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dlfcn_elf.c revision 1.5.40.1 
      1 /*	$NetBSD: dlfcn_elf.c,v 1.5.40.1 2010/04/21 05:28:08 matt 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 1.5.40.1 2010/04/21 05:28:08 matt 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 }
    127