]>
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" |
8c6db833 | 41 | |
c6c18be3 | 42 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
7027ff61 | 43 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 44 | FILE *f; |
7027ff61 | 45 | int r; |
c6c18be3 | 46 | |
c6c18be3 LP |
47 | assert(_f); |
48 | ||
c3175a7f LP |
49 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
50 | if (r < 0) | |
c6c18be3 LP |
51 | return r; |
52 | ||
53 | f = fopen(fs, "re"); | |
c6c18be3 LP |
54 | if (!f) |
55 | return -errno; | |
56 | ||
57 | *_f = f; | |
58 | return 0; | |
59 | } | |
60 | ||
61 | int cg_enumerate_tasks(const char *controller, const char *path, FILE **_f) { | |
7027ff61 | 62 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 63 | FILE *f; |
7027ff61 | 64 | int r; |
c6c18be3 | 65 | |
c6c18be3 LP |
66 | assert(_f); |
67 | ||
c3175a7f LP |
68 | r = cg_get_path(controller, path, "tasks", &fs); |
69 | if (r < 0) | |
c6c18be3 LP |
70 | return r; |
71 | ||
72 | f = fopen(fs, "re"); | |
c6c18be3 LP |
73 | if (!f) |
74 | return -errno; | |
75 | ||
76 | *_f = f; | |
77 | return 0; | |
78 | } | |
79 | ||
80 | int cg_read_pid(FILE *f, pid_t *_pid) { | |
81 | unsigned long ul; | |
82 | ||
83 | /* Note that the cgroup.procs might contain duplicates! See | |
84 | * cgroups.txt for details. */ | |
85 | ||
7027ff61 LP |
86 | assert(f); |
87 | assert(_pid); | |
88 | ||
c6c18be3 LP |
89 | errno = 0; |
90 | if (fscanf(f, "%lu", &ul) != 1) { | |
91 | ||
92 | if (feof(f)) | |
93 | return 0; | |
94 | ||
95 | return errno ? -errno : -EIO; | |
96 | } | |
97 | ||
98 | if (ul <= 0) | |
99 | return -EIO; | |
100 | ||
101 | *_pid = (pid_t) ul; | |
102 | return 1; | |
103 | } | |
104 | ||
35d2e7ec | 105 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
7027ff61 | 106 | _cleanup_free_ char *fs = NULL; |
35d2e7ec LP |
107 | int r; |
108 | DIR *d; | |
109 | ||
35d2e7ec LP |
110 | assert(_d); |
111 | ||
112 | /* This is not recursive! */ | |
113 | ||
c3175a7f LP |
114 | r = cg_get_path(controller, path, NULL, &fs); |
115 | if (r < 0) | |
35d2e7ec LP |
116 | return r; |
117 | ||
118 | d = opendir(fs); | |
35d2e7ec LP |
119 | if (!d) |
120 | return -errno; | |
121 | ||
122 | *_d = d; | |
123 | return 0; | |
124 | } | |
125 | ||
126 | int cg_read_subgroup(DIR *d, char **fn) { | |
127 | struct dirent *de; | |
128 | ||
129 | assert(d); | |
7027ff61 | 130 | assert(fn); |
35d2e7ec | 131 | |
7027ff61 | 132 | FOREACH_DIRENT(de, d, return -errno) { |
35d2e7ec LP |
133 | char *b; |
134 | ||
135 | if (de->d_type != DT_DIR) | |
136 | continue; | |
137 | ||
138 | if (streq(de->d_name, ".") || | |
139 | streq(de->d_name, "..")) | |
140 | continue; | |
141 | ||
7027ff61 LP |
142 | b = strdup(de->d_name); |
143 | if (!b) | |
35d2e7ec LP |
144 | return -ENOMEM; |
145 | ||
146 | *fn = b; | |
147 | return 1; | |
148 | } | |
149 | ||
35d2e7ec LP |
150 | return 0; |
151 | } | |
152 | ||
ad293f5a | 153 | int cg_rmdir(const char *controller, const char *path, bool honour_sticky) { |
7027ff61 | 154 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
155 | int r; |
156 | ||
ad293f5a LP |
157 | r = cg_get_path(controller, path, NULL, &p); |
158 | if (r < 0) | |
35d2e7ec LP |
159 | return r; |
160 | ||
ad293f5a LP |
161 | if (honour_sticky) { |
162 | char *tasks; | |
163 | ||
164 | /* If the sticky bit is set don't remove the directory */ | |
165 | ||
166 | tasks = strappend(p, "/tasks"); | |
7027ff61 | 167 | if (!tasks) |
ad293f5a | 168 | return -ENOMEM; |
ad293f5a | 169 | |
8d53b453 | 170 | r = file_is_priv_sticky(tasks); |
ad293f5a LP |
171 | free(tasks); |
172 | ||
7027ff61 | 173 | if (r > 0) |
ad293f5a | 174 | return 0; |
ad293f5a LP |
175 | } |
176 | ||
35d2e7ec | 177 | r = rmdir(p); |
7027ff61 LP |
178 | if (r < 0 && errno != ENOENT) |
179 | return -errno; | |
35d2e7ec | 180 | |
7027ff61 | 181 | return 0; |
35d2e7ec LP |
182 | } |
183 | ||
430c18ed | 184 | int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { |
7027ff61 | 185 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 186 | bool done = false; |
8c6db833 | 187 | int r, ret = 0; |
35d2e7ec | 188 | pid_t my_pid; |
8c6db833 | 189 | |
8c6db833 LP |
190 | assert(sig >= 0); |
191 | ||
192 | /* This goes through the tasks list and kills them all. This | |
193 | * is repeated until no further processes are added to the | |
194 | * tasks list, to properly handle forking processes */ | |
195 | ||
7027ff61 LP |
196 | if (!s) { |
197 | s = allocated_set = set_new(trivial_hash_func, trivial_compare_func); | |
198 | if (!s) | |
ca949c9d | 199 | return -ENOMEM; |
7027ff61 | 200 | } |
8c6db833 LP |
201 | |
202 | my_pid = getpid(); | |
203 | ||
204 | do { | |
7027ff61 | 205 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 206 | pid_t pid = 0; |
8c6db833 LP |
207 | done = true; |
208 | ||
7027ff61 LP |
209 | r = cg_enumerate_processes(controller, path, &f); |
210 | if (r < 0) { | |
4c633005 | 211 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 212 | return r; |
35d2e7ec | 213 | |
7027ff61 | 214 | return ret; |
35d2e7ec | 215 | } |
c6c18be3 LP |
216 | |
217 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 218 | |
7027ff61 | 219 | if (ignore_self && pid == my_pid) |
