1 /* Copyright (C) 1993-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Written by Per Bothner <bothner@cygnus.com>.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>.
19 As a special exception, if you link the code in this file with
20 files compiled with a GNU compiler to produce an executable,
21 that does not cause the resulting executable to be covered by
22 the GNU Lesser General Public License. This exception does not
23 however invalidate any other reasons why the executable file
24 might be covered by the GNU Lesser General Public License.
25 This exception applies to code released by its copyright holders
26 in files containing the exception. */
30 # define _POSIX_SOURCE
35 #include <sys/param.h>
36 #include <sys/types.h>
43 # include "../wcsmbs/wcsmbsload.h"
44 # include "../iconv/gconv_charset.h"
45 # include "../iconv/gconv_int.h"
46 # include <shlib-compat.h>
47 # include <not-cancel.h>
48 # include <kernel-features.h>
54 # define __set_errno(Val) errno = (Val)
59 # define open(Name, Flags, Prot) __open (Name, Flags, Prot)
60 # define lseek(FD, Offset, Whence) __lseek (FD, Offset, Whence)
61 # define read(FD, Buf, NBytes) __read (FD, Buf, NBytes)
62 # define write(FD, Buf, NBytes) __write (FD, Buf, NBytes)
64 # define _IO_new_do_write _IO_do_write
65 # define _IO_new_file_attach _IO_file_attach
66 # define _IO_new_file_close_it _IO_file_close_it
67 # define _IO_new_file_finish _IO_file_finish
68 # define _IO_new_file_fopen _IO_file_fopen
69 # define _IO_new_file_init _IO_file_init
70 # define _IO_new_file_setbuf _IO_file_setbuf
71 # define _IO_new_file_sync _IO_file_sync
72 # define _IO_new_file_overflow _IO_file_overflow
73 # define _IO_new_file_seekoff _IO_file_seekoff
74 # define _IO_new_file_underflow _IO_file_underflow
75 # define _IO_new_file_write _IO_file_write
76 # define _IO_new_file_xsputn _IO_file_xsputn
81 extern struct __gconv_trans_data __libio_translit attribute_hidden
;
85 /* An fstream can be in at most one of put mode, get mode, or putback mode.
86 Putback mode is a variant of get mode.
88 In a filebuf, there is only one current position, instead of two
89 separate get and put pointers. In get mode, the current position
90 is that of gptr(); in put mode that of pptr().
92 The position in the buffer that corresponds to the position
93 in external file system is normally _IO_read_end, except in putback
94 mode, when it is _IO_save_end and also when the file is in append mode,
95 since switching from read to write mode automatically sends the position in
96 the external file system to the end of file.
97 If the field _fb._offset is >= 0, it gives the offset in
98 the file as a whole corresponding to eGptr(). (?)
101 If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end,
102 and _IO_read_base are equal to each other. These are usually equal
103 to _IO_buf_base, though not necessarily if we have switched from
104 get mode to put mode. (The reason is to maintain the invariant
105 that _IO_read_end corresponds to the external file position.)
106 _IO_write_base is non-NULL and usually equal to _IO_buf_base.
107 We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode.
108 The un-flushed character are those between _IO_write_base and _IO_write_ptr.
111 If a filebuf is in get or putback mode, eback() != egptr().
112 In get mode, the unread characters are between gptr() and egptr().
113 The OS file position corresponds to that of egptr().
116 Putback mode is used to remember "excess" characters that have
117 been sputbackc'd in a separate putback buffer.
118 In putback mode, the get buffer points to the special putback buffer.
119 The unread characters are the characters between gptr() and egptr()
120 in the putback buffer, as well as the area between save_gptr()
121 and save_egptr(), which point into the original reserve buffer.
122 (The pointers save_gptr() and save_egptr() are the values
123 of gptr() and egptr() at the time putback mode was entered.)
124 The OS position corresponds to that of save_egptr().
126 LINE BUFFERED OUTPUT:
127 During line buffered output, _IO_write_base==base() && epptr()==base().
128 However, ptr() may be anywhere between base() and ebuf().
129 This forces a call to filebuf::overflow(int C) on every put.
130 If there is more space in the buffer, and C is not a '\n',
131 then C is inserted, and pptr() incremented.
134 If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer.
137 #define CLOSED_FILEBUF_FLAGS \
138 (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET)
142 _IO_new_file_init (fp
)
143 struct _IO_FILE_plus
*fp
;
145 /* POSIX.1 allows another file handle to be used to change the position
146 of our file descriptor. Hence we actually don't know the actual
147 position before we do the first fseek (and until a following fflush). */
148 fp
->file
._offset
= _IO_pos_BAD
;
149 fp
->file
._IO_file_flags
|= CLOSED_FILEBUF_FLAGS
;
152 fp
->file
._fileno
= -1;
154 libc_hidden_ver (_IO_new_file_init
, _IO_file_init
)
157 _IO_new_file_close_it (fp
)
161 if (!_IO_file_is_open (fp
))
164 if ((fp
->_flags
& _IO_NO_WRITES
) == 0
165 && (fp
->_flags
& _IO_CURRENTLY_PUTTING
) != 0)
166 write_status
= _IO_do_flush (fp
);
170 _IO_unsave_markers (fp
);
172 int close_status
= ((fp
->_flags2
& _IO_FLAGS2_NOCLOSE
) == 0
173 ? _IO_SYSCLOSE (fp
) : 0);
176 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
179 if (_IO_have_wbackup (fp
))
180 _IO_free_wbackup_area (fp
);
181 _IO_wsetb (fp
, NULL
, NULL
, 0);
182 _IO_wsetg (fp
, NULL
, NULL
, NULL
);
183 _IO_wsetp (fp
, NULL
, NULL
);
186 _IO_setb (fp
, NULL
, NULL
, 0);
187 _IO_setg (fp
, NULL
, NULL
, NULL
);
188 _IO_setp (fp
, NULL
, NULL
);
190 _IO_un_link ((struct _IO_FILE_plus
*) fp
);
191 fp
->_flags
= _IO_MAGIC
|CLOSED_FILEBUF_FLAGS
;
193 fp
->_offset
= _IO_pos_BAD
;
195 return close_status
? close_status
: write_status
;
197 libc_hidden_ver (_IO_new_file_close_it
, _IO_file_close_it
)
200 _IO_new_file_finish (fp
, dummy
)
204 if (_IO_file_is_open (fp
))
207 if (!(fp
->_flags
