/* BFD library -- caching of file descriptors.
- Copyright 1990, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
+ Copyright 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002
+ 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.
<<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
- handle.
+ handle.
*/
static void insert PARAMS ((bfd *));
static void snip PARAMS ((bfd *));
-static boolean close_one PARAMS ((void));
-static boolean bfd_cache_delete PARAMS ((bfd *));
+static bfd_boolean close_one PARAMS ((void));
+static bfd_boolean bfd_cache_delete PARAMS ((bfd *));
/*
INTERNAL_FUNCTION
/*
INTERNAL_FUNCTION
bfd_cache_lookup
-
+
DESCRIPTION
Check to see if the required BFD is the same as the last one
looked up. If so, then it can use the stream in the BFD with
impunity, since it can't have changed since the last lookup;
otherwise, it has to perform the complicated lookup function.
-
+
.#define bfd_cache_lookup(x) \
. ((x)==bfd_last_cache? \
- . (FILE*)(bfd_last_cache->iostream): \
+ . (FILE*) (bfd_last_cache->iostream): \
. bfd_cache_lookup_worker(x))
-
-
+
*/
/* Insert a BFD into the cache. */
/* We need to open a new file, and the cache is full. Find the least
recently used cacheable BFD and close it. */
-static boolean
+static bfd_boolean
close_one ()
{
register bfd *kill;
if (kill == NULL)
{
/* There are no open cacheable BFD's. */
- return true;
+ return TRUE;
}
kill->where = ftell ((FILE *) kill->iostream);
/* Close a BFD and remove it from the cache. */
-static boolean
+static bfd_boolean
bfd_cache_delete (abfd)
bfd *abfd;
{
- boolean ret;
+ bfd_boolean ret;
if (fclose ((FILE *) abfd->iostream) == 0)
- ret = true;
+ ret = TRUE;
else
{
- ret = false;
+ ret = FALSE;
bfd_set_error (bfd_error_system_call);
}
bfd_cache_init
SYNOPSIS
- boolean bfd_cache_init (bfd *abfd);
+ bfd_boolean bfd_cache_init (bfd *abfd);
DESCRIPTION
Add a newly opened BFD to the cache.
*/
-boolean
+bfd_boolean
bfd_cache_init (abfd)
bfd *abfd;
{
if (open_files >= BFD_CACHE_MAX_OPEN)
{
if (! close_one ())
- return false;
+ return FALSE;
}
insert (abfd);
++open_files;
- return true;
+ return TRUE;
}
/*
bfd_cache_close
SYNOPSIS
- boolean bfd_cache_close (bfd *abfd);
+ bfd_boolean bfd_cache_close (bfd *abfd);
DESCRIPTION
Remove the BFD @var{abfd} from the cache. If the attached file is open,
then close it too.
RETURNS
- <<false>> is returned if closing the file fails, <<true>> is
+ <<FALSE>> is returned if closing the file fails, <<TRUE>> is
returned if all is well.
*/
-boolean
+bfd_boolean
bfd_cache_close (abfd)
bfd *abfd;
{
if (abfd->iostream == NULL
|| (abfd->flags & BFD_IN_MEMORY) != 0)
- return true;
+ return TRUE;
return bfd_cache_delete (abfd);
}
bfd_open_file (abfd)
bfd *abfd;
{
- abfd->cacheable = true; /* Allow it to be closed later. */
+ abfd->cacheable = TRUE; /* Allow it to be closed later. */
if (open_files >= BFD_CACHE_MAX_OPEN)
{
break;
case both_direction:
case write_direction:
- if (abfd->opened_once == true)
+ if (abfd->opened_once)
{
abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_RUB);
if (abfd->iostream == NULL)
}
else
{
- /* Create the file. Unlink it first, for the convenience of
- operating systems which worry about overwriting running
- binaries. */
- unlink (abfd->filename);
- abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WB);
- abfd->opened_once = true;
+ /* Create the file.
+
+ Some operating systems won't let us overwrite a running
+ binary. For them, we want to unlink the file first.
+
+ However, gcc 2.95 will create temporary files using
+ O_EXCL and tight permissions to prevent other users from
+ substituting other .o files during the compilation. gcc
+ will then tell the assembler to use the newly created
+ file as an output file. If we unlink the file here, we
+ open a brief window when another user could still
+ substitute a file.
+
+ So we unlink the output file if and only if it has
+ non-zero size. */
+#ifndef __MSDOS__
+ /* Don't do this for MSDOS: it doesn't care about overwriting
+ a running binary, but if this file is already open by
+ another BFD, we will be in deep trouble if we delete an
+ open file. In fact, objdump does just that if invoked with
+ the --info option. */
+ struct stat s;
+
+ if (stat (abfd->filename, &s) == 0 && s.st_size != 0)
+ unlink (abfd->filename);
+#endif
+ abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WUB);
+ abfd->opened_once = TRUE;
}
break;
}
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
- avoid running out of file descriptors.
+ avoid running out of file descriptors.
*/
FILE *
if ((abfd->flags & BFD_IN_MEMORY) != 0)
abort ();
- if (abfd->my_archive)
+ if (abfd->my_archive)
abfd = abfd->my_archive;
if (abfd->iostream != NULL)
{
if (bfd_open_file (abfd) == NULL)
return NULL;
- if (fseek ((FILE *) abfd->iostream, abfd->where, SEEK_SET) != 0)
+ if (abfd->where != (unsigned long) abfd->where)
+ return NULL;
+ if (fseek ((FILE *) abfd->iostream, (long) abfd->where, SEEK_SET) != 0)
return NULL;
}
projects / binutils-gdb.git / blobdiff