Commit | Line | Data |
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252b5132 | 1 | /* BFD library -- caching of file descriptors. |
7c192733 | 2 | |
219d1afa | 3 | Copyright (C) 1990-2018 Free Software Foundation, Inc. |
7c192733 | 4 | |
252b5132 RH |
5 | Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com). |
6 | ||
cd123cb7 NC |
7 | This file is part of BFD, the Binary File Descriptor library. |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | MA 02110-1301, USA. */ | |
252b5132 RH |
23 | |
24 | /* | |
25 | SECTION | |
26 | File caching | |
27 | ||
28 | The file caching mechanism is embedded within BFD and allows | |
29 | the application to open as many BFDs as it wants without | |
30 | regard to the underlying operating system's file descriptor | |
31 | limit (often as low as 20 open files). The module in | |
32 | <<cache.c>> maintains a least recently used list of | |
9d782e8d | 33 | <<bfd_cache_max_open>> files, and exports the name |
252b5132 RH |
34 | <<bfd_cache_lookup>>, which runs around and makes sure that |
35 | the required BFD is open. If not, then it chooses a file to | |
36 | close, closes it and opens the one wanted, returning its file | |
e60b52c6 | 37 | handle. |
252b5132 | 38 | |
1b74d094 BW |
39 | SUBSECTION |
40 | Caching functions | |
252b5132 RH |
41 | */ |
42 | ||
252b5132 | 43 | #include "sysdep.h" |
3db64b00 | 44 | #include "bfd.h" |
252b5132 | 45 | #include "libbfd.h" |
bb14f524 | 46 | #include "libiberty.h" |
4c95ab76 | 47 | #include "bfd_stdint.h" |
252b5132 | 48 | |
25b88f33 PP |
49 | #ifdef HAVE_MMAP |
50 | #include <sys/mman.h> | |
51 | #endif | |
52 | ||
95560129 AM |
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 | ||
d00967c7 | 68 | /* The maximum number of files which the cache will keep open at |
9d782e8d | 69 | one time. When needed call bfd_cache_max_open to initialize. */ |
d0fdd288 | 70 | |
9d782e8d MW |
71 | static int max_open_files = 0; |
72 | ||
73 | /* Set max_open_files, if not already set, to 12.5% of the allowed open | |
74 | file descriptors, but at least 10, and return the value. */ | |
75 | static int | |
76 | bfd_cache_max_open (void) | |
77 | { | |
78 | if (max_open_files == 0) | |
79 | { | |
80 | int max; | |
0b1fa288 ST |
81 | #if defined(__sun) && !defined(__sparcv9) && !defined(__x86_64__) |
82 | /* PR ld/19260: 32-bit Solaris has very inelegant handling of the 255 | |
83 | file descriptor limit. The problem is that setrlimit(2) can raise | |
84 | RLIMIT_NOFILE to a value that is not supported by libc, resulting | |
07d6d2b8 | 85 | in "Too many open files" errors. This can happen here even though |
0b1fa288 ST |
86 | max_open_files is set to rlim.rlim_cur / 8. For example, if |
87 | a parent process has set rlim.rlim_cur to 65536, then max_open_files | |
88 | will be computed as 8192. | |
89 | ||
90 | This check essentially reverts to the behavior from binutils 2.23.1 | |
07d6d2b8 | 91 | for 32-bit Solaris only. (It is hoped that the 32-bit libc |
0b1fa288 ST |
92 | limitation will be removed soon). 64-bit Solaris libc does not have |
93 | this limitation. */ | |
94 | max = 16; | |
95 | #else | |
9d782e8d MW |
96 | #ifdef HAVE_GETRLIMIT |
97 | struct rlimit rlim; | |
