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       1                 :            : /* Creates an ELF handle from a possibly compressed file descriptor.
       2                 :            :    Copyright (C) 2018 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            : 
       5                 :            :    This file is free software; you can redistribute it and/or modify
       6                 :            :    it under the terms of either
       7                 :            : 
       8                 :            :      * the GNU Lesser General Public License as published by the Free
       9                 :            :        Software Foundation; either version 3 of the License, or (at
      10                 :            :        your option) any later version
      11                 :            : 
      12                 :            :    or
      13                 :            : 
      14                 :            :      * the GNU General Public License as published by the Free
      15                 :            :        Software Foundation; either version 2 of the License, or (at
      16                 :            :        your option) any later version
      17                 :            : 
      18                 :            :    or both in parallel, as here.
      19                 :            : 
      20                 :            :    elfutils is distributed in the hope that it will be useful, but
      21                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23                 :            :    General Public License for more details.
      24                 :            : 
      25                 :            :    You should have received copies of the GNU General Public License and
      26                 :            :    the GNU Lesser General Public License along with this program.  If
      27                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      28                 :            : 
      29                 :            : #ifdef HAVE_CONFIG_H
      30                 :            : # include <config.h>
      31                 :            : #endif
      32                 :            : 
      33                 :            : #include "libdwelfP.h"
      34                 :            : #include "libdwflP.h"
      35                 :            : #include "libelfP.h"
      36                 :            : 
      37                 :            : #include <unistd.h>
      38                 :            : 
      39                 :            : Elf *
      40                 :         73 : dwelf_elf_begin (int fd)
      41                 :            : {
      42                 :         73 :   Elf *elf = NULL;
      43                 :         73 :   Dwfl_Error e = __libdw_open_elf (fd, &elf);
      44         [ +  - ]:         73 :   if (e == DWFL_E_NOERROR)
      45                 :         73 :     return elf;
      46                 :            : 
      47                 :            :   /* Elf wasn't usable.  Make sure there is a proper elf error
      48                 :            :      message.  This is probably not the real error, because there is
      49                 :            :      no good way to propagate errnos or decompression errors, but
      50                 :            :      better than nothing.  */
      51                 :            : 
      52         [ #  # ]:          0 :   if (e != DWFL_E_LIBELF)
      53                 :            :     {
      54                 :            :       /* Force a bad ELF error.  */
      55                 :          0 :       char badelf[EI_NIDENT] = { };
      56                 :          0 :       Elf *belf = elf_memory (badelf, EI_NIDENT);
      57                 :          0 :       elf32_getehdr (belf);
      58                 :          0 :       elf_end (belf);
      59                 :            :     }
      60                 :            : 
      61                 :            :   return NULL;
      62                 :            : }
      63                 :            : OLD_VERSION (dwelf_elf_begin, ELFUTILS_0.175)
      64                 :            : NEW_VERSION (dwelf_elf_begin, ELFUTILS_0.177)