#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/utsname.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <netdb.h>#include <unistd.h>#include <fcntl.h>#define bufsize 255#define namesize 20int tcpSocket(){	int n;	if ( (n = socket(AF_INET,SOCK_STREAM,0))==-1){    	perror("TCP Socket error");    	exit(1);  	}  	return(n);}void Setsockopt(int s){	int on = 1;  	struct linger linger = { 0 };  	linger.l_onoff = 1;  	linger.l_linger = 30;  	if ( setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *) &on, sizeof(on))==-1){    	perror("Setsockopt(...,SO_REUSEADDR,...)");    	exit(1);  	}  	if ( setsockopt(s, SOL_SOCKET, SO_LINGER, (const char *) &linger, sizeof(linger))==-1){    	perror("Setsockopt(...,SO_LINGER,...)");    	exit(1);  	}}void Connect(int  sockfd,  const  struct sockaddr *sock_addr){  	if (-1 == connect(sockfd, sock_addr, sizeof(*sock_addr))){    	printf("Server haven't started\n");    	exit(1);  	}}void GetHostName(char *buffer, int length){  	struct utsname sysname = { 0 };  	int status = 0;  	status = uname(&sysname);  	if (-1 != status){    	strncpy(buffer, sysname.nodename, length);  	}  	else{    	perror("GetHostName()");    	exit(1);  	}}void CreateSockAddr2(const char *hostname,struct sockaddr_in *sockaddress,int port){  	struct hostent *host = NULL;  	host = gethostbyname(hostname);  	if (NULL == host){    	host = gethostbyaddr(hostname,strlen(hostname), AF_INET);    	if (NULL == host){      	perror("Error resolving server address");      	exit(1);    		}  	}  	(void) memset(sockaddress, 0, sizeof(sockaddress));  	(void) memcpy(&((*sockaddress).sin_addr), host->h_addr, host->h_length);  	sockaddress->sin_addr.s_addr = inet_addr(hostname);//htonl(INADDR_ANY);  	sockaddress->sin_family = AF_INET;  	sockaddress->sin_port = htons(port);}ssize_t Send(int s, const void *buf){  	ssize_t sendn;  	if( -1==(sendn=send(s, buf, strlen(buf), 0))){    	perror("Send()");    	close(s);  	}  	return sendn;}ssize_t Recv(int s, void *buf){  	ssize_t recvn;  	if( -1==(recvn= recv(s, buf, bufsize, 0))){    	perror("Recv()");    	close(s);  	}  	return recvn;}char *Fgets(char *s){  	bzero(s,bufsize);  	if(fgets(s,bufsize,stdin)==NULL){    	perror("Fgets()");    	exit(1);  	}  	return s;}void Rtrim(char *buf){  	int i;  	for(i=0;i<255;i++){    	if(buf[i]=='\n'){      	buf[i]=0;      	break;    		}  	}}