]>
Commit | Line | Data |
---|---|---|
8c6db833 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
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 General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU 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> | |
35d2e7ec | 27 | #include <dirent.h> |
672c48cc LP |
28 | #include <sys/stat.h> |
29 | #include <sys/types.h> | |
8c6db833 LP |
30 | |
31 | #include "cgroup-util.h" | |
32 | #include "log.h" | |
33 | #include "set.h" | |
34 | #include "macro.h" | |
35 | #include "util.h" | |
36 | ||
c6c18be3 LP |
37 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { |
38 | char *fs; | |
39 | int r; | |
40 | FILE *f; | |
41 | ||
42 | assert(controller); | |
43 | assert(path); | |
44 | assert(_f); | |
45 | ||
46 | if ((r = cg_get_path(controller, path, "cgroup.procs", &fs)) < 0) | |
47 | return r; | |
48 | ||
49 | f = fopen(fs, "re"); | |
50 | free(fs); | |
51 | ||
52 | if (!f) | |
53 | return -errno; | |
54 | ||
55 | *_f = f; | |
56 | return 0; | |
57 | } | |
58 | ||
59 | int cg_enumerate_tasks(const char *controller, const char *path, FILE **_f) { | |
60 | char *fs; | |
61 | int r; | |
62 | FILE *f; | |
63 | ||
64 | assert(controller); | |
65 | assert(path); | |
66 | assert(_f); | |
67 | ||
68 | if ((r = cg_get_path(controller, path, "tasks", &fs)) < 0) | |
69 | return r; | |
70 | ||
71 | f = fopen(fs, "re"); | |
72 | free(fs); | |
73 | ||
74 | if (!f) | |
75 | return -errno; | |
76 | ||
77 | *_f = f; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | int cg_read_pid(FILE *f, pid_t *_pid) { | |
82 | unsigned long ul; | |
83 | ||
84 | /* Note that the cgroup.procs might contain duplicates! See | |
85 | * cgroups.txt for details. */ | |
86 | ||
87 | errno = 0; | |
88 | if (fscanf(f, "%lu", &ul) != 1) { | |
89 | ||
90 | if (feof(f)) | |
91 | return 0; | |
92 | ||
93 | return errno ? -errno : -EIO; | |
94 | } | |
95 | ||
96 | if (ul <= 0) | |
97 | return -EIO; | |
98 | ||
99 | *_pid = (pid_t) ul; | |
100 | return 1; | |
101 | } | |
102 | ||
35d2e7ec LP |
103 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { |
104 | char *fs; | |
105 | int r; | |
106 | DIR *d; | |
107 | ||
108 | assert(controller); | |
109 | assert(path); | |
110 | assert(_d); | |
111 | ||
112 | /* This is not recursive! */ | |
113 | ||
114 | if ((r = cg_get_path(controller, path, NULL, &fs)) < 0) | |
115 | return r; | |
116 | ||
117 | d = opendir(fs); | |
118 | free(fs); | |
119 | ||
120 | if (!d) | |
121 | return -errno; | |
122 | ||
123 | *_d = d; | |
124 | return 0; | |
125 | } | |
126 | ||
127 | int cg_read_subgroup(DIR *d, char **fn) { | |
128 | struct dirent *de; | |
129 | ||
130 | assert(d); | |
131 | ||
132 | errno = 0; | |
133 | while ((de = readdir(d))) { | |
134 | char *b; | |
135 | ||
136 | if (de->d_type != DT_DIR) | |
137 | continue; | |
138 | ||
139 | if (streq(de->d_name, ".") || | |
140 | streq(de->d_name, "..")) | |
141 | continue; | |
142 | ||
143 | if (!(b = strdup(de->d_name))) | |
144 | return -ENOMEM; | |
145 | ||
146 | *fn = b; | |
147 | return 1; | |
148 | } | |
149 | ||
150 | if (errno) | |
151 | return -errno; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | int cg_rmdir(const char *controller, const char *path) { | |
