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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
8c6db833 LP |
2 | |
3 | #include <errno.h> | |
11c3a366 | 4 | #include <limits.h> |
8c6db833 | 5 | #include <signal.h> |
11c3a366 | 6 | #include <stddef.h> |
8c6db833 | 7 | #include <stdlib.h> |
672c48cc | 8 | #include <sys/types.h> |
f98c2585 | 9 | #include <sys/utsname.h> |
4b58153d | 10 | #include <sys/xattr.h> |
84ac7bea | 11 | #include <unistd.h> |
8c6db833 | 12 | |
b5efdb8a | 13 | #include "alloc-util.h" |
3ffd4af2 | 14 | #include "cgroup-util.h" |
28db6fbf | 15 | #include "constants.h" |
a0956174 | 16 | #include "dirent-util.h" |
84ac7bea | 17 | #include "extract-word.h" |
3ffd4af2 | 18 | #include "fd-util.h" |
84ac7bea | 19 | #include "fileio.h" |
f97b34a6 | 20 | #include "format-util.h" |
f4f15635 | 21 | #include "fs-util.h" |
93cc7779 | 22 | #include "log.h" |
84ac7bea LP |
23 | #include "login-util.h" |
24 | #include "macro.h" | |
f5947a5e | 25 | #include "missing_magic.h" |
5545f336 | 26 | #include "missing_threads.h" |
84ac7bea | 27 | #include "mkdir.h" |
6bedfcbb | 28 | #include "parse-util.h" |
9eb977db | 29 | #include "path-util.h" |
84ac7bea LP |
30 | #include "process-util.h" |
31 | #include "set.h" | |
9444b1f2 | 32 | #include "special.h" |
872a590e | 33 | #include "stat-util.h" |
d054f0a4 | 34 | #include "stdio-util.h" |
8b43440b | 35 | #include "string-table.h" |
07630cea | 36 | #include "string-util.h" |
aae7e17f | 37 | #include "strv.h" |
84ac7bea | 38 | #include "unit-name.h" |
b1d4f8e1 | 39 | #include "user-util.h" |
baa358df | 40 | #include "xattr-util.h" |
8c6db833 | 41 | |
aef43552 | 42 | static int cg_enumerate_items(const char *controller, const char *path, FILE **ret, const char *item) { |
7027ff61 | 43 | _cleanup_free_ char *fs = NULL; |
c6c18be3 | 44 | FILE *f; |
7027ff61 | 45 | int r; |
c6c18be3 | 46 | |
aef43552 | 47 | assert(ret); |
c6c18be3 | 48 | |
e48fcfef | 49 | r = cg_get_path(controller, path, item, &fs); |
c3175a7f | 50 | if (r < 0) |
c6c18be3 LP |
51 | return r; |
52 | ||
53 | f = fopen(fs, "re"); | |
c6c18be3 LP |
54 | if (!f) |
55 | return -errno; | |
56 | ||
aef43552 | 57 | *ret = f; |
c6c18be3 LP |
58 | return 0; |
59 | } | |
60 | ||
aef43552 LP |
61 | int cg_enumerate_processes(const char *controller, const char *path, FILE **ret) { |
62 | return cg_enumerate_items(controller, path, ret, "cgroup.procs"); | |
e48fcfef TM |
63 | } |
64 | ||
aef43552 | 65 | int cg_read_pid(FILE *f, pid_t *ret) { |
c6c18be3 LP |
66 | unsigned long ul; |
67 | ||
aef43552 | 68 | /* Note that the cgroup.procs might contain duplicates! See cgroups.txt for details. */ |
c6c18be3 | 69 | |
7027ff61 | 70 | assert(f); |
aef43552 | 71 | assert(ret); |
7027ff61 | 72 | |
c6c18be3 LP |
73 | errno = 0; |
74 | if (fscanf(f, "%lu", &ul) != 1) { | |
75 | ||
8ab40789 LP |
76 | if (feof(f)) { |
77 | *ret = 0; | |
c6c18be3 | 78 | return 0; |
8ab40789 | 79 | } |
c6c18be3 | 80 | |
66855de7 | 81 | return errno_or_else(EIO); |
c6c18be3 LP |
82 | } |
83 | ||
84 | if (ul <= 0) | |
85 | return -EIO; | |
5ed7cdfb LP |
86 | if (ul > PID_T_MAX) |
87 | return -EIO; | |
c6c18be3 | 88 | |
aef43552 | 89 | *ret = (pid_t) ul; |
c6c18be3 LP |
90 | return 1; |
91 | } | |
92 | ||
12c7d27b LP |
93 | int cg_read_pidref(FILE *f, PidRef *ret) { |
94 | int r; | |
95 | ||
96 | assert(f); | |
97 | assert(ret); | |
98 | ||
99 | for (;;) { | |
100 | pid_t pid; | |
101 | ||
102 | r = cg_read_pid(f, &pid); | |
103 | if (r < 0) | |
104 | return r; | |
105 | if (r == 0) { | |
106 | *ret = PIDREF_NULL; | |
107 | return 0; | |
108 | } | |
109 | ||
110 | r = pidref_set_pid(ret, pid); | |
111 | if (r >= 0) | |
112 | return 1; | |
113 | if (r != -ESRCH) | |
114 | return r; | |
115 | ||
116 | /* ESRCH → gone by now? just skip over it, read the next */ | |
117 | } | |
118 | } | |
119 | ||
8b238b13 LP |
120 | int cg_read_event( |
121 | const char *controller, | |
122 | const char *path, | |
123 | const char *event, | |
31a9be23 | 124 | char **ret) { |
8b238b13 | 125 | |
ab2c3861 | 126 | _cleanup_free_ char *events = NULL, *content = NULL; |
ab2c3861 TH |
127 | int r; |
128 | ||
129 | r = cg_get_path(controller, path, "cgroup.events", &events); | |
130 | if (r < 0) | |
131 | return r; | |
132 | ||
627055ce | 133 | r = read_full_virtual_file(events, &content, NULL); |
ab2c3861 TH |
134 | if (r < 0) |
135 | return r; | |
136 | ||
31a9be23 YW |
137 | for (const char *p = content;;) { |
138 | _cleanup_free_ char *line = NULL, *key = NULL, *val = NULL; | |
139 | const char *q; | |
140 | ||
141 | r = extract_first_word(&p, &line, "\n", 0); | |
142 | if (r < 0) | |
143 | return r; | |
144 | if (r == 0) | |
145 | return -ENOENT; | |
146 | ||
147 | q = line; | |
148 | r = extract_first_word(&q, &key, " ", 0); | |
149 | if (r < 0) | |
150 | return r; | |
151 | if (r == 0) | |
ab2c3861 TH |
152 | return -EINVAL; |
153 | ||
31a9be23 | 154 | if (!streq(key, event)) |
ab2c3861 TH |
155 | continue; |
156 | ||
31a9be23 YW |
157 | val = strdup(q); |
158 | if (!val) | |
159 | return -ENOMEM; | |
160 | ||
161 | *ret = TAKE_PTR(val); | |
ab2c3861 TH |
162 | return 0; |
163 | } | |
ab2c3861 TH |
164 | } |
165 | ||
3228995c CB |
166 | bool cg_ns_supported(void) { |
167 | static thread_local int enabled = -1; | |
168 | ||
169 | if (enabled >= 0) | |
170 | return enabled; | |
171 | ||
0887fa71 LP |
172 | if (access("/proc/self/ns/cgroup", F_OK) < 0) { |
173 | if (errno != ENOENT) | |
174 | log_debug_errno(errno, "Failed to check whether /proc/self/ns/cgroup is available, assuming not: %m"); | |
175 | enabled = false; | |
176 | } else | |
177 | enabled = true; | |
3228995c CB |
178 | |
179 | return enabled; | |
180 | } | |
181 | ||
d9e45bc3 MS |
182 | bool cg_freezer_supported(void) { |
183 | static thread_local int supported = -1; | |
184 | ||
185 | if (supported >= 0) | |
186 | return supported; | |
187 | ||
188 | supported = cg_all_unified() > 0 && access("/sys/fs/cgroup/init.scope/cgroup.freeze", F_OK) == 0; | |
189 | ||
190 | return supported; | |
191 | } | |
192 | ||
8a513eee AB |
193 | bool cg_kill_supported(void) { |
194 | static thread_local int supported = -1; | |
195 | ||
196 | if (supported >= 0) | |
197 | return supported; | |
198 | ||
199 | if (cg_all_unified() <= 0) | |
200 | supported = false; | |
201 | else if (access("/sys/fs/cgroup/init.scope/cgroup.kill", F_OK) < 0) { | |
202 | if (errno != ENOENT) | |
203 | log_debug_errno(errno, "Failed to check if cgroup.kill is available, assuming not: %m"); | |
204 | supported = false; | |
205 | } else | |
206 | supported = true; | |
207 | ||
208 | return supported; | |
209 | } | |
210 | ||
aef43552 | 211 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **ret) { |
7027ff61 | 212 | _cleanup_free_ char *fs = NULL; |
35d2e7ec | 213 | DIR *d; |
aef43552 | 214 | int r; |
35d2e7ec | 215 | |
aef43552 | 216 | assert(ret); |
35d2e7ec LP |
217 | |
218 | /* This is not recursive! */ | |
219 | ||
c3175a7f LP |
220 | r = cg_get_path(controller, path, NULL, &fs); |
221 | if (r < 0) | |
35d2e7ec LP |
222 | return r; |
223 | ||
224 | d = opendir(fs); | |
35d2e7ec LP |
225 | if (!d) |
226 | return -errno; | |
227 | ||
aef43552 | 228 | *ret = d; |
35d2e7ec LP |
229 | return 0; |
230 | } | |
231 | ||
aef43552 | 232 | int cg_read_subgroup(DIR *d, char **ret) { |
35d2e7ec | 233 | assert(d); |
aef43552 | 234 | assert(ret); |
35d2e7ec | 235 | |
f01327ad | 236 | FOREACH_DIRENT_ALL(de, d, return -errno) { |
35d2e7ec LP |
237 | char *b; |
238 | ||
239 | if (de->d_type != DT_DIR) | |
240 | continue; | |
241 | ||
49bfc877 | 242 | if (dot_or_dot_dot(de->d_name)) |
35d2e7ec LP |
243 | continue; |
244 | ||
7027ff61 LP |
245 | b = strdup(de->d_name); |
246 | if (!b) | |
35d2e7ec LP |
247 | return -ENOMEM; |
248 | ||
aef43552 | 249 | *ret = b; |
35d2e7ec LP |
250 | return 1; |
251 | } | |
252 | ||
8ab40789 | 253 | *ret = NULL; |
35d2e7ec LP |
254 | return 0; |
255 | } | |
256 | ||
4ad49000 | 257 | int cg_rmdir(const char *controller, const char *path) { |
7027ff61 | 258 | _cleanup_free_ char *p = NULL; |
35d2e7ec LP |
259 | int r; |
260 | ||
ad293f5a LP |
261 | r = cg_get_path(controller, path, NULL, &p); |
262 | if (r < 0) | |
35d2e7ec LP |
263 | return r; |
264 | ||
265 | r = rmdir(p); | |
7027ff61 LP |
266 | if (r < 0 && errno != ENOENT) |
267 | return -errno; | |
35d2e7ec | 268 | |
b4cccbc1 | 269 | r = cg_hybrid_unified(); |
f20db199 | 270 | if (r <= 0) |
b4cccbc1 | 271 | return r; |
b4cccbc1 LP |
272 | |
273 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
2977724b TH |
274 | r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path); |
275 | if (r < 0) | |
276 | log_warning_errno(r, "Failed to remove compat systemd cgroup %s: %m", path); | |
277 | } | |
278 | ||
7027ff61 | 279 | return 0; |
35d2e7ec LP |
280 | } |
281 | ||
e48fcfef | 282 | static int cg_kill_items( |
1d98fef1 LP |
283 | const char *path, |
284 | int sig, | |
285 | CGroupFlags flags, | |
286 | Set *s, | |
287 | cg_kill_log_func_t log_kill, | |
e48fcfef TM |
288 | void *userdata, |
289 | const char *item) { | |
1d98fef1 | 290 | |
7027ff61 | 291 | _cleanup_set_free_ Set *allocated_set = NULL; |
35d2e7ec | 292 | bool done = false; |
c53d2d54 | 293 | int r, ret = 0, ret_log_kill = 0; |
8c6db833 | 294 | |
8c6db833 LP |
295 | assert(sig >= 0); |
296 | ||
0d5b4810 LP |
297 | /* Don't send SIGCONT twice. Also, SIGKILL always works even when process is suspended, hence don't send |
298 | * SIGCONT on SIGKILL. */ | |
299 | if (IN_SET(sig, SIGCONT, SIGKILL)) | |
300 | flags &= ~CGROUP_SIGCONT; | |
301 | ||
8c6db833 LP |
302 | /* This goes through the tasks list and kills them all. This |
303 | * is repeated until no further processes are added to the | |
304 | * tasks list, to properly handle forking processes */ | |
305 | ||
7027ff61 | 306 | if (!s) { |
d5099efc | 307 | s = allocated_set = set_new(NULL); |
7027ff61 | 308 | if (!s) |
ca949c9d | 309 | return -ENOMEM; |
7027ff61 | 310 | } |
8c6db833 | 311 | |
8c6db833 | 312 | do { |
7027ff61 | 313 | _cleanup_fclose_ FILE *f = NULL; |
8c6db833 LP |
314 | done = true; |
315 | ||
bd1791b5 | 316 | r = cg_enumerate_items(SYSTEMD_CGROUP_CONTROLLER, path, &f, item); |
f65a40fb MY |
317 | if (r == -ENOENT) |
318 | break; | |
319 | if (r < 0) | |
320 | return RET_GATHER(ret, r); | |
c6c18be3 | 321 | |
4d1b2df1 LP |
322 | for (;;) { |
323 | _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL; | |
324 | ||
325 | r = cg_read_pidref(f, &pidref); | |
326 | if (r < 0) | |
f65a40fb | 327 | return RET_GATHER(ret, r); |
4d1b2df1 LP |
328 | if (r == 0) |
329 | break; | |
8c6db833 | 330 | |
