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663996b3 MS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
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 | |
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 | |
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 | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
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> | |
27 | #include <dirent.h> | |
28 | #include <sys/stat.h> | |
29 | #include <sys/types.h> | |
30 | #include <ftw.h> | |
31 | ||
32 | #include "cgroup-util.h" | |
663996b3 MS |
33 | #include "set.h" |
34 | #include "macro.h" | |
35 | #include "util.h" | |
e3bff60a MP |
36 | #include "formats-util.h" |
37 | #include "process-util.h" | |
663996b3 | 38 | #include "path-util.h" |
663996b3 MS |
39 | #include "unit-name.h" |
40 | #include "fileio.h" | |
14228c0d MB |
41 | #include "special.h" |
42 | #include "mkdir.h" | |
86f210e9 | 43 | #include "login-util.h" |
663996b3 MS |
44 | |
45 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { | |
46 | _cleanup_free_ char *fs = NULL; | |
47 | FILE *f; | |
48 | int r; | |
49 | ||
50 | assert(_f); | |
51 | ||
52 | r = cg_get_path(controller, path, "cgroup.procs", &fs); | |
53 | if (r < 0) | |
54 | return r; | |
55 | ||
56 | f = fopen(fs, "re"); | |
57 | if (!f) | |
58 | return -errno; | |
59 | ||
60 | *_f = f; | |
61 | return 0; | |
62 | } | |
63 | ||
663996b3 MS |
64 | int cg_read_pid(FILE *f, pid_t *_pid) { |
65 | unsigned long ul; | |
66 | ||
67 | /* Note that the cgroup.procs might contain duplicates! See | |
68 | * cgroups.txt for details. */ | |
69 | ||
70 | assert(f); | |
71 | assert(_pid); | |
72 | ||
73 | errno = 0; | |
74 | if (fscanf(f, "%lu", &ul) != 1) { | |
75 | ||
76 | if (feof(f)) | |
77 | return 0; | |
78 | ||
79 | return errno ? -errno : -EIO; | |
80 | } | |
81 | ||
82 | if (ul <= 0) | |
83 | return -EIO; | |
84 | ||
85 | *_pid = (pid_t) ul; | |
86 | return 1; | |
87 | } | |
88 | ||
89 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { | |
90 | _cleanup_free_ char *fs = NULL; | |
91 | int r; | |
92 | DIR *d; | |
93 | ||
94 | assert(_d); | |
95 | ||
96 | /* This is not recursive! */ | |
97 | ||
98 | r = cg_get_path(controller, path, NULL, &fs); | |
99 | if (r < 0) | |
100 | return r; | |
101 | ||
102 | d = opendir(fs); | |
103 | if (!d) | |
104 | return -errno; | |
105 | ||
106 | *_d = d; | |
107 | return 0; | |
108 | } | |
109 | ||
110 | int cg_read_subgroup(DIR *d, char **fn) { | |
111 | struct dirent *de; | |
112 | ||
113 | assert(d); | |
114 | assert(fn); | |
115 | ||
116 | FOREACH_DIRENT(de, d, return -errno) { | |
117 | char *b; | |
118 | ||
119 | if (de->d_type != DT_DIR) | |
120 | continue; | |
121 | ||
122 | if (streq(de->d_name, ".") || | |
123 | streq(de->d_name, "..")) | |
124 | continue; | |
125 | ||
126 | b = strdup(de->d_name); | |
127 | if (!b) | |
128 | return -ENOMEM; | |
129 | ||
130 | *fn = b; | |
131 | return 1; | |
132 | } | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
14228c0d | 137 | int cg_rmdir(const char *controller, const char *path) { |
663996b3 MS |
138 | _cleanup_free_ char *p = NULL; |
139 | int r; | |
140 | ||
141 | r = cg_get_path(controller, path, NULL, &p); | |
142 | if (r < 0) | |
143 | return r; | |
144 | ||
663996b3 MS |
145 | r = rmdir(p); |
146 | if (r < 0 && errno != ENOENT) | |
147 | return -errno; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) { | |
153 | _cleanup_set_free_ Set *allocated_set = NULL; | |
154 | bool done = false; | |
155 | int r, ret = 0; | |
156 | pid_t my_pid; | |
157 | ||
158 | assert(sig >= 0); | |
159 | ||
160 | /* This goes through the tasks list and kills them all. This | |
161 | * is repeated until no further processes are added to the | |
162 | * tasks list, to properly handle forking processes */ | |
163 | ||
164 | if (!s) { | |
5eef597e | 165 | s = allocated_set = set_new(NULL); |
663996b3 MS |
166 | if (!s) |
167 | return -ENOMEM; | |
168 | } | |
169 | ||
170 | my_pid = getpid(); | |
171 | ||
172 | do { | |
173 | _cleanup_fclose_ FILE *f = NULL; | |
174 | pid_t pid = 0; | |
175 | done = true; | |
176 | ||
177 | r = cg_enumerate_processes(controller, path, &f); | |
178 | if (r < 0) { | |
179 | if (ret >= 0 && r != -ENOENT) | |
180 | return r; | |
181 | ||
182 | return ret; | |
183 | } | |
184 | ||
185 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
186 | ||
187 | if (ignore_self && pid == my_pid) | |
188 | continue; | |
189 | ||
190 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) | |
191 | continue; | |
192 | ||
193 | /* If we haven't killed this process yet, kill | |
194 | * it */ | |
195 | if (kill(pid, sig) < 0) { | |
196 | if (ret >= 0 && errno != ESRCH) | |
197 | ret = -errno; | |
60f067b4 | 198 | } else { |
f47781d8 | 199 | if (sigcont && sig != SIGKILL) |
663996b3 MS |
200 | kill(pid, SIGCONT); |
201 | ||
60f067b4 JS |
202 | if (ret == 0) |
203 | ret = 1; | |
663996b3 MS |
204 | } |
205 | ||
206 | done = false; | |
207 | ||
208 | r = set_put(s, LONG_TO_PTR(pid)); | |
209 | if (r < 0) { | |
210 | if (ret >= 0) | |
211 | return r; | |
212 | ||
213 | return ret; | |
214 | } | |
215 | } | |
216 | ||
217 | if (r < 0) { | |
218 | if (ret >= 0) | |
219 | return r; | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
224 | /* To avoid racing against processes which fork | |
225 | * quicker than we can kill them we repeat this until | |
226 | * no new pids need to be killed. */ | |
227 | ||
228 | } while (!done); | |
229 | ||
230 | return ret; | |
231 | } | |
232 | ||
233 | int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) { | |
234 | _cleanup_set_free_ Set *allocated_set = NULL; | |
235 | _cleanup_closedir_ DIR *d = NULL; | |
236 | int r, ret = 0; | |
237 | char *fn; | |
238 | ||
239 | assert(path); | |
240 | assert(sig >= 0); | |
241 | ||
242 | if (!s) { | |
5eef597e | 243 | s = allocated_set = set_new(NULL); |
663996b3 MS |
244 | if (!s) |
245 | return -ENOMEM; | |
246 | } | |
247 | ||
248 | ret = cg_kill(controller, path, sig, sigcont, ignore_self, s); | |
249 | ||
250 | r = cg_enumerate_subgroups(controller, path, &d); | |
251 | if (r < 0) { | |
252 | if (ret >= 0 && r != -ENOENT) | |
253 | return r; | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
258 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
259 | _cleanup_free_ char *p = NULL; | |
260 | ||
261 | p = strjoin(path, "/", fn, NULL); | |
262 | free(fn); | |
263 | if (!p) | |
264 | return -ENOMEM; | |
265 | ||
266 | r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s); | |
