A Linux socket Programming example, the Client connection server

With regard to socket programming, the following articles are well written: http://www.cnblogs.com/xudong-bupt/archive/2013/12/29/3483059.html

1. The Accept () function, if the client has not been connected, the server is blocked at the Accept () function.

The following is the client code

//============================================================================//Name:client.cpp//Author:yjzhuang//Version://Copyright: [email protected]//Description:hello World in C + +, Ansi-style//============================================================================#include<iostream>#include<sys/Select.h>#include<sys/socket.h>#include<unistd.h>#include<pthread.h>#include<stdio.h>#include<sys/types.h>#include<netinet/inch.h>#include<arpa/inet.h>#include<string>#include<string.h>using namespacestd;#defineServer_ip "127.0.0.1"#defineServer_port 9090#defineBUFSIZE 1024intGetsocket () {intFD =socket (af_inet, Sock_stream,0 ); cout<<"fd="<<fd<<Endl; if(-1==FD) {cout<<"Error, FD is-1"<<Endl; }    returnFD;}/** * Connect to server side, if successful, return FD if failed returns-1*/intConnectServer () {intFD =Getsocket (); cout<<"fd="<<fd<<Endl; if(-1==FD) {cout<<"Error, ConnectServer () quit"<<Endl; return-1; }    structSockaddr_in remote_addr;//server-side network address structurememset (&AMP;REMOTE_ADDR,0,sizeof(REMOTE_ADDR));//data Initialization--clear 0Remote_addr.sin_family=af_inet;//set to IP communicationREMOTE_ADDR.SIN_ADDR.S_ADDR=INET_ADDR (SERVER_IP);//Server IP AddressRemote_addr.sin_port=htons (Server_port);//Server port number    intCon_result = Connect (FD, (structsockaddr*) &remote_addr,sizeof(structsockaddr)); if(Con_result <0) {cout<<"Connect error!"<<Endl; return-1; } cout<<"con_result="<<con_result<<Endl; returnFD;}/** * * * Connect to server side and continue to send heartbeat data to server side*/void* HeartBeat (void*Arg) {cout<<"Heart Bead started!"<<Endl; intFD =ConnectServer (); if(fd<0) {cout<<"Heart Bead quit!"<<Endl; return 0; }    CharBuf[bufsize];//buffer for data transfer    stringValue ="This is heart beat msg!";        strcpy (buf, Value.c_str ());  while(true) {cout<<"To write Data"<<Endl; cout<<"buf="<<buf<<", len="<<strlen (BUF) <<Endl; intWrite_num =Write (FD, buf, strlen (BUF)); cout<<"write_num="<<write_num<<Endl; Sleep (2); } cout<<"Heart Bead finished!"<<Endl; return 0;}/** * * Create a new thread and call the heartbeat () function in a new thread*/voidThreadcall () {pthread_t thread; Pthread_create (&thread,null,heartbeat,null); Pthread_detach (thread);}intMain () {cout<<"Main started"<< Endl;//prints Hello World!!!Threadcall (); Sleep (10000000); cout<<"Main finished"<<Endl; return 0;}

The following is the server code

/** server.cpp * * Created on:2014 November 14 * Author:yjzhuang*/#include<iostream>#include<sys/Select.h>#include<sys/socket.h>#include<stdio.h>#include<unistd.h>#include<pthread.h>#include<stdio.h>#include<sys/types.h>#include<netinet/inch.h>#include<arpa/inet.h>#include<string>#include<string.h>using namespacestd;#defineServer_ip "127.0.0.1"#defineServer_port 9090#defineBUFSIZE 1024intGetsocket () {intFD =socket (af_inet, Sock_stream,0 ); if(-1==FD) {cout<<"Error, FD is-1"<<Endl; }    returnFD;}intMain () {intFD =Getsocket (); if(fd<0) {cout<<"Error in Main (), fd<0"<<Endl; } cout<<"fd="<<fd<<Endl; //----Bind the IP and port to the server main thread------------------------------    structSockaddr_in local_addr;//server-side network address structurememset (&AMP;LOCAL_ADDR,0,sizeof(LOCAL_ADDR));//data Initialization--clear 0Local_addr.sin_family=af_inet;//set to IP communicationLOCAL_ADDR.SIN_ADDR.S_ADDR=INET_ADDR (SERVER_IP);//Server IP AddressLocal_addr.sin_port=htons (Server_port);//Server port number    intBind_result = Bind (FD, (structsockaddr*) &local_addr,sizeof(structsockaddr)); if(Bind_result <0) {cout<<"Bind Error in main ()"<<Endl; return-1; } cout<<"bind_result="<<bind_result<<Endl; //---------------------------------------------Listen (FD,Ten); structsockaddr_in remote_addr; intSin_size=sizeof(structsockaddr_in); cout<<"before accept"<<Endl; intNEW_FD = Accept (FD, (structsockaddr*) &remote_addr, (socklen_t*) &sin_size); cout<<"After accept"<<Endl; if(New_fd <0) {cout<<"Accept Error in main ()"<<Endl; return-1; } cout<<"NEW_FD accepted is"<<new_fd<<Endl; CharBuffer[bufsize];  while(true) {cout<<"wait to read data ..."<<Endl; intLen =Read (new_fd, buffer, BUFSIZE); if(len = =0) {cout<<"Read from socket finished"<<Endl; return 0; }Else if(Len <0) {cout<<"Read from socket error"<<Endl; return-1; } cout<<"Accept Data:"<<buffer<<Endl; Sleep (Ten); }}

A Linux socket Programming example, the Client connection server