& _IO_DELETE_DONT_CLOSE
))
210 _IO_default_finish (fp
, 0);
212 libc_hidden_ver (_IO_new_file_finish
, _IO_file_finish
)
215 _IO_file_open (fp
, filename
, posix_mode
, prot
, read_write
, is32not64
)
217 const char *filename
;
225 if (__glibc_unlikely (fp
->_flags2
& _IO_FLAGS2_NOTCANCEL
))
226 fdesc
= open_not_cancel (filename
,
227 posix_mode
| (is32not64
? 0 : O_LARGEFILE
), prot
);
229 fdesc
= open (filename
, posix_mode
| (is32not64
? 0 : O_LARGEFILE
), prot
);
231 fdesc
= open (filename
, posix_mode
, prot
);
236 _IO_mask_flags (fp
, read_write
,_IO_NO_READS
+_IO_NO_WRITES
+_IO_IS_APPENDING
);
237 /* For append mode, send the file offset to the end of the file. Don't
238 update the offset cache though, since the file handle is not active. */
239 if ((read_write
& (_IO_IS_APPENDING
| _IO_NO_READS
))
240 == (_IO_IS_APPENDING
| _IO_NO_READS
))
242 _IO_off64_t new_pos
= _IO_SYSSEEK (fp
, 0, _IO_seek_end
);
243 if (new_pos
== _IO_pos_BAD
&& errno
!= ESPIPE
)
245 close_not_cancel (fdesc
);
249 _IO_link_in ((struct _IO_FILE_plus
*) fp
);
252 libc_hidden_def (_IO_file_open
)
255 _IO_new_file_fopen (fp
, filename
, mode
, is32not64
)
257 const char *filename
;
261 int oflags
= 0, omode
;
268 const char *last_recognized
;
271 if (_IO_file_is_open (fp
))
277 read_write
= _IO_NO_WRITES
;
281 oflags
= O_CREAT
|O_TRUNC
;
282 read_write
= _IO_NO_READS
;
286 oflags
= O_CREAT
|O_APPEND
;
287 read_write
= _IO_NO_READS
|_IO_IS_APPENDING
;
290 __set_errno (EINVAL
);
294 last_recognized
= mode
;
296 for (i
= 1; i
< 7; ++i
)
304 read_write
&= _IO_IS_APPENDING
;
306 last_recognized
= mode
;
312 last_recognized
= mode
;
317 last_recognized
= mode
;
321 fp
->_flags2
|= _IO_FLAGS2_MMAP
;
324 fp
->_flags2
|= _IO_FLAGS2_NOTCANCEL
;
330 fp
->_flags2
|= _IO_FLAGS2_CLOEXEC
;
339 result
= _IO_file_open (fp
, filename
, omode
|oflags
, oprot
, read_write
,
344 #ifndef __ASSUME_O_CLOEXEC
345 if ((fp
->_flags2
& _IO_FLAGS2_CLOEXEC
) != 0 && __have_o_cloexec
<= 0)
347 int fd
= _IO_fileno (fp
);
348 if (__have_o_cloexec
== 0)
350 int flags
= __fcntl (fd
, F_GETFD
);
351 __have_o_cloexec
= (flags
& FD_CLOEXEC
) == 0 ? -1 : 1;
353 if (__have_o_cloexec
< 0)
354 __fcntl (fd
, F_SETFD
, FD_CLOEXEC
);
358 /* Test whether the mode string specifies the conversion. */
359 cs
= strstr (last_recognized
+ 1, ",ccs=");
362 /* Yep. Load the appropriate conversions and set the orientation
364 struct gconv_fcts fcts
;
365 struct _IO_codecvt
*cc
;
366 char *endp
= __strchrnul (cs
+ 5, ',');
367 char ccs
[endp
- (cs
+ 5) + 3];
369 *((char *) __mempcpy (ccs
, cs
+ 5, endp
- (cs
+ 5))) = '\0';
372 if (__wcsmbs_named_conv (&fcts
, ccs
[2] == '\0'
373 ? upstr (ccs
, cs
+ 5) : ccs
) != 0)
375 /* Something went wrong, we cannot load the conversion modules.
376 This means we cannot proceed since the user explicitly asked
378 (void) _IO_file_close_it (fp
);
379 __set_errno (EINVAL
);
383 assert (fcts
.towc_nsteps
== 1);
384 assert (fcts
.tomb_nsteps
== 1);
386 fp
->_wide_data
->_IO_read_ptr
= fp
->_wide_data
->_IO_read_end
;
387 fp
->_wide_data
->_IO_write_ptr
= fp
->_wide_data
->_IO_write_base
;
389 /* Clear the state. We start all over again. */
390 memset (&fp
->_wide_data
->_IO_state
, '\0', sizeof (__mbstate_t
));
391 memset (&fp
->_wide_data
->_IO_last_state
, '\0', sizeof (__mbstate_t
));
393 cc
= fp
->_codecvt
= &fp
->_wide_data
->_codecvt
;
395 /* The functions are always the same. */
396 *cc
= __libio_codecvt
;
398 cc
->__cd_in
.__cd
.__nsteps
= fcts
.towc_nsteps
;
399 cc
->__cd_in
.__cd
.__steps
= fcts
.towc
;
401 cc
->__cd_in
.__cd
.__data
[0].__invocation_counter
= 0;
402 cc
->__cd_in
.__cd
.__data
[0].__internal_use
= 1;
403 cc
->__cd_in
.__cd
.__data
[0].__flags
= __GCONV_IS_LAST
;
404 cc
->__cd_in
.__cd
.__data
[0].__statep
= &result
->_wide_data
->_IO_state
;
406 /* XXX For now no transliteration. */
407 cc
->__cd_in
.__cd
.__data
[0].__trans
= NULL
;
409 cc
->__cd_out
.__cd
.__nsteps
= fcts
.tomb_nsteps
;
410 cc
->__cd_out
.__cd
.__steps
= fcts
.tomb
;
412 cc
->__cd_out
.__cd
.__data
[0].__invocation_counter
= 0;
413 cc
->__cd_out
.__cd
.__data
[0].__internal_use
= 1;
414 cc
->__cd_out
.__cd
.__data
[0].__flags
= __GCONV_IS_LAST
;
415 cc
->__cd_out
.__cd
.__data
[0].__statep
=
416 &result
->_wide_data
->_IO_state
;
418 /* And now the transliteration. */
419 cc
->__cd_out
.__cd
.__data
[0].__trans
= &__libio_translit
;
421 /* From now on use the wide character callback functions. */
422 ((struct _IO_FILE_plus
*) fp
)->vtable
= fp
->_wide_data
->_wide_vtable
;
424 /* Set the mode now. */
431 libc_hidden_ver (_IO_new_file_fopen
, _IO_file_fopen
)
434 _IO_new_file_attach (fp
, fd
)
438 if (_IO_file_is_open (fp
))
441 fp
->_flags
&= ~(_IO_NO_READS
+_IO_NO_WRITES
);
442 fp
->_flags
|= _IO_DELETE_DONT_CLOSE
;
443 /* Get the current position of the file. */
444 /* We have to do that since that may be junk. */
445 fp
->_offset
= _IO_pos_BAD
;
446 int save_errno
= errno
;
447 if (_IO_SEEKOFF (fp
, (_IO_off64_t
)0, _IO_seek_cur
, _IOS_INPUT
|_IOS_OUTPUT
)
448 == _IO_pos_BAD
&& errno
!= ESPIPE
)
450 __set_errno (save_errno
);
453 libc_hidden_ver (_IO_new_file_attach
, _IO_file_attach
)
456 _IO_new_file_setbuf (fp
, p
, len
)
461 if (_IO_default_setbuf (fp
, p
, len
) == NULL
)
464 fp
->_IO_write_base
= fp
->_IO_write_ptr
= fp
->_IO_write_end
466 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
470 libc_hidden_ver (_IO_new_file_setbuf
, _IO_file_setbuf
)
474 _IO_file_setbuf_mmap (fp
, p
, len
)
481 /* Change the function table. */
482 _IO_JUMPS ((struct _IO_FILE_plus
*) fp
) = &_IO_file_jumps
;
483 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps
;
485 /* And perform the normal operation. */
486 result
= _IO_new_file_setbuf (fp
, p
, len
);
488 /* If the call failed, restore to using mmap. */
491 _IO_JUMPS ((struct _IO_FILE_plus
*) fp
) = &_IO_file_jumps_mmap
;
492 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps_mmap
;
498 static _IO_size_t
new_do_write (_IO_FILE
*, const char *, _IO_size_t
);
500 /* Write TO_DO bytes from DATA to FP.
