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      1 /* Update required symbol version information.
      2    Copyright (C) 2001, 2002 Red Hat, Inc.
      3    Written by Ulrich Drepper <drepper (at) redhat.com>, 2001.
      4 
      5    This program is free software; you can redistribute it and/or modify
      6    it under the terms of the GNU General Public License as published by
      7    the Free Software Foundation, version 2.
      8 
      9    This program is distributed in the hope that it will be useful,
     10    but WITHOUT ANY WARRANTY; without even the implied warranty of
     11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     12    GNU General Public License for more details.
     13 
     14    You should have received a copy of the GNU General Public License
     15    along with this program; if not, write to the Free Software Foundation,
     16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
     17 
     18 #ifdef HAVE_CONFIG_H
     19 # include <config.h>
     20 #endif
     21 
     22 #include <assert.h>
     23 #include <gelf.h>
     24 #include <string.h>
     25 
     26 #include "libelfP.h"
     27 
     28 
     29 int
     30 gelf_update_verneed (data, offset, src)
     31      Elf_Data *data;
     32      int offset;
     33      GElf_Verneed *src;
     34 {
     35   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
     36 
     37   if (data == NULL)
     38     return 0;
     39 
     40   /* The types for 32 and 64 bit are the same.  Lucky us.  */
     41   assert (sizeof (GElf_Verneed) == sizeof (Elf32_Verneed));
     42   assert (sizeof (GElf_Verneed) == sizeof (Elf64_Verneed));
     43 
     44   /* Check whether we have to resize the data buffer.  */
     45   if (unlikely (offset < 0)
     46       || unlikely ((offset + sizeof (GElf_Verneed)) > data_scn->d.d_size))
     47     {
     48       __libelf_seterrno (ELF_E_INVALID_INDEX);
     49       return 0;
     50     }
     51 
     52   if (unlikely (data_scn->d.d_type != ELF_T_VNEED))
     53     {
     54       /* The type of the data better should match.  */
     55       __libelf_seterrno (ELF_E_DATA_MISMATCH);
     56       return 0;
     57     }
     58 
     59   rwlock_wrlock (data_scn->s->elf->lock);
     60 
     61   memcpy ((char *) data_scn->d.d_buf + offset, src, sizeof (GElf_Verneed));
     62 
     63   /* Mark the section as modified.  */
     64   data_scn->s->flags |= ELF_F_DIRTY;
     65 
     66   rwlock_unlock (data_scn->s->elf->lock);
     67 
     68   return 1;
     69 }
     70