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glibc  2.9
dl-sym.c
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00001 /* Copyright (C) 2001 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdarg.h>
00020 #include <stdlib.h>
00021 #include <sys/types.h>
00022 #include <errno.h>
00023 #include <dlfcn.h>
00024 #include <dlldr.h>
00025 
00026 extern int _dl_numso;
00027 extern DL_SODATA *_dl_sotable;
00028 
00029 void *
00030 _dl_sym (void *handle, const char *symbol, void *who)
00031 {
00032   void *rt_function;
00033 
00034   if ((int) handle < 0 || (int) handle >= _dl_numso || _dl_sotable == NULL)
00035     {
00036       errno = EINVAL;
00037       return NULL;
00038     }
00039 
00040   switch (_dl_sotable[(int) handle].type)
00041     {
00042     case DL_UNIX_SYSCALL:
00043       rt_function = (void *) __loadx (DL_UNIX_SYSCALL, (void *) symbol);
00044       break;
00045 
00046     case DL_GETSYM:
00047       rt_function = (void *) __loadx (DL_GETSYM, (void *) symbol,
00048                                   _dl_sotable[(int) handle].index,
00049                                   _dl_sotable[(int) handle].dataorg);
00050       break;
00051 
00052     default:
00053       errno = EINVAL;
00054       return NULL;
00055     }
00056 
00057   return rt_function;
00058 }