501 Then mark FP as having empty buffers. */
504 _IO_new_do_write (fp
, data
, to_do
)
510 || (_IO_size_t
) new_do_write (fp
, data
, to_do
) == to_do
) ? 0 : EOF
;
512 libc_hidden_ver (_IO_new_do_write
, _IO_do_write
)
516 new_do_write (fp
, data
, to_do
)
522 if (fp
->_flags
& _IO_IS_APPENDING
)
523 /* On a system without a proper O_APPEND implementation,
524 you would need to sys_seek(0, SEEK_END) here, but is
525 not needed nor desirable for Unix- or Posix-like systems.
526 Instead, just indicate that offset (before and after) is
528 fp
->_offset
= _IO_pos_BAD
;
529 else if (fp
->_IO_read_end
!= fp
->_IO_write_base
)
532 = _IO_SYSSEEK (fp
, fp
->_IO_write_base
- fp
->_IO_read_end
, 1);
533 if (new_pos
== _IO_pos_BAD
)
535 fp
->_offset
= new_pos
;
537 count
= _IO_SYSWRITE (fp
, data
, to_do
);
538 if (fp
->_cur_column
&& count
)
539 fp
->_cur_column
= _IO_adjust_column (fp
->_cur_column
- 1, data
, count
) + 1;
540 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
541 fp
->_IO_write_base
= fp
->_IO_write_ptr
= fp
->_IO_buf_base
;
542 fp
->_IO_write_end
= (fp
->_mode
<= 0
543 && (fp
->_flags
& (_IO_LINE_BUF
+_IO_UNBUFFERED
))
544 ? fp
->_IO_buf_base
: fp
->_IO_buf_end
);
549 _IO_new_file_underflow (fp
)
554 /* SysV does not make this test; take it out for compatibility */
555 if (fp
->_flags
& _IO_EOF_SEEN
)
559 if (fp
->_flags
& _IO_NO_READS
)
561 fp
->_flags
|= _IO_ERR_SEEN
;
565 if (fp
->_IO_read_ptr
< fp
->_IO_read_end
)
566 return *(unsigned char *) fp
->_IO_read_ptr
;
568 if (fp
->_IO_buf_base
== NULL
)
570 /* Maybe we already have a push back pointer. */
571 if (fp
->_IO_save_base
!= NULL
)
573 free (fp
->_IO_save_base
);
574 fp
->_flags
&= ~_IO_IN_BACKUP
;
579 /* Flush all line buffered files before reading. */
580 /* FIXME This can/should be moved to genops ?? */
581 if (fp
->_flags
& (_IO_LINE_BUF
|_IO_UNBUFFERED
))
584 _IO_flush_all_linebuffered ();
586 /* We used to flush all line-buffered stream. This really isn't
587 required by any standard. My recollection is that
588 traditional Unix systems did this for stdout. stderr better
589 not be line buffered. So we do just that here
590 explicitly. --drepper */
591 _IO_acquire_lock (_IO_stdout
);
593 if ((_IO_stdout
->_flags
& (_IO_LINKED
| _IO_NO_WRITES
| _IO_LINE_BUF
))
594 == (_IO_LINKED
| _IO_LINE_BUF
))
595 _IO_OVERFLOW (_IO_stdout
, EOF
);
597 _IO_release_lock (_IO_stdout
);
601 _IO_switch_to_get_mode (fp
);
603 /* This is very tricky. We have to adjust those
604 pointers before we call _IO_SYSREAD () since
605 we may longjump () out while waiting for
606 input. Those pointers may be screwed up. H.J. */
607 fp
->_IO_read_base
= fp
->_IO_read_ptr
= fp
->_IO_buf_base
;
608 fp
->_IO_read_end
= fp
->_IO_buf_base
;
609 fp
->_IO_write_base
= fp
->_IO_write_ptr
= fp
->_IO_write_end
612 count
= _IO_SYSREAD (fp
, fp
->_IO_buf_base
,
613 fp
->_IO_buf_end
- fp
->_IO_buf_base
);
617 fp
->_flags
|= _IO_EOF_SEEN
;
619 fp
->_flags
|= _IO_ERR_SEEN
, count
= 0;
621 fp
->_IO_read_end
+= count
;
624 if (fp
->_offset
!= _IO_pos_BAD
)
625 _IO_pos_adjust (fp
->_offset
, count
);
626 return *(unsigned char *) fp
->_IO_read_ptr
;
628 libc_hidden_ver (_IO_new_file_underflow
, _IO_file_underflow
)
630 /* Guts of underflow callback if we mmap the file. This stats the file and
631 updates the stream state to match. In the normal case we return zero.
