Unix网络编程之socket编程（一）--socket入门简单程序

来源：互联网发布：白金数据电影编辑：程序博客网时间：2024/06/15 23:59

本程序实现客户端向服务器发送一个字符串，服务器将接收到的字符串回送给客户端。

// unp.h#ifndef _UNP_H#define _UNP_H#include <stdio.h>#include <string.h>#include <stdlib.h>#include <errno.h>#include <unistd.h>#include <sys/socket.h>#include <sys/types.h>#include <netinet/in.h>#include <arpa/inet.h>#include <assert.h>#define MAXLINE 4096#define ERR_EXIT(m) \do{ \perror(m); \exit(EXIT_FAILURE); \  }while(0)#endif

下面是客户端代码：

#include "unp.h"int main(){int sockfd;char sendbuff[MAXLINE];struct sockaddr_in servaddr;ssize_t n;if( (sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)ERR_EXIT("socket err");memset(&servaddr, 0, sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(6666);servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");if(connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)ERR_EXIT("connect err");for(; ;){fgets(sendbuff, MAXLINE, stdin);if( (n = write(sockfd, sendbuff, strlen(sendbuff))) < 0)ERR_EXIT("write err");memset(sendbuff, 0 ,sizeof(sendbuff));if( (n = read(sockfd, sendbuff, sizeof(sendbuff))) < 0)ERR_EXIT("read err");fputs(sendbuff, stdout);memset(sendbuff, 0, sizeof(sendbuff));}close(sockfd);}

下面是服务端代码：

#include "unp.h"int main(){int listenfd, connfd;struct sockaddr_in servaddr;char recvbuff[MAXLINE];ssize_t n;if( (listenfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)ERR_EXIT("socket err");memset(&servaddr, 0, sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(6666);servaddr.sin_addr.s_addr = INADDR_ANY;if(bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)ERR_EXIT("bind err");if(listen(listenfd, SOMAXCONN) < 0)ERR_EXIT("listen err");if( (connfd = accept(listenfd, (struct sockaddr*)NULL, NULL)) < 0)ERR_EXIT("accept err");for(; ;){if( (n = read(connfd, recvbuff, sizeof(recvbuff))) < 0)ERR_EXIT("read err");recvbuff[n] = '\0';fputs(recvbuff, stdout);if( (n = write(connfd, recvbuff, strlen(recvbuff))) < 0)ERR_EXIT("write err");memset(recvbuff, 0, sizeof(recvbuff));}close(connfd);close(listenfd);return 0;}

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