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       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                 :         32 : elf_clone (Elf *elf, Elf_Cmd cmd)
      42                 :            : {
      43                 :         32 :   Elf *retval = NULL;
      44                 :            : 
      45         [ +  - ]:         32 :   if (elf == NULL)
      46                 :            :     /* Some earlier mistake.  */
      47                 :            :     return NULL;
      48                 :            : 
      49                 :            :   /* Make sure the descriptor is not suddenly going away.  */
      50                 :         32 :   rwlock_rdlock (elf->lock);
      51                 :            : 
      52         [ +  - ]:         32 :   if (cmd != ELF_C_EMPTY)
      53                 :            :     // XXX TODO handle ELF_C_READ/WRITE etc
      54                 :            :     goto out;
      55                 :            : 
      56                 :         96 :   retval = allocate_elf (elf->fildes, elf->map_address, elf->start_offset,
      57                 :            :                          elf->maximum_size, elf->cmd, elf->parent, elf->kind,
      58                 :         32 :                          elf->state.elf32.scns.max * sizeof (Elf_Scn));
      59         [ -  + ]:         32 :   if (retval != NULL)
      60                 :            :     {
      61                 :            :       /* We have to write to the file in any case.  */
      62                 :         32 :       retval->flags = ELF_F_DIRTY;
      63                 :            : 
      64                 :            :       /* Some more or less arbitrary value.  */
      65                 :         32 :       retval->state.elf.scnincr = 10;
      66                 :            : 
      67                 :            :       /* We have allocated room for some sections.  */
      68                 :         32 :       assert (offsetof (struct Elf, state.elf32.scns)
      69                 :            :               == offsetof (struct Elf, state.elf64.scns));
      70                 :         32 :       retval->state.elf.scns_last = &retval->state.elf32.scns;
      71                 :         32 :       retval->state.elf32.scns.max = elf->state.elf32.scns.max;
      72                 :            : 
      73                 :         32 :       retval->class = elf->class;
      74                 :            :     }
      75                 :            : 
      76                 :            :   /* Release the lock.  */
      77                 :          0 :  out:
      78                 :            :   rwlock_unlock (elf->lock);
      79                 :            : 
      80                 :            :   return retval;
      81                 :            : }