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(trivial_hash_func, trivial_compare_func);
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)
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(trivial_hash_func, trivial_compare_func);
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;
293 s = set_new(trivial_hash_func, trivial_compare_func);
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 path_kill_slashes(t);
481 int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
483 static thread_local bool good = false;
487 if (controller && !cg_controller_is_valid(controller, true))
490 if (_unlikely_(!good)) {
493 r = path_is_mount_point("/sys/fs/cgroup", false);
495 return r < 0 ? r : -ENOENT;
497 /* Cache this to save a few stat()s */
501 p = controller ? normalize_controller(controller) : NULL;
503 return join_path(p, path, suffix, fs);
506 static int check_hierarchy(const char *p) {
511 /* Check if this controller actually really exists */
512 cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p));
513 strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p);
514 if (access(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), "%lu\n", (unsigned long) pid);
648 return write_string_file(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_t) -1)
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_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1)
712 if (mode != (mode_t) -1)
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) {
765 l = strchr(line, ':');
776 FOREACH_WORD_SEPARATOR(w, k, l, ",", state) {
778 if (k == cs && memcmp(w, controller, cs) == 0) {
784 memcmp(w, "name=", 5) == 0 &&
785 memcmp(w+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(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(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(fs, "0");
870 r = cg_get_path(controller, NULL, "release_agent", &fs);
874 r = write_string_file(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_kill_slashes(t);
970 e = strchr(spec, ':');
972 if (!cg_controller_is_valid(spec, true))
976 t = strdup(normalize_controller(spec));
989 v = strndup(spec, e-spec);
992 t = strdup(normalize_controller(v));
995 if (!cg_controller_is_valid(t, true)) {
1000 if (streq(e+1, "")) {
1013 if (!path_is_safe(u) ||
1014 !path_is_absolute(u)) {
1020 path_kill_slashes(u);
1036 int cg_mangle_path(const char *path, char **result) {
1037 _cleanup_free_ char *c = NULL, *p = NULL;
1044 /* First, check if it already is a filesystem path */
1045 if (path_startswith(path, "/sys/fs/cgroup")) {
1051 path_kill_slashes(t);
1056 /* Otherwise, treat it as cg spec */
1057 r = cg_split_spec(path, &c, &p);
1061 return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
1064 int cg_get_root_path(char **path) {
1070 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
1074 e = endswith(p, "/" SPECIAL_SYSTEM_SLICE);
1082 int cg_shift_path(const char *cgroup, const char *root, const char **shifted) {
1083 _cleanup_free_ char *rt = NULL;
1091 /* If the root was specified let's use that, otherwise
1092 * let's determine it from PID 1 */
1094 r = cg_get_root_path(&rt);
1101 p = path_startswith(cgroup, root);
1110 int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
1111 _cleanup_free_ char *raw = NULL;
1118 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw);
1122 r = cg_shift_path(raw, root, &c);
1142 int cg_path_decode_unit(const char *cgroup, char **unit){
1148 e = strchrnul(cgroup, '/');
1149 c = strndupa(cgroup, e - cgroup);
1152 if (!unit_name_is_valid(c, TEMPLATE_INVALID))
1163 static const char *skip_slices(const char *p) {
1164 /* Skips over all slice assignments */
1169 p += strspn(p, "/");
1171 n = strcspn(p, "/");
1172 if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0)
1179 int cg_path_get_unit(const char *path, char **unit) {
1185 e = skip_slices(path);
1187 return cg_path_decode_unit(e, unit);
1190 int cg_pid_get_unit(pid_t pid, char **unit) {
1191 _cleanup_free_ char *cgroup = NULL;
1196 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1200 return cg_path_get_unit(cgroup, unit);
1204 * Skip session-*.scope, but require it to be there.
1206 static const char *skip_session(const char *p) {
1211 p += strspn(p, "/");
1213 n = strcspn(p, "/");
1214 if (n < strlen("session-x.scope") || memcmp(p, "session-", 8) != 0 || memcmp(p + n - 6, ".scope", 6) != 0)
1218 p += strspn(p, "/");
1224 * Skip user@*.service, but require it to be there.
