1 |
205 |
julius |
/* BFD library -- caching of file descriptors.
|
2 |
|
|
|
3 |
|
|
Copyright 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002,
|
4 |
|
|
2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
|
5 |
|
|
|
6 |
|
|
Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
|
7 |
|
|
|
8 |
|
|
This file is part of BFD, the Binary File Descriptor library.
|
9 |
|
|
|
10 |
|
|
This program is free software; you can redistribute it and/or modify
|
11 |
|
|
it under the terms of the GNU General Public License as published by
|
12 |
|
|
the Free Software Foundation; either version 3 of the License, or
|
13 |
|
|
(at your option) any later version.
|
14 |
|
|
|
15 |
|
|
This program is distributed in the hope that it will be useful,
|
16 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
17 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
18 |
|
|
GNU General Public License for more details.
|
19 |
|
|
|
20 |
|
|
You should have received a copy of the GNU General Public License
|
21 |
|
|
along with this program; if not, write to the Free Software
|
22 |
|
|
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
23 |
|
|
MA 02110-1301, USA. */
|
24 |
|
|
|
25 |
|
|
/*
|
26 |
|
|
SECTION
|
27 |
|
|
File caching
|
28 |
|
|
|
29 |
|
|
The file caching mechanism is embedded within BFD and allows
|
30 |
|
|
the application to open as many BFDs as it wants without
|
31 |
|
|
regard to the underlying operating system's file descriptor
|
32 |
|
|
limit (often as low as 20 open files). The module in
|
33 |
|
|
<<cache.c>> maintains a least recently used list of
|
34 |
|
|
<<BFD_CACHE_MAX_OPEN>> files, and exports the name
|
35 |
|
|
<<bfd_cache_lookup>>, which runs around and makes sure that
|
36 |
|
|
the required BFD is open. If not, then it chooses a file to
|
37 |
|
|
close, closes it and opens the one wanted, returning its file
|
38 |
|
|
handle.
|
39 |
|
|
|
40 |
|
|
SUBSECTION
|
41 |
|
|
Caching functions
|
42 |
|
|
*/
|
43 |
|
|
|
44 |
|
|
#include "sysdep.h"
|
45 |
|
|
#include "bfd.h"
|
46 |
|
|
#include "libbfd.h"
|
47 |
|
|
#include "libiberty.h"
|
48 |
|
|
|
49 |
|
|
#ifdef HAVE_MMAP
|
50 |
|
|
#include <sys/mman.h>
|
51 |
|
|
#endif
|
52 |
|
|
|
53 |
|
|
/* In some cases we can optimize cache operation when reopening files.
|
54 |
|
|
For instance, a flush is entirely unnecessary if the file is already
|
55 |
|
|
closed, so a flush would use CACHE_NO_OPEN. Similarly, a seek using
|
56 |
|
|
SEEK_SET or SEEK_END need not first seek to the current position.
|
57 |
|
|
For stat we ignore seek errors, just in case the file has changed
|
58 |
|
|
while we weren't looking. If it has, then it's possible that the
|
59 |
|
|
file is shorter and we don't want a seek error to prevent us doing
|
60 |
|
|
the stat. */
|
61 |
|
|
enum cache_flag {
|
62 |
|
|
CACHE_NORMAL = 0,
|
63 |
|
|
CACHE_NO_OPEN = 1,
|
64 |
|
|
CACHE_NO_SEEK = 2,
|
65 |
|
|
CACHE_NO_SEEK_ERROR = 4
|
66 |
|
|
};
|
67 |
|
|
|
68 |
|
|
