/* BFD library -- caching of file descriptors.
Copyright 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002,
- 2003, 2004, 2005 Free Software Foundation, Inc.
+ 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
-This file is part of BFD, the Binary File Descriptor library.
+ 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 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 3 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.
+ 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
+ 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., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
/*
SECTION
Caching functions
*/
-#include "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
#include "libbfd.h"
#include "libiberty.h"
kill->where = real_ftell ((FILE *) kill->iostream);
- /* Save the file st_mtime. This is a hack so that gdb can detect when
- an executable has been deleted and recreated. The only thing that
- makes this reasonable is that st_mtime doesn't change when a file
- is unlinked, so saving st_mtime makes BFD's file cache operation
- a little more transparent for this particular usage pattern. If we
- hadn't closed the file then we would not have lost the original
- contents, st_mtime etc. Of course, if something is writing to an
- existing file, then this is the wrong thing to do.
- FIXME: gdb should save these times itself on first opening a file,
- and this hack be removed. */
- if (kill->direction == no_direction || kill->direction == read_direction)
- {
- bfd_get_mtime (kill);
- kill->mtime_set = TRUE;
- }
-
return bfd_cache_delete (kill);
}
first octet in the file, NOT the beginning of the archive header. */
static file_ptr
-cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
+cache_bread_1 (struct bfd *abfd, void *buf, file_ptr nbytes)
{
FILE *f;
file_ptr nread;
return -1;
}
#endif
+ if (nread < nbytes)
+ /* This may or may not be an error, but in case the calling code
+ bails out because of it, set the right error code. */
+ bfd_set_error (bfd_error_file_truncated);
+ return nread;
+}
+
+static file_ptr
+cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
+{
+ file_ptr nread = 0;
+
+ /* Some filesystems are unable to handle reads that are too large
+ (for instance, NetApp shares with oplocks turned off). To avoid
+ hitting this limitation, we read the buffer in chunks of 8MB max. */
+ while (nread < nbytes)
+ {
+ const file_ptr max_chunk_size = 0x800000;
+ file_ptr chunk_size = nbytes - nread;
+ file_ptr chunk_nread;
+
+ if (chunk_size > max_chunk_size)
+ chunk_size = max_chunk_size;
+
+ chunk_nread = cache_bread_1 (abfd, buf + nread, chunk_size);
+
+ /* Update the nread count.
+
+ We just have to be careful of the case when cache_bread_1 returns
+ a negative count: If this is our first read, then set nread to
+ that negative count in order to return that negative value to the
+ caller. Otherwise, don't add it to our total count, or we would
+ end up returning a smaller number of bytes read than we actually
+ did. */
+ if (nread == 0 || chunk_nread > 0)
+ nread += chunk_nread;
+
+ if (chunk_nread < chunk_size)
+ break;
+ }
+
return nread;
}
{
case read_direction:
case no_direction:
- abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_RB);
+ abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_RB);
break;
case both_direction:
case write_direction:
if (abfd->opened_once)
{
- abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_RUB);
+ abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_RUB);
if (abfd->iostream == NULL)
- abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WUB);
+ abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_WUB);
}
else
{
if (stat (abfd->filename, &s) == 0 && s.st_size != 0)
unlink_if_ordinary (abfd->filename);
#endif
- abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WUB);
+ abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_WUB);
abfd->opened_once = TRUE;
}
break;