+
+char *cg_escape(const char *p) {
+ bool need_prefix = false;
+
+ /* This implements very minimal escaping for names to be used
+ * as file names in the cgroup tree: any name which might
+ * conflict with a kernel name or is prefixed with '_' is
+ * prefixed with a '_'. That way, when reading cgroup names it
+ * is sufficient to remove a single prefixing underscore if
+ * there is one. */
+
+ /* The return value of this function (unlike cg_unescape())
+ * needs free()! */
+
+ if (p[0] == 0 ||
+ p[0] == '_' ||
+ p[0] == '.' ||
+ streq(p, "notify_on_release") ||
+ streq(p, "release_agent") ||
+ streq(p, "tasks"))
+ need_prefix = true;
+ else {
+ const char *dot;
+
+ dot = strrchr(p, '.');
+ if (dot) {
+
+ if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0)
+ need_prefix = true;
+ else {
+ char *n;
+
+ n = strndupa(p, dot - p);
+
+ if (check_hierarchy(n) >= 0)
+ need_prefix = true;
+ }
+ }
+ }
+
+ if (need_prefix)
+ return strappend("_", p);
+ else
+ return strdup(p);
+}
+
+char *cg_unescape(const char *p) {
+ assert(p);
+
+ /* The return value of this function (unlike cg_escape())
+ * doesn't need free()! */
+
+ if (p[0] == '_')
+ return (char*) p+1;
+
+ return (char*) p;
+}
+
+#define CONTROLLER_VALID \
+ "0123456789" \
+ "abcdefghijklmnopqrstuvwxyz" \
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+ "_"
+
+bool cg_controller_is_valid(const char *p, bool allow_named) {
+ const char *t, *s;
+
+ if (!p)
+ return false;
+
+ if (allow_named) {
+ s = startswith(p, "name=");
+ if (s)
+ p = s;
+ }
+
+ if (*p == 0 || *p == '_')
+ return false;
+
+ for (t = p; *t; t++)
+ if (!strchr(CONTROLLER_VALID, *t))
+ return false;
+
+ if (t - p > FILENAME_MAX)
+ return false;
+
+ 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_with_mask(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 (bit & mask)
+ cg_create(n, path);
+ else
+ cg_trim(n, path, true);
+
+ bit <<= 1;
+ }
+
+ return r;
+}
+
+int cg_attach_with_mask(CGroupControllerMask mask, const char *path, pid_t pid) {
+ CGroupControllerMask bit = 1;
+ const char *n;
+ int r;
+
+ r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
+
+ NULSTR_FOREACH(n, mask_names) {
+ if (bit & mask)
+ cg_attach(n, path, pid);
+ else {
+ char prefix[strlen(path) + 1], *slash;
+
+ /* OK, this one is a bit harder... Now we need
+ * to add to the closest parent cgroup we
+ * can find */
+ strcpy(prefix, path);
+ while ((slash = strrchr(prefix, '/'))) {
+ int q;
+ *slash = 0;
+
+ q = cg_attach(n, prefix, pid);
+ if (q >= 0)
+ break;
+ }
+ }
+
+ bit <<= 1;
+ }
+
+ return r;
+}
+
+int cg_attach_many_with_mask(CGroupControllerMask mask, 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 k;
+
+ k = cg_attach_with_mask(mask, path, pid);
+ if (k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+int cg_migrate_with_mask(CGroupControllerMask mask, const char *from, const char *to) {
+ CGroupControllerMask bit = 1;
+ const char *n;
+ int r;
+
+ if (path_equal(from, to))
+ return 0;
+
+ r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
+
+ NULSTR_FOREACH(n, mask_names) {
+ if (bit & mask)
+ cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, to, n, to, false, false);
+ else {
+ char prefix[strlen(to) + 1], *slash;
+
+ strcpy(prefix, to);
+ while ((slash = strrchr(prefix, '/'))) {
+ int q;
+
+ *slash = 0;
+
+ q = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, to, n, prefix, false, false);
+ if (q >= 0)
+ break;
+ }
+ }
+
+ bit <<= 1;
+ }
+
+ return r;
+}
+
+int cg_trim_with_mask(CGroupControllerMask mask, 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 (bit & mask)
+ cg_trim(n, path, delete_root);
+
+ bit <<= 1;
+ }
+
+ return r;
+}
+
+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;
+}