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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" |
8c6db833 | 42 | |
c6c18be3 | 43 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
7027ff61 | 44 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 45 | FILE *f; |
7027ff61 | 46 | int r; |
c6c18be3 | 47 | |
c6c18be3 LP |
48 | assert(_f); |
49 | ||
c3175a7f LP |
50 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
51 | if (r < 0) | |
c6c18be3 LP |
52 | return r; |
53 | ||
54 | f = fopen(fs, "re"); | |
c6c18be3 LP |
55 | if (!f) |
56 | return -errno; | |
57 | ||
58 | *_f = f; | |
59 | return 0; | |
60 | } | |
61 | ||
c6c18be3 LP |
62 | int cg_read_pid(FILE *f, pid_t *_pid) { |
63 | unsigned long ul; | |
64 | ||
65 | /* Note that the cgroup.procs might contain duplicates! See | |
66 | * cgroups.txt for details. */ | |
67 | ||
7027ff61 LP |
68 | assert(f); |
69 | assert(_pid); | |
70 | ||
c6c18be3 LP |
71 | errno = 0; |
72 | if (fscanf(f, "%lu", &ul) != 1) { | |
73 | ||
74 | if (feof(f)) | |
75 | return 0; | |
76 | ||
77 | return errno ? -errno : -EIO; | |
78 | } | |
79 | ||
80 | if (ul <= 0) | |
81 | return -EIO; | |
82 | ||
83 | *_pid = (pid_t) ul; | |
84 | return 1; | |
85 | } | |
86 | ||
35d2e7ec | 87 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
7027ff61 | 88 | _cleanup_free_ char *fs = NULL; |
35d2e7ec LP |
89 | int r; |
90 | DIR *d; | |
91 | ||
35d2e7ec LP |
92 | assert(_d); |
93 | ||
94 | /* This is not recursive! */ | |
95 | ||
c3175a7f LP |
96 | r = cg_get_path(controller, path, NULL, &fs); |
97 | if (r < 0) | |
35d2e7ec LP |
98 | return r; |
99 | ||
100 | d = opendir(fs); | |
35d2e7ec LP |
101 | if (!d) |
102 | return -errno; | |
103 | ||
104 | *_d = d; | |
105 | return 0; | |
106 | } | |
107 | ||
108 | int cg_read_subgroup(DIR *d, char **fn) { | |
109 | struct dirent *de; | |
110 | ||
111 | assert(d); | |
7027ff61 | 112 | assert(fn); |
35d2e7ec | 113 | |
7027ff61 | 114 | FOREACH_DIRENT(de, d, return -errno) { |
35d2e7ec LP |
115 | char *b; |
116 | ||
117 | if (de->d_type != DT_DIR) | |
118 | continue; | |
119 | ||
120 | if (streq(de->d_name, ".") || | |
121 | streq(de->d_name, "..")) | |
122 | continue; | |
123 | ||
7027ff61 LP |
124 | b = strdup(de->d_name); |
125 | if (!b) | |
35d2e7ec LP |
126 | return -ENOMEM; |
127 | ||
128 | *fn = b; | |
129 | return 1; | |
130 | } | |
131 | ||
35d2e7ec LP |
132 | return 0; |
133 | } | |
134 | ||
4ad49000 | 135 | int cg_rmdir(const char *controller, const char *path) { |
7027ff61 | 136 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
137 | int r; |
138 | ||
ad293f5a LP |
139 | r = cg_get_path(controller, path, NULL, &p); |
140 | if (r < 0) | |
35d2e7ec LP |
141 | return r; |
142 | ||
143 | r = rmdir(p); | |
7027ff61 LP |
144 | if (r < 0 && errno != ENOENT) |
145 | return -errno; | |
35d2e7ec | 146 | |
7027ff61 | 147 | return 0; |
35d2e7ec LP |
148 | } |
149 | ||
430c18ed | 150 | int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { |
7027ff61 | 151 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 152 | bool done = false; |
8c6db833 | 153 | int r, ret = 0; |
35d2e7ec | 154 | pid_t my_pid; |
8c6db833 | 155 | |
8c6db833 LP |
156 | assert(sig >= 0); |
157 | ||
158 | /* This goes through the tasks list and kills them all. This | |
159 | * is repeated until no further processes are added to the | |
160 | * tasks list, to properly handle forking processes */ | |
161 | ||
7027ff61 LP |
162 | if (!s) { |
163 | s = allocated_set = set_new(trivial_hash_func, trivial_compare_func); | |
164 | if (!s) | |
ca949c9d | 165 | return -ENOMEM; |
7027ff61 | 166 | } |
8c6db833 LP |
167 | |
168 | my_pid = getpid(); | |
169 | ||
170 | do { | |
7027ff61 | 171 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 172 | pid_t pid = 0; |
8c6db833 LP |
173 | done = true; |
174 | ||
7027ff61 LP |
175 | r = cg_enumerate_processes(controller, path, &f); |
176 | if (r < 0) { | |
4c633005 | 177 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 178 | return r; |
35d2e7ec | 179 | |
7027ff61 | 180 | return ret; |
35d2e7ec | 181 | } |
c6c18be3 LP |
182 | |
183 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 184 | |
7027ff61 | 185 | if (ignore_self && pid == my_pid) |
c6c18be3 | 186 | continue; |
8c6db833 | 187 | |
c6c18be3 LP |
188 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
189 | continue; | |
8c6db833 LP |
190 | |
191 | /* If we haven't killed this process yet, kill | |
192 | * it */ | |
4c633005 LP |
193 | if (kill(pid, sig) < 0) { |
194 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 195 | ret = -errno; |
430c18ed LP |
196 | } else if (ret == 0) { |
197 | ||
198 | if (sigcont) | |
199 | kill(pid, SIGCONT); | |
200 | ||
35d2e7ec | 201 | ret = 1; |
430c18ed | 202 | } |
8c6db833 | 203 | |
8c6db833 LP |
204 | done = false; |
205 | ||
7027ff61 LP |
206 | r = set_put(s, LONG_TO_PTR(pid)); |
207 | if (r < 0) { | |
35d2e7ec | 208 | if (ret >= 0) |
7027ff61 | 209 | return r; |
35d2e7ec | 210 | |
7027ff61 | 211 | return ret; |
35d2e7ec LP |
212 | } |
213 | } | |
214 | ||
215 | if (r < 0) { | |
216 | if (ret >= 0) | |
7027ff61 | 217 | return r; |
35d2e7ec | 218 | |
7027ff61 | 219 | return ret; |
8c6db833 LP |
220 | } |
221 | ||
8c6db833 LP |
222 | /* To avoid racing against processes which fork |
223 | * quicker than we can kill them we repeat this until | |
224 | * no new pids need to be killed. */ | |
225 | ||
35d2e7ec | 226 | } while (!done); |
8c6db833 | 227 | |
35d2e7ec | 228 | return ret; |
8c6db833 LP |
229 | } |
230 | ||
430c18ed | 231 | int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { |
7027ff61 LP |
232 | _cleanup_set_free_ Set *allocated_set = NULL; |
233 | _cleanup_closedir_ DIR *d = NULL; | |
35d2e7ec | 234 | int r, ret = 0; |
35d2e7ec | 235 | char *fn; |
8c6db833 LP |
236 | |
237 | assert(path); | |
8c6db833 LP |
238 | assert(sig >= 0); |
239 | ||
7027ff61 LP |
240 | if (!s) { |
241 | s = allocated_set = set_new(trivial_hash_func, trivial_compare_func); | |
242 | if (!s) | |
ca949c9d | 243 | return -ENOMEM; |
7027ff61 | 244 | } |
ca949c9d | 245 | |
430c18ed | 246 | ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); |
8c6db833 | 247 | |
7027ff61 LP |
248 | r = cg_enumerate_subgroups(controller, path, &d); |
249 | if (r < 0) { | |
4c633005 | 250 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 251 | return r; |
8c6db833 | 252 | |
7027ff61 | 253 | return ret; |
35d2e7ec | 254 | } |
