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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8c6db833 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
8c6db833 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
8c6db833 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
8c6db833 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
84ac7bea | 21 | #include <dirent.h> |
8c6db833 | 22 | #include <errno.h> |
84ac7bea | 23 | #include <ftw.h> |
11c3a366 | 24 | #include <limits.h> |
8c6db833 | 25 | #include <signal.h> |
11c3a366 | 26 | #include <stddef.h> |
35bbbf85 | 27 | #include <stdio_ext.h> |
8c6db833 | 28 | #include <stdlib.h> |
84ac7bea | 29 | #include <string.h> |
672c48cc | 30 | #include <sys/stat.h> |
11c3a366 | 31 | #include <sys/statfs.h> |
672c48cc | 32 | #include <sys/types.h> |
4b58153d | 33 | #include <sys/xattr.h> |
84ac7bea | 34 | #include <unistd.h> |
8c6db833 | 35 | |
b5efdb8a | 36 | #include "alloc-util.h" |
3ffd4af2 | 37 | #include "cgroup-util.h" |
93cc7779 | 38 | #include "def.h" |
a0956174 | 39 | #include "dirent-util.h" |
84ac7bea | 40 | #include "extract-word.h" |
3ffd4af2 | 41 | #include "fd-util.h" |
84ac7bea | 42 | #include "fileio.h" |
f97b34a6 | 43 | #include "format-util.h" |
f4f15635 | 44 | #include "fs-util.h" |
93cc7779 | 45 | #include "log.h" |
84ac7bea LP |
46 | #include "login-util.h" |
47 | #include "macro.h" | |
93cc7779 | 48 | #include "missing.h" |
84ac7bea | 49 | #include "mkdir.h" |
6bedfcbb | 50 | #include "parse-util.h" |
9eb977db | 51 | #include "path-util.h" |
872a590e | 52 | #include "proc-cmdline.h" |
84ac7bea LP |
53 | #include "process-util.h" |
54 | #include "set.h" | |
9444b1f2 | 55 | #include "special.h" |
872a590e | 56 | #include "stat-util.h" |
d054f0a4 | 57 | #include "stdio-util.h" |
8b43440b | 58 | #include "string-table.h" |
07630cea | 59 | #include "string-util.h" |
aae7e17f | 60 | #include "strv.h" |
84ac7bea | 61 | #include "unit-name.h" |
b1d4f8e1 | 62 | #include "user-util.h" |
8c6db833 | 63 | |
c6c18be3 | 64 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
7027ff61 | 65 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 66 | FILE *f; |
7027ff61 | 67 | int r; |
c6c18be3 | 68 | |
c6c18be3 LP |
69 | assert(_f); |
70 | ||
c3175a7f LP |
71 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
72 | if (r < 0) | |
c6c18be3 LP |
73 | return r; |
74 | ||
75 | f = fopen(fs, "re"); | |
c6c18be3 LP |
76 | if (!f) |
77 | return -errno; | |
78 | ||
79 | *_f = f; | |
80 | return 0; | |
81 | } | |
82 | ||
c6c18be3 LP |
83 | int cg_read_pid(FILE *f, pid_t *_pid) { |
84 | unsigned long ul; | |
85 | ||
86 | /* Note that the cgroup.procs might contain duplicates! See | |
87 | * cgroups.txt for details. */ | |
88 | ||
7027ff61 LP |
89 | assert(f); |
90 | assert(_pid); | |
91 | ||
c6c18be3 LP |
92 | errno = 0; |
93 | if (fscanf(f, "%lu", &ul) != 1) { | |
94 | ||
95 | if (feof(f)) | |
96 | return 0; | |
97 | ||
f5e5c28f | 98 | return errno > 0 ? -errno : -EIO; |
c6c18be3 LP |
99 | } |
100 | ||
101 | if (ul <= 0) | |
102 | return -EIO; | |
103 | ||
104 | *_pid = (pid_t) ul; | |
105 | return 1; | |
106 | } | |
107 | ||
8b238b13 LP |
108 | int cg_read_event( |
109 | const char *controller, | |
110 | const char *path, | |
111 | const char *event, | |
112 | char **val) { | |
113 | ||
ab2c3861 TH |
114 | _cleanup_free_ char *events = NULL, *content = NULL; |
115 | char *p, *line; | |
116 | int r; | |
117 | ||
118 | r = cg_get_path(controller, path, "cgroup.events", &events); | |
119 | if (r < 0) | |
120 | return r; | |
121 | ||
122 | r = read_full_file(events, &content, NULL); | |
123 | if (r < 0) | |
124 | return r; | |
125 | ||
126 | p = content; | |
127 | while ((line = strsep(&p, "\n"))) { | |
128 | char *key; | |
129 | ||
130 | key = strsep(&line, " "); | |
131 | if (!key || !line) | |
132 | return -EINVAL; | |
133 | ||
134 | if (strcmp(key, event)) | |
135 | continue; | |
136 | ||
137 | *val = strdup(line); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | return -ENOENT; | |
142 | } | |
143 | ||
3228995c CB |
144 | bool cg_ns_supported(void) { |
145 | static thread_local int enabled = -1; | |
146 | ||
147 | if (enabled >= 0) | |
148 | return enabled; | |
149 | ||
150 | if (access("/proc/self/ns/cgroup", F_OK) == 0) | |
151 | enabled = 1; | |
152 | else | |
153 | enabled = 0; | |
154 | ||
155 | return enabled; | |
156 | } | |
157 | ||
35d2e7ec | 158 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
7027ff61 | 159 | _cleanup_free_ char *fs = NULL; |
35d2e7ec LP |
160 | int r; |
161 | DIR *d; | |
162 | ||
35d2e7ec LP |
163 | assert(_d); |
164 | ||
165 | /* This is not recursive! */ | |
166 | ||
c3175a7f LP |
167 | r = cg_get_path(controller, path, NULL, &fs); |
168 | if (r < 0) | |
35d2e7ec LP |
169 | return r; |
170 | ||
171 | d = opendir(fs); | |
35d2e7ec LP |
172 | if (!d) |
173 | return -errno; | |
174 | ||
175 | *_d = d; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | int cg_read_subgroup(DIR *d, char **fn) { | |
180 | struct dirent *de; | |
181 | ||
182 | assert(d); | |
7027ff61 | 183 | assert(fn); |
35d2e7ec | 184 | |
f01327ad | 185 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
35d2e7ec LP |
186 | char *b; |
187 | ||
188 | if (de->d_type != DT_DIR) | |
189 | continue; | |
190 | ||
49bfc877 | 191 | if (dot_or_dot_dot(de->d_name)) |
35d2e7ec LP |
192 | continue; |
193 | ||
7027ff61 LP |
194 | b = strdup(de->d_name); |
195 | if (!b) | |
35d2e7ec LP |
196 | return -ENOMEM; |
197 | ||
198 | *fn = b; | |
199 | return 1; | |
200 | } | |
201 | ||
35d2e7ec LP |
202 | return 0; |
203 | } | |
204 | ||
4ad49000 | 205 | int cg_rmdir(const char *controller, const char *path) { |
7027ff61 | 206 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
207 | int r; |
208 | ||
ad293f5a LP |
209 | r = cg_get_path(controller, path, NULL, &p); |
210 | if (r < 0) | |
35d2e7ec LP |
211 | return r; |
212 | ||
213 | r = rmdir(p); | |
7027ff61 LP |
214 | if (r < 0 && errno != ENOENT) |
215 | return -errno; | |
35d2e7ec | 216 | |
b4cccbc1 LP |
217 | r = cg_hybrid_unified(); |
218 | if (r < 0) | |
219 | return r; | |
220 | if (r == 0) | |
221 | return 0; | |
222 | ||
223 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
224 | r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path); |
225 | if (r < 0) | |
226 | log_warning_errno(r, "Failed to remove compat systemd cgroup %s: %m", path); | |
227 | } | |
228 | ||
7027ff61 | 229 | return 0; |
35d2e7ec LP |
230 | } |
231 | ||
1d98fef1 LP |
232 | int cg_kill( |
233 | const char *controller, | |
234 | const char *path, | |
235 | int sig, | |
236 | CGroupFlags flags, | |
237 | Set *s, | |
238 | cg_kill_log_func_t log_kill, | |
239 | void *userdata) { | |
240 | ||
7027ff61 | 241 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 242 | bool done = false; |
8c6db833 | 243 | int r, ret = 0; |
35d2e7ec | 244 | pid_t my_pid; |
8c6db833 | 245 | |
8c6db833 LP |
246 | assert(sig >= 0); |
247 | ||
0d5b4810 LP |
248 | /* Don't send SIGCONT twice. Also, SIGKILL always works even when process is suspended, hence don't send |
249 | * SIGCONT on SIGKILL. */ | |
250 | if (IN_SET(sig, SIGCONT, SIGKILL)) | |
251 | flags &= ~CGROUP_SIGCONT; | |
252 | ||
8c6db833 LP |
253 | /* This goes through the tasks list and kills them all. This |
254 | * is repeated until no further processes are added to the | |
255 | * tasks list, to properly handle forking processes */ | |
256 | ||
7027ff61 | 257 | if (!s) { |
d5099efc | 258 | s = allocated_set = set_new(NULL); |
7027ff61 | 259 | if (!s) |
ca949c9d | 260 | return -ENOMEM; |
7027ff61 | 261 | } |
8c6db833 | 262 | |
df0ff127 | 263 | my_pid = getpid_cached(); |
8c6db833 LP |
264 | |
265 | do { | |
7027ff61 | 266 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 267 | pid_t pid = 0; |
8c6db833 LP |
268 | done = true; |
269 | ||
7027ff61 LP |
270 | r = cg_enumerate_processes(controller, path, &f); |
271 | if (r < 0) { | |
4c633005 | 272 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 273 | return r; |
35d2e7ec | 274 | |
7027ff61 | 275 | return ret; |
35d2e7ec | 276 | } |
c6c18be3 LP |
277 | |
278 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 279 | |
1d98fef1 | 280 | if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid) |
c6c18be3 | 281 | continue; |
8c6db833 | 282 | |
fea72cc0 | 283 | if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) |
c6c18be3 | 284 | continue; |
8c6db833 | 285 | |
1d98fef1 LP |
286 | if (log_kill) |
287 | log_kill(pid, sig, userdata); | |
288 | ||
8c6db833 LP |
289 | /* If we haven't killed this process yet, kill |
290 | * it */ | |
4c633005 LP |
291 | if (kill(pid, sig) < 0) { |
292 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 293 | ret = -errno; |
6e8314c4 | 294 | } else { |
1d98fef1 | 295 | if (flags & CGROUP_SIGCONT) |
e155a0aa | 296 | (void) kill(pid, SIGCONT); |
430c18ed | 297 | |
6e8314c4 LP |
298 | if (ret == 0) |
299 | ret = 1; | |
430c18ed | 300 | } |
8c6db833 | 301 | |
8c6db833 LP |
302 | done = false; |
303 | ||
fea72cc0 | 304 | r = set_put(s, PID_TO_PTR(pid)); |
7027ff61 | 305 | if (r < 0) { |
35d2e7ec | 306 | if (ret >= 0) |
7027ff61 | 307 | return r; |
35d2e7ec | 308 | |
7027ff61 | 309 | return ret; |
35d2e7ec LP |
310 | } |
311 | } | |
312 | ||
313 | if (r < 0) { | |
314 | if (ret >= 0) | |
7027ff61 | 315 | return r; |
35d2e7ec | 316 | |
7027ff61 | 317 | return ret; |
8c6db833 LP |
318 | } |
319 | ||
8c6db833 LP |
320 | /* To avoid racing against processes which fork |
321 | * quicker than we can kill them we repeat this until | |
322 | * no new pids need to be killed. */ | |
323 | ||
35d2e7ec | 324 | } while (!done); |
8c6db833 | 325 | |
35d2e7ec | 326 | return ret; |
8c6db833 LP |
327 | } |
328 | ||
1d98fef1 LP |
329 | int cg_kill_recursive( |
330 | const char *controller, | |
331 | const char *path, | |
332 | int sig, | |
333 | CGroupFlags flags, | |
334 | Set *s, | |
335 | cg_kill_log_func_t log_kill, | |
336 | void *userdata) { | |
337 | ||
7027ff61 LP |
338 | _cleanup_set_free_ Set *allocated_set = NULL; |
339 | _cleanup_closedir_ DIR *d = NULL; | |
e155a0aa | 340 | int r, ret; |
35d2e7ec | 341 | char *fn; |
8c6db833 LP |
342 | |
343 | assert(path); | |
8c6db833 LP |
344 | assert(sig >= 0); |
345 | ||
7027ff61 | 346 | if (!s) { |
d5099efc | 347 | s = allocated_set = set_new(NULL); |
7027ff61 | 348 | if (!s) |
ca949c9d | 349 | return -ENOMEM; |
7027ff61 | 350 | } |
ca949c9d | 351 | |
1d98fef1 | 352 | ret = cg_kill(controller, path, sig, flags, s, log_kill, userdata); |
8c6db833 | 353 | |
7027ff61 LP |
354 | r = cg_enumerate_subgroups(controller, path, &d); |
355 | if (r < 0) { | |
4c633005 | 356 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 357 | return r; |
8c6db833 | 358 | |
7027ff61 | 359 | return ret; |
35d2e7ec | 360 | } |
8c6db833 | 361 | |
35d2e7ec | 362 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 363 | _cleanup_free_ char *p = NULL; |
8c6db833 | 364 | |
605405c6 | 365 | p = strjoin(path, "/", fn); |
35d2e7ec | 366 | free(fn); |
7027ff61 LP |
367 | if (!p) |