157 | char *p; | |
158 | int r; | |
159 | ||
160 | if ((r = cg_get_path(controller, path, NULL, &p)) < 0) | |
161 | return r; | |
162 | ||
163 | r = rmdir(p); | |
164 | free(p); | |
165 | ||
166 | return r < 0 ? -errno : 0; | |
167 | } | |
168 | ||
8c6db833 | 169 | int cg_kill(const char *controller, const char *path, int sig, bool ignore_self) { |
35d2e7ec | 170 | bool done = false; |
8c6db833 | 171 | Set *s; |
8c6db833 | 172 | int r, ret = 0; |
35d2e7ec | 173 | pid_t my_pid; |
c6c18be3 | 174 | FILE *f = NULL; |
8c6db833 LP |
175 | |
176 | assert(controller); | |
177 | assert(path); | |
178 | assert(sig >= 0); | |
179 | ||
180 | /* This goes through the tasks list and kills them all. This | |
181 | * is repeated until no further processes are added to the | |
182 | * tasks list, to properly handle forking processes */ | |
183 | ||
184 | if (!(s = set_new(trivial_hash_func, trivial_compare_func))) | |
185 | return -ENOMEM; | |
186 | ||
187 | my_pid = getpid(); | |
188 | ||
189 | do { | |
c6c18be3 | 190 | pid_t pid; |
8c6db833 LP |
191 | done = true; |
192 | ||
35d2e7ec | 193 | if ((r = cg_enumerate_processes(controller, path, &f)) < 0) { |
4c633005 | 194 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec LP |
195 | ret = r; |
196 | ||
c6c18be3 | 197 | goto finish; |
35d2e7ec | 198 | } |
c6c18be3 LP |
199 | |
200 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 LP |
201 | |
202 | if (pid == my_pid && ignore_self) | |
c6c18be3 | 203 | continue; |
8c6db833 | 204 | |
c6c18be3 LP |
205 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
206 | continue; | |
8c6db833 LP |
207 | |
208 | /* If we haven't killed this process yet, kill | |
209 | * it */ | |
4c633005 LP |
210 | if (kill(pid, sig) < 0) { |
211 | if (ret >= 0 && errno != ESRCH) | |
8c6db833 | 212 | ret = -errno; |
35d2e7ec LP |
213 | } else if (ret == 0) |
214 | ret = 1; | |
8c6db833 | 215 | |
8c6db833 LP |
216 | done = false; |
217 | ||
35d2e7ec LP |
218 | if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) { |
219 | if (ret >= 0) | |
220 | ret = r; | |
221 | ||
222 | goto finish; | |
223 | } | |
224 | } | |
225 | ||
226 | if (r < 0) { | |
227 | if (ret >= 0) | |
228 | ret = r; | |
229 | ||
230 | goto finish; | |
8c6db833 LP |
231 | } |
232 | ||
c6c18be3 LP |
233 | fclose(f); |
234 | f = NULL; | |
8c6db833 LP |
235 | |
236 | /* To avoid racing against processes which fork | |
237 | * quicker than we can kill them we repeat this until | |
238 | * no new pids need to be killed. */ | |
239 | ||
35d2e7ec | 240 | } while (!done); |
8c6db833 | 241 | |
c6c18be3 | 242 | finish: |
8c6db833 LP |
243 | set_free(s); |
244 | ||
c6c18be3 LP |
245 | if (f) |
246 | fclose(f); | |
8c6db833 | 247 | |
35d2e7ec | 248 | return ret; |
8c6db833 LP |
249 | } |
250 | ||
35d2e7ec LP |
251 | int cg_kill_recursive(const char *controller, const char *path, int sig, bool ignore_self, bool rem) { |
252 | int r, ret = 0; | |
253 | DIR *d = NULL; | |
254 | char *fn; | |
8c6db833 LP |
255 | |
256 | assert(path); | |
257 | assert(controller); | |
258 | assert(sig >= 0); | |
259 | ||
35d2e7ec | 260 | ret = cg_kill(controller, path, sig, ignore_self); |
8c6db833 | 261 | |
35d2e7ec | 262 | if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) { |
