I am still trying to get getty to respond when a modem answers the
line.  Getty now opens the port, but (apparently) fails when it calls
login_tty().  Below is a portion of getty (from main.c) and the log
output generated (note that /* XXX */ is logging code I added; the
rest is the 1.2 distributed version).  I am at a loss about how to
track down the problem with login_tty; any help is greatly
appreciated.

Thanks for your help.

Cheers,
Brook

===========================================================================
modem port:

lrwxr-xr-x  1 root  wheel         5 Jan 11 14:39 /dev/modem -> tty02
crw-------  1 root  wheel    8,   2 May 17 10:42 /dev/tty02

===========================================================================
/etc/ttys (in part):

modem	"/usr/libexec/getty Pc"		unknown  on rtscts

===========================================================================
/usr/src/libexec/getty/main.c (in part; installed as /usr/libexec/getty):

#ifndef lint
/*static char sccsid[] = "from: @(#)main.c	8.1 (Berkeley) 6/20/93";*/
static char rcsid[] = "$Id: main.c,v 1.17 1996/05/15 23:46:52 jtc Exp $";
#endif /* not lint */

<parts deleted>

int
main(argc, argv)
	int argc;
	char *argv[];
{

<parts deleted>

	if (argc <= 2 || strcmp(argv[2], "-") == 0)
	    strcpy(ttyn, ttyname(0));
	else {
	    int i;

	    strcpy(ttyn, dev);
	    strncat(ttyn, argv[2], sizeof(ttyn)-sizeof(dev));
	    if (strcmp(argv[0], "+") != 0) {
		chown(ttyn, 0, 0);
		chmod(ttyn, 0600);
		revoke(ttyn);
		/*
		 * Delay the open so DTR stays down long enough to be detected.
		 */
		sleep(2);
		syslog(LOG_ERR, "opening %s", ttyn);	/* XXX */
		while ((i = open(ttyn, O_RDWR)) == -1) {
			if ((repcnt % 10 == 0) &&
			    (errno != ENXIO || !failopenlogged)) {
				syslog(LOG_ERR, "%s: %m", ttyn);
				closelog();
				failopenlogged = 1;
			}
			repcnt++;
			sleep(60);
		}
		syslog(LOG_ERR, "%s open:  fd=%d", ttyn, i);	/* XXX */
		syslog(LOG_ERR, "calling login_tty(%d)", i);	/* XXX */
		login_tty(i);
		syslog(LOG_ERR, "login_tty(%d) returned", i);	/* XXX */
	    }
	}

<remainder deleted>

===========================================================================
syslog messages:

May 17 10:40:39 trillium getty[11316]: opening /dev/modem
May 17 10:41:28 trillium getty[11316]: /dev/modem open:  fd=1
May 17 10:41:28 trillium getty[11316]: calling login_tty(1)
May 17 10:42:16 trillium getty[11320]: opening /dev/modem

Note that these are consecutive messages so it appears that a new
getty is spawned after login_tty() is called and the log message
immediately following the login_tty() call is never made.

Thanks for any help you can offer on how to trace the problem.