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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [bfd/] [bfdio.c] - Blame information for rev 856

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1 227 jeremybenn
/* Low-level I/O routines for BFDs.
2
 
3
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4
   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
5
   Free Software Foundation, Inc.
6
 
7
   Written by Cygnus Support.
8
 
9
   This file is part of BFD, the Binary File Descriptor library.
10
 
11
   This program is free software; you can redistribute it and/or modify
12
   it under the terms of the GNU General Public License as published by
13
   the Free Software Foundation; either version 3 of the License, or
14
   (at your option) any later version.
15
 
16
   This program is distributed in the hope that it will be useful,
17
   but WITHOUT ANY WARRANTY; without even the implied warranty of
18
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19
   GNU General Public License for more details.
20
 
21
   You should have received a copy of the GNU General Public License
22
   along with this program; if not, write to the Free Software
23
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
24
   MA 02110-1301, USA.  */
25
 
26
#include "sysdep.h"
27
#include <limits.h>
28
#include "bfd.h"
29
#include "libbfd.h"
30
 
31
#ifndef S_IXUSR
32
#define S_IXUSR 0100    /* Execute by owner.  */
33
#endif
34
#ifndef S_IXGRP
35
#define S_IXGRP 0010    /* Execute by group.  */
36
#endif
37
#ifndef S_IXOTH
38
#define S_IXOTH 0001    /* Execute by others.  */
39
#endif
40
 
41
#ifndef FD_CLOEXEC
42
#define FD_CLOEXEC 1
43
#endif
44
 
45
file_ptr
46
real_ftell (FILE *file)
47
{
48
#if defined (HAVE_FTELLO64)
49
  return ftello64 (file);
50
#elif defined (HAVE_FTELLO)
51
  return ftello (file);
52
#else
53
  return ftell (file);
54
#endif
55
}
56
 
57
int
58
real_fseek (FILE *file, file_ptr offset, int whence)
59
{
60
#if defined (HAVE_FSEEKO64)
61
  return fseeko64 (file, offset, whence);
62
#elif defined (HAVE_FSEEKO)
63
  return fseeko (file, offset, whence);
64
#else
65
  return fseek (file, offset, whence);
66
#endif
67
}
68
 
69
/* Mark FILE as close-on-exec.  Return FILE.  FILE may be NULL, in
70
   which case nothing is done.  */
71
static FILE *
72
close_on_exec (FILE *file)
73
{
74
#if defined (HAVE_FILENO) && defined (F_GETFD)
75
  if (file)
76
    {
77
      int fd = fileno (file);
78
      int old = fcntl (fd, F_GETFD, 0);
79
      if (old >= 0)
80
        fcntl (fd, F_SETFD, old | FD_CLOEXEC);
81
    }
82
#endif
83
  return file;
84
}
85
 
86
FILE *
87
real_fopen (const char *filename, const char *modes)
88
{
89
#ifdef VMS
90
  char vms_modes[4];
91
  char *vms_attr;
92
 
93
  /* On VMS, fopen allows file attributes as optionnal arguments.
94
     We need to use them but we'd better to use the common prototype.
95
     In fopen-vms.h, they are separated from the mode with a comma.
96
     Split here.  */
97
  vms_attr = strchr (modes, ',');
98
  if (vms_attr == NULL)
99
    {
100
      /* No attributes.  */
101
      return close_on_exec (fopen (filename, modes));
102
    }
103
  else
104
    {
105
      /* Attributes found.  Split.  */
106
      size_t modes_len = strlen (modes) + 1;
107
      char attrs[modes_len + 1];
108
      char *at[3];
109
      int i;
110
 
111
      memcpy (attrs, modes, modes_len);
112
      at[0] = attrs;
113
      for (i = 0; i < 2; i++)
114
        {
115
          at[i + 1] = strchr (at[i], ',');
116
          BFD_ASSERT (at[i + 1] != NULL);
117
          *(at[i + 1]++) = 0; /* Replace ',' with a nul, and skip it.  */
118
        }
119
      return close_on_exec (fopen (filename, at[0], at[1], at[2]));
120
    }
121
#else /* !VMS */
122
#if defined (HAVE_FOPEN64)
123
  return close_on_exec (fopen64 (filename, modes));
124
#else
125
  return close_on_exec (fopen (filename, modes));
126
#endif
127
#endif /* !VMS */
128
}
129
 
130
/*
131
INTERNAL_DEFINITION
132
        struct bfd_iovec
133
 
134
DESCRIPTION
135
 
136
        The <<struct bfd_iovec>> contains the internal file I/O class.
137
        Each <<BFD>> has an instance of this class and all file I/O is
138
        routed through it (it is assumed that the instance implements
139
        all methods listed below).
140
 
