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252b5132 | 1 | /* BFD library -- caching of file descriptors. |
7c192733 | 2 | |
a2c58332 | 3 | Copyright (C) 1990-2022 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" |
252b5132 | 47 | |
25b88f33 PP |
48 | #ifdef HAVE_MMAP |
49 | #include <sys/mman.h> | |
50 | #endif | |
51 | ||
95560129 AM |
52 | /* In some cases we can optimize cache operation when reopening files. |
53 | For instance, a flush is entirely unnecessary if the file is already | |
54 | closed, so a flush would use CACHE_NO_OPEN. Similarly, a seek using | |
55 | SEEK_SET or SEEK_END need not first seek to the current position. | |
56 | For stat we ignore seek errors, just in case the file has changed | |
57 | while we weren't looking. If it has, then it's possible that the | |
58 | file is shorter and we don't want a seek error to prevent us doing | |
59 | the stat. */ | |
60 | enum cache_flag { | |
61 | CACHE_NORMAL = 0, | |
62 | CACHE_NO_OPEN = 1, | |
63 | CACHE_NO_SEEK = 2, | |
64 | CACHE_NO_SEEK_ERROR = 4 | |
65 | }; | |
66 | ||
d00967c7 | 67 | /* The maximum number of files which the cache will keep open at |
9d782e8d | 68 | one time. When needed call bfd_cache_max_open to initialize. */ |
d0fdd288 | 69 | |
9d782e8d MW |
70 | static int max_open_files = 0; |
71 | ||
72 | /* Set max_open_files, if not already set, to 12.5% of the allowed open | |
73 | file descriptors, but at least 10, and return the value. */ | |
74 | static int | |
75 | bfd_cache_max_open (void) | |
76 | { | |
77 | if (max_open_files == 0) | |
78 | { | |
79 | int max; | |
0b1fa288 ST |
80 | #if defined(__sun) && !defined(__sparcv9) && !defined(__x86_64__) |
81 | /* PR ld/19260: 32-bit Solaris has very inelegant handling of the 255 | |
82 | file descriptor limit. The problem is that setrlimit(2) can raise | |
83 | RLIMIT_NOFILE to a value that is not supported by libc, resulting | |
07d6d2b8 | 84 | in "Too many open files" errors. This can happen here even though |
0b1fa288 ST |
85 | max_open_files is set to rlim.rlim_cur / 8. For example, if |
86 | a parent process has set rlim.rlim_cur to 65536, then max_open_files | |
87 | will be computed as 8192. | |
88 | ||
89 | This check essentially reverts to the behavior from binutils 2.23.1 | |
07d6d2b8 | 90 | for 32-bit Solaris only. (It is hoped that the 32-bit libc |
0b1fa288 ST |
91 | limitation will be removed soon). 64-bit Solaris libc does not have |
92 | this limitation. */ | |
93 | max = 16; | |
94 | #else | |
9d782e8d MW |
95 | #ifdef HAVE_GETRLIMIT |
96 | struct rlimit rlim; | |
0b1fa288 | 97 | |
9d782e8d | 98 | if (getrlimit (RLIMIT_NOFILE, &rlim) == 0 |
d1eb5696 | 99 | && rlim.rlim_cur != (rlim_t) RLIM_INFINITY) |
9d782e8d MW |
100 | max = rlim.rlim_cur / 8; |
101 | else | |
0b1fa288 | 102 | #endif |
9d782e8d MW |
103 | #ifdef _SC_OPEN_MAX |
104 | max = sysconf (_SC_OPEN_MAX) / 8; | |
105 | #else | |
07d6d2b8 | 106 | max = 10; |
0b1fa288 ST |
107 | #endif |
108 | #endif /* not 32-bit Solaris */ | |
109 | ||
9d782e8d MW |
110 | max_open_files = max < 10 ? 10 : max; |
111 | } | |
112 | ||
113 | return max_open_files; | |
114 | } | |
d0fdd288 AM |
115 | |
116 | /* The number of BFD files we have open. */ | |
