so_rgid           115 kern/uipc_socket.c 	so->so_rgid = p->p_cred->p_rgid;
so_rgid           176 kern/uipc_socket2.c 	so->so_rgid = head->so_rgid;
so_rgid           109 sys/socketvar.h 	gid_t	so_egid, so_rgid;