Line data    Source code

       1             : /* Create clone of a given descriptor.
       2             :    Copyright (C) 2003, 2004 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 2003.
       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 <stddef.h>
      36             : #include "libelfP.h"
      37             : #include "common.h"
      38             : 
      39             : 
      40             : Elf *
      41          16 : elf_clone (Elf *elf, Elf_Cmd cmd)
      42             : {
      43          16 :   Elf *retval = NULL;
      44             : 
      45          16 :   if (elf == NULL)
      46             :     /* Some earlier mistake.  */
      47             :     return NULL;
      48             : 
      49             :   /* Make sure the descriptor is not suddenly going away.  */
      50             :   rwlock_rdlock (elf->lock);
      51             : 
      52          16 :   if (cmd != ELF_C_EMPTY)
      53             :     // XXX TODO handle ELF_C_READ/WRITE etc
      54             :     goto out;
      55             : 
      56          16 :   retval = allocate_elf (elf->fildes, elf->map_address, elf->start_offset,
      57             :                          elf->maximum_size, elf->cmd, elf->parent, elf->kind,
      58          16 :                          elf->state.elf32.scns.max * sizeof (Elf_Scn));
      59          16 :   if (retval != NULL)
      60             :     {
      61             :       /* We have to write to the file in any case.  */
      62          16 :       retval->flags = ELF_F_DIRTY;
      63             : 
      64             :       /* Some more or less arbitrary value.  */
      65          16 :       retval->state.elf.scnincr = 10;
      66             : 
      67             :       /* We have allocated room for some sections.  */
      68             :       assert (offsetof (struct Elf, state.elf32.scns)
      69             :               == offsetof (struct Elf, state.elf64.scns));
      70          16 :       retval->state.elf.scns_last = &retval->state.elf32.scns;
      71          16 :       retval->state.elf32.scns.max = elf->state.elf32.scns.max;
      72             : 
      73          16 :       retval->class = elf->class;
      74             :     }
      75             : 
      76             :   /* Release the lock.  */
      77           0 :  out:
      78             :   rwlock_unlock (elf->lock);
      79             : 
      80             :   return retval;
      81             : }