opncls.c

来自「基于4个mips核的noc设计」· C语言 代码 · 共 685 行 · 第 1/2 页

/* opncls.c -- open and close a BFD.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
   2001
   Free Software Foundation, Inc.

   Written by Cygnus Support.

This file is part of BFD, the Binary File Descriptor library.

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; either version 2 of the License, or
(at your option) any later version.

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.  */

#include "bfd.h"
#include "sysdep.h"
#include "objalloc.h"
#include "libbfd.h"

#ifndef S_IXUSR
#define S_IXUSR 0100	/* Execute by owner.  */
#endif
#ifndef S_IXGRP
#define S_IXGRP 0010	/* Execute by group.  */
#endif
#ifndef S_IXOTH
#define S_IXOTH 0001	/* Execute by others.  */
#endif

/* fdopen is a loser -- we should use stdio exclusively.  Unfortunately
   if we do that we can't use fcntl.  */

/* FIXME: This is no longer used.  */
long _bfd_chunksize = -1;

/* Return a new BFD.  All BFD's are allocated through this routine.  */

bfd *
_bfd_new_bfd ()
{
  bfd *nbfd;

  nbfd = (bfd *) bfd_zmalloc (sizeof (bfd));
  if (nbfd == NULL)
    return NULL;

  nbfd->memory = (PTR) objalloc_create ();
  if (nbfd->memory == NULL)
    {
      bfd_set_error (bfd_error_no_memory);
      return NULL;
    }

  nbfd->arch_info = &bfd_default_arch_struct;

  nbfd->direction = no_direction;
  nbfd->iostream = NULL;
  nbfd->where = 0;
  nbfd->sections = (asection *) NULL;
  nbfd->format = bfd_unknown;
  nbfd->my_archive = (bfd *) NULL;
  nbfd->origin = 0;				
  nbfd->opened_once = false;
  nbfd->output_has_begun = false;
  nbfd->section_count = 0;
  nbfd->usrdata = (PTR) NULL;
  nbfd->cacheable = false;
  nbfd->flags = BFD_NO_FLAGS;
  nbfd->mtime_set = false;

  return nbfd;
}

/* Allocate a new BFD as a member of archive OBFD.  */

bfd *
_bfd_new_bfd_contained_in (obfd)
     bfd *obfd;
{
  bfd *nbfd;

  nbfd = _bfd_new_bfd ();
  nbfd->xvec = obfd->xvec;
  nbfd->my_archive = obfd;
  nbfd->direction = read_direction;
  nbfd->target_defaulted = obfd->target_defaulted;
  return nbfd;
}

/*
SECTION
	Opening and closing BFDs

*/

/*
FUNCTION
	bfd_openr

SYNOPSIS
        bfd *bfd_openr(CONST char *filename, CONST char *target);

DESCRIPTION
	Open the file @var{filename} (using <<fopen>>) with the target
	@var{target}.  Return a pointer to the created BFD.

	Calls <<bfd_find_target>>, so @var{target} is interpreted as by
	that function.

	If <<NULL>> is returned then an error has occured.   Possible errors
	are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or <<system_call>> error.
*/

bfd *
bfd_openr (filename, target)
     CONST char *filename;
     CONST char *target;
{
  bfd *nbfd;
  const bfd_target *target_vec;

  nbfd = _bfd_new_bfd ();
  if (nbfd == NULL)
    return NULL;

  target_vec = bfd_find_target (target, nbfd);
  if (target_vec == NULL)
    {
      objalloc_free ((struct objalloc *) nbfd->memory);
      free (nbfd);
      bfd_set_error (bfd_error_invalid_target);
      return NULL;
    }

  nbfd->filename = filename;
  nbfd->direction = read_direction;

  if (bfd_open_file (nbfd) == NULL)
    {
      /* File didn't exist, or some such */
      bfd_set_error (bfd_error_system_call);
      objalloc_free ((struct objalloc *) nbfd->memory);
      free (nbfd);
      return NULL;
    }

  return nbfd;
}

/* Don't try to `optimize' this function:

   o - We lock using stack space so that interrupting the locking
       won't cause a storage leak.
   o - We open the file stream last, since we don't want to have to
       close it if anything goes wrong.  Closing the stream means closing
       the file descriptor too, even though we didn't open it.
 */
/*
FUNCTION
         bfd_fdopenr

SYNOPSIS
         bfd *bfd_fdopenr(CONST char *filename, CONST char *target, int fd);

DESCRIPTION
         <<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to <<fopen>>.
	 It opens a BFD on a file already described by the @var{fd}
	 supplied.

	 When the file is later <<bfd_close>>d, the file descriptor will be closed.

