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

#define LOCKDIR		"/var/spool/locks"
#define LOCKFILE	LOCKDIR"/LCK.ppp_attach"

main()
{
   int fd;

   if ((fd=open(LOCKFILE, O_RDWR|O_CREAT|O_EXCL)) == -1)
      exit(1);
   else
      {
	 close(fd);
         exit(0);
      }
}