c6c18be3 | 220 | continue; |
8c6db833 | 221 | |
c6c18be3 LP |
222 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
223 | continue; | |
8c6db833 LP |
224 | |
225 | /* If we haven't killed this process yet, kill | |
226 | * it */ | |
4c633005 LP |
227 | if (kill(pid, sig) < 0) { |
228 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 229 | ret = -errno; |
430c18ed LP |
230 | } else if (ret == 0) { |
231 | ||
232 | if (sigcont) | |
233 | kill(pid, SIGCONT); | |
234 | ||
35d2e7ec | 235 | ret = 1; |
430c18ed | 236 | } |
8c6db833 | 237 | |
8c6db833 LP |
238 | done = false; |
239 | ||
7027ff61 LP |
240 | r = set_put(s, LONG_TO_PTR(pid)); |
241 | if (r < 0) { | |
35d2e7ec | 242 | if (ret >= 0) |
7027ff61 | 243 | return r; |
35d2e7ec | 244 | |
7027ff61 | 245 | return ret; |
35d2e7ec LP |
246 | } |
247 | } | |
248 | ||
249 | if (r < 0) { | |
250 | if (ret >= 0) | |
7027ff61 | 251 | return r; |
35d2e7ec | 252 | |
7027ff61 | 253 | return ret; |
8c6db833 LP |
254 | } |
255 | ||
8c6db833 LP |
256 | /* To avoid racing against processes which fork |
257 | * quicker than we can kill them we repeat this until | |
258 | * no new pids need to be killed. */ | |
259 | ||
35d2e7ec | 260 | } while (!done); |
8c6db833 | 261 | |
35d2e7ec | 262 | return ret; |
8c6db833 LP |
263 | } |
264 | ||
430c18ed | 265 | int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { |
7027ff61 LP |
266 | _cleanup_set_free_ Set *allocated_set = NULL; |
267 | _cleanup_closedir_ DIR *d = NULL; | |
35d2e7ec | 268 | int r, ret = 0; |
35d2e7ec | 269 | char *fn; |
8c6db833 LP |
270 | |
271 | assert(path); | |
8c6db833 LP |
272 | assert(sig >= 0); |
273 | ||
7027ff61 LP |
274 | if (!s) { |
275 | s = allocated_set = set_new(trivial_hash_func, trivial_compare_func); | |
276 | if (!s) | |
ca949c9d | 277 | return -ENOMEM; |
7027ff61 | 278 | } |
ca949c9d | 279 | |
430c18ed | 280 | ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); |
8c6db833 | 281 | |
7027ff61 LP |
282 | r = cg_enumerate_subgroups(controller, path, &d); |
283 | if (r < 0) { | |
4c633005 | 284 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 285 | return r; |
8c6db833 | 286 | |
7027ff61 | 287 | return ret; |
35d2e7ec | 288 | } |
8c6db833 | 289 | |
35d2e7ec | 290 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 291 | _cleanup_free_ char *p = NULL; |
8c6db833 | 292 | |
7027ff61 | 293 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 294 | free(fn); |
7027ff61 LP |
295 | if (!p) |
296 | return -ENOMEM; | |
8c6db833 | 297 | |
430c18ed | 298 | r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); |
7027ff61 | 299 | if (ret >= 0 && r != 0) |
35d2e7ec | 300 | ret = r; |
8c6db833 LP |
301 | } |
302 | ||
7027ff61 | 303 | if (ret >= 0 && r < 0) |
35d2e7ec LP |
304 | ret = r; |
305 | ||
7027ff61 LP |
306 | if (rem) { |
307 | r = cg_rmdir(controller, path, true); | |
308 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) | |
309 | return r; | |
310 | } | |
ca949c9d | 311 | |
8c6db833 LP |
312 | return ret; |
313 | } | |
314 | ||
35d2e7ec | 315 | int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) { |
8c6db833 LP |
316 | unsigned i; |
317 | ||
318 | assert(path); | |
8c6db833 LP |
319 | |
320 | /* This safely kills all processes; first it sends a SIGTERM, | |
9f452741 LP |
321 | * then checks 8 times after 200ms whether the group is now |
322 | * empty, then kills everything that is left with SIGKILL and | |
323 | * finally checks 5 times after 200ms each whether the group | |
324 | * is finally empty. */ | |
8c6db833 | 325 | |
9f452741 | 326 | for (i = 0; i < 15; i++) { |
1d0ae74a | 327 | int sig, r; |
8c6db833 LP |
328 | |
329 | if (i <= 0) | |
330 | sig = SIGTERM; | |
9f452741 | 331 | else if (i == 9) |
8c6db833 LP |
332 | sig = SIGKILL; |
333 | else | |
334 | sig = 0; | |
335 | ||
7027ff61 LP |
336 | r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL); |
337 | if (r <= 0) | |
8c6db833 LP |
338 | return r; |
339 | ||
9f452741 | 340 | usleep(200 * USEC_PER_MSEC); |
8c6db833 LP |
341 | } |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
246aa6dd | 346 | int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) { |
35d2e7ec | 347 | bool done = false; |
246aa6dd | 348 | _cleanup_set_free_ Set *s = NULL; |
8c6db833 LP |
349 | int r, ret = 0; |
350 | pid_t my_pid; | |
351 | ||
246aa6dd LP |
352 | assert(cfrom); |
353 | assert(pfrom); | |
354 | assert(cto); | |
355 | assert(pto); | |
8c6db833 | 356 | |
246aa6dd LP |
357 | s = set_new(trivial_hash_func, trivial_compare_func); |
358 | if (!s) | |
35d2e7ec LP |
359 | return -ENOMEM; |
360 | ||
8c6db833 LP |
361 | my_pid = getpid(); |
362 | ||
363 | do { | |
7027ff61 | 364 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 365 | pid_t pid = 0; |
8c6db833 LP |
366 | done = true; |
367 | ||
246aa6dd LP |
368 | r = cg_enumerate_tasks(cfrom, pfrom, &f); |
369 | if (r < 0) { | |
4c633005 | 370 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 371 | return r; |
35d2e7ec | 372 | |
246aa6dd | 373 | return ret; |
35d2e7ec | 374 | } |
c6c18be3 LP |
375 | |
376 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 377 | |
35d2e7ec LP |
378 | /* This might do weird stuff if we aren't a |
