diff options
Diffstat (limited to 'lib/libc/gen/dlfcn.c')
| -rw-r--r-- | lib/libc/gen/dlfcn.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/lib/libc/gen/dlfcn.c b/lib/libc/gen/dlfcn.c deleted file mode 100644 index fd0be34..0000000 --- a/lib/libc/gen/dlfcn.c +++ /dev/null @@ -1,182 +0,0 @@ -/*- - * Copyright (c) 1998 John D. Polstra - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $FreeBSD$ - */ - -/* - * Linkage to services provided by the dynamic linker. These are - * implemented differently in ELF and a.out, because the dynamic - * linkers have different interfaces. - */ - -#ifdef __ELF__ - -#include <dlfcn.h> -#include <stddef.h> - -static const char sorry[] = "Service unavailable"; - -/* - * For ELF, the dynamic linker directly resolves references to its - * services to functions inside the dynamic linker itself. These - * weak-symbol stubs are necessary so that "ld" won't complain about - * undefined symbols. The stubs are executed only when the program is - * linked statically, or when a given service isn't implemented in the - * dynamic linker. They must return an error if called, and they must - * be weak symbols so that the dynamic linker can override them. - */ - -#pragma weak _rtld_error -void -_rtld_error(const char *fmt, ...) -{ -} - -#pragma weak dladdr -int -dladdr(const void *addr, Dl_info *dlip) -{ - _rtld_error(sorry); - return 0; -} - -#pragma weak dlclose -int -dlclose(void *handle) -{ - _rtld_error(sorry); - return -1; -} - -#pragma weak dlerror -const char * -dlerror(void) -{ - return sorry; -} - -#pragma weak dllockinit -void -dllockinit(void *context, - void *(*lock_create)(void *context), - void (*rlock_acquire)(void *lock), - void (*wlock_acquire)(void *lock), - void (*lock_release)(void *lock), - void (*lock_destroy)(void *lock), - void (*context_destroy)(void *context)) -{ - if (context_destroy != NULL) - context_destroy(context); -} - -#pragma weak dlopen -void * -dlopen(const char *name, int mode) -{ - _rtld_error(sorry); - return NULL; -} - -#pragma weak dlsym -void * -dlsym(void *handle, const char *name) -{ - _rtld_error(sorry); - return NULL; -} - -#else /* a.out format */ - -#include <sys/types.h> -#include <nlist.h> /* XXX - Required by link.h */ -#include <dlfcn.h> -#include <link.h> -#include <stddef.h> - -/* - * For a.out, entry to the dynamic linker is via these trampolines. - * They enter the dynamic linker through the ld_entry struct that was - * passed back from the dynamic linker at startup time. - */ - -/* GCC is needed because we use its __builtin_return_address construct. */ - -#ifndef __GNUC__ -#error "GCC is needed to compile this file" -#endif - -/* - * These variables are set by code in crt0.o. For compatibility with - * old executables, they must be common, not extern. - */ -struct ld_entry *__ldso_entry; /* Entry points to dynamic linker */ -int __ldso_version; /* Dynamic linker version number */ - -int -dladdr(const void *addr, Dl_info *dlip) -{ - if (__ldso_entry == NULL || __ldso_version < LDSO_VERSION_HAS_DLADDR) - return 0; - return (__ldso_entry->dladdr)(addr, dlip); -} - -int -dlclose(void *handle) -{ - if (__ldso_entry == NULL) - return -1; - return (__ldso_entry->dlclose)(handle); -} - -const char * -dlerror(void) -{ - if (__ldso_entry == NULL) - return "Service unavailable"; - return (__ldso_entry->dlerror)(); -} - -void * -dlopen(const char *name, int mode) -{ - if (__ldso_entry == NULL) - return NULL; - return (__ldso_entry->dlopen)(name, mode); -} - -void * -dlsym(void *handle, const char *name) -{ - if (__ldso_entry == NULL) - return NULL; - if (__ldso_version >= LDSO_VERSION_HAS_DLSYM3) { - void *retaddr = __builtin_return_address(0); /* __GNUC__ only */ - return (__ldso_entry->dlsym3)(handle, name, retaddr); - } else - return (__ldso_entry->dlsym)(handle, name); -} - -#endif /* __ELF__ */ |
