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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" |
aae7e17f | 58 | #include "strv.h" |
84ac7bea | 59 | #include "unit-name.h" |
b1d4f8e1 | 60 | #include "user-util.h" |
8c6db833 | 61 | |
c6c18be3 | 62 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
7027ff61 | 63 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 64 | FILE *f; |
7027ff61 | 65 | int r; |
c6c18be3 | 66 | |
c6c18be3 LP |
67 | assert(_f); |
68 | ||
c3175a7f LP |
69 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
70 | if (r < 0) | |
c6c18be3 LP |
71 | return r; |
72 | ||
73 | f = fopen(fs, "re"); | |
c6c18be3 LP |
74 | if (!f) |
75 | return -errno; | |
76 | ||
77 | *_f = f; | |
78 | return 0; | |
79 | } | |
80 | ||
c6c18be3 LP |
81 | int cg_read_pid(FILE *f, pid_t *_pid) { |
82 | unsigned long ul; | |
83 | ||
84 | /* Note that the cgroup.procs might contain duplicates! See | |
85 | * cgroups.txt for details. */ | |
86 | ||
7027ff61 LP |
87 | assert(f); |
88 | assert(_pid); | |
89 | ||
c6c18be3 LP |
90 | errno = 0; |
91 | if (fscanf(f, "%lu", &ul) != 1) { | |
92 | ||
93 | if (feof(f)) | |
94 | return 0; | |
95 | ||
f5e5c28f | 96 | return errno > 0 ? -errno : -EIO; |
c6c18be3 LP |
97 | } |
98 | ||
99 | if (ul <= 0) | |
100 | return -EIO; | |
101 | ||
102 | *_pid = (pid_t) ul; | |
103 | return 1; | |
104 | } | |
105 | ||
ab2c3861 TH |
106 | int cg_read_event(const char *controller, const char *path, const char *event, |
107 | char **val) | |
108 | { | |
109 | _cleanup_free_ char *events = NULL, *content = NULL; | |
110 | char *p, *line; | |
111 | int r; | |
112 | ||
113 | r = cg_get_path(controller, path, "cgroup.events", &events); | |
114 | if (r < 0) | |
115 | return r; | |
116 | ||
117 | r = read_full_file(events, &content, NULL); | |
118 | if (r < 0) | |
119 | return r; | |
120 | ||
121 | p = content; | |
122 | while ((line = strsep(&p, "\n"))) { | |
123 | char *key; | |
124 | ||
125 | key = strsep(&line, " "); | |
126 | if (!key || !line) | |
127 | return -EINVAL; | |
128 | ||
129 | if (strcmp(key, event)) | |
130 | continue; | |
131 | ||
132 | *val = strdup(line); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | return -ENOENT; | |
137 | } | |
138 | ||
3228995c CB |
139 | bool cg_ns_supported(void) { |
140 | static thread_local int enabled = -1; | |
141 | ||
142 | if (enabled >= 0) | |
143 | return enabled; | |
144 | ||
145 | if (access("/proc/self/ns/cgroup", F_OK) == 0) | |
146 | enabled = 1; | |
147 | else | |
148 | enabled = 0; | |
149 | ||
150 | return enabled; | |
151 | } | |
152 | ||
35d2e7ec | 153 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
7027ff61 | 154 | _cleanup_free_ char *fs = NULL; |
35d2e7ec LP |
155 | int r; |
156 | DIR *d; | |
157 | ||
35d2e7ec LP |
158 | assert(_d); |
159 | ||
160 | /* This is not recursive! */ | |
161 | ||
c3175a7f LP |
162 | r = cg_get_path(controller, path, NULL, &fs); |
163 | if (r < 0) | |
35d2e7ec LP |
164 | return r; |
165 | ||
166 | d = opendir(fs); | |
35d2e7ec LP |
167 | if (!d) |
168 | return -errno; | |
169 | ||
170 | *_d = d; | |
171 | return 0; | |
172 | } | |
173 | ||
174 | int cg_read_subgroup(DIR *d, char **fn) { | |
175 | struct dirent *de; | |
176 | ||
177 | assert(d); | |
7027ff61 | 178 | assert(fn); |
35d2e7ec | 179 | |
f01327ad | 180 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
35d2e7ec LP |
181 | char *b; |
182 | ||
183 | if (de->d_type != DT_DIR) | |
184 | continue; | |
185 | ||
49bfc877 | 186 | if (dot_or_dot_dot(de->d_name)) |
35d2e7ec LP |
187 | continue; |
188 | ||
7027ff61 LP |
189 | b = strdup(de->d_name); |
190 | if (!b) | |
35d2e7ec LP |
191 | return -ENOMEM; |
192 | ||
193 | *fn = b; | |
194 | return 1; | |
195 | } | |
196 | ||
35d2e7ec LP |
197 | return 0; |
198 | } | |
199 | ||
4ad49000 | 200 | int cg_rmdir(const char *controller, const char *path) { |
7027ff61 | 201 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
202 | int r; |
203 | ||
ad293f5a LP |
204 | r = cg_get_path(controller, path, NULL, &p); |
205 | if (r < 0) | |
35d2e7ec LP |
206 | return r; |
207 | ||
208 | r = rmdir(p); | |
7027ff61 LP |
209 | if (r < 0 && errno != ENOENT) |
210 | return -errno; | |
35d2e7ec | 211 | |
b4cccbc1 LP |
212 | r = cg_hybrid_unified(); |
213 | if (r < 0) | |
214 | return r; | |
215 | if (r == 0) | |
216 | return 0; | |
217 | ||
218 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
219 | r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path); |
220 | if (r < 0) | |
221 | log_warning_errno(r, "Failed to remove compat systemd cgroup %s: %m", path); | |
222 | } | |
223 | ||
7027ff61 | 224 | return 0; |
35d2e7ec LP |
225 | } |
226 | ||
1d98fef1 LP |
227 | int cg_kill( |
228 | const char *controller, | |
229 | const char *path, | |
230 | int sig, | |
231 | CGroupFlags flags, | |
232 | Set *s, | |
233 | cg_kill_log_func_t log_kill, | |
234 | void *userdata) { | |
235 | ||
7027ff61 | 236 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 237 | bool done = false; |
8c6db833 | 238 | int r, ret = 0; |
35d2e7ec | 239 | pid_t my_pid; |
8c6db833 | 240 | |
8c6db833 LP |
241 | assert(sig >= 0); |
242 | ||
0d5b4810 LP |
243 | /* Don't send SIGCONT twice. Also, SIGKILL always works even when process is suspended, hence don't send |
244 | * SIGCONT on SIGKILL. */ | |
245 | if (IN_SET(sig, SIGCONT, SIGKILL)) | |
246 | flags &= ~CGROUP_SIGCONT; | |
247 | ||
8c6db833 LP |
248 | /* This goes through the tasks list and kills them all. This |
249 | * is repeated until no further processes are added to the | |
250 | * tasks list, to properly handle forking processes */ | |
251 | ||
7027ff61 | 252 | if (!s) { |
d5099efc | 253 | s = allocated_set = set_new(NULL); |
7027ff61 | 254 | if (!s) |
ca949c9d | 255 | return -ENOMEM; |
7027ff61 | 256 | } |
8c6db833 | 257 | |
df0ff127 | 258 | my_pid = getpid_cached(); |
8c6db833 LP |
259 | |
260 | do { | |
7027ff61 | 261 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 262 | pid_t pid = 0; |
8c6db833 LP |
263 | done = true; |
264 | ||
7027ff61 LP |
265 | r = cg_enumerate_processes(controller, path, &f); |
266 | if (r < 0) { | |
4c633005 | 267 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 268 | return r; |
35d2e7ec | 269 | |
7027ff61 | 270 | return ret; |
35d2e7ec | 271 | } |
c6c18be3 LP |
272 | |
273 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 274 | |
1d98fef1 | 275 | if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid) |
c6c18be3 | 276 | continue; |
8c6db833 | 277 | |
fea72cc0 | 278 | if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) |
c6c18be3 | 279 | continue; |
8c6db833 | 280 | |
1d98fef1 LP |
281 | if (log_kill) |
282 | log_kill(pid, sig, userdata); | |
283 | ||
8c6db833 LP |
284 | /* If we haven't killed this process yet, kill |
285 | * it */ | |
4c633005 LP |
286 | if (kill(pid, sig) < 0) { |
287 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 288 | ret = -errno; |
6e8314c4 | 289 | } else { |
1d98fef1 | 290 | if (flags & CGROUP_SIGCONT) |
e155a0aa | 291 | (void) kill(pid, SIGCONT); |
430c18ed | 292 | |
6e8314c4 LP |
293 | if (ret == 0) |
294 | ret = 1; | |
430c18ed | 295 | } |
8c6db833 | 296 | |
8c6db833 LP |
297 | done = false; |
298 | ||
fea72cc0 | 299 | r = set_put(s, PID_TO_PTR(pid)); |
7027ff61 | 300 | if (r < 0) { |
35d2e7ec | 301 | if (ret >= 0) |
7027ff61 | 302 | return r; |
35d2e7ec | 303 | |
7027ff61 | 304 | return ret; |
35d2e7ec LP |
305 | } |
306 | } | |
307 | ||
308 | if (r < 0) { | |
309 | if (ret >= 0) | |
7027ff61 | 310 | return r; |
35d2e7ec | 311 | |
7027ff61 | 312 | return ret; |
8c6db833 LP |
313 | } |
314 | ||
8c6db833 LP |
315 | /* To avoid racing against processes which fork |
316 | * quicker than we can kill them we repeat this until | |
317 | * no new pids need to be killed. */ | |
318 | ||
35d2e7ec | 319 | } while (!done); |
8c6db833 | 320 | |
35d2e7ec | 321 | return ret; |
8c6db833 LP |
322 | } |
323 | ||
1d98fef1 LP |
324 | int cg_kill_recursive( |
325 | const char *controller, | |
326 | const char *path, | |
327 | int sig, | |
328 | CGroupFlags flags, | |
329 | Set *s, | |
330 | cg_kill_log_func_t log_kill, | |
331 | void *userdata) { | |
332 | ||
7027ff61 LP |
333 | _cleanup_set_free_ Set *allocated_set = NULL; |
334 | _cleanup_closedir_ DIR *d = NULL; | |
e155a0aa | 335 | int r, ret; |
35d2e7ec | 336 | char *fn; |
8c6db833 LP |
337 | |
338 | assert(path); | |
8c6db833 LP |
339 | assert(sig >= 0); |
340 | ||
7027ff61 | 341 | if (!s) { |
d5099efc | 342 | s = allocated_set = set_new(NULL); |
7027ff61 | 343 | if (!s) |
ca949c9d | 344 | return -ENOMEM; |
7027ff61 | 345 | } |
ca949c9d | 346 | |
1d98fef1 | 347 | ret = cg_kill(controller, path, sig, flags, s, log_kill, userdata); |
8c6db833 | 348 | |
7027ff61 LP |
349 | r = cg_enumerate_subgroups(controller, path, &d); |
350 | if (r < 0) { | |
4c633005 | 351 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 352 | return r; |
8c6db833 | 353 | |
7027ff61 | 354 | return ret; |
35d2e7ec | 355 | } |
8c6db833 | 356 | |
35d2e7ec | 357 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 358 | _cleanup_free_ char *p = NULL; |
8c6db833 | 359 | |
605405c6 | 360 | p = strjoin(path, "/", fn); |
35d2e7ec | 361 | free(fn); |
7027ff61 LP |
362 | if (!p) |
363 | return -ENOMEM; | |
8c6db833 | 364 | |
1d98fef1 | 365 | r = cg_kill_recursive(controller, p, sig, flags, s, log_kill, userdata); |
e155a0aa | 366 | if (r != 0 && ret >= 0) |
35d2e7ec | 367 | ret = r; |
8c6db833 | 368 | } |
7027ff61 | 369 | if (ret >= 0 && r < 0) |
35d2e7ec LP |
370 | ret = r; |
371 | ||
1d98fef1 | 372 | if (flags & CGROUP_REMOVE) { |
4ad49000 | 373 | r = cg_rmdir(controller, path); |
7027ff61 LP |
374 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
375 | return r; | |
376 | } | |
ca949c9d | 377 | |
8c6db833 LP |
378 | return ret; |
379 | } | |
380 | ||
1d98fef1 LP |
381 | int cg_migrate( |
382 | const char *cfrom, | |
383 | const char *pfrom, | |
384 | const char *cto, | |
385 | const char *pto, | |
386 | CGroupFlags flags) { | |
387 | ||
35d2e7ec | 388 | bool done = false; |
246aa6dd | 389 | _cleanup_set_free_ Set *s = NULL; |
8c6db833 LP |
390 | int r, ret = 0; |
391 | pid_t my_pid; | |
392 | ||
246aa6dd LP |
393 | assert(cfrom); |
394 | assert(pfrom); | |
395 | assert(cto); | |
396 | assert(pto); | |
8c6db833 | 397 | |
d5099efc | 398 | s = set_new(NULL); |
246aa6dd | 399 | if (!s) |
35d2e7ec LP |
400 | return -ENOMEM; |
401 | ||
df0ff127 | 402 | my_pid = getpid_cached(); |
8c6db833 LP |
403 | |
