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"
36 #include "formats-util.h"
37 #include "process-util.h"
38 #include "path-util.h"
39 #include "unit-name.h"
43 #include "login-util.h"
45 int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
46 _cleanup_free_ char *fs = NULL;
52 r = cg_get_path(controller, path, "cgroup.procs", &fs);
64 int cg_read_pid(FILE *f, pid_t *_pid) {
67 /* Note that the cgroup.procs might contain duplicates! See
68 * cgroups.txt for details. */
74 if (fscanf(f, "%lu", &ul) != 1) {
79 return errno ? -errno : -EIO;
89 int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
90 _cleanup_free_ char *fs = NULL;
96 /* This is not recursive! */
98 r = cg_get_path(controller, path, NULL, &fs);
110 int cg_read_subgroup(DIR *d, char **fn) {
116 FOREACH_DIRENT(de, d, return -errno) {
119 if (de->d_type != DT_DIR)
122 if (streq(de->d_name, ".") ||
123 streq(de->d_name, ".."))
126 b = strdup(de->d_name);
137 int cg_rmdir(const char *controller, const char *path) {
138 _cleanup_free_ char *p = NULL;
141 r = cg_get_path(controller, path, NULL, &p);
146 if (r < 0 && errno != ENOENT)
152 int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) {
153 _cleanup_set_free_ Set *allocated_set = NULL;
160 /* This goes through the tasks list and kills them all. This
161 * is repeated until no further processes are added to the
162 * tasks list, to properly handle forking processes */
165 s = allocated_set = set_new(NULL);
173 _cleanup_fclose_ FILE *f = NULL;
177 r = cg_enumerate_processes(controller, path, &f);
179 if (ret >= 0 && r != -ENOENT)
185 while ((r = cg_read_pid(f, &pid)) > 0) {
187 if (ignore_self && pid == my_pid)
190 if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
193 /* If we haven't killed this process yet, kill
195 if (kill(pid, sig) < 0) {
196 if (ret >= 0 && errno != ESRCH)
199 if (sigcont && sig != SIGKILL)
208 r = set_put(s, LONG_TO_PTR(pid));
224 /* To avoid racing against processes which fork
225 * quicker than we can kill them we repeat this until
226 * no new pids need to be killed. */
233 int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) {
234 _cleanup_set_free_ Set *allocated_set = NULL;
235 _cleanup_closedir_ DIR *d = NULL;
243 s = allocated_set = set_new(NULL);
248 ret = cg_kill(controller, path, sig, sigcont, ignore_self, s);
250 r = cg_enumerate_subgroups(controller, path, &d);
252 if (ret >= 0 && r != -ENOENT)
258 while ((r = cg_read_subgroup(d, &fn)) > 0) {
259 _cleanup_free_ char *p = NULL;
261 p = strjoin(path, "/", fn, NULL);
266 r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s);
267 if (ret >= 0 && r != 0)
271 if (ret >= 0 && r < 0)
275 r = cg_rmdir(controller, path);
276 if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
283 int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) {
285 _cleanup_set_free_ Set *s = NULL;
301 _cleanup_fclose_ FILE *f = NULL;
305 r = cg_enumerate_processes(cfrom, pfrom, &f);
307 if (ret >= 0 && r != -ENOENT)
313 while ((r = cg_read_pid(f, &pid)) > 0) {
315 /* This might do weird stuff if we aren't a
316 * single-threaded program. However, we
317 * luckily know we are not */
318 if (ignore_self && pid == my_pid)
321 if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
324 r = cg_attach(cto, pto, pid);
326 if (ret >= 0 && r != -ESRCH)
333 r = set_put(s, LONG_TO_PTR(pid));
353 int cg_migrate_recursive(
361 _cleanup_closedir_ DIR *d = NULL;
370 ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self);
372 r = cg_enumerate_subgroups(cfrom, pfrom, &d);
374 if (ret >= 0 && r != -ENOENT)
380 while ((r = cg_read_subgroup(d, &fn)) > 0) {
381 _cleanup_free_ char *p = NULL;
383 p = strjoin(pfrom, "/", fn, NULL);
392 r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem);