8c6db833 | 255 | |
35d2e7ec | 256 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 257 | _cleanup_free_ char *p = NULL; |
8c6db833 | 258 | |
7027ff61 | 259 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 260 | free(fn); |
7027ff61 LP |
261 | if (!p) |
262 | return -ENOMEM; | |
8c6db833 | 263 | |
430c18ed | 264 | r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); |
7027ff61 | 265 | if (ret >= 0 && r != 0) |
35d2e7ec | 266 | ret = r; |
8c6db833 LP |
267 | } |
268 | ||
7027ff61 | 269 | if (ret >= 0 && r < 0) |
35d2e7ec LP |
270 | ret = r; |
271 | ||
7027ff61 | 272 | if (rem) { |
4ad49000 | 273 | r = cg_rmdir(controller, path); |
7027ff61 LP |
274 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
275 | return r; | |
276 | } | |
ca949c9d | 277 | |
8c6db833 LP |
278 | return ret; |
279 | } | |
280 | ||
35d2e7ec | 281 | int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) { |
8c6db833 LP |
282 | unsigned i; |
283 | ||
284 | assert(path); | |
8c6db833 LP |
285 | |
286 | /* This safely kills all processes; first it sends a SIGTERM, | |
9f452741 LP |
287 | * then checks 8 times after 200ms whether the group is now |
288 | * empty, then kills everything that is left with SIGKILL and | |
289 | * finally checks 5 times after 200ms each whether the group | |
290 | * is finally empty. */ | |
8c6db833 | 291 | |
9f452741 | 292 | for (i = 0; i < 15; i++) { |
1d0ae74a | 293 | int sig, r; |
8c6db833 LP |
294 | |
295 | if (i <= 0) | |
296 | sig = SIGTERM; | |
9f452741 | 297 | else if (i == 9) |
8c6db833 LP |
298 | sig = SIGKILL; |
299 | else | |
300 | sig = 0; | |
301 | ||
7027ff61 LP |
302 | r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL); |
303 | if (r <= 0) | |
8c6db833 LP |
304 | return r; |
305 | ||
9f452741 | 306 | usleep(200 * USEC_PER_MSEC); |
8c6db833 LP |
307 | } |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
246aa6dd | 312 | int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) { |
35d2e7ec | 313 | bool done = false; |
246aa6dd | 314 | _cleanup_set_free_ Set *s = NULL; |
8c6db833 LP |
315 | int r, ret = 0; |
316 | pid_t my_pid; | |
317 | ||
246aa6dd LP |
318 | assert(cfrom); |
319 | assert(pfrom); | |
320 | assert(cto); | |
321 | assert(pto); | |
8c6db833 | 322 | |
246aa6dd LP |
323 | s = set_new(trivial_hash_func, trivial_compare_func); |
324 | if (!s) | |
35d2e7ec LP |
325 | return -ENOMEM; |
326 | ||
8c6db833 LP |
327 | my_pid = getpid(); |
328 | ||
329 | do { | |
7027ff61 | 330 | _cleanup_fclose_ FILE *f = NULL; |
0b172489 | 331 | pid_t pid = 0; |
8c6db833 LP |
332 | done = true; |
333 | ||
b043cd0b | 334 | r = cg_enumerate_processes(cfrom, pfrom, &f); |
246aa6dd | 335 | if (r < 0) { |
4c633005 | 336 | if (ret >= 0 && r != -ENOENT) |
7027ff61 | 337 | return r; |
35d2e7ec | 338 | |
246aa6dd | 339 | return ret; |
35d2e7ec | 340 | } |
c6c18be3 LP |
341 | |
342 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 343 | |
35d2e7ec LP |
344 | /* This might do weird stuff if we aren't a |
345 | * single-threaded program. However, we | |
346 | * luckily know we are not */ | |
7027ff61 | 347 | if (ignore_self && pid == my_pid) |
c6c18be3 | 348 | continue; |
8c6db833 | 349 | |
35d2e7ec LP |
350 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
351 | continue; | |
352 | ||
246aa6dd LP |
353 | r = cg_attach(cto, pto, pid); |
354 | if (r < 0) { | |
4c633005 | 355 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
356 | ret = r; |
357 | } else if (ret == 0) | |
358 | ret = 1; | |
8c6db833 | 359 | |
8c6db833 | 360 | done = false; |
35d2e7ec | 361 | |
246aa6dd LP |
362 | r = set_put(s, LONG_TO_PTR(pid)); |
363 | if (r < 0) { | |
35d2e7ec | 364 | if (ret >= 0) |
7027ff61 | 365 | return r; |
35d2e7ec | 366 | |
246aa6dd | 367 | return ret; |
35d2e7ec LP |
368 | } |
369 | } | |
370 | ||
371 | if (r < 0) { | |
372 | if (ret >= 0) | |
7027ff61 | 373 | return r; |
35d2e7ec | 374 | |
246aa6dd | 375 | return ret; |
8c6db833 | 376 | } |
35d2e7ec | 377 | } while (!done); |
8c6db833 | 378 | |
35d2e7ec | 379 | return ret; |
8c6db833 LP |
380 | } |
381 | ||
4ad49000 LP |
382 | int cg_migrate_recursive( |
383 | const char *cfrom, | |
384 | const char *pfrom, | |
385 | const char *cto, | |
386 | const char *pto, | |
387 | bool ignore_self, | |
388 | bool rem) { | |
389 | ||
246aa6dd | 390 | _cleanup_closedir_ DIR *d = NULL; |
7027ff61 | 391 | int r, ret = 0; |
35d2e7ec | 392 | char *fn; |
8c6db833 | 393 | |
246aa6dd LP |
394 | assert(cfrom); |
395 | assert(pfrom); | |
396 | assert(cto); | |
397 | assert(pto); | |
8c6db833 | 398 | |
246aa6dd | 399 | ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self); |
8c6db833 | 400 | |
246aa6dd LP |
401 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); |
402 | if (r < 0) { | |
4c633005 | 403 | if (ret >= 0 && r != -ENOENT) |
7027ff61 LP |
404 | return r; |
405 | ||
246aa6dd | 406 | return ret; |
35d2e7ec LP |
407 | } |
408 | ||
409 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
246aa6dd | 410 | _cleanup_free_ char *p = NULL; |
8c6db833 | 411 | |
246aa6dd | 412 | p = strjoin(pfrom, "/", fn, NULL); |
35d2e7ec | 413 | free(fn); |
246aa6dd | 414 | if (!p) { |
35d2e7ec | 415 | if (ret >= 0) |
7027ff61 | 416 | return -ENOMEM; |
35d2e7ec | 417 | |
246aa6dd | 418 | return ret; |
8c6db833 LP |
419 | } |
420 | ||
246aa6dd | 421 | r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem); |
35d2e7ec LP |
422 | if (r != 0 && ret >= 0) |
423 | ret = r; | |
8c6db833 LP |
424 | } |
425 | ||
35d2e7ec LP |
426 | if (r < 0 && ret >= 0) |
427 | ret = r; | |
428 | ||
246aa6dd | 429 | if (rem) { |
4ad49000 | 430 | r = cg_rmdir(cfrom, pfrom); |
246aa6dd LP |
431 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
432 | return r; | |
433 | } | |
8c6db833 LP |
434 | |
435 | return ret; | |
436 | } | |
437 | ||
3474ae3c LP |
438 | static const char *normalize_controller(const char *controller) { |
439 | ||
7027ff61 LP |
440 | assert(controller); |
441 | ||
3474ae3c LP |
442 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
443 | return "systemd"; | |
444 | else if (startswith(controller, "name=")) | |
445 | return controller + 5; | |
446 | else | |
447 | return controller; | |
448 | } | |
449 | ||
450 | static int join_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
018ef268 | 451 | char *t = NULL; |
3474ae3c | 452 | |
9444b1f2 LP |
453 | if (!isempty(controller)) { |
454 | if (!isempty(path) && !isempty(suffix)) | |