141
.struct bfd_iovec
142
.{
143
.  {* To avoid problems with macros, a "b" rather than "f"
144
.     prefix is prepended to each method name.  *}
145
.  {* Attempt to read/write NBYTES on ABFD's IOSTREAM storing/fetching
146
.     bytes starting at PTR.  Return the number of bytes actually
147
.     transfered (a read past end-of-file returns less than NBYTES),
148
.     or -1 (setting <<bfd_error>>) if an error occurs.  *}
149
.  file_ptr (*bread) (struct bfd *abfd, void *ptr, file_ptr nbytes);
150
.  file_ptr (*bwrite) (struct bfd *abfd, const void *ptr,
151
.                      file_ptr nbytes);
152
.  {* Return the current IOSTREAM file offset, or -1 (setting <<bfd_error>>
153
.     if an error occurs.  *}
154
.  file_ptr (*btell) (struct bfd *abfd);
155
.  {* For the following, on successful completion a value of 0 is returned.
156
.     Otherwise, a value of -1 is returned (and  <<bfd_error>> is set).  *}
157
.  int (*bseek) (struct bfd *abfd, file_ptr offset, int whence);
158
.  int (*bclose) (struct bfd *abfd);
159
.  int (*bflush) (struct bfd *abfd);
160
.  int (*bstat) (struct bfd *abfd, struct stat *sb);
161
.  {* Just like mmap: (void*)-1 on failure, mmapped address on success.  *}
162
.  void *(*bmmap) (struct bfd *abfd, void *addr, bfd_size_type len,
163
.                  int prot, int flags, file_ptr offset);
164
.};
165
 
166
*/
167
 
168
 
169
/* Return value is amount read.  */
170
 
171
bfd_size_type
172
bfd_bread (void *ptr, bfd_size_type size, bfd *abfd)
173
{
174
  size_t nread;
175
 
176
  /* If this is an archive element, don't read past the end of
177
     this element.  */
178
  if (abfd->arelt_data != NULL)
179
    {
180
      size_t maxbytes = ((struct areltdata *) abfd->arelt_data)->parsed_size;
181
      if (size > maxbytes)
182
        size = maxbytes;
183
    }
184
 
185
  if ((abfd->flags & BFD_IN_MEMORY) != 0)
186
    {
187
      struct bfd_in_memory *bim;
188
      bfd_size_type get;
189
 
190
      bim = (struct bfd_in_memory *) abfd->iostream;
191
      get = size;
192
      if (abfd->where + get > bim->size)
193
        {
194
          if (bim->size < (bfd_size_type) abfd->where)
195
            get = 0;
196
          else
197
            get = bim->size - abfd->where;
198
          bfd_set_error (bfd_error_file_truncated);
199
        }
200
      memcpy (ptr, bim->buffer + abfd->where, (size_t) get);
201
      abfd->where += get;
202
      return get;
203
    }
204
 
205
  if (abfd->iovec)
206
    nread = abfd->iovec->bread (abfd, ptr, size);
207
  else
208
    nread = 0;
209
  if (nread != (size_t) -1)
210
    abfd->where += nread;
211
 
212
  return nread;
213
}
214
 
215
bfd_size_type
216
bfd_bwrite (const void *ptr, bfd_size_type size, bfd *abfd)
217
{
218
  size_t nwrote;
219
 
220
  if ((abfd->flags & BFD_IN_MEMORY) != 0)
221
    {
222
      struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream;
223
 
224
      size = (size_t) size;
225
      if (abfd->where + size > bim->size)
226
        {
227
          bfd_size_type newsize, oldsize;
228
 
229
          oldsize = (bim->size + 127) & ~(bfd_size_type) 127;
230
          bim->size = abfd->where + size;
231
          /* Round up to cut down on memory fragmentation */
232
          newsize = (bim->size + 127) & ~(bfd_size_type) 127;
233
          if (newsize > oldsize)
234
            {
235
              bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer,
236
                                                              newsize);
237
              if (bim->buffer == NULL)
238
                {
239
                  bim->size = 0;
240
                  return 0;
241
                }
242
              if (newsize > bim->size)
243
                memset (bim->buffer + bim->size, 0, newsize - bim->size);
244
            }
245
        }
246
      memcpy (bim->buffer + abfd->where, ptr, (size_t) size);
247
      abfd->where += size;
248
      return size;
249
    }
250
 
251
  if (abfd->iovec)
252
    nwrote = abfd->iovec->bwrite (abfd, ptr, size);
253
  else
254
    nwrote = 0;
255
 
