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-rw-r--r--src/shared/cgroup-util.c763
1 files changed, 495 insertions, 268 deletions
diff --git a/src/shared/cgroup-util.c b/src/shared/cgroup-util.c
index 43c415d760..8a4eddab7a 100644
--- a/src/shared/cgroup-util.c
+++ b/src/shared/cgroup-util.c
@@ -38,6 +38,8 @@
#include "strv.h"
#include "unit-name.h"
#include "fileio.h"
+#include "special.h"
+#include "mkdir.h"
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
_cleanup_free_ char *fs = NULL;
@@ -58,25 +60,6 @@ int cg_enumerate_processes(const char *controller, const char *path, FILE **_f)
return 0;
}
-int cg_enumerate_tasks(const char *controller, const char *path, FILE **_f) {
- _cleanup_free_ char *fs = NULL;
- FILE *f;
- int r;
-
- assert(_f);
-
- r = cg_get_path(controller, path, "tasks", &fs);
- if (r < 0)
- return r;
-
- f = fopen(fs, "re");
- if (!f)
- return -errno;
-
- *_f = f;
- return 0;
-}
-
int cg_read_pid(FILE *f, pid_t *_pid) {
unsigned long ul;
@@ -150,7 +133,7 @@ int cg_read_subgroup(DIR *d, char **fn) {
return 0;
}
-int cg_rmdir(const char *controller, const char *path, bool honour_sticky) {
+int cg_rmdir(const char *controller, const char *path) {
_cleanup_free_ char *p = NULL;
int r;
@@ -158,22 +141,6 @@ int cg_rmdir(const char *controller, const char *path, bool honour_sticky) {
if (r < 0)
return r;
- if (honour_sticky) {
- char *tasks;
-
- /* If the sticky bit is set don't remove the directory */
-
- tasks = strappend(p, "/tasks");
- if (!tasks)
- return -ENOMEM;
-
- r = file_is_priv_sticky(tasks);
- free(tasks);
-
- if (r > 0)
- return 0;
- }
-
r = rmdir(p);
if (r < 0 && errno != ENOENT)
return -errno;
@@ -304,7 +271,7 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool si
ret = r;
if (rem) {
- r = cg_rmdir(controller, path, true);
+ r = cg_rmdir(controller, path);
if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
return r;
}
@@ -365,7 +332,7 @@ int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char
pid_t pid = 0;
done = true;
- r = cg_enumerate_tasks(cfrom, pfrom, &f);
+ r = cg_enumerate_processes(cfrom, pfrom, &f);
if (r < 0) {
if (ret >= 0 && r != -ENOENT)
return r;
@@ -413,7 +380,14 @@ int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char
return ret;
}
-int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self, bool rem) {
+int cg_migrate_recursive(
+ const char *cfrom,
+ const char *pfrom,
+ const char *cto,
+ const char *pto,
+ bool ignore_self,
+ bool rem) {
+
_cleanup_closedir_ DIR *d = NULL;
int r, ret = 0;
char *fn;
@@ -454,7 +428,7 @@ int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto,
ret = r;
if (rem) {
- r = cg_rmdir(cfrom, pfrom, true);
+ r = cg_rmdir(cfrom, pfrom);
if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
return r;
}
@@ -462,6 +436,37 @@ int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto,
return ret;
}
+int cg_migrate_recursive_fallback(
+ const char *cfrom,
+ const char *pfrom,
+ const char *cto,
+ const char *pto,
+ bool ignore_self,
+ bool rem) {
+
+ int r;
+
+ assert(cfrom);
+ assert(pfrom);
+ assert(cto);
+ assert(pto);
+