0b1fa288 | 98 | |
9d782e8d | 99 | if (getrlimit (RLIMIT_NOFILE, &rlim) == 0 |
d1eb5696 | 100 | && rlim.rlim_cur != (rlim_t) RLIM_INFINITY) |
9d782e8d MW |
101 | max = rlim.rlim_cur / 8; |
102 | else | |
0b1fa288 | 103 | #endif |
9d782e8d MW |
104 | #ifdef _SC_OPEN_MAX |
105 | max = sysconf (_SC_OPEN_MAX) / 8; | |
106 | #else | |
07d6d2b8 | 107 | max = 10; |
0b1fa288 ST |
108 | #endif |
109 | #endif /* not 32-bit Solaris */ | |
110 | ||
9d782e8d MW |
111 | max_open_files = max < 10 ? 10 : max; |
112 | } | |
113 | ||
114 | return max_open_files; | |
115 | } | |
d0fdd288 AM |
116 | |
117 | /* The number of BFD files we have open. */ | |
118 | ||
119 | static int open_files; | |
120 | ||
d00967c7 AM |
121 | /* Zero, or a pointer to the topmost BFD on the chain. This is |
122 | used by the <<bfd_cache_lookup>> macro in @file{libbfd.h} to | |
123 | determine when it can avoid a function call. */ | |
d0fdd288 | 124 | |
d00967c7 | 125 | static bfd *bfd_last_cache = NULL; |
252b5132 | 126 | |
d0fdd288 AM |
127 | /* Insert a BFD into the cache. */ |
128 | ||
129 | static void | |
130 | insert (bfd *abfd) | |
131 | { | |
132 | if (bfd_last_cache == NULL) | |
133 | { | |
134 | abfd->lru_next = abfd; | |
135 | abfd->lru_prev = abfd; | |
136 | } | |
137 | else | |
138 | { | |
139 | abfd->lru_next = bfd_last_cache; | |
140 | abfd->lru_prev = bfd_last_cache->lru_prev; | |
141 | abfd->lru_prev->lru_next = abfd; | |
142 | abfd->lru_next->lru_prev = abfd; | |
143 | } | |
144 | bfd_last_cache = abfd; | |
145 | } | |
146 | ||
147 | /* Remove a BFD from the cache. */ | |
148 | ||
149 | static void | |
150 | snip (bfd *abfd) | |
151 | { | |
152 | abfd->lru_prev->lru_next = abfd->lru_next; | |
153 | abfd->lru_next->lru_prev = abfd->lru_prev; | |
154 | if (abfd == bfd_last_cache) | |
155 | { | |
156 | bfd_last_cache = abfd->lru_next; | |
157 | if (abfd == bfd_last_cache) | |
158 | bfd_last_cache = NULL; | |
159 | } | |
160 | } | |
161 | ||
162 | /* Close a BFD and remove it from the cache. */ | |
163 | ||
164 | static bfd_boolean | |
165 | bfd_cache_delete (bfd *abfd) | |
166 | { | |
167 | bfd_boolean ret; | |
168 | ||
169 | if (fclose ((FILE *) abfd->iostream) == 0) | |
170 | ret = TRUE; | |
171 | else | |
172 | { | |
173 | ret = FALSE; | |
174 | bfd_set_error (bfd_error_system_call); | |
175 | } | |
176 | ||
177 | snip (abfd); | |
178 | ||
179 | abfd->iostream = NULL; | |
180 | --open_files; | |
181 | ||
182 | return ret; | |
183 | } | |
184 | ||
185 | /* We need to open a new file, and the cache is full. Find the least | |
186 | recently used cacheable BFD and close it. */ | |
187 | ||
188 | static bfd_boolean | |
189 | close_one (void) | |
190 | { | |
f664f618 | 191 | register bfd *to_kill; |
d0fdd288 AM |
192 | |
193 | if (bfd_last_cache == NULL) | |
f664f618 | 194 | to_kill = NULL; |
d0fdd288 AM |
195 | else |
196 | { | |
f664f618 TG |
197 | for (to_kill = bfd_last_cache->lru_prev; |
198 | ! to_kill->cacheable; | |
199 | to_kill = to_kill->lru_prev) | |
d0fdd288 | 200 | { |
f664f618 | 201 | if (to_kill == bfd_last_cache) |
d0fdd288 | 202 | { |
f664f618 | 203 | to_kill = NULL; |
d0fdd288 AM |
204 | break; |
205 | } | |
206 | } | |
207 | } | |
208 | ||
f664f618 | 209 | if (to_kill == NULL) |