4c633005 | 263 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec | 264 | ret = r; |
8c6db833 | 265 | |
35d2e7ec LP |
266 | goto finish; |
267 | } | |
8c6db833 | 268 | |
35d2e7ec LP |
269 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
270 | char *p = NULL; | |
8c6db833 | 271 | |
35d2e7ec LP |
272 | r = asprintf(&p, "%s/%s", path, fn); |
273 | free(fn); | |
274 | ||
275 | if (r < 0) { | |
276 | if (ret >= 0) | |
277 | ret = -ENOMEM; | |
8c6db833 | 278 | |
35d2e7ec LP |
279 | goto finish; |
280 | } | |
8c6db833 | 281 | |
35d2e7ec LP |
282 | r = cg_kill_recursive(controller, p, sig, ignore_self, rem); |
283 | free(p); | |
8c6db833 | 284 | |
35d2e7ec LP |
285 | if (r != 0 && ret >= 0) |
286 | ret = r; | |
8c6db833 LP |
287 | } |
288 | ||
35d2e7ec LP |
289 | if (r < 0 && ret >= 0) |
290 | ret = r; | |
291 | ||
292 | if (rem) | |
293 | if ((r = cg_rmdir(controller, path)) < 0) { | |
4c633005 | 294 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec LP |
295 | ret = r; |
296 | } | |
8c6db833 | 297 | |
35d2e7ec LP |
298 | finish: |
299 | if (d) | |
300 | closedir(d); | |
8c6db833 LP |
301 | |
302 | return ret; | |
303 | } | |
304 | ||
35d2e7ec | 305 | int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) { |
8c6db833 LP |
306 | unsigned i; |
307 | ||
308 | assert(path); | |
309 | assert(controller); | |
310 | ||
311 | /* This safely kills all processes; first it sends a SIGTERM, | |
312 | * then checks 8 times after 50ms whether the group is | |
313 | * now empty, and finally kills everything that is left with | |
314 | * SIGKILL */ | |
315 | ||
316 | for (i = 0; i < 10; i++) { | |
1d0ae74a | 317 | int sig, r; |
8c6db833 LP |
318 | |
319 | if (i <= 0) | |
320 | sig = SIGTERM; | |
321 | else if (i >= 9) | |
322 | sig = SIGKILL; | |
323 | else | |
324 | sig = 0; | |
325 | ||
35d2e7ec | 326 | if ((r = cg_kill_recursive(controller, path, sig, true, rem)) <= 0) |
8c6db833 LP |
327 | return r; |
328 | ||
329 | usleep(50 * USEC_PER_MSEC); | |
330 | } | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | int cg_migrate(const char *controller, const char *from, const char *to, bool ignore_self) { | |
35d2e7ec LP |
336 | bool done = false; |
337 | Set *s; | |
8c6db833 LP |
338 | int r, ret = 0; |
339 | pid_t my_pid; | |
c6c18be3 | 340 | FILE *f = NULL; |
8c6db833 LP |
341 | |
342 | assert(controller); | |
343 | assert(from); | |
344 | assert(to); | |
345 | ||
35d2e7ec LP |
346 | if (!(s = set_new(trivial_hash_func, trivial_compare_func))) |
347 | return -ENOMEM; | |
348 | ||
8c6db833 LP |
349 | my_pid = getpid(); |
350 | ||
351 | do { | |
c6c18be3 | 352 | pid_t pid; |
8c6db833 LP |
353 | done = true; |
354 | ||
35d2e7ec | 355 | if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) { |
4c633005 | 356 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec LP |
357 | ret = r; |
358 | ||
c6c18be3 | 359 | goto finish; |
35d2e7ec | 360 | } |
c6c18be3 LP |
361 | |
362 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
8c6db833 | 363 | |
35d2e7ec LP |
364 | /* This might do weird stuff if we aren't a |
365 | * single-threaded program. However, we | |
366 | * luckily know we are not */ | |
8c6db833 | 367 | if (pid == my_pid && ignore_self) |
c6c18be3 | 368 | continue; |
