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//====================================================================================
// The information contained herein is the exclusive property of
// Sunnnorth Technology Co. And shall not be distributed, reproduced,
// or disclosed in whole in part without prior written permission.
// (C) COPYRIGHT 2003 SUNNORTH TECHNOLOGY CO.
// ALL RIGHTS RESERVED
// The entire notice above must be reproduced on all authorized copies.
//====================================================================================
//=============================================================
// 文件名称：tcp_echo_srv.c
// 功能描述：TCP Echo Server
// 维护记录：2009-032-29 V1.0
//=============================================================
#include <stdio.h>
#include <stdlib.h>
#include <string.h> // bzero
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h> // inet_ntop
//=============================================================
// 语法格式： void main(void)
// 实现功能： 主函数，建立一个TCP Echo Server
// 入口参数： 无
// 出口参数： 无
//=============================================================
int main(int argc, char *argv[])
{
char recvbuf[2048]; // 接收缓冲区
int sockfd; // 套接字
struct sockaddr_in servAddr; // 服务器地址结构体
unsigned short port = 8000; // 监听端口
if(argc > 1) // 由参数接收端口
{
port = atoi(argv[1]);
}
printf("TCP Server Started at port %d!\n", port);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
// 创建TCP套接字
if(sockfd < 0)
{
perror("Invalid socket");
exit(1);
}
bzero(&servAddr, sizeof(servAddr)); // 初始化服务器地址
servAddr.sin_family = AF_INET;
servAddr.sin_port = htons(port);
servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
printf("Binding server to port %d\n", port);
if(bind(sockfd, (struct sockaddr*)&servAddr, sizeof(struct sockaddr)) != 0)
{
close(sockfd);
perror("binding err!");
exit(1);
}
if(listen(sockfd, 1) != 0)
{
close(sockfd);
perror("listen err!");
exit(1);
}
printf("waiting client...\n");
while(1)
{
char cliIP[INET_ADDRSTRLEN]; // 用于保存客户端IP地址
size_t recvLen;
struct sockaddr_in cliAddr; // 用于保存客户端地址
size_t cliAddrLen = sizeof(cliAddr);
// 必须初始化!!!
int connfd = accept(sockfd, (struct sockaddr*)&cliAddr, &cliAddrLen);
// 获得一个已经建立的连接
if(connfd < 0)
{
close(sockfd);
perror("accept err!");
exit(1);
}
inet_ntop(AF_INET, &cliAddr.sin_addr.s_addr, cliIP, INET_ADDRSTRLEN);
printf("client ip = %s\n", cliIP);
while((recvLen = read(connfd, recvbuf, 2048)) > 0)
{
write(connfd, recvbuf, recvLen);
}
close(connfd);
printf("client closed!\n");
}
close(sockfd);
return 0;
}
：1、sockfd = socket(AF_INET, SOCK_STREAM, 0); // 创建TCP套接字
2、bzero(&servAddr, sizeof(servAddr)); // 初始化服务器地址
3、bind(sockfd, (struct sockaddr*)&servAddr, sizeof(struct sockaddr))
4、listen(sockfd, 1)
5、int connfd = accept(sockfd, (struct sockaddr*)&cliAddr, &cliAddrLen)
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