linux下面的tcp编程

来源：互联网发布：centos 用户管理编辑：程序博客网时间：2024/06/06 01:37

首先要建立服务器建立起socket，然后与本地的端口进行绑定，接着就开始接收客户端的请求并建立与它的连接，接下来，客户端发送的消息。

tcpserver.c代码：

int main(){struct sockaddr_in server_sockaddr,client_sockaddr;int sin_size,recvbytes;int sockfd, client_fd;char buf[BUFFER_SIZE];/* 建立socket连接 */if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1){perror("socket");exit(1);}printf("Socket id = %d\n",sockfd);/* 设置socket_in 结构体中相关的参数 */server_sockaddr.sin_family = AF_INET;               /* ipv4的协议 */server_sockaddr.sin_port = htons(PORT);             /* 设置端口 */server_sockaddr.sin_addr.s_addr = INADDR_ANY;       /* ip地址服务器这边的地址 */bzero(&(server_sockaddr.sin_zero),8);               /* 保持位数 */int i = 1; /* 允许重复使用本地地址与套接字进行绑定 */setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR, &i,sizeof(i));/* 绑定函数bind（） */if(bind(sockfd,(struct sockaddr *)&server_sockaddr,sizeof(struct sockaddr))== -1){perror("bind");exit(1);}printf("bind success!\n");/* 调用listen（）函数，创建未处理请求的队列 */if( listen(sockfd, MAX_QUE_CONN_NM) == -1){perror("listen");exit(1);}printf("Listening....\n");/* 调用accept（）function,waiting client connnectting */if((client_fd = accept(sockfd, (struct sockaddr *) & client_sockaddr,&sin_size)) == -1){perror("accept");exit(1);}memset(buf,0,sizeof(buf));if((recvbytes = recv(client_fd,buf,BUFFER_SIZE,0)) == -1){perror("recv");exit(1);}printf("Received a message :%s\n",buf);close(sockfd);exit(0);}

客户端的程序：

#include "myinclude.h"int main(int argc, char *argv[]){int sockfd,sendbytes;char buf[BUFFER_SIZE];struct hostent *host;struct sockaddr_in serv_adr;if(argc < 3){fprintf(stderr,"USAGE:./client Hostname(or ipaddress)Text\n ");exit(1);}/* address resolution function */if((host = gethostbyname(argv[1])) == NULL){perror("gethostbyname");exit(1);}memset(buf,0,sizeof(buf));sprintf(buf,"%s",argv[2]);/* create socket */if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1){perror("socket");exit(1);}/* set up the structure-related parameters of sockaddr_in */serv_adr.sin_family = AF_INET;serv_adr.sin_port = htons(PORT);serv_adr.sin_addr = *((struct in_addr *)host->h_addr);bzero(&(serv_adr.sin_zero),8);/* call connect function Initiate a connection to the server */if(connect(sockfd,(struct sockaddr *)&serv_adr,sizeof(struct sockaddr)) == -1){perror("connect");exit(1);}/* send messages to server */if((sendbytes = send(sockfd,buf,strlen(buf),0))==-1){perror("Send");exit(1);}close(sockfd);exit(0);}

验证程序

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