267 | if (ret >= 0 && r != 0) | |
268 | ret = r; | |
269 | } | |
270 | ||
271 | if (ret >= 0 && r < 0) | |
272 | ret = r; | |
273 | ||
274 | if (rem) { | |
14228c0d | 275 | r = cg_rmdir(controller, path); |
663996b3 MS |
276 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
277 | return r; | |
278 | } | |
279 | ||
280 | return ret; | |
281 | } | |
282 | ||
663996b3 MS |
283 | int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) { |
284 | bool done = false; | |
285 | _cleanup_set_free_ Set *s = NULL; | |
286 | int r, ret = 0; | |
287 | pid_t my_pid; | |
288 | ||
289 | assert(cfrom); | |
290 | assert(pfrom); | |
291 | assert(cto); | |
292 | assert(pto); | |
293 | ||
5eef597e | 294 | s = set_new(NULL); |
663996b3 MS |
295 | if (!s) |
296 | return -ENOMEM; | |
297 | ||
298 | my_pid = getpid(); | |
299 | ||
300 | do { | |
301 | _cleanup_fclose_ FILE *f = NULL; | |
302 | pid_t pid = 0; | |
303 | done = true; | |
304 | ||
14228c0d | 305 | r = cg_enumerate_processes(cfrom, pfrom, &f); |
663996b3 MS |
306 | if (r < 0) { |
307 | if (ret >= 0 && r != -ENOENT) | |
308 | return r; | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
313 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
314 | ||
315 | /* This might do weird stuff if we aren't a | |
316 | * single-threaded program. However, we | |
317 | * luckily know we are not */ | |
318 | if (ignore_self && pid == my_pid) | |
319 | continue; | |
320 | ||
321 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) | |
322 | continue; | |
323 | ||
324 | r = cg_attach(cto, pto, pid); | |
325 | if (r < 0) { | |
326 | if (ret >= 0 && r != -ESRCH) | |
327 | ret = r; | |
328 | } else if (ret == 0) | |
329 | ret = 1; | |
330 | ||
331 | done = false; | |
332 | ||
333 | r = set_put(s, LONG_TO_PTR(pid)); | |
334 | if (r < 0) { | |
335 | if (ret >= 0) | |
336 | return r; | |
337 | ||
338 | return ret; | |
339 | } | |
340 | } | |
341 | ||
342 | if (r < 0) { | |
343 | if (ret >= 0) | |
344 | return r; | |
345 | ||
346 | return ret; | |
347 | } | |
348 | } while (!done); | |
349 | ||
350 | return ret; | |
351 | } | |
352 | ||
14228c0d MB |
353 | int cg_migrate_recursive( |
354 | const char *cfrom, | |
355 | const char *pfrom, | |
356 | const char *cto, | |
357 | const char *pto, | |
358 | bool ignore_self, | |
359 | bool rem) { | |
360 | ||
663996b3 MS |
361 | _cleanup_closedir_ DIR *d = NULL; |
362 | int r, ret = 0; | |
363 | char *fn; | |
364 | ||
365 | assert(cfrom); | |
366 | assert(pfrom); | |
367 | assert(cto); | |
368 | assert(pto); | |
369 | ||
370 | ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self); | |
371 | ||
372 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); | |
373 | if (r < 0) { | |
374 | if (ret >= 0 && r != -ENOENT) | |
375 | return r; | |
376 | ||
377 | return ret; | |
378 | } | |
379 | ||
380 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
381 | _cleanup_free_ char *p = NULL; | |
382 | ||
383 | p = strjoin(pfrom, "/", fn, NULL); | |
384 | free(fn); | |
385 | if (!p) { | |
386 | if (ret >= 0) | |
387 | return -ENOMEM; | |
388 | ||
389 | return ret; | |
390 | } | |
391 | ||
392 | r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem); | |
393 | if (r != 0 && ret >= 0) | |
394 | ret = r; | |
395 | } | |
396 | ||
397 | if (r < 0 && ret >= 0) | |
398 | ret = r; | |
399 | ||
400 | if (rem) { | |
14228c0d | 401 | r = cg_rmdir(cfrom, pfrom); |
663996b3 MS |
402 | if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY) |
403 | return r; | |
404 | } | |
405 | ||
406 | return ret; | |
407 | } | |
408 | ||
14228c0d MB |
409 | int cg_migrate_recursive_fallback( |
410 | const char *cfrom, | |
411 | const char *pfrom, | |
412 | const char *cto, | |
413 | const char *pto, | |
414 | bool ignore_self, | |
415 | bool rem) { | |
416 | ||
417 | int r; | |
418 | ||
419 | assert(cfrom); | |
420 | assert(pfrom); | |
421 | assert(cto); | |
422 | assert(pto); | |
423 | ||
424 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem); | |
425 | if (r < 0) { | |
426 | char prefix[strlen(pto) + 1]; | |
427 | ||
428 | /* This didn't work? Then let's try all prefixes of the destination */ | |
429 | ||
430 | PATH_FOREACH_PREFIX(prefix, pto) { | |
431 | r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem); | |
432 | if (r >= 0) | |
433 | break; | |
434 | } | |
435 | } | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
663996b3 MS |
440 | static const char *normalize_controller(const char *controller) { |
441 | ||
442 | assert(controller); | |
443 | ||
86f210e9 | 444 | if (startswith(controller, "name=")) |
663996b3 MS |
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) { | |
451 | char *t = NULL; | |
452 | ||
14228c0d MB |
453 | if (!isempty(controller)) { |
454 | if (!isempty(path) && !isempty(suffix)) | |
663996b3 | 455 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL); |
14228c0d | 456 | else if (!isempty(path)) |
663996b3 | 457 | t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL); |
14228c0d | 458 | else if (!isempty(suffix)) |
663996b3 MS |
459 | t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL); |
460 | else | |
461 | t = strappend("/sys/fs/cgroup/", controller); | |
462 | } else { | |
14228c0d | 463 | if (!isempty(path) && !isempty(suffix)) |
663996b3 | 464 | t = strjoin(path, "/", suffix, NULL); |
14228c0d | 465 | else if (!isempty(path)) |
663996b3 MS |
466 | t = strdup(path); |
467 | else | |
468 | return -EINVAL; | |
469 | } | |
470 | ||
471 | if (!t) | |
472 | return -ENOMEM; | |
473 | ||
60f067b4 | 474 | *fs = path_kill_slashes(t); |
663996b3 MS |
475 | return 0; |
476 | } | |
477 | ||
478 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
479 | const char *p; | |
60f067b4 | 480 | static thread_local bool good = false; |
663996b3 MS |
481 | |
482 | assert(fs); | |
483 | ||
86f210e9 | 484 | if (controller && !cg_controller_is_valid(controller)) |
663996b3 MS |
485 | return -EINVAL; |
486 | ||
487 | if (_unlikely_(!good)) { | |
488 | int r; | |
489 | ||
86f210e9 | 490 | r = path_is_mount_point("/sys/fs/cgroup", 0); |
e3bff60a MP |
491 | if (r < 0) |
492 | return r; | |
493 | if (r == 0) | |
494 | return -ENOENT; | |
663996b3 MS |
495 | |
496 | /* Cache this to save a few stat()s */ | |
497 | good = true; | |
498 | } | |
499 | ||
500 | p = controller ? normalize_controller(controller) : NULL; | |
501 | ||
502 | return join_path(p, path, suffix, fs); | |
503 | } | |
504 | ||
505 | static int check_hierarchy(const char *p) { | |
e735f4d4 | 506 | const char *cc; |
663996b3 MS |
507 | |
508 | assert(p); | |
509 | ||
e735f4d4 MP |
