Programming

#include	"myfile.h"

int
main(int argc, char **argv)
{
	int					sockfd, n;
	char				recvline[MAXLINE + 1];
	struct sockaddr_in	servaddr;

	if (argc != 2) {
		perror("usage: a.out <IPaddress>");
		exit (1);
	}


	if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		perror("socket error");
		exit(1);
	}

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port   = htons(SERV_PORT);	/* daytime server */
	if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0) {
		printf("inet_pton error for %s", argv[1]);
		exit(0);
	}

	if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0) {
		perror("connect error");
		exit(1);
	}

	while ( (n = read(sockfd, recvline, MAXLINE)) > 0) {
		recvline[n] = 0;	/* null terminate */
		if (fputs(recvline, stdout) == EOF) {
			perror("fputs error");
			exit(1);
		}
	}
	if (n < 0) {
		perror("read error");
	}

	exit(0);
}

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

int
main(int argc, char **argv)
{
	int					listenfd, connfd;
	struct sockaddr_in	servaddr;
	char				buff[MAXLINE];
	time_t				ticks;

	listenfd = socket(AF_INET, SOCK_STREAM, 0);
	if (listenfd < 0)
		exit(0);

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family      = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port        = htons(SERV_PORT);	/* daytime server */

	if (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0)
		exit(0);

	if( listen(listenfd, LISTENQ) <0)
		exit(0);

	for ( ; ; ) {
		connfd = accept(listenfd, (struct sockaddr *) NULL, NULL);
		if (connfd<0) {
			perror("connection failure");
			continue;
		}

        ticks = time(NULL);
        snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
        if( write(connfd, buff, strlen(buff)) < 0) {
		perror("error in writing");
	}

	close(connfd);
	}
}