	 If the caller desires that this file descriptor be cached by BFD
	 (opened as needed, closed as needed to free descriptors for
	 other opens), with the supplied @var{fd} used as an initial
	 file descriptor (but subject to closure at any time), call
	 bfd_set_cacheable(bfd, 1) on the returned BFD.  The default is to
	 assume no cacheing; the file descriptor will remain open until
	 <<bfd_close>>, and will not be affected by BFD operations on other
	 files.

         Possible errors are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
*/

bfd *
bfd_fdopenr (filename, target, fd)
     CONST char *filename;
     CONST char *target;
     int fd;
{
  bfd *nbfd;
  const bfd_target *target_vec;
  int fdflags;

  bfd_set_error (bfd_error_system_call);
#if ! defined(HAVE_FCNTL) || ! defined(F_GETFL)
  fdflags = O_RDWR;			/* Assume full access */
#else
  fdflags = fcntl (fd, F_GETFL, NULL);
#endif
  if (fdflags == -1) return NULL;

  nbfd = _bfd_new_bfd ();
  if (nbfd == NULL)
    return NULL;

  target_vec = bfd_find_target (target, nbfd);
  if (target_vec == NULL)
    {
      bfd_set_error (bfd_error_invalid_target);
      objalloc_free ((struct objalloc *) nbfd->memory);
      free (nbfd);
      return NULL;
    }

#ifndef HAVE_FDOPEN
  nbfd->iostream = (PTR) fopen (filename, FOPEN_RB);
#else
  /* (O_ACCMODE) parens are to avoid Ultrix header file bug */
  switch (fdflags & (O_ACCMODE))
    {
    case O_RDONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RB);   break;
    case O_WRONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB);  break;
    case O_RDWR:   nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB);  break;
    default: abort ();
    }
#endif

  if (nbfd->iostream == NULL)
    {
      objalloc_free ((struct objalloc *) nbfd->memory);
      free (nbfd);
      return NULL;
    }

  /* OK, put everything where it belongs */

  nbfd->filename = filename;

  /* As a special case we allow a FD open for read/write to
     be written through, although doing so requires that we end
     the previous clause with a preposition.  */
  /* (O_ACCMODE) parens are to avoid Ultrix header file bug */
  switch (fdflags & (O_ACCMODE))
    {
    case O_RDONLY: nbfd->direction = read_direction; break;
    case O_WRONLY: nbfd->direction = write_direction; break;
    case O_RDWR: nbfd->direction = both_direction; break;
    default: abort ();
    }

  if (! bfd_cache_init (nbfd))
    {
      objalloc_free ((struct objalloc *) nbfd->memory);
      free (nbfd);
      return NULL;
    }
  nbfd->opened_once = true;

  return nbfd;
}

/*
FUNCTION
	bfd_openstreamr

SYNOPSIS
	bfd *bfd_openstreamr(const char *, const char *, PTR);

DESCRIPTION

	Open a BFD for read access on an existing stdio stream.  When
	the BFD is passed to <<bfd_close>>, the stream will be closed.
*/

bfd *
bfd_openstreamr (filename, target, streamarg)
     const char *filename;
     const char *target;
     PTR streamarg;
{
  FILE *stream = (FILE *) streamarg;
  bfd *nbfd;
  const bfd_target *target_vec;

  nbfd = _bfd_new_bfd ();
  if (nbfd == NULL)
    return NULL;

  target_vec = bfd_find_target (target, nbfd);
  if (target_vec == NULL)
    {
      bfd_set_error (bfd_error_invalid_target);
      objalloc_free ((struct objalloc *) nbfd->memory);
      free (nbfd);
      return NULL;
    }

  nbfd->iostream = (PTR) stream;
  nbfd->filename = filename;
  nbfd->direction = read_direction;
				
  if (! bfd_cache_init (nbfd))
    {
      objalloc_free ((struct objalloc *) nbfd->memory);
      free (nbfd);
      return NULL;
    }

  return nbfd;
}

/** bfd_openw -- open for writing.
  Returns a pointer to a freshly-allocated BFD on success, or NULL.

  See comment by bfd_fdopenr before you try to modify this function. */

/*
FUNCTION
	bfd_openw

SYNOPSIS
	bfd *bfd_openw(CONST char *filename, CONST char *target);

DESCRIPTION
	Create a BFD, associated with file @var{filename}, using the
	file format @var{target}, and return a pointer to it.

	Possible errors are <<bfd_error_system_call>>, <<bfd_error_no_memory>>,
	<<bfd_error_invalid_target>>.
*/

bfd *
bfd_openw (filename, target)
     CONST char *filename;