tcpcli01.c

linux下的聊天程序

#include <curses.h>
#include <netdb.h>
#include <stdio.h> 
#include <stdlib.h> 
#include <errno.h> 
#include <string.h> 
#include <sys/types.h> 
#include <netinet/in.h> 
#include <sys/socket.h> 
#include <sys/wait.h> 

#define SERV_PORT 9877 
#define LISTENQ 1024 
#define MAXLINE 4096 
#define SA struct sockaddr

void
str_cli(FILE *fp, int sockfd)
{
	char	sendline[MAXLINE], recvline[MAXLINE];

	while (fgets(sendline, MAXLINE, fp) != NULL) {

		writen(sockfd, sendline, strlen(sendline));

		if (readline(sockfd, recvline, MAXLINE) == 0)
			err_quit("str_cli: server terminated prematurely");

		fputs(recvline, stdout);
	}
}

int
main(int argc, char **argv)
{
	int	sockfd;
	struct sockaddr_in	servaddr;

	if (argc != 2)
		err_quit("usage: tcpcli <IPaddress>");

	sockfd = socket(AF_INET, SOCK_STREAM, 0);

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(SERV_PORT);
	inet_pton(AF_INET, argv[1], &servaddr.sin_addr);

	connect(sockfd, (SA *) &servaddr, sizeof(servaddr));

	str_cli(stdin, sockfd);		/* do it all */

	exit(0);
}