368 | return -ENOMEM; | |
8c6db833 | 369 | |
1d98fef1 | 370 | r = cg_kill_recursive(controller, p, sig, flags, s, log_kill, userdata); |
e155a0aa | 371 | if (r != 0 && ret >= 0) |
35d2e7ec | 372 | ret = r; |
8c6db833 | 373 | } |
7027ff61 | 374 | if (ret >= 0 && r < 0) |
35d2e7ec LP |
375 | ret = r; |
376 | ||
1d98fef1 | 377 | if (flags & CGROUP_REMOVE) { |
4ad49000 | 378 | r = cg_rmdir(controller, path); |
4c701096 | 379 | if (r < 0 && ret >= 0 && !IN_SET(r, -ENOENT, -EBUSY)) |
7027ff61 LP |
380 | return r; |
381 | } | |
ca949c9d | 382 | |
8c6db833 LP |
383 | return ret; |
384 | } | |
385 | ||
1d98fef1 LP |
386 | int cg_migrate( |
387 | const char *cfrom, | |
388 | const char *pfrom, | |
389 | const char *cto, | |
390 | const char *pto, | |
391 | CGroupFlags flags) { | |
392 | ||
35d2e7ec | 393 | bool done = false; |
246aa6dd | 394 | _cleanup_set_free_ Set *s = NULL; |
8c6db833 LP |
395 | int r, ret = 0; |
396 | pid_t my_pid; | |
397 | ||
246aa6dd LP |
398 | assert(cfrom); |
399 | assert(pfrom); | |
400 | assert(cto); | |
401 | assert(pto); | |
8c6db833 | 402 | |
d5099efc | 403 | s = set_new(NULL); |
246aa6dd | 404 | if (!s) |
35d2e7ec LP |
405 | return -ENOMEM; |
406 | ||
df0ff127 | 407 | my_pid = getpid_cached(); |
8c6db833 LP |
408 | |
409 | do { | |
7027ff61 | 410 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 411 | pid_t pid = 0; |
8c6db833 LP |
412 | done = true; |
413 | ||
b043cd0b | 414 | r = cg_enumerate_processes(cfrom, pfrom, &f); |
246aa6dd | 415 | if (r < 0) { |
4c633005 | 416 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 417 | return r; |
35d2e7ec | 418 | |
246aa6dd | 419 | return ret; |
35d2e7ec | 420 | } |
c6c18be3 LP |
421 | |
422 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 423 | |
35d2e7ec LP |
424 | /* This might do weird stuff if we aren't a |
425 | * single-threaded program. However, we | |
426 | * luckily know we are not */ | |
1d98fef1 | 427 | if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid) |
c6c18be3 | 428 | continue; |
8c6db833 | 429 | |
fea72cc0 | 430 | if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) |
35d2e7ec LP |
431 | continue; |
432 | ||
9b84c7f9 LP |
433 | /* Ignore kernel threads. Since they can only |
434 | * exist in the root cgroup, we only check for | |
435 | * them there. */ | |
436 | if (cfrom && | |
437 | (isempty(pfrom) || path_equal(pfrom, "/")) && | |
438 | is_kernel_thread(pid) > 0) | |
439 | continue; | |
440 | ||
246aa6dd LP |
441 | r = cg_attach(cto, pto, pid); |
442 | if (r < 0) { | |
4c633005 | 443 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
444 | ret = r; |
445 | } else if (ret == 0) | |
446 | ret = 1; | |
8c6db833 | 447 | |
8c6db833 | 448 | done = false; |
35d2e7ec | 449 | |
fea72cc0 | 450 | r = set_put(s, PID_TO_PTR(pid)); |
246aa6dd | 451 | if (r < 0) { |
35d2e7ec | 452 | if (ret >= 0) |
7027ff61 | 453 | return r; |
35d2e7ec | 454 | |
246aa6dd | 455 | return ret; |
35d2e7ec LP |
456 | } |
457 | } | |
458 | ||
459 | if (r < 0) { | |
460 | if (ret >= 0) | |
7027ff61 | 461 | return r; |
35d2e7ec | 462 | |
246aa6dd | 463 | return ret; |
8c6db833 | 464 | } |
35d2e7ec | 465 | } while (!done); |
8c6db833 | 466 | |
35d2e7ec | 467 | return ret; |
8c6db833 LP |
468 | } |
469 | ||
4ad49000 LP |
470 | int cg_migrate_recursive( |
471 | const char *cfrom, | |
472 | const char *pfrom, | |
473 | const char *cto, | |
474 | const char *pto, | |
1d98fef1 | 475 | CGroupFlags flags) { |
4ad49000 | 476 | |
246aa6dd | 477 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 478 | int r, ret = 0; |
35d2e7ec | 479 | char *fn; |
8c6db833 | 480 | |
246aa6dd LP |
481 | assert(cfrom); |
482 | assert(pfrom); | |
483 | assert(cto); | |
484 | assert(pto); | |
8c6db833 | 485 | |
1d98fef1 | 486 | ret = cg_migrate(cfrom, pfrom, cto, pto, flags); |
8c6db833 | 487 | |
246aa6dd LP |
488 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
489 | if (r < 0) { | |
4c633005 | 490 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
491 | return r; |
492 | ||
246aa6dd | 493 | return ret; |
35d2e7ec LP |
494 | } |
495 | ||
496 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 497 | _cleanup_free_ char *p = NULL; |
8c6db833 | 498 | |
605405c6 | 499 | p = strjoin(pfrom, "/", fn); |
35d2e7ec | 500 | free(fn); |
e155a0aa LP |
501 | if (!p) |
502 | return -ENOMEM; | |
8c6db833 | 503 | |
1d98fef1 | 504 | r = cg_migrate_recursive(cfrom, p, cto, pto, flags); |
35d2e7ec LP |
505 | if (r != 0 && ret >= 0) |
506 | ret = r; | |
8c6db833 LP |
507 | } |
508 | ||
35d2e7ec LP |
509 | if (r < 0 && ret >= 0) |
510 | ret = r; | |
511 | ||
1d98fef1 | 512 | if (flags & CGROUP_REMOVE) { |
4ad49000 | 513 | r = cg_rmdir(cfrom, pfrom); |
4c701096 | 514 | if (r < 0 && ret >= 0 && !IN_SET(r, -ENOENT, -EBUSY)) |
246aa6dd LP |
515 | return r; |
516 | } | |
8c6db833 LP |
517 | |
518 | return ret; | |
519 | } | |
520 | ||
13b84ec7 LP |
521 | int cg_migrate_recursive_fallback( |
522 | const char *cfrom, | |
523 | const char *pfrom, | |
524 | const char *cto, | |
525 | const char *pto, | |
1d98fef1 | 526 | CGroupFlags flags) { |
13b84ec7 LP |
527 | |
528 | int r; | |
529 | ||
530 | assert(cfrom); | |
531 | assert(pfrom); | |
532 | assert(cto); | |
533 | assert(pto); | |
534 | ||
1d98fef1 | 535 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, flags); |
13b84ec7 LP |
536 | if (r < 0) { |
537 | char prefix[strlen(pto) + 1]; | |
538 | ||
539 | /* This didn't work? Then let's try all prefixes of the destination */ | |
540 | ||
fecffe5d | 541 | PATH_FOREACH_PREFIX(prefix, pto) { |
e155a0aa LP |
542 | int q; |
543 | ||
1d98fef1 | 544 | q = cg_migrate_recursive(cfrom, pfrom, cto, prefix, flags); |
e155a0aa LP |
545 | if (q >= 0) |
546 | return q; | |
13b84ec7 LP |
547 | } |
548 | } | |
549 | ||
e155a0aa | 550 | return r; |
13b84ec7 LP |
551 | } |
552 | ||
efdb0237 LP |
553 | static const char *controller_to_dirname(const char *controller) { |
554 | const char *e; | |
3474ae3c | 555 | |
7027ff61 LP |
556 | assert(controller); |
557 | ||
efdb0237 LP |
558 | /* Converts a controller name to the directory name below |
559 | * /sys/fs/cgroup/ we want to mount it to. Effectively, this | |
560 | * just cuts off the name= prefixed used for named | |
561 | * hierarchies, if it is specified. */ | |
562 | ||
2977724b | 563 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { |
b4cccbc1 | 564 | if (cg_hybrid_unified() > 0) |
2977724b TH |
565 | controller = SYSTEMD_CGROUP_CONTROLLER_HYBRID; |
566 | else | |
567 | controller = SYSTEMD_CGROUP_CONTROLLER_LEGACY; | |
568 | } | |
b6629c4b | 569 | |
efdb0237 LP |
570 | e = startswith(controller, "name="); |
571 | if (e) | |
572 | return e; | |
573 | ||
574 | return controller; | |
3474ae3c LP |
575 | } |
576 | ||
569b19d8 LP |
577 | static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) { |
578 | const char *dn; | |
018ef268 | 579 | char *t = NULL; |
3474ae3c | 580 | |
efdb0237 | 581 | assert(fs); |
569b19d8 LP |
582 | assert(controller); |
583 | ||
584 | dn = controller_to_dirname(controller); | |
efdb0237 LP |
585 | |
586 | if (isempty(path) && isempty(suffix)) | |
569b19d8 | 587 | t = strappend("/sys/fs/cgroup/", dn); |
efdb0237 | 588 | else if (isempty(path)) |
605405c6 | 589 | t = strjoin("/sys/fs/cgroup/", dn, "/", suffix); |
efdb0237 | 590 | else if (isempty(suffix)) |
605405c6 | 591 | t = strjoin("/sys/fs/cgroup/", dn, "/", path); |
efdb0237 | 592 | else |
605405c6 | 593 | t = strjoin("/sys/fs/cgroup/", dn, "/", path, "/", suffix); |
efdb0237 LP |
594 | if (!t) |
595 | return -ENOMEM; | |
3474ae3c | 596 | |
efdb0237 LP |
597 | *fs = t; |
598 | return 0; | |
599 | } | |
600 | ||
601 | static int join_path_unified(const char *path, const char *suffix, char **fs) { | |
602 | char *t; | |
603 | ||
604 | assert(fs); | |
605 | ||
606 | if (isempty(path) && isempty(suffix)) | |
607 | t = strdup("/sys/fs/cgroup"); | |
608 | else if (isempty(path)) | |
609 | t = strappend("/sys/fs/cgroup/", suffix); | |
610 | else if (isempty(suffix)) | |
611 | t = strappend("/sys/fs/cgroup/", path); | |
612 | else | |
605405c6 | 613 | t = strjoin("/sys/fs/cgroup/", path, "/", suffix); |
3474ae3c LP |
614 | if (!t) |
615 | return -ENOMEM; | |
616 | ||
efdb0237 | 617 | *fs = t; |
3474ae3c LP |
618 | return 0; |
619 | } | |
620 | ||
8c6db833 | 621 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
415fc41c | 622 | int r; |
8c6db833 | 623 | |
dbd821ac LP |
624 | assert(fs); |
625 | ||
efdb0237 LP |
626 | if (!controller) { |
627 | char *t; | |
628 | ||
569b19d8 LP |
629 | /* If no controller is specified, we return the path |
630 | * *below* the controllers, without any prefix. */ | |
efdb0237 LP |
631 | |
632 | if (!path && !suffix) | |
633 | return -EINVAL; | |
634 | ||
989189ea | 635 | if (!suffix) |
efdb0237 | 636 | t = strdup(path); |
989189ea | 637 | else if (!path) |
efdb0237 LP |
638 | t = strdup(suffix); |
639 | else | |
605405c6 | 640 | t = strjoin(path, "/", suffix); |
efdb0237 LP |
641 | if (!t) |
642 | return -ENOMEM; | |
643 | ||
644 | *fs = path_kill_slashes(t); | |
645 | return 0; | |
646 | } | |
647 | ||
648 | if (!cg_controller_is_valid(controller)) | |
78edb35a LP |
649 | return -EINVAL; |
650 | ||
b4cccbc1 LP |
651 | r = cg_all_unified(); |
652 | if (r < 0) | |
653 | return r; | |
654 | if (r > 0) | |
efdb0237 | 655 | r = join_path_unified(path, suffix, fs); |
569b19d8 LP |
656 | else |
657 | r = join_path_legacy(controller, path, suffix, fs); | |
efdb0237 LP |
658 | if (r < 0) |
659 | return r; | |
7027ff61 | 660 | |
efdb0237 LP |
661 | path_kill_slashes(*fs); |
662 | return 0; | |
3474ae3c | 663 | } |
dbd821ac | 664 | |
efdb0237 | 665 | static int controller_is_accessible(const char *controller) { |
b4cccbc1 | 666 | int r; |
37099707 | 667 | |
efdb0237 | 668 | assert(controller); |
37099707 | 669 | |
efdb0237 LP |
670 | /* Checks whether a specific controller is accessible, |
671 | * i.e. its hierarchy mounted. In the unified hierarchy all | |
672 | * controllers are considered accessible, except for the named | |
673 | * hierarchies */ | |
b12afc8c | 674 | |
efdb0237 LP |
675 | if (!cg_controller_is_valid(controller)) |
676 | return -EINVAL; | |
677 | ||
b4cccbc1 LP |
678 | r = cg_all_unified(); |
679 | if (r < 0) | |
680 | return r; | |
681 | if (r > 0) { | |
efdb0237 LP |
682 | /* We don't support named hierarchies if we are using |
683 | * the unified hierarchy. */ | |
684 | ||
685 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
686 | return 0; | |
687 | ||
688 | if (startswith(controller, "name=")) | |
689 | return -EOPNOTSUPP; | |
690 | ||
691 | } else { | |
692 | const char *cc, *dn; | |
693 | ||
694 | dn = controller_to_dirname(controller); | |
695 | cc = strjoina("/sys/fs/cgroup/", dn); | |
696 | ||
697 | if (laccess(cc, F_OK) < 0) | |
698 | return -errno; | |
699 | } | |
37099707 LP |
700 | |
701 | return 0; | |
702 | } | |
703 | ||
3474ae3c | 704 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
37099707 | 705 | int r; |
dbd821ac | 706 | |
efdb0237 | 707 | assert(controller); |
