1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 #include <sys/types.h>
32 #include "cgroup-util.h"
37 #include "path-util.h"
39 #include "unit-name.h"
44 int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
45 _cleanup_free_ char *fs = NULL;
51 r = cg_get_path(controller, path, "cgroup.procs", &fs);
63 int cg_read_pid(FILE *f, pid_t *_pid) {
66 /* Note that the cgroup.procs might contain duplicates! See
67 * cgroups.txt for details. */
73 if (fscanf(f, "%lu", &ul) != 1) {
78 return errno ? -errno : -EIO;
88 int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
89 _cleanup_free_ char *fs = NULL;
95 /* This is not recursive! */
97 r = cg_get_path(controller, path, NULL, &fs);
109 int cg_read_subgroup(DIR *d, char **fn) {
115 FOREACH_DIRENT(de, d, return -errno) {
118 if (de->d_type != DT_DIR)
121 if (streq(de->d_name, ".") ||
122 streq(de->d_name, ".."))
125 b = strdup(de->d_name);
136 int cg_rmdir(const char *controller, const char *path) {
137 _cleanup_free_ char *p = NULL;
140 r = cg_get_path(controller, path, NULL, &p);
145 if (r < 0 && errno != ENOENT)
151 int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) {
152 _cleanup_set_free_ Set *allocated_set = NULL;
159 /* This goes through the tasks list and kills them all. This
160 * is repeated until no further processes are added to the
161 * tasks list, to properly handle forking processes */
164 s = allocated_set = set_new(NULL);
172 _cleanup_fclose_ FILE *f = NULL;
176 r = cg_enumerate_processes(controller, path, &f);
178 if (ret >= 0 && r != -ENOENT)
184 while ((r = cg_read_pid(f, &pid)) > 0) {
186 if (ignore_self && pid == my_pid)
189 if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
192 /* If we haven't killed this process yet, kill
194 if (kill(pid, sig) < 0) {
195 if (ret >= 0 && errno != ESRCH)
198 if (sigcont && sig != SIGKILL)
207 r = set_put(s, LONG_TO_PTR(pid));
223 /* To avoid racing against processes which fork
224 * quicker than we can kill them we repeat this until
225 * no new pids need to be killed. */
232 int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) {
233 _cleanup_set_free_ Set *allocated_set = NULL;
234 _cleanup_closedir_ DIR *d = NULL;
242 s = allocated_set = set_new(NULL);
247 ret = cg_kill(controller, path, sig, sigcont, ignore_self, s);
249 r = cg_enumerate_subgroups(controller, path, &d);
251 if (ret >= 0 && r != -ENOENT)
257 while ((r = cg_read_subgroup(d, &fn)) > 0) {
258 _cleanup_free_ char *p = NULL;
260 p = strjoin(path, "/", fn, NULL);
265 r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s);
266 if (ret >= 0 && r != 0)
270 if (ret >= 0 && r < 0)
274 r = cg_rmdir(controller, path);
275 if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
282 int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) {
284 _cleanup_set_free_ Set *s = NULL;
300 _cleanup_fclose_ FILE *f = NULL;
304 r = cg_enumerate_processes(cfrom, pfrom, &f);
306 if (ret >= 0 && r != -ENOENT)
312 while ((r = cg_read_pid(f, &pid)) > 0) {
314 /* This might do weird stuff if we aren't a
315 * single-threaded program. However, we
316 * luckily know we are not */
317 if (ignore_self && pid == my_pid)
320 if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
323 r = cg_attach(cto, pto, pid);
325 if (ret >= 0 && r != -ESRCH)
332 r = set_put(s, LONG_TO_PTR(pid));
352 int cg_migrate_recursive(
360 _cleanup_closedir_ DIR *d = NULL;
369 ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self);
371 r = cg_enumerate_subgroups(cfrom, pfrom, &d);
373 if (ret >= 0 && r != -ENOENT)
379 while ((r = cg_read_subgroup(d, &fn)) > 0) {
380 _cleanup_free_ char *p = NULL;
382 p = strjoin(pfrom, "/", fn, NULL);
391 r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem);
392 if (r != 0 && ret >= 0)
396 if (r < 0 && ret >= 0)
400 r = cg_rmdir(cfrom, pfrom);
401 if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
408 int cg_migrate_recursive_fallback(
423 r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem);
425 char prefix[strlen(pto) + 1];
427 /* This didn't work? Then let's try all prefixes of the destination */
429 PATH_FOREACH_PREFIX(prefix, pto) {
430 r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem);
439 static const char *normalize_controller(const char *controller) {
443 if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