+ r = cg_migrate_recursive(cfrom, pfrom, cto, pto, ignore_self, rem);
+ if (r < 0) {
+ char prefix[strlen(pto) + 1];
+
+ /* This didn't work? Then let's try all prefixes of the destination */
+
+ PATH_FOREACH_PREFIX(prefix, pto) {
+ r = cg_migrate_recursive(cfrom, pfrom, cto, prefix, ignore_self, rem);
+ if (r >= 0)
+ break;
+ }
+ }
+
+ return 0;
+}
+
static const char *normalize_controller(const char *controller) {
assert(controller);
@@ -477,19 +482,19 @@ static const char *normalize_controller(const char *controller) {
static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
char *t = NULL;
- if (controller) {
- if (path && suffix)
+ if (!isempty(controller)) {
+ if (!isempty(path) && !isempty(suffix))
t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
- else if (path)
+ else if (!isempty(path))
t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
- else if (suffix)
+ else if (!isempty(suffix))
t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
else
t = strappend("/sys/fs/cgroup/", controller);
} else {
- if (path && suffix)
+ if (!isempty(path) && !isempty(suffix))
t = strjoin(path, "/", suffix, NULL);
- else if (path)
+ else if (!isempty(path))
t = strdup(path);
else
return -EINVAL;
@@ -564,8 +569,9 @@ int cg_get_path_and_check(const char *controller, const char *path, const char *
}
static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
- char *p;
- bool is_sticky;
+ assert(path);
+ assert(sb);
+ assert(ftwbuf);
if (typeflag != FTW_DP)
return 0;
@@ -573,18 +579,6 @@ static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct
if (ftwbuf->level < 1)
return 0;
- p = strappend(path, "/tasks");
- if (!p) {
- errno = ENOMEM;
- return 1;
- }
-
- is_sticky = file_is_priv_sticky(p) > 0;
- free(p);
-
- if (is_sticky)
- return 0;
-
rmdir(path);
return 0;
}
@@ -604,19 +598,8 @@ int cg_trim(const char *controller, const char *path, bool delete_root) {
r = errno ? -errno : -EIO;
if (delete_root) {
- bool is_sticky;
- char *p;
-
- p = strappend(fs, "/tasks");
- if (!p)
- return -ENOMEM;
-
- is_sticky = file_is_priv_sticky(p) > 0;
- free(p);
-
- if (!is_sticky)
- if (rmdir(fs) < 0 && errno != ENOENT && r == 0)
- return -errno;
+ if (rmdir(fs) < 0 && errno != ENOENT)
+ return -errno;
}
return r;
@@ -636,6 +619,46 @@ int cg_delete(const char *controller, const char *path) {
return r == -ENOENT ? 0 : r;
}
+int cg_create(const char *controller, const char *path) {
+ _cleanup_free_ char *fs = NULL;
+ int r;
+
+ r = cg_get_path_and_check(controller, path, NULL, &fs);
+ if (r < 0)
+ return r;
+
+ r = mkdir_parents(fs, 0755);
+ if (r < 0)
+ return r;
+
+ if (mkdir(fs, 0755) < 0) {
+
+ if (errno == EEXIST)
+ return 0;
+
+ return -errno;
+ }
+
+ return 1;
+}
+
+int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
+ int r, q;
+
+ assert(pid >= 0);
+
+ r = cg_create(controller, path);
+ if (r < 0)
+ return r;
+
+ q = cg_attach(controller, path, pid);
+ if (q < 0)
+ return q;
+
+ /* This does not remove the cgroup on failure */
+ return r;
+}
+
int cg_attach(const char *controller, const char *path, pid_t pid) {
_cleanup_free_ char *fs = NULL;