379 | * single-threaded program. However, we | |
380 | * luckily know we are not */ | |
7027ff61 | 381 | if (ignore_self && pid == my_pid) |
c6c18be3 | 382 | continue; |
8c6db833 | 383 | |
35d2e7ec LP |
384 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
385 | continue; | |
386 | ||
246aa6dd LP |
387 | r = cg_attach(cto, pto, pid); |
388 | if (r < 0) { | |
4c633005 | 389 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
390 | ret = r; |
391 | } else if (ret == 0) | |
392 | ret = 1; | |
8c6db833 | 393 | |
8c6db833 | 394 | done = false; |
35d2e7ec | 395 | |
246aa6dd LP |
396 | r = set_put(s, LONG_TO_PTR(pid)); |
397 | if (r < 0) { | |
35d2e7ec | 398 | if (ret >= 0) |
7027ff61 | 399 | return r; |
35d2e7ec | 400 | |
246aa6dd | 401 | return ret; |
35d2e7ec LP |
402 | } |
403 | } | |
404 | ||
405 | if (r < 0) { | |
406 | if (ret >= 0) | |
7027ff61 | 407 | return r; |
35d2e7ec | 408 | |
246aa6dd | 409 | return ret; |
8c6db833 | 410 | } |
35d2e7ec | 411 | } while (!done); |
8c6db833 | 412 | |
35d2e7ec | 413 | return ret; |
8c6db833 LP |
414 | } |
415 | ||
246aa6dd | 416 | int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self, bool rem) { |
246aa6dd | 417 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 418 | int r, ret = 0; |
35d2e7ec | 419 | char *fn; |
8c6db833 | 420 | |
246aa6dd LP |
421 | assert(cfrom); |
422 | assert(pfrom); | |
423 | assert(cto); | |
424 | assert(pto); | |
8c6db833 | 425 | |
246aa6dd | 426 | ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self); |
8c6db833 | 427 | |
246aa6dd LP |
428 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
429 | if (r < 0) { | |
4c633005 | 430 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
431 | return r; |
432 | ||
246aa6dd | 433 | return ret; |
35d2e7ec LP |
434 | } |
435 | ||
436 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 437 | _cleanup_free_ char *p = NULL; |
8c6db833 | 438 | |
246aa6dd | 439 | p = strjoin(pfrom, "/", fn, NULL); |
35d2e7ec | 440 | free(fn); |
246aa6dd | 441 | if (!p) { |
35d2e7ec | 442 | if (ret >= 0) |
7027ff61 | 443 | return -ENOMEM; |
35d2e7ec | 444 | |
246aa6dd | 445 | return ret; |
8c6db833 LP |
446 | } |
447 | ||
246aa6dd | 448 | r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem); |
35d2e7ec LP |
449 | if (r != 0 && ret >= 0) |
450 | ret = r; | |
8c6db833 LP |
451 | } |
452 | ||
35d2e7ec LP |
453 | if (r < 0 && ret >= 0) |
454 | ret = r; | |
455 | ||
246aa6dd LP |
456 | if (rem) { |
457 | r = cg_rmdir(cfrom, pfrom, true); | |
458 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) | |
459 | return r; | |
460 | } | |
8c6db833 LP |
461 | |
462 | return ret; | |
463 | } | |
464 | ||
3474ae3c LP |
465 | static const char *normalize_controller(const char *controller) { |
466 | ||
7027ff61 LP |
467 | assert(controller); |
468 | ||
3474ae3c LP |
469 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
470 | return "systemd"; | |
471 | else if (startswith(controller, "name=")) | |
472 | return controller + 5; | |
473 | else | |
474 | return controller; | |
475 | } | |
476 | ||
477 | static int join_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
018ef268 | 478 | char *t = NULL; |
3474ae3c | 479 | |
c3175a7f LP |
480 | if (controller) { |
481 | if (path && suffix) | |
b7def684 | 482 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL); |
c3175a7f | 483 | else if (path) |
b7def684 | 484 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL); |
c3175a7f | 485 | else if (suffix) |
b7def684 | 486 | t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL); |
c3175a7f | 487 | else |
7027ff61 | 488 | t = strappend("/sys/fs/cgroup/", controller); |
c3175a7f LP |
489 | } else { |
490 | if (path && suffix) | |
b7def684 | 491 | t = strjoin(path, "/", suffix, NULL); |
c3175a7f LP |
492 | else if (path) |
493 | t = strdup(path); | |
7027ff61 LP |
494 | else |
495 | return -EINVAL; | |
c3175a7f | 496 | } |
3474ae3c LP |
497 | |
498 | if (!t) | |
499 | return -ENOMEM; | |
500 | ||
501 | path_kill_slashes(t); | |
502 | ||
503 | *fs = t; | |
504 | return 0; | |
505 | } | |
506 | ||
8c6db833 | 507 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
dbd821ac | 508 | const char *p; |
0ac10822 | 509 | static __thread bool good = false; |
8c6db833 | 510 | |
dbd821ac LP |
511 | assert(fs); |
512 | ||
3bfc7184 | 513 | if (_unlikely_(!good)) { |
70132bd0 LP |
514 | int r; |
515 | ||
0c85a4f3 | 516 | r = path_is_mount_point("/sys/fs/cgroup", false); |
70132bd0 LP |
517 | if (r <= 0) |
518 | return r < 0 ? r : -ENOENT; | |
519 | ||
520 | /* Cache this to save a few stat()s */ | |
521 | good = true; | |
522 | } | |
523 | ||
c3175a7f | 524 | p = controller ? normalize_controller(controller) : NULL; |
7027ff61 | 525 | |
3474ae3c LP |
526 | return join_path(p, path, suffix, fs); |
527 | } | |
dbd821ac | 528 | |
7027ff61 | 529 | static int check_hierarchy(const char *p) { |
37099707 LP |
530 | char *cc; |
531 | ||
532 | assert(p); | |
533 | ||
534 | /* Check if this controller actually really exists */ | |
535 | cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p)); | |
536 | strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p); | |
537 | if (access(cc, F_OK) < 0) | |