445 else if (startswith(controller, "name="))
446 return controller + 5;
451 static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
454 if (!isempty(controller)) {
455 if (!isempty(path) && !isempty(suffix))
456 t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
457 else if (!isempty(path))
458 t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
459 else if (!isempty(suffix))
460 t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
462 t = strappend("/sys/fs/cgroup/", controller);
464 if (!isempty(path) && !isempty(suffix))
465 t = strjoin(path, "/", suffix, NULL);
466 else if (!isempty(path))
475 *fs = path_kill_slashes(t);
479 int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
481 static thread_local bool good = false;
485 if (controller && !cg_controller_is_valid(controller, true))
488 if (_unlikely_(!good)) {
491 r = path_is_mount_point("/sys/fs/cgroup", false);
493 return r < 0 ? r : -ENOENT;
495 /* Cache this to save a few stat()s */
499 p = controller ? normalize_controller(controller) : NULL;
501 return join_path(p, path, suffix, fs);
504 static int check_hierarchy(const char *p) {
509 if (!filename_is_valid(p))
512 /* Check if this controller actually really exists */
513 cc = strjoina("/sys/fs/cgroup/", p);
514 if (laccess(cc, F_OK) < 0)
520 int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
526 if (!cg_controller_is_valid(controller, true))
529 /* Normalize the controller syntax */
530 p = normalize_controller(controller);
532 /* Check if this controller actually really exists */
533 r = check_hierarchy(p);
537 return join_path(p, path, suffix, fs);
540 static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
545 if (typeflag != FTW_DP)
548 if (ftwbuf->level < 1)
555 int cg_trim(const char *controller, const char *path, bool delete_root) {
556 _cleanup_free_ char *fs = NULL;
561 r = cg_get_path(controller, path, NULL, &fs);
566 if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0)
567 r = errno ? -errno : -EIO;
570 if (rmdir(fs) < 0 && errno != ENOENT)
577 int cg_delete(const char *controller, const char *path) {
578 _cleanup_free_ char *parent = NULL;
583 r = path_get_parent(path, &parent);
587 r = cg_migrate_recursive(controller, path, controller, parent, false, true);
588 return r == -ENOENT ? 0 : r;
591 int cg_create(const char *controller, const char *path) {
592 _cleanup_free_ char *fs = NULL;
595 r = cg_get_path_and_check(controller, path, NULL, &fs);
599 r = mkdir_parents(fs, 0755);
603 if (mkdir(fs, 0755) < 0) {
614 int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
619 r = cg_create(controller, path);
623 q = cg_attach(controller, path, pid);
627 /* This does not remove the cgroup on failure */
631 int cg_attach(const char *controller, const char *path, pid_t pid) {
632 _cleanup_free_ char *fs = NULL;
633 char c[DECIMAL_STR_MAX(pid_t) + 2];
639 r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs);
646 snprintf(c, sizeof(c), PID_FMT"\n", pid);
648 return write_string_file_no_create(fs, c);
651 int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
658 r = cg_attach(controller, path, pid);
660 char prefix[strlen(path) + 1];
662 /* This didn't work? Then let's try all prefixes of
665 PATH_FOREACH_PREFIX(prefix, path) {
666 r = cg_attach(controller, prefix, pid);
675 int cg_set_group_access(
676 const char *controller,
682 _cleanup_free_ char *fs = NULL;
687 if (mode != MODE_INVALID)
690 r = cg_get_path(controller, path, NULL, &fs);
694 return chmod_and_chown(fs, mode, uid, gid);
697 int cg_set_task_access(
698 const char *controller,
704 _cleanup_free_ char *fs = NULL, *procs = NULL;
709 if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID)
712 if (mode != MODE_INVALID)
715 r = cg_get_path(controller, path, "cgroup.procs", &fs);
719 r = chmod_and_chown(fs, mode, uid, gid);
723 /* Compatibility, Always keep values for "tasks" in sync with
725 r = cg_get_path(controller, path, "tasks", &procs);
729 return chmod_and_chown(procs, mode, uid, gid);
732 int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
733 _cleanup_fclose_ FILE *f = NULL;
742 if (!cg_controller_is_valid(controller, true))
745 controller = normalize_controller(controller);
747 controller = SYSTEMD_CGROUP_CONTROLLER;
749 fs = procfs_file_alloca(pid, "cgroup");
753 return errno == ENOENT ? -ESRCH : -errno;