8c6db833 | 369 | |
35d2e7ec LP |
370 | if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid)) |
371 | continue; | |
372 | ||
c6c18be3 | 373 | if ((r = cg_attach(controller, to, pid)) < 0) { |
4c633005 | 374 | if (ret >= 0 && r != -ESRCH) |
35d2e7ec LP |
375 | ret = r; |
376 | } else if (ret == 0) | |
377 | ret = 1; | |
8c6db833 | 378 | |
8c6db833 | 379 | done = false; |
35d2e7ec LP |
380 | |
381 | if ((r = set_put(s, LONG_TO_PTR(pid))) < 0) { | |
382 | if (ret >= 0) | |
383 | ret = r; | |
384 | ||
385 | goto finish; | |
386 | } | |
387 | } | |
388 | ||
389 | if (r < 0) { | |
390 | if (ret >= 0) | |
391 | ret = r; | |
392 | ||
393 | goto finish; | |
8c6db833 LP |
394 | } |
395 | ||
c6c18be3 LP |
396 | fclose(f); |
397 | f = NULL; | |
8c6db833 | 398 | |
35d2e7ec | 399 | } while (!done); |
8c6db833 | 400 | |
c6c18be3 | 401 | finish: |
35d2e7ec | 402 | set_free(s); |
8c6db833 | 403 | |
c6c18be3 LP |
404 | if (f) |
405 | fclose(f); | |
8c6db833 | 406 | |
35d2e7ec | 407 | return ret; |
8c6db833 LP |
408 | } |
409 | ||
35d2e7ec LP |
410 | int cg_migrate_recursive(const char *controller, const char *from, const char *to, bool ignore_self, bool rem) { |
411 | int r, ret = 0; | |
412 | DIR *d = NULL; | |
413 | char *fn; | |
8c6db833 LP |
414 | |
415 | assert(controller); | |
416 | assert(from); | |
417 | assert(to); | |
418 | ||
35d2e7ec | 419 | ret = cg_migrate(controller, from, to, ignore_self); |
8c6db833 | 420 | |
35d2e7ec | 421 | if ((r = cg_enumerate_subgroups(controller, from, &d)) < 0) { |
4c633005 | 422 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec LP |
423 | ret = r; |
424 | goto finish; | |
425 | } | |
426 | ||
427 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
428 | char *p = NULL; | |
8c6db833 | 429 | |
35d2e7ec LP |
430 | r = asprintf(&p, "%s/%s", from, fn); |
431 | free(fn); | |
8c6db833 | 432 | |
35d2e7ec LP |
433 | if (r < 0) { |
434 | if (ret >= 0) | |
435 | ret = -ENOMEM; | |
436 | ||
437 | goto finish; | |
8c6db833 LP |
438 | } |
439 | ||
35d2e7ec | 440 | r = cg_migrate_recursive(controller, p, to, ignore_self, rem); |
8c6db833 LP |
441 | free(p); |
442 | ||
35d2e7ec LP |
443 | if (r != 0 && ret >= 0) |
444 | ret = r; | |
8c6db833 LP |
445 | } |
446 | ||
35d2e7ec LP |
447 | if (r < 0 && ret >= 0) |
448 | ret = r; | |
449 | ||
450 | if (rem) | |
451 | if ((r = cg_rmdir(controller, from)) < 0) { | |
4c633005 | 452 | if (ret >= 0 && r != -ENOENT) |
35d2e7ec LP |
453 | ret = r; |
454 | } | |
8c6db833 | 455 | |
35d2e7ec LP |
456 | finish: |
457 | if (d) | |
458 | closedir(d); | |
8c6db833 LP |
459 | |
460 | return ret; | |
461 | } | |
462 | ||
463 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
dbd821ac | 464 | const char *p; |
8c6db833 LP |
465 | char *mp; |
466 | int r; | |
467 | ||
468 | assert(controller); | |
dbd821ac LP |
469 | assert(fs); |
470 | ||
471 | /* This is a very minimal lookup from controller names to | |
472 | * paths. Since we have mounted most hierarchies ourselves | |
473 | * should be kinda safe, but eventually we might want to | |
474 | * extend this to have a fallback to actually check | |
475 | * /proc/mounts. Might need caching then. */ | |
476 | ||
477 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
