/*****************************************
*TCP服务器端步骤：
*创建套接字 socket()
*绑定套接字 bind() ------> listen()
*设置套接字为监听模式，进入被动接受连接请求状态
*接受请求，建立连接 recv()
读写数据 send()
*终止连接 close()
******************************************/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <time.h>
#define SERVPORT 8000
#define BUFSIZE 1000
void tim_now(void)
{
time_t now;
struct tm *timenow;
time(&now);
timenow=localtime(&now);
printf("%s\n",asctime(timenow));
}
int main (int argc, char *argv[])
{ int ret,on;
int s;
int fd;
int len;
struct sockaddr_in my_addr;
struct sockaddr_in remote_addr;
int sin_size;
char buf[BUFSIZE],sent_buf[BUFSIZE];
memset (&my_addr, 0, sizeof (my_addr));
my_addr.sin_family = AF_INET; my_addr.sin_addr.s_addr = INADDR_ANY;
my_addr.sin_port = htons (SERVPORT );
on=1;
ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on) ); if ((s = socket (PF_INET, SOCK_STREAM, 0)) ==-1 )
{
perror ("socket");
exit(1);
}
if ((ret=bind (s, (struct sockaddr *) &my_addr, sizeof (struct sockaddr))) ==-1 )
{
perror ("bind");
exit(1);
}
listen (s, 5);
printf("listen...\n");
sin_size = sizeof (struct sockaddr_in);
if ((fd = accept (s, (struct sockaddr *) &remote_addr, &sin_size)) ==-1)
{
perror ("accept");
exit(1);
}
printf ("accept client %s\n", inet_ntoa (remote_addr.sin_addr));
tim_now();
len = send (fd, "Welcome to chat room\n", 21, 0);
while ((len = recv (fd, buf, BUFSIZE, 0)) > 0)