393 if (r != 0 && ret >= 0)
397 if (r < 0 && ret >= 0)
401 r = cg_rmdir(cfrom, pfrom);
402 if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
409 int cg_migrate_recursive_fallback(
424 r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem);
426 char prefix[strlen(pto) + 1];
428 /* This didn't work? Then let's try all prefixes of the destination */
430 PATH_FOREACH_PREFIX(prefix, pto) {
431 r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem);
440 static const char *normalize_controller(const char *controller) {
444 if (startswith(controller, "name="))
445 return controller + 5;
450 static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
453 if (!isempty(controller)) {
454 if (!isempty(path) && !isempty(suffix))
455 t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
456 else if (!isempty(path))
457 t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
458 else if (!isempty(suffix))
459 t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
461 t = strappend("/sys/fs/cgroup/", controller);
463 if (!isempty(path) && !isempty(suffix))
464 t = strjoin(path, "/", suffix, NULL);
465 else if (!isempty(path))
474 *fs = path_kill_slashes(t);
478 int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
480 static thread_local bool good = false;
484 if (controller && !cg_controller_is_valid(controller))
487 if (_unlikely_(!good)) {
490 r = path_is_mount_point("/sys/fs/cgroup", 0);
496 /* Cache this to save a few stat()s */
500 p = controller ? normalize_controller(controller) : NULL;
502 return join_path(p, path, suffix, fs);
505 static int check_hierarchy(const char *p) {
510 if (!filename_is_valid(p))
513 /* Check if this controller actually really exists */
514 cc = strjoina("/sys/fs/cgroup/", p);
515 if (laccess(cc, F_OK) < 0)
521 int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
527 if (!cg_controller_is_valid(controller))
530 /* Normalize the controller syntax */
531 p = normalize_controller(controller);
533 /* Check if this controller actually really exists */
534 r = check_hierarchy(p);
538 return join_path(p, path, suffix, fs);
541 static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
546 if (typeflag != FTW_DP)
549 if (ftwbuf->level < 1)
556 int cg_trim(const char *controller, const char *path, bool delete_root) {
557 _cleanup_free_ char *fs = NULL;
562 r = cg_get_path(controller, path, NULL, &fs);
567 if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0)
568 r = errno ? -errno : -EIO;
571 if (rmdir(fs) < 0 && errno != ENOENT)
578 /// UNNEDED by elogind
580 int cg_delete(const char *controller, const char *path) {
581 _cleanup_free_ char *parent = NULL;
586 r = path_get_parent(path, &parent);
590 r = cg_migrate_recursive(controller, path, controller, parent, false, true);
591 return r == -ENOENT ? 0 : r;
595 int cg_create(const char *controller, const char *path) {
596 _cleanup_free_ char *fs = NULL;
599 r = cg_get_path_and_check(controller, path, NULL, &fs);
603 r = mkdir_parents(fs, 0755);
607 if (mkdir(fs, 0755) < 0) {
618 /// UNNEEDED by elogind
620 int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
625 r = cg_create(controller, path);
629 q = cg_attach(controller, path, pid);
633 /* This does not remove the cgroup on failure */
638 int cg_attach(const char *controller, const char *path, pid_t pid) {
639 _cleanup_free_ char *fs = NULL;
640 char c[DECIMAL_STR_MAX(pid_t) + 2];
646 r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs);
653 snprintf(c, sizeof(c), PID_FMT"\n", pid);
655 return write_string_file_no_create(fs, c);
658 int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
665 r = cg_attach(controller, path, pid);
667 char prefix[strlen(path) + 1];
669 /* This didn't work? Then let's try all prefixes of