632 If the file is no longer eligible for mmap, its jump tables are reset to
633 the vanilla ones and we return nonzero. */
635 mmap_remap_check (_IO_FILE
*fp
)
639 if (_IO_SYSSTAT (fp
, &st
) == 0
640 && S_ISREG (st
.st_mode
) && st
.st_size
!= 0
641 /* Limit the file size to 1MB for 32-bit machines. */
642 && (sizeof (ptrdiff_t) > 4 || st
.st_size
< 1*1024*1024))
644 const size_t pagesize
= __getpagesize ();
645 # define ROUNDED(x) (((x) + pagesize - 1) & ~(pagesize - 1))
646 if (ROUNDED (st
.st_size
) < ROUNDED (fp
->_IO_buf_end
649 /* We can trim off some pages past the end of the file. */
650 (void) __munmap (fp
->_IO_buf_base
+ ROUNDED (st
.st_size
),
651 ROUNDED (fp
->_IO_buf_end
- fp
->_IO_buf_base
)
652 - ROUNDED (st
.st_size
));
653 fp
->_IO_buf_end
= fp
->_IO_buf_base
+ st
.st_size
;
655 else if (ROUNDED (st
.st_size
) > ROUNDED (fp
->_IO_buf_end
658 /* The file added some pages. We need to remap it. */
660 #ifdef _G_HAVE_MREMAP
661 p
= __mremap (fp
->_IO_buf_base
, ROUNDED (fp
->_IO_buf_end
663 ROUNDED (st
.st_size
), MREMAP_MAYMOVE
);
666 (void) __munmap (fp
->_IO_buf_base
,
667 fp
->_IO_buf_end
- fp
->_IO_buf_base
);
671 (void) __munmap (fp
->_IO_buf_base
,
672 fp
->_IO_buf_end
- fp
->_IO_buf_base
);
673 p
= __mmap64 (NULL
, st
.st_size
, PROT_READ
, MAP_SHARED
,
678 fp
->_IO_buf_base
= p
;
679 fp
->_IO_buf_end
= fp
->_IO_buf_base
+ st
.st_size
;
683 /* The number of pages didn't change. */
684 fp
->_IO_buf_end
= fp
->_IO_buf_base
+ st
.st_size
;
688 fp
->_offset
-= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
689 _IO_setg (fp
, fp
->_IO_buf_base
,
690 fp
->_offset
< fp
->_IO_buf_end
- fp
->_IO_buf_base
691 ? fp
->_IO_buf_base
+ fp
->_offset
: fp
->_IO_buf_end
,
694 /* If we are already positioned at or past the end of the file, don't
695 change the current offset. If not, seek past what we have mapped,
696 mimicking the position left by a normal underflow reading into its
699 if (fp
->_offset
< fp
->_IO_buf_end
- fp
->_IO_buf_base
)
701 if (__lseek64 (fp
->_fileno
, fp
->_IO_buf_end
- fp
->_IO_buf_base
,
703 != fp
->_IO_buf_end
- fp
->_IO_buf_base
)
704 fp
->_flags
|= _IO_ERR_SEEN
;
706 fp
->_offset
= fp
->_IO_buf_end
- fp
->_IO_buf_base
;
713 /* Life is no longer good for mmap. Punt it. */
714 (void) __munmap (fp
->_IO_buf_base
,
715 fp
->_IO_buf_end
- fp
->_IO_buf_base
);
717 fp
->_IO_buf_base
= fp
->_IO_buf_end
= NULL
;
718 _IO_setg (fp
, NULL
, NULL
, NULL
);
720 _IO_JUMPS ((struct _IO_FILE_plus
*) fp
) = &_IO_file_jumps
;
722 _IO_JUMPS ((struct _IO_FILE_plus
*) fp
) = &_IO_wfile_jumps
;
723 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps
;
729 /* Special callback replacing the underflow callbacks if we mmap the file. */
731 _IO_file_underflow_mmap (_IO_FILE
*fp
)
733 if (fp
->_IO_read_ptr
< fp
->_IO_read_end
)
734 return *(unsigned char *) fp
->_IO_read_ptr
;
736 if (__glibc_unlikely (mmap_remap_check (fp
)))
737 /* We punted to the regular file functions. */
738 return _IO_UNDERFLOW (fp
);
740 if (fp
->_IO_read_ptr
< fp
->_IO_read_end
)
741 return *(unsigned char *) fp
->_IO_read_ptr
;
743 fp
->_flags
|= _IO_EOF_SEEN
;
748 decide_maybe_mmap (_IO_FILE
*fp
)
750 /* We use the file in read-only mode. This could mean we can
751 mmap the file and use it without any copying. But not all
752 file descriptors are for mmap-able objects and on 32-bit
753 machines we don't want to map files which are too large since
754 this would require too much virtual memory. */
757 if (_IO_SYSSTAT (fp
, &st
) == 0
758 && S_ISREG (st
.st_mode
) && st
.st_size
!= 0
759 /* Limit the file size to 1MB for 32-bit machines. */
760 && (sizeof (ptrdiff_t) > 4 || st
.st_size
< 1*1024*1024)
762 && (fp
->_offset
== _IO_pos_BAD
|| fp
->_offset
<= st
.st_size
))
764 /* Try to map the file. */
767 p
= __mmap64 (NULL
, st
.st_size
, PROT_READ
, MAP_SHARED
, fp
->_fileno
, 0);
770 /* OK, we managed to map the file. Set the buffer up and use a
771 special jump table with simplified underflow functions which
772 never tries to read anything from the file. */
774 if (__lseek64 (fp
->_fileno
, st
.st_size
, SEEK_SET
) != st
.st_size
)
776 (void) __munmap (p
, st
.st_size
);
777 fp
->_offset
= _IO_pos_BAD
;
781 _IO_setb (fp
, p
, (char *) p
+ st
.st_size
, 0);
783 if (fp
->_offset
== _IO_pos_BAD
)
786 _IO_setg (fp
, p
, p
+ fp
->_offset
, p
+ st
.st_size
);
787 fp
->_offset
= st
.st_size
;
790 _IO_JUMPS ((struct _IO_FILE_plus
*)fp
) = &_IO_file_jumps_mmap
;
792 _IO_JUMPS ((struct _IO_FILE_plus
*)fp
) = &_IO_wfile_jumps_mmap
;
793 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps_mmap
;
800 /* We couldn't use mmap, so revert to the vanilla file operations. */
803 _IO_JUMPS ((struct _IO_FILE_plus
*) fp
) = &_IO_file_jumps
;
805 _IO_JUMPS ((struct _IO_FILE_plus
*) fp
) = &_IO_wfile_jumps
;
806 fp
->_wide_data
->_wide_vtable
= &_IO_wfile_jumps
;
810 _IO_file_underflow_maybe_mmap (_IO_FILE
*fp
)
812 /* This is the first read attempt. Choose mmap or vanilla operations
813 and then punt to the chosen underflow routine. */
814 decide_maybe_mmap (fp
);
815 return _IO_UNDERFLOW (fp
);
820 _IO_new_file_overflow (f
, ch
)
824 if (f
->_flags
& _IO_NO_WRITES
) /* SET ERROR */
826 f
->_flags
|= _IO_ERR_SEEN
;
830 /* If currently reading or no buffer allocated. */
831 if ((f
->_flags
& _IO_CURRENTLY_PUTTING
) == 0 || f
->_IO_write_base
== NULL
)
833 /* Allocate a buffer if needed. */
834 if (f
->_IO_write_base
== NULL
)
837 _IO_setg (f
, f
->_IO_buf_base
, f
->_IO_buf_base
, f
->_IO_buf_base
);
839 /* Otherwise must be currently reading.