478 | p = "systemd"; | |
479 | else if (startswith(controller, "name=")) | |
480 | p = controller + 5; | |
481 | else | |
482 | p = controller; | |
483 | ||
484 | if (asprintf(&mp, "/cgroup/%s", p) < 0) | |
485 | return -ENOMEM; | |
8c6db833 | 486 | |
dbd821ac LP |
487 | if ((r = path_is_mount_point(mp)) <= 0) { |
488 | free(mp); | |
489 | return r < 0 ? r : -ENOENT; | |
490 | } | |
8c6db833 | 491 | |
c6c18be3 | 492 | if (path && suffix) |
8c6db833 | 493 | r = asprintf(fs, "%s/%s/%s", mp, path, suffix); |
c6c18be3 | 494 | else if (path) |
8c6db833 | 495 | r = asprintf(fs, "%s/%s", mp, path); |
c6c18be3 LP |
496 | else if (suffix) |
497 | r = asprintf(fs, "%s/%s", mp, suffix); | |
498 | else { | |
499 | path_kill_slashes(mp); | |
500 | *fs = mp; | |
501 | return 0; | |
502 | } | |
8c6db833 LP |
503 | |
504 | free(mp); | |
c6c18be3 | 505 | path_kill_slashes(*fs); |
8c6db833 LP |
506 | return r < 0 ? -ENOMEM : 0; |
507 | } | |
508 | ||
509 | int cg_trim(const char *controller, const char *path, bool delete_root) { | |
510 | char *fs; | |
511 | int r; | |
512 | ||
513 | assert(controller); | |
514 | assert(path); | |
515 | ||
516 | if ((r = cg_get_path(controller, path, NULL, &fs)) < 0) | |
517 | return r; | |
518 | ||
519 | r = rm_rf(fs, true, delete_root); | |
520 | free(fs); | |
521 | ||
4c633005 | 522 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
523 | } |
524 | ||
525 | int cg_delete(const char *controller, const char *path) { | |
35d2e7ec | 526 | char *parent; |
8c6db833 LP |
527 | int r; |
528 | ||
529 | assert(controller); | |
530 | assert(path); | |
531 | ||
35d2e7ec LP |
532 | if ((r = parent_of_path(path, &parent)) < 0) |
533 | return r; | |
8c6db833 | 534 | |
35d2e7ec LP |
535 | r = cg_migrate_recursive(controller, path, parent, false, true); |
536 | free(parent); | |
8c6db833 | 537 | |
4c633005 | 538 | return r == -ENOENT ? 0 : r; |
8c6db833 LP |
539 | } |
540 | ||
541 | int cg_create(const char *controller, const char *path) { | |
c6c18be3 | 542 | char *fs; |
8c6db833 LP |
543 | int r; |
544 | ||
545 | assert(controller); | |
546 | assert(path); | |
547 | ||
c6c18be3 LP |
548 | if ((r = cg_get_path(controller, path, NULL, &fs)) < 0) |
549 | return r; | |
8c6db833 | 550 | |
672c48cc LP |
551 | r = mkdir_parents(fs, 0755); |
552 | ||
553 | if (r >= 0) { | |
554 | if (mkdir(fs, 0755) >= 0) | |
555 | r = 1; | |
556 | else if (errno == EEXIST) | |
557 | r = 0; | |
558 | else | |
559 | r = -errno; | |
560 | } | |
561 | ||
c6c18be3 | 562 | free(fs); |
8c6db833 LP |
563 | |
564 | return r; | |
565 | } | |
566 | ||
567 | int cg_attach(const char *controller, const char *path, pid_t pid) { | |
c6c18be3 | 568 | char *fs; |
8c6db833 | 569 | int r; |
c6c18be3 | 570 | char c[32]; |
8c6db833 LP |
571 | |
572 | assert(controller); | |
573 | assert(path); | |
574 | assert(pid >= 0); | |
575 | ||
c6c18be3 LP |
576 | if ((r = cg_get_path(controller, path, "tasks", &fs)) < 0) |
577 | return r; | |
8c6db833 LP |
578 | |
579 | if (pid == 0) | |
580 | pid = getpid(); | |
581 | ||
c6c18be3 LP |
582 | snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid); |
583 | char_array_0(c); | |
8c6db833 | 584 | |
c6c18be3 LP |
585 | r = write_one_line_file(fs, c); |
586 | free(fs); | |
