]>
Commit | Line | Data |
---|---|---|
d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8c6db833 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
8c6db833 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8c6db833 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8c6db833 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <unistd.h> | |
24 | #include <signal.h> | |
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
35d2e7ec | 27 | #include <dirent.h> |
672c48cc LP |
28 | #include <sys/stat.h> |
29 | #include <sys/types.h> | |
e27796a0 | 30 | #include <ftw.h> |
8c6db833 LP |
31 | |
32 | #include "cgroup-util.h" | |
33 | #include "log.h" | |
34 | #include "set.h" | |
35 | #include "macro.h" | |
36 | #include "util.h" | |
9eb977db | 37 | #include "path-util.h" |
b59e2465 | 38 | #include "strv.h" |
ef1673d1 | 39 | #include "unit-name.h" |
a5c32cff | 40 | #include "fileio.h" |
9444b1f2 | 41 | #include "special.h" |
1434ae6f | 42 | #include "mkdir.h" |
8c6db833 | 43 | |
c6c18be3 | 44 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
7027ff61 | 45 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 46 | FILE *f; |
7027ff61 | 47 | int r; |
c6c18be3 | 48 | |
c6c18be3 LP |
49 | assert(_f); |
50 | ||
c3175a7f LP |
51 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
52 | if (r < 0) | |
c6c18be3 LP |
53 | return r; |
54 | ||
55 | f = fopen(fs, "re"); | |
c6c18be3 LP |
56 | if (!f) |
57 | return -errno; | |
58 | ||
59 | *_f = f; | |
60 | return 0; | |
61 | } | |
62 | ||
c6c18be3 LP |
63 | int cg_read_pid(FILE *f, pid_t *_pid) { |
64 | unsigned long ul; | |
65 | ||
66 | /* Note that the cgroup.procs might contain duplicates! See | |
67 | * cgroups.txt for details. */ | |
68 | ||
7027ff61 LP |
69 | assert(f); |
70 | assert(_pid); | |
71 | ||
c6c18be3 LP |
72 | errno = 0; |
73 | if (fscanf(f, "%lu", &ul) != 1) { | |
74 | ||
75 | if (feof(f)) | |
76 | return 0; | |
77 | ||
78 | return errno ? -errno : -EIO; | |
79 | } | |
80 | ||
81 | if (ul <= 0) | |
82 | return -EIO; | |
83 | ||
84 | *_pid = (pid_t) ul; | |
85 | return 1; | |
86 | } | |
87 | ||
35d2e7ec | 88 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
7027ff61 | 89 | _cleanup_free_ char *fs = NULL; |
35d2e7ec LP |
90 | int r; |
91 | DIR *d; | |
92 | ||
35d2e7ec LP |
93 | assert(_d); |
94 | ||
95 | /* This is not recursive! */ | |
96 | ||
c3175a7f LP |
97 | r = cg_get_path(controller, path, NULL, &fs); |
98 | if (r < 0) | |
35d2e7ec LP |
99 | return r; |
100 | ||
101 | d = opendir(fs); | |
35d2e7ec LP |
102 | if (!d) |
103 | return -errno; | |
104 | ||
105 | *_d = d; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | int cg_read_subgroup(DIR *d, char **fn) { | |
110 | struct dirent *de; | |
111 | ||
112 | assert(d); | |
7027ff61 | 113 | assert(fn); |
35d2e7ec | 114 | |
7027ff61 | 115 | FOREACH_DIRENT(de, d, return -errno) { |
35d2e7ec LP |
116 | char *b; |
117 | ||
118 | if (de->d_type != DT_DIR) | |
119 | continue; | |
120 | ||
121 | if (streq(de->d_name, ".") || | |
122 | streq(de->d_name, "..")) | |
123 | continue; | |
124 | ||
7027ff61 LP |
125 | b = strdup(de->d_name); |
126 | if (!b) | |
35d2e7ec LP |
127 | return -ENOMEM; |
128 | ||
129 | *fn = b; | |
130 | return 1; | |
131 | } | |
132 | ||
35d2e7ec LP |
133 | return 0; |
134 | } | |
135 | ||
4ad49000 | 136 | int cg_rmdir(const char *controller, const char *path) { |
7027ff61 | 137 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
138 | int r; |
139 | ||
ad293f5a LP |
140 | r = cg_get_path(controller, path, NULL, &p); |
141 | if (r < 0) | |
35d2e7ec LP |
142 | return r; |
143 | ||
144 | r = rmdir(p); | |
7027ff61 LP |
145 | if (r < 0 && errno != ENOENT) |
146 | return -errno; | |
35d2e7ec | 147 | |
7027ff61 | 148 | return 0; |
35d2e7ec LP |
149 | } |
150 | ||
430c18ed | 151 | int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { |
7027ff61 | 152 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 153 | bool done = false; |
8c6db833 | 154 | int r, ret = 0; |
35d2e7ec | 155 | pid_t my_pid; |
8c6db833 | 156 | |
8c6db833 LP |
157 | assert(sig >= 0); |
158 | ||
159 | /* This goes through the tasks list and kills them all. This | |
160 | * is repeated until no further processes are added to the | |
161 | * tasks list, to properly handle forking processes */ | |
162 | ||
7027ff61 | 163 | if (!s) { |
d5099efc | 164 | s = allocated_set = set_new(NULL); |
7027ff61 | 165 | if (!s) |
ca949c9d | 166 | return -ENOMEM; |
7027ff61 | 167 | } |
8c6db833 LP |
168 | |
169 | my_pid = getpid(); | |
170 | ||
171 | do { | |
7027ff61 | 172 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 173 | pid_t pid = 0; |
8c6db833 LP |
174 | done = true; |
175 | ||
7027ff61 LP |
176 | r = cg_enumerate_processes(controller, path, &f); |
177 | if (r < 0) { | |
4c633005 | 178 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 179 | return r; |
35d2e7ec | 180 | |
7027ff61 | 181 | return ret; |
35d2e7ec | 182 | } |
c6c18be3 LP |
183 | |
184 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 185 | |
7027ff61 | 186 | if (ignore_self && pid == my_pid) |
c6c18be3 | 187 | continue; |
8c6db833 | 188 | |
c6c18be3 LP |
189 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
190 | continue; | |
8c6db833 LP |
191 | |
192 | /* If we haven't killed this process yet, kill | |
193 | * it */ | |
4c633005 LP |
194 | if (kill(pid, sig) < 0) { |
195 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 196 | ret = -errno; |
6e8314c4 | 197 | } else { |
430c18ed LP |
198 | if (sigcont) |
199 | kill(pid, SIGCONT); | |
200 | ||
6e8314c4 LP |
201 | if (ret == 0) |
202 | ret = 1; | |
430c18ed | 203 | } |
8c6db833 | 204 | |
8c6db833 LP |
205 | done = false; |
206 | ||
7027ff61 LP |
207 | r = set_put(s, LONG_TO_PTR(pid)); |
208 | if (r < 0) { | |
35d2e7ec | 209 | if (ret >= 0) |
7027ff61 | 210 | return r; |
35d2e7ec | 211 | |
7027ff61 | 212 | return ret; |
35d2e7ec LP |
213 | } |
214 | } | |
215 | ||
216 | if (r < 0) { | |
217 | if (ret >= 0) | |
7027ff61 | 218 | return r; |
35d2e7ec | 219 | |
7027ff61 | 220 | return ret; |
8c6db833 LP |
221 | } |
222 | ||
8c6db833 LP |
223 | /* To avoid racing against processes which fork |
224 | * quicker than we can kill them we repeat this until | |
225 | * no new pids need to be killed. */ | |
226 | ||
35d2e7ec | 227 | } while (!done); |
8c6db833 | 228 | |
35d2e7ec | 229 | return ret; |
8c6db833 LP |
230 | } |
231 | ||
430c18ed | 232 | int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { |
