/*standard headers*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

/*socket headers*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

/*types*/
#include <signal.h>
#include <sys/types.h>

void exit_err(const char *error_msg)
{
	fputs(error_msg,stderr);
	exit(-1);
}

int main()
{
	int fd_sock , new_fd;
	struct sockaddr_in my_addr , their_addr;

	int sin_size;
	struct sigaction sa;
	int yes = 1;
 
	if((fd_sock = socket(AF_INET,SOCK_DGRAM,0)) < 0)
		exit_err("error in fd\n");

	if(setsockopt(fd_sock , SOL_SOCKET , SO_REUSEADDR , &yes , sizeof(int)) < 0)
		exit_err("error in sockopt\n");

	my_addr.sin_family = AF_INET;
	my_addr.sin_port = htons(4829);
	my_addr.sin_addr.s_addr = INADDR_ANY;
	bzero(&(my_addr.sin_zero),8);

	if(bind(fd_sock , (struct sockaddr*)&my_addr , sizeof(struct sockaddr)) < 0)
		exit_err("errir in bind\n");

	if(listen(fd_sock,10) < 0)
		exit_err("error listening\n");

	return 0;
}

	if(!(he = gethostbyname("localhost")))		exit_err("error : no such host\n");	//...	their_addr.sin_addr = *((struct in_addr*)he->h_addr);

	if(!(he = (struct hostent*)gethostbyname("localhost")))		exit_err("error no such host\n");	their_addr.sin_addr = (struct in_addr)he->h_addr;