b7def684 | 455 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL); |
9444b1f2 | 456 | else if (!isempty(path)) |
b7def684 | 457 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL); |
9444b1f2 | 458 | else if (!isempty(suffix)) |
b7def684 | 459 | t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL); |
c3175a7f | 460 | else |
7027ff61 | 461 | t = strappend("/sys/fs/cgroup/", controller); |
c3175a7f | 462 | } else { |
9444b1f2 | 463 | if (!isempty(path) && !isempty(suffix)) |
b7def684 | 464 | t = strjoin(path, "/", suffix, NULL); |
9444b1f2 | 465 | else if (!isempty(path)) |
c3175a7f | 466 | t = strdup(path); |
7027ff61 LP |
467 | else |
468 | return -EINVAL; | |
c3175a7f | 469 | } |
3474ae3c LP |
470 | |
471 | if (!t) | |
472 | return -ENOMEM; | |
473 | ||
474 | path_kill_slashes(t); | |
475 | ||
476 | *fs = t; | |
477 | return 0; | |
478 | } | |
479 | ||
8c6db833 | 480 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { |
dbd821ac | 481 | const char *p; |
0ac10822 | 482 | static __thread bool good = false; |
8c6db833 | 483 | |
dbd821ac LP |
484 | assert(fs); |
485 | ||
78edb35a LP |
486 | if (controller && !cg_controller_is_valid(controller, true)) |
487 | return -EINVAL; | |
488 | ||
3bfc7184 | 489 | if (_unlikely_(!good)) { |
70132bd0 LP |
490 | int r; |
491 | ||
0c85a4f3 | 492 | r = path_is_mount_point("/sys/fs/cgroup", false); |
70132bd0 LP |
493 | if (r <= 0) |
494 | return r < 0 ? r : -ENOENT; | |
495 | ||
496 | /* Cache this to save a few stat()s */ | |
497 | good = true; | |
498 | } | |
499 | ||
c3175a7f | 500 | p = controller ? normalize_controller(controller) : NULL; |
7027ff61 | 501 | |
3474ae3c LP |
502 | return join_path(p, path, suffix, fs); |
503 | } | |
dbd821ac | 504 | |
7027ff61 | 505 | static int check_hierarchy(const char *p) { |
37099707 LP |
506 | char *cc; |
507 | ||
508 | assert(p); | |
509 | ||
510 | /* Check if this controller actually really exists */ | |
511 | cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p)); | |
512 | strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p); | |
513 | if (access(cc, F_OK) < 0) | |
514 | return -errno; | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
3474ae3c LP |
519 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { |
520 | const char *p; | |
37099707 | 521 | int r; |
dbd821ac | 522 | |
3474ae3c | 523 | assert(fs); |
70132bd0 | 524 | |
78edb35a | 525 | if (!cg_controller_is_valid(controller, true)) |
3474ae3c | 526 | return -EINVAL; |
70132bd0 | 527 | |
37099707 | 528 | /* Normalize the controller syntax */ |
3474ae3c | 529 | p = normalize_controller(controller); |
8c6db833 | 530 | |
3474ae3c | 531 | /* Check if this controller actually really exists */ |
7027ff61 | 532 | r = check_hierarchy(p); |
37099707 LP |
533 | if (r < 0) |
534 | return r; | |
3474ae3c LP |
535 | |
536 | return join_path(p, path, suffix, fs); | |
8c6db833 LP |
537 | } |
538 | ||
e27796a0 | 539 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { |
4ad49000 LP |
540 | assert(path); |
541 | assert(sb); | |
542 | assert(ftwbuf); | |
e27796a0 LP |
543 | |
544 | if (typeflag != FTW_DP) | |
545 | return 0; | |
546 | ||
547 | if (ftwbuf->level < 1) | |
548 | return 0; | |
549 | ||
e27796a0 LP |
550 | rmdir(path); |
551 | return 0; | |
552 | } | |
553 | ||
8c6db833 | 554 | int cg_trim(const char *controller, const char *path, bool delete_root) { |
7027ff61 | 555 | _cleanup_free_ char *fs = NULL; |
e27796a0 | 556 | int r = 0; |
8c6db833 | 557 | |
8c6db833 LP |
558 | assert(path); |
559 | ||
e27796a0 LP |
560 | r = cg_get_path(controller, path, NULL, &fs); |
561 | if (r < 0) | |
8c6db833 LP |
562 | return r; |
563 | ||
e27796a0 | 564 | errno = 0; |
7027ff61 | 565 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) |
e27796a0 LP |
566 | r = errno ? -errno : -EIO; |
567 | ||
568 | if (delete_root) { | |
4ad49000 LP |
569 | if (rmdir(fs) < 0 && errno != ENOENT) |
570 | return -errno; | |
e27796a0 LP |
571 | } |
572 | ||
e27796a0 | 573 | return r; |
8c6db833 LP |
574 | } |
575 | ||
576 | int cg_delete(const char *controller, const char *path) { | |
7027ff61 | 577 | _cleanup_free_ char *parent = NULL; |
8c6db833 LP |
578 | int r; |
579 | ||
8c6db833 LP |
580 | assert(path); |
581 | ||
7027ff61 LP |
582 | r = path_get_parent(path, &parent); |
583 | if (r < 0) | |
35d2e7ec | 584 | return r; |
8c6db833 | 585 | |
246aa6dd | 586 | r = cg_migrate_recursive(controller, path, controller, parent, false, true); |
4c633005 | 587 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
588 | } |
589 | ||
8c6db833 | 590 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
574d5f2d LP |
591 | _cleanup_free_ char *fs = NULL; |
592 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
8c6db833 LP |
593 | int r; |
594 | ||
8c6db833 LP |
595 | assert(path); |
596 | assert(pid >= 0); | |
597 | ||
b043cd0b | 598 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
3474ae3c | 599 | if (r < 0) |
c6c18be3 | 600 | return r; |
8c6db833 LP |
601 | |
602 | if (pid == 0) | |
603 | pid = getpid(); | |
604 | ||
c6c18be3 | 605 | snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid); |
8c6db833 | 606 | |
574d5f2d | 607 | return write_string_file(fs, c); |
8c6db833 LP |
608 | } |
609 | ||
2d76d14e LP |
610 | int cg_set_group_access( |
611 | const char *controller, | |
612 | const char *path, | |
613 | mode_t mode, | |
614 | uid_t uid, | |
615 | gid_t gid) { | |
616 | ||
574d5f2d | 617 | _cleanup_free_ char *fs = NULL; |
8c6db833 LP |
618 | int r; |
619 | ||
8c6db833 LP |
620 | assert(path); |
621 | ||
8d53b453 LP |
622 | if (mode != (mode_t) -1) |
623 | mode &= 0777; | |
624 | ||
625 | r = cg_get_path(controller, path, NULL, &fs); | |
626 | if (r < 0) | |
8c6db833 LP |
627 | return r; |
628 | ||
574d5f2d | 629 | return chmod_and_chown(fs, mode, uid, gid); |
8c6db833 LP |
630 | } |
631 | ||
974efc46 LP |
632 | int cg_set_task_access( |
633 | const char *controller, | |
634 | const char *path, | |
635 | mode_t mode, | |
636 | uid_t uid, | |
4ad49000 | 637 | gid_t gid) { |
974efc46 LP |
638 | |
639 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
8c6db833 LP |
640 | int r; |
641 | ||
8c6db833 LP |
642 | assert(path); |
643 | ||
4ad49000 | 644 | if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1) |
8d53b453 LP |
645 | return 0; |
646 | ||
647 | if (mode != (mode_t) -1) | |
648 | mode &= 0666; | |
649 | ||
