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glibc  2.9
dladdr1.c
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00001 /* Locate the shared object symbol nearest a given address.
00002    Copyright (C) 2003, 2004 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <dlfcn.h>
00021 
00022 #if !defined SHARED && defined IS_IN_libdl
00023 
00024 int
00025 dladdr1 (const void *address, Dl_info *info, void **extra, int flags)
00026 {
00027   return __dladdr1 (address, info, extra, flags);
00028 }
00029 
00030 #else
00031 
00032 int
00033 __dladdr1 (const void *address, Dl_info *info, void **extra, int flags)
00034 {
00035 # ifdef SHARED
00036   if (__builtin_expect (_dlfcn_hook != NULL, 0))
00037     return _dlfcn_hook->dladdr1 (address, info, extra, flags);
00038 # endif
00039 
00040   switch (flags)
00041     {
00042     default:                /* Make this an error?  */
00043     case 0:
00044       return _dl_addr (address, info, NULL, NULL);
00045     case RTLD_DL_SYMENT:
00046       return _dl_addr (address, info, NULL, (const ElfW(Sym) **) extra);
00047     case RTLD_DL_LINKMAP:
00048       return _dl_addr (address, info, (struct link_map **) extra, NULL);
00049     }
00050 }
00051 # ifdef SHARED
00052 strong_alias (__dladdr1, dladdr1)
00053 # endif
00054 #endif