daytimetcpsrv4.c

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

int
main(int argc, char **argv)
{
	int				listenfd, connfd;
	socklen_t		addrlen, len;
	struct sockaddr	*cliaddr;
	char			buff[MAXLINE], host[NI_MAXHOST], serv[NI_MAXSERV];
	time_t			ticks;

	if (argc == 2)
		listenfd = Tcp_listen(NULL, argv[1], &addrlen);
	else if (argc == 3)
		listenfd = Tcp_listen(argv[1], argv[2], &addrlen);
	else
		err_quit("usage: daytimetcpsrv4 [ <host> ] <service or port>");

	cliaddr = Malloc(addrlen);

	for ( ; ; ) {
		len = addrlen;
		connfd = Accept(listenfd, cliaddr, &len);
		if (getnameinfo(cliaddr, len, host, NI_MAXHOST, serv, NI_MAXSERV,
						NI_NUMERICHOST | NI_NUMERICSERV) == 0)
			printf("connection from %s.%s\n", host, serv);

        ticks = time(NULL);
        snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
        Write(connfd, buff, strlen(buff));

		Close(connfd);
	}
}