256
  if (nwrote != (size_t) -1)
257
    abfd->where += nwrote;
258
  if (nwrote != size)
259
    {
260
#ifdef ENOSPC
261
      errno = ENOSPC;
262
#endif
263
      bfd_set_error (bfd_error_system_call);
264
    }
265
  return nwrote;
266
}
267
 
268
file_ptr
269
bfd_tell (bfd *abfd)
270
{
271
  file_ptr ptr;
272
 
273
  if ((abfd->flags & BFD_IN_MEMORY) != 0)
274
    return abfd->where;
275
 
276
  if (abfd->iovec)
277
    {
278
      ptr = abfd->iovec->btell (abfd);
279
 
280
      if (abfd->my_archive)
281
        ptr -= abfd->origin;
282
    }
283
  else
284
    ptr = 0;
285
 
286
  abfd->where = ptr;
287
  return ptr;
288
}
289
 
290
int
291
bfd_flush (bfd *abfd)
292
{
293
  if ((abfd->flags & BFD_IN_MEMORY) != 0)
294
    return 0;
295
 
296
  if (abfd->iovec)
297
    return abfd->iovec->bflush (abfd);
298
  return 0;
299
}
300
 
301
/* Returns 0 for success, negative value for failure (in which case
302
   bfd_get_error can retrieve the error code).  */
303
int
304
bfd_stat (bfd *abfd, struct stat *statbuf)
305
{
306
  int result;
307
 
308
  if ((abfd->flags & BFD_IN_MEMORY) != 0)
309
    abort ();
310
 
311
  if (abfd->iovec)
312
    result = abfd->iovec->bstat (abfd, statbuf);
313
  else
314
    result = -1;
315
 
316
  if (result < 0)
317
    bfd_set_error (bfd_error_system_call);
318
  return result;
319
}
320
 
321
/* Returns 0 for success, nonzero for failure (in which case bfd_get_error
322
   can retrieve the error code).  */
323
 
324
int
325
bfd_seek (bfd *abfd, file_ptr position, int direction)
326
{
327
  int result;
328
  file_ptr file_position;
329
  /* For the time being, a BFD may not seek to it's end.  The problem
330
     is that we don't easily have a way to recognize the end of an
331
     element in an archive.  */
332
 
333
  BFD_ASSERT (direction == SEEK_SET || direction == SEEK_CUR);
334
 
335
  if (direction == SEEK_CUR && position == 0)
336
    return 0;
337
 
338
  if ((abfd->flags & BFD_IN_MEMORY) != 0)
339
    {
340
      struct bfd_in_memory *bim;
341
 
342
      bim = (struct bfd_in_memory *) abfd->iostream;
343
 
344
      if (direction == SEEK_SET)
345
        abfd->where = position;
346
      else
347
        abfd->where += position;
348
 
349
      if (abfd->where > bim->size)
350
        {
351
          if (abfd->direction == write_direction
352
              || abfd->direction == both_direction)
353
            {
354
              bfd_size_type newsize, oldsize;
355
 
356
              oldsize = (bim->size + 127) & ~(bfd_size_type) 127;
357
              bim->size = abfd->where;
358
              /* Round up to cut down on memory fragmentation */
359
              newsize = (bim->size + 127) & ~(bfd_size_type) 127;
360
              if (newsize > oldsize)
361
                {
362
                  bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer,
363
                                                                  newsize);
364
                  if (bim->buffer == NULL)
365
                    {
366
                      bim->size = 0;
367
                      return -1;
368
                    }
369
                  memset (bim->buffer + oldsize, 0, newsize - oldsize);
370
                }
371
            }
372
          else
373
            {
374
              abfd->where = bim->size;
375
              bfd_set_error (bfd_error_file_truncated);
376
              return -1;
377
            }
378
        }
379
      return 0;
380
    }
381
 
382
  if (abfd->format != bfd_archive && abfd->my_archive == 0)
383
    {
384
      if (direction == SEEK_SET && (bfd_vma) position == abfd->where)
385
        return 0;
386
    }
387
  else
388
    {
389
      /* We need something smarter to optimize access to archives.
390
         Currently, anything inside an archive is read via the file
391
         handle for the archive.  Which means that a bfd_seek on one
392
         component affects the `current position' in the archive, as
393
         well as in any other component.
394
 
395
         It might be sufficient to put a spike through the cache
396
         abstraction, and look to the archive for the file position,
397
         but I think we should try for something cleaner.
398
 
