continue; | |
1801 | ||
1802 | need_prefix = true; | |
1803 | break; | |
ae018d9b LP |
1804 | } |
1805 | } | |
1806 | } | |
1807 | ||
1808 | if (need_prefix) | |
1809 | return strappend("_", p); | |
efdb0237 LP |
1810 | |
1811 | return strdup(p); | |
ae018d9b LP |
1812 | } |
1813 | ||
1814 | char *cg_unescape(const char *p) { | |
1815 | assert(p); | |
1816 | ||
1817 | /* The return value of this function (unlike cg_escape()) | |
1818 | * doesn't need free()! */ | |
1819 | ||
1820 | if (p[0] == '_') | |
1821 | return (char*) p+1; | |
1822 | ||
1823 | return (char*) p; | |
1824 | } | |
78edb35a LP |
1825 | |
1826 | #define CONTROLLER_VALID \ | |
4b549144 | 1827 | DIGITS LETTERS \ |
78edb35a LP |
1828 | "_" |
1829 | ||
185a0874 | 1830 | bool cg_controller_is_valid(const char *p) { |
78edb35a LP |
1831 | const char *t, *s; |
1832 | ||
1833 | if (!p) | |
1834 | return false; | |
1835 | ||
185a0874 DJL |
1836 | s = startswith(p, "name="); |
1837 | if (s) | |
1838 | p = s; | |
78edb35a LP |
1839 | |
1840 | if (*p == 0 || *p == '_') | |
1841 | return false; | |
1842 | ||
1843 | for (t = p; *t; t++) | |
1844 | if (!strchr(CONTROLLER_VALID, *t)) | |
1845 | return false; | |
1846 | ||
1847 | if (t - p > FILENAME_MAX) | |
1848 | return false; | |
1849 | ||
1850 | return true; | |
1851 | } | |
a016b922 LP |
1852 | |
1853 | int cg_slice_to_path(const char *unit, char **ret) { | |
1854 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1855 | const char *dash; | |
7410616c | 1856 | int r; |
a016b922 LP |
1857 | |
1858 | assert(unit); | |
1859 | assert(ret); | |
1860 | ||
e5d855d3 | 1861 | if (streq(unit, SPECIAL_ROOT_SLICE)) { |
c96cc582 LP |
1862 | char *x; |
1863 | ||
1864 | x = strdup(""); | |
1865 | if (!x) | |
1866 | return -ENOMEM; | |
1867 | *ret = x; | |
1868 | return 0; | |
1869 | } | |
1870 | ||
7410616c | 1871 | if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) |
a016b922 LP |
1872 | return -EINVAL; |
1873 | ||
1874 | if (!endswith(unit, ".slice")) | |
1875 | return -EINVAL; | |
1876 | ||
7410616c LP |
1877 | r = unit_name_to_prefix(unit, &p); |
1878 | if (r < 0) | |
1879 | return r; | |
a016b922 LP |
1880 | |
1881 | dash = strchr(p, '-'); | |
e66e5b61 LP |
1882 | |
1883 | /* Don't allow initial dashes */ | |
1884 | if (dash == p) | |
1885 | return -EINVAL; | |
1886 | ||
a016b922 LP |
1887 | while (dash) { |
1888 | _cleanup_free_ char *escaped = NULL; | |
1889 | char n[dash - p + sizeof(".slice")]; | |
1890 | ||
e66e5b61 LP |
1891 | /* Don't allow trailing or double dashes */ |
1892 | if (dash[1] == 0 || dash[1] == '-') | |
c96cc582 | 1893 | return -EINVAL; |
a016b922 | 1894 | |
c96cc582 | 1895 | strcpy(stpncpy(n, p, dash - p), ".slice"); |
7410616c | 1896 | if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) |
a016b922 LP |
1897 | return -EINVAL; |
1898 | ||
1899 | escaped = cg_escape(n); | |
1900 | if (!escaped) | |
1901 | return -ENOMEM; | |
1902 | ||
1903 | if (!strextend(&s, escaped, "/", NULL)) | |
1904 | return -ENOMEM; | |
1905 | ||
1906 | dash = strchr(dash+1, '-'); | |
1907 | } | |
1908 | ||
1909 | e = cg_escape(unit); | |
1910 | if (!e) | |
1911 | return -ENOMEM; | |
1912 | ||
1913 | if (!strextend(&s, e, NULL)) | |
1914 | return -ENOMEM; | |
1915 | ||
1916 | *ret = s; | |
1917 | s = NULL; | |
1918 | ||