117 | ||
118 | static int open_files; | |
119 | ||
d00967c7 AM |
120 | /* Zero, or a pointer to the topmost BFD on the chain. This is |
121 | used by the <<bfd_cache_lookup>> macro in @file{libbfd.h} to | |
122 | determine when it can avoid a function call. */ | |
d0fdd288 | 123 | |
d00967c7 | 124 | static bfd *bfd_last_cache = NULL; |
252b5132 | 125 | |
d0fdd288 AM |
126 | /* Insert a BFD into the cache. */ |
127 | ||
128 | static void | |
129 | insert (bfd *abfd) | |
130 | { | |
131 | if (bfd_last_cache == NULL) | |
132 | { | |
133 | abfd->lru_next = abfd; | |
134 | abfd->lru_prev = abfd; | |
135 | } | |
136 | else | |
137 | { | |
138 | abfd->lru_next = bfd_last_cache; | |
139 | abfd->lru_prev = bfd_last_cache->lru_prev; | |
140 | abfd->lru_prev->lru_next = abfd; | |
141 | abfd->lru_next->lru_prev = abfd; | |
142 | } | |
143 | bfd_last_cache = abfd; | |
144 | } | |
145 | ||
146 | /* Remove a BFD from the cache. */ | |
147 | ||
148 | static void | |
149 | snip (bfd *abfd) | |
150 | { | |
151 | abfd->lru_prev->lru_next = abfd->lru_next; | |
152 | abfd->lru_next->lru_prev = abfd->lru_prev; | |
153 | if (abfd == bfd_last_cache) | |
154 | { | |
155 | bfd_last_cache = abfd->lru_next; | |
156 | if (abfd == bfd_last_cache) | |
157 | bfd_last_cache = NULL; | |
158 | } | |
159 | } | |
160 | ||
161 | /* Close a BFD and remove it from the cache. */ | |
162 | ||
0a1b45a2 | 163 | static bool |
d0fdd288 AM |
164 | bfd_cache_delete (bfd *abfd) |
165 | { | |
0a1b45a2 | 166 | bool ret; |
d0fdd288 AM |
167 | |
168 | if (fclose ((FILE *) abfd->iostream) == 0) | |
0a1b45a2 | 169 | ret = true; |
d0fdd288 AM |
170 | else |
171 | { | |
0a1b45a2 | 172 | ret = false; |
d0fdd288 AM |
173 | bfd_set_error (bfd_error_system_call); |
174 | } | |
175 | ||
176 | snip (abfd); | |
177 | ||
178 | abfd->iostream = NULL; | |
179 | --open_files; | |
a6ad7914 | 180 | abfd->flags |= BFD_CLOSED_BY_CACHE; |
d0fdd288 AM |
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 | ||
0a1b45a2 | 188 | static bool |
d0fdd288 AM |
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. */ | |
0a1b45a2 | 212 | return true; |
d0fdd288 AM |
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 | |
a6ad7914 AM |
269 | { |
270 | abfd->flags &= ~BFD_CLOSED_BY_CACHE; | |
271 | return (FILE *) abfd->iostream; | |
272 | } | |
d0fdd288 | 273 | |
695344c0 | 274 | /* xgettext:c-format */ |
a6ad7914 | 275 | _bfd_error_handler (_("reopening %pB: %s"), |
5c4ce239 | 276 | abfd, bfd_errmsg (bfd_get_error ())); |
d0fdd288 AM |
277 | return NULL; |
278 | } | |
40838a72 AC |
279 | |
280 | static file_ptr | |
281 | cache_btell (struct bfd *abfd) | |
282 | { | |
95560129 | 283 | FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN); |
3dff57e8 | 284 | if (f == NULL) |
95560129 | 285 | return abfd->where; |
c7c3d11b | 286 | return _bfd_real_ftell (f); |
40838a72 AC |
287 | } |
288 | ||
289 | static int | |
290 | cache_bseek (struct bfd *abfd, file_ptr offset, int whence) | |
291 | { | |
a50b1753 | 292 | FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : CACHE_NORMAL); |
3dff57e8 AM |
293 | if (f == NULL) |
294 | return -1; | |
c7c3d11b | 295 | return _bfd_real_fseek (f, offset, whence); |
40838a72 AC |
296 | } |