b043cd0b | 650 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
8d53b453 | 651 | if (r < 0) |
8c6db833 LP |
652 | return r; |
653 | ||
654 | r = chmod_and_chown(fs, mode, uid, gid); | |
974efc46 LP |
655 | if (r < 0) |
656 | return r; | |
8c6db833 | 657 | |
b043cd0b LP |
658 | /* Compatibility, Always keep values for "tasks" in sync with |
659 | * "cgroup.procs" */ | |
660 | r = cg_get_path(controller, path, "tasks", &procs); | |
974efc46 LP |
661 | if (r < 0) |
662 | return r; | |
663 | ||
664 | return chmod_and_chown(procs, mode, uid, gid); | |
8c6db833 LP |
665 | } |
666 | ||
7027ff61 | 667 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { |
7027ff61 LP |
668 | _cleanup_fclose_ FILE *f = NULL; |
669 | char line[LINE_MAX]; | |
8af8afd6 | 670 | const char *fs; |
c6c18be3 | 671 | size_t cs; |
8c6db833 | 672 | |
8c6db833 | 673 | assert(path); |
c6c18be3 | 674 | assert(pid >= 0); |
8c6db833 | 675 | |
8af8afd6 LP |
676 | if (controller) { |
677 | if (!cg_controller_is_valid(controller, true)) | |
678 | return -EINVAL; | |
78edb35a | 679 | |
8af8afd6 LP |
680 | controller = normalize_controller(controller); |
681 | } else | |
7027ff61 LP |
682 | controller = SYSTEMD_CGROUP_CONTROLLER; |
683 | ||
c6c18be3 | 684 | if (pid == 0) |
8af8afd6 LP |
685 | fs = "/proc/self/cgroup"; |
686 | else | |
687 | fs = procfs_file_alloca(pid, "cgroup"); | |
8c6db833 | 688 | |
c6c18be3 | 689 | f = fopen(fs, "re"); |
4c633005 LP |
690 | if (!f) |
691 | return errno == ENOENT ? -ESRCH : -errno; | |
692 | ||
c6c18be3 LP |
693 | cs = strlen(controller); |
694 | ||
7027ff61 | 695 | FOREACH_LINE(line, f, return -errno) { |
8af8afd6 LP |
696 | char *l, *p, *w, *e; |
697 | size_t k; | |
698 | char *state; | |
699 | bool found = false; | |
c6c18be3 LP |
700 | |
701 | truncate_nl(line); | |
702 | ||
7027ff61 LP |
703 | l = strchr(line, ':'); |
704 | if (!l) | |
c6c18be3 LP |
705 | continue; |
706 | ||
707 | l++; | |
8af8afd6 LP |
708 | e = strchr(l, ':'); |
709 | if (!e) | |
c6c18be3 LP |
710 | continue; |
711 | ||
8af8afd6 LP |
712 | *e = 0; |
713 | ||
714 | FOREACH_WORD_SEPARATOR(w, k, l, ",", state) { | |
715 | ||
716 | if (k == cs && memcmp(w, controller, cs) == 0) { | |
717 | found = true; | |
718 | break; | |
719 | } | |
720 | ||
721 | if (k == 5 + cs && | |
722 | memcmp(w, "name=", 5) == 0 && | |
723 | memcmp(w+5, controller, cs) == 0) { | |
724 | found = true; | |
725 | break; | |
726 | } | |
727 | } | |
728 | ||
729 | if (!found) | |
c6c18be3 LP |
730 | continue; |
731 | ||
8af8afd6 | 732 | p = strdup(e + 1); |
7027ff61 LP |
733 | if (!p) |
734 | return -ENOMEM; | |
c6c18be3 LP |
735 | |
736 | *path = p; | |
7027ff61 | 737 | return 0; |
c6c18be3 LP |
738 | } |
739 | ||
7027ff61 | 740 | return -ENOENT; |
8c6db833 LP |
741 | } |
742 | ||
743 | int cg_install_release_agent(const char *controller, const char *agent) { | |
7027ff61 LP |
744 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
745 | char *sc; | |
8c6db833 LP |
746 | int r; |
747 | ||
8c6db833 LP |
748 | assert(agent); |
749 | ||
7027ff61 LP |
750 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
751 | if (r < 0) | |
c6c18be3 | 752 | return r; |
8c6db833 | 753 | |
7027ff61 LP |
754 | r = read_one_line_file(fs, &contents); |
755 | if (r < 0) | |
756 | return r; | |
8c6db833 LP |
757 | |
758 | sc = strstrip(contents); | |
8c6db833 | 759 | if (sc[0] == 0) { |
7027ff61 | 760 | r = write_string_file(fs, agent); |
574d5f2d | 761 | if (r < 0) |
7027ff61 LP |
762 | return r; |
763 | } else if (!streq(sc, agent)) | |
764 | return -EEXIST; | |
8c6db833 | 765 | |
c6c18be3 LP |
766 | free(fs); |
767 | fs = NULL; | |
7027ff61 LP |
768 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
769 | if (r < 0) | |
770 | return r; | |
8c6db833 LP |
771 | |
772 | free(contents); | |
773 | contents = NULL; | |
7027ff61 LP |
774 | r = read_one_line_file(fs, &contents); |
775 | if (r < 0) | |
776 | return r; | |
8c6db833 LP |
777 | |
778 | sc = strstrip(contents); | |
8c6db833 | 779 | if (streq(sc, "0")) { |
7027ff61 LP |
780 | r = write_string_file(fs, "1"); |
781 | if (r < 0) | |
782 | return r; | |
c6c18be3 | 783 | |
7027ff61 LP |
784 | return 1; |
785 | } | |
8c6db833 | 786 | |
7027ff61 LP |
787 | if (!streq(sc, "1")) |
788 | return -EIO; | |
8c6db833 | 789 | |
7027ff61 | 790 | return 0; |
8c6db833 LP |
791 | } |
792 | ||
793 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { | |
7027ff61 | 794 | _cleanup_fclose_ FILE *f = NULL; |
c3175a7f | 795 | pid_t pid = 0, self_pid; |
c6c18be3 | 796 | bool found = false; |
7027ff61 | 797 | int r; |
8c6db833 | 798 | |
8c6db833 LP |
799 | assert(path); |
800 | ||
b043cd0b | 801 | r = cg_enumerate_processes(controller, path, &f); |
c3175a7f | 802 | if (r < 0) |
4c633005 | 803 | return r == -ENOENT ? 1 : r; |
8c6db833 | 804 | |
c3175a7f LP |
805 | self_pid = getpid(); |
806 | ||
c6c18be3 | 807 | while ((r = cg_read_pid(f, &pid)) > 0) { |
8c6db833 | 808 | |
c3175a7f | 809 | if (ignore_self && pid == self_pid) |
c6c18be3 | 810 | continue; |
8c6db833 | 811 | |
c6c18be3 LP |
812 | found = true; |
813 | break; | |
8c6db833 LP |
814 | } |
815 | ||
c6c18be3 LP |
816 | if (r < 0) |
817 | return r; | |
8c6db833 | 818 | |
c6c18be3 | 819 | return !found; |
8c6db833 LP |
820 | } |
821 | ||
b08121d0 | 822 | int cg_is_empty_by_spec(const char *spec, bool ignore_self) { |
b08121d0 | 823 | _cleanup_free_ char *controller = NULL, *path = NULL; |
7027ff61 | 824 | int r; |
b08121d0 LP |
825 | |
826 | assert(spec); | |
827 | ||
828 | r = cg_split_spec(spec, &controller, &path); | |
829 | if (r < 0) | |
830 | return r; | |
831 | ||
832 | return cg_is_empty(controller, path, ignore_self); | |
833 | } | |
834 | ||
8c6db833 | 835 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { |
7027ff61 | 836 | _cleanup_closedir_ DIR *d = NULL; |
35d2e7ec | 837 | char *fn; |
7027ff61 | 838 | int r; |
8c6db833 | 839 | |
8c6db833 LP |
840 | assert(path); |
841 | ||
c3175a7f LP |
842 | r = cg_is_empty(controller, path, ignore_self); |
843 | if (r <= 0) | |
35d2e7ec LP |
844 | return r; |
845 | ||
c3175a7f LP |
846 | r = cg_enumerate_subgroups(controller, path, &d); |
847 | if (r < 0) | |
4c633005 | 848 | return r == -ENOENT ? 1 : r; |
8c6db833 | 849 | |
35d2e7ec | 850 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
7027ff61 | 851 | _cleanup_free_ char *p = NULL; |
8c6db833 | 852 | |
7027ff61 | 853 | p = strjoin(path, "/", fn, NULL); |
