/*      $OpenBSD: hunt.c,v 1.13 2006/03/17 19:39:46 deraadt Exp $       */
/*      $NetBSD: hunt.c,v 1.6 1997/04/20 00:02:10 mellon Exp $  */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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. 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.
 */

#include "tip.h"

static  jmp_buf deadline;
static  int deadfl;

static void     dead(int);

/*ARGSUSED*/
static void
dead(int signo)
{
        deadfl = 1;
        longjmp(deadline, 1);
}

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

        f = signal(SIGALRM, dead);
        while ((cp = getremote(name))) {
                deadfl = 0;
                uucplock = strrchr(cp, '/');
                if (uucplock == NULL)
                        uucplock = cp;
                else
                        uucplock++;

                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);
}