404 | do { | |
7027ff61 | 405 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 406 | pid_t pid = 0; |
8c6db833 LP |
407 | done = true; |
408 | ||
b043cd0b | 409 | r = cg_enumerate_processes(cfrom, pfrom, &f); |
246aa6dd | 410 | if (r < 0) { |
4c633005 | 411 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 412 | return r; |
35d2e7ec | 413 | |
246aa6dd | 414 | return ret; |
35d2e7ec | 415 | } |
c6c18be3 LP |
416 | |
417 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 418 | |
35d2e7ec LP |
419 | /* This might do weird stuff if we aren't a |
420 | * single-threaded program. However, we | |
421 | * luckily know we are not */ | |
1d98fef1 | 422 | if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid) |
c6c18be3 | 423 | continue; |
8c6db833 | 424 | |
fea72cc0 | 425 | if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) |
35d2e7ec LP |
426 | continue; |
427 | ||
9b84c7f9 LP |
428 | /* Ignore kernel threads. Since they can only |
429 | * exist in the root cgroup, we only check for | |
430 | * them there. */ | |
431 | if (cfrom && | |
432 | (isempty(pfrom) || path_equal(pfrom, "/")) && | |
433 | is_kernel_thread(pid) > 0) | |
434 | continue; | |
435 | ||
246aa6dd LP |
436 | r = cg_attach(cto, pto, pid); |
437 | if (r < 0) { | |
4c633005 | 438 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
439 | ret = r; |
440 | } else if (ret == 0) | |
441 | ret = 1; | |
8c6db833 | 442 | |
8c6db833 | 443 | done = false; |
35d2e7ec | 444 | |
fea72cc0 | 445 | r = set_put(s, PID_TO_PTR(pid)); |
246aa6dd | 446 | if (r < 0) { |
35d2e7ec | 447 | if (ret >= 0) |
7027ff61 | 448 | return r; |
35d2e7ec | 449 | |
246aa6dd | 450 | return ret; |
35d2e7ec LP |
451 | } |
452 | } | |
453 | ||
454 | if (r < 0) { | |
455 | if (ret >= 0) | |
7027ff61 | 456 | return r; |
35d2e7ec | 457 | |
246aa6dd | 458 | return ret; |
8c6db833 | 459 | } |
35d2e7ec | 460 | } while (!done); |
8c6db833 | 461 | |
35d2e7ec | 462 | return ret; |
8c6db833 LP |
463 | } |
464 | ||
4ad49000 LP |
465 | int cg_migrate_recursive( |
466 | const char *cfrom, | |
467 | const char *pfrom, | |
468 | const char *cto, | |
469 | const char *pto, | |
1d98fef1 | 470 | CGroupFlags flags) { |
4ad49000 | 471 | |
246aa6dd | 472 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 473 | int r, ret = 0; |
35d2e7ec | 474 | char *fn; |
8c6db833 | 475 | |
246aa6dd LP |
476 | assert(cfrom); |
477 | assert(pfrom); | |
478 | assert(cto); | |
479 | assert(pto); | |
8c6db833 | 480 | |
1d98fef1 | 481 | ret = cg_migrate(cfrom, pfrom, cto, pto, flags); |
8c6db833 | 482 | |
246aa6dd LP |
483 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
484 | if (r < 0) { | |
4c633005 | 485 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
486 | return r; |
487 | ||
246aa6dd | 488 | return ret; |
35d2e7ec LP |
489 | } |
490 | ||
491 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 492 | _cleanup_free_ char *p = NULL; |
8c6db833 | 493 | |
605405c6 | 494 | p = strjoin(pfrom, "/", fn); |
35d2e7ec | 495 | free(fn); |
e155a0aa LP |
496 | if (!p) |
497 | return -ENOMEM; | |
8c6db833 | 498 | |
1d98fef1 | 499 | r = cg_migrate_recursive(cfrom, p, cto, pto, flags); |
35d2e7ec LP |
500 | if (r != 0 && ret >= 0) |
501 | ret = r; | |
8c6db833 LP |
502 | } |
503 | ||
35d2e7ec LP |
504 | if (r < 0 && ret >= 0) |
505 | ret = r; | |
506 | ||
1d98fef1 | 507 | if (flags & CGROUP_REMOVE) { |
4ad49000 | 508 | r = cg_rmdir(cfrom, pfrom); |
246aa6dd LP |
509 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
510 | return r; | |
511 | } | |
8c6db833 LP |
512 | |
513 | return ret; | |
514 | } | |
515 | ||
13b84ec7 LP |
516 | int cg_migrate_recursive_fallback( |
517 | const char *cfrom, | |
518 | const char *pfrom, | |
519 | const char *cto, | |
520 | const char *pto, | |
1d98fef1 | 521 | CGroupFlags flags) { |
13b84ec7 LP |
522 | |
523 | int r; | |
524 | ||
525 | assert(cfrom); | |
526 | assert(pfrom); | |
527 | assert(cto); | |
528 | assert(pto); | |
529 | ||
1d98fef1 | 530 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, flags); |
13b84ec7 LP |
531 | if (r < 0) { |
532 | char prefix[strlen(pto) + 1]; | |
533 | ||
534 | /* This didn't work? Then let's try all prefixes of the destination */ | |
535 | ||
fecffe5d | 536 | PATH_FOREACH_PREFIX(prefix, pto) { |
e155a0aa LP |
537 | int q; |
538 | ||
1d98fef1 | 539 | q = cg_migrate_recursive(cfrom, pfrom, cto, prefix, flags); |
e155a0aa LP |
540 | if (q >= 0) |
541 | return q; | |
13b84ec7 LP |
542 | } |
543 | } | |
544 | ||
e155a0aa | 545 | return r; |
13b84ec7 LP |
546 | } |
547 | ||
efdb0237 LP |
548 | static const char *controller_to_dirname(const char *controller) { |
549 | const char *e; | |
3474ae3c | 550 | |
7027ff61 LP |
551 | assert(controller); |
552 | ||
efdb0237 LP |
553 | /* Converts a controller name to the directory name below |
554 | * /sys/fs/cgroup/ we want to mount it to. Effectively, this | |
555 | * just cuts off the name= prefixed used for named | |
556 | * hierarchies, if it is specified. */ | |
557 | ||
2977724b | 558 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { |
b4cccbc1 | 559 | if (cg_hybrid_unified() > 0) |
2977724b TH |
560 | controller = SYSTEMD_CGROUP_CONTROLLER_HYBRID; |
561 | else | |
562 | controller = SYSTEMD_CGROUP_CONTROLLER_LEGACY; | |
563 | } | |
b6629c4b | 564 | |
efdb0237 LP |
565 | e = startswith(controller, "name="); |
566 | if (e) | |
567 | return e; | |
568 | ||
569 | return controller; | |
3474ae3c LP |
570 | } |
571 | ||
569b19d8 LP |
572 | static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) { |
573 | const char *dn; | |
018ef268 | 574 | char *t = NULL; |
3474ae3c | 575 | |
efdb0237 | 576 | assert(fs); |
569b19d8 LP |
577 | assert(controller); |
578 | ||
579 | dn = controller_to_dirname(controller); | |
efdb0237 LP |
580 | |
581 | if (isempty(path) && isempty(suffix)) | |
569b19d8 | 582 | t = strappend("/sys/fs/cgroup/", dn); |
efdb0237 | 583 | else if (isempty(path)) |
605405c6 | 584 | t = strjoin("/sys/fs/cgroup/", dn, "/", suffix); |
efdb0237 | 585 | else if (isempty(suffix)) |
605405c6 | 586 | t = strjoin("/sys/fs/cgroup/", dn, "/", path); |
efdb0237 | 587 | else |
605405c6 | 588 | t = strjoin("/sys/fs/cgroup/", dn, "/", path, "/", suffix); |
efdb0237 LP |
589 | if (!t) |
590 | return -ENOMEM; | |
3474ae3c | 591 | |
efdb0237 LP |
592 | *fs = t; |
593 | return 0; | |
594 | } | |
595 | ||
596 | static int join_path_unified(const char *path, const char *suffix, char **fs) { | |
597 | char *t; | |
598 | ||
599 | assert(fs); | |
600 | ||
601 | if (isempty(path) && isempty(suffix)) | |
602 | t = strdup("/sys/fs/cgroup"); | |
603 | else if (isempty(path)) | |
604 | t = strappend("/sys/fs/cgroup/", suffix); | |
605 | else if (isempty(suffix)) | |
606 | t = strappend("/sys/fs/cgroup/", path); | |
607 | else | |
605405c6 | 608 | t = strjoin("/sys/fs/cgroup/", path, "/", suffix); |
3474ae3c LP |
609 | if (!t) |
610 | return -ENOMEM; | |
611 | ||
efdb0237 | 612 | *fs = t; |
3474ae3c LP |
613 | return 0; |
614 | } | |
615 | ||
8c6db833 | 616 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
415fc41c | 617 | int r; |
8c6db833 | 618 | |
dbd821ac LP |
619 | assert(fs); |
620 | ||
efdb0237 LP |
621 | if (!controller) { |
622 | char *t; | |
623 | ||
569b19d8 LP |
624 | /* If no controller is specified, we return the path |
625 | * *below* the controllers, without any prefix. */ | |
efdb0237 LP |
626 | |
627 | if (!path && !suffix) | |
628 | return -EINVAL; | |
629 | ||
989189ea | 630 | if (!suffix) |
efdb0237 | 631 | t = strdup(path); |
989189ea | 632 | else if (!path) |
efdb0237 LP |
633 | t = strdup(suffix); |
634 | else | |
605405c6 | 635 | t = strjoin(path, "/", suffix); |
efdb0237 LP |
636 | if (!t) |
637 | return -ENOMEM; | |
638 | ||
639 | *fs = path_kill_slashes(t); | |
640 | return 0; | |
641 | } | |
642 | ||
643 | if (!cg_controller_is_valid(controller)) | |
78edb35a LP |
644 | return -EINVAL; |
645 | ||
b4cccbc1 LP |
646 | r = cg_all_unified(); |
647 | if (r < 0) | |
648 | return r; | |
649 | if (r > 0) | |
efdb0237 | 650 | r = join_path_unified(path, suffix, fs); |
569b19d8 LP |
651 | else |
652 | r = join_path_legacy(controller, path, suffix, fs); | |
efdb0237 LP |
653 | if (r < 0) |
654 | return r; | |
7027ff61 | 655 | |
efdb0237 LP |
656 | path_kill_slashes(*fs); |
657 | return 0; | |
3474ae3c | 658 | } |
dbd821ac | 659 | |
efdb0237 | 660 | static int controller_is_accessible(const char *controller) { |
b4cccbc1 | 661 | int r; |
37099707 | 662 | |
efdb0237 | 663 | assert(controller); |
37099707 | 664 | |
efdb0237 LP |
665 | /* Checks whether a specific controller is accessible, |
666 | * i.e. its hierarchy mounted. In the unified hierarchy all | |
667 | * controllers are considered accessible, except for the named | |
668 | * hierarchies */ | |
b12afc8c | 669 | |
efdb0237 LP |
670 | if (!cg_controller_is_valid(controller)) |
671 | return -EINVAL; | |
672 | ||
b4cccbc1 LP |
673 | r = cg_all_unified(); |
674 | if (r < 0) | |
675 | return r; | |
676 | if (r > 0) { | |
efdb0237 LP |
677 | /* We don't support named hierarchies if we are using |
678 | * the unified hierarchy. */ | |
679 | ||
680 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
681 | return 0; | |
682 | ||
683 | if (startswith(controller, "name=")) | |
684 | return -EOPNOTSUPP; | |
685 | ||
686 | } else { | |
687 | const char *cc, *dn; | |
688 | ||
689 | dn = controller_to_dirname(controller); | |
690 | cc = strjoina("/sys/fs/cgroup/", dn); | |
691 | ||
692 | if (laccess(cc, F_OK) < 0) | |
693 | return -errno; | |
694 | } | |
37099707 LP |
695 | |
696 | return 0; | |
697 | } | |
698 | ||
3474ae3c | 699 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
37099707 | 700 | int r; |
dbd821ac | 701 | |
efdb0237 | 702 | assert(controller); |
3474ae3c | 703 | assert(fs); |
70132bd0 | 704 | |
efdb0237 LP |
705 | /* Check if the specified controller is actually accessible */ |
706 | r = controller_is_accessible(controller); | |
37099707 LP |
707 | if (r < 0) |
708 | return r; | |
3474ae3c | 709 | |
efdb0237 | 710 | return cg_get_path(controller, path, suffix, fs); |
8c6db833 LP |
711 | } |
712 | ||
e27796a0 | 713 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
4ad49000 LP |
714 | assert(path); |
715 | assert(sb); | |
716 | assert(ftwbuf); | |
e27796a0 LP |
717 | |
718 | if (typeflag != FTW_DP) | |
719 | return 0; | |
720 | ||
721 | if (ftwbuf->level < 1) | |
722 | return 0; | |
723 | ||
e155a0aa | 724 | (void) rmdir(path); |
e27796a0 LP |
725 | return 0; |