d0fdd288 AM |
210 | { |
211 | /* There are no open cacheable BFD's. */ | |
212 | return TRUE; | |
213 | } | |
214 | ||
c7c3d11b | 215 | to_kill->where = _bfd_real_ftell ((FILE *) to_kill->iostream); |
d0fdd288 | 216 | |
f664f618 | 217 | return bfd_cache_delete (to_kill); |
d0fdd288 AM |
218 | } |
219 | ||
d00967c7 AM |
220 | /* Check to see if the required BFD is the same as the last one |
221 | looked up. If so, then it can use the stream in the BFD with | |
222 | impunity, since it can't have changed since the last lookup; | |
223 | otherwise, it has to perform the complicated lookup function. */ | |
d0fdd288 | 224 | |
95560129 | 225 | #define bfd_cache_lookup(x, flag) \ |
d00967c7 AM |
226 | ((x) == bfd_last_cache \ |
227 | ? (FILE *) (bfd_last_cache->iostream) \ | |
95560129 | 228 | : bfd_cache_lookup_worker (x, flag)) |
d0fdd288 | 229 | |
d00967c7 AM |
230 | /* Called when the macro <<bfd_cache_lookup>> fails to find a |
231 | quick answer. Find a file descriptor for @var{abfd}. If | |
232 | necessary, it open it. If there are already more than | |
9d782e8d | 233 | <<bfd_cache_max_open>> files open, it tries to close one first, to |
d00967c7 AM |
234 | avoid running out of file descriptors. It will return NULL |
235 | if it is unable to (re)open the @var{abfd}. */ | |
d0fdd288 | 236 | |
d00967c7 | 237 | static FILE * |
95560129 | 238 | bfd_cache_lookup_worker (bfd *abfd, enum cache_flag flag) |
d0fdd288 | 239 | { |
d0fdd288 AM |
240 | if ((abfd->flags & BFD_IN_MEMORY) != 0) |
241 | abort (); | |
242 | ||
5c4ce239 AM |
243 | if (abfd->my_archive != NULL |
244 | && !bfd_is_thin_archive (abfd->my_archive)) | |
245 | abort (); | |
d0fdd288 AM |
246 | |
247 | if (abfd->iostream != NULL) | |
248 | { | |
249 | /* Move the file to the start of the cache. */ | |
250 | if (abfd != bfd_last_cache) | |
251 | { | |
252 | snip (abfd); | |
253 | insert (abfd); | |
254 | } | |
255 | return (FILE *) abfd->iostream; | |
256 | } | |
257 | ||
95560129 AM |
258 | if (flag & CACHE_NO_OPEN) |
259 | return NULL; | |
260 | ||
d0fdd288 AM |
261 | if (bfd_open_file (abfd) == NULL) |
262 | ; | |
95560129 | 263 | else if (!(flag & CACHE_NO_SEEK) |
c7c3d11b PA |
264 | && _bfd_real_fseek ((FILE *) abfd->iostream, |
265 | abfd->where, SEEK_SET) != 0 | |
95560129 | 266 | && !(flag & CACHE_NO_SEEK_ERROR)) |
d0fdd288 AM |
267 | bfd_set_error (bfd_error_system_call); |
268 | else | |
269 | return (FILE *) abfd->iostream; | |
270 | ||
695344c0 | 271 | /* xgettext:c-format */ |
871b3ab2 | 272 | _bfd_error_handler (_("reopening %pB: %s\n"), |
5c4ce239 | 273 | abfd, bfd_errmsg (bfd_get_error ())); |
d0fdd288 AM |
274 | return NULL; |
275 | } | |
40838a72 AC |
276 | |
277 | static file_ptr | |
278 | cache_btell (struct bfd *abfd) | |
279 | { | |
95560129 | 280 | FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN); |
3dff57e8 | 281 | if (f == NULL) |
95560129 | 282 | return abfd->where; |
c7c3d11b | 283 | return _bfd_real_ftell (f); |
40838a72 AC |
284 | } |
285 | ||
286 | static int | |
287 | cache_bseek (struct bfd *abfd, file_ptr offset, int whence) | |
288 | { | |
a50b1753 | 289 | FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : CACHE_NORMAL); |
3dff57e8 AM |
