Home | History | Annotate | Line # | Download | only in dlfcn
dlfcn_elf.c revision 1.4 
      1 /*	$NetBSD: dlfcn_elf.c,v 1.4 2003/08/12 09:18:43 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 1.4 2003/08/12 09:18:43 skrll Exp $");
     31 #endif /* LIBC_SCCS and not lint */
     32 
     33 #include "namespace.h"
     34 
     35 #define ELFSIZE ARCH_ELFSIZE
     36 #include "rtld.h"
     37 
     38 #ifdef __weak_alias
     39 __weak_alias(dlopen,__dlopen)
     40 __weak_alias(dlclose,__dlclose)
     41 __weak_alias(dlsym,__dlsym)
     42 __weak_alias(dlerror,__dlerror)
     43 __weak_alias(dladdr,__dladdr)
     44 #endif
     45 
     46 /*
     47  * For ELF, the dynamic linker directly resolves references to its
     48  * services to functions inside the dynamic linker itself.  These
     49  * weak-symbol stubs are necessary so that "ld" won't complain about
     50  * undefined symbols.  The stubs are executed only when the program is
     51  * linked statically, or when a given service isn't implemented in the
     52  * dynamic linker.  They must return an error if called, and they must
     53  * be weak symbols so that the dynamic linker can override them.
     54  */
     55 
     56 static char dlfcn_error[] = "Service unavailable";
     57 
     58 /*ARGSUSED*/
     59 void *
     60 dlopen(const char *name, int mode)
     61 {
     62 
     63 	return NULL;
     64 }
     65 
     66 /*ARGSUSED*/
     67 int
     68 dlclose(void *fd)
     69 {
     70 
     71 	return -1;
     72 }
     73 
     74 /*ARGSUSED*/
     75 void *
     76 dlsym(void *handle, const char *name)
     77 {
     78 
     79 	return NULL;
     80 }
     81 
     82 /*ARGSUSED*/
     83 __aconst char *
     84 dlerror()
     85 {
     86 
     87 	return dlfcn_error;
     88 }
     89 
     90 /*ARGSUSED*/
     91 int
     92 dladdr(const void *addr, Dl_info *dli)
     93 {
     94 
     95 	return 0;
     96 }
     97