8c6db833 LP |
587 | |
588 | return r; | |
589 | } | |
590 | ||
591 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
672c48cc | 592 | int r, q; |
8c6db833 LP |
593 | |
594 | assert(controller); | |
595 | assert(path); | |
596 | assert(pid >= 0); | |
597 | ||
c6c18be3 LP |
598 | if ((r = cg_create(controller, path)) < 0) |
599 | return r; | |
8c6db833 | 600 | |
672c48cc LP |
601 | if ((q = cg_attach(controller, path, pid)) < 0) |
602 | return q; | |
8c6db833 | 603 | |
c6c18be3 | 604 | /* This does not remove the cgroup on failure */ |
8c6db833 LP |
605 | |
606 | return r; | |
607 | } | |
608 | ||
609 | int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid) { | |
610 | char *fs; | |
611 | int r; | |
612 | ||
613 | assert(controller); | |
614 | assert(path); | |
615 | ||
616 | if ((r = cg_get_path(controller, path, NULL, &fs)) < 0) | |
617 | return r; | |
618 | ||
619 | r = chmod_and_chown(fs, mode, uid, gid); | |
620 | free(fs); | |
621 | ||
622 | return r; | |
623 | } | |
624 | ||
625 | int cg_set_task_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid) { | |
626 | char *fs; | |
627 | int r; | |
628 | ||
629 | assert(controller); | |
630 | assert(path); | |
631 | ||
632 | if ((r = cg_get_path(controller, path, "tasks", &fs)) < 0) | |
633 | return r; | |
634 | ||
635 | r = chmod_and_chown(fs, mode, uid, gid); | |
636 | free(fs); | |
637 | ||
638 | return r; | |
639 | } | |
640 | ||
641 | int cg_get_by_pid(const char *controller, pid_t pid, char **path) { | |
642 | int r; | |
643 | char *p = NULL; | |
c6c18be3 LP |
644 | FILE *f; |
645 | char *fs; | |
646 | size_t cs; | |
8c6db833 LP |
647 | |
648 | assert(controller); | |
8c6db833 | 649 | assert(path); |
c6c18be3 | 650 | assert(pid >= 0); |
8c6db833 | 651 | |
c6c18be3 LP |
652 | if (pid == 0) |
653 | pid = getpid(); | |
8c6db833 | 654 | |
c6c18be3 LP |
655 | if (asprintf(&fs, "/proc/%lu/cgroup", (unsigned long) pid) < 0) |
656 | return -ENOMEM; | |
8c6db833 | 657 | |
c6c18be3 LP |
658 | f = fopen(fs, "re"); |
659 | free(fs); | |
660 | ||
4c633005 LP |
661 | if (!f) |
662 | return errno == ENOENT ? -ESRCH : -errno; | |
663 | ||
c6c18be3 LP |
664 | cs = strlen(controller); |
665 | ||
666 | while (!feof(f)) { | |
667 | char line[LINE_MAX]; | |
668 | char *l; | |
669 | ||
670 | errno = 0; | |
671 | if (!(fgets(line, sizeof(line), f))) { | |
672 | if (feof(f)) | |
673 | break; | |
674 | ||
675 | r = errno ? -errno : -EIO; | |
676 | goto finish; | |
677 | } | |
678 | ||
679 | truncate_nl(line); | |
680 | ||
681 | if (!(l = strchr(line, ':'))) | |
682 | continue; | |
683 | ||
684 | l++; | |
685 | if (strncmp(l, controller, cs) != 0) | |
686 | continue; | |
687 | ||
688 | if (l[cs] != ':') | |
689 | continue; | |
690 | ||
691 | if (!(p = strdup(l + cs + 1))) { | |
692 | r = -ENOMEM; | |
693 | goto finish; | |
694 | } | |
695 | ||
696 | *path = p; | |
697 | r = 0; | |
698 | goto finish; | |
699 | } | |
700 | ||
701 | r = -ENOENT; | |
702 | ||
703 | finish: | |
704 | fclose(f); | |
705 | ||
706 | return r; | |
8c6db833 LP |
707 | } |
708 | ||
709 | int cg_install_release_agent(const char *controller, const char *agent) { | |
c6c18be3 | 710 | char *fs = NULL, *contents = NULL, *line = NULL, *sc; |
8c6db833 LP |
711 | int r; |