297 | ||
298 | /* Note that archive entries don't have streams; they share their parent's. | |
299 | This allows someone to play with the iostream behind BFD's back. | |
300 | ||
301 | Also, note that the origin pointer points to the beginning of a file's | |
302 | contents (0 for non-archive elements). For archive entries this is the | |
303 | first octet in the file, NOT the beginning of the archive header. */ | |
304 | ||
305 | static file_ptr | |
5c4ce239 | 306 | cache_bread_1 (FILE *f, void *buf, file_ptr nbytes) |
40838a72 AC |
307 | { |
308 | file_ptr nread; | |
3dff57e8 | 309 | |
40838a72 AC |
310 | #if defined (__VAX) && defined (VMS) |
311 | /* Apparently fread on Vax VMS does not keep the record length | |
312 | information. */ | |
3dff57e8 | 313 | nread = read (fileno (f), buf, nbytes); |
40838a72 AC |
314 | /* Set bfd_error if we did not read as much data as we expected. If |
315 | the read failed due to an error set the bfd_error_system_call, | |
316 | else set bfd_error_file_truncated. */ | |
317 | if (nread == (file_ptr)-1) | |
318 | { | |
319 | bfd_set_error (bfd_error_system_call); | |
87f14779 | 320 | return nread; |
40838a72 AC |
321 | } |
322 | #else | |
3dff57e8 | 323 | nread = fread (buf, 1, nbytes, f); |
40838a72 AC |
324 | /* Set bfd_error if we did not read as much data as we expected. If |
325 | the read failed due to an error set the bfd_error_system_call, | |
326 | else set bfd_error_file_truncated. */ | |
3dff57e8 | 327 | if (nread < nbytes && ferror (f)) |
40838a72 AC |
328 | { |
329 | bfd_set_error (bfd_error_system_call); | |
87f14779 | 330 | return nread; |
40838a72 AC |
331 | } |
332 | #endif | |
662ed161 DJ |
333 | if (nread < nbytes) |
334 | /* This may or may not be an error, but in case the calling code | |
335 | bails out because of it, set the right error code. */ | |
336 | bfd_set_error (bfd_error_file_truncated); | |
40838a72 AC |
337 | return nread; |
338 | } | |
339 | ||
f12a02c0 JB |
340 | static file_ptr |
341 | cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes) | |
342 | { | |
343 | file_ptr nread = 0; | |
5c4ce239 AM |
344 | FILE *f; |
345 | ||
346 | f = bfd_cache_lookup (abfd, CACHE_NORMAL); | |
347 | if (f == NULL) | |
348 | return -1; | |
f12a02c0 JB |
349 | |
350 | /* Some filesystems are unable to handle reads that are too large | |
351 | (for instance, NetApp shares with oplocks turned off). To avoid | |
352 | hitting this limitation, we read the buffer in chunks of 8MB max. */ | |
353 | while (nread < nbytes) | |
354 | { | |
355 | const file_ptr max_chunk_size = 0x800000; | |
356 | file_ptr chunk_size = nbytes - nread; | |
357 | file_ptr chunk_nread; | |
358 | ||
359 | if (chunk_size > max_chunk_size) | |
07d6d2b8 | 360 | chunk_size = max_chunk_size; |
f12a02c0 | 361 | |
5c4ce239 | 362 | chunk_nread = cache_bread_1 (f, (char *) buf + nread, chunk_size); |
f12a02c0 JB |
363 | |
364 | /* Update the nread count. | |
365 | ||
07d6d2b8 AM |
366 | We just have to be careful of the case when cache_bread_1 returns |
367 | a negative count: If this is our first read, then set nread to | |
368 | that negative count in order to return that negative value to the | |