35d2e7ec | 854 | free(fn); |
7027ff61 LP |
855 | if (!p) |
856 | return -ENOMEM; | |
8c6db833 | 857 | |
35d2e7ec | 858 | r = cg_is_empty_recursive(controller, p, ignore_self); |
35d2e7ec | 859 | if (r <= 0) |
7027ff61 | 860 | return r; |
35d2e7ec LP |
861 | } |
862 | ||
7027ff61 LP |
863 | if (r < 0) |
864 | return r; | |
35d2e7ec | 865 | |
7027ff61 | 866 | return 1; |
35d2e7ec LP |
867 | } |
868 | ||
869 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
870 | const char *e; | |
871 | char *t = NULL, *u = NULL; | |
5954c074 | 872 | _cleanup_free_ char *v = NULL; |
35d2e7ec LP |
873 | |
874 | assert(spec); | |
35d2e7ec LP |
875 | |
876 | if (*spec == '/') { | |
e884315e LP |
877 | if (!path_is_safe(spec)) |
878 | return -EINVAL; | |
35d2e7ec LP |
879 | |
880 | if (path) { | |
246aa6dd LP |
881 | t = strdup(spec); |
882 | if (!t) | |
35d2e7ec LP |
883 | return -ENOMEM; |
884 | ||
5954c074 | 885 | path_kill_slashes(t); |
35d2e7ec | 886 | *path = t; |
8c6db833 LP |
887 | } |
888 | ||
35d2e7ec LP |
889 | if (controller) |
890 | *controller = NULL; | |
891 | ||
892 | return 0; | |
8c6db833 LP |
893 | } |
894 | ||
246aa6dd LP |
895 | e = strchr(spec, ':'); |
896 | if (!e) { | |
78edb35a | 897 | if (!cg_controller_is_valid(spec, true)) |
35d2e7ec LP |
898 | return -EINVAL; |
899 | ||
900 | if (controller) { | |
5954c074 | 901 | t = strdup(normalize_controller(spec)); |
246aa6dd | 902 | if (!t) |
35d2e7ec LP |
903 | return -ENOMEM; |
904 | ||
905 | *controller = t; | |
906 | } | |
907 | ||
908 | if (path) | |
909 | *path = NULL; | |
910 | ||
911 | return 0; | |
8c6db833 LP |
912 | } |
913 | ||
5954c074 LP |
914 | v = strndup(spec, e-spec); |
915 | if (!v) | |
916 | return -ENOMEM; | |
917 | t = strdup(normalize_controller(v)); | |
e884315e LP |
918 | if (!t) |
919 | return -ENOMEM; | |
78edb35a | 920 | if (!cg_controller_is_valid(t, true)) { |
e884315e | 921 | free(t); |
35d2e7ec | 922 | return -EINVAL; |
246aa6dd LP |
923 | } |
924 | ||
e884315e LP |
925 | u = strdup(e+1); |
926 | if (!u) { | |
927 | free(t); | |
928 | return -ENOMEM; | |
929 | } | |
5954c074 LP |
930 | if (!path_is_safe(u) || |
931 | !path_is_absolute(u)) { | |
e884315e LP |
932 | free(t); |
933 | free(u); | |
934 | return -EINVAL; | |
246aa6dd | 935 | } |
35d2e7ec | 936 | |
5954c074 LP |
937 | path_kill_slashes(u); |
938 | ||
35d2e7ec LP |
939 | if (controller) |
940 | *controller = t; | |
e884315e LP |
941 | else |
942 | free(t); | |
35d2e7ec LP |
943 | |
944 | if (path) | |
945 | *path = u; | |
e884315e LP |
946 | else |
947 | free(u); | |
35d2e7ec LP |
948 | |
949 | return 0; | |
8c6db833 | 950 | } |
c6c18be3 | 951 | |
35d2e7ec | 952 | int cg_join_spec(const char *controller, const char *path, char **spec) { |
7027ff61 LP |
953 | char *s; |
954 | ||
35d2e7ec | 955 | assert(path); |
c6c18be3 | 956 | |
7027ff61 LP |
957 | if (!controller) |
958 | controller = "systemd"; | |
78edb35a LP |
959 | else { |
960 | if (!cg_controller_is_valid(controller, true)) | |
961 | return -EINVAL; | |
962 | ||
963 | controller = normalize_controller(controller); | |
964 | } | |
35d2e7ec | 965 | |
7027ff61 LP |
966 | if (!path_is_absolute(path)) |
967 | return -EINVAL; | |
968 | ||
7027ff61 LP |
969 | s = strjoin(controller, ":", path, NULL); |
970 | if (!s) | |
35d2e7ec | 971 | return -ENOMEM; |
c6c18be3 | 972 | |
5954c074 LP |
973 | path_kill_slashes(s + strlen(controller) + 1); |
974 | ||
7027ff61 | 975 | *spec = s; |
c6c18be3 LP |
976 | return 0; |
977 | } | |
35d2e7ec | 978 | |
7027ff61 | 979 | int cg_mangle_path(const char *path, char **result) { |
78edb35a LP |
980 | _cleanup_free_ char *c = NULL, *p = NULL; |
981 | char *t; | |
35d2e7ec LP |
982 | int r; |
983 | ||
984 | assert(path); | |
985 | assert(result); | |
986 | ||
987 | /* First check if it already is a filesystem path */ | |
7027ff61 | 988 | if (path_startswith(path, "/sys/fs/cgroup")) { |
35d2e7ec | 989 | |
b69d29ce LP |
990 | t = strdup(path); |
991 | if (!t) | |
35d2e7ec LP |
992 | return -ENOMEM; |
993 | ||
5954c074 | 994 | path_kill_slashes(t); |
35d2e7ec LP |
995 | *result = t; |
996 | return 0; | |
997 | } | |
998 | ||
999 | /* Otherwise treat it as cg spec */ | |
b69d29ce LP |
1000 | r = cg_split_spec(path, &c, &p); |
1001 | if (r < 0) | |
35d2e7ec LP |
1002 | return r; |
1003 | ||
78edb35a | 1004 | return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); |
35d2e7ec | 1005 | } |
1f73f0f1 | 1006 | |
7027ff61 | 1007 | int cg_get_root_path(char **path) { |
9444b1f2 | 1008 | char *p, *e; |
7027ff61 LP |
1009 | int r; |
1010 | ||
1011 | assert(path); | |
1012 | ||
9444b1f2 | 1013 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1014 | if (r < 0) |
1015 | return r; | |
1016 | ||
9444b1f2 LP |
1017 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); |
1018 | if (e) | |
7027ff61 LP |
1019 | *e = 0; |
1020 | ||
1f73f0f1 LP |
1021 | *path = p; |
1022 | return 0; | |
1023 | } | |
b59e2465 LP |
1024 | |
1025 | char **cg_shorten_controllers(char **controllers) { | |
1026 | char **f, **t; | |
1027 | ||
b59e2465 LP |
1028 | if (!controllers) |
1029 | return controllers; | |
1030 | ||
1031 | for (f = controllers, t = controllers; *f; f++) { | |
37099707 | 1032 | const char *p; |
7027ff61 LP |
1033 | int r; |
1034 | ||
1035 | p = normalize_controller(*f); | |
b59e2465 | 1036 | |
78edb35a LP |
1037 | if (streq(p, "systemd")) { |
1038 | free(*f); | |
1039 | continue; | |
1040 | } | |
1041 | ||
1042 | if (!cg_controller_is_valid(p, true)) { | |
1043 | log_warning("Controller %s is not valid, removing from controllers list.", p); | |
b59e2465 LP |
1044 | free(*f); |
1045 | continue; | |
1046 | } | |
1047 | ||
7027ff61 | 1048 | r = check_hierarchy(p); |
37099707 | 1049 | if (r < 0) { |
78edb35a | 1050 | log_debug("Controller %s is not available, removing from controllers list.", p); |
b59e2465 LP |
1051 | free(*f); |
1052 | continue; | |
1053 | } | |
1054 | ||
1055 | *(t++) = *f; | |
1056 | } | |
1057 | ||
1058 | *t = NULL; | |
6c03089c | 1059 | return strv_uniq(controllers); |
b59e2465 | 1060 | } |
ba1261bc | 1061 | |
7027ff61 LP |
1062 | int cg_pid_get_path_shifted(pid_t pid, char **root, char **cgroup) { |
1063 | _cleanup_free_ char *cg_root = NULL; | |
1064 | char *cg_process, *p; | |
ba1261bc LP |
1065 | int r; |
1066 | ||
7027ff61 | 1067 | r = cg_get_root_path(&cg_root); |
ba1261bc LP |
1068 | if (r < 0) |
1069 | return r; | |
1070 | ||
7027ff61 LP |