char c[DECIMAL_STR_MAX(pid_t) + 2];
@@ -644,7 +667,7 @@ int cg_attach(const char *controller, const char *path, pid_t pid) {
assert(path);
assert(pid >= 0);
- r = cg_get_path_and_check(controller, path, "tasks", &fs);
+ r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs);
if (r < 0)
return r;
@@ -656,6 +679,30 @@ int cg_attach(const char *controller, const char *path, pid_t pid) {
return write_string_file(fs, c);
}
+int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
+ int r;
+
+ assert(controller);
+ assert(path);
+ assert(pid >= 0);
+
+ r = cg_attach(controller, path, pid);
+ if (r < 0) {
+ char prefix[strlen(path) + 1];
+
+ /* This didn't work? Then let's try all prefixes of
+ * the destination */
+
+ PATH_FOREACH_PREFIX(prefix, path) {
+ r = cg_attach(controller, prefix, pid);
+ if (r >= 0)
+ break;
+ }
+ }
+
+ return 0;
+}
+
int cg_set_group_access(
const char *controller,
const char *path,
@@ -683,52 +730,30 @@ int cg_set_task_access(
const char *path,
mode_t mode,
uid_t uid,
- gid_t gid,
- int sticky) {
+ gid_t gid) {
_cleanup_free_ char *fs = NULL, *procs = NULL;
int r;
assert(path);
- if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1 && sticky < 0)
+ if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1)
return 0;
if (mode != (mode_t) -1)
mode &= 0666;
- r = cg_get_path(controller, path, "tasks", &fs);
+ r = cg_get_path(controller, path, "cgroup.procs", &fs);
if (r < 0)
return r;
- if (sticky >= 0 && mode != (mode_t) -1)
- /* Both mode and sticky param are passed */
- mode |= (sticky ? S_ISVTX : 0);
- else if ((sticky >= 0 && mode == (mode_t) -1) ||
- (mode != (mode_t) -1 && sticky < 0)) {
- struct stat st;
-
- /* Only one param is passed, hence read the current
- * mode from the file itself */
-
- r = lstat(fs, &st);
- if (r < 0)
- return -errno;
-
- if (mode == (mode_t) -1)
- /* No mode set, we just shall set the sticky bit */
- mode = (st.st_mode & ~S_ISVTX) | (sticky ? S_ISVTX : 0);
- else
- /* Only mode set, leave sticky bit untouched */
- mode = (st.st_mode & ~0777) | mode;
- }
-
r = chmod_and_chown(fs, mode, uid, gid);
if (r < 0)
return r;
- /* Always keep values for "cgroup.procs" in sync with "tasks" */
- r = cg_get_path(controller, path, "cgroup.procs", &procs);
+ /* Compatibility, Always keep values for "tasks" in sync with
+ * "cgroup.procs" */
+ r = cg_get_path(controller, path, "tasks", &procs);
if (r < 0)
return r;
@@ -861,6 +886,32 @@ int cg_install_release_agent(const char *controller, const char *agent) {
return 0;
}
+int cg_uninstall_release_agent(const char *controller) {
+ _cleanup_free_ char *fs = NULL;
+ int r;
+
+ r = cg_get_path(controller, NULL, "notify_on_release", &fs);
+ if (r < 0)
+ return r;
+
+ r = write_string_file(fs, "0");
+ if (r < 0)
+ return r;
+
+ free(fs);
+ fs = NULL;
+
+ r = cg_get_path(controller, NULL, "release_agent", &fs);
+ if (r < 0)
+ return r;
+
+ r = write_string_file(fs, "");
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
_cleanup_fclose_ FILE *f = NULL;
pid_t pid = 0, self_pid;
@@ -869,7 +920,7 @@ int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
assert(path);