7027ff61 LP |
233 | _cleanup_set_free_ Set *allocated_set = NULL; |
234 | _cleanup_closedir_ DIR *d = NULL; | |
35d2e7ec | 235 | int r, ret = 0; |
35d2e7ec | 236 | char *fn; |
8c6db833 LP |
237 | |
238 | assert(path); | |
8c6db833 LP |
239 | assert(sig >= 0); |
240 | ||
7027ff61 | 241 | if (!s) { |
d5099efc | 242 | s = allocated_set = set_new(NULL); |
7027ff61 | 243 | if (!s) |
ca949c9d | 244 | return -ENOMEM; |
7027ff61 | 245 | } |
ca949c9d | 246 | |
430c18ed | 247 | ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); |
8c6db833 | 248 | |
7027ff61 LP |
249 | r = cg_enumerate_subgroups(controller, path, &d); |
250 | if (r < 0) { | |
4c633005 | 251 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 252 | return r; |
8c6db833 | 253 | |
7027ff61 | 254 | return ret; |
35d2e7ec | 255 | } |
8c6db833 | 256 | |
35d2e7ec | 257 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 258 | _cleanup_free_ char *p = NULL; |
8c6db833 | 259 | |
7027ff61 | 260 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 261 | free(fn); |
7027ff61 LP |
262 | if (!p) |
263 | return -ENOMEM; | |
8c6db833 | 264 | |
430c18ed | 265 | r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); |
7027ff61 | 266 | if (ret >= 0 && r != 0) |
35d2e7ec | 267 | ret = r; |
8c6db833 LP |
268 | } |
269 | ||
7027ff61 | 270 | if (ret >= 0 && r < 0) |
35d2e7ec LP |
271 | ret = r; |
272 | ||
7027ff61 | 273 | if (rem) { |
4ad49000 | 274 | r = cg_rmdir(controller, path); |
7027ff61 LP |
275 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
276 | return r; | |
277 | } | |
ca949c9d | 278 | |
8c6db833 LP |
279 | return ret; |
280 | } | |
281 | ||
246aa6dd | 282 | int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) { |
35d2e7ec | 283 | bool done = false; |
246aa6dd | 284 | _cleanup_set_free_ Set *s = NULL; |
8c6db833 LP |
285 | int r, ret = 0; |
286 | pid_t my_pid; | |
287 | ||
246aa6dd LP |
288 | assert(cfrom); |
289 | assert(pfrom); | |
290 | assert(cto); | |
291 | assert(pto); | |
8c6db833 | 292 | |
d5099efc | 293 | s = set_new(NULL); |
246aa6dd | 294 | if (!s) |
35d2e7ec LP |
295 | return -ENOMEM; |
296 | ||
8c6db833 LP |
297 | my_pid = getpid(); |
298 | ||
299 | do { | |
7027ff61 | 300 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 301 | pid_t pid = 0; |
8c6db833 LP |
302 | done = true; |
303 | ||
b043cd0b | 304 | r = cg_enumerate_processes(cfrom, pfrom, &f); |
246aa6dd | 305 | if (r < 0) { |
4c633005 | 306 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 307 | return r; |
35d2e7ec | 308 | |
246aa6dd | 309 | return ret; |
35d2e7ec | 310 | } |
c6c18be3 LP |
311 | |
312 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 313 | |
35d2e7ec LP |
314 | /* This might do weird stuff if we aren't a |
315 | * single-threaded program. However, we | |
316 | * luckily know we are not */ | |
7027ff61 | 317 | if (ignore_self && pid == my_pid) |
c6c18be3 | 318 | continue; |
8c6db833 | 319 | |
35d2e7ec LP |
320 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
321 | continue; | |
322 | ||
246aa6dd LP |
323 | r = cg_attach(cto, pto, pid); |
324 | if (r < 0) { | |
4c633005 | 325 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
326 | ret = r; |
327 | } else if (ret == 0) | |
328 | ret = 1; | |
8c6db833 | 329 | |
8c6db833 | 330 | done = false; |
35d2e7ec | 331 | |
246aa6dd LP |
332 | r = set_put(s, LONG_TO_PTR(pid)); |
333 | if (r < 0) { | |
35d2e7ec | 334 | if (ret >= 0) |
7027ff61 | 335 | return r; |
35d2e7ec | 336 | |
246aa6dd | 337 | return ret; |
35d2e7ec LP |
338 | } |
339 | } | |
340 | ||
341 | if (r < 0) { | |
342 | if (ret >= 0) | |
7027ff61 | 343 | return r; |
35d2e7ec | 344 | |
246aa6dd | 345 | return ret; |
8c6db833 | 346 | } |
35d2e7ec | 347 | } while (!done); |
8c6db833 | 348 | |
35d2e7ec | 349 | return ret; |
8c6db833 LP |
350 | } |
351 | ||
4ad49000 LP |
352 | int cg_migrate_recursive( |
353 | const char *cfrom, | |
354 | const char *pfrom, | |
355 | const char *cto, | |
356 | const char *pto, | |
357 | bool ignore_self, | |
358 | bool rem) { | |
359 | ||
246aa6dd | 360 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 361 | int r, ret = 0; |
35d2e7ec | 362 | char *fn; |
8c6db833 | 363 | |
246aa6dd LP |
364 | assert(cfrom); |
365 | assert(pfrom); | |
366 | assert(cto); | |
367 | assert(pto); | |
8c6db833 | 368 | |
246aa6dd | 369 | ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self); |
8c6db833 | 370 | |
246aa6dd LP |
371 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
372 | if (r < 0) { | |
4c633005 | 373 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
374 | return r; |
375 | ||
246aa6dd | 376 | return ret; |
35d2e7ec LP |
377 | } |
378 | ||
379 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 380 | _cleanup_free_ char *p = NULL; |
8c6db833 | 381 | |
246aa6dd | 382 | p = strjoin(pfrom, "/", fn, NULL); |
35d2e7ec | 383 | free(fn); |
246aa6dd | 384 | if (!p) { |
35d2e7ec | 385 | if (ret >= 0) |
7027ff61 | 386 | return -ENOMEM; |
35d2e7ec | 387 | |
246aa6dd | 388 | return ret; |
8c6db833 LP |
389 | } |
390 | ||
246aa6dd | 391 | r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem); |
35d2e7ec LP |
392 | if (r != 0 && ret >= 0) |
393 | ret = r; | |
8c6db833 LP |
394 | } |
395 | ||
35d2e7ec LP |
396 | if (r < 0 && ret >= 0) |
397 | ret = r; | |
398 | ||
246aa6dd | 399 | if (rem) { |
4ad49000 | 400 | r = cg_rmdir(cfrom, pfrom); |
246aa6dd LP |
401 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
402 | return r; | |
403 | } | |
8c6db833 LP |
404 | |
405 | return ret; | |
406 | } | |
407 | ||
13b84ec7 LP |
408 | int cg_migrate_recursive_fallback( |
409 | const char *cfrom, | |
410 | const char *pfrom, | |
411 | const char *cto, | |
412 | const char *pto, | |
413 | bool ignore_self, | |
414 | bool rem) { | |
415 | ||
416 | int r; | |
417 | ||
418 | assert(cfrom); | |
419 | assert(pfrom); | |
420 | assert(cto); | |
421 | assert(pto); | |
422 | ||
423 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem); | |
424 | if (r < 0) { | |
425 | char prefix[strlen(pto) + 1]; | |
426 | ||
427 | /* This didn't work? Then let's try all prefixes of the destination */ | |
428 | ||
fecffe5d | 429 | PATH_FOREACH_PREFIX(prefix, pto) { |
13b84ec7 LP |
430 | r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem); |
431 | if (r >= 0) | |
432 | break; | |
433 | } | |
434 | } | |
435 | ||
fecffe5d | 436 | return 0; |
13b84ec7 LP |
437 | } |
438 | ||
3474ae3c LP |