726 | } | |
727 | ||
8c6db833 | 728 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 729 | _cleanup_free_ char *fs = NULL; |
2977724b | 730 | int r = 0, q; |
8c6db833 | 731 | |
8c6db833 LP |
732 | assert(path); |
733 | ||
e27796a0 LP |
734 | r = cg_get_path(controller, path, NULL, &fs); |
735 | if (r < 0) | |
8c6db833 LP |
736 | return r; |
737 | ||
e27796a0 | 738 | errno = 0; |
e155a0aa LP |
739 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) { |
740 | if (errno == ENOENT) | |
741 | r = 0; | |
b3267152 | 742 | else if (errno > 0) |
e155a0aa LP |
743 | r = -errno; |
744 | else | |
745 | r = -EIO; | |
746 | } | |
e27796a0 LP |
747 | |
748 | if (delete_root) { | |
4ad49000 LP |
749 | if (rmdir(fs) < 0 && errno != ENOENT) |
750 | return -errno; | |
e27796a0 LP |
751 | } |
752 | ||
b4cccbc1 LP |
753 | q = cg_hybrid_unified(); |
754 | if (q < 0) | |
755 | return q; | |
756 | if (q > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
757 | q = cg_trim(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, delete_root); |
758 | if (q < 0) | |
759 | log_warning_errno(q, "Failed to trim compat systemd cgroup %s: %m", path); | |
760 | } | |
761 | ||
e27796a0 | 762 | return r; |
8c6db833 LP |
763 | } |
764 | ||
1434ae6f LP |
765 | int cg_create(const char *controller, const char *path) { |
766 | _cleanup_free_ char *fs = NULL; | |
767 | int r; | |
768 | ||
769 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
770 | if (r < 0) | |
771 | return r; | |
772 | ||
773 | r = mkdir_parents(fs, 0755); | |
774 | if (r < 0) | |
775 | return r; | |
776 | ||
777 | if (mkdir(fs, 0755) < 0) { | |
778 | ||
779 | if (errno == EEXIST) | |
780 | return 0; | |
781 | ||
782 | return -errno; | |
783 | } | |
784 | ||
b4cccbc1 LP |
785 | r = cg_hybrid_unified(); |
786 | if (r < 0) | |
787 | return r; | |
788 | ||
789 | if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
790 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path); |
791 | if (r < 0) | |
792 | log_warning_errno(r, "Failed to create compat systemd cgroup %s: %m", path); | |
793 | } | |
794 | ||
1434ae6f LP |
795 | return 1; |
796 | } | |
797 | ||
798 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
799 | int r, q; | |
800 | ||
801 | assert(pid >= 0); | |
802 | ||
803 | r = cg_create(controller, path); | |
804 | if (r < 0) | |
805 | return r; | |
806 | ||
807 | q = cg_attach(controller, path, pid); | |
808 | if (q < 0) | |
809 | return q; | |
810 | ||
811 | /* This does not remove the cgroup on failure */ | |
812 | return r; | |
813 | } | |
814 | ||
8c6db833 | 815 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
816 | _cleanup_free_ char *fs = NULL; |
817 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
818 | int r; |
819 | ||
8c6db833 LP |
820 | assert(path); |
821 | assert(pid >= 0); | |
822 | ||
b043cd0b | 823 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
3474ae3c | 824 | if (r < 0) |
c6c18be3 | 825 | return r; |
8c6db833 LP |
826 | |
827 | if (pid == 0) | |
df0ff127 | 828 | pid = getpid_cached(); |
8c6db833 | 829 | |
d054f0a4 | 830 | xsprintf(c, PID_FMT "\n", pid); |
8c6db833 | 831 | |
2977724b TH |
832 | r = write_string_file(fs, c, 0); |
833 | if (r < 0) | |
834 | return r; | |
835 | ||
b4cccbc1 LP |
836 | r = cg_hybrid_unified(); |
837 | if (r < 0) | |
838 | return r; | |
839 | ||
840 | if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
841 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, pid); |
842 | if (r < 0) | |
bd68e99b | 843 | log_warning_errno(r, "Failed to attach "PID_FMT" to compat systemd cgroup %s: %m", pid, path); |
2977724b TH |
844 | } |
845 | ||
846 | return 0; | |
8c6db833 LP |
847 | } |
848 | ||
13b84ec7 LP |
849 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
850 | int r; | |
851 | ||
852 | assert(controller); | |
853 | assert(path); | |
854 | assert(pid >= 0); | |
855 | ||
856 | r = cg_attach(controller, path, pid); | |
857 | if (r < 0) { | |
858 | char prefix[strlen(path) + 1]; | |
859 | ||
860 | /* This didn't work? Then let's try all prefixes of | |
861 | * the destination */ | |
862 | ||
fecffe5d | 863 | PATH_FOREACH_PREFIX(prefix, path) { |
e155a0aa LP |
864 | int q; |
865 | ||
866 | q = cg_attach(controller, prefix, pid); | |
867 | if (q >= 0) | |
868 | return q; | |
13b84ec7 LP |
869 | } |
870 | } | |
871 | ||
e155a0aa | 872 | return r; |
13b84ec7 LP |
873 | } |
874 | ||
2d76d14e LP |
875 | int cg_set_group_access( |
876 | const char *controller, | |
877 | const char *path, | |
878 | mode_t mode, | |
879 | uid_t uid, | |
880 | gid_t gid) { | |
881 | ||
574d5f2d | 882 | _cleanup_free_ char *fs = NULL; |
8c6db833 LP |
883 | int r; |
884 | ||
e155a0aa LP |
885 | if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
886 | return 0; | |
8c6db833 | 887 | |
fed1e721 | 888 | if (mode != MODE_INVALID) |
8d53b453 LP |
889 | mode &= 0777; |
890 | ||
891 | r = cg_get_path(controller, path, NULL, &fs); | |
892 | if (r < 0) | |
8c6db833 LP |
893 | return r; |
894 | ||
2977724b TH |
895 | r = chmod_and_chown(fs, mode, uid, gid); |
896 | if (r < 0) | |
897 | return r; | |
898 | ||
b4cccbc1 LP |
899 | r = cg_hybrid_unified(); |
900 | if (r < 0) | |
901 | return r; | |
902 | if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
903 | r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, mode, uid, gid); |
904 | if (r < 0) | |
905 | log_warning_errno(r, "Failed to set group access on compat systemd cgroup %s: %m", path); | |
906 | } | |
907 | ||
908 | return 0; | |
8c6db833 LP |
909 | } |
910 | ||
974efc46 LP |
911 | int cg_set_task_access( |
912 | const char *controller, | |
913 | const char *path, | |
914 | mode_t mode, | |
915 | uid_t uid, | |
4ad49000 | 916 | gid_t gid) { |
974efc46 LP |
917 | |
918 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
415fc41c | 919 | int r; |
8c6db833 | 920 | |
8c6db833 LP |
921 | assert(path); |
922 | ||
fed1e721 | 923 | if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
8d53b453 LP |
924 | return 0; |
925 | ||
fed1e721 | 926 | if (mode != MODE_INVALID) |
8d53b453 LP |
927 | mode &= 0666; |
928 | ||
b043cd0b | 929 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
8d53b453 | 930 | if (r < 0) |
8c6db833 LP |
931 | return r; |
932 | ||
933 | r = chmod_and_chown(fs, mode, uid, gid); | |
974efc46 LP |
934 | if (r < 0) |
935 | return r; | |
8c6db833 | 936 | |
c22800e4 | 937 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
938 | if (r < 0) |
939 | return r; | |
940 | if (r == 0) { | |
2977724b TH |
941 | /* Compatibility, Always keep values for "tasks" in sync with |
942 | * "cgroup.procs" */ | |
943 | if (cg_get_path(controller, path, "tasks", &procs) >= 0) | |
944 | (void) chmod_and_chown(procs, mode, uid, gid); | |
945 | } | |
efdb0237 | 946 | |
b4cccbc1 LP |
947 | r = cg_hybrid_unified(); |
948 | if (r < 0) | |
949 | return r; | |
950 | if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
951 | r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, mode, uid, gid); |
952 | if (r < 0) | |
953 | log_warning_errno(r, "Failed to set task access on compat systemd cgroup %s: %m", path); | |
954 | } | |
974efc46 | 955 | |
efdb0237 | 956 | return 0; |
8c6db833 LP |
957 | } |
958 | ||
4b58153d LP |
959 | int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags) { |
960 | _cleanup_free_ char *fs = NULL; | |
961 | int r; | |
962 | ||
963 | assert(path); | |
964 | assert(name); | |
965 | assert(value || size <= 0); | |
966 | ||
967 | r = cg_get_path(controller, path, NULL, &fs); | |
968 | if (r < 0) | |
969 | return r; | |
970 | ||
971 | if (setxattr(fs, name, value, size, flags) < 0) | |
972 | return -errno; | |
973 | ||
974 | return 0; | |
975 | } | |
976 | ||
977 | int cg_get_xattr(const char *controller, const char *path, const char *name, void *value, size_t size) { | |
978 | _cleanup_free_ char *fs = NULL; | |
979 | ssize_t n; | |
980 | int r; | |
981 | ||
982 | assert(path); | |
983 | assert(name); | |
984 | ||
985 | r = cg_get_path(controller, path, NULL, &fs); | |
986 | if (r < 0) | |
987 | return r; | |
988 | ||
989 | n = getxattr(fs, name, value, size); | |
990 | if (n < 0) | |
991 | return -errno; | |
992 | ||
993 | return (int) n; | |
994 | } | |
995 | ||
7027ff61 | 996 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
7027ff61 LP |
997 | _cleanup_fclose_ FILE *f = NULL; |
998 | char line[LINE_MAX]; | |
b6629c4b | 999 | const char *fs, *controller_str; |
efdb0237 | 1000 | size_t cs = 0; |
b4cccbc1 | 1001 | int unified; |
8c6db833 | 1002 | |
8c6db833 | 1003 | assert(path); |
c6c18be3 | 1004 | assert(pid >= 0); |
8c6db833 | 1005 | |
5da38d07 TH |
1006 | if (controller) { |
1007 | if (!cg_controller_is_valid(controller)) | |
1008 | return -EINVAL; | |
1009 | } else | |
1010 | controller = SYSTEMD_CGROUP_CONTROLLER; | |
1011 | ||
c22800e4 | 1012 | unified = cg_unified_controller(controller); |
b4cccbc1 LP |
1013 | if (unified < 0) |
1014 | return unified; | |
1015 | if (unified == 0) { | |
b6629c4b TH |
1016 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
1017 | controller_str = SYSTEMD_CGROUP_CONTROLLER_LEGACY; | |
1018 | else | |
1019 | controller_str = controller; | |
1020 | ||
1021 | cs = strlen(controller_str); | |
1022 | } | |
7027ff61 | 1023 | |
b68fa010 | 1024 | fs = procfs_file_alloca(pid, "cgroup"); |
c6c18be3 | 1025 | f = fopen(fs, "re"); |
4c633005 LP |
1026 | if (!f) |
1027 | return errno == ENOENT ? -ESRCH : -errno; | |
1028 | ||
7027ff61 | 1029 | FOREACH_LINE(line, f, return -errno) { |
efdb0237 | 1030 | char *e, *p; |
c6c18be3 LP |
1031 | |
1032 | truncate_nl(line); | |
1033 | ||
efdb0237 LP |
1034 | if (unified) { |
1035 | e = startswith(line, "0:"); | |
1036 | if (!e) | |
1037 | continue; | |
c6c18be3 | 1038 | |
efdb0237 LP |
1039 | e = strchr(e, ':'); |
1040 | if (!e) | |
1041 | continue; | |
1042 | } else { | |
1043 | char *l; | |
1044 | size_t k; | |
1045 | const char *word, *state; | |
1046 | bool found = false; | |
1047 | ||
1048 | l = strchr(line, ':'); | |
1049 | if (!l) | |
1050 | continue; | |
8af8afd6 | 1051 | |
efdb0237 LP |
1052 | l++; |
1053 | e = strchr(l, ':'); | |
1054 | if (!e) | |
1055 | continue; | |
8af8afd6 | 1056 | |
efdb0237 LP |
1057 | *e = 0; |
1058 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { | |
b6629c4b | 1059 | if (k == cs && memcmp(word, controller_str, cs) == 0) { |
efdb0237 LP |
1060 | found = true; |
1061 | break; | |
1062 | } | |
8af8afd6 LP |
1063 | } |
1064 | ||
efdb0237 LP |
1065 | if (!found) |
