int cg_get_user_path(char **path);
int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup);
int cg_pid_get_unit(pid_t pid, char **unit);
int cg_get_user_path(char **path);
int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup);
int cg_pid_get_unit(pid_t pid, char **unit);