439 | static const char *normalize_controller(const char *controller) { |
440 | ||
7027ff61 LP |
441 | assert(controller); |
442 | ||
3474ae3c LP |
443 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
444 | return "systemd"; | |
445 | else if (startswith(controller, "name=")) | |
446 | return controller + 5; | |
447 | else | |
448 | return controller; | |
449 | } | |
450 | ||
451 | static int join_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
018ef268 | 452 | char *t = NULL; |
3474ae3c | 453 | |
9444b1f2 LP |
454 | if (!isempty(controller)) { |
455 | if (!isempty(path) && !isempty(suffix)) | |
b7def684 | 456 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL); |
9444b1f2 | 457 | else if (!isempty(path)) |
b7def684 | 458 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL); |
9444b1f2 | 459 | else if (!isempty(suffix)) |
b7def684 | 460 | t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL); |
c3175a7f | 461 | else |
7027ff61 | 462 | t = strappend("/sys/fs/cgroup/", controller); |
c3175a7f | 463 | } else { |
9444b1f2 | 464 | if (!isempty(path) && !isempty(suffix)) |
b7def684 | 465 | t = strjoin(path, "/", suffix, NULL); |
9444b1f2 | 466 | else if (!isempty(path)) |
c3175a7f | 467 | t = strdup(path); |
7027ff61 LP |
468 | else |
469 | return -EINVAL; | |
c3175a7f | 470 | } |
3474ae3c LP |
471 | |
472 | if (!t) | |
473 | return -ENOMEM; | |
474 | ||
dbb9401d | 475 | *fs = path_kill_slashes(t); |
3474ae3c LP |
476 | return 0; |
477 | } | |
478 | ||
8c6db833 | 479 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
dbd821ac | 480 | const char *p; |
ec202eae | 481 | static thread_local bool good = false; |
8c6db833 | 482 | |
dbd821ac LP |
483 | assert(fs); |
484 | ||
78edb35a LP |
485 | if (controller && !cg_controller_is_valid(controller, true)) |
486 | return -EINVAL; | |
487 | ||
3bfc7184 | 488 | if (_unlikely_(!good)) { |
70132bd0 LP |
489 | int r; |
490 | ||
0c85a4f3 | 491 | r = path_is_mount_point("/sys/fs/cgroup", false); |
70132bd0 LP |
492 | if (r <= 0) |
493 | return r < 0 ? r : -ENOENT; | |
494 | ||
495 | /* Cache this to save a few stat()s */ | |
496 | good = true; | |
497 | } | |
498 | ||
c3175a7f | 499 | p = controller ? normalize_controller(controller) : NULL; |
7027ff61 | 500 | |
3474ae3c LP |
501 | return join_path(p, path, suffix, fs); |
502 | } | |
dbd821ac | 503 | |
7027ff61 | 504 | static int check_hierarchy(const char *p) { |
37099707 LP |
505 | char *cc; |
506 | ||
507 | assert(p); | |
508 | ||
509 | /* Check if this controller actually really exists */ | |
f8294e41 | 510 | cc = alloca(strlen("/sys/fs/cgroup/") + strlen(p) + 1); |
37099707 LP |
511 | strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p); |
512 | if (access(cc, F_OK) < 0) | |
513 | return -errno; | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
3474ae3c LP |
518 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
519 | const char *p; | |
37099707 | 520 | int r; |
dbd821ac | 521 | |
3474ae3c | 522 | assert(fs); |
70132bd0 | 523 | |
78edb35a | 524 | if (!cg_controller_is_valid(controller, true)) |
3474ae3c | 525 | return -EINVAL; |
70132bd0 | 526 | |
37099707 | 527 | /* Normalize the controller syntax */ |
3474ae3c | 528 | p = normalize_controller(controller); |
8c6db833 | 529 | |
3474ae3c | 530 | /* Check if this controller actually really exists */ |
7027ff61 | 531 | r = check_hierarchy(p); |
37099707 LP |
532 | if (r < 0) |
533 | return r; | |
3474ae3c LP |
534 | |
535 | return join_path(p, path, suffix, fs); | |
8c6db833 LP |
536 | } |
537 | ||
e27796a0 | 538 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
4ad49000 LP |
539 | assert(path); |
540 | assert(sb); | |
541 | assert(ftwbuf); | |
e27796a0 LP |
542 | |
543 | if (typeflag != FTW_DP) | |
544 | return 0; | |
545 | ||
546 | if (ftwbuf->level < 1) | |
547 | return 0; | |
548 | ||
e27796a0 LP |
549 | rmdir(path); |
550 | return 0; | |
551 | } | |
552 | ||
8c6db833 | 553 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 554 | _cleanup_free_ char *fs = NULL; |
e27796a0 | 555 | int r = 0; |
8c6db833 | 556 | |
8c6db833 LP |
557 | assert(path); |
558 | ||
e27796a0 LP |
559 | r = cg_get_path(controller, path, NULL, &fs); |
560 | if (r < 0) | |
8c6db833 LP |
561 | return r; |
562 | ||
e27796a0 | 563 | errno = 0; |
7027ff61 | 564 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) |
e27796a0 LP |
565 | r = errno ? -errno : -EIO; |
566 | ||
567 | if (delete_root) { | |
4ad49000 LP |
568 | if (rmdir(fs) < 0 && errno != ENOENT) |
569 | return -errno; | |
e27796a0 LP |
570 | } |
571 | ||
e27796a0 | 572 | return r; |
8c6db833 LP |
573 | } |
574 | ||
575 | int cg_delete(const char *controller, const char *path) { | |
7027ff61 | 576 | _cleanup_free_ char *parent = NULL; |
8c6db833 LP |
577 | int r; |
578 | ||
8c6db833 LP |
579 | assert(path); |
580 | ||
7027ff61 LP |
581 | r = path_get_parent(path, &parent); |
582 | if (r < 0) | |
35d2e7ec | 583 | return r; |
8c6db833 | 584 | |
246aa6dd | 585 | r = cg_migrate_recursive(controller, path, controller, parent, false, true); |
4c633005 | 586 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
587 | } |
588 | ||
1434ae6f LP |
589 | int cg_create(const char *controller, const char *path) { |
590 | _cleanup_free_ char *fs = NULL; | |
591 | int r; | |
592 | ||
593 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
594 | if (r < 0) | |
595 | return r; | |
596 | ||
597 | r = mkdir_parents(fs, 0755); | |
598 | if (r < 0) | |
599 | return r; | |
600 | ||
601 | if (mkdir(fs, 0755) < 0) { | |
602 | ||
603 | if (errno == EEXIST) | |
604 | return 0; | |
605 | ||
606 | return -errno; | |
607 | } | |
608 | ||
609 | return 1; | |
610 | } | |
611 | ||
612 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
613 | int r, q; | |
614 | ||
615 | assert(pid >= 0); | |
616 | ||
617 | r = cg_create(controller, path); | |
618 | if (r < 0) | |
619 | return r; | |
620 | ||
621 | q = cg_attach(controller, path, pid); | |
622 | if (q < 0) | |
623 | return q; | |
624 | ||
625 | /* This does not remove the cgroup on failure */ | |
626 | return r; | |
627 | } | |
628 | ||
8c6db833 | 629 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
630 | _cleanup_free_ char *fs = NULL; |
631 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
632 | int r; |
633 | ||
8c6db833 LP |
634 | assert(path); |
635 | assert(pid >= 0); | |
636 | ||
b043cd0b | 637 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
3474ae3c | 638 | if (r < 0) |