399
         In the meantime, no optimization for archives.  */
400
    }
401
 
402
  file_position = position;
403
  if (direction == SEEK_SET && abfd->my_archive != NULL)
404
    file_position += abfd->origin;
405
 
406
  if (abfd->iovec)
407
    result = abfd->iovec->bseek (abfd, file_position, direction);
408
  else
409
    result = -1;
410
 
411
  if (result != 0)
412
    {
413
      int hold_errno = errno;
414
 
415
      /* Force redetermination of `where' field.  */
416
      bfd_tell (abfd);
417
 
418
      /* An EINVAL error probably means that the file offset was
419
         absurd.  */
420
      if (hold_errno == EINVAL)
421
        bfd_set_error (bfd_error_file_truncated);
422
      else
423
        {
424
          bfd_set_error (bfd_error_system_call);
425
          errno = hold_errno;
426
        }
427
    }
428
  else
429
    {
430
      /* Adjust `where' field.  */
431
      if (direction == SEEK_SET)
432
        abfd->where = position;
433
      else
434
        abfd->where += position;
435
    }
436
  return result;
437
}
438
 
439
/*
440
FUNCTION
441
        bfd_get_mtime
442
 
443
SYNOPSIS
444
        long bfd_get_mtime (bfd *abfd);
445
 
446
DESCRIPTION
447
        Return the file modification time (as read from the file system, or
448
        from the archive header for archive members).
449
 
450
*/
451
 
452
long
453
bfd_get_mtime (bfd *abfd)
454
{
455
  struct stat buf;
456
 
457
  if (abfd->mtime_set)
458
    return abfd->mtime;
459
 
460
  if (abfd->iovec == NULL)
461
    return 0;
462
 
463
  if (abfd->iovec->bstat (abfd, &buf) != 0)
464
    return 0;
465
 
466
  abfd->mtime = buf.st_mtime;           /* Save value in case anyone wants it */
467
  return buf.st_mtime;
468
}
469
 
470
/*
471
FUNCTION
472
        bfd_get_size
473
 
474
SYNOPSIS
475
        file_ptr bfd_get_size (bfd *abfd);
476
 
477
DESCRIPTION
478
        Return the file size (as read from file system) for the file
479
        associated with BFD @var{abfd}.
480
 
481
        The initial motivation for, and use of, this routine is not
482
        so we can get the exact size of the object the BFD applies to, since
483
        that might not be generally possible (archive members for example).
484
        It would be ideal if someone could eventually modify
485
        it so that such results were guaranteed.
486
 
487
        Instead, we want to ask questions like "is this NNN byte sized
488
        object I'm about to try read from file offset YYY reasonable?"
489
        As as example of where we might do this, some object formats
490
        use string tables for which the first <<sizeof (long)>> bytes of the
491
        table contain the size of the table itself, including the size bytes.
492
        If an application tries to read what it thinks is one of these
493
        string tables, without some way to validate the size, and for
494
        some reason the size is wrong (byte swapping error, wrong location
495
        for the string table, etc.), the only clue is likely to be a read
496
        error when it tries to read the table, or a "virtual memory
497
        exhausted" error when it tries to allocate 15 bazillon bytes
498
        of space for the 15 bazillon byte table it is about to read.
499
        This function at least allows us to answer the question, "is the
500
        size reasonable?".
501
*/
502
 
503
file_ptr
504
bfd_get_size (bfd *abfd)
505
{
506
  struct stat buf;
507
 
508
  if ((abfd->flags & BFD_IN_MEMORY) != 0)
509
    return ((struct bfd_in_memory *) abfd->iostream)->size;
510
 
511
  if (abfd->iovec == NULL)
512
    return 0;
513
 
514
  if (abfd->iovec->bstat (abfd, &buf) != 0)
515
    return 0;
516
 
517
  return buf.st_size;
518
}
519
 
520
 
521
/*
522
FUNCTION
523
        bfd_mmap
524
 
525
SYNOPSIS
526
        void *bfd_mmap (bfd *abfd, void *addr, bfd_size_type len,
527
                        int prot, int flags, file_ptr offset);
528
 
529
DESCRIPTION
530
        Return mmap()ed region of the file, if possible and implemented.
531
 
532
*/
533
 
534
void *
535
bfd_mmap (bfd *abfd, void *addr, bfd_size_type len,
536
          int prot, int flags, file_ptr offset)
537
{
538
  void *ret = (void *)-1;
539
  if ((abfd->flags & BFD_IN_MEMORY) != 0)
540
    return ret;
541
 
542
  if (abfd->iovec == NULL)
543
    return ret;
544
 
545
  return abfd->iovec->bmmap (abfd, addr, len, prot, flags, offset);
546
}

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