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 or user manager... */
1255 t = skip_session(e);
1257 t = skip_user_manager(e);
1261 /* ... and skip more slices if there are any */
1264 return cg_path_decode_unit(e, unit);
1267 int cg_pid_get_user_unit(pid_t pid, char **unit) {
1268 _cleanup_free_ char *cgroup = NULL;
1273 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1277 return cg_path_get_user_unit(cgroup, unit);
1280 int cg_path_get_machine_name(const char *path, char **machine) {
1281 _cleanup_free_ char *u = NULL, *sl = NULL;
1284 r = cg_path_get_unit(path, &u);
1288 sl = strjoin("/run/systemd/machines/unit:", u, NULL);
1292 return readlink_malloc(sl, machine);
1295 int cg_pid_get_machine_name(pid_t pid, char **machine) {
1296 _cleanup_free_ char *cgroup = NULL;
1301 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1305 return cg_path_get_machine_name(cgroup, machine);
1308 int cg_path_get_session(const char *path, char **session) {
1309 const char *e, *n, *x, *y;
1314 /* Skip slices, if there are any */
1315 e = skip_slices(path);
1317 n = strchrnul(e, '/');
1321 s = strndupa(e, n - e);
1324 x = startswith(s, "session-");
1327 y = endswith(x, ".scope");
1334 r = strndup(x, y - x);
1344 int cg_pid_get_session(pid_t pid, char **session) {
1345 _cleanup_free_ char *cgroup = NULL;
1348 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1352 return cg_path_get_session(cgroup, session);
1355 int cg_path_get_owner_uid(const char *path, uid_t *uid) {
1356 _cleanup_free_ char *slice = NULL;
1357 const char *start, *end;
1364 r = cg_path_get_slice(path, &slice);
1368 start = startswith(slice, "user-");
1371 end = endswith(slice, ".slice");
1375 s = strndupa(start, end - start);
1379 if (parse_uid(s, &u) < 0)
1388 int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
1389 _cleanup_free_ char *cgroup = NULL;
1392 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1396 return cg_path_get_owner_uid(cgroup, uid);
1399 int cg_path_get_slice(const char *p, char **slice) {
1400 const char *e = NULL;
1409 p += strspn(p, "/");
1411 n = strcspn(p, "/");
1412 if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) {
1433 int cg_pid_get_slice(pid_t pid, char **slice) {
1434 _cleanup_free_ char *cgroup = NULL;
1439 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1443 return cg_path_get_slice(cgroup, slice);
1446 char *cg_escape(const char *p) {
1447 bool need_prefix = false;
1449 /* This implements very minimal escaping for names to be used
1450 * as file names in the cgroup tree: any name which might
1451 * conflict with a kernel name or is prefixed with '_' is
1452 * prefixed with a '_'. That way, when reading cgroup names it
1453 * is sufficient to remove a single prefixing underscore if
1456 /* The return value of this function (unlike cg_unescape())
1462 streq(p, "notify_on_release") ||
1463 streq(p, "release_agent") ||
1469 dot = strrchr(p, '.');
1472 if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0)
1477 n = strndupa(p, dot - p);
1479 if (check_hierarchy(n) >= 0)
1486 return strappend("_", p);
1491 char *cg_unescape(const char *p) {
1494 /* The return value of this function (unlike cg_escape())
1495 * doesn't need free()! */
1503 #define CONTROLLER_VALID \
1507 bool cg_controller_is_valid(const char *p, bool allow_named) {
1514 s = startswith(p, "name=");
1519 if (*p == 0 || *p == '_')
1522 for (t = p; *t; t++)
1523 if (!strchr(CONTROLLER_VALID, *t))
1526 if (t - p > FILENAME_MAX)
1532 int cg_slice_to_path(const char *unit, char **ret) {
1533 _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
1539 if (!unit_name_is_valid(unit, TEMPLATE_INVALID))
1542 if (!endswith(unit, ".slice"))
1545 p = unit_name_to_prefix(unit);
1549 dash = strchr(p, '-');
1551 _cleanup_free_ char *escaped = NULL;
1552 char n[dash - p + sizeof(".slice")];
1554 strcpy(stpncpy(n, p, dash - p), ".slice");
1556 if (!unit_name_is_valid(n, TEMPLATE_INVALID))
1559 escaped = cg_escape(n);
1563 if (!strextend(&s, escaped, "/", NULL))
1566 dash = strchr(dash+1, '-');
1569 e = cg_escape(unit);
1573 if (!strextend(&s, e, NULL))
1582 int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) {
1583 _cleanup_free_ char *p = NULL;
1586 r = cg_get_path(controller, path, attribute, &p);
1590 return write_string_file_no_create(p, value);
1593 int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) {
1594 _cleanup_free_ char *p = NULL;
1597 r = cg_get_path(controller, path, attribute, &p);
1601 return read_one_line_file(p, ret);
1604 static const char mask_names[] =
1611 int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {
1612 CGroupControllerMask bit = 1;
1616 /* This one will create a cgroup in our private tree, but also
1617 * duplicate it in the trees specified in mask, and remove it
1620 /* First create the cgroup in our own hierarchy. */
1621 r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
1625 /* Then, do the same in the other hierarchies */
1626 NULSTR_FOREACH(n, mask_names) {
1629 else if (supported & bit)
1630 cg_trim(n, path, true);
1638 int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
1639 CGroupControllerMask bit = 1;
1643 r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
1647 NULSTR_FOREACH(n, mask_names) {
1649 if (supported & bit) {
1650 const char *p = NULL;
1653 p = path_callback(bit, userdata);
1658 cg_attach_fallback(n, path, pid);
1667 int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
1672 SET_FOREACH(pidp, pids, i) {
1673 pid_t pid = PTR_TO_LONG(pidp);
1676 q = cg_attach_everywhere(supported, path, pid, path_callback, userdata);
1684 int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
1685 CGroupControllerMask bit = 1;
1689 if (!path_equal(from, to)) {
1690 r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
1695 NULSTR_FOREACH(n, mask_names) {
1696 if (supported & bit) {
1697 const char *p = NULL;
1700 p = to_callback(bit, userdata);
1705 cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, p, false, false);
1714 int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) {
1715 CGroupControllerMask bit = 1;
1719 r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
1723 NULSTR_FOREACH(n, mask_names) {
1724 if (supported & bit)
1725 cg_trim(n, path, delete_root);
1733 CGroupControllerMask cg_mask_supported(void) {
1734 CGroupControllerMask bit = 1, mask = 0;
1737 NULSTR_FOREACH(n, mask_names) {
1738 if (check_hierarchy(n) >= 0)
1747 int cg_kernel_controllers(Set *controllers) {
1748 _cleanup_fclose_ FILE *f = NULL;
1752 assert(controllers);
1754 f = fopen("/proc/cgroups", "re");
1756 if (errno == ENOENT)
1761 /* Ignore the header line */
1762 (void) fgets(buf, sizeof(buf), f);
1769 if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
1774 if (ferror(f) && errno)
1785 if (!filename_is_valid(controller)) {
1790 r = set_consume(controllers, controller);