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dlfcn_elf.c revision 1.7 
      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 }
    139