- r = cg_enumerate_tasks(controller, path, &f);
+ r = cg_enumerate_processes(controller, path, &f);
if (r < 0)
return r == -ENOENT ? 1 : r;
@@ -993,19 +1044,28 @@ int cg_split_spec(const char *spec, char **controller, char **path) {
return -EINVAL;
}
- u = strdup(e+1);
- if (!u) {
- free(t);
- return -ENOMEM;
- }
- if (!path_is_safe(u) ||
- !path_is_absolute(u)) {
- free(t);
- free(u);
- return -EINVAL;
- }
+ if (streq(e+1, "")) {
+ u = strdup("/");
+ if (!u) {
+ free(t);
+ return -ENOMEM;
+ }
+ } else {
+ u = strdup(e+1);
+ if (!u) {
+ free(t);
+ return -ENOMEM;
+ }
+
+ if (!path_is_safe(u) ||
+ !path_is_absolute(u)) {
+ free(t);
+ free(u);
+ return -EINVAL;
+ }
- path_kill_slashes(u);
+ path_kill_slashes(u);
+ }
if (controller)
*controller = t;
@@ -1075,96 +1135,20 @@ int cg_mangle_path(const char *path, char **result) {
return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
}
-int cg_get_system_path(char **path) {
- char *p;
- int r;
-
- assert(path);
-
- r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
- if (r < 0) {
- p = strdup("/system");
- if (!p)
- return -ENOMEM;
- }
-
- if (endswith(p, "/system"))
- *path = p;
- else {
- char *q;
-
- q = strappend(p, "/system");
- free(p);
- if (!q)
- return -ENOMEM;
-
- *path = q;
- }
-
- return 0;
-}
-
int cg_get_root_path(char **path) {
- char *root, *e;
+ char *p, *e;
int r;
assert(path);
- r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &root);
+ r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
if (r < 0)
return r;
- e = endswith(root, "/system");
- if (e == root)
- e[1] = 0;
- else if (e)
+ e = endswith(p, "/" SPECIAL_SYSTEM_SLICE);
+ if (e)
*e = 0;
- *path = root;
- return 0;
-}
-
-int cg_get_user_path(char **path) {
- _cleanup_free_ char *root = NULL;
- char *p;
-
- assert(path);
-
- /* Figure out the place to put user cgroups below. We use the
- * same as PID 1 has but with the "/system" suffix replaced by
- * "/user" */
-
- if (cg_get_root_path(&root) < 0 || streq(root, "/"))
- p = strdup("/user");
- else
- p = strappend(root, "/user");
-
- if (!p)
- return -ENOMEM;
-
- *path = p;
- return 0;
-}
-
-int cg_get_machine_path(const char *machine, char **path) {
- _cleanup_free_ char *root = NULL, *escaped = NULL;
- char *p;
-
- assert(path);
-
- if (machine) {
- const char *name = strappenda(machine, ".nspawn");
-
- escaped = cg_escape(name);
- if (!escaped)
- return -ENOMEM;
- }
-
- p = strjoin(cg_get_root_path(&root) >= 0 && !streq(root, "/") ? root : "",
- "/machine", machine ? "/" : "", machine ? escaped : "", NULL);
- if (!p)
- return -ENOMEM;
-
*path = p;
return 0;
}
@@ -1247,7 +1231,7 @@ int cg_pid_get_path_shifted(pid_t pid, char **root, char **cgroup) {
}
int cg_path_decode_unit(const char *cgroup, char **unit){
- char *p, *e, *c, *s, *k;
+ char *e, *c, *s;
assert(cgroup);
assert(unit);
@@ -1256,33 +1240,31 @@ int cg_path_decode_unit(const char *cgroup, char **unit){
c = strndupa(cgroup, e - cgroup);
c = cg_unescape(c);
- /* Could this be a valid unit name? */
- if (!unit_name_is_valid(c, true))
+ if (!unit_name_is_valid(c, false))
return -EINVAL;
- if (!unit_name_is_template(c))