840 If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end,
841 logically slide the buffer forwards one block (by setting the
842 read pointers to all point at the beginning of the block). This
843 makes room for subsequent output.
844 Otherwise, set the read pointers to _IO_read_end (leaving that
845 alone, so it can continue to correspond to the external position). */
846 if (__glibc_unlikely (_IO_in_backup (f
)))
848 size_t nbackup
= f
->_IO_read_end
- f
->_IO_read_ptr
;
849 _IO_free_backup_area (f
);
850 f
->_IO_read_base
-= MIN (nbackup
,
851 f
->_IO_read_base
- f
->_IO_buf_base
);
852 f
->_IO_read_ptr
= f
->_IO_read_base
;
855 if (f
->_IO_read_ptr
== f
->_IO_buf_end
)
856 f
->_IO_read_end
= f
->_IO_read_ptr
= f
->_IO_buf_base
;
857 f
->_IO_write_ptr
= f
->_IO_read_ptr
;
858 f
->_IO_write_base
= f
->_IO_write_ptr
;
859 f
->_IO_write_end
= f
->_IO_buf_end
;
860 f
->_IO_read_base
= f
->_IO_read_ptr
= f
->_IO_read_end
;
862 f
->_flags
|= _IO_CURRENTLY_PUTTING
;
863 if (f
->_mode
<= 0 && f
->_flags
& (_IO_LINE_BUF
+_IO_UNBUFFERED
))
864 f
->_IO_write_end
= f
->_IO_write_ptr
;
867 return _IO_do_write (f
, f
->_IO_write_base
,
868 f
->_IO_write_ptr
- f
->_IO_write_base
);
869 if (f
->_IO_write_ptr
== f
->_IO_buf_end
) /* Buffer is really full */
870 if (_IO_do_flush (f
) == EOF
)
872 *f
->_IO_write_ptr
++ = ch
;
873 if ((f
->_flags
& _IO_UNBUFFERED
)
874 || ((f
->_flags
& _IO_LINE_BUF
) && ch
== '\n'))
875 if (_IO_do_write (f
, f
->_IO_write_base
,
876 f
->_IO_write_ptr
- f
->_IO_write_base
) == EOF
)
878 return (unsigned char) ch
;
880 libc_hidden_ver (_IO_new_file_overflow
, _IO_file_overflow
)
883 _IO_new_file_sync (fp
)
889 /* char* ptr = cur_ptr(); */
890 if (fp
->_IO_write_ptr
> fp
->_IO_write_base
)
891 if (_IO_do_flush(fp
)) return EOF
;
892 delta
= fp
->_IO_read_ptr
- fp
->_IO_read_end
;
896 if (_IO_in_backup (fp
))
897 delta
-= eGptr () - Gbase ();
899 _IO_off64_t new_pos
= _IO_SYSSEEK (fp
, delta
, 1);
900 if (new_pos
!= (_IO_off64_t
) EOF
)
901 fp
->_IO_read_end
= fp
->_IO_read_ptr
;
903 else if (errno
== ESPIPE
)
904 ; /* Ignore error from unseekable devices. */
910 fp
->_offset
= _IO_pos_BAD
;
911 /* FIXME: Cleanup - can this be shared? */
912 /* setg(base(), ptr, ptr); */
915 libc_hidden_ver (_IO_new_file_sync
, _IO_file_sync
)
918 _IO_file_sync_mmap (_IO_FILE
*fp
)
920 if (fp
->_IO_read_ptr
!= fp
->_IO_read_end
)
923 if (_IO_in_backup (fp
))
924 delta
-= eGptr () - Gbase ();
926 if (__lseek64 (fp
->_fileno
, fp
->_IO_read_ptr
- fp
->_IO_buf_base
,
928 != fp
->_IO_read_ptr
- fp
->_IO_buf_base
)
930 fp
->_flags
|= _IO_ERR_SEEN
;
934 fp
->_offset
= fp
->_IO_read_ptr
- fp
->_IO_buf_base
;
935 fp
->_IO_read_end
= fp
->_IO_read_ptr
= fp
->_IO_read_base
;
939 /* ftell{,o} implementation. The only time we modify the state of the stream
940 is when we have unflushed writes. In that case we seek to the end and
941 record that offset in the stream object. */
943 do_ftell (_IO_FILE
*fp
)
945 _IO_off64_t result
, offset
= 0;
947 /* No point looking at unflushed data if we haven't allocated buffers
949 if (fp
->_IO_buf_base
!= NULL
)
951 bool was_writing
= (fp
->_IO_write_ptr
> fp
->_IO_write_base
952 || _IO_in_put_mode (fp
));
954 bool append_mode
= (fp
->_flags
& _IO_IS_APPENDING
) == _IO_IS_APPENDING
;
956 /* When we have unflushed writes in append mode, seek to the end of the
957 file and record that offset. This is the only time we change the file
958 stream state and it is safe since the file handle is active. */
959 if (was_writing
&& append_mode
)
961 result
= _IO_SYSSEEK (fp
, 0, _IO_seek_end
);
962 if (result
== _IO_pos_BAD
)
965 fp
->_offset
= result
;
968 /* Adjust for unflushed data. */
970 offset
-= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
971 /* We don't trust _IO_read_end to represent the current file offset when
972 writing in append mode because the value would have to be shifted to
973 the end of the file during a flush. Use the write base instead, along
974 with the new offset we got above when we did a seek to the end of the
976 else if (append_mode
)
977 offset
+= fp
->_IO_write_ptr
- fp
->_IO_write_base
;
978 /* For all other modes, _IO_read_end represents the file offset. */
980 offset
+= fp
->_IO_write_ptr
- fp
->_IO_read_end
;
983 if (fp
->_offset
!= _IO_pos_BAD
)
984 result
= fp
->_offset
;
986 result
= _IO_SYSSEEK (fp
, 0, _IO_seek_cur
);
995 __set_errno (EINVAL
);
1003 _IO_new_file_seekoff (fp
, offset
, dir
, mode
)
1010 _IO_off64_t delta
, new_offset
;
1013 /* Short-circuit into a separate function. We don't want to mix any
1014 functionality and we don't want to touch anything inside the FILE
1017 return do_ftell (fp
);
1019 /* POSIX.1 8.2.3.7 says that after a call the fflush() the file
1020 offset of the underlying file must be exact. */
1021 int must_be_exact
= (fp
->_IO_read_base
== fp
->_IO_read_end
1022 && fp
->_IO_write_base
== fp
->_IO_write_ptr
);
1024 bool was_writing
= (fp
->_IO_write_ptr
> fp
->_IO_write_base
1025 || _IO_in_put_mode (fp
));
1027 /* Flush unwritten characters.
