socket的TCP通信简单例子

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/*tcp客户端程序，注意一定要修改addr的值和本机相同才能正常工作*/#include <stdio.h>#include <unistd.h>#include <sys/types.h>/* See NOTES */#include <sys/socket.h>#include <arpa/inet.h>#include <string.h>#include <netinet/in.h>#include <stdlib.h>#include <errno.h>int main(void){int sock;int server_len;struct sockaddr_in server_address;sock = socket(PF_INET, SOCK_STREAM, 0); //创建SOCKETserver_address.sin_family = AF_INET;//指定通讯协议server_address.sin_addr.s_addr = htonl(INADDR_ANY);//或是指定当前IP地址inet_addr("192.168.88.123");server_address.sin_port = htons(12345);connect(sock,(struct sockaddr*)&server_address,sizeof(server_address));char sendbuf[1024]={0};char recvbuf[1024]={0};while(fgets(sendbuf,sizeof(sendbuf),stdin) != NULL){write(sock,sendbuf,sizeof(sendbuf));read(sock,recvbuf,sizeof(recvbuf));fputs(recvbuf,stdout);memset(sendbuf,0,sizeof(sendbuf));memset(recvbuf,0,sizeof(recvbuf));}close(sock);return 0;}

#include <stdio.h>#include <unistd.h>/*tcp服务器程序*/#include <sys/types.h>/* See NOTES */#include <sys/socket.h>#include <arpa/inet.h>#include <string.h>#include <netinet/in.h>#include <stdlib.h>#include <errno.h>int main(void){int server_sockfd,client_sockfd;int server_len,client_len;struct sockaddr_in server_address,client_address;server_sockfd = socket(PF_INET, SOCK_STREAM, 0);//创建SOCKETserver_address.sin_family = AF_INET;//指定通讯协议server_address.sin_addr.s_addr = htonl(INADDR_ANY);//相当于0.0.0.0server_address.sin_port = htons(12345);server_len = sizeof(server_address);bind(server_sockfd, (struct sockaddr *)&server_address, server_len);//绑定SOCKET对象listen(server_sockfd, SOMAXCONN);printf("SOMAXCONN:%d\n",SOMAXCONN);client_len=sizeof(client_address);client_sockfd=accept(server_sockfd, (struct sockaddr *)&client_address, (socklen_t *)&client_len);char recvbuf[1024];while(1){memset(recvbuf,0,sizeof(recvbuf));read(client_sockfd, recvbuf, sizeof(recvbuf));fputs(recvbuf,stdout);write(client_sockfd,recvbuf,sizeof(recvbuf));}close(server_sockfd);close(client_sockfd);return 0;}

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