hunt.c revision 28365 
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
35#if 0
36static char sccsid[] = "@(#)hunt.c	8.1 (Berkeley) 6/6/93";
37#endif
38static const char rcsid[] =
39	"$Id$";
40#endif /* not lint */
41
42#include <sys/types.h>
43#include <err.h>
44#include <libutil.h>
45#include "tipconf.h"
46#include "tip.h"
47
48extern char *getremote();
49extern char *rindex();
50
51static	jmp_buf deadline;
52static	int deadfl;
53
54void
55dead()
56{
57	deadfl = 1;
58	longjmp(deadline, 1);
59}
60
61int
62hunt(name)
63	char *name;
64{
65	register char *cp;
66	sig_t f;
67	int res;
68
69	f = signal(SIGALRM, dead);
70	while ((cp = getremote(name))) {
71		deadfl = 0;
72		uucplock = rindex(cp, '/')+1;
73		if ((res = uu_lock(uucplock)) != UU_LOCK_OK) {
74			if (res != UU_LOCK_INUSE)
75				fprintf(stderr, "uu_lock: %s\n", uu_lockerr(res));
76			continue;
77		}
78		/*
79		 * Straight through call units, such as the BIZCOMP,
80		 * VADIC and the DF, must indicate they're hardwired in
81		 *  order to get an open file descriptor placed in FD.
82		 * Otherwise, as for a DN-11, the open will have to
83		 *  be done in the "open" routine.
84		 */
85		if (!HW)
86			break;
87		if (setjmp(deadline) == 0) {
88			alarm(10);
89			FD = open(cp, O_RDWR);
90		}
91		alarm(0);
92		if (FD < 0) {
93			warn("%s", cp);
94			deadfl = 1;
95		}
96		if (!deadfl) {
97			ioctl(FD, TIOCEXCL, 0);
98#if HAVE_TERMIOS
99			{
100				struct termios t;
101				if (tcgetattr(FD, &t) == 0) {
102					t.c_cflag |= HUPCL;
103					(void)tcsetattr(FD, TCSANOW, &t);
104				}
105			}
106#else /* HAVE_TERMIOS */
107#ifdef TIOCHPCL
108			ioctl(FD, TIOCHPCL, 0);
109#endif
110#endif /* HAVE_TERMIOS */
111			signal(SIGALRM, SIG_DFL);
112			return ((int)cp);
113		}
114		(void)uu_unlock(uucplock);
115	}
116	signal(SIGALRM, f);
117	return (deadfl ? -1 : (int)cp);
118}
119