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/* BFD library -- caching of file descriptors.
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/* BFD library -- caching of file descriptors.
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Copyright 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002,
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Copyright 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002,
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2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
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Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
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Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
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This file is part of BFD, the Binary File Descriptor library.
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This file is part of BFD, the Binary File Descriptor library.
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Line 44... |
#include "sysdep.h"
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "libbfd.h"
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#include "libiberty.h"
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#include "libiberty.h"
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#ifdef HAVE_MMAP
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#include <sys/mman.h>
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#endif
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/* In some cases we can optimize cache operation when reopening files.
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/* In some cases we can optimize cache operation when reopening files.
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For instance, a flush is entirely unnecessary if the file is already
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For instance, a flush is entirely unnecessary if the file is already
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closed, so a flush would use CACHE_NO_OPEN. Similarly, a seek using
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closed, so a flush would use CACHE_NO_OPEN. Similarly, a seek using
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SEEK_SET or SEEK_END need not first seek to the current position.
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SEEK_SET or SEEK_END need not first seek to the current position.
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For stat we ignore seek errors, just in case the file has changed
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For stat we ignore seek errors, just in case the file has changed
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return TRUE;
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return TRUE;
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}
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}
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kill->where = real_ftell ((FILE *) kill->iostream);
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kill->where = real_ftell ((FILE *) kill->iostream);
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/* Save the file st_mtime. This is a hack so that gdb can detect when
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an executable has been deleted and recreated. The only thing that
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makes this reasonable is that st_mtime doesn't change when a file
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is unlinked, so saving st_mtime makes BFD's file cache operation
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a little more transparent for this particular usage pattern. If we
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hadn't closed the file then we would not have lost the original
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contents, st_mtime etc. Of course, if something is writing to an
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existing file, then this is the wrong thing to do.
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FIXME: gdb should save these times itself on first opening a file,
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and this hack be removed. */
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if (kill->direction == no_direction || kill->direction == read_direction)
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{
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bfd_get_mtime (kill);
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kill->mtime_set = TRUE;
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}
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return bfd_cache_delete (kill);
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return bfd_cache_delete (kill);
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}
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}
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/* Check to see if the required BFD is the same as the last one
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/* Check to see if the required BFD is the same as the last one
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looked up. If so, then it can use the stream in the BFD with
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looked up. If so, then it can use the stream in the BFD with
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Line 238... |
}
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}
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static int
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static int
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cache_bseek (struct bfd *abfd, file_ptr offset, int whence)
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cache_bseek (struct bfd *abfd, file_ptr offset, int whence)
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{
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{
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FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : 0);
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FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : CACHE_NORMAL);
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if (f == NULL)
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if (f == NULL)
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return -1;
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return -1;
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return real_fseek (f, offset, whence);
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return real_fseek (f, offset, whence);
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}
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}
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Also, note that the origin pointer points to the beginning of a file's
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Also, note that the origin pointer points to the beginning of a file's
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contents (0 for non-archive elements). For archive entries this is the
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contents (0 for non-archive elements). For archive entries this is the
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first octet in the file, NOT the beginning of the archive header. */
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first octet in the file, NOT the beginning of the archive header. */
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static file_ptr
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static file_ptr
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cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
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cache_bread_1 (struct bfd *abfd, void *buf, file_ptr nbytes)
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{
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{
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FILE *f;
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FILE *f;
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file_ptr nread;
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file_ptr nread;
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/* FIXME - this looks like an optimization, but it's really to cover
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/* FIXME - this looks like an optimization, but it's really to cover
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up for a feature of some OSs (not solaris - sigh) that
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up for a feature of some OSs (not solaris - sigh) that
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dump, but on other platforms it just returns zero bytes read.
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dump, but on other platforms it just returns zero bytes read.
