#
/* sig_maild.c
 *
 * This program sends a signal to the mail daemon to wake it up when
 * it has work to do.  It is a separate program because it must run
 * set-user-id to the mail daemon.
 */

#define	lockfile	"/maild/lock"	/* the mail daemon's lock file */
#define	SIGCTLA		16		/* special interrupt signal */

main ()
{
	char	cpid[10];		/* daemon's pid, from lock file */
	int	pid;			/* integer pid for daemon */
	int	lkfd;			/* lock file descriptor */

	if ((lkfd = open (lockfile, 0)) < 0)
		exit (1);
	read (lkfd, cpid, sizeof (cpid));
	close (lkfd);
	pid = atoi (cpid);
	kill (pid, SIGCTLA);
	}