/* The maximum number of files which the cache will keep open at
|
69 |
|
|
one time. */
|
70 |
|
|
|
71 |
|
|
#define BFD_CACHE_MAX_OPEN 10
|
72 |
|
|
|
73 |
|
|
/* The number of BFD files we have open. */
|
74 |
|
|
|
75 |
|
|
static int open_files;
|
76 |
|
|
|
77 |
|
|
/* Zero, or a pointer to the topmost BFD on the chain. This is
|
78 |
|
|
used by the <<bfd_cache_lookup>> macro in @file{libbfd.h} to
|
79 |
|
|
determine when it can avoid a function call. */
|
80 |
|
|
|
81 |
|
|
static bfd *bfd_last_cache = NULL;
|
82 |
|
|
|
83 |
|
|
/* Insert a BFD into the cache. */
|
84 |
|
|
|
85 |
|
|
static void
|
86 |
|
|
insert (bfd *abfd)
|
87 |
|
|
{
|
88 |
|
|
if (bfd_last_cache == NULL)
|
89 |
|
|
{
|
90 |
|
|
abfd->lru_next = abfd;
|
91 |
|
|
abfd->lru_prev = abfd;
|
92 |
|
|
}
|
93 |
|
|
else
|
94 |
|
|
{
|
95 |
|
|
abfd->lru_next = bfd_last_cache;
|
96 |
|
|
abfd->lru_prev = bfd_last_cache->lru_prev;
|
97 |
|
|
abfd->lru_prev->lru_next = abfd;
|
98 |
|
|
abfd->lru_next->lru_prev = abfd;
|
99 |
|
|
}
|
100 |
|
|
bfd_last_cache = abfd;
|
101 |
|
|
}
|
102 |
|
|
|
103 |
|
|
/* Remove a BFD from the cache. */
|
104 |
|
|
|
105 |
|
|
static void
|
106 |
|
|
snip (bfd *abfd)
|
107 |
|
|
{
|
108 |
|
|
abfd->lru_prev->lru_next = abfd->lru_next;
|
109 |
|
|
abfd->lru_next->lru_prev = abfd->lru_prev;
|
110 |
|
|
if (abfd == bfd_last_cache)
|
111 |
|
|
{
|
112 |
|
|
bfd_last_cache = abfd->lru_next;
|
113 |
|
|
if (abfd == bfd_last_cache)
|
114 |
|
|
bfd_last_cache = NULL;
|
115 |
|
|
}
|
116 |
|
|
}
|
117 |
|
|
|
118 |
|
|
/* Close a BFD and remove it from the cache. */
|
119 |
|
|
|
120 |
|
|
static bfd_boolean
|
121 |
|
|
bfd_cache_delete (bfd *abfd)
|
122 |
|
|
{
|
123 |
|
|
bfd_boolean ret;
|
124 |
|
|
|
125 |
|
|
if (fclose ((FILE *) abfd->iostream) == 0)
|
126 |
|
|
ret = TRUE;
|
127 |
|
|
else
|
128 |
|
|
{
|
129 |
|
|
ret = FALSE;
|
130 |
|
|
bfd_set_error (bfd_error_system_call);
|
131 |
|
|
}
|
132 |
|
|
|
133 |
|
|
snip (abfd);
|
134 |
|
|
|
135 |
|
|
abfd->iostream = NULL;
|
136 |
|
|
--open_files;
|
137 |
|
|
|
138 |
|
|
return ret;
|
139 |
|
|
}
|
140 |
|
|
|
141 |
|
|
/* We need to open a new file, and the cache is full. Find the least
|
142 |
|
|
recently used cacheable BFD and close it. */
|
143 |
|
|
|
144 |
|
|
static bfd_boolean
|
145 |
|
|
close_one (void)
|
146 |
|
|
{
|
147 |
|
|
register bfd *kill;
|
148 |
|
|
|
149 |
|
|
if (bfd_last_cache == NULL)
|
150 |
|
|
kill = NULL;
|
151 |
|
|
else
|
152 |
|
|
{
|
153 |
|
|
for (kill = bfd_last_cache->lru_prev;
|
154 |
|
|
! kill->cacheable;
|
155 |
|
|
kill = kill->lru_prev)
|
156 |
|
|
{
|
157 |
|
|
if (kill == bfd_last_cache)
|
158 |
|
|
{
|
159 |
|
|
kill = NULL;
|
160 |
|
|
break;
|
161 |
|
|
}
|
162 |
|
|
}
|
163 |
|
|
}
|
164 |
|
|
|
165 |
|
|
if (kill == NULL)
|
166 |
|
|
{
|
167 |
|
|
/* There are no open cacheable BFD's. */
|
168 |
|
|
return TRUE;
|
169 |
|
|
}
|
170 |
|
|
|
171 |
|
|
kill->where = real_ftell ((FILE *) kill->iostream);
|
172 |
|
|
|
173 |