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This makes it to something reasonable. - DJ */
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This makes it to something reasonable. - DJ */
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if (nbytes == 0)
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if (nbytes == 0)
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return 0;
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return 0;
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f = bfd_cache_lookup (abfd, 0);
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f = bfd_cache_lookup (abfd, CACHE_NORMAL);
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if (f == NULL)
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if (f == NULL)
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return 0;
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return 0;
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#if defined (__VAX) && defined (VMS)
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#if defined (__VAX) && defined (VMS)
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/* Apparently fread on Vax VMS does not keep the record length
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/* Apparently fread on Vax VMS does not keep the record length
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bfd_set_error (bfd_error_file_truncated);
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bfd_set_error (bfd_error_file_truncated);
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return nread;
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return nread;
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}
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}
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static file_ptr
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static file_ptr
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cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
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{
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file_ptr nread = 0;
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/* Some filesystems are unable to handle reads that are too large
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(for instance, NetApp shares with oplocks turned off). To avoid
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hitting this limitation, we read the buffer in chunks of 8MB max. */
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while (nread < nbytes)
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{
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const file_ptr max_chunk_size = 0x800000;
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file_ptr chunk_size = nbytes - nread;
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file_ptr chunk_nread;
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if (chunk_size > max_chunk_size)
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chunk_size = max_chunk_size;
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chunk_nread = cache_bread_1 (abfd, (char *) buf + nread, chunk_size);
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/* Update the nread count.
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We just have to be careful of the case when cache_bread_1 returns
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a negative count: If this is our first read, then set nread to
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that negative count in order to return that negative value to the
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caller. Otherwise, don't add it to our total count, or we would
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end up returning a smaller number of bytes read than we actually
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did. */
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if (nread == 0 || chunk_nread > 0)
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nread += chunk_nread;
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if (chunk_nread < chunk_size)
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break;
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}
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return nread;
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}
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static file_ptr
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cache_bwrite (struct bfd *abfd, const void *where, file_ptr nbytes)
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cache_bwrite (struct bfd *abfd, const void *where, file_ptr nbytes)
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{
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{
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file_ptr nwrite;
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file_ptr nwrite;
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FILE *f = bfd_cache_lookup (abfd, 0);
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FILE *f = bfd_cache_lookup (abfd, CACHE_NORMAL);
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if (f == NULL)
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if (f == NULL)
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return 0;
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return 0;
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nwrite = fwrite (where, 1, nbytes, f);
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nwrite = fwrite (where, 1, nbytes, f);
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if (nwrite < nbytes && ferror (f))
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if (nwrite < nbytes && ferror (f))
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{
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{
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Line 367... |
static int
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static int
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cache_bflush (struct bfd *abfd)
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cache_bflush (struct bfd *abfd)
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{
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{
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int sts;
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int sts;
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FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN);
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FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN);
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if (f == NULL)
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if (f == NULL)
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return 0;
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return 0;
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sts = fflush (f);
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sts = fflush (f);
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if (sts < 0)
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if (sts < 0)
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bfd_set_error (bfd_error_system_call);
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bfd_set_error (bfd_error_system_call);
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Line 381... |
static int
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static int
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cache_bstat (struct bfd *abfd, struct stat *sb)
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cache_bstat (struct bfd *abfd, struct stat *sb)
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{
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{
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int sts;
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int sts;
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FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
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FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
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if (f == NULL)
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if (f == NULL)
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return -1;
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return -1;
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sts = fstat (fileno (f), sb);
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sts = fstat (fileno (f), sb);
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if (sts < 0)
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if (sts < 0)
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bfd_set_error (bfd_error_system_call);
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bfd_set_error (bfd_error_system_call);
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return sts;
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return sts;
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}
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}
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static const struct bfd_iovec cache_iovec = {
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static void *
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cache_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED,
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void *addr ATTRIBUTE_UNUSED,
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bfd_size_type len ATTRIBUTE_UNUSED,
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int prot ATTRIBUTE_UNUSED,
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int flags ATTRIBUTE_UNUSED,
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file_ptr offset ATTRIBUTE_UNUSED)
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{
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void *ret = (void *) -1;
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if ((abfd->flags & BFD_IN_MEMORY) != 0)
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abort ();
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#ifdef HAVE_MMAP
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else
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{
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FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
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if (f == NULL)
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return ret;
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ret = mmap (addr, len, prot, flags, fileno (f), offset);
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if (ret == (void *) -1)
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bfd_set_error (bfd_error_system_call);
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}
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#endif
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return ret;
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}
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static const struct bfd_iovec cache_iovec =
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{
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&cache_bread, &cache_bwrite, &cache_btell, &cache_bseek,
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&cache_bread, &cache_bwrite, &cache_btell, &cache_bseek,
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&cache_bclose, &cache_bflush, &cache_bstat
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&cache_bclose, &cache_bflush, &cache_bstat, &cache_bmmap
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};
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};
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/*
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/*
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INTERNAL_FUNCTION
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INTERNAL_FUNCTION
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bfd_cache_init
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bfd_cache_init
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