4d1b2df1 | 331 | if ((flags & CGROUP_IGNORE_SELF) && pidref_is_self(&pidref)) |
c6c18be3 | 332 | continue; |
8c6db833 | 333 | |
4d1b2df1 | 334 | if (set_get(s, PID_TO_PTR(pidref.pid)) == PID_TO_PTR(pidref.pid)) |
c6c18be3 | 335 | continue; |
8c6db833 | 336 | |
1d98fef1 | 337 | if (log_kill) |
4d1b2df1 | 338 | ret_log_kill = log_kill(&pidref, sig, userdata); |
1d98fef1 | 339 | |
4d1b2df1 LP |
340 | /* If we haven't killed this process yet, kill it */ |
341 | r = pidref_kill(&pidref, sig); | |
f65a40fb MY |
342 | if (r < 0 && r != -ESRCH) |
343 | RET_GATHER(ret, r); | |
344 | if (r >= 0) { | |
1d98fef1 | 345 | if (flags & CGROUP_SIGCONT) |
4d1b2df1 | 346 | (void) pidref_kill(&pidref, SIGCONT); |
430c18ed | 347 | |
c53d2d54 DB |
348 | if (ret == 0) { |
349 | if (log_kill) | |
350 | ret = ret_log_kill; | |
351 | else | |
352 | ret = 1; | |
353 | } | |
430c18ed | 354 | } |
8c6db833 | 355 | |
8c6db833 LP |
356 | done = false; |
357 | ||
2d790175 | 358 | r = set_put(s, PID_TO_PTR(pidref.pid)); |
f65a40fb MY |
359 | if (r < 0) |
360 | return RET_GATHER(ret, r); | |
35d2e7ec LP |
361 | } |
362 | ||
f65a40fb MY |
363 | /* To avoid racing against processes which fork quicker than we can kill them, we repeat this |
364 | * until no new pids need to be killed. */ | |
8c6db833 | 365 | |
35d2e7ec | 366 | } while (!done); |
8c6db833 | 367 | |
35d2e7ec | 368 | return ret; |
8c6db833 LP |
369 | } |
370 | ||
e48fcfef | 371 | int cg_kill( |
e48fcfef TM |
372 | const char *path, |
373 | int sig, | |
374 | CGroupFlags flags, | |
375 | Set *s, | |
376 | cg_kill_log_func_t log_kill, | |
377 | void *userdata) { | |
37f0289b | 378 | |
379 | int r, ret; | |
e48fcfef | 380 | |
bd1791b5 | 381 | r = cg_kill_items(path, sig, flags, s, log_kill, userdata, "cgroup.procs"); |
e48fcfef TM |
382 | if (r < 0 || sig != SIGKILL) |
383 | return r; | |
384 | ||
37f0289b | 385 | ret = r; |
386 | ||
e48fcfef | 387 | /* Only in case of killing with SIGKILL and when using cgroupsv2, kill remaining threads manually as |
cda5ccdb TM |
388 | a workaround for kernel bug. It was fixed in 5.2-rc5 (c03cd7738a83), backported to 4.19.66 |
389 | (4340d175b898) and 4.14.138 (feb6b123b7dd). */ | |
bd1791b5 | 390 | r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER); |
37f0289b | 391 | if (r < 0) |
392 | return r; | |
393 | if (r == 0) | |
394 | return ret; | |
395 | ||
bd1791b5 | 396 | r = cg_kill_items(path, sig, flags, s, log_kill, userdata, "cgroup.threads"); |
37f0289b | 397 | if (r < 0) |
e48fcfef | 398 | return r; |
e48fcfef | 399 | |
37f0289b | 400 | return r > 0 || ret > 0; |
e48fcfef TM |
401 | } |
402 | ||
bd1791b5 LP |
403 | int cg_kill_kernel_sigkill(const char *path) { |
404 | /* Kills the cgroup at `path` directly by writing to its cgroup.kill file. This sends SIGKILL to all | |
405 | * processes in the cgroup and has the advantage of being completely atomic, unlike cg_kill_items(). */ | |
406 | ||
8a513eee | 407 | _cleanup_free_ char *killfile = NULL; |
bd1791b5 | 408 | int r; |
8a513eee AB |
409 | |
410 | assert(path); | |
411 | ||
412 | if (!cg_kill_supported()) | |
413 | return -EOPNOTSUPP; | |
414 | ||
bd1791b5 | 415 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, "cgroup.kill", &killfile); |
8a513eee AB |
416 | if (r < 0) |
417 | return r; | |
418 | ||
419 | r = write_string_file(killfile, "1", WRITE_STRING_FILE_DISABLE_BUFFER); | |
420 | if (r < 0) | |
421 | return r; | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
1d98fef1 | 426 | int cg_kill_recursive( |
1d98fef1 LP |
427 | const char *path, |
428 | int sig, | |
429 | CGroupFlags flags, | |
430 | Set *s, | |
431 | cg_kill_log_func_t log_kill, | |
432 | void *userdata) { | |
433 | ||
e155a0aa | 434 | int r, ret; |
8c6db833 LP |
435 | |
436 | assert(path); | |
8c6db833 LP |
437 | assert(sig >= 0); |
438 | ||
8a513eee | 439 | if (sig == SIGKILL && cg_kill_supported() && |
bd1791b5 | 440 | !FLAGS_SET(flags, CGROUP_IGNORE_SELF) && !s && !log_kill) |
8a513eee | 441 | /* ignore CGROUP_SIGCONT, since this is a no-op alongside SIGKILL */ |
bd1791b5 LP |
442 | ret = cg_kill_kernel_sigkill(path); |
443 | else { | |
444 | _cleanup_set_free_ Set *allocated_set = NULL; | |
445 | _cleanup_closedir_ DIR *d = NULL; | |
446 | ||
8a513eee AB |
447 | if (!s) { |
448 | s = allocated_set = set_new(NULL); | |
449 | if (!s) | |
450 | return -ENOMEM; | |
451 | } | |
ca949c9d | 452 | |
bd1791b5 | 453 | ret = cg_kill(path, sig, flags, s, log_kill, userdata); |
8c6db833 | 454 | |
bd1791b5 | 455 | r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d); |
8a513eee | 456 | if (r < 0) { |
bd1791b5 LP |
457 | if (r != -ENOENT) |
458 | RET_GATHER(ret, r); | |
8c6db833 | 459 | |
8a513eee AB |
460 | return ret; |
461 | } | |
8c6db833 | 462 | |
bd1791b5 LP |
463 | for (;;) { |
464 | _cleanup_free_ char *fn = NULL, *p = NULL; | |
465 | ||
466 | r = cg_read_subgroup(d, &fn); | |
467 | if (r < 0) { | |
468 | RET_GATHER(ret, r); | |
469 | break; | |
470 | } | |
471 | if (r == 0) | |
472 | break; | |
8c6db833 | 473 | |
8a513eee | 474 | p = path_join(empty_to_root(path), fn); |
8a513eee AB |
475 | if (!p) |
476 | return -ENOMEM; | |
8c6db833 | 477 | |
bd1791b5 | 478 | r = cg_kill_recursive(p, sig, flags, s, log_kill, userdata); |
8a513eee AB |
479 | if (r != 0 && ret >= 0) |
480 | ret = r; | |
481 | } | |
8c6db833 | 482 | } |
35d2e7ec | 483 | |
8a513eee | 484 | if (FLAGS_SET(flags, CGROUP_REMOVE)) { |
bd1791b5 LP |
485 | r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER, path); |
486 | if (!IN_SET(r, -ENOENT, -EBUSY)) | |
487 | RET_GATHER(ret, r); | |
7027ff61 | 488 | } |
ca949c9d | 489 | |
8c6db833 LP |
490 | return ret; |
491 | } | |
492 | ||
efdb0237 | 493 | static const char *controller_to_dirname(const char *controller) { |
7027ff61 LP |
494 | assert(controller); |
495 | ||
a561253f LP |
496 | /* Converts a controller name to the directory name below /sys/fs/cgroup/ we want to mount it |
497 | * to. Effectively, this just cuts off the name= prefixed used for named hierarchies, if it is | |
498 | * specified. */ | |
efdb0237 | 499 | |
2977724b | 500 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { |
b4cccbc1 | 501 | if (cg_hybrid_unified() > 0) |
2977724b TH |
502 | controller = SYSTEMD_CGROUP_CONTROLLER_HYBRID; |
503 | else | |
504 | controller = SYSTEMD_CGROUP_CONTROLLER_LEGACY; | |
505 | } | |
b6629c4b | 506 | |
a561253f | 507 | return startswith(controller, "name=") ?: controller; |
3474ae3c LP |
508 | } |
509 | ||
a561253f | 510 | static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **ret) { |
569b19d8 | 511 | const char *dn; |
018ef268 | 512 | char *t = NULL; |
3474ae3c | 513 | |
a561253f | 514 | assert(ret); |
569b19d8 LP |
515 | assert(controller); |
516 | ||
517 | dn = controller_to_dirname(controller); | |
efdb0237 LP |
518 | |
519 | if (isempty(path) && isempty(suffix)) | |
657ee2d8 | 520 | t = path_join("/sys/fs/cgroup", dn); |
efdb0237 | 521 | else if (isempty(path)) |
657ee2d8 | 522 | t = path_join("/sys/fs/cgroup", dn, suffix); |
efdb0237 | 523 | else if (isempty(suffix)) |
657ee2d8 | 524 | t = path_join("/sys/fs/cgroup", dn, path); |
efdb0237 | 525 | else |
657ee2d8 | 526 | t = path_join("/sys/fs/cgroup", dn, path, suffix); |
efdb0237 LP |
527 | if (!t) |
528 | return -ENOMEM; | |
3474ae3c | 529 | |
a561253f | 530 | *ret = t; |
efdb0237 LP |
531 | return 0; |
532 | } | |
533 | ||
a561253f | 534 | static int join_path_unified(const char *path, const char *suffix, char **ret) { |
efdb0237 LP |
535 | char *t; |
536 | ||
a561253f | 537 | assert(ret); |
efdb0237 LP |
538 | |
539 | if (isempty(path) && isempty(suffix)) | |
540 | t = strdup("/sys/fs/cgroup"); | |
541 | else if (isempty(path)) | |
657ee2d8 | 542 | t = path_join("/sys/fs/cgroup", suffix); |
efdb0237 | 543 | else if (isempty(suffix)) |
657ee2d8 | 544 | t = path_join("/sys/fs/cgroup", path); |
efdb0237 | 545 | else |
657ee2d8 | 546 | t = path_join("/sys/fs/cgroup", path, suffix); |
3474ae3c LP |
547 | if (!t) |
548 | return -ENOMEM; | |
549 | ||
a561253f | 550 | *ret = t; |
3474ae3c LP |
551 | return 0; |
552 | } | |
553 | ||
a561253f | 554 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **ret) { |
415fc41c | 555 | int r; |
8c6db833 | 556 | |
a561253f | 557 | assert(ret); |
dbd821ac | 558 | |
efdb0237 LP |
559 | if (!controller) { |
560 | char *t; | |
561 | ||
a561253f LP |
562 | /* If no controller is specified, we return the path *below* the controllers, without any |
563 | * prefix. */ | |
efdb0237 | 564 | |
74c60fcb | 565 | if (isempty(path) && isempty(suffix)) |
efdb0237 LP |
566 | return -EINVAL; |
567 | ||
a561253f | 568 | if (isempty(suffix)) |
efdb0237 | 569 | t = strdup(path); |
a561253f | 570 | else if (isempty(path)) |
efdb0237 LP |
571 | t = strdup(suffix); |
572 | else | |
657ee2d8 | 573 | t = path_join(path, suffix); |
efdb0237 LP |
574 | if (!t) |
575 | return -ENOMEM; | |
576 | ||
a561253f | 577 | *ret = path_simplify(t); |
efdb0237 LP |
578 | return 0; |
579 | } | |
580 | ||
581 | if (!cg_controller_is_valid(controller)) | |
78edb35a LP |
582 | return -EINVAL; |
583 | ||
b4cccbc1 LP |
584 | r = cg_all_unified(); |
585 | if (r < 0) | |
586 | return r; | |
587 | if (r > 0) | |
a561253f | 588 | r = join_path_unified(path, suffix, ret); |
569b19d8 | 589 | else |
a561253f | 590 | r = join_path_legacy(controller, path, suffix, ret); |
efdb0237 LP |
591 | if (r < 0) |
592 | return r; | |
7027ff61 | 593 | |
a561253f | 594 | path_simplify(*ret); |
efdb0237 | 595 | return 0; |
3474ae3c | 596 | } |
dbd821ac | 597 | |
0fa7b500 MK |
598 | static int controller_is_v1_accessible(const char *root, const char *controller) { |
599 | const char *cpath, *dn; | |
37099707 | 600 | |
efdb0237 | 601 | assert(controller); |
37099707 | 602 | |
81504017 | 603 | dn = controller_to_dirname(controller); |
0fa7b500 | 604 | |
e4645ca5 ZJS |
605 | /* If root if specified, we check that: |
606 | * - possible subcgroup is created at root, | |
607 | * - we can modify the hierarchy. */ | |
608 | ||
609 | cpath = strjoina("/sys/fs/cgroup/", dn, root, root ? "/cgroup.procs" : NULL); | |
cb3763d5 | 610 | return laccess(cpath, root ? W_OK : F_OK); |
37099707 LP |
611 | } |
612 | ||
820fe745 | 613 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **ret) { |
37099707 | 614 | int r; |
dbd821ac | 615 | |
efdb0237 | 616 | assert(controller); |
820fe745 | 617 | assert(ret); |
70132bd0 | 618 | |
81504017 MK |
619 | if (!cg_controller_is_valid(controller)) |
620 | return -EINVAL; | |
621 | ||
622 | r = cg_all_unified(); | |
37099707 LP |
623 | if (r < 0) |
624 | return r; | |
81504017 MK |
625 | if (r > 0) { |