672 PATH_FOREACH_PREFIX(prefix, path) {
673 r = cg_attach(controller, prefix, pid);
682 /// UNNEEDED by elogind
684 int cg_set_group_access(
685 const char *controller,
691 _cleanup_free_ char *fs = NULL;
696 if (mode != MODE_INVALID)
699 r = cg_get_path(controller, path, NULL, &fs);
703 return chmod_and_chown(fs, mode, uid, gid);
706 int cg_set_task_access(
707 const char *controller,
713 _cleanup_free_ char *fs = NULL, *procs = NULL;
718 if (mode == MODE_INVALID && uid == UID_INVALID && gid == GID_INVALID)
721 if (mode != MODE_INVALID)
724 r = cg_get_path(controller, path, "cgroup.procs", &fs);
728 r = chmod_and_chown(fs, mode, uid, gid);
732 /* Compatibility, Always keep values for "tasks" in sync with
734 r = cg_get_path(controller, path, "tasks", &procs);
738 return chmod_and_chown(procs, mode, uid, gid);
742 int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
743 _cleanup_fclose_ FILE *f = NULL;
752 if (!cg_controller_is_valid(controller))
755 controller = normalize_controller(controller);
757 controller = ELOGIND_CGROUP_CONTROLLER;
759 fs = procfs_file_alloca(pid, "cgroup");
763 return errno == ENOENT ? -ESRCH : -errno;
765 cs = strlen(controller);
767 FOREACH_LINE(line, f, return -errno) {
770 const char *word, *state;
775 l = strchr(line, ':');
786 FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
788 if (k == cs && memcmp(word, controller, cs) == 0) {
794 memcmp(word, "name=", 5) == 0 &&
795 memcmp(word+5, controller, cs) == 0) {
815 /// UNNEEDED by elogind
817 int cg_install_release_agent(const char *controller, const char *agent) {
818 _cleanup_free_ char *fs = NULL, *contents = NULL;
824 r = cg_get_path(controller, NULL, "release_agent", &fs);
828 r = read_one_line_file(fs, &contents);
832 sc = strstrip(contents);
834 r = write_string_file_no_create(fs, agent);
837 } else if (!streq(sc, agent))
842 r = cg_get_path(controller, NULL, "notify_on_release", &fs);
848 r = read_one_line_file(fs, &contents);
852 sc = strstrip(contents);
853 if (streq(sc, "0")) {
854 r = write_string_file_no_create(fs, "1");
867 int cg_uninstall_release_agent(const char *controller) {
868 _cleanup_free_ char *fs = NULL;
871 r = cg_get_path(controller, NULL, "notify_on_release", &fs);
875 r = write_string_file_no_create(fs, "0");
882 r = cg_get_path(controller, NULL, "release_agent", &fs);
886 r = write_string_file_no_create(fs, "");
894 int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
895 _cleanup_fclose_ FILE *f = NULL;
896 pid_t pid = 0, self_pid;
902 r = cg_enumerate_processes(controller, path, &f);
904 return r == -ENOENT ? 1 : r;
908 while ((r = cg_read_pid(f, &pid)) > 0) {
910 if (ignore_self && pid == self_pid)
923 int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
924 _cleanup_closedir_ DIR *d = NULL;
930 r = cg_is_empty(controller, path, ignore_self);
934 r = cg_enumerate_subgroups(controller, path, &d);
936 return r == -ENOENT ? 1 : r;
938 while ((r = cg_read_subgroup(d, &fn)) > 0) {
939 _cleanup_free_ char *p = NULL;
941 p = strjoin(path, "/", fn, NULL);
946 r = cg_is_empty_recursive(controller, p, ignore_self);
957 int cg_split_spec(const char *spec, char **controller, char **path) {
959 char *t = NULL, *u = NULL;
960 _cleanup_free_ char *v = NULL;
965 if (!path_is_safe(spec))
973 *path = path_kill_slashes(t);
982 e = strchr(spec, ':');
984 if (!cg_controller_is_valid(spec))
988 t = strdup(normalize_controller(spec));
1001 v = strndup(spec, e-spec);
1004 t = strdup(normalize_controller(v));
1007 if (!cg_controller_is_valid(t)) {
1012 if (streq(e+1, "")) {
1025 if (!path_is_safe(u) ||
1026 !path_is_absolute(u)) {
1032 path_kill_slashes(u);
1048 int cg_mangle_path(const char *path, char **result) {
1049 _cleanup_free_ char *c = NULL, *p = NULL;
