/* BFD library -- caching of file descriptors.
- Copyright 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002,
- 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
+ Copyright (C) 1990-2014 Free Software Foundation, Inc.
Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
regard to the underlying operating system's file descriptor
limit (often as low as 20 open files). The module in
<<cache.c>> maintains a least recently used list of
- <<BFD_CACHE_MAX_OPEN>> files, and exports the name
+ <<bfd_cache_max_open>> files, and exports the name
<<bfd_cache_lookup>>, which runs around and makes sure that
the required BFD is open. If not, then it chooses a file to
close, closes it and opens the one wanted, returning its file
#include "bfd.h"
#include "libbfd.h"
#include "libiberty.h"
+#include "bfd_stdint.h"
+
+#ifdef HAVE_MMAP
+#include <sys/mman.h>
+#endif
/* In some cases we can optimize cache operation when reopening files.
For instance, a flush is entirely unnecessary if the file is already
};
/* The maximum number of files which the cache will keep open at
- one time. */
+ one time. When needed call bfd_cache_max_open to initialize. */
-#define BFD_CACHE_MAX_OPEN 10
+static int max_open_files = 0;
+
+/* Set max_open_files, if not already set, to 12.5% of the allowed open
+ file descriptors, but at least 10, and return the value. */
+static int
+bfd_cache_max_open (void)
+{
+ if (max_open_files == 0)
+ {
+ int max;
+#ifdef HAVE_GETRLIMIT
+ struct rlimit rlim;
+ if (getrlimit (RLIMIT_NOFILE, &rlim) == 0
+ && rlim.rlim_cur != (rlim_t) RLIM_INFINITY)
+ max = rlim.rlim_cur / 8;
+ else
+#endif /* HAVE_GETRLIMIT */
+#ifdef _SC_OPEN_MAX
+ max = sysconf (_SC_OPEN_MAX) / 8;
+#else
+ max = 10;
+#endif /* _SC_OPEN_MAX */
+ max_open_files = max < 10 ? 10 : max;
+ }
+
+ return max_open_files;
+}
/* The number of BFD files we have open. */
static bfd_boolean
close_one (void)
{
- register bfd *kill;
+ register bfd *to_kill;
if (bfd_last_cache == NULL)
- kill = NULL;
+ to_kill = NULL;
else
{
- for (kill = bfd_last_cache->lru_prev;
- ! kill->cacheable;
- kill = kill->lru_prev)
+ for (to_kill = bfd_last_cache->lru_prev;
+ ! to_kill->cacheable;
+ to_kill = to_kill->lru_prev)
{
- if (kill == bfd_last_cache)
+ if (to_kill == bfd_last_cache)
{
- kill = NULL;
+ to_kill = NULL;
break;
}
}
}
- if (kill == NULL)
+ if (to_kill == NULL)
{
/* There are no open cacheable BFD's. */
return TRUE;
}
- 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;
- }
+ to_kill->where = real_ftell ((FILE *) to_kill->iostream);
- return bfd_cache_delete (kill);
+ return bfd_cache_delete (to_kill);
}
/* Check to see if the required BFD is the same as the last one
/* Called when the macro <<bfd_cache_lookup>> fails to find a
quick answer. Find a file descriptor for @var{abfd}. If
necessary, it open it. If there are already more than
- <<BFD_CACHE_MAX_OPEN>> files open, it tries to close one first, to
+ <<bfd_cache_max_open>> files open, it tries to close one first, to
avoid running out of file descriptors. It will return NULL
if it is unable to (re)open the @var{abfd}. */
if ((abfd->flags & BFD_IN_MEMORY) != 0)
abort ();
- if (abfd->my_archive)
+ while (abfd->my_archive)
abfd = abfd->my_archive;
if (abfd->iostream != NULL)
static int
cache_bseek (struct bfd *abfd, file_ptr offset, int whence)
{
- FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : 0);
+ FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : CACHE_NORMAL);
if (f == NULL)
return -1;