626 | /* In the unified hierarchy all controllers are considered accessible, | |
627 | * except for the named hierarchies */ | |
628 | if (startswith(controller, "name=")) | |
629 | return -EOPNOTSUPP; | |
630 | } else { | |
631 | /* Check if the specified controller is actually accessible */ | |
0fa7b500 | 632 | r = controller_is_v1_accessible(NULL, controller); |
81504017 MK |
633 | if (r < 0) |
634 | return r; | |
635 | } | |
3474ae3c | 636 | |
820fe745 | 637 | return cg_get_path(controller, path, suffix, ret); |
8c6db833 LP |
638 | } |
639 | ||
bd1791b5 | 640 | int cg_set_xattr(const char *path, const char *name, const void *value, size_t size, int flags) { |
4b58153d LP |
641 | _cleanup_free_ char *fs = NULL; |
642 | int r; | |
643 | ||
644 | assert(path); | |
645 | assert(name); | |
646 | assert(value || size <= 0); | |
647 | ||
bd1791b5 | 648 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs); |
4b58153d LP |
649 | if (r < 0) |
650 | return r; | |
651 | ||
7c248223 | 652 | return RET_NERRNO(setxattr(fs, name, value, size, flags)); |
4b58153d LP |
653 | } |
654 | ||
bd1791b5 | 655 | int cg_get_xattr(const char *path, const char *name, void *value, size_t size) { |
4b58153d LP |
656 | _cleanup_free_ char *fs = NULL; |
657 | ssize_t n; | |
658 | int r; | |
659 | ||
660 | assert(path); | |
661 | assert(name); | |
662 | ||
bd1791b5 | 663 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs); |
4b58153d LP |
664 | if (r < 0) |
665 | return r; | |
666 | ||
667 | n = getxattr(fs, name, value, size); | |
668 | if (n < 0) | |
669 | return -errno; | |
670 | ||
671 | return (int) n; | |
672 | } | |
673 | ||
bd1791b5 | 674 | int cg_get_xattr_malloc(const char *path, const char *name, char **ret) { |
baa358df AZ |
675 | _cleanup_free_ char *fs = NULL; |
676 | int r; | |
677 | ||
678 | assert(path); | |
679 | assert(name); | |
680 | ||
bd1791b5 | 681 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs); |
baa358df AZ |
682 | if (r < 0) |
683 | return r; | |
684 | ||
bd1791b5 | 685 | return lgetxattr_malloc(fs, name, ret); |
baa358df AZ |
686 | } |
687 | ||
bd1791b5 | 688 | int cg_get_xattr_bool(const char *path, const char *name) { |
f0b8ac9e | 689 | _cleanup_free_ char *fs = NULL; |
59331b8e AZ |
690 | int r; |
691 | ||
692 | assert(path); | |
693 | assert(name); | |
694 | ||
f0b8ac9e | 695 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs); |
59331b8e AZ |
696 | if (r < 0) |
697 | return r; | |
698 | ||
f0b8ac9e | 699 | return getxattr_at_bool(AT_FDCWD, fs, name, /* flags= */ 0); |
59331b8e AZ |
700 | } |
701 | ||
bd1791b5 | 702 | int cg_remove_xattr(const char *path, const char *name) { |
bf25f165 LP |
703 | _cleanup_free_ char *fs = NULL; |
704 | int r; | |
705 | ||
706 | assert(path); | |
707 | assert(name); | |
708 | ||
bd1791b5 | 709 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs); |
bf25f165 LP |
710 | if (r < 0) |
711 | return r; | |
712 | ||
7c248223 | 713 | return RET_NERRNO(removexattr(fs, name)); |
bf25f165 LP |
714 | } |
715 | ||
ae7ef63f | 716 | int cg_pid_get_path(const char *controller, pid_t pid, char **ret_path) { |
7027ff61 | 717 | _cleanup_fclose_ FILE *f = NULL; |
7756528e | 718 | const char *fs, *controller_str = NULL; /* avoid false maybe-uninitialized warning */ |
d2b39cb6 | 719 | int unified, r; |
8c6db833 | 720 | |
c6c18be3 | 721 | assert(pid >= 0); |
ae7ef63f | 722 | assert(ret_path); |
8c6db833 | 723 | |
5da38d07 TH |
724 | if (controller) { |
725 | if (!cg_controller_is_valid(controller)) | |
726 | return -EINVAL; | |
727 | } else | |
728 | controller = SYSTEMD_CGROUP_CONTROLLER; | |
729 | ||
c22800e4 | 730 | unified = cg_unified_controller(controller); |
b4cccbc1 LP |
731 | if (unified < 0) |
732 | return unified; | |
733 | if (unified == 0) { | |
b6629c4b TH |
734 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) |
735 | controller_str = SYSTEMD_CGROUP_CONTROLLER_LEGACY; | |
736 | else | |
737 | controller_str = controller; | |
b6629c4b | 738 | } |
7027ff61 | 739 | |
b68fa010 | 740 | fs = procfs_file_alloca(pid, "cgroup"); |
fdeea3f4 ZJS |
741 | r = fopen_unlocked(fs, "re", &f); |
742 | if (r == -ENOENT) | |
743 | return -ESRCH; | |
744 | if (r < 0) | |
745 | return r; | |
35bbbf85 | 746 | |
d2b39cb6 LP |
747 | for (;;) { |
748 | _cleanup_free_ char *line = NULL; | |
ae7ef63f | 749 | char *e; |
c6c18be3 | 750 | |
d2b39cb6 LP |
751 | r = read_line(f, LONG_LINE_MAX, &line); |
752 | if (r < 0) | |
753 | return r; | |
754 | if (r == 0) | |
ae7ef63f | 755 | return -ENODATA; |
c6c18be3 | 756 | |
efdb0237 LP |
757 | if (unified) { |
758 | e = startswith(line, "0:"); | |
759 | if (!e) | |
760 | continue; | |
c6c18be3 | 761 | |
efdb0237 LP |
762 | e = strchr(e, ':'); |
763 | if (!e) | |
764 | continue; | |
765 | } else { | |
766 | char *l; | |
efdb0237 LP |
767 | |
768 | l = strchr(line, ':'); | |
769 | if (!l) | |
770 | continue; | |
8af8afd6 | 771 | |
efdb0237 LP |
772 | l++; |
773 | e = strchr(l, ':'); | |
774 | if (!e) | |
775 | continue; | |
efdb0237 | 776 | *e = 0; |
ae7ef63f | 777 | |
bc20c31b | 778 | assert(controller_str); |
ae7ef63f ZJS |
779 | r = string_contains_word(l, ",", controller_str); |
780 | if (r < 0) | |
781 | return r; | |
782 | if (r == 0) | |
efdb0237 | 783 | continue; |
8af8afd6 LP |
784 | } |
785 | ||
ae7ef63f ZJS |
786 | char *path = strdup(e + 1); |
787 | if (!path) | |
7027ff61 | 788 | return -ENOMEM; |
c6c18be3 | 789 | |
5e20b0a4 | 790 | /* Truncate suffix indicating the process is a zombie */ |
ae7ef63f | 791 | e = endswith(path, " (deleted)"); |
5e20b0a4 LP |
792 | if (e) |
793 | *e = 0; | |
794 | ||
ae7ef63f | 795 | *ret_path = path; |
7027ff61 | 796 | return 0; |
c6c18be3 | 797 | } |
8c6db833 LP |
798 | } |
799 | ||
f2a2e60b | 800 | int cg_pidref_get_path(const char *controller, const PidRef *pidref, char **ret_path) { |
a9062242 LP |
801 | _cleanup_free_ char *path = NULL; |
802 | int r; | |
803 | ||
804 | assert(ret_path); | |
805 | ||
806 | if (!pidref_is_set(pidref)) | |
807 | return -ESRCH; | |
808 | ||
809 | r = cg_pid_get_path(controller, pidref->pid, &path); | |
810 | if (r < 0) | |
811 | return r; | |
812 | ||
813 | /* Before we return the path, make sure the procfs entry for this pid still matches the pidref */ | |
814 | r = pidref_verify(pidref); | |
815 | if (r < 0) | |
816 | return r; | |
817 | ||
818 | *ret_path = TAKE_PTR(path); | |
819 | return 0; | |
820 | } | |
821 | ||
8c6db833 | 822 | int cg_install_release_agent(const char *controller, const char *agent) { |
7027ff61 | 823 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
efdb0237 | 824 | const char *sc; |
415fc41c | 825 | int r; |
8c6db833 | 826 | |
8c6db833 LP |
827 | assert(agent); |
828 | ||
c22800e4 | 829 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
830 | if (r < 0) |
831 | return r; | |
832 | if (r > 0) /* doesn't apply to unified hierarchy */ | |
efdb0237 LP |
833 | return -EOPNOTSUPP; |
834 | ||
7027ff61 LP |
835 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
836 | if (r < 0) | |
c6c18be3 | 837 | return r; |
8c6db833 | 838 | |
7027ff61 LP |
839 | r = read_one_line_file(fs, &contents); |
840 | if (r < 0) | |
841 | return r; | |
8c6db833 LP |
842 | |
843 | sc = strstrip(contents); | |
e155a0aa | 844 | if (isempty(sc)) { |
604028de | 845 | r = write_string_file(fs, agent, WRITE_STRING_FILE_DISABLE_BUFFER); |
574d5f2d | 846 | if (r < 0) |
7027ff61 | 847 | return r; |
b8725df8 | 848 | } else if (!path_equal(sc, agent)) |
7027ff61 | 849 | return -EEXIST; |
8c6db833 | 850 | |
0da16248 | 851 | fs = mfree(fs); |
7027ff61 LP |
852 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
853 | if (r < 0) | |
854 | return r; | |
8c6db833 | 855 | |
0da16248 | 856 | contents = mfree(contents); |
7027ff61 LP |
857 | r = read_one_line_file(fs, &contents); |
858 | if (r < 0) | |
859 | return r; | |
8c6db833 LP |
860 | |
861 | sc = strstrip(contents); | |
8c6db833 | 862 | if (streq(sc, "0")) { |
604028de | 863 | r = write_string_file(fs, "1", WRITE_STRING_FILE_DISABLE_BUFFER); |
7027ff61 LP |
864 | if (r < 0) |
865 | return r; | |
c6c18be3 | 866 | |
7027ff61 LP |
867 | return 1; |
868 | } | |
8c6db833 | 869 | |
7027ff61 LP |
870 | if (!streq(sc, "1")) |
871 | return -EIO; | |
8c6db833 | 872 | |
7027ff61 | 873 | return 0; |
8c6db833 LP |
874 | } |
875 | ||
ad929bcc KS |
876 | int cg_uninstall_release_agent(const char *controller) { |
877 | _cleanup_free_ char *fs = NULL; | |
415fc41c | 878 | int r; |
efdb0237 | 879 | |
c22800e4 | 880 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
881 | if (r < 0) |
882 | return r; | |
883 | if (r > 0) /* Doesn't apply to unified hierarchy */ | |
efdb0237 | 884 | return -EOPNOTSUPP; |
ad929bcc | 885 | |
ac9ef333 LP |
886 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); |
887 | if (r < 0) | |
888 | return r; | |
889 | ||
604028de | 890 | r = write_string_file(fs, "0", WRITE_STRING_FILE_DISABLE_BUFFER); |
ac9ef333 LP |
891 | if (r < 0) |
892 | return r; | |
893 | ||
0da16248 | 894 | fs = mfree(fs); |
ac9ef333 | 895 | |
ad929bcc KS |
896 | r = cg_get_path(controller, NULL, "release_agent", &fs); |
897 | if (r < 0) | |
898 | return r; | |
899 | ||
604028de | 900 | r = write_string_file(fs, "", WRITE_STRING_FILE_DISABLE_BUFFER); |
ad929bcc KS |
901 | if (r < 0) |
902 | return r; | |
903 | ||
ac9ef333 | 904 | return 0; |
ad929bcc KS |
905 | } |
906 | ||
6f883237 | 907 | int cg_is_empty(const char *controller, const char *path) { |
7027ff61 | 908 | _cleanup_fclose_ FILE *f = NULL; |
efdb0237 | 909 | pid_t pid; |
7027ff61 | 910 | int r; |
8c6db833 | 911 | |
8c6db833 LP |
912 | assert(path); |
913 | ||
b043cd0b | 914 | r = cg_enumerate_processes(controller, path, &f); |
6f883237 | 915 | if (r == -ENOENT) |
1bcf3fc6 | 916 | return true; |
c3175a7f | 917 | if (r < 0) |
6f883237 | 918 | return r; |
8c6db833 | 919 | |
6f883237 | 920 | r = cg_read_pid(f, &pid); |
c6c18be3 LP |
921 | if (r < 0) |
922 | return r; | |
8c6db833 | 923 | |
6f883237 | 924 | return r == 0; |
8c6db833 LP |
925 | } |
926 | ||
6f883237 | 927 | int cg_is_empty_recursive(const char *controller, const char *path) { |
415fc41c | 928 | int r; |
8c6db833 | 929 | |
8c6db833 LP |
930 | assert(path); |
931 | ||
6fd66507 | 932 | /* The root cgroup is always populated */ |
57ea45e1 | 933 | if (controller && empty_or_root(path)) |
efdb0237 | 934 | return false; |
6fd66507 | 935 | |
c22800e4 | 936 | r = cg_unified_controller(controller); |
b4cccbc1 LP |
937 | if (r < 0) |
938 | return r; | |
939 | if (r > 0) { | |
ab2c3861 | 940 | _cleanup_free_ char *t = NULL; |
8c6db833 | 941 | |
efdb0237 | 942 | /* On the unified hierarchy we can check empty state |