1028 (This may do an unneeded write if we seek within the buffer.
1029 But to be able to switch to reading, we would need to set
1030 egptr to pptr. That can't be done in the current design,
1031 which assumes file_ptr() is eGptr. Anyway, since we probably
1032 end up flushing when we close(), it doesn't make much difference.)
1033 FIXME: simulate mem-mapped files. */
1034 if (was_writing
&& _IO_switch_to_get_mode (fp
))
1037 if (fp
->_IO_buf_base
== NULL
)
1039 /* It could be that we already have a pushback buffer. */
1040 if (fp
->_IO_read_base
!= NULL
)
1042 free (fp
->_IO_read_base
);
1043 fp
->_flags
&= ~_IO_IN_BACKUP
;
1045 _IO_doallocbuf (fp
);
1046 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1047 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1053 /* Adjust for read-ahead (bytes is buffer). */
1054 offset
-= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
1056 if (fp
->_offset
== _IO_pos_BAD
)
1058 /* Make offset absolute, assuming current pointer is file_ptr(). */
1059 offset
+= fp
->_offset
;
1062 __set_errno (EINVAL
);
1073 if (_IO_SYSSTAT (fp
, &st
) == 0 && S_ISREG (st
.st_mode
))
1075 offset
+= st
.st_size
;
1082 /* At this point, dir==_IO_seek_set. */
1084 /* If destination is within current buffer, optimize: */
1085 if (fp
->_offset
!= _IO_pos_BAD
&& fp
->_IO_read_base
!= NULL
1086 && !_IO_in_backup (fp
))
1088 _IO_off64_t start_offset
= (fp
->_offset
1089 - (fp
->_IO_read_end
- fp
->_IO_buf_base
));
1090 if (offset
>= start_offset
&& offset
< fp
->_offset
)
1092 _IO_setg (fp
, fp
->_IO_buf_base
,
1093 fp
->_IO_buf_base
+ (offset
- start_offset
),
1095 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1097 _IO_mask_flags (fp
, 0, _IO_EOF_SEEN
);
1102 if (fp
->_flags
& _IO_NO_READS
)
1105 /* Try to seek to a block boundary, to improve kernel page management. */
1106 new_offset
= offset
& ~(fp
->_IO_buf_end
- fp
->_IO_buf_base
- 1);
1107 delta
= offset
- new_offset
;
1108 if (delta
> fp
->_IO_buf_end
- fp
->_IO_buf_base
)
1110 new_offset
= offset
;
1113 result
= _IO_SYSSEEK (fp
, new_offset
, 0);
1120 count
= _IO_SYSREAD (fp
, fp
->_IO_buf_base
,
1122 ? delta
: fp
->_IO_buf_end
- fp
->_IO_buf_base
));
1125 /* We weren't allowed to read, but try to seek the remainder. */
1126 offset
= count
== EOF
? delta
: delta
-count
;
1131 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
+ delta
,
1132 fp
->_IO_buf_base
+ count
);
1133 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1134 fp
->_offset
= result
+ count
;
1135 _IO_mask_flags (fp
, 0, _IO_EOF_SEEN
);
1139 _IO_unsave_markers (fp
);
1140 result
= _IO_SYSSEEK (fp
, offset
, dir
);
1143 _IO_mask_flags (fp
, 0, _IO_EOF_SEEN
);
1144 fp
->_offset
= result
;
1145 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1146 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1151 /* We need to do it since it is possible that the file offset in
1152 the kernel may be changed behind our back. It may happen when
1153 we fopen a file and then do a fork. One process may access the
1154 file and the kernel file offset will be changed. */
1155 if (fp
->_offset
>= 0)
1156 _IO_SYSSEEK (fp
, fp
->_offset
, 0);
1160 libc_hidden_ver (_IO_new_file_seekoff
, _IO_file_seekoff
)
1163 _IO_file_seekoff_mmap (fp
, offset
, dir
, mode
)
1171 /* If we are only interested in the current position, calculate it and
1172 return right now. This calculation does the right thing when we are
1173 using a pushback buffer, but in the usual case has the same value as
1174 (fp->_IO_read_ptr - fp->_IO_buf_base). */
1176 return fp
->_offset
- (fp
->_IO_read_end
- fp
->_IO_read_ptr
);
1181 /* Adjust for read-ahead (bytes is buffer). */
1182 offset
+= fp
->_IO_read_ptr
- fp
->_IO_read_base
;
1187 offset
+= fp
->_IO_buf_end
- fp
->_IO_buf_base
;
1190 /* At this point, dir==_IO_seek_set. */
1194 /* No negative offsets are valid. */
1195 __set_errno (EINVAL
);
1199 result
= _IO_SYSSEEK (fp
, offset
, 0);
1203 if (offset
> fp
->_IO_buf_end
- fp
->_IO_buf_base
)
1204 /* One can fseek arbitrarily past the end of the file
1205 and it is meaningless until one attempts to read.
1206 Leave the buffer pointers in EOF state until underflow. */
1207 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_end
, fp
->_IO_buf_end
);
1209 /* Adjust the read pointers to match the file position,
1210 but so the next read attempt will call underflow. */
1211 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
+ offset
,
1212 fp
->_IO_buf_base
+ offset
);
1214 fp
->_offset
= result
;
1216 _IO_mask_flags (fp
, 0, _IO_EOF_SEEN
);
1222 _IO_file_seekoff_maybe_mmap (_IO_FILE
*fp
, _IO_off64_t offset
, int dir
,
1225 /* We only get here when we haven't tried to read anything yet.