1071 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process); |
1072 | if (r < 0) | |
ba1261bc | 1073 | return r; |
ba1261bc | 1074 | |
7027ff61 LP |
1075 | p = path_startswith(cg_process, cg_root); |
1076 | if (p) | |
1077 | p--; | |
1078 | else | |
1079 | p = cg_process; | |
ba1261bc LP |
1080 | |
1081 | if (cgroup) { | |
1082 | char* c; | |
1083 | ||
1084 | c = strdup(p); | |
1085 | if (!c) { | |
1086 | free(cg_process); | |
1087 | return -ENOMEM; | |
1088 | } | |
1089 | ||
1090 | *cgroup = c; | |
1091 | } | |
1092 | ||
1093 | if (root) { | |
1094 | cg_process[p-cg_process] = 0; | |
1095 | *root = cg_process; | |
1096 | } else | |
1097 | free(cg_process); | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
7027ff61 | 1102 | int cg_path_decode_unit(const char *cgroup, char **unit){ |
6c03089c | 1103 | char *p, *e, *c, *s, *k; |
ef1673d1 MT |
1104 | |
1105 | assert(cgroup); | |
6c03089c | 1106 | assert(unit); |
ef1673d1 | 1107 | |
6c03089c LP |
1108 | e = strchrnul(cgroup, '/'); |
1109 | c = strndupa(cgroup, e - cgroup); | |
ae018d9b | 1110 | c = cg_unescape(c); |
ef1673d1 | 1111 | |
6c03089c LP |
1112 | /* Could this be a valid unit name? */ |
1113 | if (!unit_name_is_valid(c, true)) | |
1114 | return -EINVAL; | |
ef1673d1 | 1115 | |
6c03089c LP |
1116 | if (!unit_name_is_template(c)) |
1117 | s = strdup(c); | |
1118 | else { | |
1119 | if (*e != '/') | |
96cde13a | 1120 | return -EINVAL; |
ef1673d1 | 1121 | |
6c03089c | 1122 | e += strspn(e, "/"); |
ae018d9b | 1123 | |
6c03089c | 1124 | p = strchrnul(e, '/'); |
ae018d9b LP |
1125 | k = strndupa(e, p - e); |
1126 | k = cg_unescape(k); | |
ef1673d1 | 1127 | |
ae018d9b | 1128 | if (!unit_name_is_valid(k, false)) |
6c03089c LP |
1129 | return -EINVAL; |
1130 | ||
ae018d9b | 1131 | s = strdup(k); |
ef1673d1 MT |
1132 | } |
1133 | ||
6c03089c LP |
1134 | if (!s) |
1135 | return -ENOMEM; | |
1136 | ||
1137 | *unit = s; | |
ef1673d1 MT |
1138 | return 0; |
1139 | } | |
1140 | ||
9444b1f2 | 1141 | static const char *skip_slices(const char *p) { |
9444b1f2 LP |
1142 | /* Skips over all slice assignments */ |
1143 | ||
1144 | for (;;) { | |
1021b21b LP |
1145 | size_t n; |
1146 | ||
9444b1f2 LP |
1147 | p += strspn(p, "/"); |
1148 | ||
1149 | n = strcspn(p, "/"); | |
1150 | if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) | |
1151 | return p; | |
1152 | ||
1153 | p += n; | |
1154 | } | |
1155 | } | |
1156 | ||
6c03089c LP |
1157 | int cg_path_get_unit(const char *path, char **unit) { |
1158 | const char *e; | |
1159 | ||
1160 | assert(path); | |
1161 | assert(unit); | |
1162 | ||
9444b1f2 | 1163 | e = skip_slices(path); |
6c03089c | 1164 | |
7027ff61 | 1165 | return cg_path_decode_unit(e, unit); |
6c03089c LP |
1166 | } |
1167 | ||
1168 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
7fd1b19b | 1169 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1170 | int r; |
ba1261bc | 1171 | |
ef1673d1 MT |
1172 | assert(unit); |
1173 | ||
7027ff61 | 1174 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1175 | if (r < 0) |
1176 | return r; | |
1177 | ||
6c03089c LP |
1178 | return cg_path_get_unit(cgroup, unit); |
1179 | } | |
ef1673d1 | 1180 | |
9444b1f2 LP |
1181 | static const char *skip_user(const char *p) { |
1182 | size_t n; | |
ef1673d1 | 1183 | |
9444b1f2 LP |
1184 | assert(p); |
1185 | ||
1186 | p += strspn(p, "/"); | |
1187 | ||
1188 | n = strcspn(p, "/"); | |
1189 | if (n <= 5 || memcmp(p + n - 5, ".user", 5) != 0) | |
1190 | return p; | |
1191 | ||
1192 | p += n; | |
1193 | p += strspn(p, "/"); | |
1194 | ||
1195 | return p; | |
1196 | } | |
1197 | ||
1198 | static const char *skip_session(const char *p) { | |
1199 | size_t n; | |
1200 | ||
1201 | assert(p); | |
1202 | ||
1203 | p += strspn(p, "/"); | |
1204 | ||
1205 | n = strcspn(p, "/"); | |
1206 | if (n <= 8 || memcmp(p + n - 8, ".session", 8) != 0) | |
6c03089c | 1207 | return NULL; |
ef1673d1 | 1208 | |
9444b1f2 LP |
1209 | p += n; |
1210 | p += strspn(p, "/"); | |
1211 | ||
1212 | return p; | |
1213 | } | |
1214 | ||
1215 | static const char *skip_systemd_label(const char *p) { | |
1216 | size_t n; | |
1217 | ||
1218 | assert(p); | |
1219 | ||
1220 | p += strspn(p, "/"); | |
1221 | ||
1222 | n = strcspn(p, "/"); | |
1223 | if (n < 8 || memcmp(p, "systemd-", 8) != 0) | |
1224 | return p; | |
1225 | ||
1226 | p += n; | |
1227 | p += strspn(p, "/"); | |
1228 | ||
1229 | return p; | |
ef1673d1 MT |
1230 | } |
1231 | ||
6c03089c LP |
1232 | int cg_path_get_user_unit(const char *path, char **unit) { |
1233 | const char *e; | |
ef1673d1 | 1234 | |
6c03089c | 1235 | assert(path); |
ba1261bc LP |
1236 | assert(unit); |
1237 | ||
6c03089c LP |
1238 | /* We always have to parse the path from the beginning as unit |
1239 | * cgroups might have arbitrary child cgroups and we shouldn't get | |
1240 | * confused by those */ | |
ba1261bc | 1241 | |
9444b1f2 LP |
1242 | /* Skip slices, if there are any */ |
1243 | e = skip_slices(path); | |
ba1261bc | 1244 | |
9444b1f2 LP |
1245 | /* Skip the user name, if there is one */ |
1246 | e = skip_user(e); | |
ba1261bc | 1247 | |
9444b1f2 LP |
1248 | /* Skip the session ID, require that there is one */ |
1249 | e = skip_session(e); | |
6c03089c LP |
1250 | if (!e) |
1251 | return -ENOENT; | |
1252 | ||
9444b1f2 LP |
1253 | /* Skip the systemd cgroup, if there is one */ |
1254 | e = skip_systemd_label(e); | |
6c03089c | 1255 | |
7027ff61 | 1256 | return cg_path_decode_unit(e, unit); |
ef1673d1 | 1257 | } |
ba1261bc | 1258 | |
ef1673d1 | 1259 | int cg_pid_get_user_unit(pid_t pid, char **unit) { |
7fd1b19b | 1260 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1261 | int r; |
1262 | ||
1263 | assert(unit); | |
1264 | ||
7027ff61 | 1265 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1266 | if (r < 0) |
1267 | return r; | |
1268 | ||
1269 | return cg_path_get_user_unit(cgroup, unit); | |
ba1261bc | 1270 | } |
e884315e | 1271 | |
7027ff61 | 1272 | int cg_path_get_machine_name(const char *path, char **machine) { |
9444b1f2 | 1273 | const char *e, *n, *x; |
ae018d9b | 1274 | char *s, *r; |
7027ff61 LP |
1275 | |
1276 | assert(path); | |
1277 | assert(machine); | |
1278 | ||
9444b1f2 LP |
1279 | /* Skip slices, if there are any */ |
1280 | e = skip_slices(path); | |
7027ff61 LP |
1281 | |
1282 | n = strchrnul(e, '/'); | |
1283 | if (e == n) | |
1284 | return -ENOENT; | |
1285 | ||
ae018d9b | 1286 | s = strndupa(e, n - e); |