3474ae3c | 708 | assert(fs); |
70132bd0 | 709 | |
efdb0237 LP |
710 | /* Check if the specified controller is actually accessible */ |
711 | r = controller_is_accessible(controller); | |
37099707 LP |
712 | if (r < 0) |
713 | return r; | |
3474ae3c | 714 | |
efdb0237 | 715 | return cg_get_path(controller, path, suffix, fs); |
8c6db833 LP |
716 | } |
717 | ||
e27796a0 | 718 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
4ad49000 LP |
719 | assert(path); |
720 | assert(sb); | |
721 | assert(ftwbuf); | |
e27796a0 LP |
722 | |
723 | if (typeflag != FTW_DP) | |
724 | return 0; | |
725 | ||
726 | if (ftwbuf->level < 1) | |
727 | return 0; | |
728 | ||
e155a0aa | 729 | (void) rmdir(path); |
e27796a0 LP |
730 | return 0; |
731 | } | |
732 | ||
8c6db833 | 733 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 734 | _cleanup_free_ char *fs = NULL; |
2977724b | 735 | int r = 0, q; |
8c6db833 | 736 | |
8c6db833 LP |
737 | assert(path); |
738 | ||
e27796a0 LP |
739 | r = cg_get_path(controller, path, NULL, &fs); |
740 | if (r < 0) | |
8c6db833 LP |
741 | return r; |
742 | ||
e27796a0 | 743 | errno = 0; |
e155a0aa LP |
744 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) { |
745 | if (errno == ENOENT) | |
746 | r = 0; | |
b3267152 | 747 | else if (errno > 0) |
e155a0aa LP |
748 | r = -errno; |
749 | else | |
750 | r = -EIO; | |
751 | } | |
e27796a0 LP |
752 | |
753 | if (delete_root) { | |
4ad49000 LP |
754 | if (rmdir(fs) < 0 && errno != ENOENT) |
755 | return -errno; | |
e27796a0 LP |
756 | } |
757 | ||
b4cccbc1 LP |
758 | q = cg_hybrid_unified(); |
759 | if (q < 0) | |
760 | return q; | |
761 | if (q > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
762 | q = cg_trim(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, delete_root); |
763 | if (q < 0) | |
764 | log_warning_errno(q, "Failed to trim compat systemd cgroup %s: %m", path); | |
765 | } | |
766 | ||
e27796a0 | 767 | return r; |
8c6db833 LP |
768 | } |
769 | ||
1434ae6f LP |
770 | int cg_create(const char *controller, const char *path) { |
771 | _cleanup_free_ char *fs = NULL; | |
772 | int r; | |
773 | ||
774 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
775 | if (r < 0) | |
776 | return r; | |
777 | ||
778 | r = mkdir_parents(fs, 0755); | |
779 | if (r < 0) | |
780 | return r; | |
781 | ||
782 | if (mkdir(fs, 0755) < 0) { | |
783 | ||
784 | if (errno == EEXIST) | |
785 | return 0; | |
786 | ||
787 | return -errno; | |
788 | } | |
789 | ||
b4cccbc1 LP |
790 | r = cg_hybrid_unified(); |
791 | if (r < 0) | |
792 | return r; | |
793 | ||
794 | if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
795 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path); |
796 | if (r < 0) | |
797 | log_warning_errno(r, "Failed to create compat systemd cgroup %s: %m", path); | |
798 | } | |
799 | ||
1434ae6f LP |
800 | return 1; |
801 | } | |
802 | ||
803 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
804 | int r, q; | |
805 | ||
806 | assert(pid >= 0); | |
807 | ||
808 | r = cg_create(controller, path); | |
809 | if (r < 0) | |
810 | return r; | |
811 | ||
812 | q = cg_attach(controller, path, pid); | |
813 | if (q < 0) | |
814 | return q; | |
815 | ||
816 | /* This does not remove the cgroup on failure */ | |
817 | return r; | |
818 | } | |
819 | ||
8c6db833 | 820 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
821 | _cleanup_free_ char *fs = NULL; |
822 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
823 | int r; |
824 | ||
8c6db833 LP |
825 | assert(path); |
826 | assert(pid >= 0); | |
827 | ||
b043cd0b | 828 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
3474ae3c | 829 | if (r < 0) |
c6c18be3 | 830 | return r; |
8c6db833 LP |
831 | |
832 | if (pid == 0) | |
df0ff127 | 833 | pid = getpid_cached(); |
8c6db833 | 834 | |
d054f0a4 | 835 | xsprintf(c, PID_FMT "\n", pid); |
8c6db833 | 836 | |
2977724b TH |
837 | r = write_string_file(fs, c, 0); |
838 | if (r < 0) | |
839 | return r; | |
840 | ||
b4cccbc1 LP |
841 | r = cg_hybrid_unified(); |
842 | if (r < 0) | |
843 | return r; | |
844 | ||
845 | if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
846 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, pid); |
847 | if (r < 0) | |
bd68e99b | 848 | log_warning_errno(r, "Failed to attach "PID_FMT" to compat systemd cgroup %s: %m", pid, path); |
2977724b TH |
849 | } |
850 | ||
851 | return 0; | |
8c6db833 LP |
852 | } |
853 | ||
13b84ec7 LP |
854 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
855 | int r; | |
856 | ||
857 | assert(controller); | |
858 | assert(path); | |
859 | assert(pid >= 0); | |
860 | ||
861 | r = cg_attach(controller, path, pid); | |
862 | if (r < 0) { | |
863 | char prefix[strlen(path) + 1]; | |
864 | ||
865 | /* This didn't work? Then let's try all prefixes of | |
866 | * the destination */ | |
867 | ||
fecffe5d | 868 | PATH_FOREACH_PREFIX(prefix, path) { |
e155a0aa LP |
869 | int q; |
870 | ||
871 | q = cg_attach(controller, prefix, pid); | |
872 | if (q >= 0) | |
873 | return q; | |
13b84ec7 LP |
874 | } |
875 | } | |
876 | ||
e155a0aa | 877 | return r; |
13b84ec7 LP |
878 | } |
879 | ||
62b9bb26 | 880 | int cg_set_access( |
2d76d14e LP |
881 | const char *controller, |
882 | const char *path, | |
2d76d14e LP |
883 | uid_t uid, |
884 | gid_t gid) { | |
885 | ||
62b9bb26 LP |
886 | struct Attribute { |
887 | const char *name; | |
888 | bool fatal; | |
889 | }; | |
890 | ||
891 | /* cgroupsv1, aka legacy/non-unified */ | |
892 | static const struct Attribute legacy_attributes[] = { | |
893 | { "cgroup.procs", true }, | |
894 | { "tasks", false }, | |
895 | { "cgroup.clone_children", false }, | |
896 | {}, | |
897 | }; | |
898 | ||
899 | /* cgroupsv2, aka unified */ | |
900 | static const struct Attribute unified_attributes[] = { | |
901 | { "cgroup.procs", true }, | |
902 | { "cgroup.subtree_control", true }, | |
903 | { "cgroup.threads", false }, | |
904 | {}, | |
905 | }; | |
906 | ||
907 | static const struct Attribute* const attributes[] = { | |
908 | [false] = legacy_attributes, | |
909 | [true] = unified_attributes, | |
910 | }; | |
974efc46 | 911 | |
40853aa5 | 912 | _cleanup_free_ char *fs = NULL; |
62b9bb26 LP |
913 | const struct Attribute *i; |
914 | int r, unified; | |
8c6db833 | 915 | |
8c6db833 LP |
916 | assert(path); |
917 | ||
62b9bb26 | 918 | if (uid == UID_INVALID && gid == GID_INVALID) |
8d53b453 LP |
919 | return 0; |
920 | ||
62b9bb26 LP |
921 | unified = cg_unified_controller(controller); |
922 | if (unified < 0) | |
923 | return unified; | |
8c6db833 | 924 | |
62b9bb26 LP |
925 | /* Configure access to the cgroup itself */ |
926 | r = cg_get_path(controller, path, NULL, &fs); | |
974efc46 LP |
927 | if (r < 0) |
928 | return r; | |
8c6db833 | 929 | |
62b9bb26 | 930 | r = chmod_and_chown(fs, 0755, uid, gid); |
b4cccbc1 LP |
931 | if (r < 0) |
932 | return r; | |
40853aa5 | 933 | |
62b9bb26 LP |
934 | /* Configure access to the cgroup's attributes */ |
935 | for (i = attributes[unified]; i->name; i++) { | |
40853aa5 | 936 | fs = mfree(fs); |
40853aa5 | 937 | |
62b9bb26 | 938 | r = cg_get_path(controller, path, i->name, &fs); |
40853aa5 LP |
939 | if (r < 0) |
940 | return r; | |
efdb0237 | 941 | |
62b9bb26 LP |
942 | r = chmod_and_chown(fs, 0644, uid, gid); |
943 | if (r < 0) { | |
944 | if (i->fatal) | |
945 | return r; | |
5beac75e | 946 | |
62b9bb26 LP |
947 | log_debug_errno(r, "Failed to set access on cgroup %s, ignoring: %m", fs); |
948 | } | |
949 | } | |
950 | ||
951 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
952 | r = cg_hybrid_unified(); | |
2977724b | 953 | if (r < 0) |
62b9bb26 LP |
954 | return r; |
955 | if (r > 0) { | |
956 | /* Always propagate access mode from unified to legacy controller */ | |
957 | r = cg_set_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, uid, gid); | |
958 | if (r < 0) | |
959 | log_debug_errno(r, "Failed to set access on compatibility systemd cgroup %s, ignoring: %m", path); | |
960 | } | |
2977724b | 961 | } |
974efc46 | 962 | |
efdb0237 | 963 | return 0; |
8c6db833 LP |
964 | } |
965 | ||
4b58153d LP |
966 | int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags) { |
967 | _cleanup_free_ char *fs = NULL; | |
968 | int r; | |
969 | ||
970 | assert(path); | |
971 | assert(name); | |
972 | assert(value || size <= 0); | |
973 | ||
974 | r = cg_get_path(controller, path, NULL, &fs); | |
975 | if (r < 0) | |
976 | return r; | |
977 | ||
978 | if (setxattr(fs, name, value, size, flags) < 0) | |
979 | return -errno; | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
984 | int cg_get_xattr(const char *controller, const char *path, const char *name, void *value, size_t size) { | |
985 | _cleanup_free_ char *fs = NULL; | |
986 | ssize_t n; | |
987 | int r; | |
988 | ||
989 | assert(path); | |
990 | assert(name); | |
991 | ||
992 | r = cg_get_path(controller, path, NULL, &fs); | |
993 | if (r < 0) | |
994 | return r; | |
995 | ||
996 | n = getxattr(fs, name, value, size); | |
997 | if (n < 0) | |
998 | return -errno; | |
999 | ||
1000 | return (int) n; | |
1001 | } | |
1002 | ||
7027ff61 | 1003 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
7027ff61 LP |
1004 | _cleanup_fclose_ FILE *f = NULL; |
1005 | char line[LINE_MAX]; | |
b6629c4b | 1006 | const char *fs, *controller_str; |
efdb0237 | 1007 | size_t cs = 0; |
b4cccbc1 | 1008 | int unified; |
8c6db833 | 1009 | |
8c6db833 | 1010 | assert(path); |
c6c18be3 | 1011 | assert(pid >= 0); |
8c6db833 | 1012 | |
5da38d07 TH |
1013 | if (controller) { |
1014 | if (!cg_controller_is_valid(controller)) | |
1015 | return -EINVAL; | |
1016 | } else | |
1017 | controller = SYSTEMD_CGROUP_CONTROLLER; | |
1018 | ||
c22800e4 | 1019 | unified = cg_unified_controller(controller); |
b4cccbc1 LP |
1020 | if (unified < 0) |
1021 | return unified; | |
1022 | if (unified == 0) { | |
b6629c4b TH |
1023 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
1024 | controller_str = SYSTEMD_CGROUP_CONTROLLER_LEGACY; | |
1025 | else | |
1026 | controller_str = controller; | |
1027 | ||
1028 | cs = strlen(controller_str); | |
1029 | } | |
7027ff61 | 1030 | |
b68fa010 | 1031 | fs = procfs_file_alloca(pid, "cgroup"); |
c6c18be3 | 1032 | f = fopen(fs, "re"); |
4c633005 LP |
1033 | if (!f) |
1034 | return errno == ENOENT ? -ESRCH : -errno; | |
1035 | ||
35bbbf85 LP |
1036 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
1037 | ||
7027ff61 | 1038 | FOREACH_LINE(line, f, return -errno) { |
efdb0237 | 1039 | char *e, *p; |
c6c18be3 LP |
1040 | |
1041 | truncate_nl(line); | |
1042 | ||
efdb0237 LP |
1043 | if (unified) { |
1044 | e = startswith(line, "0:"); | |
1045 | if (!e) | |
1046 | continue; | |
c6c18be3 | 1047 | |
efdb0237 LP |
1048 | e = strchr(e, ':'); |
1049 | if (!e) | |
1050 | continue; | |
1051 | } else { | |
1052 | char *l; | |
1053 | size_t k; | |
1054 | const char *word, *state; | |
1055 | bool found = false; | |
1056 | ||
1057 | l = strchr(line, ':'); | |
1058 | if (!l) | |
1059 | continue; | |
8af8afd6 | 1060 | |
efdb0237 LP |
1061 | l++; |
