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Incorporate some NetBSD changes:
tip.c
    getchar() returns an int [important since EOF == -1] (thorpej)
    Set CLOCAL if dc flag is set (mellon)
tip.h
    Change booleans from char to short so that comparisons against negative
    values work as expected on systems with unsigned chars. (thorpej)
    Add boolean for dc flag (mellon)
hunt.c
    Set O_NONBLOCK if dc flag set. Don't set HUPCL if dc flag is set. (mellon)
remote.c
    Add boolean for dc flag (mellon)

/*	$OpenBSD: hunt.c,v 1.5 1997/04/20 23:29:32 millert Exp $	*/
/*	$NetBSD: hunt.c,v 1.6 1997/04/20 00:02:10 mellon Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)hunt.c	8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: hunt.c,v 1.5 1997/04/20 23:29:32 millert Exp $";
#endif /* not lint */

#include "tip.h"

extern char *getremote();

static	jmp_buf deadline;
static	int deadfl;

void
dead()
{
	deadfl = 1;
	longjmp(deadline, 1);
}

long
hunt(name)
	char *name;
{
	register char *cp;
	sig_t f;

	f = signal(SIGALRM, dead);
	while (cp = getremote(name)) {
		deadfl = 0;
		uucplock = strrchr(cp, '/')+1;
		if (uu_lock(uucplock) < 0)
			continue;
		/*
		 * Straight through call units, such as the BIZCOMP,
		 * VADIC and the DF, must indicate they're hardwired in
		 *  order to get an open file descriptor placed in FD.
		 * Otherwise, as for a DN-11, the open will have to
		 *  be done in the "open" routine.
		 */
		if (!HW)
			break;
		if (setjmp(deadline) == 0) {
			alarm(10);
			FD = open(cp, (O_RDWR |
				       (boolean(value(DC)) ? O_NONBLOCK : 0)));
		}
		alarm(0);
		if (FD < 0) {
			perror(cp);
			deadfl = 1;
		}
		if (!deadfl) {
			struct termios cntrl;

			tcgetattr(FD, &cntrl);
			if (!boolean(value(DC)))
				cntrl.c_cflag |= HUPCL;
			tcsetattr(FD, TCSAFLUSH, &cntrl);
			ioctl(FD, TIOCEXCL, 0);
			signal(SIGALRM, SIG_DFL);
			return ((long)cp);
		}
		(void)uu_unlock(uucplock);
	}
	signal(SIGALRM, f);
	return (deadfl ? -1 : (long)cp);
}