1066 | continue; | |
8af8afd6 LP |
1067 | } |
1068 | ||
8af8afd6 | 1069 | p = strdup(e + 1); |
7027ff61 LP |
1070 | if (!p) |
1071 | return -ENOMEM; | |
c6c18be3 LP |
1072 | |
1073 | *path = p; | |
7027ff61 | 1074 | return 0; |
c6c18be3 LP |
1075 | } |
1076 | ||
1c80e425 | 1077 | return -ENODATA; |
8c6db833 LP |
1078 | } |
1079 | ||
1080 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 | 1081 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
efdb0237 | 1082 | const char *sc; |
415fc41c | 1083 | int r; |
8c6db833 | 1084 | |
8c6db833 LP |
1085 | assert(agent); |
1086 | ||
c22800e4 | 1087 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
1088 | if (r < 0) |
1089 | return r; | |
1090 | if (r > 0) /* doesn't apply to unified hierarchy */ | |
efdb0237 LP |
1091 | return -EOPNOTSUPP; |
1092 | ||
7027ff61 LP |
1093 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
1094 | if (r < 0) | |
c6c18be3 | 1095 | return r; |
8c6db833 | 1096 | |
7027ff61 LP |
1097 | r = read_one_line_file(fs, &contents); |
1098 | if (r < 0) | |
1099 | return r; | |
8c6db833 LP |
1100 | |
1101 | sc = strstrip(contents); | |
e155a0aa | 1102 | if (isempty(sc)) { |
4c1fc3e4 | 1103 | r = write_string_file(fs, agent, 0); |
574d5f2d | 1104 | if (r < 0) |
7027ff61 | 1105 | return r; |
b8725df8 | 1106 | } else if (!path_equal(sc, agent)) |
7027ff61 | 1107 | return -EEXIST; |
8c6db833 | 1108 | |
0da16248 | 1109 | fs = mfree(fs); |
7027ff61 LP |
1110 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
1111 | if (r < 0) | |
1112 | return r; | |
8c6db833 | 1113 | |
0da16248 | 1114 | contents = mfree(contents); |
7027ff61 LP |
1115 | r = read_one_line_file(fs, &contents); |
1116 | if (r < 0) | |
1117 | return r; | |
8c6db833 LP |
1118 | |
1119 | sc = strstrip(contents); | |
8c6db833 | 1120 | if (streq(sc, "0")) { |
4c1fc3e4 | 1121 | r = write_string_file(fs, "1", 0); |
7027ff61 LP |
1122 | if (r < 0) |
1123 | return r; | |
c6c18be3 | 1124 | |
7027ff61 LP |
1125 | return 1; |
1126 | } | |
8c6db833 | 1127 | |
7027ff61 LP |
1128 | if (!streq(sc, "1")) |
1129 | return -EIO; | |
8c6db833 | 1130 | |
7027ff61 | 1131 | return 0; |
8c6db833 LP |
1132 | } |
1133 | ||
ad929bcc KS |
1134 | int cg_uninstall_release_agent(const char *controller) { |
1135 | _cleanup_free_ char *fs = NULL; | |
415fc41c | 1136 | int r; |
efdb0237 | 1137 | |
c22800e4 | 1138 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
1139 | if (r < 0) |
1140 | return r; | |
1141 | if (r > 0) /* Doesn't apply to unified hierarchy */ | |
efdb0237 | 1142 | return -EOPNOTSUPP; |
ad929bcc | 1143 | |
ac9ef333 LP |
1144 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
1145 | if (r < 0) | |
1146 | return r; | |
1147 | ||
4c1fc3e4 | 1148 | r = write_string_file(fs, "0", 0); |
ac9ef333 LP |
1149 | if (r < 0) |
1150 | return r; | |
1151 | ||
0da16248 | 1152 | fs = mfree(fs); |
ac9ef333 | 1153 | |
ad929bcc KS |
1154 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
1155 | if (r < 0) | |
1156 | return r; | |
1157 | ||
4c1fc3e4 | 1158 | r = write_string_file(fs, "", 0); |
ad929bcc KS |
1159 | if (r < 0) |
1160 | return r; | |
1161 | ||
ac9ef333 | 1162 | return 0; |
ad929bcc KS |
1163 | } |
1164 | ||
6f883237 | 1165 | int cg_is_empty(const char *controller, const char *path) { |
7027ff61 | 1166 | _cleanup_fclose_ FILE *f = NULL; |
efdb0237 | 1167 | pid_t pid; |
7027ff61 | 1168 | int r; |
8c6db833 | 1169 | |
8c6db833 LP |
1170 | assert(path); |
1171 | ||
b043cd0b | 1172 | r = cg_enumerate_processes(controller, path, &f); |
6f883237 LP |
1173 | if (r == -ENOENT) |
1174 | return 1; | |
c3175a7f | 1175 | if (r < 0) |
6f883237 | 1176 | return r; |
8c6db833 | 1177 | |
6f883237 | 1178 | r = cg_read_pid(f, &pid); |
c6c18be3 LP |
1179 | if (r < 0) |
1180 | return r; | |
8c6db833 | 1181 | |
6f883237 | 1182 | return r == 0; |
8c6db833 LP |
1183 | } |
1184 | ||
6f883237 | 1185 | int cg_is_empty_recursive(const char *controller, const char *path) { |
415fc41c | 1186 | int r; |
8c6db833 | 1187 | |
8c6db833 LP |
1188 | assert(path); |
1189 | ||
6fd66507 LP |
1190 | /* The root cgroup is always populated */ |
1191 | if (controller && (isempty(path) || path_equal(path, "/"))) | |
efdb0237 | 1192 | return false; |
6fd66507 | 1193 | |
c22800e4 | 1194 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
1195 | if (r < 0) |
1196 | return r; | |
1197 | if (r > 0) { | |
ab2c3861 | 1198 | _cleanup_free_ char *t = NULL; |
8c6db833 | 1199 | |
efdb0237 | 1200 | /* On the unified hierarchy we can check empty state |
ab2c3861 | 1201 | * via the "populated" attribute of "cgroup.events". */ |
8c6db833 | 1202 | |
ab2c3861 | 1203 | r = cg_read_event(controller, path, "populated", &t); |
efdb0237 LP |
1204 | if (r < 0) |
1205 | return r; | |
1206 | ||
1207 | return streq(t, "0"); | |
1208 | } else { | |
1209 | _cleanup_closedir_ DIR *d = NULL; | |
1210 | char *fn; | |
8c6db833 | 1211 | |
efdb0237 | 1212 | r = cg_is_empty(controller, path); |
35d2e7ec | 1213 | if (r <= 0) |
7027ff61 | 1214 | return r; |
35d2e7ec | 1215 | |
efdb0237 LP |
1216 | r = cg_enumerate_subgroups(controller, path, &d); |
1217 | if (r == -ENOENT) | |
1218 | return 1; | |
1219 | if (r < 0) | |
1220 | return r; | |
35d2e7ec | 1221 | |
efdb0237 LP |
1222 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
1223 | _cleanup_free_ char *p = NULL; | |
1224 | ||
605405c6 | 1225 | p = strjoin(path, "/", fn); |
efdb0237 LP |
1226 | free(fn); |
1227 | if (!p) | |
1228 | return -ENOMEM; | |
1229 | ||
1230 | r = cg_is_empty_recursive(controller, p); | |
1231 | if (r <= 0) | |
1232 | return r; | |
1233 | } | |
1234 | if (r < 0) | |
1235 | return r; | |
1236 | ||
1237 | return true; | |
1238 | } | |
35d2e7ec LP |
1239 | } |
1240 | ||
1241 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
35d2e7ec | 1242 | char *t = NULL, *u = NULL; |
efdb0237 | 1243 | const char *e; |
35d2e7ec LP |
1244 | |
1245 | assert(spec); | |
35d2e7ec LP |
1246 | |
1247 | if (*spec == '/') { | |
e884315e LP |
1248 | if (!path_is_safe(spec)) |
1249 | return -EINVAL; | |
35d2e7ec LP |
1250 | |
1251 | if (path) { | |
246aa6dd LP |
1252 | t = strdup(spec); |
1253 | if (!t) | |
35d2e7ec LP |
1254 | return -ENOMEM; |
1255 | ||
dbb9401d | 1256 | *path = path_kill_slashes(t); |
8c6db833 LP |
1257 | } |
1258 | ||
35d2e7ec LP |
1259 | if (controller) |
1260 | *controller = NULL; | |
1261 | ||
1262 | return 0; | |
8c6db833 LP |
1263 | } |
1264 | ||
246aa6dd LP |
1265 | e = strchr(spec, ':'); |
1266 | if (!e) { | |
185a0874 | 1267 | if (!cg_controller_is_valid(spec)) |
35d2e7ec LP |
1268 | return -EINVAL; |
1269 | ||
1270 | if (controller) { | |
efdb0237 | 1271 | t = strdup(spec); |
246aa6dd | 1272 | if (!t) |
35d2e7ec LP |
1273 | return -ENOMEM; |
1274 | ||
1275 | *controller = t; | |
1276 | } | |
1277 | ||
1278 | if (path) | |
1279 | *path = NULL; | |
1280 | ||
1281 | return 0; | |
8c6db833 LP |
1282 | } |
1283 | ||
efdb0237 | 1284 | t = strndup(spec, e-spec); |
e884315e LP |
1285 | if (!t) |
1286 | return -ENOMEM; | |
185a0874 | 1287 | if (!cg_controller_is_valid(t)) { |
e884315e | 1288 | free(t); |
35d2e7ec | 1289 | return -EINVAL; |
246aa6dd LP |
1290 | } |
1291 | ||
efdb0237 LP |
1292 | if (isempty(e+1)) |
1293 | u = NULL; | |
1294 | else { | |
baa89da4 LP |
1295 | u = strdup(e+1); |
1296 | if (!u) { | |
1297 | free(t); | |
1298 | return -ENOMEM; | |
1299 | } | |
35d2e7ec | 1300 | |
baa89da4 LP |
1301 | if (!path_is_safe(u) || |
1302 | !path_is_absolute(u)) { | |
1303 | free(t); | |
1304 | free(u); | |
1305 | return -EINVAL; | |
1306 | } | |
1307 | ||
1308 | path_kill_slashes(u); | |
1309 | } | |
5954c074 | 1310 | |
35d2e7ec LP |
1311 | if (controller) |
1312 | *controller = t; | |
e884315e LP |
1313 | else |
1314 | free(t); | |
35d2e7ec LP |
1315 | |
1316 | if (path) | |
1317 | *path = u; | |
e884315e LP |
1318 | else |
1319 | free(u); | |
35d2e7ec LP |
1320 | |
1321 | return 0; | |
8c6db833 | 1322 | } |
c6c18be3 | 1323 | |
7027ff61 | 1324 | int cg_mangle_path(const char *path, char **result) { |
78edb35a LP |
1325 | _cleanup_free_ char *c = NULL, *p = NULL; |
1326 | char *t; | |
35d2e7ec LP |
1327 | int r; |
1328 | ||
1329 | assert(path); | |
1330 | assert(result); | |
1331 | ||
73e231ab | 1332 | /* First, check if it already is a filesystem path */ |
7027ff61 | 1333 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 1334 | |
b69d29ce LP |
1335 | t = strdup(path); |
1336 | if (!t) | |
35d2e7ec LP |
1337 | return -ENOMEM; |
1338 | ||
dbb9401d | 1339 | *result = path_kill_slashes(t); |
35d2e7ec LP |
1340 | return 0; |
1341 | } | |
1342 | ||
73e231ab | 1343 | /* Otherwise, treat it as cg spec */ |
b69d29ce LP |
1344 | r = cg_split_spec(path, &c, &p); |
1345 | if (r < 0) | |
35d2e7ec LP |
1346 | return r; |
1347 | ||
efdb0237 | 1348 | return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result); |
35d2e7ec | 1349 | } |
1f73f0f1 | 1350 | |
7027ff61 | 1351 | int cg_get_root_path(char **path) { |
9444b1f2 | 1352 | char *p, *e; |
7027ff61 LP |
1353 | int r; |
1354 | ||
1355 | assert(path); | |
1356 | ||
9444b1f2 | 1357 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1358 | if (r < 0) |
1359 | return r; | |
1360 | ||
efdb0237 LP |
1361 | e = endswith(p, "/" SPECIAL_INIT_SCOPE); |
1362 | if (!e) | |
1363 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */ | |
1364 | if (!e) | |
1365 | e = endswith(p, "/system"); /* even more legacy */ | |
9444b1f2 | 1366 | if (e) |
7027ff61 LP |
1367 | *e = 0; |
1368 | ||
1f73f0f1 LP |
1369 | *path = p; |
1370 | return 0; | |
1371 | } | |
b59e2465 | 1372 | |
751bc6ac LP |
1373 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
1374 | _cleanup_free_ char *rt = NULL; | |
1375 | char *p; | |
ba1261bc LP |
1376 | int r; |
1377 | ||
e9174f29 | 1378 | assert(cgroup); |
751bc6ac | 1379 | assert(shifted); |
e9174f29 LP |
1380 | |
1381 | if (!root) { | |
1382 | /* If the root was specified let's use that, otherwise | |
1383 | * let's determine it from PID 1 */ | |
1384 | ||
751bc6ac | 1385 | r = cg_get_root_path(&rt); |
e9174f29 LP |
1386 | if (r < 0) |
1387 | return r; | |
1388 | ||
751bc6ac | 1389 | root = rt; |
e9174f29 | 1390 | } |
ba1261bc | 1391 | |
751bc6ac | 1392 | p = path_startswith(cgroup, root); |
efdb0237 | 1393 | if (p && p > cgroup) |
751bc6ac LP |
1394 | *shifted = p - 1; |
1395 | else | |
1396 | *shifted = cgroup; | |
1397 | ||
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { | |
1402 | _cleanup_free_ char *raw = NULL; | |
1403 | const char *c; | |
