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 41 #define dlopen ___dlopen 42 #define dlclose ___dlclose 43 #define dlsym ___dlsym 44 #define dlerror ___dlerror 45 #define dladdr ___dladdr 46 47 #define ELFSIZE ARCH_ELFSIZE 48 #include "rtld.h" 49 50 #ifdef __weak_alias 51 __weak_alias(dlopen,___dlopen) 52 __weak_alias(dlclose,___dlclose) 53 __weak_alias(dlsym,___dlsym) 54 __weak_alias(dlerror,___dlerror) 55 __weak_alias(dladdr,___dladdr) 56 57 __weak_alias(__dlopen,___dlopen) 58 __weak_alias(__dlclose,___dlclose) 59 __weak_alias(__dlsym,___dlsym) 60 __weak_alias(__dlerror,___dlerror) 61 __weak_alias(__dladdr,___dladdr) 62 #endif 63 64 /* 65 * For ELF, the dynamic linker directly resolves references to its 66 * services to functions inside the dynamic linker itself. These 67 * weak-symbol stubs are necessary so that "ld" won't complain about 68 * undefined symbols. The stubs are executed only when the program is 69 * linked statically, or when a given service isn't implemented in the 70 * dynamic linker. They must return an error if called, and they must 71 * be weak symbols so that the dynamic linker can override them. 72 */ 73 74 static char dlfcn_error[] = "Service unavailable"; 75 76 /*ARGSUSED*/ 77 void * 78 dlopen(const char *name, int mode) 79 { 80 81 return NULL; 82 } 83 84 /*ARGSUSED*/ 85 int 86 dlclose(void *fd) 87 { 88 89 return -1; 90 } 91 92 /*ARGSUSED*/ 93 void * 94 dlsym(void *handle, const char *name) 95 { 96 97 return NULL; 98 } 99 100 /*ARGSUSED*/ 101 __aconst char * 102 dlerror() 103 { 104 105 return dlfcn_error; 106 } 107 108 /*ARGSUSED*/ 109 int 110 dladdr(const void *addr, Dl_info *dli) 111 { 112 113 return 0; 114 } 115