#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

#define FILENAME "testfile"

main()
{
  int fd;
  char *msg;

  if ((fd = open(FILENAME, O_RDONLY)) == -1)  {
    msg = (char *)malloc(sizeof(char)*80);
    sprintf(msg, "Error opening file %s", FILENAME);
    perror(msg);
  }  // end if

  
}