1919 | return 0; | |
1920 | } | |
4ad49000 LP |
1921 | |
1922 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
1923 | _cleanup_free_ char *p = NULL; | |
1924 | int r; | |
1925 | ||
1926 | r = cg_get_path(controller, path, attribute, &p); | |
1927 | if (r < 0) | |
1928 | return r; | |
1929 | ||
4c1fc3e4 | 1930 | return write_string_file(p, value, 0); |
4ad49000 LP |
1931 | } |
1932 | ||
934277fe LP |
1933 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
1934 | _cleanup_free_ char *p = NULL; | |
1935 | int r; | |
1936 | ||
1937 | r = cg_get_path(controller, path, attribute, &p); | |
1938 | if (r < 0) | |
1939 | return r; | |
1940 | ||
1941 | return read_one_line_file(p, ret); | |
1942 | } | |
1943 | ||
66ebf6c0 TH |
1944 | int cg_get_keyed_attribute(const char *controller, const char *path, const char *attribute, const char **keys, char **values) { |
1945 | _cleanup_free_ char *filename = NULL, *content = NULL; | |
1946 | char *line, *p; | |
1947 | int i, r; | |
1948 | ||
1949 | for (i = 0; keys[i]; i++) | |
1950 | values[i] = NULL; | |
1951 | ||
1952 | r = cg_get_path(controller, path, attribute, &filename); | |
1953 | if (r < 0) | |
1954 | return r; | |
1955 | ||
1956 | r = read_full_file(filename, &content, NULL); | |
1957 | if (r < 0) | |
1958 | return r; | |
1959 | ||
1960 | p = content; | |
1961 | while ((line = strsep(&p, "\n"))) { | |
1962 | char *key; | |
1963 | ||
1964 | key = strsep(&line, " "); | |
1965 | ||
1966 | for (i = 0; keys[i]; i++) { | |
1967 | if (streq(key, keys[i])) { | |
1968 | values[i] = strdup(line); | |
1969 | break; | |
1970 | } | |
1971 | } | |
1972 | } | |
1973 | ||
1974 | for (i = 0; keys[i]; i++) { | |
1975 | if (!values[i]) { | |
1976 | for (i = 0; keys[i]; i++) { | |
1977 | free(values[i]); | |
1978 | values[i] = NULL; | |
1979 | } | |
1980 | return -ENOENT; | |
1981 | } | |
1982 | } | |
1983 | ||
1984 | return 0; | |
1985 | } | |
1986 | ||
efdb0237 LP |
1987 | int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) { |
1988 | CGroupController c; | |
1989 | int r, unified; | |
4ad49000 LP |
1990 | |
1991 | /* This one will create a cgroup in our private tree, but also | |
1992 | * duplicate it in the trees specified in mask, and remove it | |
1993 | * in all others */ | |
1994 | ||
1995 | /* First create the cgroup in our own hierarchy. */ | |
1996 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
1997 | if (r < 0) | |
1998 | return r; | |
1999 | ||
efdb0237 | 2000 | /* If we are in the unified hierarchy, we are done now */ |
ca2f6384 | 2001 | unified = cg_all_unified(); |
efdb0237 LP |
2002 | if (unified < 0) |
2003 | return unified; | |
2004 | if (unified > 0) | |
2005 | return 0; | |
2006 | ||
2007 | /* Otherwise, do the same in the other hierarchies */ | |
2008 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2009 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2010 | const char *n; | |
2011 | ||
2012 | n = cgroup_controller_to_string(c); | |
2013 | ||
13b84ec7 | 2014 | if (mask & bit) |
efdb0237 | 2015 | (void) cg_create(n, path); |
13b84ec7 | 2016 | else if (supported & bit) |
efdb0237 | 2017 | (void) cg_trim(n, path, true); |
4ad49000 LP |
2018 | } |
2019 | ||
13b84ec7 | 2020 | return 0; |
4ad49000 LP |
2021 | } |
2022 | ||
efdb0237 LP |
