-int cg_pid_get_owner_uid(pid_t pid, uid_t *uid);
-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_machine_name(pid_t pid, char **machine);
-int cg_pid_get_slice(pid_t pid, char **slice);
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-int cg_path_decode_unit(const char *cgroup, char **unit);