c6c18be3 | 639 | return r; |
8c6db833 LP |
640 | |
641 | if (pid == 0) | |
642 | pid = getpid(); | |
643 | ||
de0671ee | 644 | snprintf(c, sizeof(c), PID_FMT"\n", pid); |
8c6db833 | 645 | |
70c949a4 | 646 | return write_string_file_no_create(fs, c); |
8c6db833 LP |
647 | } |
648 | ||
13b84ec7 LP |
649 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
650 | int r; | |
651 | ||
652 | assert(controller); | |
653 | assert(path); | |
654 | assert(pid >= 0); | |
655 | ||
656 | r = cg_attach(controller, path, pid); | |
657 | if (r < 0) { | |
658 | char prefix[strlen(path) + 1]; | |
659 | ||
660 | /* This didn't work? Then let's try all prefixes of | |
661 | * the destination */ | |
662 | ||
fecffe5d | 663 | PATH_FOREACH_PREFIX(prefix, path) { |
13b84ec7 LP |
664 | r = cg_attach(controller, prefix, pid); |
665 | if (r >= 0) | |
666 | break; | |
667 | } | |
668 | } | |
669 | ||
fecffe5d | 670 | return 0; |
13b84ec7 LP |
671 | } |
672 | ||
2d76d14e LP |
673 | int cg_set_group_access( |
674 | const char *controller, | |
675 | const char *path, | |
676 | mode_t mode, | |
677 | uid_t uid, | |
678 | gid_t gid) { | |
679 | ||
574d5f2d | 680 | _cleanup_free_ char *fs = NULL; |
8c6db833 LP |
681 | int r; |
682 | ||
8c6db833 LP |
683 | assert(path); |
684 | ||
8d53b453 LP |
685 | if (mode != (mode_t) -1) |
686 | mode &= 0777; | |
687 | ||
688 | r = cg_get_path(controller, path, NULL, &fs); | |
689 | if (r < 0) | |
8c6db833 LP |
690 | return r; |
691 | ||
574d5f2d | 692 | return chmod_and_chown(fs, mode, uid, gid); |
8c6db833 LP |
693 | } |
694 | ||
974efc46 LP |
695 | int cg_set_task_access( |
696 | const char *controller, | |
697 | const char *path, | |
698 | mode_t mode, | |
699 | uid_t uid, | |
4ad49000 | 700 | gid_t gid) { |
974efc46 LP |
701 | |
702 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
8c6db833 LP |
703 | int r; |
704 | ||
8c6db833 LP |
705 | assert(path); |
706 | ||
4ad49000 | 707 | if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1) |
8d53b453 LP |
708 | return 0; |
709 | ||
710 | if (mode != (mode_t) -1) | |
711 | mode &= 0666; | |
712 | ||
b043cd0b | 713 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
8d53b453 | 714 | if (r < 0) |
8c6db833 LP |
715 | return r; |
716 | ||
717 | r = chmod_and_chown(fs, mode, uid, gid); | |
974efc46 LP |
718 | if (r < 0) |
719 | return r; | |
8c6db833 | 720 | |
b043cd0b LP |
721 | /* Compatibility, Always keep values for "tasks" in sync with |
722 | * "cgroup.procs" */ | |
723 | r = cg_get_path(controller, path, "tasks", &procs); | |
974efc46 LP |
724 | if (r < 0) |
725 | return r; | |
726 | ||
727 | return chmod_and_chown(procs, mode, uid, gid); | |
8c6db833 LP |
728 | } |
729 | ||
7027ff61 | 730 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
7027ff61 LP |
731 | _cleanup_fclose_ FILE *f = NULL; |
732 | char line[LINE_MAX]; | |
8af8afd6 | 733 | const char *fs; |
c6c18be3 | 734 | size_t cs; |
8c6db833 | 735 | |
8c6db833 | 736 | assert(path); |
c6c18be3 | 737 | assert(pid >= 0); |
8c6db833 | 738 | |
8af8afd6 LP |
739 | if (controller) { |
740 | if (!cg_controller_is_valid(controller, true)) | |
741 | return -EINVAL; | |
78edb35a | 742 | |
8af8afd6 LP |
743 | controller = normalize_controller(controller); |
744 | } else | |
7027ff61 LP |
745 | controller = SYSTEMD_CGROUP_CONTROLLER; |
746 | ||
b68fa010 | 747 | fs = procfs_file_alloca(pid, "cgroup"); |
8c6db833 | 748 | |
c6c18be3 | 749 | f = fopen(fs, "re"); |
4c633005 LP |
750 | if (!f) |
751 | return errno == ENOENT ? -ESRCH : -errno; | |
752 | ||
c6c18be3 LP |
753 | cs = strlen(controller); |
754 | ||
7027ff61 | 755 | FOREACH_LINE(line, f, return -errno) { |
a2a5291b | 756 | char *l, *p, *e; |
8af8afd6 | 757 | size_t k; |
a2a5291b | 758 | const char *word, *state; |
8af8afd6 | 759 | bool found = false; |
c6c18be3 LP |
760 | |
761 | truncate_nl(line); | |
762 | ||
7027ff61 LP |
763 | l = strchr(line, ':'); |
764 | if (!l) | |
c6c18be3 LP |
765 | continue; |
766 | ||
767 | l++; | |
8af8afd6 LP |
768 | e = strchr(l, ':'); |
769 | if (!e) | |
c6c18be3 LP |
770 | continue; |
771 | ||
8af8afd6 LP |
772 | *e = 0; |
773 | ||
a2a5291b | 774 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { |
8af8afd6 | 775 | |
a2a5291b | 776 | if (k == cs && memcmp(word, controller, cs) == 0) { |
8af8afd6 LP |
777 | found = true; |
778 | break; | |
779 | } | |
780 | ||
781 | if (k == 5 + cs && | |
a2a5291b ZJS |
782 | memcmp(word, "name=", 5) == 0 && |
783 | memcmp(word+5, controller, cs) == 0) { | |
8af8afd6 LP |
784 | found = true; |
785 | break; | |
786 | } | |
787 | } | |
788 | ||
789 | if (!found) | |
c6c18be3 LP |
790 | continue; |
791 | ||
8af8afd6 | 792 | p = strdup(e + 1); |
7027ff61 LP |
793 | if (!p) |
794 | return -ENOMEM; | |
c6c18be3 LP |
795 | |
796 | *path = p; | |
7027ff61 | 797 | return 0; |
c6c18be3 LP |
798 | } |
799 | ||
7027ff61 | 800 | return -ENOENT; |
8c6db833 LP |
801 | } |
802 | ||
803 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 LP |
804 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
805 | char *sc; | |
8c6db833 LP |
806 | int r; |
807 | ||
8c6db833 LP |
808 | assert(agent); |
809 | ||
7027ff61 LP |
810 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
811 | if (r < 0) | |
c6c18be3 | 812 | return r; |
8c6db833 | 813 | |
7027ff61 LP |
814 | r = read_one_line_file(fs, &contents); |
815 | if (r < 0) | |
816 | return r; | |
8c6db833 LP |
817 | |
818 | sc = strstrip(contents); | |
8c6db833 | 819 | if (sc[0] == 0) { |
70c949a4 | 820 | r = write_string_file_no_create(fs, agent); |
574d5f2d | 821 | if (r < 0) |
7027ff61 LP |
822 | return r; |
823 | } else if (!streq(sc, agent)) | |
824 | return -EEXIST; | |
8c6db833 | 825 | |
c6c18be3 LP |
826 | free(fs); |
827 | fs = NULL; | |
7027ff61 LP |
828 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
829 | if (r < 0) | |
830 | return r; | |
8c6db833 LP |
831 | |
832 | free(contents); | |
833 | contents = NULL; | |
7027ff61 LP |
834 | r = read_one_line_file(fs, &contents); |
835 | if (r < 0) | |
836 | return r; | |
8c6db833 LP |
837 | |
838 | sc = strstrip(contents); | |
8c6db833 | 839 | if (streq(sc, "0")) { |
70c949a4 | 840 | r = write_string_file_no_create(fs, "1"); |
7027ff61 LP |
841 | if (r < 0) |
842 | return r; | |
c6c18be3 | 843 | |
7027ff61 LP |
844 | return 1; |
845 | } | |
8c6db833 | 846 | |
7027ff61 LP |
847 | if (!streq(sc, "1")) |
848 | return -EIO; | |
8c6db833 | 849 | |
7027ff61 | 850 | return 0; |
8c6db833 LP |
851 | } |
