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dlfcn.c (229768) dlfcn.c (231868)
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

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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
27#include <sys/cdefs.h>
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

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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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libc/gen/dlfcn.c 229768 2012-01-07 10:33:01Z kib $");
28__FBSDID("$FreeBSD: head/lib/libc/gen/dlfcn.c 231868 2012-02-17 10:49:29Z kib $");
29
30/*
31 * Linkage to services provided by the dynamic linker.
32 */
33#include <sys/mman.h>
34#include <dlfcn.h>
35#include <link.h>
36#include <stddef.h>
29
30/*
31 * Linkage to services provided by the dynamic linker.
32 */
33#include <sys/mman.h>
34#include <dlfcn.h>
35#include <link.h>
36#include <stddef.h>
37#include "namespace.h"
38#include <pthread.h>
39#include "un-namespace.h"
40#include "libc_private.h"
37
38static char sorry[] = "Service unavailable";
39
40/*
41 * For ELF, the dynamic linker directly resolves references to its
42 * services to functions inside the dynamic linker itself. These
43 * weak-symbol stubs are necessary so that "ld" won't complain about
44 * undefined symbols. The stubs are executed only when the program is

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133
134#pragma weak _rtld_thread_init
135void
136_rtld_thread_init(void * li)
137{
138 _rtld_error(sorry);
139}
140
41
42static char sorry[] = "Service unavailable";
43
44/*
45 * For ELF, the dynamic linker directly resolves references to its
46 * services to functions inside the dynamic linker itself. These
47 * weak-symbol stubs are necessary so that "ld" won't complain about
48 * undefined symbols. The stubs are executed only when the program is

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137
138#pragma weak _rtld_thread_init
139void
140_rtld_thread_init(void * li)
141{
142 _rtld_error(sorry);
143}
144
145static pthread_once_t dl_phdr_info_once = PTHREAD_ONCE_INIT;
146static struct dl_phdr_info phdr_info;
147
148static void
149dl_init_phdr_info(void)
150{
151 Elf_Auxinfo *auxp;
152 size_t phent;
153 unsigned int i;
154
155 phent = 0;
156 for (auxp = __elf_aux_vector; auxp->a_type != AT_NULL; auxp++) {
157 switch (auxp->a_type) {
158 case AT_BASE:
159 phdr_info.dlpi_addr = (Elf_Addr)auxp->a_un.a_ptr;
160 break;
161 case AT_EXECPATH:
162 phdr_info.dlpi_name = (const char *)auxp->a_un.a_ptr;
163 break;
164 case AT_PHDR:
165 phdr_info.dlpi_phdr =
166 (const Elf_Phdr *)auxp->a_un.a_ptr;
167 break;
168 case AT_PHENT:
169 phent = auxp->a_un.a_val;
170 break;
171 case AT_PHNUM:
172 phdr_info.dlpi_phnum = (Elf_Half)auxp->a_un.a_val;
173 break;
174 }
175 }
176 for (i = 0; i < phdr_info.dlpi_phnum; i++) {
177 if (phdr_info.dlpi_phdr[i].p_type == PT_TLS) {
178 phdr_info.dlpi_tls_modid = 1;
179 phdr_info.dlpi_tls_data =
180 (void*)phdr_info.dlpi_phdr[i].p_vaddr;
181 }
182 }
183 phdr_info.dlpi_adds = 1;
184}
185
141#pragma weak dl_iterate_phdr
142int
143dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
144 void *data)
145{
186#pragma weak dl_iterate_phdr
187int
188dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
189 void *data)
190{
146 _rtld_error(sorry);
147 return 0;
191
192 __init_elf_aux_vector();
193 if (__elf_aux_vector == NULL)
194 return (1);
195 _once(&dl_phdr_info_once, dl_init_phdr_info);
196 return (callback(&phdr_info, sizeof(phdr_info), data));
148}
149
150#pragma weak fdlopen
151void *
152fdlopen(int fd, int mode)
153{
154
155 _rtld_error(sorry);

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198
199#pragma weak fdlopen
200void *
201fdlopen(int fd, int mode)
202{
203
204 _rtld_error(sorry);

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