369 | caller. Otherwise, don't add it to our total count, or we would | |
370 | end up returning a smaller number of bytes read than we actually | |
371 | did. */ | |
f12a02c0 | 372 | if (nread == 0 || chunk_nread > 0) |
07d6d2b8 | 373 | nread += chunk_nread; |
f12a02c0 JB |
374 | |
375 | if (chunk_nread < chunk_size) | |
07d6d2b8 | 376 | break; |
f12a02c0 JB |
377 | } |
378 | ||
379 | return nread; | |
380 | } | |
381 | ||
40838a72 | 382 | static file_ptr |
5c4ce239 | 383 | cache_bwrite (struct bfd *abfd, const void *from, file_ptr nbytes) |
40838a72 | 384 | { |
3dff57e8 | 385 | file_ptr nwrite; |
a50b1753 | 386 | FILE *f = bfd_cache_lookup (abfd, CACHE_NORMAL); |
cb5220a0 | 387 | |
3dff57e8 AM |
388 | if (f == NULL) |
389 | return 0; | |
5c4ce239 | 390 | nwrite = fwrite (from, 1, nbytes, f); |
3dff57e8 | 391 | if (nwrite < nbytes && ferror (f)) |
40838a72 AC |
392 | { |
393 | bfd_set_error (bfd_error_system_call); | |
394 | return -1; | |
395 | } | |
396 | return nwrite; | |
397 | } | |
398 | ||
405bf443 | 399 | static int |
40838a72 AC |
400 | cache_bclose (struct bfd *abfd) |
401 | { | |
405bf443 | 402 | return bfd_cache_close (abfd) - 1; |
40838a72 AC |
403 | } |
404 | ||
405 | static int | |
406 | cache_bflush (struct bfd *abfd) | |
407 | { | |
3dff57e8 | 408 | int sts; |
95560129 | 409 | FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN); |
cb5220a0 | 410 | |
3dff57e8 | 411 | if (f == NULL) |
95560129 | 412 | return 0; |
3dff57e8 | 413 | sts = fflush (f); |
40838a72 AC |
414 | if (sts < 0) |
415 | bfd_set_error (bfd_error_system_call); | |
416 | return sts; | |
417 | } | |
418 | ||
419 | static int | |
420 | cache_bstat (struct bfd *abfd, struct stat *sb) | |
421 | { | |
3dff57e8 | 422 | int sts; |
95560129 | 423 | FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR); |
cb5220a0 | 424 | |
3dff57e8 AM |
425 | if (f == NULL) |
426 | return -1; | |
427 | sts = fstat (fileno (f), sb); | |
40838a72 AC |
428 | if (sts < 0) |
429 | bfd_set_error (bfd_error_system_call); | |
430 | return sts; | |
431 | } | |
432 | ||
25b88f33 PP |
433 | static void * |
434 | cache_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED, | |
435 | void *addr ATTRIBUTE_UNUSED, | |
436 | bfd_size_type len ATTRIBUTE_UNUSED, | |
437 | int prot ATTRIBUTE_UNUSED, | |
438 | int flags ATTRIBUTE_UNUSED, | |
4c95ab76 | 439 | file_ptr offset ATTRIBUTE_UNUSED, |
07d6d2b8 AM |
440 | void **map_addr ATTRIBUTE_UNUSED, |
441 | bfd_size_type *map_len ATTRIBUTE_UNUSED) | |
25b88f33 PP |
442 | { |
443 | void *ret = (void *) -1; | |
444 | ||
445 | if ((abfd->flags & BFD_IN_MEMORY) != 0) | |
446 | abort (); | |
447 | #ifdef HAVE_MMAP | |
448 | else | |
449 | { | |
48d96f80 | 450 | static uintptr_t pagesize_m1; |
4c95ab76 TG |
451 | FILE *f; |
452 | file_ptr pg_offset; | |
453 | bfd_size_type pg_len; | |
454 | ||
455 | f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR); | |
25b88f33 PP |
456 | if (f == NULL) |
457 | return ret; | |
458 | ||
48d96f80 | 459 | if (pagesize_m1 == 0) |
07d6d2b8 | 460 | pagesize_m1 = getpagesize () - 1; |
48d96f80 | 461 | |
4c95ab76 TG |
462 | /* Align. */ |
463 | pg_offset = offset & ~pagesize_m1; | |
464 | pg_len = (len + (offset - pg_offset) + pagesize_m1) & ~pagesize_m1; | |
465 | ||