1404 | int r; | |
1405 | ||
1406 | assert(pid >= 0); | |
1407 | assert(cgroup); | |
1408 | ||
1409 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
7027ff61 | 1410 | if (r < 0) |
ba1261bc | 1411 | return r; |
ba1261bc | 1412 | |
751bc6ac LP |
1413 | r = cg_shift_path(raw, root, &c); |
1414 | if (r < 0) | |
1415 | return r; | |
ba1261bc | 1416 | |
751bc6ac LP |
1417 | if (c == raw) { |
1418 | *cgroup = raw; | |
1419 | raw = NULL; | |
1420 | } else { | |
1421 | char *n; | |
ba1261bc | 1422 | |
751bc6ac LP |
1423 | n = strdup(c); |
1424 | if (!n) | |
ba1261bc | 1425 | return -ENOMEM; |
ba1261bc | 1426 | |
751bc6ac LP |
1427 | *cgroup = n; |
1428 | } | |
ba1261bc LP |
1429 | |
1430 | return 0; | |
1431 | } | |
1432 | ||
9ed794a3 | 1433 | int cg_path_decode_unit(const char *cgroup, char **unit) { |
8b0849e9 LP |
1434 | char *c, *s; |
1435 | size_t n; | |
ef1673d1 MT |
1436 | |
1437 | assert(cgroup); | |
6c03089c | 1438 | assert(unit); |
ef1673d1 | 1439 | |
8b0849e9 LP |
1440 | n = strcspn(cgroup, "/"); |
1441 | if (n < 3) | |
1442 | return -ENXIO; | |
1443 | ||
1444 | c = strndupa(cgroup, n); | |
ae018d9b | 1445 | c = cg_unescape(c); |
ef1673d1 | 1446 | |
7410616c | 1447 | if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) |
cfeaa44a | 1448 | return -ENXIO; |
ef1673d1 | 1449 | |
d7bd3de0 | 1450 | s = strdup(c); |
6c03089c LP |
1451 | if (!s) |
1452 | return -ENOMEM; | |
1453 | ||
1454 | *unit = s; | |
ef1673d1 MT |
1455 | return 0; |
1456 | } | |
1457 | ||
8b0849e9 LP |
1458 | static bool valid_slice_name(const char *p, size_t n) { |
1459 | ||
1460 | if (!p) | |
1461 | return false; | |
1462 | ||
1463 | if (n < strlen("x.slice")) | |
1464 | return false; | |
1465 | ||
1466 | if (memcmp(p + n - 6, ".slice", 6) == 0) { | |
1467 | char buf[n+1], *c; | |
1468 | ||
1469 | memcpy(buf, p, n); | |
1470 | buf[n] = 0; | |
1471 | ||
1472 | c = cg_unescape(buf); | |
1473 | ||
7410616c | 1474 | return unit_name_is_valid(c, UNIT_NAME_PLAIN); |
8b0849e9 LP |
1475 | } |
1476 | ||
1477 | return false; | |
1478 | } | |
1479 | ||
9444b1f2 | 1480 | static const char *skip_slices(const char *p) { |
8b0849e9 LP |
1481 | assert(p); |
1482 | ||
9444b1f2 LP |
1483 | /* Skips over all slice assignments */ |
1484 | ||
1485 | for (;;) { | |
1021b21b LP |
1486 | size_t n; |
1487 | ||
9444b1f2 LP |
1488 | p += strspn(p, "/"); |
1489 | ||
1490 | n = strcspn(p, "/"); | |
8b0849e9 | 1491 | if (!valid_slice_name(p, n)) |
9444b1f2 LP |
1492 | return p; |
1493 | ||
1494 | p += n; | |
1495 | } | |
1496 | } | |
1497 | ||
8b0849e9 | 1498 | int cg_path_get_unit(const char *path, char **ret) { |
6c03089c | 1499 | const char *e; |
8b0849e9 LP |
1500 | char *unit; |
1501 | int r; | |
6c03089c LP |
1502 | |
1503 | assert(path); | |
8b0849e9 | 1504 | assert(ret); |
6c03089c | 1505 | |
9444b1f2 | 1506 | e = skip_slices(path); |
6c03089c | 1507 | |
8b0849e9 LP |
1508 | r = cg_path_decode_unit(e, &unit); |
1509 | if (r < 0) | |
1510 | return r; | |
1511 | ||
1512 | /* We skipped over the slices, don't accept any now */ | |
1513 | if (endswith(unit, ".slice")) { | |
1514 | free(unit); | |
1515 | return -ENXIO; | |
1516 | } | |
1517 | ||
1518 | *ret = unit; | |
1519 | return 0; | |
6c03089c LP |
1520 | } |
1521 | ||
1522 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
7fd1b19b | 1523 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1524 | int r; |
ba1261bc | 1525 | |
ef1673d1 MT |
1526 | assert(unit); |
1527 | ||
7027ff61 | 1528 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1529 | if (r < 0) |
1530 | return r; | |
1531 | ||
6c03089c LP |
1532 | return cg_path_get_unit(cgroup, unit); |
1533 | } | |
ef1673d1 | 1534 | |
d4fffc4b ZJS |
1535 | /** |
1536 | * Skip session-*.scope, but require it to be there. | |
1537 | */ | |
9444b1f2 LP |
1538 | static const char *skip_session(const char *p) { |
1539 | size_t n; | |
1540 | ||
8b0849e9 LP |
1541 | if (isempty(p)) |
1542 | return NULL; | |
9444b1f2 LP |
1543 | |
1544 | p += strspn(p, "/"); | |
1545 | ||
1546 | n = strcspn(p, "/"); | |
8b0849e9 | 1547 | if (n < strlen("session-x.scope")) |
d4fffc4b ZJS |
1548 | return NULL; |
1549 | ||
8b0849e9 LP |
1550 | if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { |
1551 | char buf[n - 8 - 6 + 1]; | |
1552 | ||
1553 | memcpy(buf, p + 8, n - 8 - 6); | |
1554 | buf[n - 8 - 6] = 0; | |
d4fffc4b | 1555 | |
8b0849e9 LP |
1556 | /* Note that session scopes never need unescaping, |
1557 | * since they cannot conflict with the kernel's own | |
1558 | * names, hence we don't need to call cg_unescape() | |
1559 | * here. */ | |
1560 | ||
1561 | if (!session_id_valid(buf)) | |
1562 | return false; | |
1563 | ||
1564 | p += n; | |
1565 | p += strspn(p, "/"); | |
1566 | return p; | |
1567 | } | |
1568 | ||
1569 | return NULL; | |
d4fffc4b ZJS |
1570 | } |
1571 | ||
1572 | /** | |
1573 | * Skip user@*.service, but require it to be there. | |
1574 | */ | |
1575 | static const char *skip_user_manager(const char *p) { | |
1576 | size_t n; | |
1577 | ||
8b0849e9 LP |
1578 | if (isempty(p)) |
1579 | return NULL; | |
d4fffc4b ZJS |
1580 | |
1581 | p += strspn(p, "/"); | |
1582 | ||
1583 | n = strcspn(p, "/"); | |
8b0849e9 | 1584 | if (n < strlen("user@x.service")) |
6c03089c | 1585 | return NULL; |
ef1673d1 | 1586 | |
8b0849e9 LP |
1587 | if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { |
1588 | char buf[n - 5 - 8 + 1]; | |
9444b1f2 | 1589 | |
8b0849e9 LP |
1590 | memcpy(buf, p + 5, n - 5 - 8); |
1591 | buf[n - 5 - 8] = 0; | |
1592 | ||
1593 | /* Note that user manager services never need unescaping, | |
1594 | * since they cannot conflict with the kernel's own | |
1595 | * names, hence we don't need to call cg_unescape() | |
1596 | * here. */ | |
1597 | ||
1598 | if (parse_uid(buf, NULL) < 0) | |
1599 | return NULL; | |
1600 | ||
1601 | p += n; | |
1602 | p += strspn(p, "/"); | |
1603 | ||
1604 | return p; | |
1605 | } | |
1606 | ||
1607 | return NULL; | |
9444b1f2 LP |
1608 | } |
1609 | ||
329ac4bc | 1610 | static const char *skip_user_prefix(const char *path) { |
d4fffc4b | 1611 | const char *e, *t; |
ef1673d1 | 1612 | |
6c03089c | 1613 | assert(path); |
ba1261bc | 1614 | |
9444b1f2 LP |
1615 | /* Skip slices, if there are any */ |
1616 | e = skip_slices(path); | |
ba1261bc | 1617 | |
329ac4bc | 1618 | /* Skip the user manager, if it's in the path now... */ |
8b0849e9 | 1619 | t = skip_user_manager(e); |
329ac4bc LP |
1620 | if (t) |
1621 | return t; | |
8b0849e9 | 1622 | |
329ac4bc LP |
1623 | /* Alternatively skip the user session if it is in the path... */ |
1624 | return skip_session(e); | |
1625 | } | |
32081481 | 1626 | |
329ac4bc LP |
1627 | int cg_path_get_user_unit(const char *path, char **ret) { |
1628 | const char *t; | |
6c03089c | 1629 | |
329ac4bc LP |
1630 | assert(path); |
1631 | assert(ret); | |
8b0849e9 | 1632 | |
329ac4bc LP |
1633 | t = skip_user_prefix(path); |
1634 | if (!t) | |
8b0849e9 | 1635 | return -ENXIO; |
8b0849e9 | 1636 | |
329ac4bc LP |
1637 | /* And from here on it looks pretty much the same as for a |
1638 | * system unit, hence let's use the same parser from here | |
1639 | * on. */ | |
1640 | return cg_path_get_unit(t, ret); | |
ef1673d1 | 1641 | } |
ba1261bc | 1642 | |
ef1673d1 | 1643 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
7fd1b19b | 1644 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1645 | int r; |
1646 | ||
1647 | assert(unit); | |
1648 | ||
7027ff61 | 1649 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1650 | if (r < 0) |
1651 | return r; | |
1652 | ||
1653 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1654 | } |
e884315e | 1655 | |
7027ff61 | 1656 | int cg_path_get_machine_name(const char *path, char **machine) { |
efdb0237 LP |
1657 | _cleanup_free_ char *u = NULL; |
1658 | const char *sl; | |
89f7c846 | 1659 | int r; |
374ec6ab | 1660 | |
89f7c846 LP |
1661 | r = cg_path_get_unit(path, &u); |
1662 | if (r < 0) | |
1663 | return r; | |
7027ff61 | 1664 | |
efdb0237 | 1665 | sl = strjoina("/run/systemd/machines/unit:", u); |
89f7c846 | 1666 | return readlink_malloc(sl, machine); |
7027ff61 LP |
1667 | } |
1668 | ||
1669 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
7fd1b19b | 1670 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1671 | int r; |
1672 | ||
1673 | assert(machine); | |
1674 | ||
1675 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1676 | if (r < 0) | |
1677 | return r; | |
1678 | ||
1679 | return cg_path_get_machine_name(cgroup, machine); | |
1680 | } | |
1681 | ||
1682 | int cg_path_get_session(const char *path, char **session) { | |
8b0849e9 LP |
1683 | _cleanup_free_ char *unit = NULL; |
1684 | char *start, *end; | |
1685 | int r; | |
7027ff61 LP |
1686 | |
1687 | assert(path); | |
7027ff61 | 1688 | |
8b0849e9 LP |
1689 | r = cg_path_get_unit(path, &unit); |
1690 | if (r < 0) | |
1691 | return r; | |
7027ff61 | 1692 | |
8b0849e9 LP |
1693 | start = startswith(unit, "session-"); |
1694 | if (!start) | |
cfeaa44a | 1695 | return -ENXIO; |
8b0849e9 LP |
1696 | end = endswith(start, ".scope"); |
1697 | if (!end) | |
cfeaa44a | 1698 | return -ENXIO; |
8b0849e9 LP |
1699 | |
1700 | *end = 0; | |
1701 | if (!session_id_valid(start)) | |
cfeaa44a | 1702 | return -ENXIO; |
374ec6ab | 1703 | |
af08d2f9 | 1704 | if (session) { |
8b0849e9 | 1705 | char *rr; |
af08d2f9 | 1706 | |
8b0849e9 LP |
1707 | rr = strdup(start); |
1708 | if (!rr) | |
af08d2f9 LP |
1709 | return -ENOMEM; |
1710 | ||
8b0849e9 | 1711 | *session = rr; |
af08d2f9 | 1712 | } |
7027ff61 | 1713 | |
7027ff61 LP |
1714 | return 0; |
1715 | } | |
1716 | ||
1717 | int cg_pid_get_session(pid_t pid, char **session) { | |
7fd1b19b | 1718 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1719 | int r; |
1720 | ||
7027ff61 LP |
1721 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1722 | if (r < 0) | |
1723 | return r; | |
1724 | ||
1725 | return cg_path_get_session(cgroup, session); | |
1726 | } | |
1727 | ||
ae018d9b | 1728 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
374ec6ab | 1729 | _cleanup_free_ char *slice = NULL; |
8b0849e9 | 1730 | char *start, *end; |
374ec6ab | 1731 | int r; |
ae018d9b LP |
1732 | |
1733 | assert(path); | |
ae018d9b | 1734 | |
374ec6ab LP |
1735 | r = cg_path_get_slice(path, &slice); |
1736 | if (r < 0) | |
1737 | return r; | |
ae018d9b | 1738 | |
674eb685 LP |
1739 | start = startswith(slice, "user-"); |
1740 | if (!start) | |
cfeaa44a | 1741 | return -ENXIO; |
8b0849e9 | 1742 | end = endswith(start, ".slice"); |