510 | if (!filename_is_valid(p)) |
511 | return 0; | |
512 | ||
663996b3 | 513 | /* Check if this controller actually really exists */ |
e735f4d4 MP |
514 | cc = strjoina("/sys/fs/cgroup/", p); |
515 | if (laccess(cc, F_OK) < 0) | |
663996b3 MS |
516 | return -errno; |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { | |
522 | const char *p; | |
523 | int r; | |
524 | ||
525 | assert(fs); | |
526 | ||
86f210e9 | 527 | if (!cg_controller_is_valid(controller)) |
663996b3 MS |
528 | return -EINVAL; |
529 | ||
530 | /* Normalize the controller syntax */ | |
531 | p = normalize_controller(controller); | |
532 | ||
533 | /* Check if this controller actually really exists */ | |
534 | r = check_hierarchy(p); | |
535 | if (r < 0) | |
536 | return r; | |
537 | ||
538 | return join_path(p, path, suffix, fs); | |
539 | } | |
540 | ||
541 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { | |
14228c0d MB |
542 | assert(path); |
543 | assert(sb); | |
544 | assert(ftwbuf); | |
663996b3 MS |
545 | |
546 | if (typeflag != FTW_DP) | |
547 | return 0; | |
548 | ||
549 | if (ftwbuf->level < 1) | |
550 | return 0; | |
551 | ||
663996b3 MS |
552 | rmdir(path); |
553 | return 0; | |
554 | } | |
555 | ||
556 | int cg_trim(const char *controller, const char *path, bool delete_root) { | |
557 | _cleanup_free_ char *fs = NULL; | |
558 | int r = 0; | |
559 | ||
560 | assert(path); | |
561 | ||
562 | r = cg_get_path(controller, path, NULL, &fs); | |
563 | if (r < 0) | |
564 | return r; | |
565 | ||
566 | errno = 0; | |
567 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) | |
568 | r = errno ? -errno : -EIO; | |
569 | ||
570 | if (delete_root) { | |
14228c0d MB |
571 | if (rmdir(fs) < 0 && errno != ENOENT) |
572 | return -errno; | |
663996b3 MS |
573 | } |
574 | ||
575 | return r; | |
576 | } | |
577 | ||
578 | int cg_delete(const char *controller, const char *path) { | |
579 | _cleanup_free_ char *parent = NULL; | |
580 | int r; | |
581 | ||
582 | assert(path); | |
583 | ||
584 | r = path_get_parent(path, &parent); | |
585 | if (r < 0) | |
586 | return r; | |
587 | ||
588 | r = cg_migrate_recursive(controller, path, controller, parent, false, true); | |
589 | return r == -ENOENT ? 0 : r; | |
590 | } | |
591 | ||
14228c0d MB |
592 | int cg_create(const char *controller, const char *path) { |
593 | _cleanup_free_ char *fs = NULL; | |
594 | int r; | |
595 | ||
596 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
597 | if (r < 0) | |
598 | return r; | |
599 | ||
600 | r = mkdir_parents(fs, 0755); | |
601 | if (r < 0) | |
602 | return r; | |
603 | ||
604 | if (mkdir(fs, 0755) < 0) { | |
605 | ||
606 | if (errno == EEXIST) | |
607 | return 0; | |
608 | ||
609 | return -errno; | |
610 | } | |
611 | ||
612 | return 1; | |
613 | } | |
614 | ||
615 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
616 | int r, q; | |
617 | ||
618 | assert(pid >= 0); | |
619 | ||
620 | r = cg_create(controller, path); | |
621 | if (r < 0) | |
622 | return r; | |
623 | ||
624 | q = cg_attach(controller, path, pid); | |
625 | if (q < 0) | |
626 | return q; | |
627 | ||
628 | /* This does not remove the cgroup on failure */ | |
629 | return r; | |
630 | } | |
631 | ||
663996b3 MS |
632 | int cg_attach(const char *controller, const char *path, pid_t pid) { |
633 | _cleanup_free_ char *fs = NULL; | |
634 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
635 | int r; | |
636 | ||
637 | assert(path); | |
638 | assert(pid >= 0); | |
639 | ||
14228c0d | 640 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); |
663996b3 MS |
641 | if (r < 0) |
642 | return r; | |
643 | ||
644 | if (pid == 0) | |
645 | pid = getpid(); | |
646 | ||
60f067b4 | 647 | snprintf(c, sizeof(c), PID_FMT"\n", pid); |
663996b3 | 648 | |
7035cd9e | 649 | return write_string_file(fs, c, 0); |
663996b3 MS |
650 | } |
651 | ||
14228c0d MB |
652 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { |
653 | int r; | |
654 | ||
655 | assert(controller); | |
656 | assert(path); | |
657 | assert(pid >= 0); | |
658 | ||
659 | r = cg_attach(controller, path, pid); | |
660 | if (r < 0) { | |
661 | char prefix[strlen(path) + 1]; | |
662 | ||
663 | /* This didn't work? Then let's try all prefixes of | |
664 | * the destination */ | |
665 | ||
666 | PATH_FOREACH_PREFIX(prefix, path) { | |
667 | r = cg_attach(controller, prefix, pid); | |
668 | if (r >= 0) | |
669 | break; | |
670 | } | |
671 | } | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
663996b3 MS |
676 | int cg_set_group_access( |
677 | const char *controller, | |
678 | const char *path, | |
679 | mode_t mode, | |
680 | uid_t uid, | |
681 | gid_t gid) { | |
682 | ||
683 | _cleanup_free_ char *fs = NULL; | |
684 | int r; | |
685 | ||
686 | assert(path); | |
687 | ||
f47781d8 | 688 | if (mode != MODE_INVALID) |
663996b3 MS |
689 | mode &= 0777; |
690 | ||
691 | r = cg_get_path(controller, path, NULL, &fs); | |
692 | if (r < 0) | |
693 | return r; | |
694 | ||
695 | return chmod_and_chown(fs, mode, uid, gid); | |
696 | } | |
697 | ||
698 | int cg_set_task_access( | |
699 | const char *controller, | |
700 | const char *path, | |
701 | mode_t mode, | |
702 | uid_t uid, | |
14228c0d | 703 | gid_t gid) { |
663996b3 MS |
704 | |
705 | _cleanup_free_ char *fs = NULL, *procs = NULL; | |
706 | int r; | |
707 | ||
708 | assert(path); | |
709 | ||
f47781d8 | 710 | if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID) |
663996b3 MS |
711 | return 0; |
712 | ||
f47781d8 | 713 | if (mode != MODE_INVALID) |
663996b3 MS |
714 | mode &= 0666; |
715 | ||
14228c0d | 716 | r = cg_get_path(controller, path, "cgroup.procs", &fs); |
663996b3 MS |
717 | if (r < 0) |
718 | return r; | |
719 | ||
663996b3 MS |
720 | r = chmod_and_chown(fs, mode, uid, gid); |
721 | if (r < 0) | |
722 | return r; | |
723 | ||
14228c0d MB |
724 | /* Compatibility, Always keep values for "tasks" in sync with |
725 | * "cgroup.procs" */ | |
726 | r = cg_get_path(controller, path, "tasks", &procs); | |
663996b3 MS |
727 | if (r < 0) |
728 | return r; | |
729 | ||
730 | return chmod_and_chown(procs, mode, uid, gid); | |
731 | } | |
732 | ||
733 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { | |
734 | _cleanup_fclose_ FILE *f = NULL; | |
735 | char line[LINE_MAX]; | |
736 | const char *fs; | |
737 | size_t cs; | |
738 | ||
739 | assert(path); | |
740 | assert(pid >= 0); | |
741 | ||
742 | if (controller) { | |
86f210e9 | 743 | if (!cg_controller_is_valid(controller)) |
663996b3 MS |
744 | return -EINVAL; |
745 | ||
746 | controller = normalize_controller(controller); | |