755 cs = strlen(controller);
757 FOREACH_LINE(line, f, return -errno) {
760 const char *word, *state;
765 l = strchr(line, ':');
776 FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
778 if (k == cs && memcmp(word, controller, cs) == 0) {
784 memcmp(word, "name=", 5) == 0 &&
785 memcmp(word+5, controller, cs) == 0) {
805 int cg_install_release_agent(const char *controller, const char *agent) {
806 _cleanup_free_ char *fs = NULL, *contents = NULL;
812 r = cg_get_path(controller, NULL, "release_agent", &fs);
816 r = read_one_line_file(fs, &contents);
820 sc = strstrip(contents);
822 r = write_string_file_no_create(fs, agent);
825 } else if (!streq(sc, agent))
830 r = cg_get_path(controller, NULL, "notify_on_release", &fs);
836 r = read_one_line_file(fs, &contents);
840 sc = strstrip(contents);
841 if (streq(sc, "0")) {
842 r = write_string_file_no_create(fs, "1");
855 int cg_uninstall_release_agent(const char *controller) {
856 _cleanup_free_ char *fs = NULL;
859 r = cg_get_path(controller, NULL, "notify_on_release", &fs);
863 r = write_string_file_no_create(fs, "0");
870 r = cg_get_path(controller, NULL, "release_agent", &fs);
874 r = write_string_file_no_create(fs, "");
881 int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
882 _cleanup_fclose_ FILE *f = NULL;
883 pid_t pid = 0, self_pid;
889 r = cg_enumerate_processes(controller, path, &f);
891 return r == -ENOENT ? 1 : r;
895 while ((r = cg_read_pid(f, &pid)) > 0) {
897 if (ignore_self && pid == self_pid)
910 int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
911 _cleanup_closedir_ DIR *d = NULL;
917 r = cg_is_empty(controller, path, ignore_self);
921 r = cg_enumerate_subgroups(controller, path, &d);
923 return r == -ENOENT ? 1 : r;
925 while ((r = cg_read_subgroup(d, &fn)) > 0) {
926 _cleanup_free_ char *p = NULL;
928 p = strjoin(path, "/", fn, NULL);
933 r = cg_is_empty_recursive(controller, p, ignore_self);
944 int cg_split_spec(const char *spec, char **controller, char **path) {
946 char *t = NULL, *u = NULL;
947 _cleanup_free_ char *v = NULL;
952 if (!path_is_safe(spec))
960 *path = path_kill_slashes(t);
969 e = strchr(spec, ':');
971 if (!cg_controller_is_valid(spec, true))
975 t = strdup(normalize_controller(spec));
988 v = strndup(spec, e-spec);
991 t = strdup(normalize_controller(v));
994 if (!cg_controller_is_valid(t, true)) {
999 if (streq(e+1, "")) {
1012 if (!path_is_safe(u) ||
1013 !path_is_absolute(u)) {
1019 path_kill_slashes(u);
1035 int cg_mangle_path(const char *path, char **result) {
1036 _cleanup_free_ char *c = NULL, *p = NULL;
1043 /* First, check if it already is a filesystem path */
1044 if (path_startswith(path, "/sys/fs/cgroup")) {
1050 *result = path_kill_slashes(t);
1054 /* Otherwise, treat it as cg spec */
1055 r = cg_split_spec(path, &c, &p);
1059 return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
1062 int cg_get_root_path(char **path) {
1068 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
1072 e = endswith(p, "/" SPECIAL_SYSTEM_SLICE);
1080 int cg_shift_path(const char *cgroup, const char *root, const char **shifted) {
1081 _cleanup_free_ char *rt = NULL;
1089 /* If the root was specified let's use that, otherwise
1090 * let's determine it from PID 1 */
1092 r = cg_get_root_path(&rt);
1099 p = path_startswith(cgroup, root);
1108 int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
1109 _cleanup_free_ char *raw = NULL;
1116 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw);
1120 r = cg_shift_path(raw, root, &c);
1140 int cg_path_decode_unit(const char *cgroup, char **unit){
1146 e = strchrnul(cgroup, '/');
1147 c = strndupa(cgroup, e - cgroup);
1150 if (!unit_name_is_valid(c, TEMPLATE_INVALID))
1161 static const char *skip_slices(const char *p) {
1162 /* Skips over all slice assignments */
1167 p += strspn(p, "/");
1169 n = strcspn(p, "/");
1170 if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0)
1177 int cg_path_get_unit(const char *path, char **unit) {
1183 e = skip_slices(path);
1185 return cg_path_decode_unit(e, unit);
1188 int cg_pid_get_unit(pid_t pid, char **unit) {
1189 _cleanup_free_ char *cgroup = NULL;
1194 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1198 return cg_path_get_unit(cgroup, unit);
1202 * Skip session-*.scope, but require it to be there.
