hunt.c revision 25697 
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 <sys/types.h>
39#include <libutil.h>
40#include "tipconf.h"
41#include "tip.h"
42
43extern char *getremote();
44extern char *rindex();
45
46static	jmp_buf deadline;
47static	int deadfl;
48
49void
50dead()
51{
52	deadfl = 1;
53	longjmp(deadline, 1);
54}
55
56hunt(name)
57	char *name;
58{
59	register char *cp;
60	sig_t f;
61	int res;
62
63	f = signal(SIGALRM, dead);
64	while (cp = getremote(name)) {
65		deadfl = 0;
66		uucplock = rindex(cp, '/')+1;
67		if ((res = uu_lock(uucplock)) != UU_LOCK_OK) {
68			if (res != UU_LOCK_INUSE)
69				fprintf(stderr, "uu_lock: %s\n", uu_lockerr(res));
70			continue;
71		}
72		/*
73		 * Straight through call units, such as the BIZCOMP,
74		 * VADIC and the DF, must indicate they're hardwired in
75		 *  order to get an open file descriptor placed in FD.
76		 * Otherwise, as for a DN-11, the open will have to
77		 *  be done in the "open" routine.
78		 */
79		if (!HW)
80			break;
81		if (setjmp(deadline) == 0) {
82			alarm(10);
83			FD = open(cp, O_RDWR);
84		}
85		alarm(0);
86		if (FD < 0) {
87			perror(cp);
88			deadfl = 1;
89		}
90		if (!deadfl) {
91			ioctl(FD, TIOCEXCL, 0);
92#if HAVE_TERMIOS
93			{
94				struct termios t;
95				if (tcgetattr(FD, &t) == 0) {
96					t.c_cflag |= HUPCL;
97					(void)tcsetattr(FD, TCSANOW, &t);
98				}
99			}
100#else /* HAVE_TERMIOS */
101#ifdef TIOCHPCL
102			ioctl(FD, TIOCHPCL, 0);
103#endif
104#endif /* HAVE_TERMIOS */
105			signal(SIGALRM, SIG_DFL);
106			return ((int)cp);
107		}
108		(void)uu_unlock(uucplock);
109	}
110	signal(SIGALRM, f);
111	return (deadfl ? -1 : (int)cp);
112}
113