1056 /* First, check if it already is a filesystem path */
1057 if (path_startswith(path, "/sys/fs/cgroup")) {
1063 *result = path_kill_slashes(t);
1067 /* Otherwise, treat it as cg spec */
1068 r = cg_split_spec(path, &c, &p);
1072 return cg_get_path(c ? c : ELOGIND_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
1075 int cg_get_root_path(char **path) {
1081 r = cg_pid_get_path(ELOGIND_CGROUP_CONTROLLER, 1, &p);
1085 e = endswith(p, "/" SPECIAL_SYSTEM_SLICE);
1093 int cg_shift_path(const char *cgroup, const char *root, const char **shifted) {
1094 _cleanup_free_ char *rt = NULL;
1102 /* If the root was specified let's use that, otherwise
1103 * let's determine it from PID 1 */
1105 r = cg_get_root_path(&rt);
1112 p = path_startswith(cgroup, root);
1121 int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
1122 _cleanup_free_ char *raw = NULL;
1129 r = cg_pid_get_path(ELOGIND_CGROUP_CONTROLLER, pid, &raw);
1133 r = cg_shift_path(raw, root, &c);
1153 int cg_path_decode_unit(const char *cgroup, char **unit){
1160 n = strcspn(cgroup, "/");
1164 c = strndupa(cgroup, n);
1167 if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
1178 static bool valid_slice_name(const char *p, size_t n) {
1183 if (n < strlen("x.slice"))
1186 if (memcmp(p + n - 6, ".slice", 6) == 0) {
1192 c = cg_unescape(buf);
1194 return unit_name_is_valid(c, UNIT_NAME_PLAIN);
1200 static const char *skip_slices(const char *p) {
1203 /* Skips over all slice assignments */
1208 p += strspn(p, "/");
1210 n = strcspn(p, "/");
1211 if (!valid_slice_name(p, n))
1218 int cg_path_get_unit(const char *path, char **ret) {
1226 e = skip_slices(path);
1228 r = cg_path_decode_unit(e, &unit);
1232 /* We skipped over the slices, don't accept any now */
1233 if (endswith(unit, ".slice")) {
1242 int cg_pid_get_unit(pid_t pid, char **unit) {
1243 _cleanup_free_ char *cgroup = NULL;
1248 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1252 return cg_path_get_unit(cgroup, unit);
1256 * Skip session-*.scope, but require it to be there.
1258 static const char *skip_session(const char *p) {
1264 p += strspn(p, "/");
1266 n = strcspn(p, "/");
1267 if (n < strlen("session-x.scope"))
1270 if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) {
1271 char buf[n - 8 - 6 + 1];
1273 memcpy(buf, p + 8, n - 8 - 6);
1276 /* Note that session scopes never need unescaping,
1277 * since they cannot conflict with the kernel's own
1278 * names, hence we don't need to call cg_unescape()
1281 if (!session_id_valid(buf))
1285 p += strspn(p, "/");
1293 * Skip user@*.service, but require it to be there.
1295 static const char *skip_user_manager(const char *p) {
1301 p += strspn(p, "/");
1303 n = strcspn(p, "/");
1304 if (n < strlen("user@x.service"))
1307 if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) {
1308 char buf[n - 5 - 8 + 1];
1310 memcpy(buf, p + 5, n - 5 - 8);
1313 /* Note that user manager services never need unescaping,
1314 * since they cannot conflict with the kernel's own
1315 * names, hence we don't need to call cg_unescape()
1318 if (parse_uid(buf, NULL) < 0)
1322 p += strspn(p, "/");
1330 static const char *skip_user_prefix(const char *path) {
1335 /* Skip slices, if there are any */
1336 e = skip_slices(path);
1338 /* Skip the user manager, if it's in the path now... */
1339 t = skip_user_manager(e);
1343 /* Alternatively skip the user session if it is in the path... */
1344 return skip_session(e);
1347 int cg_path_get_user_unit(const char *path, char **ret) {
1353 t = skip_user_prefix(path);
1357 /* And from here on it looks pretty much the same as for a
1358 * system unit, hence let's use the same parser from here
1360 return cg_path_get_unit(t, ret);
1363 /// UNNEDED by elogind