538 | return -errno; | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
3474ae3c LP |
543 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
544 | const char *p; | |
37099707 | 545 | int r; |
dbd821ac | 546 | |
3474ae3c | 547 | assert(fs); |
70132bd0 | 548 | |
3474ae3c LP |
549 | if (isempty(controller)) |
550 | return -EINVAL; | |
70132bd0 | 551 | |
37099707 | 552 | /* Normalize the controller syntax */ |
3474ae3c | 553 | p = normalize_controller(controller); |
8c6db833 | 554 | |
3474ae3c | 555 | /* Check if this controller actually really exists */ |
7027ff61 | 556 | r = check_hierarchy(p); |
37099707 LP |
557 | if (r < 0) |
558 | return r; | |
3474ae3c LP |
559 | |
560 | return join_path(p, path, suffix, fs); | |
8c6db833 LP |
561 | } |
562 | ||
e27796a0 LP |
563 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
564 | char *p; | |
565 | bool is_sticky; | |
566 | ||
567 | if (typeflag != FTW_DP) | |
568 | return 0; | |
569 | ||
570 | if (ftwbuf->level < 1) | |
571 | return 0; | |
572 | ||
573 | p = strappend(path, "/tasks"); | |
574 | if (!p) { | |
575 | errno = ENOMEM; | |
576 | return 1; | |
577 | } | |
578 | ||
8d53b453 | 579 | is_sticky = file_is_priv_sticky(p) > 0; |
e27796a0 LP |
580 | free(p); |
581 | ||
582 | if (is_sticky) | |
583 | return 0; | |
584 | ||
585 | rmdir(path); | |
586 | return 0; | |
587 | } | |
588 | ||
8c6db833 | 589 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 590 | _cleanup_free_ char *fs = NULL; |
e27796a0 | 591 | int r = 0; |
8c6db833 | 592 | |
8c6db833 LP |
593 | assert(path); |
594 | ||
e27796a0 LP |
595 | r = cg_get_path(controller, path, NULL, &fs); |
596 | if (r < 0) | |
8c6db833 LP |
597 | return r; |
598 | ||
e27796a0 | 599 | errno = 0; |
7027ff61 | 600 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) |
e27796a0 LP |
601 | r = errno ? -errno : -EIO; |
602 | ||
603 | if (delete_root) { | |
604 | bool is_sticky; | |
605 | char *p; | |
606 | ||
607 | p = strappend(fs, "/tasks"); | |
7027ff61 | 608 | if (!p) |
e27796a0 | 609 | return -ENOMEM; |
e27796a0 | 610 | |
8d53b453 | 611 | is_sticky = file_is_priv_sticky(p) > 0; |
e27796a0 LP |
612 | free(p); |
613 | ||
614 | if (!is_sticky) | |
7027ff61 LP |
615 | if (rmdir(fs) < 0 && errno != ENOENT && r == 0) |
616 | return -errno; | |
e27796a0 LP |
617 | } |
618 | ||
e27796a0 | 619 | return r; |
8c6db833 LP |
620 | } |
621 | ||
622 | int cg_delete(const char *controller, const char *path) { | |
7027ff61 | 623 | _cleanup_free_ char *parent = NULL; |
8c6db833 LP |
624 | int r; |
625 | ||
8c6db833 LP |
626 | assert(path); |
627 | ||
7027ff61 LP |
628 | r = path_get_parent(path, &parent); |
629 | if (r < 0) | |
35d2e7ec | 630 | return r; |
8c6db833 | 631 | |
246aa6dd | 632 | r = cg_migrate_recursive(controller, path, controller, parent, false, true); |
4c633005 | 633 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
634 | } |
635 | ||
8c6db833 | 636 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
637 | _cleanup_free_ char *fs = NULL; |
638 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
639 | int r; |
640 | ||
8c6db833 LP |
641 | assert(path); |
642 | assert(pid >= 0); | |
643 | ||
3474ae3c LP |
644 | r = cg_get_path_and_check(controller, path, "tasks", &fs); |
645 | if (r < 0) | |
c6c18be3 | 646 | return r; |
8c6db833 LP |
647 | |
648 | if (pid == 0) | |
649 | pid = getpid(); | |
650 | ||
c6c18be3 | 651 | snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid); |
8c6db833 | 652 | |
574d5f2d | 653 | return write_string_file(fs, c); |
8c6db833 LP |
654 | } |
655 | ||
2d76d14e LP |
656 | int cg_set_group_access( |
657 | const char *controller, | |
658 | const char *path, | |
659 | mode_t mode, | |
660 | uid_t uid, | |
661 | gid_t gid) { | |
662 | ||
574d5f2d | 663 | _cleanup_free_ char *fs = NULL; |
8c6db833 LP |
664 | int r; |
665 | ||
8c6db833 LP |
666 | assert(path); |
667 | ||
8d53b453 LP |
668 | if (mode != (mode_t) -1) |
669 | mode &= 0777; | |
670 | ||
671 | r = cg_get_path(controller, path, NULL, &fs); | |
672 | if (r < 0) | |
8c6db833 LP |
673 | return r; |
674 | ||
574d5f2d | 675 | return chmod_and_chown(fs, mode, uid, gid); |
8c6db833 LP |
676 | } |
677 | ||
974efc46 LP |
678 | int cg_set_task_access( |
679 | const char *controller, | |
680 | const char *path, | |
681 | mode_t mode, | |
682 | uid_t uid, | |
683 | gid_t gid, | |
684 | int sticky) { | |
685 | ||
686 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
8c6db833 LP |
687 | int r; |
688 | ||
8c6db833 LP |
689 | assert(path); |
690 | ||
8d53b453 LP |
691 | if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1 && sticky < 0) |
692 | return 0; | |
693 | ||
694 | if (mode != (mode_t) -1) | |
695 | mode &= 0666; | |
696 | ||
697 | r = cg_get_path(controller, path, "tasks", &fs); | |
698 | if (r < 0) | |
8c6db833 LP |
699 | return r; |
700 | ||
8d53b453 LP |
701 | if (sticky >= 0 && mode != (mode_t) -1) |
702 | /* Both mode and sticky param are passed */ | |
703 | mode |= (sticky ? S_ISVTX : 0); | |
704 | else if ((sticky >= 0 && mode == (mode_t) -1) || | |
705 | (mode != (mode_t) -1 && sticky < 0)) { | |
706 | struct stat st; | |
707 | ||
708 | /* Only one param is passed, hence read the current | |
