#include	"unpxti.h"intmain(int argc, char **argv){	int				listenfd, connfd, n, flags;	char			buff[MAXLINE];	struct pollfd	fds[1];	if (argc == 2)		listenfd = Tcp_listen(NULL, argv[1], NULL);	else if (argc == 3)		listenfd = Tcp_listen(argv[1], argv[2], NULL);	else		err_quit("usage: daytimetcpsrv01 [ <host> ] <service or port>");		connfd = Xti_accept(listenfd, NULL, 0);	fds[0].fd = connfd;	fds[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;	for ( ; ; ) {		n = poll(fds, 1, INFTIM);		printf("poll returned %d, revents = 0x%x\n", n, fds[0].revents);		n = T_rcv(connfd, buff, sizeof(buff), &flags);		printf("received %d bytes, flags = %d\n", n, flags);	}}