290 | if (f == NULL) |
291 | return -1; | |
c7c3d11b | 292 | return _bfd_real_fseek (f, offset, whence); |
40838a72 AC |
293 | } |
294 | ||
295 | /* Note that archive entries don't have streams; they share their parent's. | |
296 | This allows someone to play with the iostream behind BFD's back. | |
297 | ||
298 | Also, note that the origin pointer points to the beginning of a file's | |
299 | contents (0 for non-archive elements). For archive entries this is the | |
300 | first octet in the file, NOT the beginning of the archive header. */ | |
301 | ||
302 | static file_ptr | |
5c4ce239 | 303 | cache_bread_1 (FILE *f, void *buf, file_ptr nbytes) |
40838a72 AC |
304 | { |
305 | file_ptr nread; | |
3dff57e8 | 306 | |
40838a72 AC |
307 | #if defined (__VAX) && defined (VMS) |
308 | /* Apparently fread on Vax VMS does not keep the record length | |
309 | information. */ | |
3dff57e8 | 310 | nread = read (fileno (f), buf, nbytes); |
40838a72 AC |
311 | /* Set bfd_error if we did not read as much data as we expected. If |
312 | the read failed due to an error set the bfd_error_system_call, | |
313 | else set bfd_error_file_truncated. */ | |
314 | if (nread == (file_ptr)-1) | |
315 | { | |
316 | bfd_set_error (bfd_error_system_call); | |
87f14779 | 317 | return nread; |
40838a72 AC |
318 | } |
319 | #else | |
3dff57e8 | 320 | nread = fread (buf, 1, nbytes, f); |
40838a72 AC |
321 | /* Set bfd_error if we did not read as much data as we expected. If |
322 | the read failed due to an error set the bfd_error_system_call, | |
323 | else set bfd_error_file_truncated. */ | |
3dff57e8 | 324 | if (nread < nbytes && ferror (f)) |
40838a72 AC |
325 | { |
326 | bfd_set_error (bfd_error_system_call); | |
87f14779 | 327 | return nread; |
40838a72 AC |
328 | } |
329 | #endif | |
662ed161 DJ |
330 | if (nread < nbytes) |
331 | /* This may or may not be an error, but in case the calling code | |
332 | bails out because of it, set the right error code. */ | |
333 | bfd_set_error (bfd_error_file_truncated); | |
40838a72 AC |
334 | return nread; |
335 | } | |
336 | ||
f12a02c0 JB |
337 | static file_ptr |
338 | cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes) | |
339 | { | |
340 | file_ptr nread = 0; | |
5c4ce239 AM |
341 | FILE *f; |
342 | ||
343 | f = bfd_cache_lookup (abfd, CACHE_NORMAL); | |
344 | if (f == NULL) | |
345 | return -1; | |
f12a02c0 JB |
346 | |
347 | /* Some filesystems are unable to handle reads that are too large | |
348 | (for instance, NetApp shares with oplocks turned off). To avoid | |
349 | hitting this limitation, we read the buffer in chunks of 8MB max. */ | |
350 | while (nread < nbytes) | |
351 | { | |
352 | const file_ptr max_chunk_size = 0x800000; | |
353 | file_ptr chunk_size = nbytes - nread; | |
354 | file_ptr chunk_nread; | |
355 | ||
356 | if (chunk_size > max_chunk_size) | |
07d6d2b8 | 357 | chunk_size = max_chunk_size; |
f12a02c0 | 358 | |
5c4ce239 | 359 | chunk_nread = cache_bread_1 (f, (char *) buf + nread, chunk_size); |
f12a02c0 JB |
360 | |
361 | /* Update the nread count. | |
362 | ||
07d6d2b8 AM |
363 | We just have to be careful of the case when cache_bread_1 returns |
364 | a negative count: If this is our first read, then set nread to | |