9444b1f2 LP |
1287 | s = cg_unescape(s); |
1288 | ||
1289 | x = endswith(s, ".machine"); | |
1290 | if (!x) | |
1291 | return -ENOENT; | |
7027ff61 | 1292 | |
9444b1f2 | 1293 | r = strndup(s, x - s); |
ae018d9b LP |
1294 | if (!r) |
1295 | return -ENOMEM; | |
aff38e74 | 1296 | |
ae018d9b | 1297 | *machine = r; |
7027ff61 LP |
1298 | return 0; |
1299 | } | |
1300 | ||
1301 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
7fd1b19b | 1302 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1303 | int r; |
1304 | ||
1305 | assert(machine); | |
1306 | ||
1307 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1308 | if (r < 0) | |
1309 | return r; | |
1310 | ||
1311 | return cg_path_get_machine_name(cgroup, machine); | |
1312 | } | |
1313 | ||
1314 | int cg_path_get_session(const char *path, char **session) { | |
1315 | const char *e, *n; | |
1316 | char *s; | |
1317 | ||
1318 | assert(path); | |
1319 | assert(session); | |
1320 | ||
9444b1f2 LP |
1321 | /* Skip slices, if there are any */ |
1322 | e = skip_slices(path); | |
7027ff61 | 1323 | |
9444b1f2 LP |
1324 | /* Skip the user name, if there is one */ |
1325 | e = skip_user(e); | |
7027ff61 LP |
1326 | |
1327 | n = strchrnul(e, '/'); | |
ae018d9b | 1328 | if (n - e < 8) |
7027ff61 | 1329 | return -ENOENT; |
ae018d9b | 1330 | if (memcmp(n - 8, ".session", 8) != 0) |
7027ff61 LP |
1331 | return -ENOENT; |
1332 | ||
ae018d9b | 1333 | s = strndup(e, n - e - 8); |
7027ff61 LP |
1334 | if (!s) |
1335 | return -ENOMEM; | |
1336 | ||
1337 | *session = s; | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | int cg_pid_get_session(pid_t pid, char **session) { | |
7fd1b19b | 1342 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1343 | int r; |
1344 | ||
1345 | assert(session); | |
1346 | ||
1347 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1348 | if (r < 0) | |
1349 | return r; | |
1350 | ||
1351 | return cg_path_get_session(cgroup, session); | |
1352 | } | |
1353 | ||
ae018d9b LP |
1354 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { |
1355 | const char *e, *n; | |
1356 | char *s; | |
1357 | ||
1358 | assert(path); | |
1359 | assert(uid); | |
1360 | ||
9444b1f2 LP |
1361 | /* Skip slices, if there are any */ |
1362 | e = skip_slices(path); | |
ae018d9b LP |
1363 | |
1364 | n = strchrnul(e, '/'); | |
1365 | if (n - e < 5) | |
1366 | return -ENOENT; | |
1367 | if (memcmp(n - 5, ".user", 5) != 0) | |
1368 | return -ENOENT; | |
1369 | ||
1370 | s = strndupa(e, n - e - 5); | |
1371 | if (!s) | |
1372 | return -ENOMEM; | |
1373 | ||
1374 | return parse_uid(s, uid); | |
1375 | } | |
1376 | ||
1377 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1378 | _cleanup_free_ char *cgroup = NULL; | |
1379 | int r; | |
1380 | ||
1381 | assert(uid); | |
1382 | ||
1383 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1384 | if (r < 0) | |
1385 | return r; | |
1386 | ||
1387 | return cg_path_get_owner_uid(cgroup, uid); | |
1388 | } | |
1389 | ||
1021b21b LP |
1390 | int cg_path_get_slice(const char *p, char **slice) { |
1391 | const char *e = NULL; | |
1392 | size_t m = 0; | |
1393 | ||
1394 | assert(p); | |
1395 | assert(slice); | |
1396 | ||
1397 | for (;;) { | |
1398 | size_t n; | |
1399 | ||
1400 | p += strspn(p, "/"); | |
1401 | ||
1402 | n = strcspn(p, "/"); | |
1403 | if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) { | |
1404 | char *s; | |
1405 | ||
1406 | if (!e) | |
1407 | return -ENOENT; | |
1408 | ||
1409 | s = strndup(e, m); | |
1410 | if (!s) | |
1411 | return -ENOMEM; | |
1412 | ||
1413 | *slice = s; | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | e = p; | |
1418 | m = n; | |
1419 | ||
1420 | p += n; | |
1421 | } | |
1422 | } | |
1423 | ||
1424 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1425 | _cleanup_free_ char *cgroup = NULL; | |
1426 | int r; | |
1427 | ||
1428 | assert(slice); | |
1429 | ||
1430 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1431 | if (r < 0) | |
1432 | return r; | |
1433 | ||
1434 | return cg_path_get_slice(cgroup, slice); | |
1435 | } | |
1436 | ||
e884315e LP |
1437 | int cg_controller_from_attr(const char *attr, char **controller) { |
1438 | const char *dot; | |
1439 | char *c; | |
1440 | ||
1441 | assert(attr); | |
1442 | assert(controller); | |
1443 | ||
1444 | if (!filename_is_safe(attr)) | |
1445 | return -EINVAL; | |
1446 | ||
1447 | dot = strchr(attr, '.'); | |
1448 | if (!dot) { | |
1449 | *controller = NULL; | |
1450 | return 0; | |
1451 | } | |
1452 | ||
1453 | c = strndup(attr, dot - attr); | |
1454 | if (!c) | |
1455 | return -ENOMEM; | |
1456 | ||
78edb35a | 1457 | if (!cg_controller_is_valid(c, false)) { |
e884315e LP |
1458 | free(c); |
1459 | return -EINVAL; | |
1460 | } | |
1461 | ||
1462 | *controller = c; | |
1463 | return 1; | |
1464 | } | |
ae018d9b LP |
1465 | |
1466 | char *cg_escape(const char *p) { | |
1467 | bool need_prefix = false; | |
1468 | ||
1469 | /* This implements very minimal escaping for names to be used | |
1470 | * as file names in the cgroup tree: any name which might | |
1471 | * conflict with a kernel name or is prefixed with '_' is | |
1472 | * prefixed with a '_'. That way, when reading cgroup names it | |
1473 | * is sufficient to remove a single prefixing underscore if | |
1474 | * there is one. */ | |
1475 | ||
1476 | /* The return value of this function (unlike cg_unescape()) | |
1477 | * needs free()! */ | |
1478 | ||
a0ab5665 LP |
1479 | if (p[0] == 0 || |
1480 | p[0] == '_' || | |
1481 | p[0] == '.' || | |
1482 | streq(p, "notify_on_release") || | |
1483 | streq(p, "release_agent") || | |
1484 | streq(p, "tasks")) | |
ae018d9b LP |
1485 | need_prefix = true; |
1486 | else { | |
1487 | const char *dot; | |
1488 | ||
1489 | dot = strrchr(p, '.'); | |
1490 | if (dot) { | |
1491 | ||
1492 | if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0) | |
1493 | need_prefix = true; | |
1494 | else { | |
1495 | char *n; | |
1496 | ||
1497 | n = strndupa(p, dot - p); | |
1498 | ||
1499 | if (check_hierarchy(n) >= 0) | |
1500 | need_prefix = true; | |
1501 | } | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | if (need_prefix) | |
1506 | return strappend("_", p); | |
1507 | else | |
1508 | return strdup(p); | |
1509 | } | |
1510 | ||
1511 | char *cg_unescape(const char *p) { | |
1512 | assert(p); | |
1513 | ||
1514 | /* The return value of this function (unlike cg_escape()) | |