1062 | e = strchr(l, ':'); | |
1063 | if (!e) | |
1064 | continue; | |
8af8afd6 | 1065 | |
efdb0237 LP |
1066 | *e = 0; |
1067 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { | |
b6629c4b | 1068 | if (k == cs && memcmp(word, controller_str, cs) == 0) { |
efdb0237 LP |
1069 | found = true; |
1070 | break; | |
1071 | } | |
8af8afd6 LP |
1072 | } |
1073 | ||
efdb0237 LP |
1074 | if (!found) |
1075 | continue; | |
8af8afd6 LP |
1076 | } |
1077 | ||
8af8afd6 | 1078 | p = strdup(e + 1); |
7027ff61 LP |
1079 | if (!p) |
1080 | return -ENOMEM; | |
c6c18be3 | 1081 | |
5e20b0a4 LP |
1082 | /* Truncate suffix indicating the process is a zombie */ |
1083 | e = endswith(p, " (deleted)"); | |
1084 | if (e) | |
1085 | *e = 0; | |
1086 | ||
c6c18be3 | 1087 | *path = p; |
7027ff61 | 1088 | return 0; |
c6c18be3 LP |
1089 | } |
1090 | ||
1c80e425 | 1091 | return -ENODATA; |
8c6db833 LP |
1092 | } |
1093 | ||
1094 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 | 1095 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
efdb0237 | 1096 | const char *sc; |
415fc41c | 1097 | int r; |
8c6db833 | 1098 | |
8c6db833 LP |
1099 | assert(agent); |
1100 | ||
c22800e4 | 1101 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
1102 | if (r < 0) |
1103 | return r; | |
1104 | if (r > 0) /* doesn't apply to unified hierarchy */ | |
efdb0237 LP |
1105 | return -EOPNOTSUPP; |
1106 | ||
7027ff61 LP |
1107 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
1108 | if (r < 0) | |
c6c18be3 | 1109 | return r; |
8c6db833 | 1110 | |
7027ff61 LP |
1111 | r = read_one_line_file(fs, &contents); |
1112 | if (r < 0) | |
1113 | return r; | |
8c6db833 LP |
1114 | |
1115 | sc = strstrip(contents); | |
e155a0aa | 1116 | if (isempty(sc)) { |
4c1fc3e4 | 1117 | r = write_string_file(fs, agent, 0); |
574d5f2d | 1118 | if (r < 0) |
7027ff61 | 1119 | return r; |
b8725df8 | 1120 | } else if (!path_equal(sc, agent)) |
7027ff61 | 1121 | return -EEXIST; |
8c6db833 | 1122 | |
0da16248 | 1123 | fs = mfree(fs); |
7027ff61 LP |
1124 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
1125 | if (r < 0) | |
1126 | return r; | |
8c6db833 | 1127 | |
0da16248 | 1128 | contents = mfree(contents); |
7027ff61 LP |
1129 | r = read_one_line_file(fs, &contents); |
1130 | if (r < 0) | |
1131 | return r; | |
8c6db833 LP |
1132 | |
1133 | sc = strstrip(contents); | |
8c6db833 | 1134 | if (streq(sc, "0")) { |
4c1fc3e4 | 1135 | r = write_string_file(fs, "1", 0); |
7027ff61 LP |
1136 | if (r < 0) |
1137 | return r; | |
c6c18be3 | 1138 | |
7027ff61 LP |
1139 | return 1; |
1140 | } | |
8c6db833 | 1141 | |
7027ff61 LP |
1142 | if (!streq(sc, "1")) |
1143 | return -EIO; | |
8c6db833 | 1144 | |
7027ff61 | 1145 | return 0; |
8c6db833 LP |
1146 | } |
1147 | ||
ad929bcc KS |
1148 | int cg_uninstall_release_agent(const char *controller) { |
1149 | _cleanup_free_ char *fs = NULL; | |
415fc41c | 1150 | int r; |
efdb0237 | 1151 | |
c22800e4 | 1152 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
1153 | if (r < 0) |
1154 | return r; | |
1155 | if (r > 0) /* Doesn't apply to unified hierarchy */ | |
efdb0237 | 1156 | return -EOPNOTSUPP; |
ad929bcc | 1157 | |
ac9ef333 LP |
1158 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
1159 | if (r < 0) | |
1160 | return r; | |
1161 | ||
4c1fc3e4 | 1162 | r = write_string_file(fs, "0", 0); |
ac9ef333 LP |
1163 | if (r < 0) |
1164 | return r; | |
1165 | ||
0da16248 | 1166 | fs = mfree(fs); |
ac9ef333 | 1167 | |
ad929bcc KS |
1168 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
1169 | if (r < 0) | |
1170 | return r; | |
1171 | ||
4c1fc3e4 | 1172 | r = write_string_file(fs, "", 0); |
ad929bcc KS |
1173 | if (r < 0) |
1174 | return r; | |
1175 | ||
ac9ef333 | 1176 | return 0; |
ad929bcc KS |
1177 | } |
1178 | ||
6f883237 | 1179 | int cg_is_empty(const char *controller, const char *path) { |
7027ff61 | 1180 | _cleanup_fclose_ FILE *f = NULL; |
efdb0237 | 1181 | pid_t pid; |
7027ff61 | 1182 | int r; |
8c6db833 | 1183 | |
8c6db833 LP |
1184 | assert(path); |
1185 | ||
b043cd0b | 1186 | r = cg_enumerate_processes(controller, path, &f); |
6f883237 LP |
1187 | if (r == -ENOENT) |
1188 | return 1; | |
c3175a7f | 1189 | if (r < 0) |
6f883237 | 1190 | return r; |
8c6db833 | 1191 | |
6f883237 | 1192 | r = cg_read_pid(f, &pid); |
c6c18be3 LP |
1193 | if (r < 0) |
1194 | return r; | |
8c6db833 | 1195 | |
6f883237 | 1196 | return r == 0; |
8c6db833 LP |
1197 | } |
1198 | ||
6f883237 | 1199 | int cg_is_empty_recursive(const char *controller, const char *path) { |
415fc41c | 1200 | int r; |
8c6db833 | 1201 | |
8c6db833 LP |
1202 | assert(path); |
1203 | ||
6fd66507 LP |
1204 | /* The root cgroup is always populated */ |
1205 | if (controller && (isempty(path) || path_equal(path, "/"))) | |
efdb0237 | 1206 | return false; |
6fd66507 | 1207 | |
c22800e4 | 1208 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
1209 | if (r < 0) |
1210 | return r; | |
1211 | if (r > 0) { | |
ab2c3861 | 1212 | _cleanup_free_ char *t = NULL; |
8c6db833 | 1213 | |
efdb0237 | 1214 | /* On the unified hierarchy we can check empty state |
ab2c3861 | 1215 | * via the "populated" attribute of "cgroup.events". */ |
8c6db833 | 1216 | |
ab2c3861 | 1217 | r = cg_read_event(controller, path, "populated", &t); |
efdb0237 LP |
1218 | if (r < 0) |
1219 | return r; | |
1220 | ||
1221 | return streq(t, "0"); | |
1222 | } else { | |
1223 | _cleanup_closedir_ DIR *d = NULL; | |
1224 | char *fn; | |
8c6db833 | 1225 | |
efdb0237 | 1226 | r = cg_is_empty(controller, path); |
35d2e7ec | 1227 | if (r <= 0) |
7027ff61 | 1228 | return r; |
35d2e7ec | 1229 | |
efdb0237 LP |
1230 | r = cg_enumerate_subgroups(controller, path, &d); |
1231 | if (r == -ENOENT) | |
1232 | return 1; | |
1233 | if (r < 0) | |
1234 | return r; | |
35d2e7ec | 1235 | |
efdb0237 LP |
1236 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
1237 | _cleanup_free_ char *p = NULL; | |
1238 | ||
605405c6 | 1239 | p = strjoin(path, "/", fn); |
efdb0237 LP |
1240 | free(fn); |
1241 | if (!p) | |
1242 | return -ENOMEM; | |
1243 | ||
1244 | r = cg_is_empty_recursive(controller, p); | |
1245 | if (r <= 0) | |
1246 | return r; | |
1247 | } | |
1248 | if (r < 0) | |
1249 | return r; | |
1250 | ||
1251 | return true; | |
1252 | } | |
35d2e7ec LP |
1253 | } |
1254 | ||
1255 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
35d2e7ec | 1256 | char *t = NULL, *u = NULL; |
efdb0237 | 1257 | const char *e; |
35d2e7ec LP |
1258 | |
1259 | assert(spec); | |
35d2e7ec LP |
1260 | |
1261 | if (*spec == '/') { | |
99be45a4 | 1262 | if (!path_is_normalized(spec)) |
e884315e | 1263 | return -EINVAL; |
35d2e7ec LP |
1264 | |
1265 | if (path) { | |
246aa6dd LP |
1266 | t = strdup(spec); |
1267 | if (!t) | |
35d2e7ec LP |
1268 | return -ENOMEM; |
1269 | ||
dbb9401d | 1270 | *path = path_kill_slashes(t); |
8c6db833 LP |
1271 | } |
1272 | ||
35d2e7ec LP |
1273 | if (controller) |
1274 | *controller = NULL; | |
1275 | ||
1276 | return 0; | |
8c6db833 LP |
1277 | } |
1278 | ||
246aa6dd LP |
1279 | e = strchr(spec, ':'); |
1280 | if (!e) { | |
185a0874 | 1281 | if (!cg_controller_is_valid(spec)) |
35d2e7ec LP |
1282 | return -EINVAL; |
1283 | ||
1284 | if (controller) { | |
efdb0237 | 1285 | t = strdup(spec); |
246aa6dd | 1286 | if (!t) |
35d2e7ec LP |
1287 | return -ENOMEM; |
1288 | ||
1289 | *controller = t; | |
1290 | } | |
1291 | ||
1292 | if (path) | |
1293 | *path = NULL; | |
1294 | ||
1295 | return 0; | |
8c6db833 LP |
1296 | } |
1297 | ||
efdb0237 | 1298 | t = strndup(spec, e-spec); |
e884315e LP |
1299 | if (!t) |
1300 | return -ENOMEM; | |
185a0874 | 1301 | if (!cg_controller_is_valid(t)) { |
e884315e | 1302 | free(t); |
35d2e7ec | 1303 | return -EINVAL; |
246aa6dd LP |
1304 | } |
1305 | ||
efdb0237 LP |
1306 | if (isempty(e+1)) |
1307 | u = NULL; | |
1308 | else { | |
baa89da4 LP |
1309 | u = strdup(e+1); |
1310 | if (!u) { | |
1311 | free(t); | |
1312 | return -ENOMEM; | |
1313 | } | |
35d2e7ec | 1314 | |
99be45a4 | 1315 | if (!path_is_normalized(u) || |
baa89da4 LP |
1316 | !path_is_absolute(u)) { |
1317 | free(t); | |
1318 | free(u); | |
1319 | return -EINVAL; | |
1320 | } | |
1321 | ||
1322 | path_kill_slashes(u); | |
1323 | } | |
5954c074 | 1324 | |
35d2e7ec LP |
1325 | if (controller) |
1326 | *controller = t; | |
e884315e LP |
1327 | else |
1328 | free(t); | |
35d2e7ec LP |
1329 | |
1330 | if (path) | |
1331 | *path = u; | |
e884315e LP |
1332 | else |
1333 | free(u); | |
35d2e7ec LP |
1334 | |
1335 | return 0; | |
8c6db833 | 1336 | } |
c6c18be3 | 1337 | |
7027ff61 | 1338 | int cg_mangle_path(const char *path, char **result) { |
78edb35a LP |
1339 | _cleanup_free_ char *c = NULL, *p = NULL; |
1340 | char *t; | |
35d2e7ec LP |
1341 | int r; |
1342 | ||
1343 | assert(path); | |
1344 | assert(result); | |
1345 | ||
73e231ab | 1346 | /* First, check if it already is a filesystem path */ |
7027ff61 | 1347 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 1348 | |
b69d29ce LP |
1349 | t = strdup(path); |
1350 | if (!t) | |
35d2e7ec LP |
1351 | return -ENOMEM; |
1352 | ||
dbb9401d | 1353 | *result = path_kill_slashes(t); |
35d2e7ec LP |
1354 | return 0; |
1355 | } | |
1356 | ||
73e231ab | 1357 | /* Otherwise, treat it as cg spec */ |
b69d29ce LP |
1358 | r = cg_split_spec(path, &c, &p); |
1359 | if (r < 0) | |
35d2e7ec LP |
1360 | return r; |
1361 | ||
efdb0237 | 1362 | return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result); |
35d2e7ec | 1363 | } |
1f73f0f1 | 1364 | |
7027ff61 | 1365 | int cg_get_root_path(char **path) { |
9444b1f2 | 1366 | char *p, *e; |
7027ff61 LP |
1367 | int r; |
1368 | ||
1369 | assert(path); | |
1370 | ||
9444b1f2 | 1371 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1372 | if (r < 0) |
1373 | return r; | |
1374 | ||
efdb0237 LP |
1375 | e = endswith(p, "/" SPECIAL_INIT_SCOPE); |
1376 | if (!e) | |
1377 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */ | |
1378 | if (!e) | |
1379 | e = endswith(p, "/system"); /* even more legacy */ | |
9444b1f2 | 1380 | if (e) |
7027ff61 LP |
1381 | *e = 0; |
1382 | ||
1f73f0f1 LP |
1383 | *path = p; |
1384 | return 0; | |
1385 | } | |
b59e2465 | 1386 | |
751bc6ac LP |
1387 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
1388 | _cleanup_free_ char *rt = NULL; | |
1389 | char *p; | |
ba1261bc LP |
1390 | int r; |
1391 | ||
e9174f29 | 1392 | assert(cgroup); |
751bc6ac | 1393 | assert(shifted); |
e9174f29 LP |
1394 | |
1395 | if (!root) { | |
1396 | /* If the root was specified let's use that, otherwise | |
1397 | * let's determine it from PID 1 */ | |
1398 | ||
751bc6ac | 1399 | r = cg_get_root_path(&rt); |
e9174f29 LP |
1400 | if (r < 0) |
1401 | return r; | |
1402 | ||
751bc6ac | 1403 | root = rt; |
e9174f29 | 1404 | } |
ba1261bc | 1405 | |
751bc6ac | 1406 | p = path_startswith(cgroup, root); |
efdb0237 | 1407 | if (p && p > cgroup) |
751bc6ac LP |
1408 | *shifted = p - 1; |
1409 | else | |
1410 | *shifted = cgroup; | |
1411 | ||
1412 | return 0; | |
1413 | } | |
1414 | ||
1415 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { | |
