lib/libc/dlfcn/dlfcn_elf.c

   1 /*      $NetBSD: dlfcn_elf.c,v 1.7 2010/10/16 10:27:07 skrll Exp $      */
   2
   3 /*
   4  * Copyright (c) 2000 Takuya SHIOZAKI
   5  * 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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #if defined(LIBC_SCCS) && !defined(lint)
  30 __RCSID("$NetBSD: dlfcn_elf.c,v 1.7 2010/10/16 10:27:07 skrll Exp $");
  31 #endif /* LIBC_SCCS and not lint */
  32
  33 #include "namespace.h"
  34
  35 #undef dlopen
  36 #undef dlclose
  37 #undef dlsym
  38 #undef dlerror
  39 #undef dladdr
  40 #undef dfinfo
  41
  42 #define dlopen          ___dlopen
  43 #define dlclose         ___dlclose
  44 #define dlsym           ___dlsym
  45 #define dlerror         ___dlerror
  46 #define dladdr          ___dladdr
  47 #define dlinfo          ___dlinfo
  48 #define dl_iterate_phdr         ___dl_iterate_phdr
  49
  50 #define ELFSIZE ARCH_ELFSIZE
  51 #include "rtld.h"
  52
  53 #ifdef __weak_alias
  54 __weak_alias(dlopen,___dlopen)
  55 __weak_alias(dlclose,___dlclose)
  56 __weak_alias(dlsym,___dlsym)
  57 __weak_alias(dlerror,___dlerror)
  58 __weak_alias(dladdr,___dladdr)
  59 __weak_alias(dlinfo,___dlinfo)
  60 __weak_alias(dl_iterate_phdr,___dl_iterate_phdr)
  61
  62 __weak_alias(__dlopen,___dlopen)
  63 __weak_alias(__dlclose,___dlclose)
  64 __weak_alias(__dlsym,___dlsym)
  65 __weak_alias(__dlerror,___dlerror)
  66 __weak_alias(__dladdr,___dladdr)
  67 __weak_alias(__dlinfo,___dlinfo)
  68 __weak_alias(__dl_iterate_phdr,___dl_iterate_phdr)
  69 #endif
  70
  71 /*
  72  * For ELF, the dynamic linker directly resolves references to its
  73  * services to functions inside the dynamic linker itself.  These
  74  * weak-symbol stubs are necessary so that "ld" won't complain about
  75  * undefined symbols.  The stubs are executed only when the program is
  76  * linked statically, or when a given service isn't implemented in the
  77  * dynamic linker.  They must return an error if called, and they must
  78  * be weak symbols so that the dynamic linker can override them.
  79  */
  80
  81 static char dlfcn_error[] = "Service unavailable";
  82
  83 /*ARGSUSED*/
  84 void *
  85 dlopen(const char *name, int mode)
  86 {
  87
  88         return NULL;
  89 }
  90
  91 /*ARGSUSED*/
  92 int
  93 dlclose(void *fd)
  94 {
  95
  96         return -1;
  97 }
  98
  99 /*ARGSUSED*/
 100 void *
 101 dlsym(void *handle, const char *name)
 102 {
 103
 104         return NULL;
 105 }
 106
 107 /*ARGSUSED*/
 108 __aconst char *
 109 dlerror()
 110 {
 111
 112         return dlfcn_error;
 113 }
 114
 115 /*ARGSUSED*/
 116 int
 117 dladdr(const void *addr, Dl_info *dli)
 118 {
 119
 120         return 0;
 121 }
 122
 123 /*ARGSUSED*/
 124 int
 125 dlinfo(void *handle, int req, void *v)
 126 {
 127
 128         return -1;
 129 }
 130
 131 /*ARGSUSED*/
 132 int
 133 dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
 134     void *data)
 135 {
 136
 137         return 0;
 138 }