hunt.c revision 7527 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char sccsid[] = "@(#)hunt.c	8.1 (Berkeley) 6/6/93";
36#endif /* not lint */
37
38#include "tipconf.h"
39#include "tip.h"
40
41extern char *getremote();
42extern char *rindex();
43
44static	jmp_buf deadline;
45static	int deadfl;
46
47void
48dead()
49{
50	deadfl = 1;
51	longjmp(deadline, 1);
52}
53
54hunt(name)
55	char *name;
56{
57	register char *cp;
58	sig_t f;
59
60	f = signal(SIGALRM, dead);
61	while (cp = getremote(name)) {
62		deadfl = 0;
63		uucplock = rindex(cp, '/')+1;
64		if (uu_lock(uucplock) < 0)
65			continue;
66		/*
67		 * Straight through call units, such as the BIZCOMP,
68		 * VADIC and the DF, must indicate they're hardwired in
69		 *  order to get an open file descriptor placed in FD.
70		 * Otherwise, as for a DN-11, the open will have to
71		 *  be done in the "open" routine.
72		 */
73		if (!HW)
74			break;
75		if (setjmp(deadline) == 0) {
76			alarm(10);
77			FD = open(cp, O_RDWR);
78		}
79		alarm(0);
80		if (FD < 0) {
81			perror(cp);
82			deadfl = 1;
83		}
84		if (!deadfl) {
85			ioctl(FD, TIOCEXCL, 0);
86#if HAVE_TERMIOS
87			{
88				struct termios t;
89				if (tcgetattr(FD, &t) == 0) {
90					t.c_cflag |= HUPCL;
91					(void)tcsetattr(FD, TCSANOW, &t);
92				}
93			}
94#else /* HAVE_TERMIOS */
95#ifdef TIOCHPCL
96			ioctl(FD, TIOCHPCL, 0);
97#endif
98#endif /* HAVE_TERMIOS */
99			signal(SIGALRM, SIG_DFL);
100			return ((int)cp);
101		}
102		(void)uu_unlock(uucplock);
103	}
104	signal(SIGALRM, f);
105	return (deadfl ? -1 : (int)cp);
106}
107