1416 | _cleanup_free_ char *raw = NULL; | |
1417 | const char *c; | |
1418 | int r; | |
1419 | ||
1420 | assert(pid >= 0); | |
1421 | assert(cgroup); | |
1422 | ||
1423 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
7027ff61 | 1424 | if (r < 0) |
ba1261bc | 1425 | return r; |
ba1261bc | 1426 | |
751bc6ac LP |
1427 | r = cg_shift_path(raw, root, &c); |
1428 | if (r < 0) | |
1429 | return r; | |
ba1261bc | 1430 | |
751bc6ac LP |
1431 | if (c == raw) { |
1432 | *cgroup = raw; | |
1433 | raw = NULL; | |
1434 | } else { | |
1435 | char *n; | |
ba1261bc | 1436 | |
751bc6ac LP |
1437 | n = strdup(c); |
1438 | if (!n) | |
ba1261bc | 1439 | return -ENOMEM; |
ba1261bc | 1440 | |
751bc6ac LP |
1441 | *cgroup = n; |
1442 | } | |
ba1261bc LP |
1443 | |
1444 | return 0; | |
1445 | } | |
1446 | ||
9ed794a3 | 1447 | int cg_path_decode_unit(const char *cgroup, char **unit) { |
8b0849e9 LP |
1448 | char *c, *s; |
1449 | size_t n; | |
ef1673d1 MT |
1450 | |
1451 | assert(cgroup); | |
6c03089c | 1452 | assert(unit); |
ef1673d1 | 1453 | |
8b0849e9 LP |
1454 | n = strcspn(cgroup, "/"); |
1455 | if (n < 3) | |
1456 | return -ENXIO; | |
1457 | ||
1458 | c = strndupa(cgroup, n); | |
ae018d9b | 1459 | c = cg_unescape(c); |
ef1673d1 | 1460 | |
7410616c | 1461 | if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) |
cfeaa44a | 1462 | return -ENXIO; |
ef1673d1 | 1463 | |
d7bd3de0 | 1464 | s = strdup(c); |
6c03089c LP |
1465 | if (!s) |
1466 | return -ENOMEM; | |
1467 | ||
1468 | *unit = s; | |
ef1673d1 MT |
1469 | return 0; |
1470 | } | |
1471 | ||
8b0849e9 LP |
1472 | static bool valid_slice_name(const char *p, size_t n) { |
1473 | ||
1474 | if (!p) | |
1475 | return false; | |
1476 | ||
fbd0b64f | 1477 | if (n < STRLEN("x.slice")) |
8b0849e9 LP |
1478 | return false; |
1479 | ||
1480 | if (memcmp(p + n - 6, ".slice", 6) == 0) { | |
1481 | char buf[n+1], *c; | |
1482 | ||
1483 | memcpy(buf, p, n); | |
1484 | buf[n] = 0; | |
1485 | ||
1486 | c = cg_unescape(buf); | |
1487 | ||
7410616c | 1488 | return unit_name_is_valid(c, UNIT_NAME_PLAIN); |
8b0849e9 LP |
1489 | } |
1490 | ||
1491 | return false; | |
1492 | } | |
1493 | ||
9444b1f2 | 1494 | static const char *skip_slices(const char *p) { |
8b0849e9 LP |
1495 | assert(p); |
1496 | ||
9444b1f2 LP |
1497 | /* Skips over all slice assignments */ |
1498 | ||
1499 | for (;;) { | |
1021b21b LP |
1500 | size_t n; |
1501 | ||
9444b1f2 LP |
1502 | p += strspn(p, "/"); |
1503 | ||
1504 | n = strcspn(p, "/"); | |
8b0849e9 | 1505 | if (!valid_slice_name(p, n)) |
9444b1f2 LP |
1506 | return p; |
1507 | ||
1508 | p += n; | |
1509 | } | |
1510 | } | |
1511 | ||
8b0849e9 | 1512 | int cg_path_get_unit(const char *path, char **ret) { |
6c03089c | 1513 | const char *e; |
8b0849e9 LP |
1514 | char *unit; |
1515 | int r; | |
6c03089c LP |
1516 | |
1517 | assert(path); | |
8b0849e9 | 1518 | assert(ret); |
6c03089c | 1519 | |
9444b1f2 | 1520 | e = skip_slices(path); |
6c03089c | 1521 | |
8b0849e9 LP |
1522 | r = cg_path_decode_unit(e, &unit); |
1523 | if (r < 0) | |
1524 | return r; | |
1525 | ||
1526 | /* We skipped over the slices, don't accept any now */ | |
1527 | if (endswith(unit, ".slice")) { | |
1528 | free(unit); | |
1529 | return -ENXIO; | |
1530 | } | |
1531 | ||
1532 | *ret = unit; | |
1533 | return 0; | |
6c03089c LP |
1534 | } |
1535 | ||
1536 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
7fd1b19b | 1537 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1538 | int r; |
ba1261bc | 1539 | |
ef1673d1 MT |
1540 | assert(unit); |
1541 | ||
7027ff61 | 1542 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1543 | if (r < 0) |
1544 | return r; | |
1545 | ||
6c03089c LP |
1546 | return cg_path_get_unit(cgroup, unit); |
1547 | } | |
ef1673d1 | 1548 | |
d4fffc4b ZJS |
1549 | /** |
1550 | * Skip session-*.scope, but require it to be there. | |
1551 | */ | |
9444b1f2 LP |
1552 | static const char *skip_session(const char *p) { |
1553 | size_t n; | |
1554 | ||
8b0849e9 LP |
1555 | if (isempty(p)) |
1556 | return NULL; | |
9444b1f2 LP |
1557 | |
1558 | p += strspn(p, "/"); | |
1559 | ||
1560 | n = strcspn(p, "/"); | |
fbd0b64f | 1561 | if (n < STRLEN("session-x.scope")) |
d4fffc4b ZJS |
1562 | return NULL; |
1563 | ||
8b0849e9 LP |
1564 | if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { |
1565 | char buf[n - 8 - 6 + 1]; | |
1566 | ||
1567 | memcpy(buf, p + 8, n - 8 - 6); | |
1568 | buf[n - 8 - 6] = 0; | |
d4fffc4b | 1569 | |
8b0849e9 LP |
1570 | /* Note that session scopes never need unescaping, |
1571 | * since they cannot conflict with the kernel's own | |
1572 | * names, hence we don't need to call cg_unescape() | |
1573 | * here. */ | |
1574 | ||
1575 | if (!session_id_valid(buf)) | |
1576 | return false; | |
1577 | ||
1578 | p += n; | |
1579 | p += strspn(p, "/"); | |
1580 | return p; | |
1581 | } | |
1582 | ||
1583 | return NULL; | |
d4fffc4b ZJS |
1584 | } |
1585 | ||
1586 | /** | |
1587 | * Skip user@*.service, but require it to be there. | |
1588 | */ | |
1589 | static const char *skip_user_manager(const char *p) { | |
1590 | size_t n; | |
1591 | ||
8b0849e9 LP |
1592 | if (isempty(p)) |
1593 | return NULL; | |
d4fffc4b ZJS |
1594 | |
1595 | p += strspn(p, "/"); | |
1596 | ||
1597 | n = strcspn(p, "/"); | |
fbd0b64f | 1598 | if (n < STRLEN("user@x.service")) |
6c03089c | 1599 | return NULL; |
ef1673d1 | 1600 | |
8b0849e9 LP |
1601 | if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { |
1602 | char buf[n - 5 - 8 + 1]; | |
9444b1f2 | 1603 | |
8b0849e9 LP |
1604 | memcpy(buf, p + 5, n - 5 - 8); |
1605 | buf[n - 5 - 8] = 0; | |
1606 | ||
1607 | /* Note that user manager services never need unescaping, | |
1608 | * since they cannot conflict with the kernel's own | |
1609 | * names, hence we don't need to call cg_unescape() | |
1610 | * here. */ | |
1611 | ||
1612 | if (parse_uid(buf, NULL) < 0) | |
1613 | return NULL; | |
1614 | ||
1615 | p += n; | |
1616 | p += strspn(p, "/"); | |
1617 | ||
1618 | return p; | |
1619 | } | |
1620 | ||
1621 | return NULL; | |
9444b1f2 LP |
1622 | } |
1623 | ||
329ac4bc | 1624 | static const char *skip_user_prefix(const char *path) { |
d4fffc4b | 1625 | const char *e, *t; |
ef1673d1 | 1626 | |
6c03089c | 1627 | assert(path); |
ba1261bc | 1628 | |
9444b1f2 LP |
1629 | /* Skip slices, if there are any */ |
1630 | e = skip_slices(path); | |
ba1261bc | 1631 | |
329ac4bc | 1632 | /* Skip the user manager, if it's in the path now... */ |
8b0849e9 | 1633 | t = skip_user_manager(e); |
329ac4bc LP |
1634 | if (t) |
1635 | return t; | |
8b0849e9 | 1636 | |
329ac4bc LP |
1637 | /* Alternatively skip the user session if it is in the path... */ |
1638 | return skip_session(e); | |
1639 | } | |
32081481 | 1640 | |
329ac4bc LP |
1641 | int cg_path_get_user_unit(const char *path, char **ret) { |
1642 | const char *t; | |
6c03089c | 1643 | |
329ac4bc LP |
1644 | assert(path); |
1645 | assert(ret); | |
8b0849e9 | 1646 | |
329ac4bc LP |
1647 | t = skip_user_prefix(path); |
1648 | if (!t) | |
8b0849e9 | 1649 | return -ENXIO; |
8b0849e9 | 1650 | |
329ac4bc LP |
1651 | /* And from here on it looks pretty much the same as for a |
1652 | * system unit, hence let's use the same parser from here | |
1653 | * on. */ | |
1654 | return cg_path_get_unit(t, ret); | |
ef1673d1 | 1655 | } |
ba1261bc | 1656 | |
ef1673d1 | 1657 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
7fd1b19b | 1658 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1659 | int r; |
1660 | ||
1661 | assert(unit); | |
1662 | ||
7027ff61 | 1663 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1664 | if (r < 0) |
1665 | return r; | |
1666 | ||
1667 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1668 | } |
e884315e | 1669 | |
7027ff61 | 1670 | int cg_path_get_machine_name(const char *path, char **machine) { |
efdb0237 LP |
1671 | _cleanup_free_ char *u = NULL; |
1672 | const char *sl; | |
89f7c846 | 1673 | int r; |
374ec6ab | 1674 | |
89f7c846 LP |
1675 | r = cg_path_get_unit(path, &u); |
1676 | if (r < 0) | |
1677 | return r; | |
7027ff61 | 1678 | |
efdb0237 | 1679 | sl = strjoina("/run/systemd/machines/unit:", u); |
89f7c846 | 1680 | return readlink_malloc(sl, machine); |
7027ff61 LP |
1681 | } |
1682 | ||
1683 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
7fd1b19b | 1684 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1685 | int r; |
1686 | ||
1687 | assert(machine); | |
1688 | ||
1689 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1690 | if (r < 0) | |
1691 | return r; | |
1692 | ||
1693 | return cg_path_get_machine_name(cgroup, machine); | |
1694 | } | |
1695 | ||
1696 | int cg_path_get_session(const char *path, char **session) { | |
8b0849e9 LP |
1697 | _cleanup_free_ char *unit = NULL; |
1698 | char *start, *end; | |
1699 | int r; | |
7027ff61 LP |
1700 | |
1701 | assert(path); | |
7027ff61 | 1702 | |
8b0849e9 LP |
1703 | r = cg_path_get_unit(path, &unit); |
1704 | if (r < 0) | |
1705 | return r; | |
7027ff61 | 1706 | |
8b0849e9 LP |
1707 | start = startswith(unit, "session-"); |
1708 | if (!start) | |
cfeaa44a | 1709 | return -ENXIO; |
8b0849e9 LP |
1710 | end = endswith(start, ".scope"); |
1711 | if (!end) | |
cfeaa44a | 1712 | return -ENXIO; |
8b0849e9 LP |
1713 | |
1714 | *end = 0; | |
1715 | if (!session_id_valid(start)) | |
cfeaa44a | 1716 | return -ENXIO; |
374ec6ab | 1717 | |
af08d2f9 | 1718 | if (session) { |
8b0849e9 | 1719 | char *rr; |
af08d2f9 | 1720 | |
8b0849e9 LP |
1721 | rr = strdup(start); |
1722 | if (!rr) | |
af08d2f9 LP |
1723 | return -ENOMEM; |
1724 | ||
8b0849e9 | 1725 | *session = rr; |
af08d2f9 | 1726 | } |
7027ff61 | 1727 | |
7027ff61 LP |
1728 | return 0; |
1729 | } | |
1730 | ||
1731 | int cg_pid_get_session(pid_t pid, char **session) { | |
7fd1b19b | 1732 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1733 | int r; |
1734 | ||
7027ff61 LP |
1735 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1736 | if (r < 0) | |
1737 | return r; | |
1738 | ||
1739 | return cg_path_get_session(cgroup, session); | |
1740 | } | |
1741 | ||
ae018d9b | 1742 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
374ec6ab | 1743 | _cleanup_free_ char *slice = NULL; |
8b0849e9 | 1744 | char *start, *end; |
374ec6ab | 1745 | int r; |
ae018d9b LP |
1746 | |
1747 | assert(path); | |
ae018d9b | 1748 | |
374ec6ab LP |
1749 | r = cg_path_get_slice(path, &slice); |
1750 | if (r < 0) | |
1751 | return r; | |
ae018d9b | 1752 | |
674eb685 LP |
1753 | start = startswith(slice, "user-"); |
1754 | if (!start) | |
cfeaa44a | 1755 | return -ENXIO; |
8b0849e9 | 1756 | end = endswith(start, ".slice"); |
674eb685 | 1757 | if (!end) |
cfeaa44a | 1758 | return -ENXIO; |
ae018d9b | 1759 | |
8b0849e9 LP |
1760 | *end = 0; |
1761 | if (parse_uid(start, uid) < 0) | |
cfeaa44a | 1762 | return -ENXIO; |
674eb685 | 1763 | |
674eb685 | 1764 | return 0; |
ae018d9b LP |
1765 | } |
1766 | ||
1767 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1768 | _cleanup_free_ char *cgroup = NULL; | |
1769 | int r; | |
1770 | ||
ae018d9b LP |
