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