Line data    Source code

       1             : /* Control an ELF file desrciptor.
       2             :    Copyright (C) 1998, 1999, 2000, 2002, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 1998.
       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 <unistd.h>
      35             : 
      36             : #include "libelfP.h"
      37             : 
      38             : 
      39             : int
      40         648 : elf_cntl (Elf *elf, Elf_Cmd cmd)
      41             : {
      42         648 :   int result = 0;
      43             : 
      44         648 :   if (elf == NULL)
      45             :     return -1;
      46             : 
      47         648 :   if (elf->fildes == -1)
      48             :     {
      49           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      50           0 :       return -1;
      51             :     }
      52             : 
      53             :   rwlock_wrlock (elf->lock);
      54             : 
      55         648 :   switch (cmd)
      56             :     {
      57         479 :     case ELF_C_FDREAD:
      58             :       /* If not all of the file is in the memory read it now.  */
      59         479 :       if (elf->map_address == NULL && __libelf_readall (elf) == NULL)
      60             :         {
      61             :           /* We were not able to read everything.  */
      62             :           result = -1;
      63             :           break;
      64             :         }
      65             :       FALLTHROUGH;
      66             : 
      67             :     case ELF_C_FDDONE:
      68             :       /* Mark the file descriptor as not usable.  */
      69         648 :       elf->fildes = -1;
      70         648 :       break;
      71             : 
      72           0 :     default:
      73           0 :       __libelf_seterrno (ELF_E_INVALID_CMD);
      74           0 :       result = -1;
      75           0 :       break;
      76             :     }
      77             : 
      78             :   rwlock_unlock (elf->lock);
      79             : 
      80             :   return result;
      81             : }