#include <stdio.h>#include <netinet/in.h>#include <netinet/tcp.h>#include <sys/socket.h>#include <errno.h>#include <netdb.h>#include <stdlib.h>#include <unistd.h>#include <pthread.h>#include <termios.h>#include <string.h>//char g_center_host[16] = "10.128.226.221";char g_center_port[8]  = "8003";//int connect_to_center(int trynum,int wait_second);int tcp_connect2(const char *host, const char *serv);int main(int argc, int *argv[]){/*	if (argc<3)	{		printf( "para too few!\n" );		return -1;	}//	*/	int ret;	ret = connect_to_center( 10, 1 );	//usleep(10 * 1000 *1000 );	close( ret );	}int tcp_connect2(const char *host, const char *serv){     struct sockaddr_in addr;     struct hostent *hostaddr;     int s;     int reuse;     int port;     char str[256];     int len;          port=atoi(serv);     port =8003;     s = socket(AF_INET, SOCK_STREAM, 0);     if (s == -1) return -1;          hostaddr=gethostbyname(host);     if(!hostaddr)     {     	return -1;     }	          bzero(&addr,sizeof(addr));  	     addr.sin_family = AF_INET;     addr.sin_port = htons(port);     addr.sin_addr.s_addr = htonl(INADDR_ANY);     memcpy(&addr.sin_addr.s_addr,hostaddr->h_addr,hostaddr->h_length);     //inet_     printf( "connecting .................!   " );		     if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) == -1) {	  close(s);	  printf( "connecting failur! \n" );	  return -1;     }     //printf( "swrite: 12345\n" );     send( s, "12345", 6, 0 );     /*printf( "recv...\n" );          len = recv( s, str, 256, 0 );     if (len>0)        printf( "recive: %s\n", str );     usleep( 100 );        printf( "write: quit\n" );     send( s, "quit", 5, 0 );*/             return (s);}int connect_to_center(int trynum,int wait_second){	int fd,i=0;	for(;;)	{		printf( "count: %d\n", i );		fd = tcp_connect2(g_center_host, g_center_port);		if(fd > 0) 		{			printf( "connect success.\n" );						//printf( "write: hello\n" );			//write ( fd, "hello", 6 );			return fd;		}		printf( "connect failed!\n" );		if(trynum == -1 || i++ < trynum)		{			sleep(wait_second);			continue;		}		else break;	}	return fd;}