852 | ||
ad929bcc KS |
853 | int cg_uninstall_release_agent(const char *controller) { |
854 | _cleanup_free_ char *fs = NULL; | |
855 | int r; | |
856 | ||
ac9ef333 LP |
857 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
858 | if (r < 0) | |
859 | return r; | |
860 | ||
70c949a4 | 861 | r = write_string_file_no_create(fs, "0"); |
ac9ef333 LP |
862 | if (r < 0) |
863 | return r; | |
864 | ||
865 | free(fs); | |
866 | fs = NULL; | |
867 | ||
ad929bcc KS |
868 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
869 | if (r < 0) | |
870 | return r; | |
871 | ||
70c949a4 | 872 | r = write_string_file_no_create(fs, ""); |
ad929bcc KS |
873 | if (r < 0) |
874 | return r; | |
875 | ||
ac9ef333 | 876 | return 0; |
ad929bcc KS |
877 | } |
878 | ||
8c6db833 | 879 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { |
7027ff61 | 880 | _cleanup_fclose_ FILE *f = NULL; |
c3175a7f | 881 | pid_t pid = 0, self_pid; |
c6c18be3 | 882 | bool found = false; |
7027ff61 | 883 | int r; |
8c6db833 | 884 | |
8c6db833 LP |
885 | assert(path); |
886 | ||
b043cd0b | 887 | r = cg_enumerate_processes(controller, path, &f); |
c3175a7f | 888 | if (r < 0) |
4c633005 | 889 | return r == -ENOENT ? 1 : r; |
8c6db833 | 890 | |
c3175a7f LP |
891 | self_pid = getpid(); |
892 | ||
c6c18be3 | 893 | while ((r = cg_read_pid(f, &pid)) > 0) { |
8c6db833 | 894 | |
c3175a7f | 895 | if (ignore_self && pid == self_pid) |
c6c18be3 | 896 | continue; |
8c6db833 | 897 | |
c6c18be3 LP |
898 | found = true; |
899 | break; | |
8c6db833 LP |
900 | } |
901 | ||
c6c18be3 LP |
902 | if (r < 0) |
903 | return r; | |
8c6db833 | 904 | |
c6c18be3 | 905 | return !found; |
8c6db833 LP |
906 | } |
907 | ||
908 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { | |
7027ff61 | 909 | _cleanup_closedir_ DIR *d = NULL; |
35d2e7ec | 910 | char *fn; |
7027ff61 | 911 | int r; |
8c6db833 | 912 | |
8c6db833 LP |
913 | assert(path); |
914 | ||
c3175a7f LP |
915 | r = cg_is_empty(controller, path, ignore_self); |
916 | if (r <= 0) | |
35d2e7ec LP |
917 | return r; |
918 | ||
c3175a7f LP |
919 | r = cg_enumerate_subgroups(controller, path, &d); |
920 | if (r < 0) | |
4c633005 | 921 | return r == -ENOENT ? 1 : r; |
8c6db833 | 922 | |
35d2e7ec | 923 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 924 | _cleanup_free_ char *p = NULL; |
8c6db833 | 925 | |
7027ff61 | 926 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 927 | free(fn); |
7027ff61 LP |
928 | if (!p) |
929 | return -ENOMEM; | |
8c6db833 | 930 | |
35d2e7ec | 931 | r = cg_is_empty_recursive(controller, p, ignore_self); |
35d2e7ec | 932 | if (r <= 0) |
7027ff61 | 933 | return r; |
35d2e7ec LP |
934 | } |
935 | ||
7027ff61 LP |
936 | if (r < 0) |
937 | return r; | |
35d2e7ec | 938 | |
7027ff61 | 939 | return 1; |
35d2e7ec LP |
940 | } |
941 | ||
942 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
943 | const char *e; | |
944 | char *t = NULL, *u = NULL; | |
5954c074 | 945 | _cleanup_free_ char *v = NULL; |
35d2e7ec LP |
946 | |
947 | assert(spec); | |
35d2e7ec LP |
948 | |
949 | if (*spec == '/') { | |
e884315e LP |
950 | if (!path_is_safe(spec)) |
951 | return -EINVAL; | |
35d2e7ec LP |
952 | |
953 | if (path) { | |
246aa6dd LP |
954 | t = strdup(spec); |
955 | if (!t) | |
35d2e7ec LP |
956 | return -ENOMEM; |
957 | ||
dbb9401d | 958 | *path = path_kill_slashes(t); |
8c6db833 LP |
959 | } |
960 | ||
35d2e7ec LP |
961 | if (controller) |
962 | *controller = NULL; | |
963 | ||
964 | return 0; | |
8c6db833 LP |
965 | } |
966 | ||
246aa6dd LP |
967 | e = strchr(spec, ':'); |
968 | if (!e) { | |
78edb35a | 969 | if (!cg_controller_is_valid(spec, true)) |
35d2e7ec LP |
970 | return -EINVAL; |
971 | ||
972 | if (controller) { | |
5954c074 | 973 | t = strdup(normalize_controller(spec)); |
246aa6dd | 974 | if (!t) |
35d2e7ec LP |
975 | return -ENOMEM; |
976 | ||
977 | *controller = t; | |
978 | } | |
979 | ||
980 | if (path) | |
981 | *path = NULL; | |
982 | ||
983 | return 0; | |
8c6db833 LP |
984 | } |
985 | ||
5954c074 LP |
986 | v = strndup(spec, e-spec); |
987 | if (!v) | |
988 | return -ENOMEM; | |
989 | t = strdup(normalize_controller(v)); | |
e884315e LP |
990 | if (!t) |
991 | return -ENOMEM; | |
78edb35a | 992 | if (!cg_controller_is_valid(t, true)) { |
e884315e | 993 | free(t); |
35d2e7ec | 994 | return -EINVAL; |
246aa6dd LP |
995 | } |
996 | ||
baa89da4 LP |
997 | if (streq(e+1, "")) { |
998 | u = strdup("/"); | |
999 | if (!u) { | |
1000 | free(t); | |
1001 | return -ENOMEM; | |
1002 | } | |
1003 | } else { | |
1004 | u = strdup(e+1); | |
1005 | if (!u) { | |
1006 | free(t); | |
1007 | return -ENOMEM; | |
1008 | } | |
35d2e7ec | 1009 | |
baa89da4 LP |
1010 | if (!path_is_safe(u) || |
1011 | !path_is_absolute(u)) { | |
1012 | free(t); | |
1013 | free(u); | |
1014 | return -EINVAL; | |
1015 | } | |
1016 | ||
1017 | path_kill_slashes(u); | |
1018 | } | |
5954c074 | 1019 | |
35d2e7ec LP |
1020 | if (controller) |
1021 | *controller = t; | |
e884315e LP |
1022 | else |
1023 | free(t); | |
35d2e7ec LP |
1024 | |
1025 | if (path) | |
1026 | *path = u; | |
e884315e LP |
1027 | else |
1028 | free(u); | |
35d2e7ec LP |
1029 | |
1030 | return 0; | |
8c6db833 | 1031 | } |
c6c18be3 | 1032 | |
7027ff61 | 1033 | int cg_mangle_path(const char *path, char **result) { |
78edb35a LP |
1034 | _cleanup_free_ char *c = NULL, *p = NULL; |
1035 | char *t; | |
35d2e7ec LP |
1036 | int r; |
1037 | ||
1038 | assert(path); | |
1039 | assert(result); | |
1040 | ||
73e231ab | 1041 | /* First, check if it already is a filesystem path */ |
7027ff61 | 1042 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 1043 | |
b69d29ce LP |
1044 | t = strdup(path); |
1045 | if (!t) | |
35d2e7ec LP |
1046 | return -ENOMEM; |
1047 | ||
dbb9401d | 1048 | *result = path_kill_slashes(t); |
35d2e7ec LP |
1049 | return 0; |
1050 | } | |
1051 | ||
73e231ab | 1052 | /* Otherwise, treat it as cg spec */ |
b69d29ce LP |
1053 | r = cg_split_spec(path, &c, &p); |
1054 | if (r < 0) | |
35d2e7ec LP |
1055 | return r; |
1056 | ||
78edb35a | 1057 | return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); |
35d2e7ec | 1058 | } |
1f73f0f1 | 1059 | |
7027ff61 | 1060 | int cg_get_root_path(char **path) { |
9444b1f2 | 1061 | char *p, *e; |
7027ff61 LP |
1062 | int r; |
1063 | ||
1064 | assert(path); | |
1065 | ||
9444b1f2 | 1066 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1067 | if (r < 0) |
1068 | return r; | |
1069 | ||
9444b1f2 LP |