1365 int cg_pid_get_user_unit(pid_t pid, char **unit) {
1366 _cleanup_free_ char *cgroup = NULL;
1371 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1375 return cg_path_get_user_unit(cgroup, unit);
1379 int cg_path_get_machine_name(const char *path, char **machine) {
1380 _cleanup_free_ char *u = NULL, *sl = NULL;
1383 r = cg_path_get_unit(path, &u);
1387 sl = strjoin("/run/systemd/machines/unit:", u, NULL);
1391 return readlink_malloc(sl, machine);
1394 /// UNNEDED by elogind
1396 int cg_pid_get_machine_name(pid_t pid, char **machine) {
1397 _cleanup_free_ char *cgroup = NULL;
1402 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1406 return cg_path_get_machine_name(cgroup, machine);
1410 int cg_path_get_session(const char *path, char **session) {
1411 _cleanup_free_ char *unit = NULL;
1417 r = cg_path_get_unit(path, &unit);
1421 start = startswith(unit, "session-");
1424 end = endswith(start, ".scope");
1429 if (!session_id_valid(start))
1445 int cg_pid_get_session(pid_t pid, char **session) {
1446 _cleanup_free_ char *cgroup = NULL;
1449 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1453 return cg_path_get_session(cgroup, session);
1456 int cg_path_get_owner_uid(const char *path, uid_t *uid) {
1457 _cleanup_free_ char *slice = NULL;
1463 r = cg_path_get_slice(path, &slice);
1467 start = startswith(slice, "user-");
1470 end = endswith(start, ".slice");
1475 if (parse_uid(start, uid) < 0)
1481 /// UNNEDED by elogind
1483 int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
1484 _cleanup_free_ char *cgroup = NULL;
1487 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1491 return cg_path_get_owner_uid(cgroup, uid);
1495 int cg_path_get_slice(const char *p, char **slice) {
1496 const char *e = NULL;
1501 /* Finds the right-most slice unit from the beginning, but
1502 * stops before we come to the first non-slice unit. */
1507 p += strspn(p, "/");
1509 n = strcspn(p, "/");
1510 if (!valid_slice_name(p, n)) {
1515 s = strdup("-.slice");
1523 return cg_path_decode_unit(e, slice);
1531 int cg_pid_get_slice(pid_t pid, char **slice) {
1532 _cleanup_free_ char *cgroup = NULL;
1537 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1541 return cg_path_get_slice(cgroup, slice);
1544 int cg_path_get_user_slice(const char *p, char **slice) {
1549 t = skip_user_prefix(p);
1553 /* And now it looks pretty much the same as for a system
1554 * slice, so let's just use the same parser from here on. */
1555 return cg_path_get_slice(t, slice);
1558 int cg_pid_get_user_slice(pid_t pid, char **slice) {
1559 _cleanup_free_ char *cgroup = NULL;
1564 r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
1568 return cg_path_get_user_slice(cgroup, slice);
1571 char *cg_escape(const char *p) {
1572 bool need_prefix = false;
1574 /* This implements very minimal escaping for names to be used
1575 * as file names in the cgroup tree: any name which might
1576 * conflict with a kernel name or is prefixed with '_' is
1577 * prefixed with a '_'. That way, when reading cgroup names it
1578 * is sufficient to remove a single prefixing underscore if
1581 /* The return value of this function (unlike cg_unescape())
1587 streq(p, "notify_on_release") ||
1588 streq(p, "release_agent") ||
1594 dot = strrchr(p, '.');
1597 if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0)
1602 n = strndupa(p, dot - p);
1604 if (check_hierarchy(n) >= 0)
1611 return strappend("_", p);
1616 char *cg_unescape(const char *p) {
1619 /* The return value of this function (unlike cg_escape())
1620 * doesn't need free()! */
1628 #define CONTROLLER_VALID \
1632 bool cg_controller_is_valid(const char *p) {
1638 s = startswith(p, "name=");
1642 if (*p == 0 || *p == '_')
1645 for (t = p; *t; t++)