ab2c3861 | 943 | * via the "populated" attribute of "cgroup.events". */ |
8c6db833 | 944 | |
ab2c3861 | 945 | r = cg_read_event(controller, path, "populated", &t); |
1bcf3fc6 ZJS |
946 | if (r == -ENOENT) |
947 | return true; | |
efdb0237 LP |
948 | if (r < 0) |
949 | return r; | |
950 | ||
951 | return streq(t, "0"); | |
952 | } else { | |
953 | _cleanup_closedir_ DIR *d = NULL; | |
954 | char *fn; | |
8c6db833 | 955 | |
efdb0237 | 956 | r = cg_is_empty(controller, path); |
35d2e7ec | 957 | if (r <= 0) |
7027ff61 | 958 | return r; |
35d2e7ec | 959 | |
efdb0237 LP |
960 | r = cg_enumerate_subgroups(controller, path, &d); |
961 | if (r == -ENOENT) | |
1bcf3fc6 | 962 | return true; |
efdb0237 LP |
963 | if (r < 0) |
964 | return r; | |
35d2e7ec | 965 | |
efdb0237 LP |
966 | while ((r = cg_read_subgroup(d, &fn)) > 0) { |
967 | _cleanup_free_ char *p = NULL; | |
968 | ||
657ee2d8 | 969 | p = path_join(path, fn); |
efdb0237 LP |
970 | free(fn); |
971 | if (!p) | |
972 | return -ENOMEM; | |
973 | ||
974 | r = cg_is_empty_recursive(controller, p); | |
975 | if (r <= 0) | |
976 | return r; | |
977 | } | |
978 | if (r < 0) | |
979 | return r; | |
980 | ||
981 | return true; | |
982 | } | |
35d2e7ec LP |
983 | } |
984 | ||
2a8020fe ZJS |
985 | int cg_split_spec(const char *spec, char **ret_controller, char **ret_path) { |
986 | _cleanup_free_ char *controller = NULL, *path = NULL; | |
660087dc | 987 | int r; |
35d2e7ec LP |
988 | |
989 | assert(spec); | |
35d2e7ec LP |
990 | |
991 | if (*spec == '/') { | |
99be45a4 | 992 | if (!path_is_normalized(spec)) |
e884315e | 993 | return -EINVAL; |
35d2e7ec | 994 | |
2a8020fe | 995 | if (ret_path) { |
660087dc ZJS |
996 | r = path_simplify_alloc(spec, &path); |
997 | if (r < 0) | |
998 | return r; | |
8c6db833 LP |
999 | } |
1000 | ||
2a8020fe ZJS |
1001 | } else { |
1002 | const char *e; | |
35d2e7ec | 1003 | |
2a8020fe ZJS |
1004 | e = strchr(spec, ':'); |
1005 | if (e) { | |
1006 | controller = strndup(spec, e-spec); | |
1007 | if (!controller) | |
35d2e7ec | 1008 | return -ENOMEM; |
2a8020fe ZJS |
1009 | if (!cg_controller_is_valid(controller)) |
1010 | return -EINVAL; | |
35d2e7ec | 1011 | |
2a8020fe ZJS |
1012 | if (!isempty(e + 1)) { |
1013 | path = strdup(e+1); | |
1014 | if (!path) | |
1015 | return -ENOMEM; | |
35d2e7ec | 1016 | |
2a8020fe ZJS |
1017 | if (!path_is_normalized(path) || |
1018 | !path_is_absolute(path)) | |
1019 | return -EINVAL; | |
8c6db833 | 1020 | |
4ff361cc | 1021 | path_simplify(path); |
2a8020fe | 1022 | } |
246aa6dd | 1023 | |
2a8020fe ZJS |
1024 | } else { |
1025 | if (!cg_controller_is_valid(spec)) | |
1026 | return -EINVAL; | |
35d2e7ec | 1027 | |
2a8020fe ZJS |
1028 | if (ret_controller) { |
1029 | controller = strdup(spec); | |
1030 | if (!controller) | |
1031 | return -ENOMEM; | |
1032 | } | |
baa89da4 | 1033 | } |
baa89da4 | 1034 | } |
5954c074 | 1035 | |
2a8020fe ZJS |
1036 | if (ret_controller) |
1037 | *ret_controller = TAKE_PTR(controller); | |
1038 | if (ret_path) | |
1039 | *ret_path = TAKE_PTR(path); | |
35d2e7ec | 1040 | return 0; |
8c6db833 | 1041 | } |
c6c18be3 | 1042 | |
820fe745 | 1043 | int cg_mangle_path(const char *path, char **ret) { |
78edb35a | 1044 | _cleanup_free_ char *c = NULL, *p = NULL; |
35d2e7ec LP |
1045 | int r; |
1046 | ||
1047 | assert(path); | |
820fe745 | 1048 | assert(ret); |
35d2e7ec | 1049 | |
73e231ab | 1050 | /* First, check if it already is a filesystem path */ |
660087dc | 1051 | if (path_startswith(path, "/sys/fs/cgroup")) |
820fe745 | 1052 | return path_simplify_alloc(path, ret); |
35d2e7ec | 1053 | |
73e231ab | 1054 | /* Otherwise, treat it as cg spec */ |
b69d29ce LP |
1055 | r = cg_split_spec(path, &c, &p); |
1056 | if (r < 0) | |
35d2e7ec LP |
1057 | return r; |
1058 | ||
820fe745 | 1059 | return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, ret); |
35d2e7ec | 1060 | } |
1f73f0f1 | 1061 | |
820fe745 | 1062 | int cg_get_root_path(char **ret_path) { |
9444b1f2 | 1063 | char *p, *e; |
7027ff61 LP |
1064 | int r; |
1065 | ||
820fe745 | 1066 | assert(ret_path); |
7027ff61 | 1067 | |
9444b1f2 | 1068 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); |
7027ff61 LP |
1069 | if (r < 0) |
1070 | return r; | |
1071 | ||
efdb0237 LP |
1072 | e = endswith(p, "/" SPECIAL_INIT_SCOPE); |
1073 | if (!e) | |
1074 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */ | |
1075 | if (!e) | |
1076 | e = endswith(p, "/system"); /* even more legacy */ | |
9444b1f2 | 1077 | if (e) |
7027ff61 LP |
1078 | *e = 0; |
1079 | ||
820fe745 | 1080 | *ret_path = p; |
1f73f0f1 LP |
1081 | return 0; |
1082 | } | |
b59e2465 | 1083 | |
820fe745 | 1084 | int cg_shift_path(const char *cgroup, const char *root, const char **ret_shifted) { |
751bc6ac LP |
1085 | _cleanup_free_ char *rt = NULL; |
1086 | char *p; | |
ba1261bc LP |
1087 | int r; |
1088 | ||
e9174f29 | 1089 | assert(cgroup); |
820fe745 | 1090 | assert(ret_shifted); |
e9174f29 LP |
1091 | |
1092 | if (!root) { | |
1093 | /* If the root was specified let's use that, otherwise | |
1094 | * let's determine it from PID 1 */ | |
1095 | ||
751bc6ac | 1096 | r = cg_get_root_path(&rt); |
e9174f29 LP |
1097 | if (r < 0) |
1098 | return r; | |
1099 | ||
751bc6ac | 1100 | root = rt; |
e9174f29 | 1101 | } |
ba1261bc | 1102 | |
751bc6ac | 1103 | p = path_startswith(cgroup, root); |
efdb0237 | 1104 | if (p && p > cgroup) |
820fe745 | 1105 | *ret_shifted = p - 1; |
751bc6ac | 1106 | else |
820fe745 | 1107 | *ret_shifted = cgroup; |
751bc6ac LP |
1108 | |
1109 | return 0; | |
1110 | } | |
1111 | ||
820fe745 | 1112 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **ret_cgroup) { |
751bc6ac LP |
1113 | _cleanup_free_ char *raw = NULL; |
1114 | const char *c; | |
1115 | int r; | |
1116 | ||
1117 | assert(pid >= 0); | |
820fe745 | 1118 | assert(ret_cgroup); |
751bc6ac LP |
1119 | |
1120 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
7027ff61 | 1121 | if (r < 0) |
ba1261bc | 1122 | return r; |
ba1261bc | 1123 | |
751bc6ac LP |
1124 | r = cg_shift_path(raw, root, &c); |
1125 | if (r < 0) | |
1126 | return r; | |
ba1261bc | 1127 | |
ae2a15bc | 1128 | if (c == raw) |
820fe745 | 1129 | *ret_cgroup = TAKE_PTR(raw); |
ae2a15bc | 1130 | else { |
751bc6ac | 1131 | char *n; |
ba1261bc | 1132 | |
751bc6ac LP |
1133 | n = strdup(c); |
1134 | if (!n) | |
ba1261bc | 1135 | return -ENOMEM; |
ba1261bc | 1136 | |
820fe745 | 1137 | *ret_cgroup = n; |
751bc6ac | 1138 | } |
ba1261bc LP |
1139 | |
1140 | return 0; | |
1141 | } | |
1142 | ||
820fe745 | 1143 | int cg_path_decode_unit(const char *cgroup, char **ret_unit) { |
8b0849e9 LP |
1144 | char *c, *s; |
1145 | size_t n; | |
ef1673d1 MT |
1146 | |
1147 | assert(cgroup); | |
820fe745 | 1148 | assert(ret_unit); |
ef1673d1 | 1149 | |
8b0849e9 LP |
1150 | n = strcspn(cgroup, "/"); |
1151 | if (n < 3) | |
1152 | return -ENXIO; | |
1153 | ||
2f82562b | 1154 | c = strndupa_safe(cgroup, n); |
ae018d9b | 1155 | c = cg_unescape(c); |
ef1673d1 | 1156 | |
7410616c | 1157 | if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) |
cfeaa44a | 1158 | return -ENXIO; |
ef1673d1 | 1159 | |
d7bd3de0 | 1160 | s = strdup(c); |
6c03089c LP |
1161 | if (!s) |
1162 | return -ENOMEM; | |
1163 | ||
820fe745 | 1164 | *ret_unit = s; |
ef1673d1 MT |
1165 | return 0; |
1166 | } | |
1167 | ||
8b0849e9 LP |
1168 | static bool valid_slice_name(const char *p, size_t n) { |
1169 | ||
1170 | if (!p) | |
1171 | return false; | |
1172 | ||
fbd0b64f | 1173 | if (n < STRLEN("x.slice")) |
8b0849e9 LP |
1174 | return false; |
1175 | ||
1176 | if (memcmp(p + n - 6, ".slice", 6) == 0) { | |
1177 | char buf[n+1], *c; | |
1178 | ||
1179 | memcpy(buf, p, n); | |
1180 | buf[n] = 0; | |
1181 | ||
1182 | c = cg_unescape(buf); | |
1183 | ||
7410616c | 1184 | return unit_name_is_valid(c, UNIT_NAME_PLAIN); |
8b0849e9 LP |
1185 | } |
1186 | ||
1187 | return false; | |
1188 | } | |
1189 | ||
9444b1f2 | 1190 | static const char *skip_slices(const char *p) { |
8b0849e9 LP |
1191 | assert(p); |
1192 | ||
9444b1f2 LP |
1193 | /* Skips over all slice assignments */ |
1194 | ||
1195 | for (;;) { | |
1021b21b LP |
1196 | size_t n; |
1197 | ||
9444b1f2 LP |
1198 | p += strspn(p, "/"); |
1199 | ||
1200 | n = strcspn(p, "/"); | |
8b0849e9 | 1201 | if (!valid_slice_name(p, n)) |
9444b1f2 LP |
1202 | return p; |
1203 | ||
1204 | p += n; | |
1205 | } | |
1206 | } | |
1207 | ||
8b0849e9 | 1208 | int cg_path_get_unit(const char *path, char **ret) { |
fe96c0f8 | 1209 | _cleanup_free_ char *unit = NULL; |
6c03089c | 1210 | const char *e; |
8b0849e9 | 1211 | int r; |
6c03089c LP |
1212 | |
1213 | assert(path); | |
8b0849e9 | 1214 | assert(ret); |
6c03089c | 1215 | |
9444b1f2 | 1216 | e = skip_slices(path); |
6c03089c | 1217 | |
8b0849e9 LP |
1218 | r = cg_path_decode_unit(e, &unit); |
1219 | if (r < 0) | |
1220 | return r; | |
1221 | ||
1222 | /* We skipped over the slices, don't accept any now */ | |
fe96c0f8 | 1223 | if (endswith(unit, ".slice")) |
8b0849e9 | 1224 | return -ENXIO; |
8b0849e9 | 1225 | |
fe96c0f8 | 1226 | *ret = TAKE_PTR(unit); |
8b0849e9 | 1227 | return 0; |
6c03089c LP |
1228 | } |
1229 | ||
ee164216 QD |
1230 | int cg_path_get_unit_path(const char *path, char **ret) { |
1231 | _cleanup_free_ char *path_copy = NULL; | |
1232 | char *unit_name; | |
1233 | ||
1234 | assert(path); | |
1235 | assert(ret); | |
1236 | ||
1237 | path_copy = strdup(path); | |
1238 | if (!path_copy) | |
1239 | return -ENOMEM; | |
1240 | ||
1241 | unit_name = (char *)skip_slices(path_copy); | |
1242 | unit_name[strcspn(unit_name, "/")] = 0; | |
1243 | ||
1244 | if (!unit_name_is_valid(cg_unescape(unit_name), UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) | |
1245 | return -ENXIO; | |
1246 | ||
1247 | *ret = TAKE_PTR(path_copy); | |
1248 | ||
1249 | return 0; | |
1250 | } | |
1251 | ||
820fe745 | 1252 | int cg_pid_get_unit(pid_t pid, char **ret_unit) { |
7fd1b19b | 1253 | _cleanup_free_ char *cgroup = NULL; |
ba1261bc | 1254 | int r; |
ba1261bc | 1255 | |
820fe745 | 1256 | assert(ret_unit); |
ef1673d1 | 1257 | |
7027ff61 | 1258 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
ef1673d1 MT |
1259 | if (r < 0) |
1260 | return r; | |
1261 | ||
820fe745 | 1262 | return cg_path_get_unit(cgroup, ret_unit); |
6c03089c | 1263 | } |
ef1673d1 | 1264 | |
2c302e89 MY |
1265 | int cg_pidref_get_unit(const PidRef *pidref, char **ret) { |
1266 | _cleanup_free_ char *unit = NULL; | |
1267 | int r; | |
1268 | ||
1269 | assert(ret); | |
1270 | ||
1271 | if (!pidref_is_set(pidref)) | |
1272 | return -ESRCH; | |
1273 | ||
1274 | r = cg_pid_get_unit(pidref->pid, &unit); | |