1070 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); |
1071 | if (e) | |
7027ff61 LP |
1072 | *e = 0; |
1073 | ||
1f73f0f1 LP |
1074 | *path = p; |
1075 | return 0; | |
1076 | } | |
b59e2465 | 1077 | |
751bc6ac LP |
1078 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
1079 | _cleanup_free_ char *rt = NULL; | |
1080 | char *p; | |
ba1261bc LP |
1081 | int r; |
1082 | ||
e9174f29 | 1083 | assert(cgroup); |
751bc6ac | 1084 | assert(shifted); |
e9174f29 LP |
1085 | |
1086 | if (!root) { | |
1087 | /* If the root was specified let's use that, otherwise | |
1088 | * let's determine it from PID 1 */ | |
1089 | ||
751bc6ac | 1090 | r = cg_get_root_path(&rt); |
e9174f29 LP |
1091 | if (r < 0) |
1092 | return r; | |
1093 | ||
751bc6ac | 1094 | root = rt; |
e9174f29 | 1095 | } |
ba1261bc | 1096 | |
751bc6ac LP |
1097 | p = path_startswith(cgroup, root); |
1098 | if (p) | |
1099 | *shifted = p - 1; | |
1100 | else | |
1101 | *shifted = cgroup; | |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { | |
1107 | _cleanup_free_ char *raw = NULL; | |
1108 | const char *c; | |
1109 | int r; | |
1110 | ||
1111 | assert(pid >= 0); | |
1112 | assert(cgroup); | |
1113 | ||
1114 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
7027ff61 | 1115 | if (r < 0) |
ba1261bc | 1116 | return r; |
ba1261bc | 1117 | |
751bc6ac LP |
1118 | r = cg_shift_path(raw, root, &c); |
1119 | if (r < 0) | |
1120 | return r; | |
ba1261bc | 1121 | |
751bc6ac LP |
1122 | if (c == raw) { |
1123 | *cgroup = raw; | |
1124 | raw = NULL; | |
1125 | } else { | |
1126 | char *n; | |
ba1261bc | 1127 | |
751bc6ac LP |
1128 | n = strdup(c); |
1129 | if (!n) | |
ba1261bc | 1130 | return -ENOMEM; |
ba1261bc | 1131 | |
751bc6ac LP |
1132 | *cgroup = n; |
1133 | } | |
ba1261bc LP |
1134 | |
1135 | return 0; | |
1136 | } | |
1137 | ||
7027ff61 | 1138 | int cg_path_decode_unit(const char *cgroup, char **unit){ |
d7bd3de0 | 1139 | char *e, *c, *s; |
ef1673d1 MT |
1140 | |
1141 | assert(cgroup); | |
6c03089c | 1142 | assert(unit); |
ef1673d1 | 1143 | |
6c03089c LP |
1144 | e = strchrnul(cgroup, '/'); |
1145 | c = strndupa(cgroup, e - cgroup); | |
ae018d9b | 1146 | c = cg_unescape(c); |
ef1673d1 | 1147 | |
f78e6385 | 1148 | if (!unit_name_is_valid(c, TEMPLATE_INVALID)) |
6c03089c | 1149 | return -EINVAL; |
ef1673d1 | 1150 | |
d7bd3de0 | 1151 | s = strdup(c); |
6c03089c LP |
1152 | if (!s) |
1153 | return -ENOMEM; | |
1154 | ||
1155 | *unit = s; | |
ef1673d1 MT |
1156 | return 0; |
1157 | } | |
1158 | ||
9444b1f2 | 1159 | static const char *skip_slices(const char *p) { |
9444b1f2 LP |
1160 | /* Skips over all slice assignments */ |
1161 | ||
1162 | for (;;) { | |
1021b21b LP |
1163 | size_t n; |
1164 | ||
9444b1f2 LP |
1165 | p += strspn(p, "/"); |
1166 | ||
1167 | n = strcspn(p, "/"); | |
1168 | if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) | |
1169 | return p; | |
1170 | ||
1171 | p += n; | |
1172 | } | |
1173 | } | |
1174 | ||
6c03089c LP |
1175 | int cg_path_get_unit(const char *path, char **unit) { |
1176 | const char *e; | |
1177 | ||
1178 | assert(path); | |
1179 | assert(unit); | |
1180 | ||
9444b1f2 | 1181 | e = skip_slices(path); |
6c03089c | 1182 | |
7027ff61 | 1183 | return cg_path_decode_unit(e, unit); |
6c03089c LP |
1184 | } |
1185 | ||
1186 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
7fd1b19b | 1187 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1188 | int r; |
ba1261bc | 1189 | |
ef1673d1 MT |
1190 | assert(unit); |
1191 | ||
7027ff61 | 1192 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1193 | if (r < 0) |
1194 | return r; | |
1195 | ||
6c03089c LP |
1196 | return cg_path_get_unit(cgroup, unit); |
1197 | } | |
ef1673d1 | 1198 | |
d4fffc4b ZJS |
1199 | /** |
1200 | * Skip session-*.scope, but require it to be there. | |
1201 | */ | |
9444b1f2 LP |
1202 | static const char *skip_session(const char *p) { |
1203 | size_t n; | |
1204 | ||
1205 | assert(p); | |
1206 | ||
1207 | p += strspn(p, "/"); | |
1208 | ||
1209 | n = strcspn(p, "/"); | |
d4fffc4b ZJS |
1210 | if (n < strlen("session-x.scope") || memcmp(p, "session-", 8) != 0 || memcmp(p + n - 6, ".scope", 6) != 0) |
1211 | return NULL; | |
1212 | ||
1213 | p += n; | |
1214 | p += strspn(p, "/"); | |
1215 | ||
1216 | return p; | |
1217 | } | |
1218 | ||
1219 | /** | |
1220 | * Skip user@*.service, but require it to be there. | |
1221 | */ | |
1222 | static const char *skip_user_manager(const char *p) { | |
1223 | size_t n; | |
1224 | ||
1225 | assert(p); | |
1226 | ||
1227 | p += strspn(p, "/"); | |
1228 | ||
1229 | n = strcspn(p, "/"); | |
1230 | if (n < strlen("user@x.service") || memcmp(p, "user@", 5) != 0 || memcmp(p + n - 8, ".service", 8) != 0) | |
6c03089c | 1231 | return NULL; |
ef1673d1 | 1232 | |
9444b1f2 LP |
1233 | p += n; |
1234 | p += strspn(p, "/"); | |
1235 | ||
1236 | return p; | |
1237 | } | |
1238 | ||
6c03089c | 1239 | int cg_path_get_user_unit(const char *path, char **unit) { |
d4fffc4b | 1240 | const char *e, *t; |
ef1673d1 | 1241 | |
6c03089c | 1242 | assert(path); |
ba1261bc LP |
1243 | assert(unit); |
1244 | ||
6c03089c LP |
1245 | /* We always have to parse the path from the beginning as unit |
1246 | * cgroups might have arbitrary child cgroups and we shouldn't get | |
1247 | * confused by those */ | |
ba1261bc | 1248 | |
9444b1f2 LP |
1249 | /* Skip slices, if there are any */ |
1250 | e = skip_slices(path); | |
ba1261bc | 1251 | |
d4fffc4b ZJS |
1252 | /* Skip the session scope... */ |
1253 | t = skip_session(e); | |
1254 | if (t) | |
1255 | /* ... and skip more slices if there's one */ | |
1256 | e = skip_slices(t); | |
1257 | else { | |
1258 | /* ... or require a user manager unit to be there */ | |
1259 | e = skip_user_manager(e); | |
1260 | if (!e) | |
1261 | return -ENOENT; | |
1262 | } | |
6c03089c | 1263 | |
7027ff61 | 1264 | return cg_path_decode_unit(e, unit); |
ef1673d1 | 1265 | } |
ba1261bc | 1266 | |
ef1673d1 | 1267 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
7fd1b19b | 1268 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1269 | int r; |
1270 | ||
1271 | assert(unit); | |
1272 | ||
7027ff61 | 1273 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1274 | if (r < 0) |
1275 | return r; | |
1276 | ||
1277 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1278 | } |
e884315e | 1279 | |
7027ff61 | 1280 | int cg_path_get_machine_name(const char *path, char **machine) { |
89f7c846 LP |