2023 | int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { |
2024 | CGroupController c; | |
2025 | int r, unified; | |
4ad49000 LP |
2026 | |
2027 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
13b84ec7 LP |
2028 | if (r < 0) |
2029 | return r; | |
4ad49000 | 2030 | |
ca2f6384 | 2031 | unified = cg_all_unified(); |
efdb0237 LP |
2032 | if (unified < 0) |
2033 | return unified; | |
2034 | if (unified > 0) | |
2035 | return 0; | |
7b3fd631 | 2036 | |
efdb0237 LP |
2037 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
2038 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2039 | const char *p = NULL; | |
7b3fd631 | 2040 | |
efdb0237 LP |
2041 | if (!(supported & bit)) |
2042 | continue; | |
7b3fd631 | 2043 | |
efdb0237 LP |
2044 | if (path_callback) |
2045 | p = path_callback(bit, userdata); | |
7b3fd631 | 2046 | |
efdb0237 LP |
2047 | if (!p) |
2048 | p = path; | |
4ad49000 | 2049 | |
efdb0237 | 2050 | (void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid); |
4ad49000 LP |
2051 | } |
2052 | ||
13b84ec7 | 2053 | return 0; |
4ad49000 LP |
2054 | } |
2055 | ||
efdb0237 | 2056 | int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { |
6c12b52e LP |
2057 | Iterator i; |
2058 | void *pidp; | |
2059 | int r = 0; | |
2060 | ||
2061 | SET_FOREACH(pidp, pids, i) { | |
fea72cc0 | 2062 | pid_t pid = PTR_TO_PID(pidp); |
13b84ec7 | 2063 | int q; |
6c12b52e | 2064 | |
7b3fd631 | 2065 | q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); |
efdb0237 | 2066 | if (q < 0 && r >= 0) |
13b84ec7 | 2067 | r = q; |
6c12b52e LP |
2068 | } |
2069 | ||
2070 | return r; | |
2071 | } | |
2072 | ||
efdb0237 | 2073 | int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
b3c5bad3 | 2074 | CGroupController c; |
ba09d9c6 | 2075 | int r = 0, unified; |
4ad49000 | 2076 | |
13b84ec7 | 2077 | if (!path_equal(from, to)) { |
1d98fef1 | 2078 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE); |
13b84ec7 LP |
2079 | if (r < 0) |
2080 | return r; | |
2081 | } | |
4ad49000 | 2082 | |
ca2f6384 | 2083 | unified = cg_all_unified(); |
efdb0237 LP |
2084 | if (unified < 0) |
2085 | return unified; | |
2086 | if (unified > 0) | |
2087 | return r; | |
03b90d4b | 2088 | |
efdb0237 LP |
2089 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
2090 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2091 | const char *p = NULL; | |
03b90d4b | 2092 | |
efdb0237 LP |
2093 | if (!(supported & bit)) |
2094 | continue; | |
03b90d4b | 2095 | |
efdb0237 LP |
2096 | if (to_callback) |
2097 | p = to_callback(bit, userdata); | |
4ad49000 | 2098 | |
efdb0237 LP |
2099 | if (!p) |
2100 | p = to; | |
2101 | ||
1d98fef1 | 2102 | (void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, 0); |
4ad49000 LP |
2103 | } |
2104 | ||
13b84ec7 | 2105 | return 0; |
4ad49000 LP |
2106 | } |
2107 | ||
efdb0237 LP |
2108 | int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) { |
2109 | CGroupController c; | |
2110 | int r, unified; | |
4ad49000 LP |
2111 | |
2112 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
2113 | if (r < 0) | |
2114 | return r; | |
2115 | ||
ca2f6384 | 2116 | unified = cg_all_unified(); |
efdb0237 LP |
2117 | if (unified < 0) |
2118 | return unified; | |
2119 | if (unified > 0) | |
2120 | return r; | |
2121 | ||