|
|
return bfd_cache_delete (kill);
|
174 |
|
|
}
|
175 |
|
|
|
176 |
|
|
/* Check to see if the required BFD is the same as the last one
|
177 |
|
|
looked up. If so, then it can use the stream in the BFD with
|
178 |
|
|
impunity, since it can't have changed since the last lookup;
|
179 |
|
|
otherwise, it has to perform the complicated lookup function. */
|
180 |
|
|
|
181 |
|
|
#define bfd_cache_lookup(x, flag) \
|
182 |
|
|
((x) == bfd_last_cache \
|
183 |
|
|
? (FILE *) (bfd_last_cache->iostream) \
|
184 |
|
|
: bfd_cache_lookup_worker (x, flag))
|
185 |
|
|
|
186 |
|
|
/* Called when the macro <<bfd_cache_lookup>> fails to find a
|
187 |
|
|
quick answer. Find a file descriptor for @var{abfd}. If
|
188 |
|
|
necessary, it open it. If there are already more than
|
189 |
|
|
<<BFD_CACHE_MAX_OPEN>> files open, it tries to close one first, to
|
190 |
|
|
avoid running out of file descriptors. It will return NULL
|
191 |
|
|
if it is unable to (re)open the @var{abfd}. */
|
192 |
|
|
|
193 |
|
|
static FILE *
|
194 |
|
|
bfd_cache_lookup_worker (bfd *abfd, enum cache_flag flag)
|
195 |
|
|
{
|
196 |
|
|
bfd *orig_bfd = abfd;
|
197 |
|
|
if ((abfd->flags & BFD_IN_MEMORY) != 0)
|
198 |
|
|
abort ();
|
199 |
|
|
|
200 |
|
|
if (abfd->my_archive)
|
201 |
|
|
abfd = abfd->my_archive;
|
202 |
|
|
|
203 |
|
|
if (abfd->iostream != NULL)
|
204 |
|
|
{
|
205 |
|
|
/* Move the file to the start of the cache. */
|
206 |
|
|
if (abfd != bfd_last_cache)
|
207 |
|
|
{
|
208 |
|
|
snip (abfd);
|
209 |
|
|
insert (abfd);
|
210 |
|
|
}
|
211 |
|
|
return (FILE *) abfd->iostream;
|
212 |
|
|
}
|
213 |
|
|
|
214 |
|
|
if (flag & CACHE_NO_OPEN)
|
215 |
|
|
return NULL;
|
216 |
|
|
|
217 |
|
|
if (bfd_open_file (abfd) == NULL)
|
218 |
|
|
;
|
219 |
|
|
else if (!(flag & CACHE_NO_SEEK)
|
220 |
|
|
&& real_fseek ((FILE *) abfd->iostream, abfd->where, SEEK_SET) != 0
|
221 |
|
|
&& !(flag & CACHE_NO_SEEK_ERROR))
|
222 |
|
|
bfd_set_error (bfd_error_system_call);
|
223 |
|
|
else
|
224 |
|
|
return (FILE *) abfd->iostream;
|
225 |
|
|
|
226 |
|
|
(*_bfd_error_handler) (_("reopening %B: %s\n"),
|
227 |
|
|
orig_bfd, bfd_errmsg (bfd_get_error ()));
|
228 |
|
|
return NULL;
|
229 |
|
|
}
|
230 |
|
|
|
231 |
|
|
static file_ptr
|
232 |
|
|
cache_btell (struct bfd *abfd)
|
233 |
|
|
{
|
234 |
|
|
FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN);
|
235 |
|
|
if (f == NULL)
|
236 |
|
|
return abfd->where;
|
237 |
|
|
return real_ftell (f);
|
238 |
|
|
}
|
239 |
|
|
|
240 |
|
|
static int
|
241 |
|
|
cache_bseek (struct bfd *abfd, file_ptr offset, int whence)
|
242 |
|
|
{
|
243 |
|
|
FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : CACHE_NORMAL);
|
244 |
|
|
if (f == NULL)
|
245 |
|
|
return -1;
|
246 |
|
|
return real_fseek (f, offset, whence);
|
247 |
|
|
}
|
248 |
|
|
|
249 |
|
|
/* Note that archive entries don't have streams; they share their parent's.
|
250 |
|
|
This allows someone to play with the iostream behind BFD's back.