1275 | if (r < 0) | |
1276 | return r; | |
1277 | ||
1278 | r = pidref_verify(pidref); | |
1279 | if (r < 0) | |
1280 | return r; | |
1281 | ||
1282 | *ret = TAKE_PTR(unit); | |
1283 | return 0; | |
1284 | } | |
1285 | ||
d4fffc4b ZJS |
1286 | /** |
1287 | * Skip session-*.scope, but require it to be there. | |
1288 | */ | |
9444b1f2 LP |
1289 | static const char *skip_session(const char *p) { |
1290 | size_t n; | |
1291 | ||
8b0849e9 LP |
1292 | if (isempty(p)) |
1293 | return NULL; | |
9444b1f2 LP |
1294 | |
1295 | p += strspn(p, "/"); | |
1296 | ||
1297 | n = strcspn(p, "/"); | |
fbd0b64f | 1298 | if (n < STRLEN("session-x.scope")) |
d4fffc4b ZJS |
1299 | return NULL; |
1300 | ||
8b0849e9 LP |
1301 | if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { |
1302 | char buf[n - 8 - 6 + 1]; | |
1303 | ||
1304 | memcpy(buf, p + 8, n - 8 - 6); | |
1305 | buf[n - 8 - 6] = 0; | |
d4fffc4b | 1306 | |
8b0849e9 LP |
1307 | /* Note that session scopes never need unescaping, |
1308 | * since they cannot conflict with the kernel's own | |
1309 | * names, hence we don't need to call cg_unescape() | |
1310 | * here. */ | |
1311 | ||
1312 | if (!session_id_valid(buf)) | |
db8e7209 | 1313 | return NULL; |
8b0849e9 LP |
1314 | |
1315 | p += n; | |
1316 | p += strspn(p, "/"); | |
1317 | return p; | |
1318 | } | |
1319 | ||
1320 | return NULL; | |
d4fffc4b ZJS |
1321 | } |
1322 | ||
1323 | /** | |
1324 | * Skip user@*.service, but require it to be there. | |
1325 | */ | |
1326 | static const char *skip_user_manager(const char *p) { | |
1327 | size_t n; | |
1328 | ||
8b0849e9 LP |
1329 | if (isempty(p)) |
1330 | return NULL; | |
d4fffc4b ZJS |
1331 | |
1332 | p += strspn(p, "/"); | |
1333 | ||
1334 | n = strcspn(p, "/"); | |
fbd0b64f | 1335 | if (n < STRLEN("user@x.service")) |
6c03089c | 1336 | return NULL; |
ef1673d1 | 1337 | |
8b0849e9 LP |
1338 | if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { |
1339 | char buf[n - 5 - 8 + 1]; | |
9444b1f2 | 1340 | |
8b0849e9 LP |
1341 | memcpy(buf, p + 5, n - 5 - 8); |
1342 | buf[n - 5 - 8] = 0; | |
1343 | ||
1344 | /* Note that user manager services never need unescaping, | |
1345 | * since they cannot conflict with the kernel's own | |
1346 | * names, hence we don't need to call cg_unescape() | |
1347 | * here. */ | |
1348 | ||
1349 | if (parse_uid(buf, NULL) < 0) | |
1350 | return NULL; | |
1351 | ||
1352 | p += n; | |
1353 | p += strspn(p, "/"); | |
1354 | ||
1355 | return p; | |
1356 | } | |
1357 | ||
1358 | return NULL; | |
9444b1f2 LP |
1359 | } |
1360 | ||
329ac4bc | 1361 | static const char *skip_user_prefix(const char *path) { |
d4fffc4b | 1362 | const char *e, *t; |
ef1673d1 | 1363 | |
6c03089c | 1364 | assert(path); |
ba1261bc | 1365 | |
9444b1f2 LP |
1366 | /* Skip slices, if there are any */ |
1367 | e = skip_slices(path); | |
ba1261bc | 1368 | |
329ac4bc | 1369 | /* Skip the user manager, if it's in the path now... */ |
8b0849e9 | 1370 | t = skip_user_manager(e); |
329ac4bc LP |
1371 | if (t) |
1372 | return t; | |
8b0849e9 | 1373 | |
329ac4bc LP |
1374 | /* Alternatively skip the user session if it is in the path... */ |
1375 | return skip_session(e); | |
1376 | } | |
32081481 | 1377 | |
329ac4bc LP |
1378 | int cg_path_get_user_unit(const char *path, char **ret) { |
1379 | const char *t; | |
6c03089c | 1380 | |
329ac4bc LP |
1381 | assert(path); |
1382 | assert(ret); | |
8b0849e9 | 1383 | |
329ac4bc LP |
1384 | t = skip_user_prefix(path); |
1385 | if (!t) | |
8b0849e9 | 1386 | return -ENXIO; |
8b0849e9 | 1387 | |
bf21be10 LP |
1388 | /* And from here on it looks pretty much the same as for a system unit, hence let's use the same |
1389 | * parser. */ | |
329ac4bc | 1390 | return cg_path_get_unit(t, ret); |
ef1673d1 | 1391 | } |
ba1261bc | 1392 | |
820fe745 | 1393 | int cg_pid_get_user_unit(pid_t pid, char **ret_unit) { |
7fd1b19b | 1394 | _cleanup_free_ char *cgroup = NULL; |
6c03089c LP |
1395 | int r; |
1396 | ||
820fe745 | 1397 | assert(ret_unit); |
6c03089c | 1398 | |
7027ff61 | 1399 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
6c03089c LP |
1400 | if (r < 0) |
1401 | return r; | |
1402 | ||
820fe745 | 1403 | return cg_path_get_user_unit(cgroup, ret_unit); |
ba1261bc | 1404 | } |
e884315e | 1405 | |
820fe745 | 1406 | int cg_path_get_machine_name(const char *path, char **ret_machine) { |
efdb0237 LP |
1407 | _cleanup_free_ char *u = NULL; |
1408 | const char *sl; | |
89f7c846 | 1409 | int r; |
374ec6ab | 1410 | |
89f7c846 LP |
1411 | r = cg_path_get_unit(path, &u); |
1412 | if (r < 0) | |
1413 | return r; | |
7027ff61 | 1414 | |
efdb0237 | 1415 | sl = strjoina("/run/systemd/machines/unit:", u); |
820fe745 | 1416 | return readlink_malloc(sl, ret_machine); |
7027ff61 LP |
1417 | } |
1418 | ||
820fe745 | 1419 | int cg_pid_get_machine_name(pid_t pid, char **ret_machine) { |
7fd1b19b | 1420 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1421 | int r; |
1422 | ||
820fe745 | 1423 | assert(ret_machine); |
7027ff61 LP |
1424 | |
1425 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1426 | if (r < 0) | |
1427 | return r; | |
1428 | ||
820fe745 | 1429 | return cg_path_get_machine_name(cgroup, ret_machine); |
7027ff61 LP |
1430 | } |
1431 | ||
535e3dd0 | 1432 | int cg_path_get_cgroupid(const char *path, uint64_t *ret) { |
a5edf95e | 1433 | cg_file_handle fh = CG_FILE_HANDLE_INIT; |
535e3dd0 ILG |
1434 | int mnt_id = -1; |
1435 | ||
1436 | assert(path); | |
1437 | assert(ret); | |
1438 | ||
535e3dd0 ILG |
1439 | /* This is cgroupfs so we know the size of the handle, thus no need to loop around like |
1440 | * name_to_handle_at_loop() does in mountpoint-util.c */ | |
a5edf95e | 1441 | if (name_to_handle_at(AT_FDCWD, path, &fh.file_handle, &mnt_id, 0) < 0) |
535e3dd0 ILG |
1442 | return -errno; |
1443 | ||
a5edf95e | 1444 | *ret = CG_FILE_HANDLE_CGROUPID(fh); |
535e3dd0 ILG |
1445 | return 0; |
1446 | } | |
1447 | ||
820fe745 | 1448 | int cg_path_get_session(const char *path, char **ret_session) { |
8b0849e9 LP |
1449 | _cleanup_free_ char *unit = NULL; |
1450 | char *start, *end; | |
1451 | int r; | |
7027ff61 LP |
1452 | |
1453 | assert(path); | |
7027ff61 | 1454 | |
8b0849e9 LP |
1455 | r = cg_path_get_unit(path, &unit); |
1456 | if (r < 0) | |
1457 | return r; | |
7027ff61 | 1458 | |
8b0849e9 LP |
1459 | start = startswith(unit, "session-"); |
1460 | if (!start) | |
cfeaa44a | 1461 | return -ENXIO; |
8b0849e9 LP |
1462 | end = endswith(start, ".scope"); |
1463 | if (!end) | |
cfeaa44a | 1464 | return -ENXIO; |
8b0849e9 LP |
1465 | |
1466 | *end = 0; | |
1467 | if (!session_id_valid(start)) | |
cfeaa44a | 1468 | return -ENXIO; |
374ec6ab | 1469 | |
820fe745 | 1470 | if (ret_session) { |
8b0849e9 | 1471 | char *rr; |
af08d2f9 | 1472 | |
8b0849e9 LP |
1473 | rr = strdup(start); |
1474 | if (!rr) | |
af08d2f9 LP |
1475 | return -ENOMEM; |
1476 | ||
820fe745 | 1477 | *ret_session = rr; |
af08d2f9 | 1478 | } |
7027ff61 | 1479 | |
7027ff61 LP |
1480 | return 0; |
1481 | } | |
1482 | ||
820fe745 | 1483 | int cg_pid_get_session(pid_t pid, char **ret_session) { |
7fd1b19b | 1484 | _cleanup_free_ char *cgroup = NULL; |
7027ff61 LP |
1485 | int r; |
1486 | ||
7027ff61 LP |
1487 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1488 | if (r < 0) | |
1489 | return r; | |
1490 | ||
820fe745 | 1491 | return cg_path_get_session(cgroup, ret_session); |
7027ff61 LP |
1492 | } |
1493 | ||
820fe745 | 1494 | int cg_path_get_owner_uid(const char *path, uid_t *ret_uid) { |
374ec6ab | 1495 | _cleanup_free_ char *slice = NULL; |
8b0849e9 | 1496 | char *start, *end; |
374ec6ab | 1497 | int r; |
ae018d9b LP |
1498 | |
1499 | assert(path); | |
ae018d9b | 1500 | |
374ec6ab LP |
1501 | r = cg_path_get_slice(path, &slice); |
1502 | if (r < 0) | |
1503 | return r; | |
ae018d9b | 1504 | |
674eb685 LP |
1505 | start = startswith(slice, "user-"); |
1506 | if (!start) | |
cfeaa44a | 1507 | return -ENXIO; |
820fe745 | 1508 | |
8b0849e9 | 1509 | end = endswith(start, ".slice"); |
674eb685 | 1510 | if (!end) |
cfeaa44a | 1511 | return -ENXIO; |
ae018d9b | 1512 | |
8b0849e9 | 1513 | *end = 0; |
820fe745 | 1514 | if (parse_uid(start, ret_uid) < 0) |
cfeaa44a | 1515 | return -ENXIO; |
674eb685 | 1516 | |
674eb685 | 1517 | return 0; |
ae018d9b LP |
1518 | } |
1519 | ||
820fe745 | 1520 | int cg_pid_get_owner_uid(pid_t pid, uid_t *ret_uid) { |
ae018d9b LP |
1521 | _cleanup_free_ char *cgroup = NULL; |
1522 | int r; | |
1523 | ||
ae018d9b LP |
1524 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); |
1525 | if (r < 0) | |
1526 | return r; | |
1527 | ||
820fe745 | 1528 | return cg_path_get_owner_uid(cgroup, ret_uid); |
ae018d9b LP |
1529 | } |
1530 | ||
820fe745 | 1531 | int cg_path_get_slice(const char *p, char **ret_slice) { |
1021b21b | 1532 | const char *e = NULL; |
1021b21b LP |
1533 | |
1534 | assert(p); | |
820fe745 | 1535 | assert(ret_slice); |
1021b21b | 1536 | |
329ac4bc LP |
1537 | /* Finds the right-most slice unit from the beginning, but |
1538 | * stops before we come to the first non-slice unit. */ | |
1539 | ||
1021b21b LP |
1540 | for (;;) { |
1541 | size_t n; | |
1542 | ||
1543 | p += strspn(p, "/"); | |
1544 | ||
1545 | n = strcspn(p, "/"); | |
8b0849e9 | 1546 | if (!valid_slice_name(p, n)) { |
1021b21b | 1547 | |
8b0849e9 LP |
1548 | if (!e) { |
1549 | char *s; | |
1021b21b | 1550 | |
e5d855d3 | 1551 | s = strdup(SPECIAL_ROOT_SLICE); |
8b0849e9 LP |
1552 | if (!s) |
1553 | return -ENOMEM; | |
1021b21b | 1554 | |
820fe745 | 1555 | *ret_slice = s; |
8b0849e9 LP |
1556 | return 0; |
1557 | } | |
1558 | ||
820fe745 | 1559 | return cg_path_decode_unit(e, ret_slice); |
1021b21b LP |
1560 | } |
1561 | ||
1562 | e = p; | |
1021b21b LP |
1563 | p += n; |
1564 | } | |
1565 | } | |
1566 | ||
820fe745 | 1567 | int cg_pid_get_slice(pid_t pid, char **ret_slice) { |
1021b21b LP |
1568 | _cleanup_free_ char *cgroup = NULL; |
1569 | int r; | |
1570 | ||
820fe745 | 1571 | assert(ret_slice); |
1021b21b LP |
1572 | |
1573 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1574 | if (r < 0) | |
1575 | return r; | |
1576 | ||
820fe745 | 1577 | return cg_path_get_slice(cgroup, ret_slice); |
1021b21b LP |
1578 | } |
1579 | ||
820fe745 | 1580 | int cg_path_get_user_slice(const char *p, char **ret_slice) { |
329ac4bc LP |
1581 | const char *t; |
1582 | assert(p); | |
820fe745 | 1583 | assert(ret_slice); |
329ac4bc LP |
1584 | |
1585 | t = skip_user_prefix(p); | |
1586 | if (!t) | |
1587 | return -ENXIO; | |
1588 | ||
820fe745 LP |
1589 | /* And now it looks pretty much the same as for a system slice, so let's just use the same parser |
1590 | * from here on. */ | |