365 | that negative count in order to return that negative value to the | |
366 | caller. Otherwise, don't add it to our total count, or we would | |
367 | end up returning a smaller number of bytes read than we actually | |
368 | did. */ | |
f12a02c0 | 369 | if (nread == 0 || chunk_nread > 0) |
07d6d2b8 | 370 | nread += chunk_nread; |
f12a02c0 JB |
371 | |
372 | if (chunk_nread < chunk_size) | |
07d6d2b8 | 373 | break; |
f12a02c0 JB |
374 | } |
375 | ||
376 | return nread; | |
377 | } | |
378 | ||
40838a72 | 379 | static file_ptr |
5c4ce239 | 380 | cache_bwrite (struct bfd *abfd, const void *from, file_ptr nbytes) |
40838a72 | 381 | { |
3dff57e8 | 382 | file_ptr nwrite; |
a50b1753 | 383 | FILE *f = bfd_cache_lookup (abfd, CACHE_NORMAL); |
cb5220a0 | 384 | |
3dff57e8 AM |
385 | if (f == NULL) |
386 | return 0; | |
5c4ce239 | 387 | nwrite = fwrite (from, 1, nbytes, f); |
3dff57e8 | 388 | if (nwrite < nbytes && ferror (f)) |
40838a72 AC |
389 | { |
390 | bfd_set_error (bfd_error_system_call); | |
391 | return -1; | |
392 | } | |
393 | return nwrite; | |
394 | } | |
395 | ||
405bf443 | 396 | static int |
40838a72 AC |
397 | cache_bclose (struct bfd *abfd) |
398 | { | |
405bf443 | 399 | return bfd_cache_close (abfd) - 1; |
40838a72 AC |
400 | } |
401 | ||
402 | static int | |
403 | cache_bflush (struct bfd *abfd) | |
404 | { | |
3dff57e8 | 405 | int sts; |
95560129 | 406 | FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN); |
cb5220a0 | 407 | |
3dff57e8 | 408 | if (f == NULL) |
95560129 | 409 | return 0; |
3dff57e8 | 410 | sts = fflush (f); |
40838a72 AC |
411 | if (sts < 0) |
412 | bfd_set_error (bfd_error_system_call); | |
413 | return sts; | |
414 | } | |
415 | ||
416 | static int | |
417 | cache_bstat (struct bfd *abfd, struct stat *sb) | |
418 | { | |
3dff57e8 | 419 | int sts; |
95560129 | 420 | FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR); |
cb5220a0 | 421 | |
3dff57e8 AM |
422 | if (f == NULL) |
423 | return -1; | |
424 | sts = fstat (fileno (f), sb); | |
40838a72 AC |
425 | if (sts < 0) |
426 | bfd_set_error (bfd_error_system_call); | |
427 | return sts; | |
428 | } | |
429 | ||
25b88f33 PP |
430 | static void * |
431 | cache_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED, | |
432 | void *addr ATTRIBUTE_UNUSED, | |
433 | bfd_size_type len ATTRIBUTE_UNUSED, | |
434 | int prot ATTRIBUTE_UNUSED, | |
435 | int flags ATTRIBUTE_UNUSED, | |
4c95ab76 | 436 | file_ptr offset ATTRIBUTE_UNUSED, |
07d6d2b8 AM |
437 | void **map_addr ATTRIBUTE_UNUSED, |
438 | bfd_size_type *map_len ATTRIBUTE_UNUSED) | |
25b88f33 PP |
439 | { |
440 | void *ret = (void *) -1; | |
441 | ||
442 | if ((abfd->flags & BFD_IN_MEMORY) != 0) | |
443 | abort (); | |
444 | #ifdef HAVE_MMAP | |
445 | else | |
446 | { | |
48d96f80 | 447 | static uintptr_t pagesize_m1; |
4c95ab76 TG |
448 | FILE *f; |
449 | file_ptr pg_offset; | |
450 | bfd_size_type pg_len; | |
451 | ||
452 | f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR); | |
25b88f33 PP |
453 | if (f == NULL) |
454 | return ret; | |
455 | ||
48d96f80 | 456 | if (pagesize_m1 == 0) |
07d6d2b8 | 457 | pagesize_m1 = getpagesize () - 1; |
48d96f80 | 458 | |
4c95ab76 TG |
459 | /* Align. */ |