674eb685 | 1743 | if (!end) |
cfeaa44a | 1744 | return -ENXIO; |
ae018d9b | 1745 | |
8b0849e9 LP |
1746 | *end = 0; |
1747 | if (parse_uid(start, uid) < 0) | |
cfeaa44a | 1748 | return -ENXIO; |
674eb685 | 1749 | |
674eb685 | 1750 | return 0; |
ae018d9b LP |
1751 | } |
1752 | ||
1753 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1754 | _cleanup_free_ char *cgroup = NULL; | |
1755 | int r; | |
1756 | ||
ae018d9b LP |
1757 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1758 | if (r < 0) | |
1759 | return r; | |
1760 | ||
1761 | return cg_path_get_owner_uid(cgroup, uid); | |
1762 | } | |
1763 | ||
1021b21b LP |
1764 | int cg_path_get_slice(const char *p, char **slice) { |
1765 | const char *e = NULL; | |
1021b21b LP |
1766 | |
1767 | assert(p); | |
1768 | assert(slice); | |
1769 | ||
329ac4bc LP |
1770 | /* Finds the right-most slice unit from the beginning, but |
1771 | * stops before we come to the first non-slice unit. */ | |
1772 | ||
1021b21b LP |
1773 | for (;;) { |
1774 | size_t n; | |
1775 | ||
1776 | p += strspn(p, "/"); | |
1777 | ||
1778 | n = strcspn(p, "/"); | |
8b0849e9 | 1779 | if (!valid_slice_name(p, n)) { |
1021b21b | 1780 | |
8b0849e9 LP |
1781 | if (!e) { |
1782 | char *s; | |
1021b21b | 1783 | |
e5d855d3 | 1784 | s = strdup(SPECIAL_ROOT_SLICE); |
8b0849e9 LP |
1785 | if (!s) |
1786 | return -ENOMEM; | |
1021b21b | 1787 | |
8b0849e9 LP |
1788 | *slice = s; |
1789 | return 0; | |
1790 | } | |
1791 | ||
1792 | return cg_path_decode_unit(e, slice); | |
1021b21b LP |
1793 | } |
1794 | ||
1795 | e = p; | |
1021b21b LP |
1796 | p += n; |
1797 | } | |
1798 | } | |
1799 | ||
1800 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1801 | _cleanup_free_ char *cgroup = NULL; | |
1802 | int r; | |
1803 | ||
1804 | assert(slice); | |
1805 | ||
1806 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1807 | if (r < 0) | |
1808 | return r; | |
1809 | ||
1810 | return cg_path_get_slice(cgroup, slice); | |
1811 | } | |
1812 | ||
329ac4bc LP |
1813 | int cg_path_get_user_slice(const char *p, char **slice) { |
1814 | const char *t; | |
1815 | assert(p); | |
1816 | assert(slice); | |
1817 | ||
1818 | t = skip_user_prefix(p); | |
1819 | if (!t) | |
1820 | return -ENXIO; | |
1821 | ||
1822 | /* And now it looks pretty much the same as for a system | |
1823 | * slice, so let's just use the same parser from here on. */ | |
1824 | return cg_path_get_slice(t, slice); | |
1825 | } | |
1826 | ||
1827 | int cg_pid_get_user_slice(pid_t pid, char **slice) { | |
1828 | _cleanup_free_ char *cgroup = NULL; | |
1829 | int r; | |
1830 | ||
1831 | assert(slice); | |
1832 | ||
1833 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1834 | if (r < 0) | |
1835 | return r; | |
1836 | ||
1837 | return cg_path_get_user_slice(cgroup, slice); | |
1838 | } | |
1839 | ||
ae018d9b LP |
1840 | char *cg_escape(const char *p) { |
1841 | bool need_prefix = false; | |
1842 | ||
1843 | /* This implements very minimal escaping for names to be used | |
1844 | * as file names in the cgroup tree: any name which might | |
1845 | * conflict with a kernel name or is prefixed with '_' is | |
1846 | * prefixed with a '_'. That way, when reading cgroup names it | |
1847 | * is sufficient to remove a single prefixing underscore if | |
1848 | * there is one. */ | |
1849 | ||
1850 | /* The return value of this function (unlike cg_unescape()) | |
1851 | * needs free()! */ | |
1852 | ||
a0ab5665 LP |
1853 | if (p[0] == 0 || |
1854 | p[0] == '_' || | |
1855 | p[0] == '.' || | |
1856 | streq(p, "notify_on_release") || | |
1857 | streq(p, "release_agent") || | |
efdb0237 LP |
1858 | streq(p, "tasks") || |
1859 | startswith(p, "cgroup.")) | |
ae018d9b LP |
1860 | need_prefix = true; |
1861 | else { | |
1862 | const char *dot; | |
1863 | ||
1864 | dot = strrchr(p, '.'); | |
1865 | if (dot) { | |
efdb0237 LP |
1866 | CGroupController c; |
1867 | size_t l = dot - p; | |
ae018d9b | 1868 | |
efdb0237 LP |
1869 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
1870 | const char *n; | |
1871 | ||
1872 | n = cgroup_controller_to_string(c); | |
ae018d9b | 1873 | |
efdb0237 LP |
1874 | if (l != strlen(n)) |
1875 | continue; | |
ae018d9b | 1876 | |
efdb0237 LP |
1877 | if (memcmp(p, n, l) != 0) |
1878 | continue; | |
1879 | ||
1880 | need_prefix = true; | |
1881 | break; | |
ae018d9b LP |
1882 | } |
1883 | } | |
1884 | } | |
1885 | ||
1886 | if (need_prefix) | |
1887 | return strappend("_", p); | |
efdb0237 LP |
1888 | |
1889 | return strdup(p); | |
ae018d9b LP |
1890 | } |
1891 | ||
1892 | char *cg_unescape(const char *p) { | |
1893 | assert(p); | |
1894 | ||
1895 | /* The return value of this function (unlike cg_escape()) | |
1896 | * doesn't need free()! */ | |
1897 | ||
1898 | if (p[0] == '_') | |
1899 | return (char*) p+1; | |
1900 | ||
1901 | return (char*) p; | |
1902 | } | |
78edb35a LP |
1903 | |
1904 | #define CONTROLLER_VALID \ | |
4b549144 | 1905 | DIGITS LETTERS \ |
78edb35a LP |
1906 | "_" |
1907 | ||
185a0874 | 1908 | bool cg_controller_is_valid(const char *p) { |
78edb35a LP |
1909 | const char *t, *s; |
1910 | ||
1911 | if (!p) | |
1912 | return false; | |
1913 | ||
b6629c4b TH |
1914 | if (streq(p, SYSTEMD_CGROUP_CONTROLLER)) |
1915 | return true; | |
1916 | ||
185a0874 DJL |
1917 | s = startswith(p, "name="); |
1918 | if (s) | |
1919 | p = s; | |
78edb35a LP |
1920 | |
1921 | if (*p == 0 || *p == '_') | |
1922 | return false; | |
1923 | ||
1924 | for (t = p; *t; t++) | |
1925 | if (!strchr(CONTROLLER_VALID, *t)) | |
1926 | return false; | |
1927 | ||
1928 | if (t - p > FILENAME_MAX) | |
1929 | return false; | |
1930 | ||
1931 | return true; | |
1932 | } | |
a016b922 LP |
1933 | |
1934 | int cg_slice_to_path(const char *unit, char **ret) { | |
1935 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1936 | const char *dash; | |
7410616c | 1937 | int r; |
a016b922 LP |
1938 | |
1939 | assert(unit); | |
1940 | assert(ret); | |
1941 | ||
e5d855d3 | 1942 | if (streq(unit, SPECIAL_ROOT_SLICE)) { |
c96cc582 LP |
1943 | char *x; |
1944 | ||
1945 | x = strdup(""); | |
1946 | if (!x) | |
1947 | return -ENOMEM; | |
1948 | *ret = x; | |
1949 | return 0; | |
1950 | } | |
1951 | ||
7410616c | 1952 | if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) |
a016b922 LP |
1953 | return -EINVAL; |
1954 | ||
1955 | if (!endswith(unit, ".slice")) | |
1956 | return -EINVAL; | |
1957 | ||
7410616c LP |
1958 | r = unit_name_to_prefix(unit, &p); |
1959 | if (r < 0) | |
1960 | return r; | |
a016b922 LP |
1961 | |
1962 | dash = strchr(p, '-'); | |
e66e5b61 LP |
1963 | |
1964 | /* Don't allow initial dashes */ | |
1965 | if (dash == p) | |
1966 | return -EINVAL; | |
1967 | ||
a016b922 LP |
1968 | while (dash) { |
1969 | _cleanup_free_ char *escaped = NULL; | |
1970 | char n[dash - p + sizeof(".slice")]; | |
1971 | ||
e66e5b61 LP |
1972 | /* Don't allow trailing or double dashes */ |
1973 | if (dash[1] == 0 || dash[1] == '-') | |
c96cc582 | 1974 | return -EINVAL; |
a016b922 | 1975 | |
c96cc582 | 1976 | strcpy(stpncpy(n, p, dash - p), ".slice"); |
7410616c | 1977 | if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) |
a016b922 LP |
1978 | return -EINVAL; |
1979 | ||
1980 | escaped = cg_escape(n); | |
1981 | if (!escaped) | |
1982 | return -ENOMEM; | |
1983 | ||
1984 | if (!strextend(&s, escaped, "/", NULL)) | |
1985 | return -ENOMEM; | |
1986 | ||
1987 | dash = strchr(dash+1, '-'); | |
1988 | } | |
1989 | ||
1990 | e = cg_escape(unit); | |
1991 | if (!e) | |
1992 | return -ENOMEM; | |
1993 | ||
1994 | if (!strextend(&s, e, NULL)) | |
1995 | return -ENOMEM; | |
1996 | ||
1997 | *ret = s; | |
1998 | s = NULL; | |
1999 | ||
2000 | return 0; | |
2001 | } | |
4ad49000 LP |
2002 | |
2003 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
2004 | _cleanup_free_ char *p = NULL; | |
2005 | int r; | |
2006 | ||
2007 | r = cg_get_path(controller, path, attribute, &p); | |
2008 | if (r < 0) | |
2009 | return r; | |
2010 | ||
4c1fc3e4 | 2011 | return write_string_file(p, value, 0); |
4ad49000 LP |
2012 | } |
2013 | ||
934277fe LP |
2014 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
2015 | _cleanup_free_ char *p = NULL; | |
2016 | int r; | |
2017 | ||
2018 | r = cg_get_path(controller, path, attribute, &p); | |
2019 | if (r < 0) | |
2020 | return r; | |
2021 | ||
2022 | return read_one_line_file(p, ret); | |
2023 | } | |
2024 | ||
66ebf6c0 TH |
2025 | int cg_get_keyed_attribute(const char *controller, const char *path, const char *attribute, const char **keys, char **values) { |
2026 | _cleanup_free_ char *filename = NULL, *content = NULL; | |
2027 | char *line, *p; | |
2028 | int i, r; | |
2029 | ||
2030 | for (i = 0; keys[i]; i++) | |
2031 | values[i] = NULL; | |
2032 | ||
2033 | r = cg_get_path(controller, path, attribute, &filename); | |
2034 | if (r < 0) | |
2035 | return r; | |
2036 | ||
2037 | r = read_full_file(filename, &content, NULL); | |
2038 | if (r < 0) | |
2039 | return r; | |
2040 | ||
2041 | p = content; | |
2042 | while ((line = strsep(&p, "\n"))) { | |
2043 | char *key; | |
2044 | ||
2045 | key = strsep(&line, " "); | |
2046 | ||
2047 | for (i = 0; keys[i]; i++) { | |
2048 | if (streq(key, keys[i])) { | |
2049 | values[i] = strdup(line); | |
2050 | break; | |
2051 | } | |
2052 | } | |
2053 | } | |
2054 | ||
2055 | for (i = 0; keys[i]; i++) { | |
2056 | if (!values[i]) { | |
2057 | for (i = 0; keys[i]; i++) { | |
2058 | free(values[i]); | |
2059 | values[i] = NULL; | |
2060 | } | |
2061 | return -ENOENT; | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | return 0; | |
2066 | } | |
2067 | ||
efdb0237 LP |
2068 | int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) { |
2069 | CGroupController c; | |
415fc41c | 2070 | int r; |
4ad49000 LP |
2071 | |
2072 | /* This one will create a cgroup in our private tree, but also | |
2073 | * duplicate it in the trees specified in mask, and remove it | |
2074 | * in all others */ | |
2075 | ||
2076 | /* First create the cgroup in our own hierarchy. */ | |
2077 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
2078 | if (r < 0) | |
2079 | return r; | |
2080 | ||
efdb0237 | 2081 | /* If we are in the unified hierarchy, we are done now */ |
b4cccbc1 LP |
2082 | r = cg_all_unified(); |
2083 | if (r < 0) | |
2084 | return r; | |
2085 | if (r > 0) | |
efdb0237 LP |
2086 | return 0; |
2087 | ||
2088 | /* Otherwise, do the same in the other hierarchies */ | |