709 | * mode from the file itself */ | |
710 | ||
711 | r = lstat(fs, &st); | |
974efc46 | 712 | if (r < 0) |
8d53b453 | 713 | return -errno; |
8d53b453 LP |
714 | |
715 | if (mode == (mode_t) -1) | |
716 | /* No mode set, we just shall set the sticky bit */ | |
717 | mode = (st.st_mode & ~S_ISVTX) | (sticky ? S_ISVTX : 0); | |
718 | else | |
719 | /* Only mode set, leave sticky bit untouched */ | |
720 | mode = (st.st_mode & ~0777) | mode; | |
721 | } | |
722 | ||
8c6db833 | 723 | r = chmod_and_chown(fs, mode, uid, gid); |
974efc46 LP |
724 | if (r < 0) |
725 | return r; | |
8c6db833 | 726 | |
974efc46 LP |
727 | /* Always keep values for "cgroup.procs" in sync with "tasks" */ |
728 | r = cg_get_path(controller, path, "cgroup.procs", &procs); | |
729 | if (r < 0) | |
730 | return r; | |
731 | ||
732 | return chmod_and_chown(procs, mode, uid, gid); | |
8c6db833 LP |
733 | } |
734 | ||
7027ff61 LP |
735 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
736 | char fs[sizeof("/proc/") - 1 + DECIMAL_STR_MAX(pid_t) + sizeof("/cgroup")]; | |
737 | _cleanup_fclose_ FILE *f = NULL; | |
738 | char line[LINE_MAX]; | |
c6c18be3 | 739 | size_t cs; |
8c6db833 | 740 | |
8c6db833 | 741 | assert(path); |
c6c18be3 | 742 | assert(pid >= 0); |
8c6db833 | 743 | |
7027ff61 LP |
744 | if (!controller) |
745 | controller = SYSTEMD_CGROUP_CONTROLLER; | |
746 | ||
c6c18be3 LP |
747 | if (pid == 0) |
748 | pid = getpid(); | |
8c6db833 | 749 | |
7027ff61 | 750 | sprintf(fs, "/proc/%lu/cgroup", (unsigned long) pid); |
c6c18be3 | 751 | f = fopen(fs, "re"); |
4c633005 LP |
752 | if (!f) |
753 | return errno == ENOENT ? -ESRCH : -errno; | |
754 | ||
c6c18be3 LP |
755 | cs = strlen(controller); |
756 | ||
7027ff61 LP |
757 | FOREACH_LINE(line, f, return -errno) { |
758 | char *l, *p; | |
c6c18be3 LP |
759 | |
760 | truncate_nl(line); | |
761 | ||
7027ff61 LP |
762 | l = strchr(line, ':'); |
763 | if (!l) | |
c6c18be3 LP |
764 | continue; |
765 | ||
766 | l++; | |
641906e9 | 767 | if (!strneq(l, controller, cs)) |
c6c18be3 LP |
768 | continue; |
769 | ||
770 | if (l[cs] != ':') | |
771 | continue; | |
772 | ||
7027ff61 LP |
773 | p = strdup(l + cs + 1); |
774 | if (!p) | |
775 | return -ENOMEM; | |
c6c18be3 LP |
776 | |
777 | *path = p; | |
7027ff61 | 778 | return 0; |
c6c18be3 LP |
779 | } |
780 | ||
7027ff61 | 781 | return -ENOENT; |
8c6db833 LP |
782 | } |
783 | ||
784 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 LP |
785 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
786 | char *sc; | |
8c6db833 LP |
787 | int r; |
788 | ||
8c6db833 LP |
789 | assert(agent); |
790 | ||
7027ff61 LP |
791 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
792 | if (r < 0) | |
c6c18be3 | 793 | return r; |
8c6db833 | 794 | |
7027ff61 LP |
795 | r = read_one_line_file(fs, &contents); |
796 | if (r < 0) | |
797 | return r; | |
8c6db833 LP |
798 | |
799 | sc = strstrip(contents); | |
8c6db833 | 800 | if (sc[0] == 0) { |
7027ff61 | 801 | r = write_string_file(fs, agent); |
574d5f2d | 802 | if (r < 0) |
7027ff61 LP |
803 | return r; |
804 | } else if (!streq(sc, agent)) | |
805 | return -EEXIST; | |
8c6db833 | 806 | |
c6c18be3 LP |
807 | free(fs); |
808 | fs = NULL; | |
7027ff61 LP |
809 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
810 | if (r < 0) | |
811 | return r; | |
8c6db833 LP |
812 | |
813 | free(contents); | |
814 | contents = NULL; | |
7027ff61 LP |
815 | r = read_one_line_file(fs, &contents); |
816 | if (r < 0) | |
817 | return r; | |
8c6db833 LP |
818 | |
819 | sc = strstrip(contents); | |
8c6db833 | 820 | if (streq(sc, "0")) { |
7027ff61 LP |
821 | r = write_string_file(fs, "1"); |
822 | if (r < 0) | |
823 | return r; | |
c6c18be3 | 824 | |
7027ff61 LP |
825 | return 1; |
826 | } | |
8c6db833 | 827 | |
7027ff61 LP |
828 | if (!streq(sc, "1")) |
829 | return -EIO; | |
8c6db833 | 830 | |
7027ff61 | 831 | return 0; |
8c6db833 LP |
832 | } |
833 | ||
834 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { | |
7027ff61 | 835 | _cleanup_fclose_ FILE *f = NULL; |
c3175a7f | 836 | pid_t pid = 0, self_pid; |
c6c18be3 | 837 | bool found = false; |
7027ff61 | 838 | int r; |
8c6db833 | 839 | |
8c6db833 LP |
840 | assert(path); |
841 | ||
c3175a7f LP |
842 | r = cg_enumerate_tasks(controller, path, &f); |
843 | if (r < 0) | |
4c633005 | 844 | return r == -ENOENT ? 1 : r; |
8c6db833 | 845 | |
c3175a7f LP |
846 | self_pid = getpid(); |
847 | ||
c6c18be3 | 848 | while ((r = cg_read_pid(f, &pid)) > 0) { |
8c6db833 | 849 | |
c3175a7f | 850 | if (ignore_self && pid == self_pid) |
c6c18be3 | 851 | continue; |
8c6db833 | 852 | |
c6c18be3 LP |
853 | found = true; |
854 | break; | |
8c6db833 LP |
855 | } |
856 | ||
c6c18be3 LP |
857 | if (r < 0) |
858 | return r; | |
8c6db833 | 859 | |
c6c18be3 | 860 | return !found; |
8c6db833 LP |
861 | } |
862 | ||
b08121d0 | 863 | int cg_is_empty_by_spec(const char *spec, bool ignore_self) { |
b08121d0 | 864 | _cleanup_free_ char *controller = NULL, *path = NULL; |
7027ff61 | 865 | int r; |
b08121d0 LP |
866 | |
867 | assert(spec); | |
868 | ||
869 | r = cg_split_spec(spec, &controller, &path); | |
870 | if (r < 0) | |
871 | return r; | |
