int cg_split_spec(const char *spec, char **controller, char **path);
int cg_join_spec(const char *controller, const char *path, char **spec);
int cg_split_spec(const char *spec, char **controller, char **path);
int cg_join_spec(const char *controller, const char *path, char **spec);
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs);
int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs);
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs);
int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs);
int cg_trim(const char *controller, const char *path, bool delete_root);
int cg_rmdir(const char *controller, const char *path, bool honour_sticky);
int cg_delete(const char *controller, const char *path);
int cg_trim(const char *controller, const char *path, bool delete_root);
int cg_rmdir(const char *controller, const char *path, bool honour_sticky);
int cg_delete(const char *controller, const char *path);
int cg_attach(const char *controller, const char *path, pid_t pid);
int cg_create_and_attach(const char *controller, const char *path, pid_t pid);
int cg_attach(const char *controller, const char *path, pid_t pid);
int cg_create_and_attach(const char *controller, const char *path, pid_t pid);
int cg_is_empty_by_spec(const char *spec, bool ignore_self);
int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self);
int cg_is_empty_by_spec(const char *spec, bool ignore_self);
int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self);
int cg_path_get_unit(const char *path, char **unit);
int cg_path_get_user_unit(const char *path, char **unit);
int cg_path_get_unit(const char *path, char **unit);
int cg_path_get_user_unit(const char *path, char **unit);
int cg_pid_get_unit(pid_t pid, char **unit);
int cg_pid_get_user_unit(pid_t pid, char **unit);
int cg_pid_get_unit(pid_t pid, char **unit);
int cg_pid_get_user_unit(pid_t pid, char **unit);