103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/* $NetBSD: hunt.c,v 1.14 2006/04/03 04:53:58 christos Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)hunt.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: hunt.c,v 1.14 2006/04/03 04:53:58 christos Exp $");
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#endif /* not lint */
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#include "tip.h"
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static jmp_buf deadline;
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static int deadfl;
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void dead(int);
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void
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/*ARGSUSED*/
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dead(int dummy)
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{
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deadfl = 1;
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longjmp(deadline, 1);
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}
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int
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hunt(char *name)
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{
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char *cp;
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sig_t f;
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f = signal(SIGALRM, dead);
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while ((cp = getremote(name)) != NULL) {
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deadfl = 0;
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/*
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* Straight through call units, such as the BIZCOMP,
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* VADIC and the DF, must indicate they're hardwired in
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* order to get an open file descriptor placed in FD.
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* Otherwise, as for a DN-11, the open will have to
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* be done in the "open" routine.
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*/
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if (!HW)
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break;
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if (setjmp(deadline) == 0) {
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alarm(10);
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FD = open(cp, (O_RDWR | (DC ? O_NONBLOCK : 0)));
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}
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alarm(0);
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if (FD < 0) {
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warn(cp);
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deadfl = 1;
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}
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if (!deadfl) {
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struct termios cntrl;
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if (flock(FD, (LOCK_EX|LOCK_NB)) != 0) {
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close(FD);
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continue;
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}
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tcgetattr(FD, &cntrl);
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if (!DC)
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cntrl.c_cflag |= HUPCL;
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tcsetattr(FD, TCSAFLUSH, &cntrl);
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ioctl(FD, TIOCEXCL, 0);
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signal(SIGALRM, SIG_DFL);
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return (cp != NULL);
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}
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}
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signal(SIGALRM, f);
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return (deadfl ? -1 : cp != NULL);
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}
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