|
251 |
|
|
|
252 |
|
|
Also, note that the origin pointer points to the beginning of a file's
|
253 |
|
|
contents (0 for non-archive elements). For archive entries this is the
|
254 |
|
|
first octet in the file, NOT the beginning of the archive header. */
|
255 |
|
|
|
256 |
|
|
static file_ptr
|
257 |
|
|
cache_bread_1 (struct bfd *abfd, void *buf, file_ptr nbytes)
|
258 |
|
|
{
|
259 |
|
|
FILE *f;
|
260 |
|
|
file_ptr nread;
|
261 |
|
|
/* FIXME - this looks like an optimization, but it's really to cover
|
262 |
|
|
up for a feature of some OSs (not solaris - sigh) that
|
263 |
|
|
ld/pe-dll.c takes advantage of (apparently) when it creates BFDs
|
264 |
|
|
internally and tries to link against them. BFD seems to be smart
|
265 |
|
|
enough to realize there are no symbol records in the "file" that
|
266 |
|
|
doesn't exist but attempts to read them anyway. On Solaris,
|
267 |
|
|
attempting to read zero bytes from a NULL file results in a core
|
268 |
|
|
dump, but on other platforms it just returns zero bytes read.
|
269 |
|
|
This makes it to something reasonable. - DJ */
|
270 |
|
|
if (nbytes == 0)
|
271 |
|
|
return 0;
|
272 |
|
|
|
273 |
|
|
f = bfd_cache_lookup (abfd, CACHE_NORMAL);
|
274 |
|
|
if (f == NULL)
|
275 |
|
|
return 0;
|
276 |
|
|
|
277 |
|
|
#if defined (__VAX) && defined (VMS)
|
278 |
|
|
/* Apparently fread on Vax VMS does not keep the record length
|
279 |
|
|
information. */
|
280 |
|
|
nread = read (fileno (f), buf, nbytes);
|
281 |
|
|
/* Set bfd_error if we did not read as much data as we expected. If
|
282 |
|
|
the read failed due to an error set the bfd_error_system_call,
|
283 |
|
|
else set bfd_error_file_truncated. */
|
284 |
|
|
if (nread == (file_ptr)-1)
|
285 |
|
|
{
|
286 |
|
|
bfd_set_error (bfd_error_system_call);
|
287 |
|
|
return -1;
|
288 |
|
|
}
|
289 |
|
|
#else
|
290 |
|
|
nread = fread (buf, 1, nbytes, f);
|
291 |
|
|
/* Set bfd_error if we did not read as much data as we expected. If
|
292 |
|
|
the read failed due to an error set the bfd_error_system_call,
|
293 |
|
|
else set bfd_error_file_truncated. */
|
294 |
|
|
if (nread < nbytes && ferror (f))
|
295 |
|
|
{
|
296 |
|
|
bfd_set_error (bfd_error_system_call);
|
297 |
|
|
return -1;
|
298 |
|
|
}
|
299 |
|
|
#endif
|
300 |
|
|
if (nread < nbytes)
|
301 |
|
|
/* This may or may not be an error, but in case the calling code
|
302 |
|
|
bails out because of it, set the right error code. */
|
303 |
|
|
bfd_set_error (bfd_error_file_truncated);
|
304 |
|
|
return nread;
|
305 |
|
|
}
|
306 |
|
|
|
307 |
|
|
static file_ptr
|
308 |
|
|
cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
|
309 |
|
|
{
|
310 |
|
|
file_ptr nread = 0;
|
311 |
|
|
|
312 |
|
|
/* Some filesystems are unable to handle reads that are too large
|
313 |
|
|
(for instance, NetApp shares with oplocks turned off). To avoid
|
314 |
|
|
hitting this limitation, we read the buffer in chunks of 8MB max. */
|
315 |
|
|
while (nread < nbytes)
|
316 |
|
|
{
|
317 |
|
|
const file_ptr max_chunk_size = 0x800000;
|
318 |
|
|
file_ptr chunk_size = nbytes - nread;
|
319 |
|
|
file_ptr chunk_nread;
|
320 |
|
|
|
321 |
|
|
if (chunk_size > max_chunk_size)
|
322 |
|
|
chunk_size = max_chunk_size;
|
323 |
|
|
|
324 |
|
|
chunk_nread = cache_bread_1 (abfd, (char *) buf + nread, chunk_size);
|
325 |
|
|
|
326 |
|
|
/* Update the nread count.