1771 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1772 | if (r < 0) | |
1773 | return r; | |
1774 | ||
1775 | return cg_path_get_owner_uid(cgroup, uid); | |
1776 | } | |
1777 | ||
1021b21b LP |
1778 | int cg_path_get_slice(const char *p, char **slice) { |
1779 | const char *e = NULL; | |
1021b21b LP |
1780 | |
1781 | assert(p); | |
1782 | assert(slice); | |
1783 | ||
329ac4bc LP |
1784 | /* Finds the right-most slice unit from the beginning, but |
1785 | * stops before we come to the first non-slice unit. */ | |
1786 | ||
1021b21b LP |
1787 | for (;;) { |
1788 | size_t n; | |
1789 | ||
1790 | p += strspn(p, "/"); | |
1791 | ||
1792 | n = strcspn(p, "/"); | |
8b0849e9 | 1793 | if (!valid_slice_name(p, n)) { |
1021b21b | 1794 | |
8b0849e9 LP |
1795 | if (!e) { |
1796 | char *s; | |
1021b21b | 1797 | |
e5d855d3 | 1798 | s = strdup(SPECIAL_ROOT_SLICE); |
8b0849e9 LP |
1799 | if (!s) |
1800 | return -ENOMEM; | |
1021b21b | 1801 | |
8b0849e9 LP |
1802 | *slice = s; |
1803 | return 0; | |
1804 | } | |
1805 | ||
1806 | return cg_path_decode_unit(e, slice); | |
1021b21b LP |
1807 | } |
1808 | ||
1809 | e = p; | |
1021b21b LP |
1810 | p += n; |
1811 | } | |
1812 | } | |
1813 | ||
1814 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1815 | _cleanup_free_ char *cgroup = NULL; | |
1816 | int r; | |
1817 | ||
1818 | assert(slice); | |
1819 | ||
1820 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1821 | if (r < 0) | |
1822 | return r; | |
1823 | ||
1824 | return cg_path_get_slice(cgroup, slice); | |
1825 | } | |
1826 | ||
329ac4bc LP |
1827 | int cg_path_get_user_slice(const char *p, char **slice) { |
1828 | const char *t; | |
1829 | assert(p); | |
1830 | assert(slice); | |
1831 | ||
1832 | t = skip_user_prefix(p); | |
1833 | if (!t) | |
1834 | return -ENXIO; | |
1835 | ||
1836 | /* And now it looks pretty much the same as for a system | |
1837 | * slice, so let's just use the same parser from here on. */ | |
1838 | return cg_path_get_slice(t, slice); | |
1839 | } | |
1840 | ||
1841 | int cg_pid_get_user_slice(pid_t pid, char **slice) { | |
1842 | _cleanup_free_ char *cgroup = NULL; | |
1843 | int r; | |
1844 | ||
1845 | assert(slice); | |
1846 | ||
1847 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1848 | if (r < 0) | |
1849 | return r; | |
1850 | ||
1851 | return cg_path_get_user_slice(cgroup, slice); | |
1852 | } | |
1853 | ||
ae018d9b LP |
1854 | char *cg_escape(const char *p) { |
1855 | bool need_prefix = false; | |
1856 | ||
1857 | /* This implements very minimal escaping for names to be used | |
1858 | * as file names in the cgroup tree: any name which might | |
1859 | * conflict with a kernel name or is prefixed with '_' is | |
1860 | * prefixed with a '_'. That way, when reading cgroup names it | |
1861 | * is sufficient to remove a single prefixing underscore if | |
1862 | * there is one. */ | |
1863 | ||
1864 | /* The return value of this function (unlike cg_unescape()) | |
1865 | * needs free()! */ | |
1866 | ||
4c701096 | 1867 | if (IN_SET(p[0], 0, '_', '.') || |
a0ab5665 LP |
1868 | streq(p, "notify_on_release") || |
1869 | streq(p, "release_agent") || | |
efdb0237 LP |
1870 | streq(p, "tasks") || |
1871 | startswith(p, "cgroup.")) | |
ae018d9b LP |
1872 | need_prefix = true; |
1873 | else { | |
1874 | const char *dot; | |
1875 | ||
1876 | dot = strrchr(p, '.'); | |
1877 | if (dot) { | |
efdb0237 LP |
1878 | CGroupController c; |
1879 | size_t l = dot - p; | |
ae018d9b | 1880 | |
efdb0237 LP |
1881 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
1882 | const char *n; | |
1883 | ||
1884 | n = cgroup_controller_to_string(c); | |
ae018d9b | 1885 | |
efdb0237 LP |
1886 | if (l != strlen(n)) |
1887 | continue; | |
ae018d9b | 1888 | |
efdb0237 LP |
1889 | if (memcmp(p, n, l) != 0) |
1890 | continue; | |
1891 | ||
1892 | need_prefix = true; | |
1893 | break; | |
ae018d9b LP |
1894 | } |
1895 | } | |
1896 | } | |
1897 | ||
1898 | if (need_prefix) | |
1899 | return strappend("_", p); | |
efdb0237 LP |
1900 | |
1901 | return strdup(p); | |
ae018d9b LP |
1902 | } |
1903 | ||
1904 | char *cg_unescape(const char *p) { | |
1905 | assert(p); | |
1906 | ||
1907 | /* The return value of this function (unlike cg_escape()) | |
1908 | * doesn't need free()! */ | |
1909 | ||
1910 | if (p[0] == '_') | |
1911 | return (char*) p+1; | |
1912 | ||
1913 | return (char*) p; | |
1914 | } | |
78edb35a LP |
1915 | |
1916 | #define CONTROLLER_VALID \ | |
4b549144 | 1917 | DIGITS LETTERS \ |
78edb35a LP |
1918 | "_" |
1919 | ||
185a0874 | 1920 | bool cg_controller_is_valid(const char *p) { |
78edb35a LP |
1921 | const char *t, *s; |
1922 | ||
1923 | if (!p) | |
1924 | return false; | |
1925 | ||
b6629c4b TH |
1926 | if (streq(p, SYSTEMD_CGROUP_CONTROLLER)) |
1927 | return true; | |
1928 | ||
185a0874 DJL |
1929 | s = startswith(p, "name="); |
1930 | if (s) | |
1931 | p = s; | |
78edb35a | 1932 | |
4c701096 | 1933 | if (IN_SET(*p, 0, '_')) |
78edb35a LP |
1934 | return false; |
1935 | ||
1936 | for (t = p; *t; t++) | |
1937 | if (!strchr(CONTROLLER_VALID, *t)) | |
1938 | return false; | |
1939 | ||
1940 | if (t - p > FILENAME_MAX) | |
1941 | return false; | |
1942 | ||
1943 | return true; | |
1944 | } | |
a016b922 LP |
1945 | |
1946 | int cg_slice_to_path(const char *unit, char **ret) { | |
1947 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1948 | const char *dash; | |
7410616c | 1949 | int r; |
a016b922 LP |
1950 | |
1951 | assert(unit); | |
1952 | assert(ret); | |
1953 | ||
e5d855d3 | 1954 | if (streq(unit, SPECIAL_ROOT_SLICE)) { |
c96cc582 LP |
1955 | char *x; |
1956 | ||
1957 | x = strdup(""); | |
1958 | if (!x) | |
1959 | return -ENOMEM; | |
1960 | *ret = x; | |
1961 | return 0; | |
1962 | } | |
1963 | ||
7410616c | 1964 | if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) |
a016b922 LP |
1965 | return -EINVAL; |
1966 | ||
1967 | if (!endswith(unit, ".slice")) | |
1968 | return -EINVAL; | |
1969 | ||
7410616c LP |
1970 | r = unit_name_to_prefix(unit, &p); |
1971 | if (r < 0) | |
1972 | return r; | |
a016b922 LP |
1973 | |
1974 | dash = strchr(p, '-'); | |
e66e5b61 LP |
1975 | |
1976 | /* Don't allow initial dashes */ | |
1977 | if (dash == p) | |
1978 | return -EINVAL; | |
1979 | ||
a016b922 LP |
1980 | while (dash) { |
1981 | _cleanup_free_ char *escaped = NULL; | |
1982 | char n[dash - p + sizeof(".slice")]; | |
1983 | ||
e66e5b61 | 1984 | /* Don't allow trailing or double dashes */ |
4c701096 | 1985 | if (IN_SET(dash[1], 0, '-')) |
c96cc582 | 1986 | return -EINVAL; |
a016b922 | 1987 | |
c96cc582 | 1988 | strcpy(stpncpy(n, p, dash - p), ".slice"); |
7410616c | 1989 | if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) |
a016b922 LP |
1990 | return -EINVAL; |
1991 | ||
1992 | escaped = cg_escape(n); | |
1993 | if (!escaped) | |
1994 | return -ENOMEM; | |
1995 | ||
1996 | if (!strextend(&s, escaped, "/", NULL)) | |
1997 | return -ENOMEM; | |
1998 | ||
1999 | dash = strchr(dash+1, '-'); | |
2000 | } | |
2001 | ||
2002 | e = cg_escape(unit); | |
2003 | if (!e) | |
2004 | return -ENOMEM; | |
2005 | ||
2006 | if (!strextend(&s, e, NULL)) | |
2007 | return -ENOMEM; | |
2008 | ||
2009 | *ret = s; | |
2010 | s = NULL; | |
2011 | ||
2012 | return 0; | |
2013 | } | |
4ad49000 LP |
2014 | |
2015 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
2016 | _cleanup_free_ char *p = NULL; | |
2017 | int r; | |
2018 | ||
2019 | r = cg_get_path(controller, path, attribute, &p); | |
2020 | if (r < 0) | |
2021 | return r; | |
2022 | ||
4c1fc3e4 | 2023 | return write_string_file(p, value, 0); |
4ad49000 LP |
2024 | } |
2025 | ||
934277fe LP |
2026 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
2027 | _cleanup_free_ char *p = NULL; | |
2028 | int r; | |
2029 | ||
2030 | r = cg_get_path(controller, path, attribute, &p); | |
2031 | if (r < 0) | |
2032 | return r; | |
2033 | ||
2034 | return read_one_line_file(p, ret); | |
2035 | } | |
2036 | ||
66ebf6c0 TH |
2037 | int cg_get_keyed_attribute(const char *controller, const char *path, const char *attribute, const char **keys, char **values) { |
2038 | _cleanup_free_ char *filename = NULL, *content = NULL; | |
2039 | char *line, *p; | |
2040 | int i, r; | |
2041 | ||
2042 | for (i = 0; keys[i]; i++) | |
2043 | values[i] = NULL; | |
2044 | ||
2045 | r = cg_get_path(controller, path, attribute, &filename); | |
2046 | if (r < 0) | |
2047 | return r; | |
2048 | ||
2049 | r = read_full_file(filename, &content, NULL); | |
2050 | if (r < 0) | |
2051 | return r; | |
2052 | ||
2053 | p = content; | |
2054 | while ((line = strsep(&p, "\n"))) { | |
2055 | char *key; | |
2056 | ||
2057 | key = strsep(&line, " "); | |
2058 | ||
2059 | for (i = 0; keys[i]; i++) { | |
2060 | if (streq(key, keys[i])) { | |
2061 | values[i] = strdup(line); | |
2062 | break; | |
2063 | } | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | for (i = 0; keys[i]; i++) { | |
2068 | if (!values[i]) { | |
2069 | for (i = 0; keys[i]; i++) { | |
95333b2b | 2070 | values[i] = mfree(values[i]); |
66ebf6c0 TH |
2071 | } |
2072 | return -ENOENT; | |
2073 | } | |
2074 | } | |
2075 | ||
2076 | return 0; | |
2077 | } | |
2078 | ||
efdb0237 LP |
2079 | int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) { |
2080 | CGroupController c; | |
415fc41c | 2081 | int r; |
4ad49000 LP |
2082 | |
2083 | /* This one will create a cgroup in our private tree, but also | |
2084 | * duplicate it in the trees specified in mask, and remove it | |
2085 | * in all others */ | |
2086 | ||
2087 | /* First create the cgroup in our own hierarchy. */ | |
2088 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
2089 | if (r < 0) | |
2090 | return r; | |
2091 | ||
efdb0237 | 2092 | /* If we are in the unified hierarchy, we are done now */ |
b4cccbc1 LP |
2093 | r = cg_all_unified(); |
2094 | if (r < 0) | |
2095 | return r; | |
2096 | if (r > 0) | |
efdb0237 LP |
2097 | return 0; |
2098 | ||
2099 | /* Otherwise, do the same in the other hierarchies */ | |
2100 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2101 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2102 | const char *n; | |
2103 | ||
2104 | n = cgroup_controller_to_string(c); | |
2105 | ||
13b84ec7 | 2106 | if (mask & bit) |
efdb0237 | 2107 | (void) cg_create(n, path); |
13b84ec7 | 2108 | else if (supported & bit) |
efdb0237 | 2109 | (void) cg_trim(n, path, true); |
4ad49000 LP |
2110 | } |
2111 | ||
13b84ec7 | 2112 | return 0; |
4ad49000 LP |
2113 | } |
2114 | ||
efdb0237 LP |
2115 | int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { |
2116 | CGroupController c; | |
415fc41c | 2117 | int r; |
4ad49000 LP |
2118 | |
2119 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
13b84ec7 LP |
2120 | if (r < 0) |
2121 | return r; | |
4ad49000 | 2122 | |
b4cccbc1 LP |
2123 | r = cg_all_unified(); |
2124 | if (r < 0) | |
2125 | return r; | |
2126 | if (r > 0) | |
efdb0237 | 2127 | return 0; |
7b3fd631 | 2128 | |
efdb0237 LP |
2129 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
2130 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2131 | const char *p = NULL; | |