1591 | return cg_path_get_slice(t, ret_slice); | |
329ac4bc LP |
1592 | } |
1593 | ||
820fe745 | 1594 | int cg_pid_get_user_slice(pid_t pid, char **ret_slice) { |
329ac4bc LP |
1595 | _cleanup_free_ char *cgroup = NULL; |
1596 | int r; | |
1597 | ||
820fe745 | 1598 | assert(ret_slice); |
329ac4bc LP |
1599 | |
1600 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1601 | if (r < 0) | |
1602 | return r; | |
1603 | ||
820fe745 | 1604 | return cg_path_get_user_slice(cgroup, ret_slice); |
329ac4bc LP |
1605 | } |
1606 | ||
1a56b0c0 | 1607 | bool cg_needs_escape(const char *p) { |
ae018d9b | 1608 | |
1a56b0c0 LP |
1609 | /* Checks if the specified path is a valid cgroup name by our rules, or if it must be escaped. Note |
1610 | * that we consider escaped cgroup names invalid here, as they need to be escaped a second time if | |
1611 | * they shall be used. Also note that various names cannot be made valid by escaping even if we | |
1612 | * return true here (because too long, or contain the forbidden character "/"). */ | |
ae018d9b | 1613 | |
1a56b0c0 LP |
1614 | if (!filename_is_valid(p)) |
1615 | return true; | |
efdb0237 | 1616 | |
1a56b0c0 LP |
1617 | if (IN_SET(p[0], '_', '.')) |
1618 | return true; | |
ae018d9b | 1619 | |
1a56b0c0 LP |
1620 | if (STR_IN_SET(p, "notify_on_release", "release_agent", "tasks")) |
1621 | return true; | |
ae018d9b | 1622 | |
1a56b0c0 LP |
1623 | if (startswith(p, "cgroup.")) |
1624 | return true; | |
efdb0237 | 1625 | |
1a56b0c0 LP |
1626 | for (CGroupController c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
1627 | const char *q; | |
1628 | ||
1629 | q = startswith(p, cgroup_controller_to_string(c)); | |
1630 | if (!q) | |
1631 | continue; | |
1632 | ||
1633 | if (q[0] == '.') | |
1634 | return true; | |
ae018d9b LP |
1635 | } |
1636 | ||
1a56b0c0 LP |
1637 | return false; |
1638 | } | |
efdb0237 | 1639 | |
1a56b0c0 LP |
1640 | int cg_escape(const char *p, char **ret) { |
1641 | _cleanup_free_ char *n = NULL; | |
1642 | ||
1643 | /* This implements very minimal escaping for names to be used as file names in the cgroup tree: any | |
1644 | * name which might conflict with a kernel name or is prefixed with '_' is prefixed with a '_'. That | |
1645 | * way, when reading cgroup names it is sufficient to remove a single prefixing underscore if there | |
1646 | * is one. */ | |
1647 | ||
1648 | /* The return value of this function (unlike cg_unescape()) needs free()! */ | |
1649 | ||
1650 | if (cg_needs_escape(p)) { | |
1651 | n = strjoin("_", p); | |
1652 | if (!n) | |
1653 | return -ENOMEM; | |
1654 | ||
1655 | if (!filename_is_valid(n)) /* became invalid due to the prefixing? Or contained things like a slash that cannot be fixed by prefixing? */ | |
1656 | return -EINVAL; | |
1657 | } else { | |
1658 | n = strdup(p); | |
1659 | if (!n) | |
1660 | return -ENOMEM; | |
1661 | } | |
1662 | ||
1663 | *ret = TAKE_PTR(n); | |
1664 | return 0; | |
ae018d9b LP |
1665 | } |
1666 | ||
1667 | char *cg_unescape(const char *p) { | |
1668 | assert(p); | |
1669 | ||
1670 | /* The return value of this function (unlike cg_escape()) | |
1671 | * doesn't need free()! */ | |
1672 | ||
1673 | if (p[0] == '_') | |
1674 | return (char*) p+1; | |
1675 | ||
1676 | return (char*) p; | |
1677 | } | |
78edb35a LP |
1678 | |
1679 | #define CONTROLLER_VALID \ | |
4b549144 | 1680 | DIGITS LETTERS \ |
78edb35a LP |
1681 | "_" |
1682 | ||
185a0874 | 1683 | bool cg_controller_is_valid(const char *p) { |
78edb35a LP |
1684 | const char *t, *s; |
1685 | ||
1686 | if (!p) | |
1687 | return false; | |
1688 | ||
b6629c4b TH |
1689 | if (streq(p, SYSTEMD_CGROUP_CONTROLLER)) |
1690 | return true; | |
1691 | ||
185a0874 DJL |
1692 | s = startswith(p, "name="); |
1693 | if (s) | |
1694 | p = s; | |
78edb35a | 1695 | |
4c701096 | 1696 | if (IN_SET(*p, 0, '_')) |
78edb35a LP |
1697 | return false; |
1698 | ||
1699 | for (t = p; *t; t++) | |
1700 | if (!strchr(CONTROLLER_VALID, *t)) | |
1701 | return false; | |
1702 | ||
8ca94009 | 1703 | if (t - p > NAME_MAX) |
78edb35a LP |
1704 | return false; |
1705 | ||
1706 | return true; | |
1707 | } | |
a016b922 LP |
1708 | |
1709 | int cg_slice_to_path(const char *unit, char **ret) { | |
1710 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1711 | const char *dash; | |
7410616c | 1712 | int r; |
a016b922 LP |
1713 | |
1714 | assert(unit); | |
1715 | assert(ret); | |
1716 | ||
e5d855d3 | 1717 | if (streq(unit, SPECIAL_ROOT_SLICE)) { |
c96cc582 LP |
1718 | char *x; |
1719 | ||
1720 | x = strdup(""); | |
1721 | if (!x) | |
1722 | return -ENOMEM; | |
1723 | *ret = x; | |
1724 | return 0; | |
1725 | } | |
1726 | ||
7410616c | 1727 | if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) |
a016b922 LP |
1728 | return -EINVAL; |
1729 | ||
1730 | if (!endswith(unit, ".slice")) | |
1731 | return -EINVAL; | |
1732 | ||
7410616c LP |
1733 | r = unit_name_to_prefix(unit, &p); |
1734 | if (r < 0) | |
1735 | return r; | |
a016b922 LP |
1736 | |
1737 | dash = strchr(p, '-'); | |
e66e5b61 LP |
1738 | |
1739 | /* Don't allow initial dashes */ | |
1740 | if (dash == p) | |
1741 | return -EINVAL; | |
1742 | ||
a016b922 LP |
1743 | while (dash) { |
1744 | _cleanup_free_ char *escaped = NULL; | |
1745 | char n[dash - p + sizeof(".slice")]; | |
1746 | ||
989290db | 1747 | #if HAS_FEATURE_MEMORY_SANITIZER |
1c56d501 | 1748 | /* msan doesn't instrument stpncpy, so it thinks |
5238e957 | 1749 | * n is later used uninitialized: |
1c56d501 ZJS |
1750 | * https://github.com/google/sanitizers/issues/926 |
1751 | */ | |
1752 | zero(n); | |
1753 | #endif | |
1754 | ||
e66e5b61 | 1755 | /* Don't allow trailing or double dashes */ |
4c701096 | 1756 | if (IN_SET(dash[1], 0, '-')) |
c96cc582 | 1757 | return -EINVAL; |
a016b922 | 1758 | |
c96cc582 | 1759 | strcpy(stpncpy(n, p, dash - p), ".slice"); |
7410616c | 1760 | if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) |
a016b922 LP |
1761 | return -EINVAL; |
1762 | ||
1a56b0c0 LP |
1763 | r = cg_escape(n, &escaped); |
1764 | if (r < 0) | |
1765 | return r; | |
a016b922 | 1766 | |
c2bc710b | 1767 | if (!strextend(&s, escaped, "/")) |
a016b922 LP |
1768 | return -ENOMEM; |
1769 | ||
1770 | dash = strchr(dash+1, '-'); | |
1771 | } | |
1772 | ||
1a56b0c0 LP |
1773 | r = cg_escape(unit, &e); |
1774 | if (r < 0) | |
1775 | return r; | |
a016b922 | 1776 | |
c2bc710b | 1777 | if (!strextend(&s, e)) |
a016b922 LP |
1778 | return -ENOMEM; |
1779 | ||
ae2a15bc | 1780 | *ret = TAKE_PTR(s); |
a016b922 LP |
1781 | return 0; |
1782 | } | |
4ad49000 | 1783 | |
bd1791b5 | 1784 | int cg_is_threaded(const char *path) { |
084e7706 YW |
1785 | _cleanup_free_ char *fs = NULL, *contents = NULL; |
1786 | _cleanup_strv_free_ char **v = NULL; | |
1787 | int r; | |
1788 | ||
bd1791b5 | 1789 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, "cgroup.type", &fs); |
084e7706 YW |
1790 | if (r < 0) |
1791 | return r; | |
1792 | ||
1793 | r = read_full_virtual_file(fs, &contents, NULL); | |
1794 | if (r == -ENOENT) | |
1795 | return false; /* Assume no. */ | |
1796 | if (r < 0) | |
1797 | return r; | |
1798 | ||
1799 | v = strv_split(contents, NULL); | |
1800 | if (!v) | |
1801 | return -ENOMEM; | |
1802 | ||
1803 | /* If the cgroup is in the threaded mode, it contains "threaded". | |
1804 | * If one of the parents or siblings is in the threaded mode, it may contain "invalid". */ | |
1805 | return strv_contains(v, "threaded") || strv_contains(v, "invalid"); | |
1806 | } | |
1807 | ||
4ad49000 LP |
1808 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { |
1809 | _cleanup_free_ char *p = NULL; | |
1810 | int r; | |
1811 | ||
1812 | r = cg_get_path(controller, path, attribute, &p); | |
1813 | if (r < 0) | |
1814 | return r; | |
1815 | ||
604028de | 1816 | return write_string_file(p, value, WRITE_STRING_FILE_DISABLE_BUFFER); |
4ad49000 LP |
1817 | } |
1818 | ||
934277fe LP |
1819 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { |
1820 | _cleanup_free_ char *p = NULL; | |
1821 | int r; | |
1822 | ||
1823 | r = cg_get_path(controller, path, attribute, &p); | |
1824 | if (r < 0) | |
1825 | return r; | |
1826 | ||
1827 | return read_one_line_file(p, ret); | |
1828 | } | |
1829 | ||
613328c3 AZ |
1830 | int cg_get_attribute_as_uint64(const char *controller, const char *path, const char *attribute, uint64_t *ret) { |
1831 | _cleanup_free_ char *value = NULL; | |
1832 | uint64_t v; | |
1833 | int r; | |
1834 | ||
1835 | assert(ret); | |
1836 | ||
1837 | r = cg_get_attribute(controller, path, attribute, &value); | |
1838 | if (r == -ENOENT) | |
1839 | return -ENODATA; | |
1840 | if (r < 0) | |
1841 | return r; | |
1842 | ||
1843 | if (streq(value, "max")) { | |
1844 | *ret = CGROUP_LIMIT_MAX; | |
1845 | return 0; | |
1846 | } | |
1847 | ||
1848 | r = safe_atou64(value, &v); | |
1849 | if (r < 0) | |
1850 | return r; | |
1851 | ||
1852 | *ret = v; | |
1853 | return 0; | |
1854 | } | |
1855 | ||
b41dcc51 AZ |
1856 | int cg_get_attribute_as_bool(const char *controller, const char *path, const char *attribute, bool *ret) { |
1857 | _cleanup_free_ char *value = NULL; | |
1858 | int r; | |
1859 | ||
1860 | assert(ret); | |
1861 | ||
1862 | r = cg_get_attribute(controller, path, attribute, &value); | |
1863 | if (r == -ENOENT) | |
1864 | return -ENODATA; | |
1865 | if (r < 0) | |
1866 | return r; | |
1867 | ||
1868 | r = parse_boolean(value); | |
1869 | if (r < 0) | |
1870 | return r; | |
1871 | ||
1872 | *ret = r; | |
1873 | return 0; | |
1874 | } | |
1875 | ||
bd1791b5 | 1876 | int cg_get_owner(const char *path, uid_t *ret_uid) { |
59331b8e AZ |
1877 | _cleanup_free_ char *f = NULL; |
1878 | struct stat stats; | |
1879 | int r; | |
1880 | ||
1881 | assert(ret_uid); | |
1882 | ||
bd1791b5 | 1883 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &f); |
59331b8e AZ |
1884 | if (r < 0) |
1885 | return r; | |
1886 | ||
b30da1c6 | 1887 | if (stat(f, &stats) < 0) |
59331b8e AZ |
1888 | return -errno; |
1889 | ||
b30da1c6 LP |
1890 | r = stat_verify_directory(&stats); |
1891 | if (r < 0) | |
1892 | return r; | |
1893 | ||
59331b8e AZ |
1894 | *ret_uid = stats.st_uid; |
1895 | return 0; | |
1896 | } | |
1897 | ||
25a1f04c | 1898 | int cg_get_keyed_attribute_full( |
b734a4ff LP |
1899 | const char *controller, |
1900 | const char *path, | |
1901 | const char *attribute, | |
1902 | char **keys, | |
25a1f04c MS |
1903 | char **ret_values, |
1904 | CGroupKeyMode mode) { | |
66ebf6c0 | 1905 | |
b734a4ff | 1906 | _cleanup_free_ char *filename = NULL, *contents = NULL; |
b734a4ff | 1907 | const char *p; |
9177fa9f | 1908 | size_t n, i, n_done = 0; |
b734a4ff LP |