466 | ret = mmap (addr, pg_len, prot, flags, fileno (f), pg_offset); | |
25b88f33 PP |
467 | if (ret == (void *) -1) |
468 | bfd_set_error (bfd_error_system_call); | |
4c95ab76 | 469 | else |
07d6d2b8 AM |
470 | { |
471 | *map_addr = ret; | |
472 | *map_len = pg_len; | |
473 | ret = (char *) ret + (offset & pagesize_m1); | |
474 | } | |
25b88f33 PP |
475 | } |
476 | #endif | |
477 | ||
478 | return ret; | |
479 | } | |
480 | ||
cb5220a0 NC |
481 | static const struct bfd_iovec cache_iovec = |
482 | { | |
40838a72 | 483 | &cache_bread, &cache_bwrite, &cache_btell, &cache_bseek, |
25b88f33 | 484 | &cache_bclose, &cache_bflush, &cache_bstat, &cache_bmmap |
40838a72 AC |
485 | }; |
486 | ||
252b5132 RH |
487 | /* |
488 | INTERNAL_FUNCTION | |
489 | bfd_cache_init | |
490 | ||
491 | SYNOPSIS | |
0a1b45a2 | 492 | bool bfd_cache_init (bfd *abfd); |
252b5132 RH |
493 | |
494 | DESCRIPTION | |
495 | Add a newly opened BFD to the cache. | |
496 | */ | |
497 | ||
0a1b45a2 | 498 | bool |
c58b9523 | 499 | bfd_cache_init (bfd *abfd) |
252b5132 RH |
500 | { |
501 | BFD_ASSERT (abfd->iostream != NULL); | |
9d782e8d | 502 | if (open_files >= bfd_cache_max_open ()) |
252b5132 RH |
503 | { |
504 | if (! close_one ()) | |
0a1b45a2 | 505 | return false; |
252b5132 | 506 | } |
40838a72 | 507 | abfd->iovec = &cache_iovec; |
252b5132 RH |
508 | insert (abfd); |
509 | ++open_files; | |
0a1b45a2 | 510 | return true; |
252b5132 RH |
511 | } |
512 | ||
513 | /* | |
514 | INTERNAL_FUNCTION | |
515 | bfd_cache_close | |
516 | ||
517 | SYNOPSIS | |
0a1b45a2 | 518 | bool bfd_cache_close (bfd *abfd); |
252b5132 RH |
519 | |
520 | DESCRIPTION | |
521 | Remove the BFD @var{abfd} from the cache. If the attached file is open, | |
522 | then close it too. | |
523 | ||
524 | RETURNS | |
b34976b6 | 525 | <<FALSE>> is returned if closing the file fails, <<TRUE>> is |
252b5132 RH |
526 | returned if all is well. |
527 | */ | |
528 | ||
0a1b45a2 | 529 | bool |
c58b9523 | 530 | bfd_cache_close (bfd *abfd) |
252b5132 | 531 | { |
40838a72 | 532 | if (abfd->iovec != &cache_iovec) |
0a1b45a2 | 533 | return true; |
252b5132 | 534 | |
fe2e161a AC |
535 | if (abfd->iostream == NULL) |
536 | /* Previously closed. */ | |
0a1b45a2 | 537 | return true; |
fe2e161a | 538 | |
252b5132 RH |
539 | return bfd_cache_delete (abfd); |
540 | } | |
541 | ||
02d5a37b JG |
542 | /* |
543 | FUNCTION | |
544 | bfd_cache_close_all | |
545 | ||
546 | SYNOPSIS | |
0a1b45a2 | 547 | bool bfd_cache_close_all (void); |
02d5a37b JG |
548 | |
549 | DESCRIPTION | |
550 | Remove all BFDs from the cache. If the attached file is open, | |
551 | then close it too. | |
552 | ||
553 | RETURNS | |
554 | <<FALSE>> is returned if closing one of the file fails, <<TRUE>> is | |
555 | returned if all is well. | |
556 | */ | |
557 | ||
0a1b45a2 | 558 | bool |
e6c7cdec | 559 | bfd_cache_close_all (void) |
02d5a37b | 560 | { |
0a1b45a2 | 561 | bool ret = true; |
02d5a37b JG |
562 | |
563 | while (bfd_last_cache != NULL) | |
564 | ret &= bfd_cache_close (bfd_last_cache); | |
c9b549b2 JG |
565 | |
566 | return ret; | |
02d5a37b JG |
567 | } |
568 | ||
252b5132 RH |
569 | /* |
570 | INTERNAL_FUNCTION | |
571 | bfd_open_file | |
572 | ||
573 | SYNOPSIS | |