460 | pg_offset = offset & ~pagesize_m1; | |
461 | pg_len = (len + (offset - pg_offset) + pagesize_m1) & ~pagesize_m1; | |
462 | ||
463 | ret = mmap (addr, pg_len, prot, flags, fileno (f), pg_offset); | |
25b88f33 PP |
464 | if (ret == (void *) -1) |
465 | bfd_set_error (bfd_error_system_call); | |
4c95ab76 | 466 | else |
07d6d2b8 AM |
467 | { |
468 | *map_addr = ret; | |
469 | *map_len = pg_len; | |
470 | ret = (char *) ret + (offset & pagesize_m1); | |
471 | } | |
25b88f33 PP |
472 | } |
473 | #endif | |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
cb5220a0 NC |
478 | static const struct bfd_iovec cache_iovec = |
479 | { | |
40838a72 | 480 | &cache_bread, &cache_bwrite, &cache_btell, &cache_bseek, |
25b88f33 | 481 | &cache_bclose, &cache_bflush, &cache_bstat, &cache_bmmap |
40838a72 AC |
482 | }; |
483 | ||
252b5132 RH |
484 | /* |
485 | INTERNAL_FUNCTION | |
486 | bfd_cache_init | |
487 | ||
488 | SYNOPSIS | |
b34976b6 | 489 | bfd_boolean bfd_cache_init (bfd *abfd); |
252b5132 RH |
490 | |
491 | DESCRIPTION | |
492 | Add a newly opened BFD to the cache. | |
493 | */ | |
494 | ||
b34976b6 | 495 | bfd_boolean |
c58b9523 | 496 | bfd_cache_init (bfd *abfd) |
252b5132 RH |
497 | { |
498 | BFD_ASSERT (abfd->iostream != NULL); | |
9d782e8d | 499 | if (open_files >= bfd_cache_max_open ()) |
252b5132 RH |
500 | { |
501 | if (! close_one ()) | |
b34976b6 | 502 | return FALSE; |
252b5132 | 503 | } |
40838a72 | 504 | abfd->iovec = &cache_iovec; |
252b5132 RH |
505 | insert (abfd); |
506 | ++open_files; | |
b34976b6 | 507 | return TRUE; |
252b5132 RH |
508 | } |
509 | ||
510 | /* | |
511 | INTERNAL_FUNCTION | |
512 | bfd_cache_close | |
513 | ||
514 | SYNOPSIS | |
b34976b6 | 515 | bfd_boolean bfd_cache_close (bfd *abfd); |
252b5132 RH |
516 | |
517 | DESCRIPTION | |
518 | Remove the BFD @var{abfd} from the cache. If the attached file is open, | |
519 | then close it too. | |
520 | ||
521 | RETURNS | |
b34976b6 | 522 | <<FALSE>> is returned if closing the file fails, <<TRUE>> is |
252b5132 RH |
523 | returned if all is well. |
524 | */ | |
525 | ||
b34976b6 | 526 | bfd_boolean |
c58b9523 | 527 | bfd_cache_close (bfd *abfd) |
252b5132 | 528 | { |
40838a72 | 529 | if (abfd->iovec != &cache_iovec) |
b34976b6 | 530 | return TRUE; |
252b5132 | 531 | |
fe2e161a AC |
532 | if (abfd->iostream == NULL) |
533 | /* Previously closed. */ | |
534 | return TRUE; | |
535 | ||
252b5132 RH |
536 | return bfd_cache_delete (abfd); |
537 | } | |
538 | ||
02d5a37b JG |
539 | /* |
540 | FUNCTION | |
541 | bfd_cache_close_all | |
542 | ||
543 | SYNOPSIS | |
544 | bfd_boolean bfd_cache_close_all (void); | |
545 | ||
546 | DESCRIPTION | |
547 | Remove all BFDs from the cache. If the attached file is open, | |
548 | then close it too. | |
549 | ||
550 | RETURNS | |
551 | <<FALSE>> is returned if closing one of the file fails, <<TRUE>> is | |
552 | returned if all is well. | |
553 | */ | |
554 | ||
555 | bfd_boolean | |
e6c7cdec | 556 | bfd_cache_close_all (void) |
02d5a37b JG |
557 | { |
558 | bfd_boolean ret = TRUE; | |
559 | ||
560 | while (bfd_last_cache != NULL) | |
561 | ret &= bfd_cache_close (bfd_last_cache); | |
c9b549b2 JG |
562 | |
563 | return ret; | |
02d5a37b JG |
564 | } |
565 | ||
