/*
TCP MultiProcess Echo Server
Author :Andrew Huang
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
static void process_fn(int client_fd)
{
int len;
char buf[1024];
while(1)
{
//第五步:与客户端在新的socket进行通讯
//注意,是从client_fd,
len = recv(client_fd,buf,sizeof(buf),0);
if(len <= 0)
break;
buf[len] = 0;
fprintf(stdout,"RECV(%d):\"%s\"\n",client_fd,buf);
//第六步:用send把数据照原样发给客户端
if(send(client_fd,buf,len,0)<=0)
break;
}
close(client_fd);
fprintf(stdout,"CLOSE socket %d\n",client_fd);
}
int main(int argc ,char * argv[])
{
unsigned short port = 9000;
int listen_fd ;
int client_fd;
pthread_t pth;
struct sockaddr_in addr; //ipv4的地址结构
struct sockaddr_in client_addr ;
socklen_t addr_len;
int len ;
if(argc >1)
{
port = (unsigned short)atoi(argv[1]);
}
//第一步:创建一个IPV4,TCP,可以运行所有协议的SOCKET
listen_fd = socket(PF_INET,SOCK_STREAM,0);
if(listen_fd == -1)
{
perror("socket");
return -1;
}
//第二步:用bind来指定端口
memset(&addr,0,sizeof(addr));
addr.sin_port = htons(port); //转成网络序的端口
addr.sin_family = AF_INET; //ipv4的地址类型
//addr.sin_addr.s_addr = inet_addr("0.0.0.0"); //bind 的sin_addr表示在哪一个网卡上有效,
//绑定在0.0.0.0上表示这个SOCKET在所有网卡侦听
addr.sin_addr.s_addr = INADDR_ANY; //INADDR_ANY = 0 = inet_addr("0.0.0.0")
if(bind(listen_fd,(const struct sockaddr *)&addr,sizeof(addr)) == -1)
{
perror("bind");
close(listen_fd);
return -2;
}
//第三步: 通知内核里的TCP/IP协议栈,让这个SOCKET开始侦听网络上的请求
// listen只是通知一下,通知成功立即执行后面代码
if(listen(listen_fd,20) == -1)
{
perror("listen");
close(listen_fd);
return -3;
}
fprintf(stdout,"TCP MultiProcess Echo Server listen on %d\n",port);
while(1)
{
memset(&client_addr,0,sizeof(client_addr));
client_addr.sin_family = AF_INET;
addr_len = sizeof(client_addr); //必须赋值!
//第四步:服务器在侦听客户端请求
printf("accept client ...\n");
client_fd = accept(listen_fd,(struct sockaddr *)&client_addr,&addr_len);
if(client_fd == -1)
{
perror("accept");
continue;
}
fprintf(stdout,"client socket %d,addr %s,port %d\n",client_fd,
inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));
// pthread_create(&pth,NULL,thread_fn,(void*)client_fd);
if(fork() == 0)
{//子进程负责处理对应联接
close(listen_fd);
process_fn(client_fd);
exit(0);
}
close(client_fd); //父进程关闭client_fd;
}
printf("exit");
close(listen_fd);
}
|