|
327 |
|
|
|
328 |
|
|
We just have to be careful of the case when cache_bread_1 returns
|
329 |
|
|
a negative count: If this is our first read, then set nread to
|
330 |
|
|
that negative count in order to return that negative value to the
|
331 |
|
|
caller. Otherwise, don't add it to our total count, or we would
|
332 |
|
|
end up returning a smaller number of bytes read than we actually
|
333 |
|
|
did. */
|
334 |
|
|
if (nread == 0 || chunk_nread > 0)
|
335 |
|
|
nread += chunk_nread;
|
336 |
|
|
|
337 |
|
|
if (chunk_nread < chunk_size)
|
338 |
|
|
break;
|
339 |
|
|
}
|
340 |
|
|
|
341 |
|
|
return nread;
|
342 |
|
|
}
|
343 |
|
|
|
344 |
|
|
static file_ptr
|
345 |
|
|
cache_bwrite (struct bfd *abfd, const void *where, file_ptr nbytes)
|
346 |
|
|
{
|
347 |
|
|
file_ptr nwrite;
|
348 |
|
|
FILE *f = bfd_cache_lookup (abfd, CACHE_NORMAL);
|
349 |
|
|
|
350 |
|
|
if (f == NULL)
|
351 |
|
|
return 0;
|
352 |
|
|
nwrite = fwrite (where, 1, nbytes, f);
|
353 |
|
|
if (nwrite < nbytes && ferror (f))
|
354 |
|
|
{
|
355 |
|
|
bfd_set_error (bfd_error_system_call);
|
356 |
|
|
return -1;
|
357 |
|
|
}
|
358 |
|
|
return nwrite;
|
359 |
|
|
}
|
360 |
|
|
|
361 |
|
|
static int
|
362 |
|
|
cache_bclose (struct bfd *abfd)
|
363 |
|
|
{
|
364 |
|
|
return bfd_cache_close (abfd);
|
365 |
|
|
}
|
366 |
|
|
|
367 |
|
|
static int
|
368 |
|
|
cache_bflush (struct bfd *abfd)
|
369 |
|
|
{
|
370 |
|
|
int sts;
|
371 |
|
|
FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN);
|
372 |
|
|
|
373 |
|
|
if (f == NULL)
|
374 |
|
|
return 0;
|
375 |
|
|
sts = fflush (f);
|
376 |
|
|
if (sts < 0)
|
377 |
|
|
bfd_set_error (bfd_error_system_call);
|
378 |
|
|
return sts;
|
379 |
|
|
}
|
380 |
|
|
|
381 |
|
|
static int
|
382 |
|
|
cache_bstat (struct bfd *abfd, struct stat *sb)
|
383 |
|
|
{
|
384 |
|
|
int sts;
|
385 |
|
|
FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
|
386 |
|
|
|
387 |
|
|
if (f == NULL)
|
388 |
|
|
return -1;
|
389 |
|
|
sts = fstat (fileno (f), sb);
|
390 |
|
|
if (sts < 0)
|
391 |
|
|
bfd_set_error (bfd_error_system_call);
|
392 |
|
|
return sts;
|
393 |
|
|
}
|
394 |
|
|
|
395 |
|
|
static void *
|
396 |
|
|
cache_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED,
|
397 |
|
|
void *addr ATTRIBUTE_UNUSED,
|
398 |
|
|
bfd_size_type len ATTRIBUTE_UNUSED,
|
399 |
|
|
int prot ATTRIBUTE_UNUSED,
|
400 |
|
|
int flags ATTRIBUTE_UNUSED,
|
401 |
|
|
file_ptr offset ATTRIBUTE_UNUSED)
|
402 |
|
|
{
|
403 |
|
|
void *ret = (void *) -1;
|
404 |
|
|
|
405 |
|
|
if ((abfd->flags & BFD_IN_MEMORY) != 0)
|
406 |
|
|
abort ();
|
407 |
|
|
#ifdef HAVE_MMAP
|
408 |
|
|
else
|
409 |
|
|
{
|
410 |
|
|
FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
|
411 |
|
|
if (f == NULL)
|
412 |
|
|
return ret;
|
413 |
|
|
|
414 |
|
|
ret = mmap (addr, len, prot, flags, fileno (f), offset);
|
415 |
|
|
if (ret == (void *) -1)
|
416 |
|
|
bfd_set_error (bfd_error_system_call);
|
417 |
|
|
}
|
418 |
|
|
#endif
|
419 |
|
|
|
420 |
|
|
return ret;
|
421 |
|
|
}
|
422 |
|
|
|
423 |
|
|
static const struct bfd_iovec cache_iovec =
|
424 |
|
|
{
|
425 |
|
|
&cache_bread, &cache_bwrite, &cache_btell, &cache_bseek,
|
426 |
|
|
&cache_bclose, &cache_bflush, &cache_bstat, &cache_bmmap
|
427 |
|
|
};
|
428 |
|
|
|
429 |
|
|
/*
|
430 |
|
|
INTERNAL_FUNCTION
|
431 |
|
|
bfd_cache_init
|
432 |
|
|
|
433 |
|
|
SYNOPSIS
|
434 |
|
|
bfd_boolean bfd_cache_init (bfd *abfd);
|
435 |
|
|
|
436 |
|
|
DESCRIPTION
|
437 |
|
|
Add a newly opened BFD to the cache.
