#include <unistd.h>
#include	<sys/types.h>
#include <stdlib.h>
#include <stdio.h>

void  err_sys(char * msg) {
  printf("%s \n", msg);
  exit(-1); 
}

int
main(void)
{
	pid_t	pid;

	if ( (pid = fork()) < 0)
		err_sys("fork error");
	else if (pid == 0){		/* child */
	  system("ping 200.1.17.73");
		exit(0);
	      }

	/* parent */
	exit(0);
}