hunt.c revision 88276 
1/*	$OpenBSD: hunt.c,v 1.8 2001/10/24 18:38:58 millert Exp $	*/
2/*	$NetBSD: hunt.c,v 1.6 1997/04/20 00:02:10 mellon Exp $	*/
3
4/*
5 * Copyright (c) 1983, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/usr.bin/tip/tip/hunt.c 88276 2001-12-20 14:25:46Z markm $");
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)hunt.c	8.1 (Berkeley) 6/6/93";
43static char rcsid[] = "$OpenBSD: hunt.c,v 1.8 2001/10/24 18:38:58 millert Exp $";
44#endif
45#endif /* not lint */
46
47#include "tip.h"
48
49extern char *getremote();
50
51static	jmp_buf deadline;
52static	int deadfl;
53
54void
55dead()
56{
57	deadfl = 1;
58	longjmp(deadline, 1);
59}
60
61long
62hunt(name)
63	char *name;
64{
65	char *cp;
66	sig_t f;
67
68	f = signal(SIGALRM, dead);
69	while ((cp = getremote(name))) {
70		deadfl = 0;
71		uucplock = strrchr(cp, '/');
72		if (uucplock == NULL)
73			uucplock = cp;
74		else
75			uucplock++;
76
77		if (uu_lock(uucplock) < 0)
78			continue;
79		/*
80		 * Straight through call units, such as the BIZCOMP,
81		 * VADIC and the DF, must indicate they're hardwired in
82		 *  order to get an open file descriptor placed in FD.
83		 * Otherwise, as for a DN-11, the open will have to
84		 *  be done in the "open" routine.
85		 */
86		if (!HW)
87			break;
88		if (setjmp(deadline) == 0) {
89			alarm(10);
90			FD = open(cp, (O_RDWR |
91				       (boolean(value(DC)) ? O_NONBLOCK : 0)));
92		}
93		alarm(0);
94		if (FD < 0) {
95			perror(cp);
96			deadfl = 1;
97		}
98		if (!deadfl) {
99			struct termios cntrl;
100
101			tcgetattr(FD, &cntrl);
102			if (!boolean(value(DC)))
103				cntrl.c_cflag |= HUPCL;
104			tcsetattr(FD, TCSAFLUSH, &cntrl);
105			ioctl(FD, TIOCEXCL, 0);
106			signal(SIGALRM, SIG_DFL);
107			return ((long)cp);
108		}
109		(void)uu_unlock(uucplock);
110	}
111	signal(SIGALRM, f);
112	return (deadfl ? -1 : (long)cp);
113}
114