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4b3ef9ea WJ |
1 | /* |
2 | * Copyright (c) 1983 The Regents of the University of California. | |
3 | * 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 | static char sccsid[] = "@(#)hunt.c 5.6 (Berkeley) 6/1/90"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | #include "tip.h" | |
39 | ||
40 | extern char *getremote(); | |
41 | extern char *rindex(); | |
42 | ||
43 | static jmp_buf deadline; | |
44 | static int deadfl; | |
45 | ||
46 | void | |
47 | dead() | |
48 | { | |
49 | deadfl = 1; | |
50 | longjmp(deadline, 1); | |
51 | } | |
52 | ||
53 | hunt(name) | |
54 | char *name; | |
55 | { | |
56 | register char *cp; | |
57 | sig_t f; | |
58 | ||
59 | f = signal(SIGALRM, dead); | |
60 | while (cp = getremote(name)) { | |
61 | deadfl = 0; | |
62 | uucplock = rindex(cp, '/')+1; | |
63 | if (uu_lock(uucplock) < 0) | |
64 | continue; | |
65 | /* | |
66 | * Straight through call units, such as the BIZCOMP, | |
67 | * VADIC and the DF, must indicate they're hardwired in | |
68 | * order to get an open file descriptor placed in FD. | |
69 | * Otherwise, as for a DN-11, the open will have to | |
70 | * be done in the "open" routine. | |
71 | */ | |
72 | if (!HW) | |
73 | break; | |
74 | if (setjmp(deadline) == 0) { | |
75 | alarm(10); | |
76 | FD = open(cp, O_RDWR); | |
77 | } | |
78 | alarm(0); | |
79 | if (FD < 0) { | |
80 | perror(cp); | |
81 | deadfl = 1; | |
82 | } | |
83 | if (!deadfl) { | |
84 | ioctl(FD, TIOCEXCL, 0); | |
85 | ioctl(FD, TIOCHPCL, 0); | |
86 | signal(SIGALRM, SIG_DFL); | |
87 | return ((int)cp); | |
88 | } | |
89 | (void)uu_unlock(uucplock); | |
90 | } | |
91 | signal(SIGALRM, f); | |
92 | return (deadfl ? -1 : (int)cp); | |
93 | } |