7b3fd631 | 2132 | |
efdb0237 LP |
2133 | if (!(supported & bit)) |
2134 | continue; | |
7b3fd631 | 2135 | |
efdb0237 LP |
2136 | if (path_callback) |
2137 | p = path_callback(bit, userdata); | |
7b3fd631 | 2138 | |
efdb0237 LP |
2139 | if (!p) |
2140 | p = path; | |
4ad49000 | 2141 | |
efdb0237 | 2142 | (void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid); |
4ad49000 LP |
2143 | } |
2144 | ||
13b84ec7 | 2145 | return 0; |
4ad49000 LP |
2146 | } |
2147 | ||
efdb0237 | 2148 | int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { |
6c12b52e LP |
2149 | Iterator i; |
2150 | void *pidp; | |
2151 | int r = 0; | |
2152 | ||
2153 | SET_FOREACH(pidp, pids, i) { | |
fea72cc0 | 2154 | pid_t pid = PTR_TO_PID(pidp); |
13b84ec7 | 2155 | int q; |
6c12b52e | 2156 | |
7b3fd631 | 2157 | q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); |
efdb0237 | 2158 | if (q < 0 && r >= 0) |
13b84ec7 | 2159 | r = q; |
6c12b52e LP |
2160 | } |
2161 | ||
2162 | return r; | |
2163 | } | |
2164 | ||
efdb0237 | 2165 | int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
b3c5bad3 | 2166 | CGroupController c; |
b4cccbc1 | 2167 | int r = 0, q; |
4ad49000 | 2168 | |
13b84ec7 | 2169 | if (!path_equal(from, to)) { |
1d98fef1 | 2170 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE); |
13b84ec7 LP |
2171 | if (r < 0) |
2172 | return r; | |
2173 | } | |
4ad49000 | 2174 | |
b4cccbc1 LP |
2175 | q = cg_all_unified(); |
2176 | if (q < 0) | |
2177 | return q; | |
2178 | if (q > 0) | |
efdb0237 | 2179 | return r; |
03b90d4b | 2180 | |
efdb0237 LP |
2181 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
2182 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2183 | const char *p = NULL; | |
03b90d4b | 2184 | |
efdb0237 LP |
2185 | if (!(supported & bit)) |
2186 | continue; | |
03b90d4b | 2187 | |
efdb0237 LP |
2188 | if (to_callback) |
2189 | p = to_callback(bit, userdata); | |
4ad49000 | 2190 | |
efdb0237 LP |
2191 | if (!p) |
2192 | p = to; | |
2193 | ||
1d98fef1 | 2194 | (void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, 0); |
4ad49000 LP |
2195 | } |
2196 | ||
13b84ec7 | 2197 | return 0; |
4ad49000 LP |
2198 | } |
2199 | ||
efdb0237 LP |
2200 | int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) { |
2201 | CGroupController c; | |
b4cccbc1 | 2202 | int r, q; |
4ad49000 LP |
2203 | |
2204 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
2205 | if (r < 0) | |
2206 | return r; | |
2207 | ||
b4cccbc1 LP |
2208 | q = cg_all_unified(); |
2209 | if (q < 0) | |
2210 | return q; | |
2211 | if (q > 0) | |
efdb0237 LP |
2212 | return r; |
2213 | ||
2214 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2215 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2216 | ||
2217 | if (!(supported & bit)) | |
2218 | continue; | |
4ad49000 | 2219 | |
efdb0237 | 2220 | (void) cg_trim(cgroup_controller_to_string(c), path, delete_root); |
4ad49000 LP |
2221 | } |
2222 | ||
13b84ec7 | 2223 | return 0; |
4ad49000 LP |
2224 | } |
2225 | ||
aae7e17f | 2226 | int cg_mask_to_string(CGroupMask mask, char **ret) { |
ec635a2d LP |
2227 | _cleanup_free_ char *s = NULL; |
2228 | size_t n = 0, allocated = 0; | |
2229 | bool space = false; | |
aae7e17f | 2230 | CGroupController c; |
aae7e17f FB |
2231 | |
2232 | assert(ret); | |
2233 | ||
2234 | if (mask == 0) { | |
2235 | *ret = NULL; | |
2236 | return 0; | |
2237 | } | |
2238 | ||
2239 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
ec635a2d LP |
2240 | const char *k; |
2241 | size_t l; | |
aae7e17f FB |
2242 | |
2243 | if (!(mask & CGROUP_CONTROLLER_TO_MASK(c))) | |
2244 | continue; | |
2245 | ||
ec635a2d LP |
2246 | k = cgroup_controller_to_string(c); |
2247 | l = strlen(k); | |
2248 | ||
2249 | if (!GREEDY_REALLOC(s, allocated, n + space + l + 1)) | |
2250 | return -ENOMEM; | |
2251 | ||
2252 | if (space) | |
2253 | s[n] = ' '; | |
2254 | memcpy(s + n + space, k, l); | |
2255 | n += space + l; | |
2256 | ||
2257 | space = true; | |
aae7e17f FB |
2258 | } |
2259 | ||
ec635a2d | 2260 | assert(s); |
aae7e17f | 2261 | |
ec635a2d | 2262 | s[n] = 0; |
aae7e17f | 2263 | *ret = s; |
ec635a2d LP |
2264 | s = NULL; |
2265 | ||
aae7e17f FB |
2266 | return 0; |
2267 | } | |
2268 | ||
2269 | int cg_mask_from_string(const char *value, CGroupMask *mask) { | |
2270 | assert(mask); | |
2271 | assert(value); | |
2272 | ||
2273 | for (;;) { | |
2274 | _cleanup_free_ char *n = NULL; | |
2275 | CGroupController v; | |
2276 | int r; | |
2277 | ||
2278 | r = extract_first_word(&value, &n, NULL, 0); | |
2279 | if (r < 0) | |
2280 | return r; | |
2281 | if (r == 0) | |
2282 | break; | |
2283 | ||
2284 | v = cgroup_controller_from_string(n); | |
2285 | if (v < 0) | |
2286 | continue; | |
2287 | ||
2288 | *mask |= CGROUP_CONTROLLER_TO_MASK(v); | |
2289 | } | |
2290 | return 0; | |
2291 | } | |
2292 | ||
efdb0237 LP |
2293 | int cg_mask_supported(CGroupMask *ret) { |
2294 | CGroupMask mask = 0; | |
415fc41c | 2295 | int r; |
efdb0237 LP |
2296 | |
2297 | /* Determines the mask of supported cgroup controllers. Only | |
2298 | * includes controllers we can make sense of and that are | |
2299 | * actually accessible. */ | |
4ad49000 | 2300 | |
b4cccbc1 LP |
2301 | r = cg_all_unified(); |
2302 | if (r < 0) | |
2303 | return r; | |
2304 | if (r > 0) { | |
5f4c5fef | 2305 | _cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL; |
efdb0237 LP |
2306 | |
2307 | /* In the unified hierarchy we can read the supported | |
2308 | * and accessible controllers from a the top-level | |
2309 | * cgroup attribute */ | |
2310 | ||
5f4c5fef LP |
2311 | r = cg_get_root_path(&root); |
2312 | if (r < 0) | |
2313 | return r; | |
2314 | ||
2315 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path); | |
2316 | if (r < 0) | |
2317 | return r; | |
2318 | ||
2319 | r = read_one_line_file(path, &controllers); | |
efdb0237 LP |
2320 | if (r < 0) |
2321 | return r; | |
4ad49000 | 2322 | |
aae7e17f FB |
2323 | r = cg_mask_from_string(controllers, &mask); |
2324 | if (r < 0) | |
2325 | return r; | |
efdb0237 | 2326 | |
66ebf6c0 | 2327 | /* Currently, we support the cpu, memory, io and pids |
03a7b521 LP |
2328 | * controller in the unified hierarchy, mask |
2329 | * everything else off. */ | |
66ebf6c0 | 2330 | mask &= CGROUP_MASK_CPU | CGROUP_MASK_MEMORY | CGROUP_MASK_IO | CGROUP_MASK_PIDS; |
efdb0237 LP |
2331 | |
2332 | } else { | |
2333 | CGroupController c; | |
2334 | ||
2335 | /* In the legacy hierarchy, we check whether which | |
2336 | * hierarchies are mounted. */ | |
2337 | ||
2338 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2339 | const char *n; | |
2340 | ||
2341 | n = cgroup_controller_to_string(c); | |
2342 | if (controller_is_accessible(n) >= 0) | |
2343 | mask |= CGROUP_CONTROLLER_TO_MASK(c); | |
2344 | } | |
4ad49000 LP |
2345 | } |
2346 | ||
efdb0237 LP |
2347 | *ret = mask; |
2348 | return 0; | |
4ad49000 | 2349 | } |
b12afc8c | 2350 | |
6925a0de LP |
2351 | int cg_kernel_controllers(Set **ret) { |
2352 | _cleanup_set_free_free_ Set *controllers = NULL; | |
b12afc8c | 2353 | _cleanup_fclose_ FILE *f = NULL; |
b12afc8c LP |
2354 | int r; |
2355 | ||
6925a0de | 2356 | assert(ret); |
b12afc8c | 2357 | |
e155a0aa LP |
2358 | /* Determines the full list of kernel-known controllers. Might |
2359 | * include controllers we don't actually support, arbitrary | |
2360 | * named hierarchies and controllers that aren't currently | |
2361 | * accessible (because not mounted). */ | |
2362 | ||
6925a0de LP |
2363 | controllers = set_new(&string_hash_ops); |
2364 | if (!controllers) | |
2365 | return -ENOMEM; | |
2366 | ||
b12afc8c LP |
2367 | f = fopen("/proc/cgroups", "re"); |
2368 | if (!f) { | |
6925a0de LP |
2369 | if (errno == ENOENT) { |
2370 | *ret = NULL; | |
b12afc8c | 2371 | return 0; |
6925a0de LP |
2372 | } |
2373 | ||
b12afc8c LP |
2374 | return -errno; |
2375 | } | |
2376 | ||
35bbbf85 LP |
2377 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
2378 | ||
b12afc8c | 2379 | /* Ignore the header line */ |
2351e44d | 2380 | (void) read_line(f, (size_t) -1, NULL); |
b12afc8c LP |
2381 | |
2382 | for (;;) { | |
2383 | char *controller; | |
2384 | int enabled = 0; | |
2385 | ||
2386 | errno = 0; | |
2387 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { | |
2388 | ||
2389 | if (feof(f)) | |
2390 | break; | |
2391 | ||
b3267152 | 2392 | if (ferror(f) && errno > 0) |
b12afc8c LP |
2393 | return -errno; |
2394 | ||
2395 | return -EBADMSG; | |
2396 | } | |
2397 | ||
2398 | if (!enabled) { | |
2399 | free(controller); | |
2400 | continue; | |
2401 | } | |
2402 | ||
efdb0237 | 2403 | if (!cg_controller_is_valid(controller)) { |
b12afc8c LP |
2404 | free(controller); |
2405 | return -EBADMSG; | |
2406 | } | |
2407 | ||
2408 | r = set_consume(controllers, controller); | |
2409 | if (r < 0) | |
2410 | return r; | |
2411 | } | |
2412 | ||
6925a0de LP |
2413 | *ret = controllers; |
2414 | controllers = NULL; | |
2415 | ||
b12afc8c LP |
2416 | return 0; |
2417 | } | |
efdb0237 | 2418 | |
5da38d07 TH |
2419 | static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN; |
2420 | ||
c22800e4 LP |
2421 | /* The hybrid mode was initially implemented in v232 and simply mounted cgroup v2 on /sys/fs/cgroup/systemd. This |
2422 | * unfortunately broke other tools (such as docker) which expected the v1 "name=systemd" hierarchy on | |
2423 | * /sys/fs/cgroup/systemd. From v233 and on, the hybrid mode mountnbs v2 on /sys/fs/cgroup/unified and maintains | |
2424 | * "name=systemd" hierarchy on /sys/fs/cgroup/systemd for compatibility with other tools. | |
f08e9287 | 2425 | * |
c22800e4 LP |
2426 | * To keep live upgrade working, we detect and support v232 layout. When v232 layout is detected, to keep cgroup v2 |
2427 | * process management but disable the compat dual layout, we return %true on | |
2428 | * cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) and %false on cg_hybrid_unified(). | |
f08e9287 TH |
2429 | */ |
2430 | static thread_local bool unified_systemd_v232; | |
2431 | ||
1fcca10e | 2432 | static int cg_unified_update(void) { |
efdb0237 | 2433 | |
efdb0237 LP |
2434 | struct statfs fs; |
2435 | ||
2436 | /* Checks if we support the unified hierarchy. Returns an | |
2437 | * error when the cgroup hierarchies aren't mounted yet or we | |
2438 | * have any other trouble determining if the unified hierarchy | |
2439 | * is supported. */ | |
2440 | ||
5da38d07 TH |
2441 | if (unified_cache >= CGROUP_UNIFIED_NONE) |
2442 | return 0; | |
efdb0237 LP |
2443 | |
2444 | if (statfs("/sys/fs/cgroup/", &fs) < 0) | |
9aa21133 | 2445 | return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/\" failed: %m"); |
efdb0237 | 2446 | |
9aa21133 ZJS |
2447 | if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { |
2448 | log_debug("Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy"); | |
5da38d07 | 2449 | unified_cache = CGROUP_UNIFIED_ALL; |
9aa21133 | 2450 | } else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) { |
2977724b | 2451 | if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 && |