2122 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2123 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2124 | ||
2125 | if (!(supported & bit)) | |
2126 | continue; | |
4ad49000 | 2127 | |
efdb0237 | 2128 | (void) cg_trim(cgroup_controller_to_string(c), path, delete_root); |
4ad49000 LP |
2129 | } |
2130 | ||
13b84ec7 | 2131 | return 0; |
4ad49000 LP |
2132 | } |
2133 | ||
efdb0237 LP |
2134 | int cg_mask_supported(CGroupMask *ret) { |
2135 | CGroupMask mask = 0; | |
2136 | int r, unified; | |
2137 | ||
2138 | /* Determines the mask of supported cgroup controllers. Only | |
2139 | * includes controllers we can make sense of and that are | |
2140 | * actually accessible. */ | |
4ad49000 | 2141 | |
ca2f6384 | 2142 | unified = cg_all_unified(); |
efdb0237 LP |
2143 | if (unified < 0) |
2144 | return unified; | |
2145 | if (unified > 0) { | |
5f4c5fef | 2146 | _cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL; |
efdb0237 LP |
2147 | const char *c; |
2148 | ||
2149 | /* In the unified hierarchy we can read the supported | |
2150 | * and accessible controllers from a the top-level | |
2151 | * cgroup attribute */ | |
2152 | ||
5f4c5fef LP |
2153 | r = cg_get_root_path(&root); |
2154 | if (r < 0) | |
2155 | return r; | |
2156 | ||
2157 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path); | |
2158 | if (r < 0) | |
2159 | return r; | |
2160 | ||
2161 | r = read_one_line_file(path, &controllers); | |
efdb0237 LP |
2162 | if (r < 0) |
2163 | return r; | |
4ad49000 | 2164 | |
efdb0237 LP |
2165 | c = controllers; |
2166 | for (;;) { | |
2167 | _cleanup_free_ char *n = NULL; | |
2168 | CGroupController v; | |
2169 | ||
2170 | r = extract_first_word(&c, &n, NULL, 0); | |
2171 | if (r < 0) | |
2172 | return r; | |
2173 | if (r == 0) | |
2174 | break; | |
2175 | ||
2176 | v = cgroup_controller_from_string(n); | |
2177 | if (v < 0) | |
2178 | continue; | |
2179 | ||
2180 | mask |= CGROUP_CONTROLLER_TO_MASK(v); | |
2181 | } | |
2182 | ||
66ebf6c0 | 2183 | /* Currently, we support the cpu, memory, io and pids |
03a7b521 LP |
2184 | * controller in the unified hierarchy, mask |
2185 | * everything else off. */ | |
66ebf6c0 | 2186 | mask &= CGROUP_MASK_CPU | CGROUP_MASK_MEMORY | CGROUP_MASK_IO | CGROUP_MASK_PIDS; |
efdb0237 LP |
2187 | |
2188 | } else { | |
2189 | CGroupController c; | |
2190 | ||
2191 | /* In the legacy hierarchy, we check whether which | |
2192 | * hierarchies are mounted. */ | |
2193 | ||
2194 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2195 | const char *n; | |
2196 | ||
2197 | n = cgroup_controller_to_string(c); | |
2198 | if (controller_is_accessible(n) >= 0) | |
2199 | mask |= CGROUP_CONTROLLER_TO_MASK(c); | |
2200 | } | |
4ad49000 LP |
2201 | } |
2202 | ||
efdb0237 LP |
2203 | *ret = mask; |
2204 | return 0; | |
4ad49000 | 2205 | } |
b12afc8c LP |
2206 | |
2207 | int cg_kernel_controllers(Set *controllers) { | |
2208 | _cleanup_fclose_ FILE *f = NULL; | |
2209 | char buf[LINE_MAX]; | |
2210 | int r; | |
2211 | ||
2212 | assert(controllers); | |
2213 | ||
e155a0aa LP |
2214 | /* Determines the full list of kernel-known controllers. Might |
2215 | * include controllers we don't actually support, arbitrary | |
2216 | * named hierarchies and controllers that aren't currently | |
2217 | * accessible (because not mounted). */ | |