- s = strdup(c);
- else {
- if (*e != '/')
- return -EINVAL;
+ s = strdup(c);
+ if (!s)
+ return -ENOMEM;
- e += strspn(e, "/");
+ *unit = s;
+ return 0;
+}
- p = strchrnul(e, '/');
- k = strndupa(e, p - e);
- k = cg_unescape(k);
+static const char *skip_slices(const char *p) {
+ /* Skips over all slice assignments */
- if (!unit_name_is_valid(k, false))
- return -EINVAL;
+ for (;;) {
+ size_t n;
- s = strdup(k);
- }
+ p += strspn(p, "/");
- if (!s)
- return -ENOMEM;
+ n = strcspn(p, "/");
+ if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0)
+ return p;
- *unit = s;
- return 0;
+ p += n;
+ }
}
int cg_path_get_unit(const char *path, char **unit) {
@@ -1291,9 +1273,7 @@ int cg_path_get_unit(const char *path, char **unit) {
assert(path);
assert(unit);
- e = path_startswith(path, "/system/");
- if (!e)
- return -ENOENT;
+ e = skip_slices(path);
return cg_path_decode_unit(e, unit);
}
@@ -1311,15 +1291,21 @@ int cg_pid_get_unit(pid_t pid, char **unit) {
return cg_path_get_unit(cgroup, unit);
}
-_pure_ static const char *skip_label(const char *e) {
- assert(e);
+static const char *skip_session(const char *p) {
+ size_t n;
- e = strchr(e, '/');
- if (!e)
+ assert(p);
+
+ p += strspn(p, "/");
+
+ n = strcspn(p, "/");
+ if (n <= 12 || memcmp(p, "session-", 8) != 0 || memcmp(p + n - 6, ".scope", 6) != 0)
return NULL;
- e += strspn(e, "/");
- return e;
+ p += n;
+ p += strspn(p, "/");
+
+ return p;
}
int cg_path_get_user_unit(const char *path, char **unit) {
@@ -1332,24 +1318,16 @@ int cg_path_get_user_unit(const char *path, char **unit) {
* cgroups might have arbitrary child cgroups and we shouldn't get
* confused by those */
- e = path_startswith(path, "/user/");
- if (!e)
- return -ENOENT;
-
- /* Skip the user name */
- e = skip_label(e);
- if (!e)
- return -ENOENT;
+ /* Skip slices, if there are any */
+ e = skip_slices(path);
- /* Skip the session ID */
- e = skip_label(e);
+ /* Skip the session scope, require that there is one */
+ e = skip_session(e);
if (!e)
return -ENOENT;
- /* Skip the systemd cgroup */
- e = skip_label(e);
- if (!e)
- return -ENOENT;
+ /* And skip more slices */
+ e = skip_slices(e);
return cg_path_decode_unit(e, unit);
}
@@ -1368,23 +1346,34 @@ int cg_pid_get_user_unit(pid_t pid, char **unit) {
}
int cg_path_get_machine_name(const char *path, char **machine) {
- const char *e, *n;
+ const char *e, *n, *x;
char *s, *r;
+ size_t l;
assert(path);
assert(machine);
- e = path_startswith(path, "/machine/");
- if (!e)
- return -ENOENT;
+ /* Skip slices, if there are any */
+ e = skip_slices(path);
n = strchrnul(e, '/');
if (e == n)
return -ENOENT;
s = strndupa(e, n - e);
+ s = cg_unescape(s);
+
+ x = startswith(s, "machine-");
+ if (!x)
+ return -ENOENT;
+ if (!endswith(x, ".scope"))
+ return -ENOENT;
+
+ l = strlen(x);
+ if (l <= 6)
+ return -ENOENT;
- r = strdup(cg_unescape(s));
+ r = strndup(x, l - 6);
if (!r)
return -ENOMEM;
@@ -1406,32 +1395,38 @@ int cg_pid_get_machine_name(pid_t pid, char **machine) {
}
int cg_path_get_session(const char *path, char **session) {
- const char *e, *n;
- char *s;
+ const char *e, *n, *x;