|
438 |
|
|
*/
|
439 |
|
|
|
440 |
|
|
bfd_boolean
|
441 |
|
|
bfd_cache_init (bfd *abfd)
|
442 |
|
|
{
|
443 |
|
|
BFD_ASSERT (abfd->iostream != NULL);
|
444 |
|
|
if (open_files >= BFD_CACHE_MAX_OPEN)
|
445 |
|
|
{
|
446 |
|
|
if (! close_one ())
|
447 |
|
|
return FALSE;
|
448 |
|
|
}
|
449 |
|
|
abfd->iovec = &cache_iovec;
|
450 |
|
|
insert (abfd);
|
451 |
|
|
++open_files;
|
452 |
|
|
return TRUE;
|
453 |
|
|
}
|
454 |
|
|
|
455 |
|
|
/*
|
456 |
|
|
INTERNAL_FUNCTION
|
457 |
|
|
bfd_cache_close
|
458 |
|
|
|
459 |
|
|
SYNOPSIS
|
460 |
|
|
bfd_boolean bfd_cache_close (bfd *abfd);
|
461 |
|
|
|
462 |
|
|
DESCRIPTION
|
463 |
|
|
Remove the BFD @var{abfd} from the cache. If the attached file is open,
|
464 |
|
|
then close it too.
|
465 |
|
|
|
466 |
|
|
RETURNS
|
467 |
|
|
<<FALSE>> is returned if closing the file fails, <<TRUE>> is
|
468 |
|
|
returned if all is well.
|
469 |
|
|
*/
|
470 |
|
|
|
471 |
|
|
bfd_boolean
|
472 |
|
|
bfd_cache_close (bfd *abfd)
|
473 |
|
|
{
|
474 |
|
|
if (abfd->iovec != &cache_iovec)
|
475 |
|
|
return TRUE;
|
476 |
|
|
|
477 |
|
|
if (abfd->iostream == NULL)
|
478 |
|
|
/* Previously closed. */
|
479 |
|
|
return TRUE;
|
480 |
|
|
|
481 |
|
|
return bfd_cache_delete (abfd);
|
482 |
|
|
}
|
483 |
|
|
|
484 |
|
|
/*
|
485 |
|
|
FUNCTION
|
486 |
|
|
bfd_cache_close_all
|
487 |
|
|
|
488 |
|
|
SYNOPSIS
|
489 |
|
|
bfd_boolean bfd_cache_close_all (void);
|
490 |
|
|
|
491 |
|
|
DESCRIPTION
|
492 |
|
|
Remove all BFDs from the cache. If the attached file is open,
|
493 |
|
|
then close it too.
|
494 |
|
|
|
495 |
|
|
RETURNS
|
496 |
|
|
<<FALSE>> is returned if closing one of the file fails, <<TRUE>> is
|
497 |
|
|
returned if all is well.