return real_fseek (f, offset, whence);
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;
if (nbytes == 0)
return 0;
- f = bfd_cache_lookup (abfd, 0);
+ f = bfd_cache_lookup (abfd, CACHE_NORMAL);
if (f == NULL)
return 0;
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, (char *) 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;
}
cache_bwrite (struct bfd *abfd, const void *where, file_ptr nbytes)
{
file_ptr nwrite;
- FILE *f = bfd_cache_lookup (abfd, 0);
+ FILE *f = bfd_cache_lookup (abfd, CACHE_NORMAL);
+
if (f == NULL)
return 0;
nwrite = fwrite (where, 1, nbytes, f);
static int
cache_bclose (struct bfd *abfd)
{
- return bfd_cache_close (abfd);
+ return bfd_cache_close (abfd) - 1;
}
static int
{
int sts;
FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN);
+
if (f == NULL)
return 0;
sts = fflush (f);
{
int sts;
FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
+
if (f == NULL)
return -1;
sts = fstat (fileno (f), sb);
return sts;
}
-static const struct bfd_iovec cache_iovec = {
+static void *
+cache_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED,
+ void *addr ATTRIBUTE_UNUSED,
+ bfd_size_type len ATTRIBUTE_UNUSED,
+ int prot ATTRIBUTE_UNUSED,
+ int flags ATTRIBUTE_UNUSED,
+ file_ptr offset ATTRIBUTE_UNUSED,
+ void **map_addr ATTRIBUTE_UNUSED,
+ bfd_size_type *map_len ATTRIBUTE_UNUSED)
+{
+ void *ret = (void *) -1;
+
+ if ((abfd->flags & BFD_IN_MEMORY) != 0)
+ abort ();
+#ifdef HAVE_MMAP
+ else
+ {
+ static uintptr_t pagesize_m1;
+ FILE *f;
+ file_ptr pg_offset;
+ bfd_size_type pg_len;
+
+ f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
+ if (f == NULL)
+ return ret;
+
+ if (pagesize_m1 == 0)
+ pagesize_m1 = getpagesize () - 1;
+
+ /* Handle archive members. */
+ if (abfd->my_archive != NULL)
+ offset += abfd->origin;
+
+ /* Align. */
+ pg_offset = offset & ~pagesize_m1;
+ pg_len = (len + (offset - pg_offset) + pagesize_m1) & ~pagesize_m1;
+
+ ret = mmap (addr, pg_len, prot, flags, fileno (f), pg_offset);
+ if (ret == (void *) -1)
+ bfd_set_error (bfd_error_system_call);
+ else
+ {
+ *map_addr = ret;
+ *map_len = pg_len;
+ ret = (char *) ret + (offset & pagesize_m1);
+ }
+ }
+#endif
+
+ return ret;
+}
+
+static const struct bfd_iovec cache_iovec =
+{
&cache_bread, &cache_bwrite, &cache_btell, &cache_bseek,
- &cache_bclose, &cache_bflush, &cache_bstat
+ &cache_bclose, &cache_bflush, &cache_bstat, &cache_bmmap
};
/*
bfd_cache_init (bfd *abfd)
{
BFD_ASSERT (abfd->iostream != NULL);
- if (open_files >= BFD_CACHE_MAX_OPEN)
+ if (open_files >= bfd_cache_max_open ())
{
if (! close_one ())
return FALSE;
{
abfd->cacheable = TRUE; /* Allow it to be closed later. */
- if (open_files >= BFD_CACHE_MAX_OPEN)
+ if (open_files >= bfd_cache_max_open ())
{
if (! close_one ())
return NULL;
{
case read_direction:
case no_direction:
- abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_RB);
+ abfd->iostream = real_fopen (abfd->filename, FOPEN_RB);
break;
case both_direction:
case write_direction:
if (abfd->opened_once)
{
- abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_RUB);
+ abfd->iostream = real_fopen (abfd->filename, FOPEN_RUB);
if (abfd->iostream == NULL)
- abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_WUB);
+ abfd->iostream = 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) real_fopen (abfd->filename, FOPEN_WUB);
+ abfd->iostream = real_fopen (abfd->filename, FOPEN_WUB);
abfd->opened_once = TRUE;
}
break;
projects / deliverable / binutils-gdb.git / blobdiff