1226 static const char *skip_user_manager(const char *p) {
1231 p += strspn(p, "/");
1233 n = strcspn(p, "/");
1234 if (n < strlen("user@x.service") || memcmp(p, "user@", 5) != 0 || memcmp(p + n - 8, ".service", 8) != 0)
1238 p += strspn(p, "/");
1243 int cg_path_get_user_unit(const char *path, char **unit) {
1249 /* We always have to parse the path from the beginning as unit
1250 * cgroups might have arbitrary child cgroups and we shouldn't get
1251 * confused by those */
1253 /* Skip slices, if there are any */
1254 e = skip_slices(path);
1256 /* Skip the session scope... */
1257 t = skip_session(e);
1259 /* ... and skip more slices if there's one */
1262 /* ... or require a user manager unit to be there */
1263 e = skip_user_manager(e);
1268 return cg_path_decode_unit(e, unit);
1271 int cg_pid_get_user_unit(pid_t pid, char **unit) {
1272 _cleanup_free_ char *cgroup = NULL;
1277 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1281 return cg_path_get_user_unit(cgroup, unit);
1284 int cg_path_get_machine_name(const char *path, char **machine) {
1285 _cleanup_free_ char *u = NULL, *sl = NULL;
1288 r = cg_path_get_unit(path, &u);
1292 sl = strjoin("/run/systemd/machines/unit:", u, NULL);
1296 return readlink_malloc(sl, machine);
1299 int cg_pid_get_machine_name(pid_t pid, char **machine) {
1300 _cleanup_free_ char *cgroup = NULL;
1305 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1309 return cg_path_get_machine_name(cgroup, machine);
1312 int cg_path_get_session(const char *path, char **session) {
1313 const char *e, *n, *x;
1319 /* Skip slices, if there are any */
1320 e = skip_slices(path);
1322 n = strchrnul(e, '/');
1326 s = strndupa(e, n - e);
1329 x = startswith(s, "session-");
1332 if (!endswith(x, ".scope"))
1342 r = strndup(x, l - 6);
1352 int cg_pid_get_session(pid_t pid, char **session) {
1353 _cleanup_free_ char *cgroup = NULL;
1356 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1360 return cg_path_get_session(cgroup, session);
1363 int cg_path_get_owner_uid(const char *path, uid_t *uid) {
1364 _cleanup_free_ char *slice = NULL;
1365 const char *start, *end;
1372 r = cg_path_get_slice(path, &slice);
1376 start = startswith(slice, "user-");
1379 end = endswith(slice, ".slice");
1383 s = strndupa(start, end - start);
1387 if (parse_uid(s, &u) < 0)
1396 int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
1397 _cleanup_free_ char *cgroup = NULL;
1400 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1404 return cg_path_get_owner_uid(cgroup, uid);
1407 int cg_path_get_slice(const char *p, char **slice) {
1408 const char *e = NULL;
1417 p += strspn(p, "/");
1419 n = strcspn(p, "/");
1420 if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) {
1441 int cg_pid_get_slice(pid_t pid, char **slice) {
1442 _cleanup_free_ char *cgroup = NULL;
1447 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1451 return cg_path_get_slice(cgroup, slice);
1454 char *cg_escape(const char *p) {
1455 bool need_prefix = false;
1457 /* This implements very minimal escaping for names to be used
1458 * as file names in the cgroup tree: any name which might
1459 * conflict with a kernel name or is prefixed with '_' is
1460 * prefixed with a '_'. That way, when reading cgroup names it
1461 * is sufficient to remove a single prefixing underscore if
1464 /* The return value of this function (unlike cg_unescape())
1470 streq(p, "notify_on_release") ||
1471 streq(p, "release_agent") ||
1477 dot = strrchr(p, '.');
1480 if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0)
1485 n = strndupa(p, dot - p);
1487 if (check_hierarchy(n) >= 0)
1494 return strappend("_", p);
1499 char *cg_unescape(const char *p) {
1502 /* The return value of this function (unlike cg_escape())
1503 * doesn't need free()! */
1511 #define CONTROLLER_VALID \
1515 bool cg_controller_is_valid(const char *p, bool allow_named) {
1522 s = startswith(p, "name=");
1527 if (*p == 0 || *p == '_')
1530 for (t = p; *t; t++)
1531 if (!strchr(CONTROLLER_VALID, *t))
1534 if (t - p > FILENAME_MAX)
1540 int cg_slice_to_path(const char *unit, char **ret) {
1541 _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
1547 if (!unit_name_is_valid(unit, TEMPLATE_INVALID))
1550 if (!endswith(unit, ".slice"))
1553 p = unit_name_to_prefix(unit);
1557 dash = strchr(p, '-');
1559 _cleanup_free_ char *escaped = NULL;
1560 char n[dash - p + sizeof(".slice")];
1562 strcpy(stpncpy(n, p, dash - p), ".slice");
1564 if (!unit_name_is_valid(n, TEMPLATE_INVALID))
1567 escaped = cg_escape(n);
1571 if (!strextend(&s, escaped, "/", NULL))
1574 dash = strchr(dash+1, '-');
1577 e = cg_escape(unit);
1581 if (!strextend(&s, e, NULL))
1590 int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) {
1591 _cleanup_free_ char *p = NULL;
1594 r = cg_get_path(controller, path, attribute, &p);
1598 return write_string_file(p, value);
1601 static const char mask_names[] =
1608 int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {
1609 CGroupControllerMask bit = 1;
1613 /* This one will create a cgroup in our private tree, but also
1614 * duplicate it in the trees specified in mask, and remove it
1617 /* First create the cgroup in our own hierarchy. */
1618 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
1622 /* Then, do the same in the other hierarchies */
1623 NULSTR_FOREACH(n, mask_names) {
1626 else if (supported & bit)
1627 cg_trim(n, path, true);
1635 int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid) {
1636 CGroupControllerMask bit = 1;
1640 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
1644 NULSTR_FOREACH(n, mask_names) {
1645 if (supported & bit)
1646 cg_attach_fallback(n, path, pid);
1654 int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids) {
1659 SET_FOREACH(pidp, pids, i) {
1660 pid_t pid = PTR_TO_LONG(pidp);
1663 q = cg_attach_everywhere(supported, path, pid);
1671 int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
1672 CGroupControllerMask bit = 1;
1676 if (!path_equal(from, to)) {
1677 r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
1682 NULSTR_FOREACH(n, mask_names) {
1683 if (supported & bit) {
1684 const char *p = NULL;
1687 p = to_callback(bit, userdata);
1692 cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false);
1701 int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) {
1702 CGroupControllerMask bit = 1;
1706 r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
1710 NULSTR_FOREACH(n, mask_names) {
1711 if (supported & bit)
1712 cg_trim(n, path, delete_root);
1720 CGroupControllerMask cg_mask_supported(void) {
1721 CGroupControllerMask bit = 1, mask = 0;
1724 NULSTR_FOREACH(n, mask_names) {
1725 if (check_hierarchy(n) >= 0)