747 | } else | |
748 | controller = SYSTEMD_CGROUP_CONTROLLER; | |
749 | ||
60f067b4 | 750 | fs = procfs_file_alloca(pid, "cgroup"); |
663996b3 MS |
751 | |
752 | f = fopen(fs, "re"); | |
753 | if (!f) | |
754 | return errno == ENOENT ? -ESRCH : -errno; | |
755 | ||
756 | cs = strlen(controller); | |
757 | ||
758 | FOREACH_LINE(line, f, return -errno) { | |
5eef597e | 759 | char *l, *p, *e; |
663996b3 | 760 | size_t k; |
5eef597e | 761 | const char *word, *state; |
663996b3 MS |
762 | bool found = false; |
763 | ||
764 | truncate_nl(line); | |
765 | ||
766 | l = strchr(line, ':'); | |
767 | if (!l) | |
768 | continue; | |
769 | ||
770 | l++; | |
771 | e = strchr(l, ':'); | |
772 | if (!e) | |
773 | continue; | |
774 | ||
775 | *e = 0; | |
776 | ||
5eef597e | 777 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) { |
663996b3 | 778 | |
5eef597e | 779 | if (k == cs && memcmp(word, controller, cs) == 0) { |
663996b3 MS |
780 | found = true; |
781 | break; | |
782 | } | |
783 | ||
784 | if (k == 5 + cs && | |
5eef597e MP |
785 | memcmp(word, "name=", 5) == 0 && |
786 | memcmp(word+5, controller, cs) == 0) { | |
663996b3 MS |
787 | found = true; |
788 | break; | |
789 | } | |
790 | } | |
791 | ||
792 | if (!found) | |
793 | continue; | |
794 | ||
795 | p = strdup(e + 1); | |
796 | if (!p) | |
797 | return -ENOMEM; | |
798 | ||
799 | *path = p; | |
800 | return 0; | |
801 | } | |
802 | ||
803 | return -ENOENT; | |
804 | } | |
805 | ||
806 | int cg_install_release_agent(const char *controller, const char *agent) { | |
807 | _cleanup_free_ char *fs = NULL, *contents = NULL; | |
808 | char *sc; | |
809 | int r; | |
810 | ||
811 | assert(agent); | |
812 | ||
813 | r = cg_get_path(controller, NULL, "release_agent", &fs); | |
814 | if (r < 0) | |
815 | return r; | |
816 | ||
817 | r = read_one_line_file(fs, &contents); | |
818 | if (r < 0) | |
819 | return r; | |
820 | ||
821 | sc = strstrip(contents); | |
822 | if (sc[0] == 0) { | |
7035cd9e | 823 | r = write_string_file(fs, agent, 0); |
663996b3 MS |
824 | if (r < 0) |
825 | return r; | |
826 | } else if (!streq(sc, agent)) | |
827 | return -EEXIST; | |
828 | ||
829 | free(fs); | |
830 | fs = NULL; | |
831 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); | |
832 | if (r < 0) | |
833 | return r; | |
834 | ||
835 | free(contents); | |
836 | contents = NULL; | |
837 | r = read_one_line_file(fs, &contents); | |
838 | if (r < 0) | |
839 | return r; | |
840 | ||
841 | sc = strstrip(contents); | |
842 | if (streq(sc, "0")) { | |
7035cd9e | 843 | r = write_string_file(fs, "1", 0); |
663996b3 MS |
844 | if (r < 0) |
845 | return r; | |
846 | ||
847 | return 1; | |
848 | } | |
849 | ||
850 | if (!streq(sc, "1")) | |
851 | return -EIO; | |
852 | ||
853 | return 0; | |
854 | } | |
855 | ||
14228c0d MB |
856 | int cg_uninstall_release_agent(const char *controller) { |
857 | _cleanup_free_ char *fs = NULL; | |
858 | int r; | |
859 | ||
860 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); | |
861 | if (r < 0) | |
862 | return r; | |
863 | ||
7035cd9e | 864 | r = write_string_file(fs, "0", 0); |
14228c0d MB |
865 | if (r < 0) |
866 | return r; | |
867 | ||
868 | free(fs); | |
869 | fs = NULL; | |
870 | ||
871 | r = cg_get_path(controller, NULL, "release_agent", &fs); | |
872 | if (r < 0) | |
873 | return r; | |
874 | ||
7035cd9e | 875 | r = write_string_file(fs, "", 0); |
14228c0d MB |
876 | if (r < 0) |
877 | return r; | |
878 | ||
879 | return 0; | |
880 | } | |
881 | ||
663996b3 MS |
882 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { |
883 | _cleanup_fclose_ FILE *f = NULL; | |
884 | pid_t pid = 0, self_pid; | |
885 | bool found = false; | |
886 | int r; | |
887 | ||
888 | assert(path); | |
889 | ||
14228c0d | 890 | r = cg_enumerate_processes(controller, path, &f); |
663996b3 MS |
891 | if (r < 0) |
892 | return r == -ENOENT ? 1 : r; | |
893 | ||
894 | self_pid = getpid(); | |
895 | ||
896 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
897 | ||
898 | if (ignore_self && pid == self_pid) | |
899 | continue; | |
900 | ||
901 | found = true; | |
902 | break; | |
903 | } | |
904 | ||
905 | if (r < 0) | |
906 | return r; | |
907 | ||
908 | return !found; | |
909 | } | |
910 | ||
663996b3 MS |
911 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { |
912 | _cleanup_closedir_ DIR *d = NULL; | |
913 | char *fn; | |
914 | int r; | |
915 | ||
916 | assert(path); | |
917 | ||
918 | r = cg_is_empty(controller, path, ignore_self); | |
919 | if (r <= 0) | |
920 | return r; | |
921 | ||
922 | r = cg_enumerate_subgroups(controller, path, &d); | |
923 | if (r < 0) | |
924 | return r == -ENOENT ? 1 : r; | |
925 | ||
926 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
927 | _cleanup_free_ char *p = NULL; | |
928 | ||
929 | p = strjoin(path, "/", fn, NULL); | |
930 | free(fn); | |
931 | if (!p) | |
932 | return -ENOMEM; | |
933 | ||
934 | r = cg_is_empty_recursive(controller, p, ignore_self); | |
935 | if (r <= 0) | |
936 | return r; | |
937 | } | |
938 | ||
939 | if (r < 0) | |
940 | return r; | |
941 | ||
942 | return 1; | |
943 | } | |
944 | ||
945 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
946 | const char *e; | |
947 | char *t = NULL, *u = NULL; | |
948 | _cleanup_free_ char *v = NULL; | |
949 | ||
950 | assert(spec); | |
951 | ||
952 | if (*spec == '/') { | |
953 | if (!path_is_safe(spec)) | |
954 | return -EINVAL; | |
955 | ||
956 | if (path) { | |
957 | t = strdup(spec); | |
958 | if (!t) | |
959 | return -ENOMEM; | |
960 | ||
60f067b4 | 961 | *path = path_kill_slashes(t); |
663996b3 MS |
962 | } |
963 | ||
964 | if (controller) | |
965 | *controller = NULL; | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
970 | e = strchr(spec, ':'); | |
971 | if (!e) { | |
86f210e9 | 972 | if (!cg_controller_is_valid(spec)) |
663996b3 MS |
973 | return -EINVAL; |
974 | ||
975 | if (controller) { | |
976 | t = strdup(normalize_controller(spec)); | |
977 | if (!t) | |
978 | return -ENOMEM; | |
979 | ||
980 | *controller = t; | |
981 | } | |
982 | ||
983 | if (path) | |
984 | *path = NULL; | |
985 | ||
986 | return 0; | |
987 | } | |
988 | ||
989 | v = strndup(spec, e-spec); | |
990 | if (!v) | |
991 | return -ENOMEM; | |
992 | t = strdup(normalize_controller(v)); | |
993 | if (!t) | |
994 | return -ENOMEM; | |
86f210e9 | 995 | if (!cg_controller_is_valid(t)) { |
663996b3 MS |
996 | free(t); |
997 | return -EINVAL; | |
998 | } | |
999 | ||
14228c0d MB |
1000 | if (streq(e+1, "")) { |
1001 | u = strdup("/"); | |
1002 | if (!u) { | |
1003 | free(t); | |
