1 /* $NetBSD: hunt.c,v 1.18 2011/09/06 18:33:01 joerg Exp $ */
2
3 /*
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)hunt.c 8.1 (Berkeley) 6/6/93";
36 #endif
37 __RCSID("$NetBSD: hunt.c,v 1.18 2011/09/06 18:33:01 joerg Exp $");
38 #endif /* not lint */
39
40 #include "tip.h"
41
42 static jmp_buf deadline;
43 static int deadfl;
44
45 __dead static void dead(int);
46
47 static void
48 /*ARGSUSED*/
dead(int dummy __unused)49 dead(int dummy __unused)
50 {
51 deadfl = 1;
52 longjmp(deadline, 1);
53 }
54
55 int
hunt(char * name)56 hunt(char *name)
57 {
58 char *cp;
59 sig_t f;
60
61 f = signal(SIGALRM, dead);
62 while ((cp = getremote(name)) != NULL) {
63 deadfl = 0;
64 /*
65 * Straight through call units, such as the BIZCOMP,
66 * VADIC and the DF, must indicate they're hardwired in
67 * order to get an open file descriptor placed in FD.
68 * Otherwise, as for a DN-11, the open will have to
69 * be done in the "open" routine.
70 */
71 if (!HW)
72 break;
73 if (setjmp(deadline) == 0) {
74 (void)alarm(10);
75 FD = open(cp, (O_RDWR | (DC ? O_NONBLOCK : 0)));
76 }
77 (void)alarm(0);
78 if (FD < 0) {
79 warn("%s", cp);
80 deadfl = 1;
81 } else if (!deadfl) {
82 struct termios cntrl;
83
84 if (flock(FD, (LOCK_EX|LOCK_NB)) != 0) {
85 (void)close(FD);
86 FD = -1;
87 continue;
88 }
89
90 (void)tcgetattr(FD, &cntrl);
91 if (!DC)
92 cntrl.c_cflag |= HUPCL;
93 (void)tcsetattr(FD, TCSAFLUSH, &cntrl);
94 (void)ioctl(FD, TIOCEXCL, 0);
95 (void)signal(SIGALRM, SIG_DFL);
96 return (cp != NULL);
97 }
98 }
99 (void)signal(SIGALRM, f);
100 return (deadfl ? -1 : cp != NULL);
101 }
102