Socket programming under Linux

1. Create a socket

int LISTENFD;LISTENFD = socket (af_inet, sock_stream, 0); Streaming sockets if (LISTENFD < 0) {  perror ("socket");  Exit (1);    }

2. Bind bind

structsockaddr_in serv_addr, Cli_addr;bzero (&SERV_ADDR,sizeof(SERV_ADDR)); Sin.sin_family=Af_inet;sin.sin_port= Htons (6363);//Port numberSIN.SIN_ADDR.S_ADDR = htonl (Inaddr_any);//IP Address//Avoid binding not succeedingintOn =1; setsockopt (SOCKFD, Sol_socket, SO_REUSEADDR,&on,sizeof(int));if(Bind (LISTENFD, (structSOCKADDR *) &serv_addr,sizeof(SERV_ADDR)) == -1) {perror ("bind failed.\n"); Exit (1);} 

3. Monitoring Listen

if (Listen (LISTENFD, n) = =-1//  N represents the number of listeners {    perror ("Listen failed\n");    Exit (1);}

4.accept

intclientfd;//struct sockaddr_in cli_addr;intLen =sizeof(structsockaddr); Clientfd= Accept (SERVERFD, (structsockaddr*) &cli_addr, &len);if(Clientfd = =-1) {perror ("Accept failed\n"); Exit (1);}Elseprintf ("Accept succeed\n");

5. Connecting to connect

intsockfd;structsockaddr_in serv_addr;host= GetHostByName ("127.0.0.1"); SOCKFD= Socket (Af_inet, Sock_stream,0); Bzero (&SERV_ADDR,sizeof(structsockaddr)); Serv_addr.sin_family=Af_inet;serv_addr.sin_port= Htons (port);//Port Port NumberSERV_ADDR.SIN_ADDR = * ((structIN_ADDR *) host->h_addr);if(Connect (SOCKFD,structSOCKADDR *) &serv_addr,sizeof(structSOCKADDR)) = =-1) {printf ("Connect failed\n"); Exit (1);}Elseprintf ("connect succeed \ n");

6. Sending data Send//TCP

0);

7. Receiving data recv//TCP

intRecvnum;CharBuf[buf_size];//Define buf_size 1024x768if(Recvnum = recv (SOCKFD, buf, Buf_size,0)) >0) {printf ("recv:%s\n", buf);}Else if(Recvnum = =-1) {perror ("Recv-1"); Exit (1);}

8. Create a thread

1. Add header file # include<pthread.h>2. Adding parameters at compile time gcc-G xxx.c-o xxx-pthread3. pthread_t pid;intSockfd;pthread_create (&pid, NULL, (void*) Recv_data, (void*) &SOCKFD); of which:void*recv_data (void*FD) {  intSOCKFD = * ((int*) FD); ...     while(1) {recv (...); }  }

　

Socket programming under Linux