Line data    Source code

       1             : /* Create descriptor from file descriptor for processing file.
       2             :    Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 2002.
       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 <errno.h>
      35             : #include <stddef.h>
      36             : #include <sys/stat.h>
      37             : 
      38             : #include <libdwP.h>
      39             : 
      40             : 
      41             : Dwarf *
      42          46 : dwarf_begin (int fd, Dwarf_Cmd cmd)
      43             : {
      44             :   Elf *elf;
      45             :   Elf_Cmd elfcmd;
      46          46 :   Dwarf *result = NULL;
      47             : 
      48          46 :   switch (cmd)
      49             :     {
      50             :     case DWARF_C_READ:
      51             :       elfcmd = ELF_C_READ_MMAP;
      52             :       break;
      53             :     case DWARF_C_WRITE:
      54           0 :       elfcmd = ELF_C_WRITE;
      55           0 :       break;
      56             :     case DWARF_C_RDWR:
      57           0 :       elfcmd = ELF_C_RDWR;
      58           0 :       break;
      59             :     default:
      60             :       /* No valid mode.  */
      61           0 :       __libdw_seterrno (DWARF_E_INVALID_CMD);
      62           0 :       return NULL;
      63             :     }
      64             : 
      65             :   /* We have to call `elf_version' here since the user might have not
      66             :      done it or initialized libelf with a different version.  This
      67             :      would break libdwarf since we are using the ELF data structures
      68             :      in a certain way.  */
      69          46 :   elf_version (EV_CURRENT);
      70             : 
      71             :   /* Get an ELF descriptor.  */
      72          46 :   elf = elf_begin (fd, elfcmd, NULL);
      73          46 :   if (elf == NULL)
      74             :     {
      75             :       /* Test why the `elf_begin" call failed.  */
      76             :       struct stat st;
      77             : 
      78           0 :       if (fstat (fd, &st) == 0 && ! S_ISREG (st.st_mode))
      79           0 :         __libdw_seterrno (DWARF_E_NO_REGFILE);
      80           0 :       else if (errno == EBADF)
      81           0 :         __libdw_seterrno (DWARF_E_INVALID_FILE);
      82             :       else
      83           0 :         __libdw_seterrno (DWARF_E_IO_ERROR);
      84             :     }
      85             :   else
      86             :     {
      87             :       /* Do the real work now that we have an ELF descriptor.  */
      88          46 :       result = INTUSE(dwarf_begin_elf) (elf, cmd, NULL);
      89             : 
      90             :       /* If this failed, free the resources.  */
      91          46 :       if (result == NULL)
      92           0 :         elf_end (elf);
      93             :       else
      94          46 :         result->free_elf = true;
      95             :     }
      96             : 
      97             :   return result;
      98             : }
      99             : INTDEF(dwarf_begin)