872 | ||
873 | return cg_is_empty(controller, path, ignore_self); | |
874 | } | |
875 | ||
8c6db833 | 876 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { |
7027ff61 | 877 | _cleanup_closedir_ DIR *d = NULL; |
35d2e7ec | 878 | char *fn; |
7027ff61 | 879 | int r; |
8c6db833 | 880 | |
8c6db833 LP |
881 | assert(path); |
882 | ||
c3175a7f LP |
883 | r = cg_is_empty(controller, path, ignore_self); |
884 | if (r <= 0) | |
35d2e7ec LP |
885 | return r; |
886 | ||
c3175a7f LP |
887 | r = cg_enumerate_subgroups(controller, path, &d); |
888 | if (r < 0) | |
4c633005 | 889 | return r == -ENOENT ? 1 : r; |
8c6db833 | 890 | |
35d2e7ec | 891 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 892 | _cleanup_free_ char *p = NULL; |
8c6db833 | 893 | |
7027ff61 | 894 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 895 | free(fn); |
7027ff61 LP |
896 | if (!p) |
897 | return -ENOMEM; | |
8c6db833 | 898 | |
35d2e7ec | 899 | r = cg_is_empty_recursive(controller, p, ignore_self); |
35d2e7ec | 900 | if (r <= 0) |
7027ff61 | 901 | return r; |
35d2e7ec LP |
902 | } |
903 | ||
7027ff61 LP |
904 | if (r < 0) |
905 | return r; | |
35d2e7ec | 906 | |
7027ff61 | 907 | return 1; |
35d2e7ec LP |
908 | } |
909 | ||
910 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
911 | const char *e; | |
912 | char *t = NULL, *u = NULL; | |
913 | ||
914 | assert(spec); | |
35d2e7ec LP |
915 | |
916 | if (*spec == '/') { | |
e884315e LP |
917 | if (!path_is_safe(spec)) |
918 | return -EINVAL; | |
35d2e7ec LP |
919 | |
920 | if (path) { | |
246aa6dd LP |
921 | t = strdup(spec); |
922 | if (!t) | |
35d2e7ec LP |
923 | return -ENOMEM; |
924 | ||
925 | *path = t; | |
8c6db833 LP |
926 | } |
927 | ||
35d2e7ec LP |
928 | if (controller) |
929 | *controller = NULL; | |
930 | ||
931 | return 0; | |
8c6db833 LP |
932 | } |
933 | ||
246aa6dd LP |
934 | e = strchr(spec, ':'); |
935 | if (!e) { | |
e884315e | 936 | if (!filename_is_safe(spec)) |
35d2e7ec LP |
937 | return -EINVAL; |
938 | ||
939 | if (controller) { | |
246aa6dd LP |
940 | t = strdup(spec); |
941 | if (!t) | |
35d2e7ec LP |
942 | return -ENOMEM; |
943 | ||
944 | *controller = t; | |
945 | } | |
946 | ||
947 | if (path) | |
948 | *path = NULL; | |
949 | ||
950 | return 0; | |
8c6db833 LP |
951 | } |
952 | ||
e884315e LP |
953 | t = strndup(spec, e-spec); |
954 | if (!t) | |
955 | return -ENOMEM; | |
956 | if (!filename_is_safe(t)) { | |
957 | free(t); | |
35d2e7ec | 958 | return -EINVAL; |
246aa6dd LP |
959 | } |
960 | ||
e884315e LP |
961 | u = strdup(e+1); |
962 | if (!u) { | |
963 | free(t); | |
964 | return -ENOMEM; | |
965 | } | |
966 | if (!path_is_safe(u)) { | |
967 | free(t); | |
968 | free(u); | |
969 | return -EINVAL; | |
246aa6dd | 970 | } |
35d2e7ec LP |
971 | |
972 | if (controller) | |
973 | *controller = t; | |
e884315e LP |
974 | else |
975 | free(t); | |
35d2e7ec LP |
976 | |
977 | if (path) | |
978 | *path = u; | |
e884315e LP |
979 | else |
980 | free(u); | |
35d2e7ec LP |
981 | |
982 | return 0; | |
8c6db833 | 983 | } |
c6c18be3 | 984 | |
35d2e7ec | 985 | int cg_join_spec(const char *controller, const char *path, char **spec) { |
7027ff61 LP |
986 | char *s; |
987 | ||
35d2e7ec | 988 | assert(path); |
c6c18be3 | 989 | |
7027ff61 LP |
990 | if (!controller) |
991 | controller = "systemd"; | |
992 | else if (controller[0] == 0 || | |
993 | strchr(controller, ':') || | |
994 | strchr(controller, '/')) | |
35d2e7ec LP |
995 | return -EINVAL; |
996 | ||
7027ff61 LP |
997 | if (!path_is_absolute(path)) |
998 | return -EINVAL; | |
999 | ||
1000 | controller = normalize_controller(controller); | |
1001 | ||
1002 | s = strjoin(controller, ":", path, NULL); | |
1003 | if (!s) | |
35d2e7ec | 1004 | return -ENOMEM; |
c6c18be3 | 1005 | |
7027ff61 | 1006 | *spec = s; |
c6c18be3 LP |
1007 | return 0; |
1008 | } | |
35d2e7ec | 1009 | |
7027ff61 | 1010 | int cg_mangle_path(const char *path, char **result) { |
35d2e7ec LP |
1011 | char *t, *c, *p; |
1012 | int r; | |
1013 | ||
1014 | assert(path); | |
1015 | assert(result); | |
1016 | ||
1017 | /* First check if it already is a filesystem path */ | |
7027ff61 | 1018 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 1019 | |
b69d29ce LP |
1020 | t = strdup(path); |
1021 | if (!t) | |
35d2e7ec LP |
1022 | return -ENOMEM; |
1023 | ||
1024 | *result = t; | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | /* Otherwise treat it as cg spec */ | |
b69d29ce LP |
1029 | r = cg_split_spec(path, &c, &p); |
1030 | if (r < 0) | |
35d2e7ec LP |
1031 | return r; |
1032 | ||
1033 | r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); | |
1034 | free(c); | |
1035 | free(p); | |
1036 | ||
1037 | return r; | |
1038 | } | |
1f73f0f1 | 1039 | |
7027ff61 LP |
1040 | int cg_get_system_path(char **path) { |
1041 | char *p; | |
1042 | int r; | |
1043 | ||
1044 | assert(path); | |
1045 | ||
1046 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); | |
1047 | if (r < 0) { | |
1048 | p = strdup("/system"); | |
1049 | if (!p) | |
1050 | return -ENOMEM; | |
1051 | } | |
1052 | ||
1053 | if (endswith(p, "/system")) | |
1054 | *path = p; | |
1055 | else { | |
1056 | char *q; | |
1057 | ||
1058 | q = strappend(p, "/system"); | |
