1 /* $NetBSD: dlfcn_elf.c,v 1.6 2009/09/24 21:21:33 pooka 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 1.6 2009/09/24 21:21:33 pooka 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