712 | ||
713 | assert(controller); | |
714 | assert(agent); | |
715 | ||
c6c18be3 LP |
716 | if ((r = cg_get_path(controller, NULL, "release_agent", &fs)) < 0) |
717 | return r; | |
8c6db833 | 718 | |
c6c18be3 | 719 | if ((r = read_one_line_file(fs, &contents)) < 0) |
8c6db833 LP |
720 | goto finish; |
721 | ||
722 | sc = strstrip(contents); | |
8c6db833 LP |
723 | if (sc[0] == 0) { |
724 | ||
725 | if (asprintf(&line, "%s\n", agent) < 0) { | |
726 | r = -ENOMEM; | |
727 | goto finish; | |
728 | } | |
729 | ||
c6c18be3 | 730 | if ((r = write_one_line_file(fs, line)) < 0) |
8c6db833 LP |
731 | goto finish; |
732 | ||
733 | } else if (!streq(sc, agent)) { | |
734 | r = -EEXIST; | |
735 | goto finish; | |
736 | } | |
737 | ||
c6c18be3 LP |
738 | free(fs); |
739 | fs = NULL; | |
740 | if ((r = cg_get_path(controller, NULL, "notify_on_release", &fs)) < 0) { | |
8c6db833 LP |
741 | r = -ENOMEM; |
742 | goto finish; | |
743 | } | |
744 | ||
745 | free(contents); | |
746 | contents = NULL; | |
c6c18be3 | 747 | if ((r = read_one_line_file(fs, &contents)) < 0) |
8c6db833 LP |
748 | goto finish; |
749 | ||
750 | sc = strstrip(contents); | |
751 | ||
752 | if (streq(sc, "0")) { | |
c6c18be3 | 753 | if ((r = write_one_line_file(fs, "1\n")) < 0) |
8c6db833 | 754 | goto finish; |
c6c18be3 LP |
755 | |
756 | r = 1; | |
8c6db833 LP |
757 | } else if (!streq(sc, "1")) { |
758 | r = -EIO; | |
759 | goto finish; | |
c6c18be3 LP |
760 | } else |
761 | r = 0; | |
8c6db833 LP |
762 | |
763 | finish: | |
c6c18be3 | 764 | free(fs); |
8c6db833 LP |
765 | free(contents); |
766 | free(line); | |
767 | ||
768 | return r; | |
769 | } | |
770 | ||
771 | int cg_is_empty(const char *controller, const char *path, bool ignore_self) { | |
c6c18be3 | 772 | pid_t pid; |
8c6db833 | 773 | int r; |
c6c18be3 LP |
774 | FILE *f; |
775 | bool found = false; | |
8c6db833 LP |
776 | |
777 | assert(controller); | |
778 | assert(path); | |
779 | ||
c6c18be3 | 780 | if ((r = cg_enumerate_tasks(controller, path, &f)) < 0) |
4c633005 | 781 | return r == -ENOENT ? 1 : r; |
8c6db833 | 782 | |
c6c18be3 | 783 | while ((r = cg_read_pid(f, &pid)) > 0) { |
8c6db833 | 784 | |
c6c18be3 LP |
785 | if (ignore_self && pid == getpid()) |
786 | continue; | |
8c6db833 | 787 | |
c6c18be3 LP |
788 | found = true; |
789 | break; | |
8c6db833 LP |
790 | } |
791 | ||
c6c18be3 | 792 | fclose(f); |
8c6db833 | 793 | |
c6c18be3 LP |
794 | if (r < 0) |
795 | return r; | |
8c6db833 | 796 | |
c6c18be3 | 797 | return !found; |
8c6db833 LP |
798 | } |
799 | ||
800 | int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) { | |
35d2e7ec LP |
801 | int r; |
802 | DIR *d = NULL; | |
803 | char *fn; | |
8c6db833 LP |
804 | |
805 | assert(controller); | |
806 | assert(path); | |
807 | ||
35d2e7ec LP |
808 | if ((r = cg_is_empty(controller, path, ignore_self)) <= 0) |
809 | return r; | |
810 | ||
811 | if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) | |
4c633005 | 812 | return r == -ENOENT ? 1 : r; |
8c6db833 | 813 | |
35d2e7ec LP |
814 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
815 | char *p = NULL; | |
8c6db833 | 816 | |
35d2e7ec LP |
817 | r = asprintf(&p, "%s/%s", path, fn); |
818 | free(fn); | |
8c6db833 | 819 | |
35d2e7ec LP |