1226 So there is nothing more useful for us to do here than just
1227 the underlying lseek call. */
1229 _IO_off64_t result
= _IO_SYSSEEK (fp
, offset
, dir
);
1233 fp
->_offset
= result
;
1238 _IO_file_read (fp
, buf
, size
)
1243 return (__builtin_expect (fp
->_flags2
& _IO_FLAGS2_NOTCANCEL
, 0)
1244 ? read_not_cancel (fp
->_fileno
, buf
, size
)
1245 : read (fp
->_fileno
, buf
, size
));
1247 libc_hidden_def (_IO_file_read
)
1250 _IO_file_seek (fp
, offset
, dir
)
1255 return __lseek64 (fp
->_fileno
, offset
, dir
);
1257 libc_hidden_def (_IO_file_seek
)
1260 _IO_file_stat (fp
, st
)
1264 return __fxstat64 (_STAT_VER
, fp
->_fileno
, (struct stat64
*) st
);
1266 libc_hidden_def (_IO_file_stat
)
1269 _IO_file_close_mmap (fp
)
1272 /* In addition to closing the file descriptor we have to unmap the file. */
1273 (void) __munmap (fp
->_IO_buf_base
, fp
->_IO_buf_end
- fp
->_IO_buf_base
);
1274 fp
->_IO_buf_base
= fp
->_IO_buf_end
= NULL
;
1275 /* Cancelling close should be avoided if possible since it leaves an
1276 unrecoverable state behind. */
1277 return close_not_cancel (fp
->_fileno
);
1284 /* Cancelling close should be avoided if possible since it leaves an
1285 unrecoverable state behind. */
1286 return close_not_cancel (fp
->_fileno
);
1288 libc_hidden_def (_IO_file_close
)
1291 _IO_new_file_write (f
, data
, n
)
1296 _IO_ssize_t to_do
= n
;
1299 _IO_ssize_t count
= (__builtin_expect (f
->_flags2
1300 & _IO_FLAGS2_NOTCANCEL
, 0)
1301 ? write_not_cancel (f
->_fileno
, data
, to_do
)
1302 : write (f
->_fileno
, data
, to_do
));
1305 f
->_flags
|= _IO_ERR_SEEN
;
1309 data
= (void *) ((char *) data
+ count
);
1312 if (f
->_offset
>= 0)
1318 _IO_new_file_xsputn (f
, data
, n
)
1323 const char *s
= (const char *) data
;
1324 _IO_size_t to_do
= n
;
1326 _IO_size_t count
= 0;
1330 /* This is an optimized implementation.
1331 If the amount to be written straddles a block boundary
1332 (or the filebuf is unbuffered), use sys_write directly. */
1334 /* First figure out how much space is available in the buffer. */
1335 if ((f
->_flags
& _IO_LINE_BUF
) && (f
->_flags
& _IO_CURRENTLY_PUTTING
))
1337 count
= f
->_IO_buf_end
- f
->_IO_write_ptr
;
1341 for (p
= s
+ n
; p
> s
; )
1352 else if (f
->_IO_write_end
> f
->_IO_write_ptr
)
1353 count
= f
->_IO_write_end
- f
->_IO_write_ptr
; /* Space available. */
1355 /* Then fill the buffer. */
1361 f
->_IO_write_ptr
= __mempcpy (f
->_IO_write_ptr
, s
, count
);
1363 memcpy (f
->_IO_write_ptr
, s
, count
);
1364 f
->_IO_write_ptr
+= count
;
1369 if (to_do
+ must_flush
> 0)
1371 _IO_size_t block_size
, do_write
;
1372 /* Next flush the (full) buffer. */
1373 if (_IO_OVERFLOW (f
, EOF
) == EOF
)
1374 /* If nothing else has to be written we must not signal the
1375 caller that everything has been written. */
1376 return to_do
== 0 ? EOF
: n
- to_do
;
1378 /* Try to maintain alignment: write a whole number of blocks. */
1379 block_size
= f
->_IO_buf_end
- f
->_IO_buf_base
;
1380 do_write
= to_do
- (block_size
>= 128 ? to_do
% block_size
: 0);
1384 count
= new_do_write (f
, s
, do_write
);
1386 if (count
< do_write
)
1390 /* Now write out the remainder. Normally, this will fit in the
1391 buffer, but it's somewhat messier for line-buffered files,
1392 so we let _IO_default_xsputn handle the general case. */
1394 to_do
-= _IO_default_xsputn (f
, s
+do_write
, to_do
);
1398 libc_hidden_ver (_IO_new_file_xsputn
, _IO_file_xsputn
)
1401 _IO_file_xsgetn (fp
, data
, n
)
1406 _IO_size_t want
, have
;
1412 if (fp
->_IO_buf_base
== NULL
)
1414 /* Maybe we already have a push back pointer. */
1415 if (fp
->_IO_save_base
!= NULL
)
1417 free (fp
->_IO_save_base
);
1418 fp
->_flags
&= ~_IO_IN_BACKUP
;
1420 _IO_doallocbuf (fp
);
1425 have
= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
1428 memcpy (s
, fp
->_IO_read_ptr
, want
);
1429 fp
->_IO_read_ptr
+= want
;
1437 s
= __mempcpy (s
, fp
->_IO_read_ptr
, have
);
1439 memcpy (s
, fp
->_IO_read_ptr
, have
);
1443 fp
->_IO_read_ptr
+= have
;
1446 /* Check for backup and repeat */
1447 if (_IO_in_backup (fp
))
1449 _IO_switch_to_main_get_area (fp
);
1453 /* If we now want less than a buffer, underflow and repeat
1454 the copy. Otherwise, _IO_SYSREAD directly to
1456 if (fp
->_IO_buf_base
1457 && want
< (size_t) (fp
->_IO_buf_end
- fp
->_IO_buf_base
))
1459 if (__underflow (fp
) == EOF
)
1465 /* These must be set before the sysread as we might longjmp out
1466 waiting for input. */
1467 _IO_setg (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1468 _IO_setp (fp
, fp
->_IO_buf_base
, fp
->_IO_buf_base
);
1470 /* Try to maintain alignment: read a whole number of blocks. */
1472 if (fp
->_IO_buf_base
)
1474 _IO_size_t block_size
= fp
->_IO_buf_end
- fp
->_IO_buf_base
;
1475 if (block_size
>= 128)
1476 count
-= want
% block_size
;
1479 count
= _IO_SYSREAD (fp
, s
, count
);
1483 fp
->_flags
|= _IO_EOF_SEEN
;
1485 fp
->_flags
|= _IO_ERR_SEEN
;
1492 if (fp
->_offset
!= _IO_pos_BAD
)
1493 _IO_pos_adjust (fp
->_offset
, count
);
1499 libc_hidden_def (_IO_file_xsgetn
)
1501 static _IO_size_t
_IO_file_xsgetn_mmap (_IO_FILE
*, void *, _IO_size_t
);
1503 _IO_file_xsgetn_mmap (fp
, data
, n
)
1509 char *read_ptr
= fp
->_IO_read_ptr
;
1510 char *s
= (char *) data
;
1512 have
= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
1516 if (__glibc_unlikely (_IO_in_backup (fp
)))
1519 s
= __mempcpy (s
, read_ptr
, have
);
1521 memcpy (s
, read_ptr
, have
);
1525 _IO_switch_to_main_get_area (fp
);
1526 read_ptr
= fp
->_IO_read_ptr
;
1527 have
= fp
->_IO_read_end
- fp
->_IO_read_ptr
;
1532 /* Check that we are mapping all of the file, in case it grew. */
1533 if (__glibc_unlikely (mmap_remap_check (fp
)))
1534 /* We punted mmap, so complete with the vanilla code. */
1535 return s
- (char *) data
+ _IO_XSGETN (fp
, data
, n
);
1537 read_ptr
= fp
->_IO_read_ptr
;
1538 have
= fp
->_IO_read_end
- read_ptr
;
1543 fp
->_flags
|= _IO_EOF_SEEN
;
1547 have
= MIN (have
, n
);
1549 s
= __mempcpy (s
, read_ptr
, have
);
1551 memcpy (s
, read_ptr
, have
);
1554 fp
->_IO_read_ptr
= read_ptr
+ have
;
1557 return s
- (char *) data
;
1560 static _IO_size_t
_IO_file_xsgetn_maybe_mmap (_IO_FILE
*, void *, _IO_size_t
);
1562 _IO_file_xsgetn_maybe_mmap (fp
, data
, n
)
1567 /* We only get here if this is the first attempt to read something.