2089 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2090 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2091 | const char *n; | |
2092 | ||
2093 | n = cgroup_controller_to_string(c); | |
2094 | ||
13b84ec7 | 2095 | if (mask & bit) |
efdb0237 | 2096 | (void) cg_create(n, path); |
13b84ec7 | 2097 | else if (supported & bit) |
efdb0237 | 2098 | (void) cg_trim(n, path, true); |
4ad49000 LP |
2099 | } |
2100 | ||
13b84ec7 | 2101 | return 0; |
4ad49000 LP |
2102 | } |
2103 | ||
efdb0237 LP |
2104 | int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { |
2105 | CGroupController c; | |
415fc41c | 2106 | int r; |
4ad49000 LP |
2107 | |
2108 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
13b84ec7 LP |
2109 | if (r < 0) |
2110 | return r; | |
4ad49000 | 2111 | |
b4cccbc1 LP |
2112 | r = cg_all_unified(); |
2113 | if (r < 0) | |
2114 | return r; | |
2115 | if (r > 0) | |
efdb0237 | 2116 | return 0; |
7b3fd631 | 2117 | |
efdb0237 LP |
2118 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
2119 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2120 | const char *p = NULL; | |
7b3fd631 | 2121 | |
efdb0237 LP |
2122 | if (!(supported & bit)) |
2123 | continue; | |
7b3fd631 | 2124 | |
efdb0237 LP |
2125 | if (path_callback) |
2126 | p = path_callback(bit, userdata); | |
7b3fd631 | 2127 | |
efdb0237 LP |
2128 | if (!p) |
2129 | p = path; | |
4ad49000 | 2130 | |
efdb0237 | 2131 | (void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid); |
4ad49000 LP |
2132 | } |
2133 | ||
13b84ec7 | 2134 | return 0; |
4ad49000 LP |
2135 | } |
2136 | ||
efdb0237 | 2137 | int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { |
6c12b52e LP |
2138 | Iterator i; |
2139 | void *pidp; | |
2140 | int r = 0; | |
2141 | ||
2142 | SET_FOREACH(pidp, pids, i) { | |
fea72cc0 | 2143 | pid_t pid = PTR_TO_PID(pidp); |
13b84ec7 | 2144 | int q; |
6c12b52e | 2145 | |
7b3fd631 | 2146 | q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); |
efdb0237 | 2147 | if (q < 0 && r >= 0) |
13b84ec7 | 2148 | r = q; |
6c12b52e LP |
2149 | } |
2150 | ||
2151 | return r; | |
2152 | } | |
2153 | ||
efdb0237 | 2154 | int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
b3c5bad3 | 2155 | CGroupController c; |
b4cccbc1 | 2156 | int r = 0, q; |
4ad49000 | 2157 | |
13b84ec7 | 2158 | if (!path_equal(from, to)) { |
1d98fef1 | 2159 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE); |
13b84ec7 LP |
2160 | if (r < 0) |
2161 | return r; | |
2162 | } | |
4ad49000 | 2163 | |
b4cccbc1 LP |
2164 | q = cg_all_unified(); |
2165 | if (q < 0) | |
2166 | return q; | |
2167 | if (q > 0) | |
efdb0237 | 2168 | return r; |
03b90d4b | 2169 | |
efdb0237 LP |
2170 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
2171 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2172 | const char *p = NULL; | |
03b90d4b | 2173 | |
efdb0237 LP |
2174 | if (!(supported & bit)) |
2175 | continue; | |
03b90d4b | 2176 | |
efdb0237 LP |
2177 | if (to_callback) |
2178 | p = to_callback(bit, userdata); | |
4ad49000 | 2179 | |
efdb0237 LP |
2180 | if (!p) |
2181 | p = to; | |
2182 | ||
1d98fef1 | 2183 | (void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, 0); |
4ad49000 LP |
2184 | } |
2185 | ||
13b84ec7 | 2186 | return 0; |
4ad49000 LP |
2187 | } |
2188 | ||
efdb0237 LP |
2189 | int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) { |
2190 | CGroupController c; | |
b4cccbc1 | 2191 | int r, q; |
4ad49000 LP |
2192 | |
2193 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
2194 | if (r < 0) | |
2195 | return r; | |
2196 | ||
b4cccbc1 LP |
2197 | q = cg_all_unified(); |
2198 | if (q < 0) | |
2199 | return q; | |
2200 | if (q > 0) | |
efdb0237 LP |
2201 | return r; |
2202 | ||
2203 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2204 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2205 | ||
2206 | if (!(supported & bit)) | |
2207 | continue; | |
4ad49000 | 2208 | |
efdb0237 | 2209 | (void) cg_trim(cgroup_controller_to_string(c), path, delete_root); |
4ad49000 LP |
2210 | } |
2211 | ||
13b84ec7 | 2212 | return 0; |
4ad49000 LP |
2213 | } |
2214 | ||
aae7e17f FB |
2215 | int cg_mask_to_string(CGroupMask mask, char **ret) { |
2216 | const char *controllers[_CGROUP_CONTROLLER_MAX + 1]; | |
2217 | CGroupController c; | |
2218 | int i = 0; | |
2219 | char *s; | |
2220 | ||
2221 | assert(ret); | |
2222 | ||
2223 | if (mask == 0) { | |
2224 | *ret = NULL; | |
2225 | return 0; | |
2226 | } | |
2227 | ||
2228 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2229 | ||
2230 | if (!(mask & CGROUP_CONTROLLER_TO_MASK(c))) | |
2231 | continue; | |
2232 | ||
2233 | controllers[i++] = cgroup_controller_to_string(c); | |
2234 | controllers[i] = NULL; | |
2235 | } | |
2236 | ||
2237 | s = strv_join((char **)controllers, NULL); | |
2238 | if (!s) | |
2239 | return -ENOMEM; | |
2240 | ||
2241 | *ret = s; | |
2242 | return 0; | |
2243 | } | |
2244 | ||
2245 | int cg_mask_from_string(const char *value, CGroupMask *mask) { | |
2246 | assert(mask); | |
2247 | assert(value); | |
2248 | ||
2249 | for (;;) { | |
2250 | _cleanup_free_ char *n = NULL; | |
2251 | CGroupController v; | |
2252 | int r; | |
2253 | ||
2254 | r = extract_first_word(&value, &n, NULL, 0); | |
2255 | if (r < 0) | |
2256 | return r; | |
2257 | if (r == 0) | |
2258 | break; | |
2259 | ||
2260 | v = cgroup_controller_from_string(n); | |
2261 | if (v < 0) | |
2262 | continue; | |
2263 | ||
2264 | *mask |= CGROUP_CONTROLLER_TO_MASK(v); | |
2265 | } | |
2266 | return 0; | |
2267 | } | |
2268 | ||
efdb0237 LP |
2269 | int cg_mask_supported(CGroupMask *ret) { |
2270 | CGroupMask mask = 0; | |
415fc41c | 2271 | int r; |
efdb0237 LP |
2272 | |
2273 | /* Determines the mask of supported cgroup controllers. Only | |
2274 | * includes controllers we can make sense of and that are | |
2275 | * actually accessible. */ | |
4ad49000 | 2276 | |
b4cccbc1 LP |
2277 | r = cg_all_unified(); |
2278 | if (r < 0) | |
2279 | return r; | |
2280 | if (r > 0) { | |
5f4c5fef | 2281 | _cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL; |
efdb0237 LP |
2282 | |
2283 | /* In the unified hierarchy we can read the supported | |
2284 | * and accessible controllers from a the top-level | |
2285 | * cgroup attribute */ | |
2286 | ||
5f4c5fef LP |
2287 | r = cg_get_root_path(&root); |
2288 | if (r < 0) | |
2289 | return r; | |
2290 | ||
2291 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path); | |
2292 | if (r < 0) | |
2293 | return r; | |
2294 | ||
2295 | r = read_one_line_file(path, &controllers); | |
efdb0237 LP |
2296 | if (r < 0) |
2297 | return r; | |
4ad49000 | 2298 | |
aae7e17f FB |
2299 | r = cg_mask_from_string(controllers, &mask); |
2300 | if (r < 0) | |
2301 | return r; | |
efdb0237 | 2302 | |
66ebf6c0 | 2303 | /* Currently, we support the cpu, memory, io and pids |
03a7b521 LP |
2304 | * controller in the unified hierarchy, mask |
2305 | * everything else off. */ | |
66ebf6c0 | 2306 | mask &= CGROUP_MASK_CPU | CGROUP_MASK_MEMORY | CGROUP_MASK_IO | CGROUP_MASK_PIDS; |
efdb0237 LP |
2307 | |
2308 | } else { | |
2309 | CGroupController c; | |
2310 | ||
2311 | /* In the legacy hierarchy, we check whether which | |
2312 | * hierarchies are mounted. */ | |
2313 | ||
2314 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2315 | const char *n; | |
2316 | ||
2317 | n = cgroup_controller_to_string(c); | |
2318 | if (controller_is_accessible(n) >= 0) | |
2319 | mask |= CGROUP_CONTROLLER_TO_MASK(c); | |
2320 | } | |
4ad49000 LP |
2321 | } |
2322 | ||
efdb0237 LP |
2323 | *ret = mask; |
2324 | return 0; | |
4ad49000 | 2325 | } |
b12afc8c LP |
2326 | |
2327 | int cg_kernel_controllers(Set *controllers) { | |
2328 | _cleanup_fclose_ FILE *f = NULL; | |
b12afc8c LP |
2329 | int r; |
2330 | ||
2331 | assert(controllers); | |
2332 | ||
e155a0aa LP |
2333 | /* Determines the full list of kernel-known controllers. Might |
2334 | * include controllers we don't actually support, arbitrary | |
2335 | * named hierarchies and controllers that aren't currently | |
2336 | * accessible (because not mounted). */ | |
2337 | ||
b12afc8c LP |
2338 | f = fopen("/proc/cgroups", "re"); |
2339 | if (!f) { | |
2340 | if (errno == ENOENT) | |
2341 | return 0; | |
2342 | return -errno; | |
2343 | } | |
2344 | ||
2345 | /* Ignore the header line */ | |
2351e44d | 2346 | (void) read_line(f, (size_t) -1, NULL); |
b12afc8c LP |
2347 | |
2348 | for (;;) { | |
2349 | char *controller; | |
2350 | int enabled = 0; | |
2351 | ||
2352 | errno = 0; | |
2353 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { | |
2354 | ||
2355 | if (feof(f)) | |
2356 | break; | |
2357 | ||
b3267152 | 2358 | if (ferror(f) && errno > 0) |
b12afc8c LP |
2359 | return -errno; |
2360 | ||
2361 | return -EBADMSG; | |
2362 | } | |
2363 | ||
2364 | if (!enabled) { | |
2365 | free(controller); | |
2366 | continue; | |
2367 | } | |
2368 | ||
efdb0237 | 2369 | if (!cg_controller_is_valid(controller)) { |
b12afc8c LP |
2370 | free(controller); |
2371 | return -EBADMSG; | |
2372 | } | |
2373 | ||
2374 | r = set_consume(controllers, controller); | |
2375 | if (r < 0) | |
2376 | return r; | |
2377 | } | |
2378 | ||
2379 | return 0; | |
2380 | } | |
efdb0237 | 2381 | |
5da38d07 TH |
2382 | static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN; |
2383 | ||
c22800e4 LP |
2384 | /* The hybrid mode was initially implemented in v232 and simply mounted cgroup v2 on /sys/fs/cgroup/systemd. This |
2385 | * unfortunately broke other tools (such as docker) which expected the v1 "name=systemd" hierarchy on | |
2386 | * /sys/fs/cgroup/systemd. From v233 and on, the hybrid mode mountnbs v2 on /sys/fs/cgroup/unified and maintains | |
2387 | * "name=systemd" hierarchy on /sys/fs/cgroup/systemd for compatibility with other tools. | |
f08e9287 | 2388 | * |
c22800e4 LP |
2389 | * To keep live upgrade working, we detect and support v232 layout. When v232 layout is detected, to keep cgroup v2 |
2390 | * process management but disable the compat dual layout, we return %true on | |
2391 | * cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) and %false on cg_hybrid_unified(). | |
f08e9287 TH |
2392 | */ |
2393 | static thread_local bool unified_systemd_v232; | |
2394 | ||
1fcca10e | 2395 | static int cg_unified_update(void) { |
efdb0237 | 2396 | |
efdb0237 LP |
2397 | struct statfs fs; |
2398 | ||
2399 | /* Checks if we support the unified hierarchy. Returns an | |
2400 | * error when the cgroup hierarchies aren't mounted yet or we | |
2401 | * have any other trouble determining if the unified hierarchy | |