820 | if (r < 0) { |
821 | r = -ENOMEM; | |
822 | goto finish; | |
8c6db833 LP |
823 | } |
824 | ||
35d2e7ec | 825 | r = cg_is_empty_recursive(controller, p, ignore_self); |
8c6db833 LP |
826 | free(p); |
827 | ||
35d2e7ec LP |
828 | if (r <= 0) |
829 | goto finish; | |
830 | } | |
831 | ||
832 | if (r >= 0) | |
833 | r = 1; | |
834 | ||
835 | finish: | |
836 | ||
837 | if (d) | |
838 | closedir(d); | |
839 | ||
840 | return r; | |
841 | } | |
842 | ||
843 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
844 | const char *e; | |
845 | char *t = NULL, *u = NULL; | |
846 | ||
847 | assert(spec); | |
848 | assert(controller || path); | |
849 | ||
850 | if (*spec == '/') { | |
851 | ||
852 | if (path) { | |
853 | if (!(t = strdup(spec))) | |
854 | return -ENOMEM; | |
855 | ||
856 | *path = t; | |
8c6db833 LP |
857 | } |
858 | ||
35d2e7ec LP |
859 | if (controller) |
860 | *controller = NULL; | |
861 | ||
862 | return 0; | |
8c6db833 LP |
863 | } |
864 | ||
35d2e7ec LP |
865 | if (!(e = strchr(spec, ':'))) { |
866 | ||
867 | if (strchr(spec, '/') || spec[0] == 0) | |
868 | return -EINVAL; | |
869 | ||
870 | if (controller) { | |
871 | if (!(t = strdup(spec))) | |
872 | return -ENOMEM; | |
873 | ||
874 | *controller = t; | |
875 | } | |
876 | ||
877 | if (path) | |
878 | *path = NULL; | |
879 | ||
880 | return 0; | |
8c6db833 LP |
881 | } |
882 | ||
35d2e7ec LP |
883 | if (e[1] != '/' || |
884 | e == spec || | |
885 | memchr(spec, '/', e-spec)) | |
886 | return -EINVAL; | |
8c6db833 | 887 | |
35d2e7ec LP |
888 | if (controller) |
889 | if (!(t = strndup(spec, e-spec))) | |
890 | return -ENOMEM; | |
891 | ||
892 | if (path) | |
893 | if (!(u = strdup(e+1))) { | |
894 | free(t); | |
895 | return -ENOMEM; | |
896 | } | |
897 | ||
898 | if (controller) | |
899 | *controller = t; | |
900 | ||
901 | if (path) | |
902 | *path = u; | |
903 | ||
904 | return 0; | |
8c6db833 | 905 | } |
c6c18be3 | 906 | |
35d2e7ec LP |
907 | int cg_join_spec(const char *controller, const char *path, char **spec) { |
908 | assert(controller); | |
909 | assert(path); | |
c6c18be3 | 910 | |
35d2e7ec LP |
911 | if (!path_is_absolute(path) || |
912 | controller[0] == 0 || | |
913 | strchr(controller, ':') || | |
914 | strchr(controller, '/')) | |
915 | return -EINVAL; | |
916 | ||
917 | if (asprintf(spec, "%s:%s", controller, path) < 0) | |
918 | return -ENOMEM; | |
c6c18be3 LP |
919 | |
920 | return 0; | |
921 | } | |
35d2e7ec LP |
922 | |
923 | int cg_fix_path(const char *path, char **result) { | |
924 | char *t, *c, *p; | |
925 | int r; | |
926 | ||
927 | assert(path); | |
928 | assert(result); | |
929 | ||
930 | /* First check if it already is a filesystem path */ | |
931 | if (path_is_absolute(path) && | |
932 | path_startswith(path, "/cgroup") && | |
933 | access(path, F_OK) >= 0) { | |
934 | ||
935 | if (!(t = strdup(path))) | |
936 | return -ENOMEM; | |
937 | ||
938 | *result = t; | |
939 | return 0; | |
940 | } | |
941 | ||
942 | /* Otherwise treat it as cg spec */ | |
943 | if ((r = cg_split_spec(path, &c, &p)) < 0) | |
944 | return r; | |
945 | ||
946 | r = cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result); | |
947 | free(c); | |
948 | free(p); | |
949 | ||
950 | return r; | |
951 | } |