#ifdef HAVE_CONFIG_H#include <config.h>#endif#include "tcpclient.h"int main(int argc, char *argv[]){	int cstcp,csudp,ccudp;	int server_port=8000; //c-s tcp port  	int CC_port=5000;	//c-c udp port  	struct hostent *hostPtr = NULL;  	struct sockaddr_in adr_srvr = { 0 };  	struct sockaddr_in CC_link = { 0 };  	char hostname[80] = "";  	char buf[bufsize+1]="";  	char *msg;  	char *S_addr = NULL;  	int recvn;  	int childPid;  	if (2 != argc){    	fprintf(stderr, "Usage: %s <serverAddress> \n", argv[0]);    	exit(1);  	}  	S_addr = argv[1];  	cstcp = tcpSocket();  	/*  	*if((cstcp = socket(AF_INET,SOCK_STREAM,0)) == -1 ){  	*perror("socket;");  	*}  	*/  	CreateSockAddr2(S_addr,&adr_srvr,server_port);	//C-S  	//(void) memset(&adr_srvr, 0, sizeof(adr_srvr));  	/*adr_srvr.sin_addr.s_addr = inet_addr(S_addr);//htonl(INADDR_ANY);  	adr_srvr.sin_family = AF_INET;  	adr_srvr.sin_port = htons(port);*/  	Connect(cstcp,(struct sockaddr*) &adr_srvr);  	msg="Client is starting\n";  	Send(cstcp,msg);  	Recv(cstcp,buf);  	printf("%s",buf);  	printf("Connect to server successfully,please input your nickname\n");  	Fgets(buf);  	Send(cstcp,buf);	//send user name  	bzero(buf,bufsize);  	Recv(cstcp,buf);  	while(strncmp(buf,":x",2)==0)  	{    	printf("%s","The name has been used,please change your name:\n");    	Fgets(buf);    	Send(cstcp,buf);	//send user name    	bzero(buf,bufsize);    	Recv(cstcp,buf);  	}  	printf("%s",buf);  	Send(cstcp,":l");	//send com to get userlist form server  	printf("OnLine Users:\n");  	bzero(buf,bufsize);  	Recv(cstcp,buf);	//get userlist from server  	printf("%s",buf);  	childPid = fork();  	switch (childPid){  	case -1: // ERROR    	perror("fork()");    	exit(1);  	case 0: // child process    	while(1){      	bzero(buf,bufsize);      	if(Recv(cstcp,buf)>0)        if(strncmp(buf,":q",2)==0)	exit(0);	//get userlist from server      	printf("%s",buf);	}  	default :    	while(1){      	bzero(buf,bufsize);      	Fgets(buf);      	Send(cstcp,buf);      	if(strncmp(buf,":q",2)==0)        exit(0);	 }  	}return EXIT_SUCCESS;}