auth_unix
call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
struct auth_unix rpc_unix;
send_head -= sizeof(struct auth_unix);
(void)memset(send_head, 0, sizeof(struct auth_unix));
auth->authlen = htonl(sizeof(struct auth_unix));
call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
struct auth_unix rpc_unix;