1004 | return -ENOMEM; | |
1005 | } | |
1006 | } else { | |
1007 | u = strdup(e+1); | |
1008 | if (!u) { | |
1009 | free(t); | |
1010 | return -ENOMEM; | |
1011 | } | |
1012 | ||
1013 | if (!path_is_safe(u) || | |
1014 | !path_is_absolute(u)) { | |
1015 | free(t); | |
1016 | free(u); | |
1017 | return -EINVAL; | |
1018 | } | |
663996b3 | 1019 | |
14228c0d MB |
1020 | path_kill_slashes(u); |
1021 | } | |
663996b3 MS |
1022 | |
1023 | if (controller) | |
1024 | *controller = t; | |
1025 | else | |
1026 | free(t); | |
1027 | ||
1028 | if (path) | |
1029 | *path = u; | |
1030 | else | |
1031 | free(u); | |
1032 | ||
1033 | return 0; | |
1034 | } | |
1035 | ||
663996b3 MS |
1036 | int cg_mangle_path(const char *path, char **result) { |
1037 | _cleanup_free_ char *c = NULL, *p = NULL; | |
1038 | char *t; | |
1039 | int r; | |
1040 | ||
1041 | assert(path); | |
1042 | assert(result); | |
1043 | ||
60f067b4 | 1044 | /* First, check if it already is a filesystem path */ |
663996b3 MS |
1045 | if (path_startswith(path, "/sys/fs/cgroup")) { |
1046 | ||
1047 | t = strdup(path); | |
1048 | if (!t) | |
1049 | return -ENOMEM; | |
1050 | ||
60f067b4 | 1051 | *result = path_kill_slashes(t); |
663996b3 MS |
1052 | return 0; |
1053 | } | |
1054 | ||
60f067b4 | 1055 | /* Otherwise, treat it as cg spec */ |
663996b3 MS |
1056 | r = cg_split_spec(path, &c, &p); |
1057 | if (r < 0) | |
1058 | return r; | |
1059 | ||
1060 | return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); | |
1061 | } | |
1062 | ||
663996b3 | 1063 | int cg_get_root_path(char **path) { |
14228c0d | 1064 | char *p, *e; |
663996b3 MS |
1065 | int r; |
1066 | ||
1067 | assert(path); | |
1068 | ||
14228c0d | 1069 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
663996b3 MS |
1070 | if (r < 0) |
1071 | return r; | |
1072 | ||
14228c0d MB |
1073 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); |
1074 | if (e) | |
663996b3 MS |
1075 | *e = 0; |
1076 | ||
663996b3 MS |
1077 | *path = p; |
1078 | return 0; | |
1079 | } | |
1080 | ||
60f067b4 JS |
1081 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { |
1082 | _cleanup_free_ char *rt = NULL; | |
1083 | char *p; | |
1084 | int r; | |
663996b3 | 1085 | |
60f067b4 JS |
1086 | assert(cgroup); |
1087 | assert(shifted); | |
663996b3 | 1088 | |
60f067b4 JS |
1089 | if (!root) { |
1090 | /* If the root was specified let's use that, otherwise | |
1091 | * let's determine it from PID 1 */ | |
663996b3 | 1092 | |
60f067b4 JS |
1093 | r = cg_get_root_path(&rt); |
1094 | if (r < 0) | |
1095 | return r; | |
663996b3 | 1096 | |
60f067b4 | 1097 | root = rt; |
663996b3 MS |
1098 | } |
1099 | ||
60f067b4 JS |
1100 | p = path_startswith(cgroup, root); |
1101 | if (p) | |
1102 | *shifted = p - 1; | |
1103 | else | |
1104 | *shifted = cgroup; | |
1105 | ||
1106 | return 0; | |
663996b3 MS |
1107 | } |
1108 | ||
60f067b4 JS |
1109 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { |
1110 | _cleanup_free_ char *raw = NULL; | |
1111 | const char *c; | |
663996b3 MS |
1112 | int r; |
1113 | ||
60f067b4 JS |
1114 | assert(pid >= 0); |
1115 | assert(cgroup); | |
1116 | ||
1117 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
663996b3 MS |
1118 | if (r < 0) |
1119 | return r; | |
1120 | ||
60f067b4 | 1121 | r = cg_shift_path(raw, root, &c); |
663996b3 MS |
1122 | if (r < 0) |
1123 | return r; | |
1124 | ||
60f067b4 JS |
1125 | if (c == raw) { |
1126 | *cgroup = raw; | |
1127 | raw = NULL; | |
1128 | } else { | |
1129 | char *n; | |
663996b3 | 1130 | |
60f067b4 JS |
1131 | n = strdup(c); |
1132 | if (!n) | |
663996b3 | 1133 | return -ENOMEM; |
663996b3 | 1134 | |
60f067b4 | 1135 | *cgroup = n; |
663996b3 MS |
1136 | } |
1137 | ||
663996b3 MS |
1138 | return 0; |
1139 | } | |
1140 | ||
1141 | int cg_path_decode_unit(const char *cgroup, char **unit){ | |
e3bff60a MP |
1142 | char *c, *s; |
1143 | size_t n; | |
663996b3 MS |
1144 | |
1145 | assert(cgroup); | |
1146 | assert(unit); | |
1147 | ||
e3bff60a MP |
1148 | n = strcspn(cgroup, "/"); |
1149 | if (n < 3) | |
1150 | return -ENXIO; | |
1151 | ||
1152 | c = strndupa(cgroup, n); | |
663996b3 MS |
1153 | c = cg_unescape(c); |
1154 | ||
e3bff60a MP |
1155 | if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) |
1156 | return -ENXIO; | |
663996b3 | 1157 | |
14228c0d MB |
1158 | s = strdup(c); |
1159 | if (!s) | |
1160 | return -ENOMEM; | |
663996b3 | 1161 | |
14228c0d MB |
1162 | *unit = s; |
1163 | return 0; | |
1164 | } | |
663996b3 | 1165 | |
e3bff60a MP |
1166 | static bool valid_slice_name(const char *p, size_t n) { |
1167 | ||
1168 | if (!p) | |
1169 | return false; | |
1170 | ||
1171 | if (n < strlen("x.slice")) | |
1172 | return false; | |
1173 | ||
1174 | if (memcmp(p + n - 6, ".slice", 6) == 0) { | |
1175 | char buf[n+1], *c; | |
1176 | ||
1177 | memcpy(buf, p, n); | |
1178 | buf[n] = 0; | |
1179 | ||
1180 | c = cg_unescape(buf); | |
1181 | ||
1182 | return unit_name_is_valid(c, UNIT_NAME_PLAIN); | |
1183 | } | |
1184 | ||
1185 | return false; | |
1186 | } | |
1187 | ||
14228c0d | 1188 | static const char *skip_slices(const char *p) { |
e3bff60a MP |
1189 | assert(p); |
1190 | ||
14228c0d | 1191 | /* Skips over all slice assignments */ |
663996b3 | 1192 | |
14228c0d MB |
1193 | for (;;) { |
1194 | size_t n; | |
663996b3 | 1195 | |
14228c0d | 1196 | p += strspn(p, "/"); |
663996b3 | 1197 | |
14228c0d | 1198 | n = strcspn(p, "/"); |
e3bff60a | 1199 | if (!valid_slice_name(p, n)) |
14228c0d | 1200 | return p; |
663996b3 | 1201 | |
14228c0d MB |
1202 | p += n; |
1203 | } | |
663996b3 MS |
1204 | } |
1205 | ||
e3bff60a | 1206 | int cg_path_get_unit(const char *path, char **ret) { |
663996b3 | 1207 | const char *e; |
e3bff60a MP |
1208 | char *unit; |
1209 | int r; | |
663996b3 MS |
1210 | |
1211 | assert(path); | |
e3bff60a | 1212 | assert(ret); |
663996b3 | 1213 | |
14228c0d | 1214 | e = skip_slices(path); |
663996b3 | 1215 | |
e3bff60a MP |
1216 | r = cg_path_decode_unit(e, &unit); |
1217 | if (r < 0) | |
1218 | return r; | |
1219 | ||
1220 | /* We skipped over the slices, don't accept any now */ | |
1221 | if (endswith(unit, ".slice")) { | |
1222 | free(unit); | |
1223 | return -ENXIO; | |
1224 | } | |
1225 | ||
1226 | *ret = unit; | |
1227 | return 0; | |
663996b3 MS |
1228 | } |
1229 | ||
1230 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
1231 | _cleanup_free_ char *cgroup = NULL; | |
1232 | int r; | |
1233 | ||
1234 | assert(unit); | |
1235 | ||
1236 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1237 | if (r < 0) | |
1238 | return r; | |
1239 | ||