2218 | ||
b12afc8c LP |
2219 | f = fopen("/proc/cgroups", "re"); |
2220 | if (!f) { | |
2221 | if (errno == ENOENT) | |
2222 | return 0; | |
2223 | return -errno; | |
2224 | } | |
2225 | ||
2226 | /* Ignore the header line */ | |
2227 | (void) fgets(buf, sizeof(buf), f); | |
2228 | ||
2229 | for (;;) { | |
2230 | char *controller; | |
2231 | int enabled = 0; | |
2232 | ||
2233 | errno = 0; | |
2234 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { | |
2235 | ||
2236 | if (feof(f)) | |
2237 | break; | |
2238 | ||
b3267152 | 2239 | if (ferror(f) && errno > 0) |
b12afc8c LP |
2240 | return -errno; |
2241 | ||
2242 | return -EBADMSG; | |
2243 | } | |
2244 | ||
2245 | if (!enabled) { | |
2246 | free(controller); | |
2247 | continue; | |
2248 | } | |
2249 | ||
efdb0237 | 2250 | if (!cg_controller_is_valid(controller)) { |
b12afc8c LP |
2251 | free(controller); |
2252 | return -EBADMSG; | |
2253 | } | |
2254 | ||
2255 | r = set_consume(controllers, controller); | |
2256 | if (r < 0) | |
2257 | return r; | |
2258 | } | |
2259 | ||
2260 | return 0; | |
2261 | } | |
efdb0237 | 2262 | |
5da38d07 TH |
2263 | static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN; |
2264 | ||
2265 | static int cg_update_unified(void) { | |
efdb0237 | 2266 | |
efdb0237 LP |
2267 | struct statfs fs; |
2268 | ||
2269 | /* Checks if we support the unified hierarchy. Returns an | |
2270 | * error when the cgroup hierarchies aren't mounted yet or we | |
2271 | * have any other trouble determining if the unified hierarchy | |
2272 | * is supported. */ | |
2273 | ||
5da38d07 TH |
2274 | if (unified_cache >= CGROUP_UNIFIED_NONE) |
2275 | return 0; | |
efdb0237 LP |
2276 | |
2277 | if (statfs("/sys/fs/cgroup/", &fs) < 0) | |
2278 | return -errno; | |
2279 | ||
09961995 | 2280 | if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) |
5da38d07 TH |
2281 | unified_cache = CGROUP_UNIFIED_ALL; |
2282 | else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) { | |
2283 | if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0) | |
2284 | return -errno; | |
2285 | ||
2286 | unified_cache = F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC) ? | |
2287 | CGROUP_UNIFIED_SYSTEMD : CGROUP_UNIFIED_NONE; | |
2288 | } else | |
8b3aa503 | 2289 | return -ENOMEDIUM; |
efdb0237 | 2290 | |
5da38d07 TH |
2291 | return 0; |
2292 | } | |
2293 | ||
2294 | int cg_unified(const char *controller) { | |
2295 | ||
2296 | int r; | |
2297 | ||
2298 | r = cg_update_unified(); | |
2299 | if (r < 0) | |
2300 | return r; | |
2301 | ||
2302 | if (streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
2303 | return unified_cache >= CGROUP_UNIFIED_SYSTEMD; | |
2304 | else | |
2305 | return unified_cache >= CGROUP_UNIFIED_ALL; | |
2306 | } | |
2307 | ||
2308 | int cg_all_unified(void) { | |
2309 | ||
2310 | return cg_unified(NULL); | |
efdb0237 LP |
2311 | } |
2312 | ||
2313 | void cg_unified_flush(void) { | |
5da38d07 | 2314 | unified_cache = CGROUP_UNIFIED_UNKNOWN; |
efdb0237 LP |
2315 | } |
2316 | ||
2317 | int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) { | |
2318 | _cleanup_free_ char *fs = NULL; | |
2319 | CGroupController c; | |
2320 | int r, unified; | |
2321 | ||
2322 | assert(p); | |
2323 | ||
2324 | if (supported == 0) | |
2325 | return 0; | |
2326 | ||