1909 | char **v; |
1910 | int r; | |
1911 | ||
4e1dfa45 | 1912 | /* Reads one or more fields of a cgroup v2 keyed attribute file. The 'keys' parameter should be an strv with |
b734a4ff LP |
1913 | * all keys to retrieve. The 'ret_values' parameter should be passed as string size with the same number of |
1914 | * entries as 'keys'. On success each entry will be set to the value of the matching key. | |
1915 | * | |
d9e45bc3 MS |
1916 | * If the attribute file doesn't exist at all returns ENOENT, if any key is not found returns ENXIO. If mode |
1917 | * is set to GG_KEY_MODE_GRACEFUL we ignore missing keys and return those that were parsed successfully. */ | |
66ebf6c0 TH |
1918 | |
1919 | r = cg_get_path(controller, path, attribute, &filename); | |
1920 | if (r < 0) | |
1921 | return r; | |
1922 | ||
b734a4ff | 1923 | r = read_full_file(filename, &contents, NULL); |
66ebf6c0 TH |
1924 | if (r < 0) |
1925 | return r; | |
1926 | ||
b734a4ff LP |
1927 | n = strv_length(keys); |
1928 | if (n == 0) /* No keys to retrieve? That's easy, we are done then */ | |
1929 | return 0; | |
66ebf6c0 | 1930 | |
b734a4ff LP |
1931 | /* Let's build this up in a temporary array for now in order not to clobber the return parameter on failure */ |
1932 | v = newa0(char*, n); | |
66ebf6c0 | 1933 | |
b734a4ff LP |
1934 | for (p = contents; *p;) { |
1935 | const char *w = NULL; | |
b734a4ff | 1936 | |
9177fa9f ZJS |
1937 | for (i = 0; i < n; i++) |
1938 | if (!v[i]) { | |
b734a4ff LP |
1939 | w = first_word(p, keys[i]); |
1940 | if (w) | |
1941 | break; | |
66ebf6c0 | 1942 | } |
66ebf6c0 | 1943 | |
b734a4ff | 1944 | if (w) { |
b734a4ff LP |
1945 | size_t l; |
1946 | ||
1947 | l = strcspn(w, NEWLINE); | |
9177fa9f ZJS |
1948 | v[i] = strndup(w, l); |
1949 | if (!v[i]) { | |
b734a4ff LP |
1950 | r = -ENOMEM; |
1951 | goto fail; | |
66ebf6c0 | 1952 | } |
b734a4ff | 1953 | |
b734a4ff | 1954 | n_done++; |
b734a4ff LP |
1955 | if (n_done >= n) |
1956 | goto done; | |
1957 | ||
1958 | p = w + l; | |
9177fa9f | 1959 | } else |
b734a4ff | 1960 | p += strcspn(p, NEWLINE); |
b734a4ff LP |
1961 | |
1962 | p += strspn(p, NEWLINE); | |
66ebf6c0 TH |
1963 | } |
1964 | ||
25a1f04c MS |
1965 | if (mode & CG_KEY_MODE_GRACEFUL) |
1966 | goto done; | |
d9e45bc3 MS |
1967 | |
1968 | r = -ENXIO; | |
b734a4ff LP |
1969 | |
1970 | fail: | |
24ae45cb | 1971 | free_many_charp(v, n); |
b734a4ff LP |
1972 | return r; |
1973 | ||
1974 | done: | |
1975 | memcpy(ret_values, v, sizeof(char*) * n); | |
25a1f04c MS |
1976 | if (mode & CG_KEY_MODE_GRACEFUL) |
1977 | return n_done; | |
1978 | ||
66ebf6c0 | 1979 | return 0; |
4ad49000 LP |
1980 | } |
1981 | ||
aae7e17f | 1982 | int cg_mask_to_string(CGroupMask mask, char **ret) { |
ec635a2d | 1983 | _cleanup_free_ char *s = NULL; |
ec635a2d | 1984 | bool space = false; |
aae7e17f | 1985 | CGroupController c; |
319a4f4b | 1986 | size_t n = 0; |
aae7e17f FB |
1987 | |
1988 | assert(ret); | |
1989 | ||
1990 | if (mask == 0) { | |
1991 | *ret = NULL; | |
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
ec635a2d LP |
1996 | const char *k; |
1997 | size_t l; | |
aae7e17f | 1998 | |
f99850a0 | 1999 | if (!FLAGS_SET(mask, CGROUP_CONTROLLER_TO_MASK(c))) |
aae7e17f FB |
2000 | continue; |
2001 | ||
ec635a2d LP |
2002 | k = cgroup_controller_to_string(c); |
2003 | l = strlen(k); | |
2004 | ||
319a4f4b | 2005 | if (!GREEDY_REALLOC(s, n + space + l + 1)) |
ec635a2d LP |
2006 | return -ENOMEM; |
2007 | ||
2008 | if (space) | |
2009 | s[n] = ' '; | |
2010 | memcpy(s + n + space, k, l); | |
2011 | n += space + l; | |
2012 | ||
2013 | space = true; | |
aae7e17f FB |
2014 | } |
2015 | ||
ec635a2d | 2016 | assert(s); |
aae7e17f | 2017 | |
ec635a2d | 2018 | s[n] = 0; |
ae2a15bc | 2019 | *ret = TAKE_PTR(s); |
ec635a2d | 2020 | |
aae7e17f FB |
2021 | return 0; |
2022 | } | |
2023 | ||
38a90d45 LP |
2024 | int cg_mask_from_string(const char *value, CGroupMask *ret) { |
2025 | CGroupMask m = 0; | |
2026 | ||
2027 | assert(ret); | |
aae7e17f FB |
2028 | assert(value); |
2029 | ||
2030 | for (;;) { | |
2031 | _cleanup_free_ char *n = NULL; | |
2032 | CGroupController v; | |
2033 | int r; | |
2034 | ||
2035 | r = extract_first_word(&value, &n, NULL, 0); | |
2036 | if (r < 0) | |
2037 | return r; | |
2038 | if (r == 0) | |
2039 | break; | |
2040 | ||
2041 | v = cgroup_controller_from_string(n); | |
2042 | if (v < 0) | |
2043 | continue; | |
2044 | ||
38a90d45 | 2045 | m |= CGROUP_CONTROLLER_TO_MASK(v); |
aae7e17f | 2046 | } |
38a90d45 LP |
2047 | |
2048 | *ret = m; | |
aae7e17f FB |
2049 | return 0; |
2050 | } | |
2051 | ||
0fa7b500 | 2052 | int cg_mask_supported_subtree(const char *root, CGroupMask *ret) { |
38a90d45 | 2053 | CGroupMask mask; |
415fc41c | 2054 | int r; |
efdb0237 | 2055 | |
67558d15 LP |
2056 | /* Determines the mask of supported cgroup controllers. Only includes controllers we can make sense of and that |
2057 | * are actually accessible. Only covers real controllers, i.e. not the CGROUP_CONTROLLER_BPF_xyz | |
2058 | * pseudo-controllers. */ | |
4ad49000 | 2059 | |
b4cccbc1 LP |
2060 | r = cg_all_unified(); |
2061 | if (r < 0) | |
2062 | return r; | |
2063 | if (r > 0) { | |
0fa7b500 | 2064 | _cleanup_free_ char *controllers = NULL, *path = NULL; |
efdb0237 | 2065 | |
d51c4fca YW |
2066 | /* In the unified hierarchy we can read the supported and accessible controllers from |
2067 | * the top-level cgroup attribute */ | |
efdb0237 | 2068 | |
5f4c5fef LP |
2069 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path); |
2070 | if (r < 0) | |
2071 | return r; | |
2072 | ||
2073 | r = read_one_line_file(path, &controllers); | |
efdb0237 LP |
2074 | if (r < 0) |
2075 | return r; | |
4ad49000 | 2076 | |
aae7e17f FB |
2077 | r = cg_mask_from_string(controllers, &mask); |
2078 | if (r < 0) | |
2079 | return r; | |
efdb0237 | 2080 | |
1fbbb526 | 2081 | /* Mask controllers that are not supported in unified hierarchy. */ |
03afd780 | 2082 | mask &= CGROUP_MASK_V2; |
efdb0237 LP |
2083 | |
2084 | } else { | |
2085 | CGroupController c; | |
2086 | ||
0fa7b500 | 2087 | /* In the legacy hierarchy, we check which hierarchies are accessible. */ |
efdb0237 | 2088 | |
38a90d45 | 2089 | mask = 0; |
efdb0237 | 2090 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { |
03afd780 | 2091 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); |
efdb0237 LP |
2092 | const char *n; |
2093 | ||
03afd780 LP |
2094 | if (!FLAGS_SET(CGROUP_MASK_V1, bit)) |
2095 | continue; | |
2096 | ||
efdb0237 | 2097 | n = cgroup_controller_to_string(c); |
0fa7b500 | 2098 | if (controller_is_v1_accessible(root, n) >= 0) |
03afd780 | 2099 | mask |= bit; |
efdb0237 | 2100 | } |
4ad49000 LP |
2101 | } |
2102 | ||
efdb0237 LP |
2103 | *ret = mask; |
2104 | return 0; | |
4ad49000 | 2105 | } |
b12afc8c | 2106 | |
0fa7b500 MK |
2107 | int cg_mask_supported(CGroupMask *ret) { |
2108 | _cleanup_free_ char *root = NULL; | |
2109 | int r; | |
2110 | ||
2111 | r = cg_get_root_path(&root); | |
2112 | if (r < 0) | |
2113 | return r; | |
2114 | ||
2115 | return cg_mask_supported_subtree(root, ret); | |
2116 | } | |
2117 | ||
6925a0de | 2118 | int cg_kernel_controllers(Set **ret) { |
594c3835 | 2119 | _cleanup_set_free_ Set *controllers = NULL; |
b12afc8c | 2120 | _cleanup_fclose_ FILE *f = NULL; |
b12afc8c LP |
2121 | int r; |
2122 | ||
6925a0de | 2123 | assert(ret); |
b12afc8c | 2124 | |
f09e86bc LS |
2125 | /* Determines the full list of kernel-known controllers. Might include controllers we don't actually support |
2126 | * and controllers that aren't currently accessible (because not mounted). This does not include "name=" | |
2127 | * pseudo-controllers. */ | |
e155a0aa | 2128 | |
fdeea3f4 ZJS |
2129 | r = fopen_unlocked("/proc/cgroups", "re", &f); |
2130 | if (r == -ENOENT) { | |
2131 | *ret = NULL; | |
2132 | return 0; | |
b12afc8c | 2133 | } |
fdeea3f4 ZJS |
2134 | if (r < 0) |
2135 | return r; | |
35bbbf85 | 2136 | |
b12afc8c | 2137 | /* Ignore the header line */ |
f5fbe71d | 2138 | (void) read_line(f, SIZE_MAX, NULL); |
b12afc8c LP |
2139 | |
2140 | for (;;) { | |
dccdbf9b | 2141 | _cleanup_free_ char *controller = NULL; |
b12afc8c LP |
2142 | int enabled = 0; |
2143 | ||
b12afc8c LP |
2144 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { |
2145 | ||
121b7054 MY |
2146 | if (ferror(f)) |
2147 | return -errno; | |
2148 | ||
b12afc8c LP |
2149 | if (feof(f)) |
2150 | break; | |
2151 | ||
b12afc8c LP |
2152 | return -EBADMSG; |
2153 | } | |
2154 | ||
dccdbf9b | 2155 | if (!enabled) |
b12afc8c | 2156 | continue; |
b12afc8c | 2157 | |
dccdbf9b | 2158 | if (!cg_controller_is_valid(controller)) |
b12afc8c | 2159 | return -EBADMSG; |
b12afc8c | 2160 | |
594c3835 | 2161 | r = set_ensure_consume(&controllers, &string_hash_ops_free, TAKE_PTR(controller)); |
b12afc8c LP |
2162 | if (r < 0) |
2163 | return r; | |
2164 | } | |
2165 | ||
1cc6c93a | 2166 | *ret = TAKE_PTR(controllers); |
6925a0de | 2167 | |
b12afc8c LP |
2168 | return 0; |
2169 | } | |
efdb0237 | 2170 | |
d4d99bc6 ZJS |
2171 | /* The hybrid mode was initially implemented in v232 and simply mounted cgroup2 on |
2172 | * /sys/fs/cgroup/systemd. This unfortunately broke other tools (such as docker) which expected the v1 | |
2173 | * "name=systemd" hierarchy on /sys/fs/cgroup/systemd. From v233 and on, the hybrid mode mounts v2 on | |
2174 | * /sys/fs/cgroup/unified and maintains "name=systemd" hierarchy on /sys/fs/cgroup/systemd for compatibility | |
2175 | * with other tools. | |
f08e9287 | 2176 | * |
d4d99bc6 ZJS |
2177 | * To keep live upgrade working, we detect and support v232 layout. When v232 layout is detected, to keep |
2178 | * cgroup v2 process management but disable the compat dual layout, we return true on | |
2179 | * cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) and false on cg_hybrid_unified(). | |
f08e9287 TH |
2180 | */ |
2181 | static thread_local bool unified_systemd_v232; | |
2182 | ||
d4d99bc6 ZJS |
2183 | int cg_unified_cached(bool flush) { |
2184 | static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN; | |
efdb0237 | 2185 | |
efdb0237 LP |
2186 | struct statfs fs; |
2187 | ||
2188 | /* Checks if we support the unified hierarchy. Returns an | |
2189 | * error when the cgroup hierarchies aren't mounted yet or we | |
2190 | * have any other trouble determining if the unified hierarchy | |
2191 | * is supported. */ | |
2192 | ||
d4d99bc6 ZJS |
2193 | if (flush) |
2194 | unified_cache = CGROUP_UNIFIED_UNKNOWN; | |
2195 | else if (unified_cache >= CGROUP_UNIFIED_NONE) | |
2196 | return unified_cache; | |
efdb0237 LP |
2197 | |