1204 static const char *skip_session(const char *p) {
1209 p += strspn(p, "/");
1211 n = strcspn(p, "/");
1212 if (n < strlen("session-x.scope") || memcmp(p, "session-", 8) != 0 || memcmp(p + n - 6, ".scope", 6) != 0)
1216 p += strspn(p, "/");
1222 * Skip user@*.service, but require it to be there.
1224 static const char *skip_user_manager(const char *p) {
1229 p += strspn(p, "/");
1231 n = strcspn(p, "/");
1232 if (n < strlen("user@x.service") || memcmp(p, "user@", 5) != 0 || memcmp(p + n - 8, ".service", 8) != 0)
1236 p += strspn(p, "/");
1241 int cg_path_get_user_unit(const char *path, char **unit) {
1247 /* We always have to parse the path from the beginning as unit
1248 * cgroups might have arbitrary child cgroups and we shouldn't get
1249 * confused by those */
1251 /* Skip slices, if there are any */
1252 e = skip_slices(path);
1254 /* Skip the session scope... */
1255 t = skip_session(e);
1257 /* ... and skip more slices if there's one */
1260 /* ... or require a user manager unit to be there */
1261 e = skip_user_manager(e);
1266 return cg_path_decode_unit(e, unit);
1269 int cg_pid_get_user_unit(pid_t pid, char **unit) {
1270 _cleanup_free_ char *cgroup = NULL;
1275 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1279 return cg_path_get_user_unit(cgroup, unit);
1282 int cg_path_get_machine_name(const char *path, char **machine) {
1283 _cleanup_free_ char *u = NULL, *sl = NULL;
1286 r = cg_path_get_unit(path, &u);
1290 sl = strjoin("/run/systemd/machines/unit:", u, NULL);
1294 return readlink_malloc(sl, machine);
1297 int cg_pid_get_machine_name(pid_t pid, char **machine) {
1298 _cleanup_free_ char *cgroup = NULL;
1303 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1307 return cg_path_get_machine_name(cgroup, machine);
1310 int cg_path_get_session(const char *path, char **session) {
1311 const char *e, *n, *x, *y;
1316 /* Skip slices, if there are any */
1317 e = skip_slices(path);
1319 n = strchrnul(e, '/');
1323 s = strndupa(e, n - e);
1326 x = startswith(s, "session-");
1329 y = endswith(x, ".scope");
1336 r = strndup(x, y - x);
1346 int cg_pid_get_session(pid_t pid, char **session) {
1347 _cleanup_free_ char *cgroup = NULL;
1350 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1354 return cg_path_get_session(cgroup, session);
1357 int cg_path_get_owner_uid(const char *path, uid_t *uid) {
1358 _cleanup_free_ char *slice = NULL;
1359 const char *start, *end;
1366 r = cg_path_get_slice(path, &slice);
1370 start = startswith(slice, "user-");
1373 end = endswith(slice, ".slice");
1377 s = strndupa(start, end - start);
1381 if (parse_uid(s, &u) < 0)
1390 int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
1391 _cleanup_free_ char *cgroup = NULL;
1394 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1398 return cg_path_get_owner_uid(cgroup, uid);
1401 int cg_path_get_slice(const char *p, char **slice) {
1402 const char *e = NULL;
1411 p += strspn(p, "/");
1413 n = strcspn(p, "/");
1414 if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) {
1435 int cg_pid_get_slice(pid_t pid, char **slice) {
1436 _cleanup_free_ char *cgroup = NULL;
1441 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1445 return cg_path_get_slice(cgroup, slice);
1448 char *cg_escape(const char *p) {
1449 bool need_prefix = false;
1451 /* This implements very minimal escaping for names to be used
1452 * as file names in the cgroup tree: any name which might
1453 * conflict with a kernel name or is prefixed with '_' is
1454 * prefixed with a '_'. That way, when reading cgroup names it
1455 * is sufficient to remove a single prefixing underscore if
1458 /* The return value of this function (unlike cg_unescape())
1464 streq(p, "notify_on_release") ||
1465 streq(p, "release_agent") ||
1471 dot = strrchr(p, '.');
1474 if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0)