ca2f6384 | 2327 | unified = cg_all_unified(); |
efdb0237 LP |
2328 | if (unified < 0) |
2329 | return unified; | |
2330 | if (!unified) /* on the legacy hiearchy there's no joining of controllers defined */ | |
2331 | return 0; | |
2332 | ||
2333 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs); | |
2334 | if (r < 0) | |
2335 | return r; | |
2336 | ||
2337 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2338 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2339 | const char *n; | |
2340 | ||
2341 | if (!(supported & bit)) | |
2342 | continue; | |
2343 | ||
2344 | n = cgroup_controller_to_string(c); | |
2345 | { | |
2346 | char s[1 + strlen(n) + 1]; | |
2347 | ||
2348 | s[0] = mask & bit ? '+' : '-'; | |
2349 | strcpy(s + 1, n); | |
2350 | ||
2351 | r = write_string_file(fs, s, 0); | |
2352 | if (r < 0) | |
98e4d8d7 | 2353 | log_debug_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs); |
efdb0237 LP |
2354 | } |
2355 | } | |
2356 | ||
2357 | return 0; | |
2358 | } | |
2359 | ||
2360 | bool cg_is_unified_wanted(void) { | |
2361 | static thread_local int wanted = -1; | |
2362 | int r, unified; | |
1d84ad94 | 2363 | bool b; |
efdb0237 LP |
2364 | |
2365 | /* If the hierarchy is already mounted, then follow whatever | |
2366 | * was chosen for it. */ | |
ca2f6384 | 2367 | unified = cg_all_unified(); |
efdb0237 LP |
2368 | if (unified >= 0) |
2369 | return unified; | |
2370 | ||
2371 | /* Otherwise, let's see what the kernel command line has to | |
2372 | * say. Since checking that is expensive, let's cache the | |
2373 | * result. */ | |
2374 | if (wanted >= 0) | |
2375 | return wanted; | |
2376 | ||
1d84ad94 LP |
2377 | r = proc_cmdline_get_bool("systemd.unified_cgroup_hierarchy", &b); |
2378 | if (r < 0) | |
2379 | return false; | |
efdb0237 | 2380 | |
1d84ad94 | 2381 | return (wanted = r > 0 ? b : false); |
efdb0237 LP |
2382 | } |
2383 | ||
2384 | bool cg_is_legacy_wanted(void) { | |
2385 | return !cg_is_unified_wanted(); | |
2386 | } | |
2387 | ||
5da38d07 TH |
2388 | bool cg_is_unified_systemd_controller_wanted(void) { |
2389 | static thread_local int wanted = -1; | |
2390 | int r, unified; | |
1d84ad94 | 2391 | bool b; |
5da38d07 TH |
2392 | |
2393 | /* If the unified hierarchy is requested in full, no need to | |
2394 | * bother with this. */ | |
2395 | if (cg_is_unified_wanted()) | |
2396 | return 0; | |
2397 | ||
2398 | /* If the hierarchy is already mounted, then follow whatever | |
2399 | * was chosen for it. */ | |
2400 | unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER); | |
2401 | if (unified >= 0) | |
2402 | return unified; | |
2403 | ||
2404 | /* Otherwise, let's see what the kernel command line has to | |
2405 | * say. Since checking that is expensive, let's cache the | |
2406 | * result. */ | |
2407 | if (wanted >= 0) | |
2408 | return wanted; | |
2409 | ||
1d84ad94 LP |
2410 | r = proc_cmdline_get_bool("systemd.legacy_systemd_cgroup_controller", &b); |
2411 | if (r < 0) | |
2412 | return false; | |
5da38d07 | 2413 | |
1d84ad94 | 2414 | return (wanted = r > 0 ? b : false); |
5da38d07 TH |
2415 | } |
2416 | ||
2417 | bool cg_is_legacy_systemd_controller_wanted(void) { | |
2418 | return cg_is_legacy_wanted() && !cg_is_unified_systemd_controller_wanted(); | |
2419 | } | |
2420 | ||