1515 | * doesn't need free()! */ | |
1516 | ||
1517 | if (p[0] == '_') | |
1518 | return (char*) p+1; | |
1519 | ||
1520 | return (char*) p; | |
1521 | } | |
78edb35a LP |
1522 | |
1523 | #define CONTROLLER_VALID \ | |
1524 | "0123456789" \ | |
1525 | "abcdefghijklmnopqrstuvwxyz" \ | |
1526 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \ | |
1527 | "_" | |
1528 | ||
1529 | bool cg_controller_is_valid(const char *p, bool allow_named) { | |
1530 | const char *t, *s; | |
1531 | ||
1532 | if (!p) | |
1533 | return false; | |
1534 | ||
1535 | if (allow_named) { | |
1536 | s = startswith(p, "name="); | |
1537 | if (s) | |
1538 | p = s; | |
1539 | } | |
1540 | ||
1541 | if (*p == 0 || *p == '_') | |
1542 | return false; | |
1543 | ||
1544 | for (t = p; *t; t++) | |
1545 | if (!strchr(CONTROLLER_VALID, *t)) | |
1546 | return false; | |
1547 | ||
1548 | if (t - p > FILENAME_MAX) | |
1549 | return false; | |
1550 | ||
1551 | return true; | |
1552 | } | |
a016b922 LP |
1553 | |
1554 | int cg_slice_to_path(const char *unit, char **ret) { | |
1555 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1556 | const char *dash; | |
1557 | ||
1558 | assert(unit); | |
1559 | assert(ret); | |
1560 | ||
1561 | if (!unit_name_is_valid(unit, false)) | |
1562 | return -EINVAL; | |
1563 | ||
1564 | if (!endswith(unit, ".slice")) | |
1565 | return -EINVAL; | |
1566 | ||
1567 | p = unit_name_to_prefix(unit); | |
1568 | if (!p) | |
1569 | return -ENOMEM; | |
1570 | ||
1571 | dash = strchr(p, '-'); | |
1572 | while (dash) { | |
1573 | _cleanup_free_ char *escaped = NULL; | |
1574 | char n[dash - p + sizeof(".slice")]; | |
1575 | ||
1576 | strcpy(stpncpy(n, p, dash - p), ".slice"); | |
1577 | ||
1578 | if (!unit_name_is_valid(n, false)) | |
1579 | return -EINVAL; | |
1580 | ||
1581 | escaped = cg_escape(n); | |
1582 | if (!escaped) | |
1583 | return -ENOMEM; | |
1584 | ||
1585 | if (!strextend(&s, escaped, "/", NULL)) | |
1586 | return -ENOMEM; | |
1587 | ||
1588 | dash = strchr(dash+1, '-'); | |
1589 | } | |
1590 | ||
1591 | e = cg_escape(unit); | |
1592 | if (!e) | |
1593 | return -ENOMEM; | |
1594 | ||
1595 | if (!strextend(&s, e, NULL)) | |
1596 | return -ENOMEM; | |
1597 | ||
1598 | *ret = s; | |
1599 | s = NULL; | |
1600 | ||
1601 | return 0; | |
1602 | } | |
4ad49000 LP |
1603 | |
1604 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
1605 | _cleanup_free_ char *p = NULL; | |
1606 | int r; | |
1607 | ||
1608 | r = cg_get_path(controller, path, attribute, &p); | |
1609 | if (r < 0) | |
1610 | return r; | |
1611 | ||
1612 | return write_string_file(p, value); | |
1613 | } | |
1614 | ||
1615 | static const char mask_names[] = | |
1616 | "cpu\0" | |
1617 | "cpuacct\0" | |
1618 | "blkio\0" | |
1619 | "memory\0" | |
1620 | "devices\0"; | |
1621 | ||
1622 | int cg_create_with_mask(CGroupControllerMask mask, const char *path) { | |
1623 | CGroupControllerMask bit = 1; | |
1624 | const char *n; | |
1625 | int r; | |
1626 | ||
1627 | /* This one will create a cgroup in our private tree, but also | |
1628 | * duplicate it in the trees specified in mask, and remove it | |
1629 | * in all others */ | |
1630 | ||
1631 | /* First create the cgroup in our own hierarchy. */ | |
1632 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
1633 | if (r < 0) | |
1634 | return r; | |
1635 | ||
1636 | /* Then, do the same in the other hierarchies */ | |
1637 | NULSTR_FOREACH(n, mask_names) { | |
1638 | if (bit & mask) | |
1639 | cg_create(n, path); | |
1640 | else | |
1641 | cg_trim(n, path, true); | |
1642 | ||
1643 | bit <<= 1; | |
1644 | } | |
1645 | ||
1646 | return r; | |
1647 | } | |
1648 | ||
1649 | int cg_attach_with_mask(CGroupControllerMask mask, const char *path, pid_t pid) { | |
1650 | CGroupControllerMask bit = 1; | |
1651 | const char *n; | |
1652 | int r; | |
1653 | ||
1654 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
1655 | ||
1656 | NULSTR_FOREACH(n, mask_names) { | |
1657 | if (bit & mask) | |
1658 | cg_attach(n, path, pid); | |
1659 | else { | |
1660 | char prefix[strlen(path) + 1], *slash; | |
1661 | ||
1662 | /* OK, this one is a bit harder... Now we need | |
1663 | * to add to the closest parent cgroup we | |
1664 | * can find */ | |
1665 | strcpy(prefix, path); | |
1666 | while ((slash = strrchr(prefix, '/'))) { | |
1667 | int q; | |
1668 | *slash = 0; | |
1669 | ||
1670 | q = cg_attach(n, prefix, pid); | |
1671 | if (q >= 0) | |
1672 | break; | |
1673 | } | |
1674 | } | |
1675 | ||
1676 | bit <<= 1; | |
1677 | } | |
1678 | ||
1679 | return r; | |
1680 | } | |
1681 | ||
1682 | int cg_migrate_with_mask(CGroupControllerMask mask, const char *from, const char *to) { | |
1683 | CGroupControllerMask bit = 1; | |
1684 | const char *n; | |
1685 | int r; | |
1686 | ||
1687 | if (path_equal(from, to)) | |
1688 | return 0; | |
1689 | ||
1690 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true); | |
1691 | ||
1692 | NULSTR_FOREACH(n, mask_names) { | |
1693 | if (bit & mask) | |
1694 | cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, to, n, to, false, false); | |
1695 | else { | |
1696 | char prefix[strlen(to) + 1], *slash; | |
1697 | ||
1698 | strcpy(prefix, to); | |
1699 | while ((slash = strrchr(prefix, '/'))) { | |
1700 | int q; | |
1701 | ||
1702 | *slash = 0; | |
1703 | ||
1704 | q = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, to, n, prefix, false, false); | |
1705 | if (q >= 0) | |
1706 | break; | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | bit <<= 1; | |
1711 | } | |
1712 | ||
1713 | return r; | |
1714 | } | |
1715 | ||
1716 | int cg_trim_with_mask(CGroupControllerMask mask, const char *path, bool delete_root) { | |
1717 | CGroupControllerMask bit = 1; | |
1718 | const char *n; | |
1719 | int r; | |
1720 | ||
1721 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
1722 | if (r < 0) | |
1723 | return r; | |
1724 | ||
1725 | NULSTR_FOREACH(n, mask_names) { | |
1726 | if (bit & mask) | |
1727 | cg_trim(n, path, delete_root); | |
1728 | ||
1729 | bit <<= 1; | |
1730 | } | |
1731 | ||
1732 | return r; | |
1733 | } | |
1734 | ||
1735 | CGroupControllerMask cg_mask_supported(void) { | |
1736 | CGroupControllerMask bit = 1, mask = 0; | |
1737 | const char *n; | |
1738 | ||
1739 | NULSTR_FOREACH(n, mask_names) { | |
1740 | if (check_hierarchy(n) >= 0) | |
1741 | mask |= bit; | |
1742 | ||
1743 | bit <<= 1; | |
1744 | } | |
1745 | ||
1746 | return mask; | |
1747 | } |