hunt.c revision 24461 
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 <libutil.h>
39#include "tipconf.h"
40#include "tip.h"
41
42extern char *getremote();
43extern char *rindex();
44
45static	jmp_buf deadline;
46static	int deadfl;
47
48void
49dead()
50{
51	deadfl = 1;
52	longjmp(deadline, 1);
53}
54
55hunt(name)
56	char *name;
57{
58	register char *cp;
59	sig_t f;
60	int res;
61
62	f = signal(SIGALRM, dead);
63	while (cp = getremote(name)) {
64		deadfl = 0;
65		uucplock = rindex(cp, '/')+1;
66		if ((res = uu_lock(uucplock)) != UU_LOCK_OK) {
67			if (res != UU_LOCK_INUSE)
68				fprintf(stderr, "uu_lock: %s\n", uu_lockerr(res));
69			continue;
70		}
71		/*
72		 * Straight through call units, such as the BIZCOMP,
73		 * VADIC and the DF, must indicate they're hardwired in
74		 *  order to get an open file descriptor placed in FD.
75		 * Otherwise, as for a DN-11, the open will have to
76		 *  be done in the "open" routine.
77		 */
78		if (!HW)
79			break;
80		if (setjmp(deadline) == 0) {
81			alarm(10);
82			FD = open(cp, O_RDWR);
83		}
84		alarm(0);
85		if (FD < 0) {
86			perror(cp);
87			deadfl = 1;
88		}
89		if (!deadfl) {
90			ioctl(FD, TIOCEXCL, 0);
91#if HAVE_TERMIOS
92			{
93				struct termios t;
94				if (tcgetattr(FD, &t) == 0) {
95					t.c_cflag |= HUPCL;
96					(void)tcsetattr(FD, TCSANOW, &t);
97				}
98			}
99#else /* HAVE_TERMIOS */
100#ifdef TIOCHPCL
101			ioctl(FD, TIOCHPCL, 0);
102#endif
103#endif /* HAVE_TERMIOS */
104			signal(SIGALRM, SIG_DFL);
105			return ((int)cp);
106		}
107		(void)uu_unlock(uucplock);
108	}
109	signal(SIGALRM, f);
110	return (deadfl ? -1 : (int)cp);
111}
112