1281 | _cleanup_free_ char *u = NULL, *sl = NULL; |
1282 | int r; | |
374ec6ab | 1283 | |
89f7c846 LP |
1284 | r = cg_path_get_unit(path, &u); |
1285 | if (r < 0) | |
1286 | return r; | |
7027ff61 | 1287 | |
89f7c846 LP |
1288 | sl = strjoin("/run/systemd/machines/unit:", u, NULL); |
1289 | if (!sl) | |
ae018d9b | 1290 | return -ENOMEM; |
aff38e74 | 1291 | |
89f7c846 | 1292 | return readlink_malloc(sl, machine); |
7027ff61 LP |
1293 | } |
1294 | ||
1295 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
7fd1b19b | 1296 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1297 | int r; |
1298 | ||
1299 | assert(machine); | |
1300 | ||
1301 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1302 | if (r < 0) | |
1303 | return r; | |
1304 | ||
1305 | return cg_path_get_machine_name(cgroup, machine); | |
1306 | } | |
1307 | ||
1308 | int cg_path_get_session(const char *path, char **session) { | |
a13ee4c7 | 1309 | const char *e, *n, *x, *y; |
af08d2f9 | 1310 | char *s; |
7027ff61 LP |
1311 | |
1312 | assert(path); | |
7027ff61 | 1313 | |
9444b1f2 LP |
1314 | /* Skip slices, if there are any */ |
1315 | e = skip_slices(path); | |
7027ff61 | 1316 | |
7027ff61 | 1317 | n = strchrnul(e, '/'); |
374ec6ab | 1318 | if (e == n) |
7027ff61 | 1319 | return -ENOENT; |
374ec6ab LP |
1320 | |
1321 | s = strndupa(e, n - e); | |
1322 | s = cg_unescape(s); | |
1323 | ||
1324 | x = startswith(s, "session-"); | |
1325 | if (!x) | |
1326 | return -ENOENT; | |
a13ee4c7 ZJS |
1327 | y = endswith(x, ".scope"); |
1328 | if (!y || x == y) | |
374ec6ab LP |
1329 | return -ENOENT; |
1330 | ||
af08d2f9 LP |
1331 | if (session) { |
1332 | char *r; | |
1333 | ||
a13ee4c7 | 1334 | r = strndup(x, y - x); |
af08d2f9 LP |
1335 | if (!r) |
1336 | return -ENOMEM; | |
1337 | ||
1338 | *session = r; | |
1339 | } | |
7027ff61 | 1340 | |
7027ff61 LP |
1341 | return 0; |
1342 | } | |
1343 | ||
1344 | int cg_pid_get_session(pid_t pid, char **session) { | |
7fd1b19b | 1345 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1346 | int r; |
1347 | ||
7027ff61 LP |
1348 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1349 | if (r < 0) | |
1350 | return r; | |
1351 | ||
1352 | return cg_path_get_session(cgroup, session); | |
1353 | } | |
1354 | ||
ae018d9b | 1355 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
374ec6ab | 1356 | _cleanup_free_ char *slice = NULL; |
674eb685 | 1357 | const char *start, *end; |
ae018d9b | 1358 | char *s; |
674eb685 | 1359 | uid_t u; |
374ec6ab | 1360 | int r; |
ae018d9b LP |
1361 | |
1362 | assert(path); | |
ae018d9b | 1363 | |
374ec6ab LP |
1364 | r = cg_path_get_slice(path, &slice); |
1365 | if (r < 0) | |
1366 | return r; | |
ae018d9b | 1367 | |
674eb685 LP |
1368 | start = startswith(slice, "user-"); |
1369 | if (!start) | |
ae018d9b | 1370 | return -ENOENT; |
674eb685 LP |
1371 | end = endswith(slice, ".slice"); |
1372 | if (!end) | |
ae018d9b LP |
1373 | return -ENOENT; |
1374 | ||
674eb685 | 1375 | s = strndupa(start, end - start); |
ae018d9b | 1376 | if (!s) |
674eb685 | 1377 | return -ENOENT; |
ae018d9b | 1378 | |
674eb685 LP |
1379 | if (parse_uid(s, &u) < 0) |
1380 | return -EIO; | |
1381 | ||
1382 | if (uid) | |
1383 | *uid = u; | |
1384 | ||
1385 | return 0; | |
ae018d9b LP |
1386 | } |
1387 | ||
1388 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1389 | _cleanup_free_ char *cgroup = NULL; | |
1390 | int r; | |
1391 | ||
ae018d9b LP |
1392 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1393 | if (r < 0) | |
1394 | return r; | |
1395 | ||
1396 | return cg_path_get_owner_uid(cgroup, uid); | |
1397 | } | |
1398 | ||
1021b21b LP |
1399 | int cg_path_get_slice(const char *p, char **slice) { |
1400 | const char *e = NULL; | |
1401 | size_t m = 0; | |
1402 | ||
1403 | assert(p); | |
1404 | assert(slice); | |
1405 | ||
1406 | for (;;) { | |
1407 | size_t n; | |
1408 | ||
1409 | p += strspn(p, "/"); | |
1410 | ||
1411 | n = strcspn(p, "/"); | |
1412 | if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) { | |
1413 | char *s; | |
1414 | ||
1415 | if (!e) | |
1416 | return -ENOENT; | |
1417 | ||
1418 | s = strndup(e, m); | |
1419 | if (!s) | |
1420 | return -ENOMEM; | |
1421 | ||
1422 | *slice = s; | |
1423 | return 0; | |
1424 | } | |
1425 | ||
1426 | e = p; | |
1427 | m = n; | |
1428 | ||
1429 | p += n; | |
1430 | } | |
1431 | } | |
1432 | ||
1433 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1434 | _cleanup_free_ char *cgroup = NULL; | |
1435 | int r; | |
1436 | ||
1437 | assert(slice); | |
1438 | ||
1439 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1440 | if (r < 0) | |
1441 | return r; | |
1442 | ||
1443 | return cg_path_get_slice(cgroup, slice); | |
1444 | } | |
1445 | ||
ae018d9b LP |
1446 | char *cg_escape(const char *p) { |
1447 | bool need_prefix = false; | |
1448 | ||
1449 | /* This implements very minimal escaping for names to be used | |
1450 | * as file names in the cgroup tree: any name which might | |
1451 | * conflict with a kernel name or is prefixed with '_' is | |
1452 | * prefixed with a '_'. That way, when reading cgroup names it | |
1453 | * is sufficient to remove a single prefixing underscore if | |
1454 | * there is one. */ | |
1455 | ||
1456 | /* The return value of this function (unlike cg_unescape()) | |
1457 | * needs free()! */ | |
1458 | ||
a0ab5665 LP |
1459 | if (p[0] == 0 || |
1460 | p[0] == '_' || | |
1461 | p[0] == '.' || | |
1462 | streq(p, "notify_on_release") || | |
1463 | streq(p, "release_agent") || | |
1464 | streq(p, "tasks")) | |
ae018d9b LP |
1465 | need_prefix = true; |
1466 | else { | |
1467 | const char *dot; | |
1468 | ||
1469 | dot = strrchr(p, '.'); | |
1470 | if (dot) { | |
1471 | ||
1472 | if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0) | |
1473 | need_prefix = true; | |
1474 | else { | |
1475 | char *n; | |
1476 | ||
1477 | n = strndupa(p, dot - p); | |
1478 | ||
1479 | if (check_hierarchy(n) >= 0) | |
1480 | need_prefix = true; | |
1481 | } | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | if (need_prefix) | |
1486 | return strappend("_", p); | |
1487 | else | |
1488 | return strdup(p); | |
1489 | } | |
1490 | ||
1491 | char *cg_unescape(const char *p) { | |
1492 | assert(p); | |
1493 | ||
1494 | /* The return value of this function (unlike cg_escape()) | |
1495 | * doesn't need free()! */ | |
1496 | ||
1497 | if (p[0] == '_') | |
1498 | return (char*) p+1; | |
1499 | ||
1500 | return (char*) p; | |
1501 | } | |
78edb35a LP |