1479 n = strndupa(p, dot - p);
1481 if (check_hierarchy(n) >= 0)
1488 return strappend("_", p);
1493 char *cg_unescape(const char *p) {
1496 /* The return value of this function (unlike cg_escape())
1497 * doesn't need free()! */
1505 #define CONTROLLER_VALID \
1509 bool cg_controller_is_valid(const char *p, bool allow_named) {
1516 s = startswith(p, "name=");
1521 if (*p == 0 || *p == '_')
1524 for (t = p; *t; t++)
1525 if (!strchr(CONTROLLER_VALID, *t))
1528 if (t - p > FILENAME_MAX)
1534 int cg_slice_to_path(const char *unit, char **ret) {
1535 _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
1541 if (!unit_name_is_valid(unit, TEMPLATE_INVALID))
1544 if (!endswith(unit, ".slice"))
1547 p = unit_name_to_prefix(unit);
1551 dash = strchr(p, '-');
1553 _cleanup_free_ char *escaped = NULL;
1554 char n[dash - p + sizeof(".slice")];
1556 strcpy(stpncpy(n, p, dash - p), ".slice");
1558 if (!unit_name_is_valid(n, TEMPLATE_INVALID))
1561 escaped = cg_escape(n);
1565 if (!strextend(&s, escaped, "/", NULL))
1568 dash = strchr(dash+1, '-');
1571 e = cg_escape(unit);
1575 if (!strextend(&s, e, NULL))
1584 int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) {
1585 _cleanup_free_ char *p = NULL;
1588 r = cg_get_path(controller, path, attribute, &p);
1592 return write_string_file_no_create(p, value);
1595 int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) {
1596 _cleanup_free_ char *p = NULL;
1599 r = cg_get_path(controller, path, attribute, &p);
1603 return read_one_line_file(p, ret);
1606 static const char mask_names[] =
1613 int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {
1614 CGroupControllerMask bit = 1;
1618 /* This one will create a cgroup in our private tree, but also
1619 * duplicate it in the trees specified in mask, and remove it
1622 /* First create the cgroup in our own hierarchy. */
1623 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
1627 /* Then, do the same in the other hierarchies */
1628 NULSTR_FOREACH(n, mask_names) {
1631 else if (supported & bit)
1632 cg_trim(n, path, true);
1640 int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
1641 CGroupControllerMask bit = 1;
1645 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
1649 NULSTR_FOREACH(n, mask_names) {
1651 if (supported & bit) {
1652 const char *p = NULL;
1655 p = path_callback(bit, userdata);
1660 cg_attach_fallback(n, path, pid);
1669 int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
1674 SET_FOREACH(pidp, pids, i) {
1675 pid_t pid = PTR_TO_LONG(pidp);
1678 q = cg_attach_everywhere(supported, path, pid, path_callback, userdata);
1686 int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
1687 CGroupControllerMask bit = 1;
1691 if (!path_equal(from, to)) {
1692 r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
1697 NULSTR_FOREACH(n, mask_names) {
1698 if (supported & bit) {
1699 const char *p = NULL;
1702 p = to_callback(bit, userdata);
1707 cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false);
1716 int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) {
1717 CGroupControllerMask bit = 1;
1721 r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
1725 NULSTR_FOREACH(n, mask_names) {
1726 if (supported & bit)
1727 cg_trim(n, path, delete_root);
1735 CGroupControllerMask cg_mask_supported(void) {
1736 CGroupControllerMask bit = 1, mask = 0;
1739 NULSTR_FOREACH(n, mask_names) {
1740 if (check_hierarchy(n) >= 0)
1749 int cg_kernel_controllers(Set *controllers) {
1750 _cleanup_fclose_ FILE *f = NULL;
1754 assert(controllers);
1756 f = fopen("/proc/cgroups", "re");
1758 if (errno == ENOENT)
1763 /* Ignore the header line */
1764 (void) fgets(buf, sizeof(buf), f);
1771 if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
1776 if (ferror(f) && errno)
1787 if (!filename_is_valid(controller)) {
1792 r = set_consume(controllers, controller);