f08e9287 | 2452 | F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { |
9aa21133 | 2453 | log_debug("Found cgroup2 on /sys/fs/cgroup/unified, unified hierarchy for systemd controller"); |
2977724b | 2454 | unified_cache = CGROUP_UNIFIED_SYSTEMD; |
f08e9287 | 2455 | unified_systemd_v232 = false; |
f08e9287 | 2456 | } else { |
2977724b | 2457 | if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0) |
9aa21133 | 2458 | return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/systemd\" failed: %m"); |
5535d8f7 EV |
2459 | |
2460 | if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { | |
2461 | log_debug("Found cgroup2 on /sys/fs/cgroup/systemd, unified hierarchy for systemd controller (v232 variant)"); | |
2462 | unified_cache = CGROUP_UNIFIED_SYSTEMD; | |
2463 | unified_systemd_v232 = true; | |
2464 | } else if (F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC)) { | |
2465 | log_debug("Found cgroup on /sys/fs/cgroup/systemd, legacy hierarchy"); | |
2466 | unified_cache = CGROUP_UNIFIED_NONE; | |
2467 | } else { | |
2468 | log_debug("Unexpected filesystem type %llx mounted on /sys/fs/cgroup/systemd, assuming legacy hierarchy", | |
9aa21133 | 2469 | (unsigned long long) fs.f_type); |
5535d8f7 | 2470 | unified_cache = CGROUP_UNIFIED_NONE; |
9aa21133 | 2471 | } |
2977724b | 2472 | } |
651d47d1 ZJS |
2473 | } else { |
2474 | log_debug("Unknown filesystem type %llx mounted on /sys/fs/cgroup.", | |
2475 | (unsigned long long) fs.f_type); | |
8b3aa503 | 2476 | return -ENOMEDIUM; |
651d47d1 | 2477 | } |
efdb0237 | 2478 | |
5da38d07 TH |
2479 | return 0; |
2480 | } | |
2481 | ||
c22800e4 | 2482 | int cg_unified_controller(const char *controller) { |
b4cccbc1 | 2483 | int r; |
5da38d07 | 2484 | |
1fcca10e | 2485 | r = cg_unified_update(); |
b4cccbc1 LP |
2486 | if (r < 0) |
2487 | return r; | |
5da38d07 | 2488 | |
fc9ae717 LP |
2489 | if (unified_cache == CGROUP_UNIFIED_NONE) |
2490 | return false; | |
2491 | ||
2492 | if (unified_cache >= CGROUP_UNIFIED_ALL) | |
2493 | return true; | |
2494 | ||
2495 | return streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER); | |
5da38d07 TH |
2496 | } |
2497 | ||
b4cccbc1 | 2498 | int cg_all_unified(void) { |
4bb652ac LP |
2499 | int r; |
2500 | ||
2501 | r = cg_unified_update(); | |
2502 | if (r < 0) | |
2503 | return r; | |
2504 | ||
2505 | return unified_cache >= CGROUP_UNIFIED_ALL; | |
efdb0237 LP |
2506 | } |
2507 | ||
b4cccbc1 LP |
2508 | int cg_hybrid_unified(void) { |
2509 | int r; | |
2977724b | 2510 | |
1fcca10e | 2511 | r = cg_unified_update(); |
b4cccbc1 LP |
2512 | if (r < 0) |
2513 | return r; | |
2977724b | 2514 | |
f08e9287 | 2515 | return unified_cache == CGROUP_UNIFIED_SYSTEMD && !unified_systemd_v232; |
2977724b TH |
2516 | } |
2517 | ||
415fc41c | 2518 | int cg_unified_flush(void) { |
5da38d07 | 2519 | unified_cache = CGROUP_UNIFIED_UNKNOWN; |
415fc41c | 2520 | |
1fcca10e | 2521 | return cg_unified_update(); |
efdb0237 LP |
2522 | } |
2523 | ||
2524 | int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) { | |
77fa610b | 2525 | _cleanup_fclose_ FILE *f = NULL; |
efdb0237 LP |
2526 | _cleanup_free_ char *fs = NULL; |
2527 | CGroupController c; | |
415fc41c | 2528 | int r; |
efdb0237 LP |
2529 | |
2530 | assert(p); | |
2531 | ||
2532 | if (supported == 0) | |
2533 | return 0; | |
2534 | ||
b4cccbc1 LP |
2535 | r = cg_all_unified(); |
2536 | if (r < 0) | |
2537 | return r; | |
2538 | if (r == 0) /* on the legacy hiearchy there's no joining of controllers defined */ | |
efdb0237 LP |
2539 | return 0; |
2540 | ||
2541 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs); | |
2542 | if (r < 0) | |
2543 | return r; | |
2544 | ||
2545 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2546 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2547 | const char *n; | |
2548 | ||
2549 | if (!(supported & bit)) | |
2550 | continue; | |
2551 | ||
2552 | n = cgroup_controller_to_string(c); | |
2553 | { | |
2554 | char s[1 + strlen(n) + 1]; | |
2555 | ||
2556 | s[0] = mask & bit ? '+' : '-'; | |
2557 | strcpy(s + 1, n); | |
2558 | ||
77fa610b LP |
2559 | if (!f) { |
2560 | f = fopen(fs, "we"); | |
2561 | if (!f) { | |
2562 | log_debug_errno(errno, "Failed to open cgroup.subtree_control file of %s: %m", p); | |
2563 | break; | |
2564 | } | |
2565 | } | |
2566 | ||
2567 | r = write_string_stream(f, s, 0); | |
efdb0237 | 2568 | if (r < 0) |
98e4d8d7 | 2569 | log_debug_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs); |
efdb0237 LP |
2570 | } |
2571 | } | |
2572 | ||
2573 | return 0; | |
2574 | } | |
2575 | ||
2576 | bool cg_is_unified_wanted(void) { | |
2577 | static thread_local int wanted = -1; | |
415fc41c | 2578 | int r; |
1d84ad94 | 2579 | bool b; |
77fab2a9 | 2580 | const bool is_default = DEFAULT_HIERARCHY == CGROUP_UNIFIED_ALL; |
efdb0237 | 2581 | |
77fab2a9 | 2582 | /* If we have a cached value, return that. */ |
efdb0237 LP |
2583 | if (wanted >= 0) |
2584 | return wanted; | |
2585 | ||
239a3d09 ZJS |
2586 | /* If the hierarchy is already mounted, then follow whatever |
2587 | * was chosen for it. */ | |
2588 | if (cg_unified_flush() >= 0) | |
b4cccbc1 | 2589 | return (wanted = unified_cache >= CGROUP_UNIFIED_ALL); |
239a3d09 | 2590 | |
77fab2a9 ZJS |
2591 | /* Otherwise, let's see what the kernel command line has to say. |
2592 | * Since checking is expensive, cache a non-error result. */ | |
1d84ad94 | 2593 | r = proc_cmdline_get_bool("systemd.unified_cgroup_hierarchy", &b); |
efdb0237 | 2594 | |
77fab2a9 | 2595 | return (wanted = r > 0 ? b : is_default); |
efdb0237 LP |
2596 | } |
2597 | ||
2598 | bool cg_is_legacy_wanted(void) { | |
239a3d09 ZJS |
2599 | static thread_local int wanted = -1; |
2600 | ||
2601 | /* If we have a cached value, return that. */ | |
2602 | if (wanted >= 0) | |
2603 | return wanted; | |
2604 | ||
1b59cf04 ZJS |
2605 | /* Check if we have cgroups2 already mounted. */ |
2606 | if (cg_unified_flush() >= 0 && | |
2607 | unified_cache == CGROUP_UNIFIED_ALL) | |
239a3d09 | 2608 | return (wanted = false); |
1b59cf04 ZJS |
2609 | |
2610 | /* Otherwise, assume that at least partial legacy is wanted, | |
2611 | * since cgroups2 should already be mounted at this point. */ | |
239a3d09 | 2612 | return (wanted = true); |
efdb0237 LP |
2613 | } |
2614 | ||
a4464b95 | 2615 | bool cg_is_hybrid_wanted(void) { |
5da38d07 | 2616 | static thread_local int wanted = -1; |
415fc41c | 2617 | int r; |
1d84ad94 | 2618 | bool b; |
c19739db ZJS |
2619 | const bool is_default = DEFAULT_HIERARCHY >= CGROUP_UNIFIED_SYSTEMD; |
2620 | /* We default to true if the default is "hybrid", obviously, | |
2621 | * but also when the default is "unified", because if we get | |
2622 | * called, it means that unified hierarchy was not mounted. */ | |
5da38d07 | 2623 | |
77fab2a9 | 2624 | /* If we have a cached value, return that. */ |
5da38d07 TH |
2625 | if (wanted >= 0) |
2626 | return wanted; | |
2627 | ||
239a3d09 ZJS |
2628 | /* If the hierarchy is already mounted, then follow whatever |
2629 | * was chosen for it. */ | |
2630 | if (cg_unified_flush() >= 0 && | |
2631 | unified_cache == CGROUP_UNIFIED_ALL) | |
2632 | return (wanted = false); | |
2633 | ||
77fab2a9 ZJS |
2634 | /* Otherwise, let's see what the kernel command line has to say. |
2635 | * Since checking is expensive, cache a non-error result. */ | |
1d84ad94 | 2636 | r = proc_cmdline_get_bool("systemd.legacy_systemd_cgroup_controller", &b); |
5da38d07 | 2637 | |
2dcb526d ZJS |
2638 | /* The meaning of the kernel option is reversed wrt. to the return value |
2639 | * of this function, hence the negation. */ | |
77fab2a9 | 2640 | return (wanted = r > 0 ? !b : is_default); |
5da38d07 TH |
2641 | } |
2642 | ||
13c31542 TH |
2643 | int cg_weight_parse(const char *s, uint64_t *ret) { |
2644 | uint64_t u; | |
2645 | int r; | |
2646 | ||
2647 | if (isempty(s)) { | |
2648 | *ret = CGROUP_WEIGHT_INVALID; | |
2649 | return 0; | |
2650 | } | |
2651 | ||
2652 | r = safe_atou64(s, &u); | |
2653 | if (r < 0) | |
2654 | return r; | |
2655 | ||
2656 | if (u < CGROUP_WEIGHT_MIN || u > CGROUP_WEIGHT_MAX) | |
2657 | return -ERANGE; | |
2658 | ||
2659 | *ret = u; | |
2660 | return 0; | |
2661 | } | |
2662 | ||
9be57249 TH |
2663 | const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX] = { |
2664 | [CGROUP_IO_RBPS_MAX] = CGROUP_LIMIT_MAX, | |
2665 | [CGROUP_IO_WBPS_MAX] = CGROUP_LIMIT_MAX, | |
ac06a0cf TH |
2666 | [CGROUP_IO_RIOPS_MAX] = CGROUP_LIMIT_MAX, |
2667 | [CGROUP_IO_WIOPS_MAX] = CGROUP_LIMIT_MAX, | |
9be57249 TH |
2668 | }; |
2669 | ||
2670 | static const char* const cgroup_io_limit_type_table[_CGROUP_IO_LIMIT_TYPE_MAX] = { | |
2671 | [CGROUP_IO_RBPS_MAX] = "IOReadBandwidthMax", | |
2672 | [CGROUP_IO_WBPS_MAX] = "IOWriteBandwidthMax", | |
ac06a0cf TH |
2673 | [CGROUP_IO_RIOPS_MAX] = "IOReadIOPSMax", |
2674 | [CGROUP_IO_WIOPS_MAX] = "IOWriteIOPSMax", | |
9be57249 TH |
2675 | }; |
2676 | ||
2677 | DEFINE_STRING_TABLE_LOOKUP(cgroup_io_limit_type, CGroupIOLimitType); | |
2678 | ||
d53d9474 LP |
2679 | int cg_cpu_shares_parse(const char *s, uint64_t *ret) { |
2680 | uint64_t u; | |
2681 | int r; | |
2682 | ||
2683 | if (isempty(s)) { | |
2684 | *ret = CGROUP_CPU_SHARES_INVALID; | |
2685 | return 0; | |
2686 | } | |
2687 | ||
2688 | r = safe_atou64(s, &u); | |
2689 | if (r < 0) | |
2690 | return r; | |
2691 | ||
2692 | if (u < CGROUP_CPU_SHARES_MIN || u > CGROUP_CPU_SHARES_MAX) | |
2693 | return -ERANGE; | |
2694 | ||
2695 | *ret = u; | |
2696 | return 0; | |
2697 | } | |
2698 | ||
2699 | int cg_blkio_weight_parse(const char *s, uint64_t *ret) { | |
2700 | uint64_t u; | |
2701 | int r; | |
2702 | ||
2703 | if (isempty(s)) { | |
2704 | *ret = CGROUP_BLKIO_WEIGHT_INVALID; | |
2705 | return 0; | |
2706 | } | |
2707 | ||
2708 | r = safe_atou64(s, &u); | |
2709 | if (r < 0) | |
2710 | return r; | |
2711 | ||
2712 | if (u < CGROUP_BLKIO_WEIGHT_MIN || u > CGROUP_BLKIO_WEIGHT_MAX) | |
2713 | return -ERANGE; | |
2714 | ||
2715 | *ret = u; | |
2716 | return 0; | |
2717 | } | |
2718 | ||
f0bef277 EV |
2719 | bool is_cgroup_fs(const struct statfs *s) { |
2720 | return is_fs_type(s, CGROUP_SUPER_MAGIC) || | |
2721 | is_fs_type(s, CGROUP2_SUPER_MAGIC); | |
2722 | } | |
2723 | ||
2724 | bool fd_is_cgroup_fs(int fd) { | |
2725 | struct statfs s; | |
2726 | ||
2727 | if (fstatfs(fd, &s) < 0) | |
2728 | return -errno; | |
2729 | ||
2730 | return is_cgroup_fs(&s); | |
2731 | } | |
2732 | ||
efdb0237 LP |
2733 | static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = { |
2734 | [CGROUP_CONTROLLER_CPU] = "cpu", | |
2735 | [CGROUP_CONTROLLER_CPUACCT] = "cpuacct", | |
13c31542 | 2736 | [CGROUP_CONTROLLER_IO] = "io", |
efdb0237 LP |
2737 | [CGROUP_CONTROLLER_BLKIO] = "blkio", |
2738 | [CGROUP_CONTROLLER_MEMORY] = "memory", | |
3905f127 | 2739 | [CGROUP_CONTROLLER_DEVICES] = "devices", |
03a7b521 | 2740 | [CGROUP_CONTROLLER_PIDS] = "pids", |
efdb0237 LP |
2741 | }; |
2742 | ||
2743 | DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController); |