daytimeudpsrv2.c

来自「Unix网络编程 基于Socket的网络编程」· C语言 代码 · 共 37 行

#include	"unpxti.h"
#include	<time.h>

int
main(int argc, char **argv)
{
	int					tfd, flags;
	char				buff[MAXLINE];
	time_t				ticks;
	struct t_unitdata	*tud;

	if (argc == 2)
		tfd = Udp_server(NULL, argv[1], NULL);
	else if (argc == 3)
		tfd = Udp_server(argv[1], argv[2], NULL);
	else
		err_quit("usage: daytimeudpsrv [ <host> ] <service or port>");

	tud = T_alloc(tfd, T_UNITDATA, T_ADDR);

	for ( ; ; ) {
		tud->udata.maxlen = MAXLINE;
		tud->udata.buf = buff;
		if (t_rcvudata(tfd, tud, &flags) == 0) {
			printf("datagram from %s\n", Xti_ntop(&tud->addr));
        	ticks = time(NULL);
        	snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
			tud->udata.len = strlen(buff);
        	T_sndudata(tfd, tud);

		} else if (t_errno == TLOOK)
			T_rcvuderr(tfd, NULL);	/* just clear error */
		else
			err_xti("t_rcvudata error");
	}
}