lib/libc/dlfcn/dlfcn_elf.c

   1 /*      $NetBSD: dlfcn_elf.c,v 1.5 2004/07/18 17:26:19 thorpej 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 1.5 2004/07/18 17:26:19 thorpej 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
  49 #define ELFSIZE ARCH_ELFSIZE
  50 #include "rtld.h"
  51
  52 #ifdef __weak_alias
  53 __weak_alias(dlopen,___dlopen)
  54 __weak_alias(dlclose,___dlclose)
  55 __weak_alias(dlsym,___dlsym)
  56 __weak_alias(dlerror,___dlerror)
  57 __weak_alias(dladdr,___dladdr)
  58 __weak_alias(dlinfo,___dlinfo)
  59
  60 __weak_alias(__dlopen,___dlopen)
  61 __weak_alias(__dlclose,___dlclose)
  62 __weak_alias(__dlsym,___dlsym)
  63 __weak_alias(__dlerror,___dlerror)
  64 __weak_alias(__dladdr,___dladdr)
  65 __weak_alias(__dlinfo,___dlinfo)
  66 #endif
  67
  68 /*
  69  * For ELF, the dynamic linker directly resolves references to its
  70  * services to functions inside the dynamic linker itself.  These
  71  * weak-symbol stubs are necessary so that "ld" won't complain about
  72  * undefined symbols.  The stubs are executed only when the program is
  73  * linked statically, or when a given service isn't implemented in the
  74  * dynamic linker.  They must return an error if called, and they must
  75  * be weak symbols so that the dynamic linker can override them.
  76  */
  77
  78 static char dlfcn_error[] = "Service unavailable";
  79
  80 /*ARGSUSED*/
  81 void *
  82 dlopen(const char *name, int mode)
  83 {
  84
  85         return NULL;
  86 }
  87
  88 /*ARGSUSED*/
  89 int
  90 dlclose(void *fd)
  91 {
  92
  93         return -1;
  94 }
  95
  96 /*ARGSUSED*/
  97 void *
  98 dlsym(void *handle, const char *name)
  99 {
 100
 101         return NULL;
 102 }
 103
 104 /*ARGSUSED*/
 105 __aconst char *
 106 dlerror()
 107 {
 108
 109         return dlfcn_error;
 110 }
 111
 112 /*ARGSUSED*/
 113 int
 114 dladdr(const void *addr, Dl_info *dli)
 115 {
 116
 117         return 0;
 118 }
 119
 120 /*ARGSUSED*/
 121 int
 122 dlinfo(void *handle, int req, void *v)
 123 {
 124
 125         return -1;
 126 }