2402 | * is supported. */ | |
2403 | ||
5da38d07 TH |
2404 | if (unified_cache >= CGROUP_UNIFIED_NONE) |
2405 | return 0; | |
efdb0237 LP |
2406 | |
2407 | if (statfs("/sys/fs/cgroup/", &fs) < 0) | |
2408 | return -errno; | |
2409 | ||
09961995 | 2410 | if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) |
5da38d07 TH |
2411 | unified_cache = CGROUP_UNIFIED_ALL; |
2412 | else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) { | |
2977724b | 2413 | if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 && |
f08e9287 | 2414 | F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { |
2977724b | 2415 | unified_cache = CGROUP_UNIFIED_SYSTEMD; |
f08e9287 TH |
2416 | unified_systemd_v232 = false; |
2417 | } else if (statfs("/sys/fs/cgroup/systemd/", &fs) == 0 && | |
2418 | F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { | |
2419 | unified_cache = CGROUP_UNIFIED_SYSTEMD; | |
2420 | unified_systemd_v232 = true; | |
2421 | } else { | |
2977724b TH |
2422 | if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0) |
2423 | return -errno; | |
2424 | if (!F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC)) | |
2425 | return -ENOMEDIUM; | |
2426 | unified_cache = CGROUP_UNIFIED_NONE; | |
2427 | } | |
5da38d07 | 2428 | } else |
8b3aa503 | 2429 | return -ENOMEDIUM; |
efdb0237 | 2430 | |
5da38d07 TH |
2431 | return 0; |
2432 | } | |
2433 | ||
c22800e4 | 2434 | int cg_unified_controller(const char *controller) { |
b4cccbc1 | 2435 | int r; |
5da38d07 | 2436 | |
1fcca10e | 2437 | r = cg_unified_update(); |
b4cccbc1 LP |
2438 | if (r < 0) |
2439 | return r; | |
5da38d07 | 2440 | |
fc9ae717 LP |
2441 | if (unified_cache == CGROUP_UNIFIED_NONE) |
2442 | return false; | |
2443 | ||
2444 | if (unified_cache >= CGROUP_UNIFIED_ALL) | |
2445 | return true; | |
2446 | ||
2447 | return streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER); | |
5da38d07 TH |
2448 | } |
2449 | ||
b4cccbc1 | 2450 | int cg_all_unified(void) { |
4bb652ac LP |
2451 | int r; |
2452 | ||
2453 | r = cg_unified_update(); | |
2454 | if (r < 0) | |
2455 | return r; | |
2456 | ||
2457 | return unified_cache >= CGROUP_UNIFIED_ALL; | |
efdb0237 LP |
2458 | } |
2459 | ||
b4cccbc1 LP |
2460 | int cg_hybrid_unified(void) { |
2461 | int r; | |
2977724b | 2462 | |
1fcca10e | 2463 | r = cg_unified_update(); |
b4cccbc1 LP |
2464 | if (r < 0) |
2465 | return r; | |
2977724b | 2466 | |
f08e9287 | 2467 | return unified_cache == CGROUP_UNIFIED_SYSTEMD && !unified_systemd_v232; |
2977724b TH |
2468 | } |
2469 | ||
415fc41c | 2470 | int cg_unified_flush(void) { |
5da38d07 | 2471 | unified_cache = CGROUP_UNIFIED_UNKNOWN; |
415fc41c | 2472 | |
1fcca10e | 2473 | return cg_unified_update(); |
efdb0237 LP |
2474 | } |
2475 | ||
2476 | int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) { | |
2477 | _cleanup_free_ char *fs = NULL; | |
2478 | CGroupController c; | |
415fc41c | 2479 | int r; |
efdb0237 LP |
2480 | |
2481 | assert(p); | |
2482 | ||
2483 | if (supported == 0) | |
2484 | return 0; | |
2485 | ||
b4cccbc1 LP |
2486 | r = cg_all_unified(); |
2487 | if (r < 0) | |
2488 | return r; | |
2489 | if (r == 0) /* on the legacy hiearchy there's no joining of controllers defined */ | |
efdb0237 LP |
2490 | return 0; |
2491 | ||
2492 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs); | |
2493 | if (r < 0) | |
2494 | return r; | |
2495 | ||
2496 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2497 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2498 | const char *n; | |
2499 | ||
2500 | if (!(supported & bit)) | |
2501 | continue; | |
2502 | ||
2503 | n = cgroup_controller_to_string(c); | |
2504 | { | |
2505 | char s[1 + strlen(n) + 1]; | |
2506 | ||
2507 | s[0] = mask & bit ? '+' : '-'; | |
2508 | strcpy(s + 1, n); | |
2509 | ||
2510 | r = write_string_file(fs, s, 0); | |
2511 | if (r < 0) | |
98e4d8d7 | 2512 | log_debug_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs); |
efdb0237 LP |
2513 | } |
2514 | } | |
2515 | ||
2516 | return 0; | |
2517 | } | |
2518 | ||
2519 | bool cg_is_unified_wanted(void) { | |
2520 | static thread_local int wanted = -1; | |
415fc41c | 2521 | int r; |
1d84ad94 | 2522 | bool b; |
77fab2a9 | 2523 | const bool is_default = DEFAULT_HIERARCHY == CGROUP_UNIFIED_ALL; |
efdb0237 | 2524 | |
77fab2a9 | 2525 | /* If we have a cached value, return that. */ |
efdb0237 LP |
2526 | if (wanted >= 0) |
2527 | return wanted; | |
2528 | ||
239a3d09 ZJS |
2529 | /* If the hierarchy is already mounted, then follow whatever |
2530 | * was chosen for it. */ | |
2531 | if (cg_unified_flush() >= 0) | |
b4cccbc1 | 2532 | return (wanted = unified_cache >= CGROUP_UNIFIED_ALL); |
239a3d09 | 2533 | |
77fab2a9 ZJS |
2534 | /* Otherwise, let's see what the kernel command line has to say. |
2535 | * Since checking is expensive, cache a non-error result. */ | |
1d84ad94 | 2536 | r = proc_cmdline_get_bool("systemd.unified_cgroup_hierarchy", &b); |
efdb0237 | 2537 | |
77fab2a9 | 2538 | return (wanted = r > 0 ? b : is_default); |
efdb0237 LP |
2539 | } |
2540 | ||
2541 | bool cg_is_legacy_wanted(void) { | |
239a3d09 ZJS |
2542 | static thread_local int wanted = -1; |
2543 | ||
2544 | /* If we have a cached value, return that. */ | |
2545 | if (wanted >= 0) | |
2546 | return wanted; | |
2547 | ||
1b59cf04 ZJS |
2548 | /* Check if we have cgroups2 already mounted. */ |
2549 | if (cg_unified_flush() >= 0 && | |
2550 | unified_cache == CGROUP_UNIFIED_ALL) | |
239a3d09 | 2551 | return (wanted = false); |
1b59cf04 ZJS |
2552 | |
2553 | /* Otherwise, assume that at least partial legacy is wanted, | |
2554 | * since cgroups2 should already be mounted at this point. */ | |
239a3d09 | 2555 | return (wanted = true); |
efdb0237 LP |
2556 | } |
2557 | ||
a4464b95 | 2558 | bool cg_is_hybrid_wanted(void) { |
5da38d07 | 2559 | static thread_local int wanted = -1; |
415fc41c | 2560 | int r; |
1d84ad94 | 2561 | bool b; |
c19739db ZJS |
2562 | const bool is_default = DEFAULT_HIERARCHY >= CGROUP_UNIFIED_SYSTEMD; |
2563 | /* We default to true if the default is "hybrid", obviously, | |
2564 | * but also when the default is "unified", because if we get | |
2565 | * called, it means that unified hierarchy was not mounted. */ | |
5da38d07 | 2566 | |
77fab2a9 | 2567 | /* If we have a cached value, return that. */ |
5da38d07 TH |
2568 | if (wanted >= 0) |
2569 | return wanted; | |
2570 | ||
239a3d09 ZJS |
2571 | /* If the hierarchy is already mounted, then follow whatever |
2572 | * was chosen for it. */ | |
2573 | if (cg_unified_flush() >= 0 && | |
2574 | unified_cache == CGROUP_UNIFIED_ALL) | |
2575 | return (wanted = false); | |
2576 | ||
77fab2a9 ZJS |
2577 | /* Otherwise, let's see what the kernel command line has to say. |
2578 | * Since checking is expensive, cache a non-error result. */ | |
1d84ad94 | 2579 | r = proc_cmdline_get_bool("systemd.legacy_systemd_cgroup_controller", &b); |
5da38d07 | 2580 | |
2dcb526d ZJS |
2581 | /* The meaning of the kernel option is reversed wrt. to the return value |
2582 | * of this function, hence the negation. */ | |
77fab2a9 | 2583 | return (wanted = r > 0 ? !b : is_default); |
5da38d07 TH |
2584 | } |
2585 | ||
13c31542 TH |
2586 | int cg_weight_parse(const char *s, uint64_t *ret) { |
2587 | uint64_t u; | |
2588 | int r; | |
2589 | ||
2590 | if (isempty(s)) { | |
2591 | *ret = CGROUP_WEIGHT_INVALID; | |
2592 | return 0; | |
2593 | } | |
2594 | ||
2595 | r = safe_atou64(s, &u); | |
2596 | if (r < 0) | |
2597 | return r; | |
2598 | ||
2599 | if (u < CGROUP_WEIGHT_MIN || u > CGROUP_WEIGHT_MAX) | |
2600 | return -ERANGE; | |
2601 | ||
2602 | *ret = u; | |
2603 | return 0; | |
2604 | } | |
2605 | ||
9be57249 TH |
2606 | const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX] = { |
2607 | [CGROUP_IO_RBPS_MAX] = CGROUP_LIMIT_MAX, | |
2608 | [CGROUP_IO_WBPS_MAX] = CGROUP_LIMIT_MAX, | |
ac06a0cf TH |
2609 | [CGROUP_IO_RIOPS_MAX] = CGROUP_LIMIT_MAX, |
2610 | [CGROUP_IO_WIOPS_MAX] = CGROUP_LIMIT_MAX, | |
9be57249 TH |
2611 | }; |
2612 | ||
2613 | static const char* const cgroup_io_limit_type_table[_CGROUP_IO_LIMIT_TYPE_MAX] = { | |
2614 | [CGROUP_IO_RBPS_MAX] = "IOReadBandwidthMax", | |
2615 | [CGROUP_IO_WBPS_MAX] = "IOWriteBandwidthMax", | |
ac06a0cf TH |
2616 | [CGROUP_IO_RIOPS_MAX] = "IOReadIOPSMax", |
2617 | [CGROUP_IO_WIOPS_MAX] = "IOWriteIOPSMax", | |
9be57249 TH |
2618 | }; |
2619 | ||
2620 | DEFINE_STRING_TABLE_LOOKUP(cgroup_io_limit_type, CGroupIOLimitType); | |
2621 | ||
d53d9474 LP |
2622 | int cg_cpu_shares_parse(const char *s, uint64_t *ret) { |
2623 | uint64_t u; | |
2624 | int r; | |
2625 | ||
2626 | if (isempty(s)) { | |
2627 | *ret = CGROUP_CPU_SHARES_INVALID; | |
2628 | return 0; | |
2629 | } | |
2630 | ||
2631 | r = safe_atou64(s, &u); | |
2632 | if (r < 0) | |
2633 | return r; | |
2634 | ||
2635 | if (u < CGROUP_CPU_SHARES_MIN || u > CGROUP_CPU_SHARES_MAX) | |
2636 | return -ERANGE; | |
2637 | ||
2638 | *ret = u; | |
2639 | return 0; | |
2640 | } | |
2641 | ||
2642 | int cg_blkio_weight_parse(const char *s, uint64_t *ret) { | |
2643 | uint64_t u; | |
2644 | int r; | |
2645 | ||
2646 | if (isempty(s)) { | |
2647 | *ret = CGROUP_BLKIO_WEIGHT_INVALID; | |
2648 | return 0; | |
2649 | } | |
2650 | ||
2651 | r = safe_atou64(s, &u); | |
2652 | if (r < 0) | |
2653 | return r; | |
2654 | ||
2655 | if (u < CGROUP_BLKIO_WEIGHT_MIN || u > CGROUP_BLKIO_WEIGHT_MAX) | |
2656 | return -ERANGE; | |
2657 | ||
2658 | *ret = u; | |
2659 | return 0; | |
2660 | } | |
2661 | ||
f0bef277 EV |
2662 | bool is_cgroup_fs(const struct statfs *s) { |
2663 | return is_fs_type(s, CGROUP_SUPER_MAGIC) || | |
2664 | is_fs_type(s, CGROUP2_SUPER_MAGIC); | |
2665 | } | |
2666 | ||
2667 | bool fd_is_cgroup_fs(int fd) { | |
2668 | struct statfs s; | |
2669 | ||
2670 | if (fstatfs(fd, &s) < 0) | |
2671 | return -errno; | |
2672 | ||
2673 | return is_cgroup_fs(&s); | |
2674 | } | |
2675 | ||
efdb0237 LP |
2676 | static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = { |
2677 | [CGROUP_CONTROLLER_CPU] = "cpu", | |
2678 | [CGROUP_CONTROLLER_CPUACCT] = "cpuacct", | |
13c31542 | 2679 | [CGROUP_CONTROLLER_IO] = "io", |
efdb0237 LP |
2680 | [CGROUP_CONTROLLER_BLKIO] = "blkio", |
2681 | [CGROUP_CONTROLLER_MEMORY] = "memory", | |
3905f127 | 2682 | [CGROUP_CONTROLLER_DEVICES] = "devices", |
03a7b521 | 2683 | [CGROUP_CONTROLLER_PIDS] = "pids", |
efdb0237 LP |
2684 | }; |
2685 | ||
2686 | DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController); |