1240 | return cg_path_get_unit(cgroup, unit); | |
1241 | } | |
1242 | ||
60f067b4 JS |
1243 | /** |
1244 | * Skip session-*.scope, but require it to be there. | |
1245 | */ | |
14228c0d MB |
1246 | static const char *skip_session(const char *p) { |
1247 | size_t n; | |
663996b3 | 1248 | |
e3bff60a MP |
1249 | if (isempty(p)) |
1250 | return NULL; | |
14228c0d MB |
1251 | |
1252 | p += strspn(p, "/"); | |
1253 | ||
1254 | n = strcspn(p, "/"); | |
e3bff60a | 1255 | if (n < strlen("session-x.scope")) |
60f067b4 JS |
1256 | return NULL; |
1257 | ||
e3bff60a MP |
1258 | if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { |
1259 | char buf[n - 8 - 6 + 1]; | |
1260 | ||
1261 | memcpy(buf, p + 8, n - 8 - 6); | |
1262 | buf[n - 8 - 6] = 0; | |
1263 | ||
1264 | /* Note that session scopes never need unescaping, | |
1265 | * since they cannot conflict with the kernel's own | |
1266 | * names, hence we don't need to call cg_unescape() | |
1267 | * here. */ | |
1268 | ||
1269 | if (!session_id_valid(buf)) | |
1270 | return false; | |
60f067b4 | 1271 | |
e3bff60a MP |
1272 | p += n; |
1273 | p += strspn(p, "/"); | |
1274 | return p; | |
1275 | } | |
1276 | ||
1277 | return NULL; | |
60f067b4 JS |
1278 | } |
1279 | ||
1280 | /** | |
1281 | * Skip user@*.service, but require it to be there. | |
1282 | */ | |
1283 | static const char *skip_user_manager(const char *p) { | |
1284 | size_t n; | |
1285 | ||
e3bff60a MP |
1286 | if (isempty(p)) |
1287 | return NULL; | |
60f067b4 JS |
1288 | |
1289 | p += strspn(p, "/"); | |
1290 | ||
1291 | n = strcspn(p, "/"); | |
e3bff60a | 1292 | if (n < strlen("user@x.service")) |
663996b3 MS |
1293 | return NULL; |
1294 | ||
e3bff60a MP |
1295 | if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { |
1296 | char buf[n - 5 - 8 + 1]; | |
14228c0d | 1297 | |
e3bff60a MP |
1298 | memcpy(buf, p + 5, n - 5 - 8); |
1299 | buf[n - 5 - 8] = 0; | |
1300 | ||
1301 | /* Note that user manager services never need unescaping, | |
1302 | * since they cannot conflict with the kernel's own | |
1303 | * names, hence we don't need to call cg_unescape() | |
1304 | * here. */ | |
1305 | ||
1306 | if (parse_uid(buf, NULL) < 0) | |
1307 | return NULL; | |
1308 | ||
1309 | p += n; | |
1310 | p += strspn(p, "/"); | |
1311 | ||
1312 | return p; | |
1313 | } | |
1314 | ||
1315 | return NULL; | |
663996b3 MS |
1316 | } |
1317 | ||
e3bff60a | 1318 | static const char *skip_user_prefix(const char *path) { |
60f067b4 | 1319 | const char *e, *t; |
663996b3 MS |
1320 | |
1321 | assert(path); | |
663996b3 | 1322 | |
14228c0d MB |
1323 | /* Skip slices, if there are any */ |
1324 | e = skip_slices(path); | |
663996b3 | 1325 | |
e3bff60a MP |
1326 | /* Skip the user manager, if it's in the path now... */ |
1327 | t = skip_user_manager(e); | |
1328 | if (t) | |
1329 | return t; | |
1330 | ||
1331 | /* Alternatively skip the user session if it is in the path... */ | |
1332 | return skip_session(e); | |
1333 | } | |
e735f4d4 | 1334 | |
e3bff60a MP |
1335 | int cg_path_get_user_unit(const char *path, char **ret) { |
1336 | const char *t; | |
663996b3 | 1337 | |
e3bff60a MP |
1338 | assert(path); |
1339 | assert(ret); | |
1340 | ||
1341 | t = skip_user_prefix(path); | |
1342 | if (!t) | |
1343 | return -ENXIO; | |
1344 | ||
1345 | /* And from here on it looks pretty much the same as for a | |
1346 | * system unit, hence let's use the same parser from here | |
1347 | * on. */ | |
1348 | return cg_path_get_unit(t, ret); | |
663996b3 MS |
1349 | } |
1350 | ||
1351 | int cg_pid_get_user_unit(pid_t pid, char **unit) { | |
1352 | _cleanup_free_ char *cgroup = NULL; | |
1353 | int r; | |
1354 | ||
1355 | assert(unit); | |
1356 | ||
1357 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1358 | if (r < 0) | |
1359 | return r; | |
1360 | ||
1361 | return cg_path_get_user_unit(cgroup, unit); | |
1362 | } | |
1363 | ||
1364 | int cg_path_get_machine_name(const char *path, char **machine) { | |
60f067b4 JS |
1365 | _cleanup_free_ char *u = NULL, *sl = NULL; |
1366 | int r; | |
14228c0d | 1367 | |
60f067b4 JS |
1368 | r = cg_path_get_unit(path, &u); |
1369 | if (r < 0) | |
1370 | return r; | |
663996b3 | 1371 | |
60f067b4 JS |
1372 | sl = strjoin("/run/systemd/machines/unit:", u, NULL); |
1373 | if (!sl) | |
663996b3 MS |
1374 | return -ENOMEM; |
1375 | ||
60f067b4 | 1376 | return readlink_malloc(sl, machine); |
663996b3 MS |
1377 | } |
1378 | ||
1379 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
1380 | _cleanup_free_ char *cgroup = NULL; | |
1381 | int r; | |
1382 | ||
1383 | assert(machine); | |
1384 | ||
1385 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1386 | if (r < 0) | |
1387 | return r; | |
1388 | ||
1389 | return cg_path_get_machine_name(cgroup, machine); | |
1390 | } | |
1391 | ||
1392 | int cg_path_get_session(const char *path, char **session) { | |
e3bff60a MP |
1393 | _cleanup_free_ char *unit = NULL; |
1394 | char *start, *end; | |
1395 | int r; | |
663996b3 MS |
1396 | |
1397 | assert(path); | |
663996b3 | 1398 | |
e3bff60a MP |
1399 | r = cg_path_get_unit(path, &unit); |
1400 | if (r < 0) | |
1401 | return r; | |
663996b3 | 1402 | |
e3bff60a MP |
1403 | start = startswith(unit, "session-"); |
1404 | if (!start) | |
1405 | return -ENXIO; | |
1406 | end = endswith(start, ".scope"); | |
1407 | if (!end) | |
1408 | return -ENXIO; | |
14228c0d | 1409 | |
e3bff60a MP |
1410 | *end = 0; |
1411 | if (!session_id_valid(start)) | |
1412 | return -ENXIO; | |
14228c0d | 1413 | |
60f067b4 | 1414 | if (session) { |
e3bff60a | 1415 | char *rr; |
60f067b4 | 1416 | |
e3bff60a MP |
1417 | rr = strdup(start); |
1418 | if (!rr) | |
60f067b4 JS |
1419 | return -ENOMEM; |
1420 | ||
e3bff60a | 1421 | *session = rr; |
60f067b4 | 1422 | } |
663996b3 | 1423 | |
663996b3 MS |
1424 | return 0; |
1425 | } | |
1426 | ||
1427 | int cg_pid_get_session(pid_t pid, char **session) { | |
1428 | _cleanup_free_ char *cgroup = NULL; | |
1429 | int r; | |
1430 | ||
663996b3 MS |
1431 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1432 | if (r < 0) | |
1433 | return r; | |
1434 | ||
1435 | return cg_path_get_session(cgroup, session); | |
1436 | } | |
1437 | ||
1438 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { | |
14228c0d | 1439 | _cleanup_free_ char *slice = NULL; |
e3bff60a | 1440 | char *start, *end; |
14228c0d | 1441 | int r; |
663996b3 MS |
1442 | |
1443 | assert(path); | |
663996b3 | 1444 | |
14228c0d MB |
1445 | r = cg_path_get_slice(path, &slice); |
1446 | if (r < 0) | |
1447 | return r; | |
663996b3 | 1448 | |
60f067b4 JS |
