libelf/elf_cntl.c

/* Control an ELF file desrciptor.
   Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
   Written by Ulrich Drepper <drepper@redhat.com>, 1998.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, version 2.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <unistd.h>

#include "libelfP.h"


int
elf_cntl (elf, cmd)
     Elf *elf;
     Elf_Cmd cmd;
{
  int result = 0;

  if (elf == NULL)
    return -1;

  if (elf->fildes == -1)
    {
      __libelf_seterrno (ELF_E_INVALID_HANDLE);
      return -1;
    }

  rwlock_wrlock (elf->lock);

  switch (cmd)
    {
    case ELF_C_FDREAD:
      /* If not all of the file is in the memory read it now.  */
      if (elf->map_address == NULL && __libelf_readall (elf) == NULL)
	{
	  /* We were not able to read everything.  */
	  result = -1;
	  break;
	}
      /* FALLTHROUGH */

    case ELF_C_FDDONE:
      /* Mark the file descriptor as not usable.  */
      elf->fildes = -1;
      break;

    default:
      __libelf_seterrno (ELF_E_INVALID_CMD);
      result = -1;
      break;
    }

  rwlock_unlock (elf->lock);

  return result;
}