1059 | free(p); | |
1060 | if (!q) | |
1061 | return -ENOMEM; | |
1062 | ||
1063 | *path = q; | |
1064 | } | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | int cg_get_root_path(char **path) { | |
1070 | char *root, *e; | |
1071 | int r; | |
1072 | ||
1073 | assert(path); | |
1074 | ||
1075 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &root); | |
1076 | if (r < 0) | |
1077 | return r; | |
1078 | ||
1079 | e = endswith(root, "/system"); | |
1080 | if (e == root) | |
1081 | e[1] = 0; | |
1082 | else if (e) | |
1083 | *e = 0; | |
1084 | ||
1085 | *path = root; | |
1086 | return 0; | |
1087 | } | |
1088 | ||
1f73f0f1 | 1089 | int cg_get_user_path(char **path) { |
7027ff61 LP |
1090 | _cleanup_free_ char *root = NULL; |
1091 | char *p; | |
1f73f0f1 LP |
1092 | |
1093 | assert(path); | |
1094 | ||
1095 | /* Figure out the place to put user cgroups below. We use the | |
1096 | * same as PID 1 has but with the "/system" suffix replaced by | |
1097 | * "/user" */ | |
1098 | ||
7027ff61 | 1099 | if (cg_get_root_path(&root) < 0 || streq(root, "/")) |
1f73f0f1 | 1100 | p = strdup("/user"); |
7027ff61 | 1101 | else |
1f73f0f1 | 1102 | p = strappend(root, "/user"); |
7027ff61 LP |
1103 | |
1104 | if (!p) | |
1105 | return -ENOMEM; | |
1106 | ||
1107 | *path = p; | |
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | int cg_get_machine_path(char **path) { | |
1112 | _cleanup_free_ char *root = NULL; | |
1113 | char *p; | |
1114 | ||
1115 | assert(path); | |
1116 | ||
1117 | if (cg_get_root_path(&root) < 0 || streq(root, "/")) | |
1118 | p = strdup("/machine"); | |
1119 | else | |
1120 | p = strappend(root, "/machine"); | |
1f73f0f1 LP |
1121 | |
1122 | if (!p) | |
1123 | return -ENOMEM; | |
1124 | ||
1125 | *path = p; | |
1126 | return 0; | |
1127 | } | |
b59e2465 LP |
1128 | |
1129 | char **cg_shorten_controllers(char **controllers) { | |
1130 | char **f, **t; | |
1131 | ||
b59e2465 LP |
1132 | if (!controllers) |
1133 | return controllers; | |
1134 | ||
1135 | for (f = controllers, t = controllers; *f; f++) { | |
37099707 | 1136 | const char *p; |
7027ff61 LP |
1137 | int r; |
1138 | ||
1139 | p = normalize_controller(*f); | |
b59e2465 | 1140 | |
7027ff61 | 1141 | if (streq(*f, "systemd")) { |
b59e2465 LP |
1142 | free(*f); |
1143 | continue; | |
1144 | } | |
1145 | ||
7027ff61 | 1146 | r = check_hierarchy(p); |
37099707 | 1147 | if (r < 0) { |
b59e2465 LP |
1148 | log_debug("Controller %s is not available, removing from controllers list.", *f); |
1149 | free(*f); | |
1150 | continue; | |
1151 | } | |
1152 | ||
1153 | *(t++) = *f; | |
1154 | } | |
1155 | ||
1156 | *t = NULL; | |
6c03089c | 1157 | return strv_uniq(controllers); |
b59e2465 | 1158 | } |
ba1261bc | 1159 | |
7027ff61 LP |
1160 | int cg_pid_get_path_shifted(pid_t pid, char **root, char **cgroup) { |
1161 | _cleanup_free_ char *cg_root = NULL; | |
1162 | char *cg_process, *p; | |
ba1261bc LP |
1163 | int r; |
1164 | ||
7027ff61 | 1165 | r = cg_get_root_path(&cg_root); |
ba1261bc LP |
1166 | if (r < 0) |
1167 | return r; | |
1168 | ||
7027ff61 LP |
1169 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process); |
1170 | if (r < 0) | |
ba1261bc | 1171 | return r; |
ba1261bc | 1172 | |
7027ff61 LP |
1173 | p = path_startswith(cg_process, cg_root); |
1174 | if (p) | |
1175 | p--; | |
1176 | else | |
1177 | p = cg_process; | |
ba1261bc LP |
1178 | |
1179 | if (cgroup) { | |
1180 | char* c; | |
1181 | ||
1182 | c = strdup(p); | |
1183 | if (!c) { | |
1184 | free(cg_process); | |
1185 | return -ENOMEM; | |
1186 | } | |
1187 | ||
1188 | *cgroup = c; | |
1189 | } | |
1190 | ||
1191 | if (root) { | |
1192 | cg_process[p-cg_process] = 0; | |
1193 | *root = cg_process; | |
1194 | } else | |
1195 | free(cg_process); | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1199 | ||
6c03089c | 1200 | /* non-static only for testing purposes */ |
7027ff61 | 1201 | int cg_path_decode_unit(const char *cgroup, char **unit){ |
6c03089c | 1202 | char *p, *e, *c, *s, *k; |
ef1673d1 MT |
1203 | |
1204 | assert(cgroup); | |
6c03089c | 1205 | assert(unit); |
ef1673d1 | 1206 | |
6c03089c LP |
1207 | e = strchrnul(cgroup, '/'); |
1208 | c = strndupa(cgroup, e - cgroup); | |
ef1673d1 | 1209 | |
6c03089c LP |
1210 | /* Could this be a valid unit name? */ |
1211 | if (!unit_name_is_valid(c, true)) | |
1212 | return -EINVAL; | |
ef1673d1 | 1213 | |
6c03089c LP |
1214 | if (!unit_name_is_template(c)) |
1215 | s = strdup(c); | |
1216 | else { | |
1217 | if (*e != '/') | |
96cde13a | 1218 | return -EINVAL; |
ef1673d1 | 1219 | |
6c03089c LP |
1220 | e += strspn(e, "/"); |
1221 | p = strchrnul(e, '/'); | |
ef1673d1 | 1222 | |
6c03089c LP |
1223 | /* Don't allow empty instance strings */ |
1224 | if (p == e) | |
1225 | return -EINVAL; | |
1226 | ||
1227 | k = strndupa(e, p - e); | |
1228 | ||
1229 | s = unit_name_replace_instance(c, k); | |
ef1673d1 MT |
1230 | } |
1231 | ||
6c03089c LP |
1232 | if (!s) |
1233 | return -ENOMEM; | |
1234 | ||
1235 | *unit = s; | |
ef1673d1 MT |
1236 | return 0; |
1237 | } | |
1238 | ||
6c03089c LP |
1239 | int cg_path_get_unit(const char *path, char **unit) { |
1240 | const char *e; | |
1241 | ||