1449 | start = startswith(slice, "user-"); |
1450 | if (!start) | |
e3bff60a MP |
1451 | return -ENXIO; |
1452 | end = endswith(start, ".slice"); | |
60f067b4 | 1453 | if (!end) |
e3bff60a | 1454 | return -ENXIO; |
663996b3 | 1455 | |
e3bff60a MP |
1456 | *end = 0; |
1457 | if (parse_uid(start, uid) < 0) | |
1458 | return -ENXIO; | |
663996b3 | 1459 | |
60f067b4 | 1460 | return 0; |
663996b3 MS |
1461 | } |
1462 | ||
1463 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1464 | _cleanup_free_ char *cgroup = NULL; | |
1465 | int r; | |
1466 | ||
663996b3 MS |
1467 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1468 | if (r < 0) | |
1469 | return r; | |
1470 | ||
1471 | return cg_path_get_owner_uid(cgroup, uid); | |
1472 | } | |
1473 | ||
14228c0d MB |
1474 | int cg_path_get_slice(const char *p, char **slice) { |
1475 | const char *e = NULL; | |
14228c0d MB |
1476 | |
1477 | assert(p); | |
1478 | assert(slice); | |
1479 | ||
e3bff60a MP |
1480 | /* Finds the right-most slice unit from the beginning, but |
1481 | * stops before we come to the first non-slice unit. */ | |
1482 | ||
14228c0d MB |
1483 | for (;;) { |
1484 | size_t n; | |
1485 | ||
1486 | p += strspn(p, "/"); | |
1487 | ||
1488 | n = strcspn(p, "/"); | |
e3bff60a | 1489 | if (!valid_slice_name(p, n)) { |
14228c0d | 1490 | |
e3bff60a MP |
1491 | if (!e) { |
1492 | char *s; | |
14228c0d | 1493 | |
e3bff60a MP |
1494 | s = strdup("-.slice"); |
1495 | if (!s) | |
1496 | return -ENOMEM; | |
14228c0d | 1497 | |
e3bff60a MP |
1498 | *slice = s; |
1499 | return 0; | |
1500 | } | |
1501 | ||
1502 | return cg_path_decode_unit(e, slice); | |
14228c0d MB |
1503 | } |
1504 | ||
1505 | e = p; | |
14228c0d MB |
1506 | p += n; |
1507 | } | |
1508 | } | |
1509 | ||
1510 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1511 | _cleanup_free_ char *cgroup = NULL; | |
1512 | int r; | |
1513 | ||
1514 | assert(slice); | |
1515 | ||
1516 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1517 | if (r < 0) | |
1518 | return r; | |
1519 | ||
1520 | return cg_path_get_slice(cgroup, slice); | |
1521 | } | |
1522 | ||
e3bff60a MP |
1523 | int cg_path_get_user_slice(const char *p, char **slice) { |
1524 | const char *t; | |
1525 | assert(p); | |
1526 | assert(slice); | |
1527 | ||
1528 | t = skip_user_prefix(p); | |
1529 | if (!t) | |
1530 | return -ENXIO; | |
1531 | ||
1532 | /* And now it looks pretty much the same as for a system | |
1533 | * slice, so let's just use the same parser from here on. */ | |
1534 | return cg_path_get_slice(t, slice); | |
1535 | } | |
1536 | ||
1537 | int cg_pid_get_user_slice(pid_t pid, char **slice) { | |
1538 | _cleanup_free_ char *cgroup = NULL; | |
1539 | int r; | |
1540 | ||
1541 | assert(slice); | |
1542 | ||
1543 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1544 | if (r < 0) | |
1545 | return r; | |
1546 | ||
1547 | return cg_path_get_user_slice(cgroup, slice); | |
1548 | } | |
1549 | ||
663996b3 MS |
1550 | char *cg_escape(const char *p) { |
1551 | bool need_prefix = false; | |
1552 | ||
1553 | /* This implements very minimal escaping for names to be used | |
1554 | * as file names in the cgroup tree: any name which might | |
1555 | * conflict with a kernel name or is prefixed with '_' is | |
1556 | * prefixed with a '_'. That way, when reading cgroup names it | |
1557 | * is sufficient to remove a single prefixing underscore if | |
1558 | * there is one. */ | |
1559 | ||
1560 | /* The return value of this function (unlike cg_unescape()) | |
1561 | * needs free()! */ | |
1562 | ||
1563 | if (p[0] == 0 || | |
1564 | p[0] == '_' || | |
1565 | p[0] == '.' || | |
1566 | streq(p, "notify_on_release") || | |
1567 | streq(p, "release_agent") || | |
1568 | streq(p, "tasks")) | |
1569 | need_prefix = true; | |
1570 | else { | |
1571 | const char *dot; | |
1572 | ||
1573 | dot = strrchr(p, '.'); | |
1574 | if (dot) { | |
1575 | ||
1576 | if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0) | |
1577 | need_prefix = true; | |
1578 | else { | |
1579 | char *n; | |
1580 | ||
1581 | n = strndupa(p, dot - p); | |
1582 | ||
1583 | if (check_hierarchy(n) >= 0) | |
1584 | need_prefix = true; | |
1585 | } | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | if (need_prefix) | |
1590 | return strappend("_", p); | |
1591 | else | |
1592 | return strdup(p); | |
1593 | } | |
1594 | ||
1595 | char *cg_unescape(const char *p) { | |
1596 | assert(p); | |
1597 | ||
1598 | /* The return value of this function (unlike cg_escape()) | |
1599 | * doesn't need free()! */ | |
1600 | ||
1601 | if (p[0] == '_') | |
1602 | return (char*) p+1; | |
1603 | ||
1604 | return (char*) p; | |
1605 | } | |
1606 | ||
1607 | #define CONTROLLER_VALID \ | |
14228c0d | 1608 | DIGITS LETTERS \ |
663996b3 MS |
1609 | "_" |
1610 | ||
86f210e9 | 1611 | bool cg_controller_is_valid(const char *p) { |
663996b3 MS |
1612 | const char *t, *s; |
1613 | ||
1614 | if (!p) | |
1615 | return false; | |
1616 | ||
86f210e9 MP |
1617 | s = startswith(p, "name="); |
1618 | if (s) | |
1619 | p = s; | |
663996b3 MS |
1620 | |
1621 | if (*p == 0 || *p == '_') | |
1622 | return false; | |
1623 | ||
1624 | for (t = p; *t; t++) | |
1625 | if (!strchr(CONTROLLER_VALID, *t)) | |
1626 | return false; | |
1627 | ||
1628 | if (t - p > FILENAME_MAX) | |
1629 | return false; | |
1630 | ||
1631 | return true; | |
1632 | } | |
14228c0d MB |
1633 | |
1634 | int cg_slice_to_path(const char *unit, char **ret) { | |
1635 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1636 | const char *dash; | |
e3bff60a | 1637 | int r; |
14228c0d MB |
1638 | |
1639 | assert(unit); | |
1640 | assert(ret); | |
1641 | ||
e3bff60a MP |
1642 | if (streq(unit, "-.slice")) { |
1643 | char *x; | |
1644 | ||
1645 | x = strdup(""); | |
1646 | if (!x) | |
1647 | return -ENOMEM; | |
1648 | *ret = x; | |
1649 | return 0; | |
1650 | } | |
1651 | ||
1652 | if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) | |
14228c0d MB |
1653 | return -EINVAL; |
1654 | ||
1655 | if (!endswith(unit, ".slice")) | |
1656 | return -EINVAL; | |
1657 | ||
e3bff60a MP |
1658 | r = unit_name_to_prefix(unit, &p); |
1659 | if (r < 0) | |
1660 | return r; | |
14228c0d MB |
1661 | |
1662 | dash = strchr(p, '-'); | |
e3bff60a MP |
1663 | |
1664 | /* Don't allow initial dashes */ | |
1665 | if (dash == p) | |
1666 | return -EINVAL; | |
1667 | ||
14228c0d MB |
1668 | while (dash) { |
1669 | _cleanup_free_ char *escaped = NULL; | |
1670 | char n[dash - p + sizeof(".slice")]; | |
1671 | ||
e3bff60a MP |
1672 | /* Don't allow trailing or double dashes */ |