1646 if (!strchr(CONTROLLER_VALID, *t))
1649 if (t - p > FILENAME_MAX)
1655 /// UNNEEDED by elogind
1657 int cg_slice_to_path(const char *unit, char **ret) {
1658 _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
1665 if (streq(unit, "-.slice")) {
1675 if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN))
1678 if (!endswith(unit, ".slice"))
1681 r = unit_name_to_prefix(unit, &p);
1685 dash = strchr(p, '-');
1687 /* Don't allow initial dashes */
1692 _cleanup_free_ char *escaped = NULL;
1693 char n[dash - p + sizeof(".slice")];
1695 /* Don't allow trailing or double dashes */
1696 if (dash[1] == 0 || dash[1] == '-')
1699 strcpy(stpncpy(n, p, dash - p), ".slice");
1700 if (!unit_name_is_valid(n, UNIT_NAME_PLAIN))
1703 escaped = cg_escape(n);
1707 if (!strextend(&s, escaped, "/", NULL))
1710 dash = strchr(dash+1, '-');
1713 e = cg_escape(unit);
1717 if (!strextend(&s, e, NULL))
1726 int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) {
1727 _cleanup_free_ char *p = NULL;
1730 r = cg_get_path(controller, path, attribute, &p);
1734 return write_string_file_no_create(p, value);
1737 int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) {
1738 _cleanup_free_ char *p = NULL;
1741 r = cg_get_path(controller, path, attribute, &p);
1745 return read_one_line_file(p, ret);
1749 static const char mask_names[] =
1756 /// UNNEEDED by elogind
1758 int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {
1759 CGroupControllerMask bit = 1;
1763 /* This one will create a cgroup in our private tree, but also
1764 * duplicate it in the trees specified in mask, and remove it
1767 /* First create the cgroup in our own hierarchy. */
1768 r = cg_create(ELOGIND_CGROUP_CONTROLLER, path);
1772 /* Then, do the same in the other hierarchies */
1773 NULSTR_FOREACH(n, mask_names) {
1776 else if (supported & bit)
1777 cg_trim(n, path, true);
1786 int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
1787 CGroupControllerMask bit = 1;
1791 r = cg_attach(ELOGIND_CGROUP_CONTROLLER, path, pid);
1795 NULSTR_FOREACH(n, mask_names) {
1797 if (supported & bit) {
1798 const char *p = NULL;
1801 p = path_callback(bit, userdata);
1806 cg_attach_fallback(n, p, pid);
1815 /// UNNEEDED by elogind
1817 int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
1822 SET_FOREACH(pidp, pids, i) {
1823 pid_t pid = PTR_TO_LONG(pidp);
1826 q = cg_attach_everywhere(supported, path, pid, path_callback, userdata);
1834 int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
1835 CGroupControllerMask bit = 1;
1839 if (!path_equal(from, to)) {
1840 r = cg_migrate_recursive(ELOGIND_CGROUP_CONTROLLER, from, ELOGIND_CGROUP_CONTROLLER, to, false, true);
1845 NULSTR_FOREACH(n, mask_names) {
1846 if (supported & bit) {
1847 const char *p = NULL;
1850 p = to_callback(bit, userdata);
1855 cg_migrate_recursive_fallback(ELOGIND_CGROUP_CONTROLLER, to, n, p, false, false);
1864 int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) {
1865 CGroupControllerMask bit = 1;
1869 r = cg_trim(ELOGIND_CGROUP_CONTROLLER, path, delete_root);
1873 NULSTR_FOREACH(n, mask_names) {
1874 if (supported & bit)
1875 cg_trim(n, path, delete_root);
1883 CGroupControllerMask cg_mask_supported(void) {
1884 CGroupControllerMask bit = 1, mask = 0;
1887 NULSTR_FOREACH(n, mask_names) {
1888 if (check_hierarchy(n) >= 0)
1897 int cg_kernel_controllers(Set *controllers) {
1898 _cleanup_fclose_ FILE *f = NULL;
1902 assert(controllers);
1904 f = fopen("/proc/cgroups", "re");
1906 if (errno == ENOENT)
1911 /* Ignore the header line */
1912 (void) fgets(buf, sizeof(buf), f);
1919 if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
1924 if (ferror(f) && errno)
1935 if (!filename_is_valid(controller)) {
1940 r = set_consume(controllers, controller);