1242 | assert(path); | |
1243 | assert(unit); | |
1244 | ||
1245 | e = path_startswith(path, "/system/"); | |
1246 | if (!e) | |
1247 | return -ENOENT; | |
1248 | ||
7027ff61 | 1249 | return cg_path_decode_unit(e, unit); |
6c03089c LP |
1250 | } |
1251 | ||
1252 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
1253 | char _cleanup_free_ *cgroup = NULL; | |
ba1261bc | 1254 | int r; |
ba1261bc | 1255 | |
ef1673d1 MT |
1256 | assert(unit); |
1257 | ||
7027ff61 | 1258 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1259 | if (r < 0) |
1260 | return r; | |
1261 | ||
6c03089c LP |
1262 | return cg_path_get_unit(cgroup, unit); |
1263 | } | |
ef1673d1 | 1264 | |
6c03089c LP |
1265 | static const char *skip_label(const char *e) { |
1266 | assert(e); | |
ef1673d1 | 1267 | |
6c03089c LP |
1268 | e = strchr(e, '/'); |
1269 | if (!e) | |
1270 | return NULL; | |
ef1673d1 | 1271 | |
6c03089c LP |
1272 | e += strspn(e, "/"); |
1273 | return e; | |
ef1673d1 MT |
1274 | } |
1275 | ||
6c03089c LP |
1276 | int cg_path_get_user_unit(const char *path, char **unit) { |
1277 | const char *e; | |
ef1673d1 | 1278 | |
6c03089c | 1279 | assert(path); |
ba1261bc LP |
1280 | assert(unit); |
1281 | ||
6c03089c LP |
1282 | /* We always have to parse the path from the beginning as unit |
1283 | * cgroups might have arbitrary child cgroups and we shouldn't get | |
1284 | * confused by those */ | |
ba1261bc | 1285 | |
6c03089c LP |
1286 | e = path_startswith(path, "/user/"); |
1287 | if (!e) | |
ba1261bc | 1288 | return -ENOENT; |
ba1261bc | 1289 | |
6c03089c LP |
1290 | /* Skip the user name */ |
1291 | e = skip_label(e); | |
1292 | if (!e) | |
1293 | return -ENOENT; | |
ba1261bc | 1294 | |
6c03089c LP |
1295 | /* Skip the session ID */ |
1296 | e = skip_label(e); | |
1297 | if (!e) | |
1298 | return -ENOENT; | |
1299 | ||
1300 | /* Skip the systemd cgroup */ | |
1301 | e = skip_label(e); | |
1302 | if (!e) | |
1303 | return -ENOENT; | |
1304 | ||
7027ff61 | 1305 | return cg_path_decode_unit(e, unit); |
ef1673d1 | 1306 | } |
ba1261bc | 1307 | |
ef1673d1 | 1308 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
6c03089c LP |
1309 | char _cleanup_free_ *cgroup = NULL; |
1310 | int r; | |
1311 | ||
1312 | assert(unit); | |
1313 | ||
7027ff61 | 1314 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1315 | if (r < 0) |
1316 | return r; | |
1317 | ||
1318 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1319 | } |
e884315e | 1320 | |
7027ff61 LP |
1321 | int cg_path_get_machine_name(const char *path, char **machine) { |
1322 | const char *e, *n; | |
1323 | char *s; | |
1324 | ||
1325 | assert(path); | |
1326 | assert(machine); | |
1327 | ||
1328 | e = path_startswith(path, "/machine/"); | |
1329 | if (!e) | |
1330 | return -ENOENT; | |
1331 | ||
1332 | n = strchrnul(e, '/'); | |
1333 | if (e == n) | |
1334 | return -ENOENT; | |
1335 | ||
1336 | s = strndup(e, n - e); | |
1337 | if (!s) | |
1338 | return -ENOMEM; | |
1339 | ||
1340 | *machine = s; | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
1345 | char _cleanup_free_ *cgroup = NULL; | |
1346 | int r; | |
1347 | ||
1348 | assert(machine); | |
1349 | ||
1350 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1351 | if (r < 0) | |
1352 | return r; | |
1353 | ||
1354 | return cg_path_get_machine_name(cgroup, machine); | |
1355 | } | |
1356 | ||
1357 | int cg_path_get_session(const char *path, char **session) { | |
1358 | const char *e, *n; | |
1359 | char *s; | |
1360 | ||
1361 | assert(path); | |
1362 | assert(session); | |
1363 | ||
1364 | e = path_startswith(path, "/user/"); | |
1365 | if (!e) | |
1366 | return -ENOENT; | |
1367 | ||
1368 | /* Skip the user name */ | |
1369 | e = skip_label(e); | |
1370 | if (!e) | |
1371 | return -ENOENT; | |
1372 | ||
1373 | n = strchrnul(e, '/'); | |
1374 | if (e == n) | |
1375 | return -ENOENT; | |
1376 | ||
1377 | if (n - e == 6 && memcmp(e, "shared", 6) == 0) | |
1378 | return -ENOENT; | |
1379 | ||
1380 | s = strndup(e, n - e); | |
1381 | if (!s) | |
1382 | return -ENOMEM; | |
1383 | ||
1384 | *session = s; | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | int cg_pid_get_session(pid_t pid, char **session) { | |
1389 | char _cleanup_free_ *cgroup = NULL; | |
1390 | int r; | |
1391 | ||
1392 | assert(session); | |
1393 | ||
1394 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1395 | if (r < 0) | |
1396 | return r; | |
1397 | ||
1398 | return cg_path_get_session(cgroup, session); | |
1399 | } | |
1400 | ||
e884315e LP |
1401 | int cg_controller_from_attr(const char *attr, char **controller) { |
1402 | const char *dot; | |
1403 | char *c; | |
1404 | ||
1405 | assert(attr); | |
1406 | assert(controller); | |
1407 | ||
1408 | if (!filename_is_safe(attr)) | |
1409 | return -EINVAL; | |
1410 | ||
1411 | dot = strchr(attr, '.'); | |
1412 | if (!dot) { | |
1413 | *controller = NULL; | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | c = strndup(attr, dot - attr); | |
1418 | if (!c) | |
1419 | return -ENOMEM; | |
1420 | ||
1421 | if (!filename_is_safe(c)) { | |
1422 | free(c); | |
1423 | return -EINVAL; | |
1424 | } | |
1425 | ||
1426 | *controller = c; | |
1427 | return 1; | |
1428 | } |