c58b9523 | 574 | FILE* bfd_open_file (bfd *abfd); |
252b5132 RH |
575 | |
576 | DESCRIPTION | |
577 | Call the OS to open a file for @var{abfd}. Return the <<FILE *>> | |
578 | (possibly <<NULL>>) that results from this operation. Set up the | |
579 | BFD so that future accesses know the file is open. If the <<FILE *>> | |
580 | returned is <<NULL>>, then it won't have been put in the | |
581 | cache, so it won't have to be removed from it. | |
582 | */ | |
583 | ||
584 | FILE * | |
c58b9523 | 585 | bfd_open_file (bfd *abfd) |
252b5132 | 586 | { |
0a1b45a2 | 587 | abfd->cacheable = true; /* Allow it to be closed later. */ |
252b5132 | 588 | |
9d782e8d | 589 | if (open_files >= bfd_cache_max_open ()) |
252b5132 RH |
590 | { |
591 | if (! close_one ()) | |
592 | return NULL; | |
593 | } | |
594 | ||
595 | switch (abfd->direction) | |
596 | { | |
597 | case read_direction: | |
598 | case no_direction: | |
765cf5f6 | 599 | abfd->iostream = _bfd_real_fopen (bfd_get_filename (abfd), FOPEN_RB); |
252b5132 RH |
600 | break; |
601 | case both_direction: | |
602 | case write_direction: | |
82e51918 | 603 | if (abfd->opened_once) |
252b5132 | 604 | { |
765cf5f6 AM |
605 | abfd->iostream = _bfd_real_fopen (bfd_get_filename (abfd), |
606 | FOPEN_RUB); | |
252b5132 | 607 | if (abfd->iostream == NULL) |
765cf5f6 AM |
608 | abfd->iostream = _bfd_real_fopen (bfd_get_filename (abfd), |
609 | FOPEN_WUB); | |
252b5132 RH |
610 | } |
611 | else | |
612 | { | |
9e422a2e ILT |
613 | /* Create the file. |
614 | ||
615 | Some operating systems won't let us overwrite a running | |
616 | binary. For them, we want to unlink the file first. | |
617 | ||
618 | However, gcc 2.95 will create temporary files using | |
619 | O_EXCL and tight permissions to prevent other users from | |
620 | substituting other .o files during the compilation. gcc | |
621 | will then tell the assembler to use the newly created | |
622 | file as an output file. If we unlink the file here, we | |
623 | open a brief window when another user could still | |
624 | substitute a file. | |
625 | ||
626 | So we unlink the output file if and only if it has | |
627 | non-zero size. */ | |
5af11cab AM |
628 | #ifndef __MSDOS__ |
629 | /* Don't do this for MSDOS: it doesn't care about overwriting | |
630 | a running binary, but if this file is already open by | |
631 | another BFD, we will be in deep trouble if we delete an | |
632 | open file. In fact, objdump does just that if invoked with | |
633 | the --info option. */ | |
9e422a2e ILT |
634 | struct stat s; |
635 | ||
765cf5f6 AM |
636 | if (stat (bfd_get_filename (abfd), &s) == 0 && s.st_size != 0) |
637 | unlink_if_ordinary (bfd_get_filename (abfd)); | |
5af11cab | 638 | #endif |
765cf5f6 AM |
639 | abfd->iostream = _bfd_real_fopen (bfd_get_filename (abfd), |
640 | FOPEN_WUB); | |
0a1b45a2 | 641 | abfd->opened_once = true; |
252b5132 RH |
642 | } |
643 | break; | |
644 | } | |
645 | ||
5c91cdfb AM |
646 | if (abfd->iostream == NULL) |
647 | bfd_set_error (bfd_error_system_call); | |
648 | else | |
252b5132 RH |
649 | { |
650 | if (! bfd_cache_init (abfd)) | |
651 | return NULL; | |
652 | } | |
653 | ||
654 | return (FILE *) abfd->iostream; | |
655 | } |