Line data    Source code

       1             : /* Get library from table at the given index.
       2             :    Copyright (C) 2004, 2005, 2009, 2014, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 2004.
       5             : 
       6             :    This file is free software; you can redistribute it and/or modify
       7             :    it under the terms of either
       8             : 
       9             :      * the GNU Lesser General Public License as published by the Free
      10             :        Software Foundation; either version 3 of the License, or (at
      11             :        your option) any later version
      12             : 
      13             :    or
      14             : 
      15             :      * the GNU General Public License as published by the Free
      16             :        Software Foundation; either version 2 of the License, or (at
      17             :        your option) any later version
      18             : 
      19             :    or both in parallel, as here.
      20             : 
      21             :    elfutils is distributed in the hope that it will be useful, but
      22             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24             :    General Public License for more details.
      25             : 
      26             :    You should have received copies of the GNU General Public License and
      27             :    the GNU Lesser General Public License along with this program.  If
      28             :    not, see <http://www.gnu.org/licenses/>.  */
      29             : 
      30             : #ifdef HAVE_CONFIG_H
      31             : # include <config.h>
      32             : #endif
      33             : 
      34             : #include <assert.h>
      35             : #include <gelf.h>
      36             : #include <string.h>
      37             : 
      38             : #include "libelfP.h"
      39             : 
      40             : 
      41             : GElf_Lib *
      42           0 : gelf_getlib (Elf_Data *data, int ndx, GElf_Lib *dst)
      43             : {
      44           0 :   if (data == NULL)
      45             :     return NULL;
      46             : 
      47           0 :   if (unlikely (data->d_type != ELF_T_LIB))
      48             :     {
      49           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      50           0 :       return NULL;
      51             :     }
      52             : 
      53           0 :   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
      54             : 
      55             :   rwlock_rdlock (data_scn->s->elf->lock);
      56             : 
      57             :   /* The on disk format of Elf32_Lib and Elf64_Lib is identical.  So
      58             :      we can simplify things significantly.  */
      59             :   assert (sizeof (GElf_Lib) == sizeof (Elf32_Lib));
      60             :   assert (sizeof (GElf_Lib) == sizeof (Elf64_Lib));
      61             : 
      62             :   /* The data is already in the correct form.  Just make sure the
      63             :      index is OK.  */
      64           0 :   GElf_Lib *result = NULL;
      65           0 :   if (INVALID_NDX (ndx, GElf_Lib, data))
      66           0 :     __libelf_seterrno (ELF_E_INVALID_INDEX);
      67             :   else
      68             :     {
      69           0 :       *dst = ((GElf_Lib *) data->d_buf)[ndx];
      70             : 
      71           0 :       result = dst;
      72             :     }
      73             : 
      74             :   rwlock_unlock (data_scn->s->elf->lock);
      75             : 
      76           0 :   return result;
      77             : }