1502 | |
1503 | #define CONTROLLER_VALID \ | |
4b549144 | 1504 | DIGITS LETTERS \ |
78edb35a LP |
1505 | "_" |
1506 | ||
1507 | bool cg_controller_is_valid(const char *p, bool allow_named) { | |
1508 | const char *t, *s; | |
1509 | ||
1510 | if (!p) | |
1511 | return false; | |
1512 | ||
1513 | if (allow_named) { | |
1514 | s = startswith(p, "name="); | |
1515 | if (s) | |
1516 | p = s; | |
1517 | } | |
1518 | ||
1519 | if (*p == 0 || *p == '_') | |
1520 | return false; | |
1521 | ||
1522 | for (t = p; *t; t++) | |
1523 | if (!strchr(CONTROLLER_VALID, *t)) | |
1524 | return false; | |
1525 | ||
1526 | if (t - p > FILENAME_MAX) | |
1527 | return false; | |
1528 | ||
1529 | return true; | |
1530 | } | |
a016b922 LP |
1531 | |
1532 | int cg_slice_to_path(const char *unit, char **ret) { | |
1533 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1534 | const char *dash; | |
1535 | ||
1536 | assert(unit); | |
1537 | assert(ret); | |
1538 | ||
f78e6385 | 1539 | if (!unit_name_is_valid(unit, TEMPLATE_INVALID)) |
a016b922 LP |
1540 | return -EINVAL; |
1541 | ||
1542 | if (!endswith(unit, ".slice")) | |
1543 | return -EINVAL; | |
1544 | ||
1545 | p = unit_name_to_prefix(unit); | |
1546 | if (!p) | |
1547 | return -ENOMEM; | |
1548 | ||
1549 | dash = strchr(p, '-'); | |
1550 | while (dash) { | |
1551 | _cleanup_free_ char *escaped = NULL; | |
1552 | char n[dash - p + sizeof(".slice")]; | |
1553 | ||
1554 | strcpy(stpncpy(n, p, dash - p), ".slice"); | |
1555 | ||
f78e6385 | 1556 | if (!unit_name_is_valid(n, TEMPLATE_INVALID)) |
a016b922 LP |
1557 | return -EINVAL; |
1558 | ||
1559 | escaped = cg_escape(n); | |
1560 | if (!escaped) | |
1561 | return -ENOMEM; | |
1562 | ||
1563 | if (!strextend(&s, escaped, "/", NULL)) | |
1564 | return -ENOMEM; | |
1565 | ||
1566 | dash = strchr(dash+1, '-'); | |
1567 | } | |
1568 | ||
1569 | e = cg_escape(unit); | |
1570 | if (!e) | |
1571 | return -ENOMEM; | |
1572 | ||
1573 | if (!strextend(&s, e, NULL)) | |
1574 | return -ENOMEM; | |
1575 | ||
1576 | *ret = s; | |
1577 | s = NULL; | |
1578 | ||
1579 | return 0; | |
1580 | } | |
4ad49000 LP |
1581 | |
1582 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
1583 | _cleanup_free_ char *p = NULL; | |
1584 | int r; | |
1585 | ||
1586 | r = cg_get_path(controller, path, attribute, &p); | |
1587 | if (r < 0) | |
1588 | return r; | |
1589 | ||
70c949a4 | 1590 | return write_string_file_no_create(p, value); |
4ad49000 LP |
1591 | } |
1592 | ||
1593 | static const char mask_names[] = | |
1594 | "cpu\0" | |
1595 | "cpuacct\0" | |
1596 | "blkio\0" | |
1597 | "memory\0" | |
1598 | "devices\0"; | |
1599 | ||
13b84ec7 | 1600 | int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) { |
4ad49000 LP |
1601 | CGroupControllerMask bit = 1; |
1602 | const char *n; | |
1603 | int r; | |
1604 | ||
1605 | /* This one will create a cgroup in our private tree, but also | |
1606 | * duplicate it in the trees specified in mask, and remove it | |
1607 | * in all others */ | |
1608 | ||
1609 | /* First create the cgroup in our own hierarchy. */ | |
1610 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
1611 | if (r < 0) | |
1612 | return r; | |
1613 | ||
1614 | /* Then, do the same in the other hierarchies */ | |
1615 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 | 1616 | if (mask & bit) |
4ad49000 | 1617 | cg_create(n, path); |
13b84ec7 | 1618 | else if (supported & bit) |
4ad49000 LP |
1619 | cg_trim(n, path, true); |
1620 | ||
1621 | bit <<= 1; | |
1622 | } | |
1623 | ||
13b84ec7 | 1624 | return 0; |
4ad49000 LP |
1625 | } |
1626 | ||
13b84ec7 | 1627 | int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid) { |
4ad49000 LP |
1628 | CGroupControllerMask bit = 1; |
1629 | const char *n; | |
1630 | int r; | |
1631 | ||
1632 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
13b84ec7 LP |
1633 | if (r < 0) |
1634 | return r; | |
4ad49000 LP |
1635 | |
1636 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 LP |
1637 | if (supported & bit) |
1638 | cg_attach_fallback(n, path, pid); | |
4ad49000 LP |
1639 | |
1640 | bit <<= 1; | |
1641 | } | |
1642 | ||
13b84ec7 | 1643 | return 0; |
4ad49000 LP |
1644 | } |
1645 | ||
13b84ec7 | 1646 | int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids) { |
6c12b52e LP |
1647 | Iterator i; |
1648 | void *pidp; | |
1649 | int r = 0; | |
1650 | ||
1651 | SET_FOREACH(pidp, pids, i) { | |
1652 | pid_t pid = PTR_TO_LONG(pidp); | |
13b84ec7 | 1653 | int q; |
6c12b52e | 1654 | |
13b84ec7 LP |
1655 | q = cg_attach_everywhere(supported, path, pid); |
1656 | if (q < 0) | |
1657 | r = q; | |
6c12b52e LP |
1658 | } |
1659 | ||
1660 | return r; | |
1661 | } | |
1662 | ||
03b90d4b | 1663 | int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
4ad49000 LP |
1664 | CGroupControllerMask bit = 1; |
1665 | const char *n; | |
1666 | int r; | |
1667 | ||
13b84ec7 LP |
1668 | if (!path_equal(from, to)) { |
1669 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true); | |
1670 | if (r < 0) | |
1671 | return r; | |
1672 | } | |
4ad49000 LP |
1673 | |
1674 | NULSTR_FOREACH(n, mask_names) { | |
03b90d4b LP |
1675 | if (supported & bit) { |
1676 | const char *p = NULL; | |
1677 | ||
1678 | if (to_callback) | |
1679 | p = to_callback(bit, userdata); | |
1680 | ||
1681 | if (!p) | |
1682 | p = to; | |
1683 | ||
1684 | cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false); | |
1685 | } | |
4ad49000 LP |
1686 | |
1687 | bit <<= 1; | |
1688 | } | |
1689 | ||
13b84ec7 | 1690 | return 0; |
4ad49000 LP |
1691 | } |
1692 | ||
13b84ec7 | 1693 | int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) { |
4ad49000 LP |
1694 | CGroupControllerMask bit = 1; |
1695 | const char *n; | |
1696 | int r; | |
1697 | ||
1698 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
1699 | if (r < 0) | |
1700 | return r; | |
1701 | ||
1702 | NULSTR_FOREACH(n, mask_names) { | |
13b84ec7 | 1703 | if (supported & bit) |
4ad49000 LP |
1704 | cg_trim(n, path, delete_root); |
1705 | ||
1706 | bit <<= 1; | |
1707 | } | |
1708 | ||
13b84ec7 | 1709 | return 0; |
4ad49000 LP |
1710 | } |
1711 | ||
1712 | CGroupControllerMask cg_mask_supported(void) { | |
1713 | CGroupControllerMask bit = 1, mask = 0; | |
1714 | const char *n; | |
1715 | ||
1716 | NULSTR_FOREACH(n, mask_names) { | |
1717 | if (check_hierarchy(n) >= 0) | |
1718 | mask |= bit; | |
1719 | ||
1720 | bit <<= 1; | |
1721 | } | |
1722 | ||
1723 | return mask; | |
1724 | } |