13c31542 TH |
2421 | int cg_weight_parse(const char *s, uint64_t *ret) { |
2422 | uint64_t u; | |
2423 | int r; | |
2424 | ||
2425 | if (isempty(s)) { | |
2426 | *ret = CGROUP_WEIGHT_INVALID; | |
2427 | return 0; | |
2428 | } | |
2429 | ||
2430 | r = safe_atou64(s, &u); | |
2431 | if (r < 0) | |
2432 | return r; | |
2433 | ||
2434 | if (u < CGROUP_WEIGHT_MIN || u > CGROUP_WEIGHT_MAX) | |
2435 | return -ERANGE; | |
2436 | ||
2437 | *ret = u; | |
2438 | return 0; | |
2439 | } | |
2440 | ||
9be57249 TH |
2441 | const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX] = { |
2442 | [CGROUP_IO_RBPS_MAX] = CGROUP_LIMIT_MAX, | |
2443 | [CGROUP_IO_WBPS_MAX] = CGROUP_LIMIT_MAX, | |
ac06a0cf TH |
2444 | [CGROUP_IO_RIOPS_MAX] = CGROUP_LIMIT_MAX, |
2445 | [CGROUP_IO_WIOPS_MAX] = CGROUP_LIMIT_MAX, | |
9be57249 TH |
2446 | }; |
2447 | ||
2448 | static const char* const cgroup_io_limit_type_table[_CGROUP_IO_LIMIT_TYPE_MAX] = { | |
2449 | [CGROUP_IO_RBPS_MAX] = "IOReadBandwidthMax", | |
2450 | [CGROUP_IO_WBPS_MAX] = "IOWriteBandwidthMax", | |
ac06a0cf TH |
2451 | [CGROUP_IO_RIOPS_MAX] = "IOReadIOPSMax", |
2452 | [CGROUP_IO_WIOPS_MAX] = "IOWriteIOPSMax", | |
9be57249 TH |
2453 | }; |
2454 | ||
2455 | DEFINE_STRING_TABLE_LOOKUP(cgroup_io_limit_type, CGroupIOLimitType); | |
2456 | ||
d53d9474 LP |
2457 | int cg_cpu_shares_parse(const char *s, uint64_t *ret) { |
2458 | uint64_t u; | |
2459 | int r; | |
2460 | ||
2461 | if (isempty(s)) { | |
2462 | *ret = CGROUP_CPU_SHARES_INVALID; | |
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | r = safe_atou64(s, &u); | |
2467 | if (r < 0) | |
2468 | return r; | |
2469 | ||
2470 | if (u < CGROUP_CPU_SHARES_MIN || u > CGROUP_CPU_SHARES_MAX) | |
2471 | return -ERANGE; | |
2472 | ||
2473 | *ret = u; | |
2474 | return 0; | |
2475 | } | |
2476 | ||
2477 | int cg_blkio_weight_parse(const char *s, uint64_t *ret) { | |
2478 | uint64_t u; | |
2479 | int r; | |
2480 | ||
2481 | if (isempty(s)) { | |
2482 | *ret = CGROUP_BLKIO_WEIGHT_INVALID; | |
2483 | return 0; | |
2484 | } | |
2485 | ||
2486 | r = safe_atou64(s, &u); | |
2487 | if (r < 0) | |
2488 | return r; | |
2489 | ||
2490 | if (u < CGROUP_BLKIO_WEIGHT_MIN || u > CGROUP_BLKIO_WEIGHT_MAX) | |
2491 | return -ERANGE; | |
2492 | ||
2493 | *ret = u; | |
2494 | return 0; | |
2495 | } | |
2496 | ||
f0bef277 EV |
2497 | bool is_cgroup_fs(const struct statfs *s) { |
2498 | return is_fs_type(s, CGROUP_SUPER_MAGIC) || | |
2499 | is_fs_type(s, CGROUP2_SUPER_MAGIC); | |
2500 | } | |
2501 | ||
2502 | bool fd_is_cgroup_fs(int fd) { | |
2503 | struct statfs s; | |
2504 | ||
2505 | if (fstatfs(fd, &s) < 0) | |
2506 | return -errno; | |
2507 | ||
2508 | return is_cgroup_fs(&s); | |
2509 | } | |
2510 | ||
efdb0237 LP |
2511 | static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = { |
2512 | [CGROUP_CONTROLLER_CPU] = "cpu", | |
2513 | [CGROUP_CONTROLLER_CPUACCT] = "cpuacct", | |
13c31542 | 2514 | [CGROUP_CONTROLLER_IO] = "io", |
efdb0237 LP |
2515 | [CGROUP_CONTROLLER_BLKIO] = "blkio", |
2516 | [CGROUP_CONTROLLER_MEMORY] = "memory", | |
3905f127 | 2517 | [CGROUP_CONTROLLER_DEVICES] = "devices", |
03a7b521 | 2518 | [CGROUP_CONTROLLER_PIDS] = "pids", |
efdb0237 LP |
2519 | }; |
2520 | ||
2521 | DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController); |