1673 | if (dash[1] == 0 || dash[1] == '-') | |
1674 | return -EINVAL; | |
14228c0d | 1675 | |
e3bff60a MP |
1676 | strcpy(stpncpy(n, p, dash - p), ".slice"); |
1677 | if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) | |
14228c0d MB |
1678 | return -EINVAL; |
1679 | ||
1680 | escaped = cg_escape(n); | |
1681 | if (!escaped) | |
1682 | return -ENOMEM; | |
1683 | ||
1684 | if (!strextend(&s, escaped, "/", NULL)) | |
1685 | return -ENOMEM; | |
1686 | ||
1687 | dash = strchr(dash+1, '-'); | |
1688 | } | |
1689 | ||
1690 | e = cg_escape(unit); | |
1691 | if (!e) | |
1692 | return -ENOMEM; | |
1693 | ||
1694 | if (!strextend(&s, e, NULL)) | |
1695 | return -ENOMEM; | |
1696 | ||
1697 | *ret = s; | |
1698 | s = NULL; | |
1699 | ||
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
1704 | _cleanup_free_ char *p = NULL; | |
1705 | int r; | |
1706 | ||
1707 | r = cg_get_path(controller, path, attribute, &p); | |
1708 | if (r < 0) | |
1709 | return r; | |
1710 | ||
7035cd9e | 1711 | return write_string_file(p, value, 0); |
14228c0d MB |
1712 | } |
1713 | ||
e735f4d4 MP |
1714 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
1715 | _cleanup_free_ char *p = NULL; | |
1716 | int r; | |
1717 | ||
1718 | r = cg_get_path(controller, path, attribute, &p); | |
1719 | if (r < 0) | |
1720 | return r; | |
1721 | ||
1722 | return read_one_line_file(p, ret); | |
1723 | } | |
1724 | ||
14228c0d MB |
1725 | static const char mask_names[] = |
1726 | "cpu\0" | |
1727 | "cpuacct\0" | |
1728 | "blkio\0" | |
1729 | "memory\0" | |
1730 | "devices\0"; | |
1731 | ||
1732 | int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) { | |
1733 | CGroupControllerMask bit = 1; | |
1734 | const char *n; | |
1735 | int r; | |
1736 | ||
1737 | /* This one will create a cgroup in our private tree, but also | |
1738 | * duplicate it in the trees specified in mask, and remove it | |
1739 | * in all others */ | |
1740 | ||
1741 | /* First create the cgroup in our own hierarchy. */ | |
1742 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
1743 | if (r < 0) | |
1744 | return r; | |
1745 | ||
1746 | /* Then, do the same in the other hierarchies */ | |
1747 | NULSTR_FOREACH(n, mask_names) { | |
1748 | if (mask & bit) | |
1749 | cg_create(n, path); | |
1750 | else if (supported & bit) | |
1751 | cg_trim(n, path, true); | |
1752 | ||
1753 | bit <<= 1; | |
1754 | } | |
1755 | ||
1756 | return 0; | |
1757 | } | |
1758 | ||
f47781d8 | 1759 | int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { |
14228c0d MB |
1760 | CGroupControllerMask bit = 1; |
1761 | const char *n; | |
1762 | int r; | |
1763 | ||
1764 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
1765 | if (r < 0) | |
1766 | return r; | |
1767 | ||
1768 | NULSTR_FOREACH(n, mask_names) { | |
f47781d8 MP |
1769 | |
1770 | if (supported & bit) { | |
1771 | const char *p = NULL; | |
1772 | ||
1773 | if (path_callback) | |
1774 | p = path_callback(bit, userdata); | |
1775 | ||
1776 | if (!p) | |
1777 | p = path; | |
1778 | ||
86f210e9 | 1779 | cg_attach_fallback(n, p, pid); |
f47781d8 | 1780 | } |
14228c0d MB |
1781 | |
1782 | bit <<= 1; | |
1783 | } | |
1784 | ||
1785 | return 0; | |
1786 | } | |
1787 | ||
f47781d8 | 1788 | int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { |
14228c0d MB |
1789 | Iterator i; |
1790 | void *pidp; | |
1791 | int r = 0; | |
1792 | ||
1793 | SET_FOREACH(pidp, pids, i) { | |
1794 | pid_t pid = PTR_TO_LONG(pidp); | |
1795 | int q; | |
1796 | ||
f47781d8 | 1797 | q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); |
14228c0d MB |
1798 | if (q < 0) |
1799 | r = q; | |
1800 | } | |
1801 | ||
1802 | return r; | |
1803 | } | |
1804 | ||
60f067b4 | 1805 | int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { |
14228c0d MB |
1806 | CGroupControllerMask bit = 1; |
1807 | const char *n; | |
1808 | int r; | |
1809 | ||
1810 | if (!path_equal(from, to)) { | |
1811 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true); | |
1812 | if (r < 0) | |
1813 | return r; | |
1814 | } | |
1815 | ||
1816 | NULSTR_FOREACH(n, mask_names) { | |
60f067b4 JS |
1817 | if (supported & bit) { |
1818 | const char *p = NULL; | |
1819 | ||
1820 | if (to_callback) | |
1821 | p = to_callback(bit, userdata); | |
1822 | ||
1823 | if (!p) | |
1824 | p = to; | |
1825 | ||
1826 | cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false); | |
1827 | } | |
14228c0d MB |
1828 | |
1829 | bit <<= 1; | |
1830 | } | |
1831 | ||
1832 | return 0; | |
1833 | } | |
1834 | ||
1835 | int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) { | |
1836 | CGroupControllerMask bit = 1; | |
1837 | const char *n; | |
1838 | int r; | |
1839 | ||
1840 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
1841 | if (r < 0) | |
1842 | return r; | |
1843 | ||
1844 | NULSTR_FOREACH(n, mask_names) { | |
1845 | if (supported & bit) | |
1846 | cg_trim(n, path, delete_root); | |
1847 | ||
1848 | bit <<= 1; | |
1849 | } | |
1850 | ||
1851 | return 0; | |
1852 | } | |
1853 | ||
1854 | CGroupControllerMask cg_mask_supported(void) { | |
1855 | CGroupControllerMask bit = 1, mask = 0; | |
1856 | const char *n; | |
1857 | ||
1858 | NULSTR_FOREACH(n, mask_names) { | |
1859 | if (check_hierarchy(n) >= 0) | |
1860 | mask |= bit; | |
1861 | ||
1862 | bit <<= 1; | |
1863 | } | |
1864 | ||
1865 | return mask; | |
1866 | } | |
e735f4d4 MP |
1867 | |
1868 | int cg_kernel_controllers(Set *controllers) { | |
1869 | _cleanup_fclose_ FILE *f = NULL; | |
1870 | char buf[LINE_MAX]; | |
1871 | int r; | |
1872 | ||
1873 | assert(controllers); | |
1874 | ||
1875 | f = fopen("/proc/cgroups", "re"); | |
1876 | if (!f) { | |
1877 | if (errno == ENOENT) | |
1878 | return 0; | |
1879 | return -errno; | |
1880 | } | |
1881 | ||
1882 | /* Ignore the header line */ | |
1883 | (void) fgets(buf, sizeof(buf), f); | |
1884 | ||
1885 | for (;;) { | |
1886 | char *controller; | |
1887 | int enabled = 0; | |
1888 | ||
1889 | errno = 0; | |
1890 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { | |
1891 | ||
1892 | if (feof(f)) | |
1893 | break; | |
1894 | ||
1895 | if (ferror(f) && errno) | |
1896 | return -errno; | |
1897 | ||
1898 | return -EBADMSG; | |
1899 | } | |
1900 | ||
1901 | if (!enabled) { | |
1902 | free(controller); | |
1903 | continue; | |
1904 | } | |
1905 | ||
1906 | if (!filename_is_valid(controller)) { | |
1907 | free(controller); | |
1908 | return -EBADMSG; | |
1909 | } | |
1910 | ||
1911 | r = set_consume(controllers, controller); | |
1912 | if (r < 0) | |
1913 | return r; | |
1914 | } | |
1915 | ||
1916 | return 0; | |
1917 | } |