libc: Fix some more -Wmissing-prototype.
[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 *
fcf53d9b 26 * $FreeBSD: src/lib/libc/gen/dlfcn.c 217154 2011-01-08 17:13:43Z kib $
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27 */
28
e9de6dcc 29#include <sys/mman.h>
984263bc 30#include <dlfcn.h>
fcf53d9b 31#include <link.h>
984263bc 32#include <stddef.h>
e3b4bb34 33#include <string.h>
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34#include "libc_private.h"
35
36struct dl_phdr_info build_phdr_info(void);
37void _rtld_thread_childfork(void);
38void _rtld_thread_init(void *);
39void _rtld_thread_postfork(void);
40void _rtld_thread_prefork(void);
984263bc 41
f0a144b4 42extern char **environ;
4ce464e1 43
fcf53d9b 44static char sorry[] = "Service unavailable";
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45
46/*
47 * For ELF, the dynamic linker directly resolves references to its
48 * services to functions inside the dynamic linker itself. These
49 * weak-symbol stubs are necessary so that "ld" won't complain about
50 * undefined symbols. The stubs are executed only when the program is
51 * linked statically, or when a given service isn't implemented in the
52 * dynamic linker. They must return an error if called, and they must
53 * be weak symbols so that the dynamic linker can override them.
54 */
55
56#pragma weak _rtld_error
57void
4ce464e1 58_rtld_error(const char *fmt __unused, ...)
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59{
60}
61
62#pragma weak dladdr
63int
4ce464e1 64dladdr(const void *addr __unused, Dl_info *dlip __unused)
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65{
66 _rtld_error(sorry);
67 return 0;
68}
69
70#pragma weak dlclose
71int
4ce464e1 72dlclose(void *handle __unused)
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73{
74 _rtld_error(sorry);
75 return -1;
76}
77
78#pragma weak dlerror
fcf53d9b 79char *
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80dlerror(void)
81{
82 return sorry;
83}
84
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85#pragma weak dlopen
86void *
4ce464e1 87dlopen(const char *name __unused, int mode __unused)
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88{
89 _rtld_error(sorry);
90 return NULL;
91}
92
93#pragma weak dlsym
94void *
4ce464e1 95dlsym(void *handle __unused, const char *name __unused)
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96{
97 _rtld_error(sorry);
98 return NULL;
99}
100
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101#pragma weak dlfunc
102dlfunc_t
103dlfunc(void * handle __unused, const char * name __unused)
104{
105 _rtld_error(sorry);
106 return NULL;
107}
108
109#pragma weak dlvsym
110void *
111dlvsym(void *handle __unused,const char *name __unused,
112 const char *version __unused)
113{
114 _rtld_error(sorry);
115 return NULL;
116}
117
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118#pragma weak _rtld_thread_init
119void
5dcdf778 120_rtld_thread_init(void * li __unused)
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121{
122 _rtld_error(sorry);
123}
124
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125#pragma weak dlinfo
126int
4ce464e1 127dlinfo(void *handle __unused, int request __unused, void *p __unused)
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128{
129 _rtld_error(sorry);
3641b7ca 130 return 0;
984263bc 131}
fcf53d9b 132
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133__dso_hidden struct dl_phdr_info
134build_phdr_info(void)
135{
136 struct dl_phdr_info phdr_info;
137 Elf_Addr *sp;
138 Elf_Auxinfo *aux, *auxp;
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139 unsigned int i;
140
141 sp = (Elf_Addr *) environ;
142 while (*sp++ != 0)
143 ;
144 aux = (Elf_Auxinfo *) sp;
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145 memset (&phdr_info, 0, sizeof(phdr_info));
146 for (auxp = aux; auxp->a_type != AT_NULL; auxp++) {
147 switch (auxp->a_type) {
148 case AT_BASE:
149 phdr_info.dlpi_addr = (Elf_Addr) auxp->a_un.a_ptr;
150 break;
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151 case AT_EXECPATH:
152 phdr_info.dlpi_name = (const char *) auxp->a_un.a_ptr;
153 break;
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154 case AT_PHDR:
155 phdr_info.dlpi_phdr = (const Elf_Phdr *) auxp->a_un.a_ptr;
156 break;
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157 case AT_PHNUM:
158 phdr_info.dlpi_phnum = (Elf_Half) auxp->a_un.a_val;
159 break;
160 }
161 }
162
163 for (i = 0; i < phdr_info.dlpi_phnum; i++)
164 if (phdr_info.dlpi_phdr[i].p_type == PT_TLS) {
165 phdr_info.dlpi_tls_modid = 1;
166 phdr_info.dlpi_tls_data =
752fcd15 167 (void*)phdr_info.dlpi_phdr[i].p_vaddr;
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168 }
169
170 return (phdr_info);
171}
172
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173#pragma weak dl_iterate_phdr
174int
175dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
176 void *data)
177{
e3b4bb34 178 static int seen = 0;
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179 static struct dl_phdr_info phdr_info;
180 if (!seen) {
181 seen = 1;
182 phdr_info = build_phdr_info();
183 }
184
185 return callback(&phdr_info, sizeof(phdr_info), data);
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186}
187
d679f65e 188#pragma weak fdlopen
303c1887 189void *
6d7019e6 190fdlopen(int fd __unused, int mode __unused)
303c1887 191{
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192 _rtld_error(sorry);
193 return NULL;
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194}
195
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196#pragma weak _rtld_addr_phdr
197int
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198_rtld_addr_phdr(const void *addr __unused,
199 struct dl_phdr_info *phdr_info __unused)
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200{
201
202 return (0);
203}
204
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205#pragma weak _rtld_get_stack_prot
206int
207_rtld_get_stack_prot(void)
208{
209 return (PROT_EXEC | PROT_READ | PROT_WRITE);
210}
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211
212#pragma weak _rtld_thread_prefork
213void
214_rtld_thread_prefork(void)
215{
216}
217
218#pragma weak _rtld_thread_postfork
219void
220_rtld_thread_postfork(void)
221{
222}
223
224#pragma weak _rtld_thread_childfork
225void
226_rtld_thread_childfork(void)
227{
228}