+ char *s, *r;
+ size_t l;
assert(path);
assert(session);
- e = path_startswith(path, "/user/");
- if (!e)
- return -ENOENT;
+ /* Skip slices, if there are any */
+ e = skip_slices(path);
- /* Skip the user name */
- e = skip_label(e);
- if (!e)
+ n = strchrnul(e, '/');
+ if (e == n)
return -ENOENT;
- n = strchrnul(e, '/');
- if (n - e < 8)
+ s = strndupa(e, n - e);
+ s = cg_unescape(s);
+
+ x = startswith(s, "session-");
+ if (!x)
return -ENOENT;
- if (memcmp(n - 8, ".session", 8) != 0)
+ if (!endswith(x, ".scope"))
return -ENOENT;
- s = strndup(e, n - e - 8);
- if (!s)
+ l = strlen(x);
+ if (l <= 6)
+ return -ENOENT;
+
+ r = strndup(x, l - 6);
+ if (!r)
return -ENOMEM;
- *session = s;
+ *session = r;
return 0;
}
@@ -1449,23 +1444,25 @@ int cg_pid_get_session(pid_t pid, char **session) {
}
int cg_path_get_owner_uid(const char *path, uid_t *uid) {
- const char *e, *n;
+ _cleanup_free_ char *slice = NULL;
+ const char *e;
char *s;
+ int r;
assert(path);
assert(uid);
- e = path_startswith(path, "/user/");
- if (!e)
- return -ENOENT;
+ r = cg_path_get_slice(path, &slice);
+ if (r < 0)
+ return r;
- n = strchrnul(e, '/');
- if (n - e < 5)
+ e = startswith(slice, "user-");
+ if (!e)
return -ENOENT;
- if (memcmp(n - 5, ".user", 5) != 0)
+ if (!endswith(slice, ".slice"))
return -ENOENT;
- s = strndupa(e, n - e - 5);
+ s = strndupa(e, strlen(e) - 6);
if (!s)
return -ENOMEM;
@@ -1485,6 +1482,53 @@ int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
return cg_path_get_owner_uid(cgroup, uid);
}
+int cg_path_get_slice(const char *p, char **slice) {
+ const char *e = NULL;
+ size_t m = 0;
+
+ assert(p);
+ assert(slice);
+
+ for (;;) {
+ size_t n;
+
+ p += strspn(p, "/");
+
+ n = strcspn(p, "/");
+ if (n <= 6 || memcmp(p + n - 6, ".slice", 6) != 0) {
+ char *s;
+
+ if (!e)
+ return -ENOENT;
+
+ s = strndup(e, m);
+ if (!s)
+ return -ENOMEM;
+
+ *slice = s;
+ return 0;
+ }
+
+ e = p;
+ m = n;
+
+ p += n;
+ }
+}
+
+int cg_pid_get_slice(pid_t pid, char **slice) {
+ _cleanup_free_ char *cgroup = NULL;
+ int r;
+
+ assert(slice);
+
+ r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
+ if (r < 0)
+ return r;
+
+ return cg_path_get_slice(cgroup, slice);
+}
+
int cg_controller_from_attr(const char *attr, char **controller) {
const char *dot;
char *c;
@@ -1572,9 +1616,7 @@ char *cg_unescape(const char *p) {
}
#define CONTROLLER_VALID \
- "0123456789" \
- "abcdefghijklmnopqrstuvwxyz" \
- "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+ DIGITS LETTERS \
"_"
bool cg_controller_is_valid(const char *p, bool allow_named) {
@@ -1601,3 +1643,188 @@ bool cg_controller_is_valid(const char *p, bool allow_named) {
return true;
}
+
+int cg_slice_to_path(const char *unit, char **ret) {
+ _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
+ const char *dash;
+
+ assert(unit);
+ assert(ret);
+
+ if (!unit_name_is_valid(unit, false))
+ return -EINVAL;
+
+ if (!endswith(unit, ".slice"))
+ return -EINVAL;
+
+ p = unit_name_to_prefix(unit);
+ if (!p)
+ return -ENOMEM;
+
+ dash = strchr(p, '-');
+ while (dash) {
+ _cleanup_free_ char *escaped = NULL;
