Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / dlfcn.c
CommitLineData
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1/*-
2 * Copyright (c) 1998 John D. Polstra
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/lib/libc/gen/dlfcn.c,v 1.6.2.1 2003/02/20 20:42:45 kan Exp $
4ce464e1 27 * $DragonFly: src/lib/libc/gen/dlfcn.c,v 1.4 2005/04/27 11:57:57 joerg Exp $
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28 */
29
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30#include <dlfcn.h>
31#include <stddef.h>
32
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33void _rtld_error(const char *, ...);
34
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35static const char sorry[] = "Service unavailable";
36
37/*
38 * For ELF, the dynamic linker directly resolves references to its
39 * services to functions inside the dynamic linker itself. These
40 * weak-symbol stubs are necessary so that "ld" won't complain about
41 * undefined symbols. The stubs are executed only when the program is
42 * linked statically, or when a given service isn't implemented in the
43 * dynamic linker. They must return an error if called, and they must
44 * be weak symbols so that the dynamic linker can override them.
45 */
46
47#pragma weak _rtld_error
48void
4ce464e1 49_rtld_error(const char *fmt __unused, ...)
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50{
51}
52
53#pragma weak dladdr
54int
4ce464e1 55dladdr(const void *addr __unused, Dl_info *dlip __unused)
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56{
57 _rtld_error(sorry);
58 return 0;
59}
60
61#pragma weak dlclose
62int
4ce464e1 63dlclose(void *handle __unused)
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64{
65 _rtld_error(sorry);
66 return -1;
67}
68
69#pragma weak dlerror
70const char *
71dlerror(void)
72{
73 return sorry;
74}
75
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76#pragma weak dlopen
77void *
4ce464e1 78dlopen(const char *name __unused, int mode __unused)
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79{
80 _rtld_error(sorry);
81 return NULL;
82}
83
84#pragma weak dlsym
85void *
4ce464e1 86dlsym(void *handle __unused, const char *name __unused)
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87{
88 _rtld_error(sorry);
89 return NULL;
90}
91
92#pragma weak dlinfo
93int
4ce464e1 94dlinfo(void *handle __unused, int request __unused, void *p __unused)
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95{
96 _rtld_error(sorry);
97 return NULL;
98}