2198 | if (statfs("/sys/fs/cgroup/", &fs) < 0) | |
c028bed1 | 2199 | return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/\") failed: %m"); |
efdb0237 | 2200 | |
9aa21133 ZJS |
2201 | if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { |
2202 | log_debug("Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy"); | |
5da38d07 | 2203 | unified_cache = CGROUP_UNIFIED_ALL; |
9aa21133 | 2204 | } else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) { |
2977724b | 2205 | if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 && |
f08e9287 | 2206 | F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { |
9aa21133 | 2207 | log_debug("Found cgroup2 on /sys/fs/cgroup/unified, unified hierarchy for systemd controller"); |
2977724b | 2208 | unified_cache = CGROUP_UNIFIED_SYSTEMD; |
f08e9287 | 2209 | unified_systemd_v232 = false; |
f08e9287 | 2210 | } else { |
2156061f MG |
2211 | if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0) { |
2212 | if (errno == ENOENT) { | |
2213 | /* Some other software may have set up /sys/fs/cgroup in a configuration we do not recognize. */ | |
2214 | log_debug_errno(errno, "Unsupported cgroupsv1 setup detected: name=systemd hierarchy not found."); | |
2215 | return -ENOMEDIUM; | |
2216 | } | |
9aa21133 | 2217 | return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/systemd\" failed: %m"); |
2156061f | 2218 | } |
5535d8f7 EV |
2219 | |
2220 | if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { | |
2221 | log_debug("Found cgroup2 on /sys/fs/cgroup/systemd, unified hierarchy for systemd controller (v232 variant)"); | |
2222 | unified_cache = CGROUP_UNIFIED_SYSTEMD; | |
2223 | unified_systemd_v232 = true; | |
2224 | } else if (F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC)) { | |
2225 | log_debug("Found cgroup on /sys/fs/cgroup/systemd, legacy hierarchy"); | |
2226 | unified_cache = CGROUP_UNIFIED_NONE; | |
2227 | } else { | |
2228 | log_debug("Unexpected filesystem type %llx mounted on /sys/fs/cgroup/systemd, assuming legacy hierarchy", | |
9aa21133 | 2229 | (unsigned long long) fs.f_type); |
5535d8f7 | 2230 | unified_cache = CGROUP_UNIFIED_NONE; |
9aa21133 | 2231 | } |
2977724b | 2232 | } |
0bc5f001 DS |
2233 | } else if (F_TYPE_EQUAL(fs.f_type, SYSFS_MAGIC)) { |
2234 | return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM), | |
2235 | "No filesystem is currently mounted on /sys/fs/cgroup."); | |
baaa35ad ZJS |
2236 | } else |
2237 | return log_debug_errno(SYNTHETIC_ERRNO(ENOMEDIUM), | |
2238 | "Unknown filesystem type %llx mounted on /sys/fs/cgroup.", | |
2239 | (unsigned long long)fs.f_type); | |
efdb0237 | 2240 | |
d4d99bc6 | 2241 | return unified_cache; |
5da38d07 TH |
2242 | } |
2243 | ||
c22800e4 | 2244 | int cg_unified_controller(const char *controller) { |
b4cccbc1 | 2245 | int r; |
5da38d07 | 2246 | |
d4d99bc6 | 2247 | r = cg_unified_cached(false); |
b4cccbc1 LP |
2248 | if (r < 0) |
2249 | return r; | |
5da38d07 | 2250 | |
d4d99bc6 | 2251 | if (r == CGROUP_UNIFIED_NONE) |
fc9ae717 LP |
2252 | return false; |
2253 | ||
d4d99bc6 | 2254 | if (r >= CGROUP_UNIFIED_ALL) |
fc9ae717 LP |
2255 | return true; |
2256 | ||
2257 | return streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER); | |
5da38d07 TH |
2258 | } |
2259 | ||
b4cccbc1 | 2260 | int cg_all_unified(void) { |
4bb652ac LP |
2261 | int r; |
2262 | ||
d4d99bc6 | 2263 | r = cg_unified_cached(false); |
4bb652ac LP |
2264 | if (r < 0) |
2265 | return r; | |
2266 | ||
d4d99bc6 | 2267 | return r >= CGROUP_UNIFIED_ALL; |
efdb0237 LP |
2268 | } |
2269 | ||
b4cccbc1 LP |
2270 | int cg_hybrid_unified(void) { |
2271 | int r; | |
2977724b | 2272 | |
d4d99bc6 | 2273 | r = cg_unified_cached(false); |
b4cccbc1 LP |
2274 | if (r < 0) |
2275 | return r; | |
2977724b | 2276 | |
d4d99bc6 | 2277 | return r == CGROUP_UNIFIED_SYSTEMD && !unified_systemd_v232; |
13c31542 TH |
2278 | } |
2279 | ||
b426b4ee NR |
2280 | int cg_is_delegated(const char *path) { |
2281 | int r; | |
2282 | ||
2283 | assert(path); | |
2284 | ||
2285 | r = cg_get_xattr_bool(path, "trusted.delegate"); | |
6414203c LP |
2286 | if (!ERRNO_IS_NEG_XATTR_ABSENT(r)) |
2287 | return r; | |
b426b4ee | 2288 | |
6414203c LP |
2289 | /* If the trusted xattr isn't set (preferred), then check the untrusted one. Under the assumption |
2290 | * that whoever is trusted enough to own the cgroup, is also trusted enough to decide if it is | |
2291 | * delegated or not this should be safe. */ | |
2292 | r = cg_get_xattr_bool(path, "user.delegate"); | |
2293 | return ERRNO_IS_NEG_XATTR_ABSENT(r) ? false : r; | |
2294 | } | |
2295 | ||
2296 | int cg_is_delegated_fd(int fd) { | |
2297 | int r; | |
2298 | ||
2299 | assert(fd >= 0); | |
2300 | ||
2301 | r = getxattr_at_bool(fd, /* path= */ NULL, "trusted.delegate", /* flags= */ 0); | |
2302 | if (!ERRNO_IS_NEG_XATTR_ABSENT(r)) | |
2303 | return r; | |
2304 | ||
2305 | r = getxattr_at_bool(fd, /* path= */ NULL, "user.delegate", /* flags= */ 0); | |
2306 | return ERRNO_IS_NEG_XATTR_ABSENT(r) ? false : r; | |
b426b4ee NR |
2307 | } |
2308 | ||
6cf96ab4 NR |
2309 | int cg_has_coredump_receive(const char *path) { |
2310 | int r; | |
2311 | ||
2312 | assert(path); | |
2313 | ||
2314 | r = cg_get_xattr_bool(path, "user.coredump_receive"); | |
2315 | if (ERRNO_IS_NEG_XATTR_ABSENT(r)) | |
2316 | return false; | |
2317 | ||
2318 | return r; | |
2319 | } | |
2320 | ||
9be57249 TH |
2321 | const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX] = { |
2322 | [CGROUP_IO_RBPS_MAX] = CGROUP_LIMIT_MAX, | |
2323 | [CGROUP_IO_WBPS_MAX] = CGROUP_LIMIT_MAX, | |
ac06a0cf TH |
2324 | [CGROUP_IO_RIOPS_MAX] = CGROUP_LIMIT_MAX, |
2325 | [CGROUP_IO_WIOPS_MAX] = CGROUP_LIMIT_MAX, | |
9be57249 TH |
2326 | }; |
2327 | ||
2328 | static const char* const cgroup_io_limit_type_table[_CGROUP_IO_LIMIT_TYPE_MAX] = { | |
2329 | [CGROUP_IO_RBPS_MAX] = "IOReadBandwidthMax", | |
2330 | [CGROUP_IO_WBPS_MAX] = "IOWriteBandwidthMax", | |
ac06a0cf TH |
2331 | [CGROUP_IO_RIOPS_MAX] = "IOReadIOPSMax", |
2332 | [CGROUP_IO_WIOPS_MAX] = "IOWriteIOPSMax", | |
9be57249 TH |
2333 | }; |
2334 | ||
2335 | DEFINE_STRING_TABLE_LOOKUP(cgroup_io_limit_type, CGroupIOLimitType); | |
2336 | ||
f0bef277 EV |
2337 | bool is_cgroup_fs(const struct statfs *s) { |
2338 | return is_fs_type(s, CGROUP_SUPER_MAGIC) || | |
2339 | is_fs_type(s, CGROUP2_SUPER_MAGIC); | |
2340 | } | |
2341 | ||
2342 | bool fd_is_cgroup_fs(int fd) { | |
2343 | struct statfs s; | |
2344 | ||
2345 | if (fstatfs(fd, &s) < 0) | |
2346 | return -errno; | |
2347 | ||
2348 | return is_cgroup_fs(&s); | |
2349 | } | |
2350 | ||
b82f71c7 | 2351 | static const char *const cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = { |
efdb0237 LP |
2352 | [CGROUP_CONTROLLER_CPU] = "cpu", |
2353 | [CGROUP_CONTROLLER_CPUACCT] = "cpuacct", | |
047f5d63 | 2354 | [CGROUP_CONTROLLER_CPUSET] = "cpuset", |
13c31542 | 2355 | [CGROUP_CONTROLLER_IO] = "io", |
efdb0237 LP |
2356 | [CGROUP_CONTROLLER_BLKIO] = "blkio", |
2357 | [CGROUP_CONTROLLER_MEMORY] = "memory", | |
3905f127 | 2358 | [CGROUP_CONTROLLER_DEVICES] = "devices", |
03a7b521 | 2359 | [CGROUP_CONTROLLER_PIDS] = "pids", |
17f14955 | 2360 | [CGROUP_CONTROLLER_BPF_FIREWALL] = "bpf-firewall", |
084c7007 | 2361 | [CGROUP_CONTROLLER_BPF_DEVICES] = "bpf-devices", |
506ea51b | 2362 | [CGROUP_CONTROLLER_BPF_FOREIGN] = "bpf-foreign", |
a8e5eb17 | 2363 | [CGROUP_CONTROLLER_BPF_SOCKET_BIND] = "bpf-socket-bind", |
6f50d4f7 | 2364 | [CGROUP_CONTROLLER_BPF_RESTRICT_NETWORK_INTERFACES] = "bpf-restrict-network-interfaces", |
efdb0237 LP |
2365 | }; |
2366 | ||
2367 | DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController); | |
f98c2585 CD |
2368 | |
2369 | CGroupMask get_cpu_accounting_mask(void) { | |
2370 | static CGroupMask needed_mask = (CGroupMask) -1; | |
2371 | ||
2372 | /* On kernel ≥4.15 with unified hierarchy, cpu.stat's usage_usec is | |
2373 | * provided externally from the CPU controller, which means we don't | |
2374 | * need to enable the CPU controller just to get metrics. This is good, | |
2375 | * because enabling the CPU controller comes at a minor performance | |
2376 | * hit, especially when it's propagated deep into large hierarchies. | |
2377 | * There's also no separate CPU accounting controller available within | |
2378 | * a unified hierarchy. | |
2379 | * | |
2380 | * This combination of factors results in the desired cgroup mask to | |
2381 | * enable for CPU accounting varying as follows: | |
2382 | * | |
2383 | * ╔═════════════════════╤═════════════════════╗ | |
2384 | * ║ Linux ≥4.15 │ Linux <4.15 ║ | |
2385 | * ╔═══════════════╬═════════════════════╪═════════════════════╣ | |
2386 | * ║ Unified ║ nothing │ CGROUP_MASK_CPU ║ | |
2387 | * ╟───────────────╫─────────────────────┼─────────────────────╢ | |
2388 | * ║ Hybrid/Legacy ║ CGROUP_MASK_CPUACCT │ CGROUP_MASK_CPUACCT ║ | |
2389 | * ╚═══════════════╩═════════════════════╧═════════════════════╝ | |
2390 | * | |
2391 | * We check kernel version here instead of manually checking whether | |
2392 | * cpu.stat is present for every cgroup, as that check in itself would | |
2393 | * already be fairly expensive. | |
2394 | * | |
2395 | * Kernels where this patch has been backported will therefore have the | |
2396 | * CPU controller enabled unnecessarily. This is more expensive than | |
2397 | * necessary, but harmless. ☺️ | |
2398 | */ | |
2399 | ||
2400 | if (needed_mask == (CGroupMask) -1) { | |
2401 | if (cg_all_unified()) { | |
2402 | struct utsname u; | |
2403 | assert_se(uname(&u) >= 0); | |
2404 | ||
8087644a | 2405 | if (strverscmp_improved(u.release, "4.15") < 0) |
f98c2585 CD |
2406 | needed_mask = CGROUP_MASK_CPU; |
2407 | else | |
2408 | needed_mask = 0; | |
2409 | } else | |
2410 | needed_mask = CGROUP_MASK_CPUACCT; | |
2411 | } | |
2412 | ||
2413 | return needed_mask; | |
2414 | } | |
2415 | ||
2416 | bool cpu_accounting_is_cheap(void) { | |
2417 | return get_cpu_accounting_mask() == 0; | |
2418 | } | |
4d824a4e AZ |
2419 | |
2420 | static const char* const managed_oom_mode_table[_MANAGED_OOM_MODE_MAX] = { | |
2421 | [MANAGED_OOM_AUTO] = "auto", | |
2422 | [MANAGED_OOM_KILL] = "kill", | |
2423 | }; | |
2424 | ||
2425 | DEFINE_STRING_TABLE_LOOKUP(managed_oom_mode, ManagedOOMMode); | |
242d75bd AZ |
2426 | |
2427 | static const char* const managed_oom_preference_table[_MANAGED_OOM_PREFERENCE_MAX] = { | |
2428 | [MANAGED_OOM_PREFERENCE_NONE] = "none", | |
2429 | [MANAGED_OOM_PREFERENCE_AVOID] = "avoid", | |
2430 | [MANAGED_OOM_PREFERENCE_OMIT] = "omit", | |
2431 | }; | |
2432 | ||
2433 | DEFINE_STRING_TABLE_LOOKUP(managed_oom_preference, ManagedOOMPreference); |