linux下面的tcp編程

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首先要建立伺服器建立起socket，然後與本地的連接埠進行綁定，接著就開始接收用戶端的請求並建立與它的串連，接下來，用戶端發送的訊息。

tcpserver.c代碼：

int main(){struct sockaddr_in server_sockaddr,client_sockaddr;int sin_size,recvbytes;int sockfd, client_fd;char buf[BUFFER_SIZE];/* 建立socket串連 */if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1){perror("socket");exit(1);}printf("Socket id = %d\n",sockfd);/* 設定socket_in 結構體中相關的參數 */server_sockaddr.sin_family = AF_INET;               /* ipv4的協議 */server_sockaddr.sin_port = htons(PORT);             /* 設定連接埠 */server_sockaddr.sin_addr.s_addr = INADDR_ANY;       /* ip地址伺服器這邊的地址 */bzero(&(server_sockaddr.sin_zero),8);               /* 保持位元 */int i = 1; /* 允許重複使用本地地址與通訊端進行綁定 */setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR, &i,sizeof(i));/* 綁定函數bind（） */if(bind(sockfd,(struct sockaddr *)&server_sockaddr,sizeof(struct sockaddr))== -1){perror("bind");exit(1);}printf("bind success!\n");/* 調用listen（）函數，建立未處理請求的隊列 */if( listen(sockfd, MAX_QUE_CONN_NM) == -1){perror("listen");exit(1);}printf("Listening....\n");/* 調用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);}

用戶端的程式：

#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);}

驗證程式 

linux下面的tcp編程