+ char n[dash - p + sizeof(".slice")];
+
+ strcpy(stpncpy(n, p, dash - p), ".slice");
+
+ if (!unit_name_is_valid(n, false))
+ return -EINVAL;
+
+ escaped = cg_escape(n);
+ if (!escaped)
+ return -ENOMEM;
+
+ if (!strextend(&s, escaped, "/", NULL))
+ return -ENOMEM;
+
+ dash = strchr(dash+1, '-');
+ }
+
+ e = cg_escape(unit);
+ if (!e)
+ return -ENOMEM;
+
+ if (!strextend(&s, e, NULL))
+ return -ENOMEM;
+
+ *ret = s;
+ s = NULL;
+
+ return 0;
+}
+
+int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ r = cg_get_path(controller, path, attribute, &p);
+ if (r < 0)
+ return r;
+
+ return write_string_file(p, value);
+}
+
+static const char mask_names[] =
+ "cpu\0"
+ "cpuacct\0"
+ "blkio\0"
+ "memory\0"
+ "devices\0";
+
+int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {
+ CGroupControllerMask bit = 1;
+ const char *n;
+ int r;
+
+ /* This one will create a cgroup in our private tree, but also
+ * duplicate it in the trees specified in mask, and remove it
+ * in all others */
+
+ /* First create the cgroup in our own hierarchy. */
+ r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
+ if (r < 0)
+ return r;
+
+ /* Then, do the same in the other hierarchies */
+ NULSTR_FOREACH(n, mask_names) {
+ if (mask & bit)
+ cg_create(n, path);
+ else if (supported & bit)
+ cg_trim(n, path, true);
+
+ bit <<= 1;
+ }
+
+ return 0;
+}
+
+int cg_attach_everywhere(CGroupControllerMask supported, const char *path, pid_t pid) {
+ CGroupControllerMask bit = 1;
+ const char *n;
+ int r;
+
+ r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
+ if (r < 0)
+ return r;
+
+ NULSTR_FOREACH(n, mask_names) {
+ if (supported & bit)
+ cg_attach_fallback(n, path, pid);
+
+ bit <<= 1;
+ }
+
+ return 0;
+}
+
+int cg_attach_many_everywhere(CGroupControllerMask supported, const char *path, Set* pids) {
+ Iterator i;
+ void *pidp;
+ int r = 0;
+
+ SET_FOREACH(pidp, pids, i) {
+ pid_t pid = PTR_TO_LONG(pidp);
+ int q;
+
+ q = cg_attach_everywhere(supported, path, pid);
+ if (q < 0)
+ r = q;
+ }
+
+ return r;
+}
+
+int cg_migrate_everywhere(CGroupControllerMask supported, const char *from, const char *to) {
+ CGroupControllerMask bit = 1;
+ const char *n;
+ int r;
+
+ if (!path_equal(from, to)) {
+ r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
+ if (r < 0)
+ return r;
+ }
+
+ NULSTR_FOREACH(n, mask_names) {
+ if (supported & bit)
+ cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, n, to, false, false);
+
+ bit <<= 1;
+ }
+
+ return 0;
+}
+
+int cg_trim_everywhere(CGroupControllerMask supported, const char *path, bool delete_root) {
+ CGroupControllerMask bit = 1;
+ const char *n;
+ int r;
+
+ r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
+ if (r < 0)
+ return r;
+
+ NULSTR_FOREACH(n, mask_names) {
+ if (supported & bit)
+ cg_trim(n, path, delete_root);
+
+ bit <<= 1;
+ }
+
+ return 0;
+}
+
+CGroupControllerMask cg_mask_supported(void) {
+ CGroupControllerMask bit = 1, mask = 0;
+ const char *n;
+
+ NULSTR_FOREACH(n, mask_names) {
+ if (check_hierarchy(n) >= 0)
+ mask |= bit;
+
+ bit <<= 1;
+ }
+
+ return mask;
+}
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