|
498 |
|
|
*/
|
499 |
|
|
|
500 |
|
|
bfd_boolean
|
501 |
|
|
bfd_cache_close_all ()
|
502 |
|
|
{
|
503 |
|
|
bfd_boolean ret = TRUE;
|
504 |
|
|
|
505 |
|
|
while (bfd_last_cache != NULL)
|
506 |
|
|
ret &= bfd_cache_close (bfd_last_cache);
|
507 |
|
|
|
508 |
|
|
return ret;
|
509 |
|
|
}
|
510 |
|
|
|
511 |
|
|
/*
|
512 |
|
|
INTERNAL_FUNCTION
|
513 |
|
|
bfd_open_file
|
514 |
|
|
|
515 |
|
|
SYNOPSIS
|
516 |
|
|
FILE* bfd_open_file (bfd *abfd);
|
517 |
|
|
|
518 |
|
|
DESCRIPTION
|
519 |
|
|
Call the OS to open a file for @var{abfd}. Return the <<FILE *>>
|
520 |
|
|
(possibly <<NULL>>) that results from this operation. Set up the
|
521 |
|
|
BFD so that future accesses know the file is open. If the <<FILE *>>
|
522 |
|
|
returned is <<NULL>>, then it won't have been put in the
|
523 |
|
|
cache, so it won't have to be removed from it.
|
524 |
|
|
*/
|
525 |
|
|
|
526 |
|
|
FILE *
|
527 |
|
|
bfd_open_file (bfd *abfd)
|
528 |
|
|
{
|
529 |
|
|
abfd->cacheable = TRUE; /* Allow it to be closed later. */
|
530 |
|
|
|
531 |
|
|
if (open_files >= BFD_CACHE_MAX_OPEN)
|
532 |
|
|
{
|
533 |
|
|
if (! close_one ())
|
534 |
|
|
return NULL;
|
535 |
|
|
}
|
536 |
|
|
|
537 |
|
|
switch (abfd->direction)
|
538 |
|
|
{
|
539 |
|
|
case read_direction:
|
540 |
|
|
case no_direction:
|
541 |
|
|
abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_RB);
|
542 |
|
|
break;
|
543 |
|
|
case both_direction:
|
544 |
|
|
case write_direction:
|
545 |
|
|
if (abfd->opened_once)
|
546 |
|
|
{
|
547 |
|
|
abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_RUB);
|
548 |
|
|
if (abfd->iostream == NULL)
|
549 |
|
|
abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_WUB);
|
550 |
|
|
}
|
551 |
|
|
else
|
552 |
|
|
{
|
553 |
|
|
/* Create the file.
|
554 |
|
|
|
555 |
|
|
Some operating systems won't let us overwrite a running
|
556 |
|
|
binary. For them, we want to unlink the file first.
|
557 |
|
|
|
558 |
|
|
However, gcc 2.95 will create temporary files using
|
559 |
|
|
O_EXCL and tight permissions to prevent other users from
|
560 |
|
|
substituting other .o files during the compilation. gcc
|
561 |
|
|
will then tell the assembler to use the newly created
|
562 |
|
|
file as an output file. If we unlink the file here, we
|
563 |
|
|
open a brief window when another user could still
|
564 |
|
|
substitute a file.
|
565 |
|
|
|
566 |
|
|
So we unlink the output file if and only if it has
|
567 |
|
|
non-zero size. */
|
568 |
|
|
#ifndef __MSDOS__
|
569 |
|
|
/* Don't do this for MSDOS: it doesn't care about overwriting
|
570 |
|
|
a running binary, but if this file is already open by
|
571 |
|
|
another BFD, we will be in deep trouble if we delete an
|
572 |
|
|
open file. In fact, objdump does just that if invoked with
|
573 |
|
|
the --info option. */
|
574 |
|
|
struct stat s;
|
575 |
|
|
|
576 |
|
|
if (stat (abfd->filename, &s) == 0 && s.st_size != 0)
|
577 |
|
|
unlink_if_ordinary (abfd->filename);
|
578 |
|
|
#endif
|
579 |
|
|
abfd->iostream = (PTR) real_fopen (abfd->filename, FOPEN_WUB);
|
580 |
|
|
abfd->opened_once = TRUE;
|
581 |
|
|
}
|
582 |
|
|
break;
|
583 |
|
|
}
|
584 |
|
|
|
585 |
|
|
if (abfd->iostream == NULL)
|
586 |
|
|
bfd_set_error (bfd_error_system_call);
|
587 |
|
|
else
|
588 |
|
|
{
|
589 |
|
|
if (! bfd_cache_init (abfd))
|
590 |
|
|
return NULL;
|
591 |
|
|
}
|
592 |
|
|
|
593 |
|
|
return (FILE *) abfd->iostream;
|
594 |
|
|
}
|