252b5132 RH |
566 | /* |
567 | INTERNAL_FUNCTION | |
568 | bfd_open_file | |
569 | ||
570 | SYNOPSIS | |
c58b9523 | 571 | FILE* bfd_open_file (bfd *abfd); |
252b5132 RH |
572 | |
573 | DESCRIPTION | |
574 | Call the OS to open a file for @var{abfd}. Return the <<FILE *>> | |
575 | (possibly <<NULL>>) that results from this operation. Set up the | |
576 | BFD so that future accesses know the file is open. If the <<FILE *>> | |
577 | returned is <<NULL>>, then it won't have been put in the | |
578 | cache, so it won't have to be removed from it. | |
579 | */ | |
580 | ||
581 | FILE * | |
c58b9523 | 582 | bfd_open_file (bfd *abfd) |
252b5132 | 583 | { |
b34976b6 | 584 | abfd->cacheable = TRUE; /* Allow it to be closed later. */ |
252b5132 | 585 | |
9d782e8d | 586 | if (open_files >= bfd_cache_max_open ()) |
252b5132 RH |
587 | { |
588 | if (! close_one ()) | |
589 | return NULL; | |
590 | } | |
591 | ||
592 | switch (abfd->direction) | |
593 | { | |
594 | case read_direction: | |
595 | case no_direction: | |
c7c3d11b | 596 | abfd->iostream = _bfd_real_fopen (abfd->filename, FOPEN_RB); |
252b5132 RH |
597 | break; |
598 | case both_direction: | |
599 | case write_direction: | |
82e51918 | 600 | if (abfd->opened_once) |
252b5132 | 601 | { |
c7c3d11b | 602 | abfd->iostream = _bfd_real_fopen (abfd->filename, FOPEN_RUB); |
252b5132 | 603 | if (abfd->iostream == NULL) |
c7c3d11b | 604 | abfd->iostream = _bfd_real_fopen (abfd->filename, FOPEN_WUB); |
252b5132 RH |
605 | } |
606 | else | |
607 | { | |
9e422a2e ILT |
608 | /* Create the file. |
609 | ||
610 | Some operating systems won't let us overwrite a running | |
611 | binary. For them, we want to unlink the file first. | |
612 | ||
613 | However, gcc 2.95 will create temporary files using | |
614 | O_EXCL and tight permissions to prevent other users from | |
615 | substituting other .o files during the compilation. gcc | |
616 | will then tell the assembler to use the newly created | |
617 | file as an output file. If we unlink the file here, we | |
618 | open a brief window when another user could still | |
619 | substitute a file. | |
620 | ||
621 | So we unlink the output file if and only if it has | |
622 | non-zero size. */ | |
5af11cab AM |
623 | #ifndef __MSDOS__ |
624 | /* Don't do this for MSDOS: it doesn't care about overwriting | |
625 | a running binary, but if this file is already open by | |
626 | another BFD, we will be in deep trouble if we delete an | |
627 | open file. In fact, objdump does just that if invoked with | |
628 | the --info option. */ | |
9e422a2e ILT |
629 | struct stat s; |
630 | ||
631 | if (stat (abfd->filename, &s) == 0 && s.st_size != 0) | |
bb14f524 | 632 | unlink_if_ordinary (abfd->filename); |
5af11cab | 633 | #endif |
c7c3d11b | 634 | abfd->iostream = _bfd_real_fopen (abfd->filename, FOPEN_WUB); |
b34976b6 | 635 | abfd->opened_once = TRUE; |
252b5132 RH |
636 | } |
637 | break; | |
638 | } | |
639 | ||
5c91cdfb AM |
640 | if (abfd->iostream == NULL) |
641 | bfd_set_error (bfd_error_system_call); | |
642 | else | |
252b5132 RH |
643 | { |
644 | if (! bfd_cache_init (abfd)) | |
645 | return NULL; | |
646 | } | |
647 | ||
648 | return (FILE *) abfd->iostream; | |
649 | } |