1568 Decide which operations to use and then punt to the chosen one. */
1570 decide_maybe_mmap (fp
);
1571 return _IO_XSGETN (fp
, data
, n
);
1575 versioned_symbol (libc
, _IO_new_do_write
, _IO_do_write
, GLIBC_2_1
);
1576 versioned_symbol (libc
, _IO_new_file_attach
, _IO_file_attach
, GLIBC_2_1
);
1577 versioned_symbol (libc
, _IO_new_file_close_it
, _IO_file_close_it
, GLIBC_2_1
);
1578 versioned_symbol (libc
, _IO_new_file_finish
, _IO_file_finish
, GLIBC_2_1
);
1579 versioned_symbol (libc
, _IO_new_file_fopen
, _IO_file_fopen
, GLIBC_2_1
);
1580 versioned_symbol (libc
, _IO_new_file_init
, _IO_file_init
, GLIBC_2_1
);
1581 versioned_symbol (libc
, _IO_new_file_setbuf
, _IO_file_setbuf
, GLIBC_2_1
);
1582 versioned_symbol (libc
, _IO_new_file_sync
, _IO_file_sync
, GLIBC_2_1
);
1583 versioned_symbol (libc
, _IO_new_file_overflow
, _IO_file_overflow
, GLIBC_2_1
);
1584 versioned_symbol (libc
, _IO_new_file_seekoff
, _IO_file_seekoff
, GLIBC_2_1
);
1585 versioned_symbol (libc
, _IO_new_file_underflow
, _IO_file_underflow
, GLIBC_2_1
);
1586 versioned_symbol (libc
, _IO_new_file_write
, _IO_file_write
, GLIBC_2_1
);
1587 versioned_symbol (libc
, _IO_new_file_xsputn
, _IO_file_xsputn
, GLIBC_2_1
);
1590 const struct _IO_jump_t _IO_file_jumps
=
1593 JUMP_INIT(finish
, _IO_file_finish
),
1594 JUMP_INIT(overflow
, _IO_file_overflow
),
1595 JUMP_INIT(underflow
, _IO_file_underflow
),
1596 JUMP_INIT(uflow
, _IO_default_uflow
),
1597 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
1598 JUMP_INIT(xsputn
, _IO_file_xsputn
),
1599 JUMP_INIT(xsgetn
, _IO_file_xsgetn
),
1600 JUMP_INIT(seekoff
, _IO_new_file_seekoff
),
1601 JUMP_INIT(seekpos
, _IO_default_seekpos
),
1602 JUMP_INIT(setbuf
, _IO_new_file_setbuf
),
1603 JUMP_INIT(sync
, _IO_new_file_sync
),
1604 JUMP_INIT(doallocate
, _IO_file_doallocate
),
1605 JUMP_INIT(read
, _IO_file_read
),
1606 JUMP_INIT(write
, _IO_new_file_write
),
1607 JUMP_INIT(seek
, _IO_file_seek
),
1608 JUMP_INIT(close
, _IO_file_close
),
1609 JUMP_INIT(stat
, _IO_file_stat
),
1610 JUMP_INIT(showmanyc
, _IO_default_showmanyc
),
1611 JUMP_INIT(imbue
, _IO_default_imbue
)
1613 libc_hidden_data_def (_IO_file_jumps
)
1615 const struct _IO_jump_t _IO_file_jumps_mmap
=
1618 JUMP_INIT(finish
, _IO_file_finish
),
1619 JUMP_INIT(overflow
, _IO_file_overflow
),
1620 JUMP_INIT(underflow
, _IO_file_underflow_mmap
),
1621 JUMP_INIT(uflow
, _IO_default_uflow
),
1622 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
1623 JUMP_INIT(xsputn
, _IO_new_file_xsputn
),
1624 JUMP_INIT(xsgetn
, _IO_file_xsgetn_mmap
),
1625 JUMP_INIT(seekoff
, _IO_file_seekoff_mmap
),
1626 JUMP_INIT(seekpos
, _IO_default_seekpos
),
1627 JUMP_INIT(setbuf
, (_IO_setbuf_t
) _IO_file_setbuf_mmap
),
1628 JUMP_INIT(sync
, _IO_file_sync_mmap
),
1629 JUMP_INIT(doallocate
, _IO_file_doallocate
),
1630 JUMP_INIT(read
, _IO_file_read
),
1631 JUMP_INIT(write
, _IO_new_file_write
),
1632 JUMP_INIT(seek
, _IO_file_seek
),
1633 JUMP_INIT(close
, _IO_file_close_mmap
),
1634 JUMP_INIT(stat
, _IO_file_stat
),
1635 JUMP_INIT(showmanyc
, _IO_default_showmanyc
),
1636 JUMP_INIT(imbue
, _IO_default_imbue
)
1639 const struct _IO_jump_t _IO_file_jumps_maybe_mmap
=
1642 JUMP_INIT(finish
, _IO_file_finish
),
1643 JUMP_INIT(overflow
, _IO_file_overflow
),
1644 JUMP_INIT(underflow
, _IO_file_underflow_maybe_mmap
),
1645 JUMP_INIT(uflow
, _IO_default_uflow
),
1646 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
1647 JUMP_INIT(xsputn
, _IO_new_file_xsputn
),
1648 JUMP_INIT(xsgetn
, _IO_file_xsgetn_maybe_mmap
),
1649 JUMP_INIT(seekoff
, _IO_file_seekoff_maybe_mmap
),
1650 JUMP_INIT(seekpos
, _IO_default_seekpos
),
1651 JUMP_INIT(setbuf
, (_IO_setbuf_t
) _IO_file_setbuf_mmap
),
1652 JUMP_INIT(sync
, _IO_new_file_sync
),
1653 JUMP_INIT(doallocate
, _IO_file_doallocate
),
1654 JUMP_INIT(read
, _IO_file_read
),
1655 JUMP_INIT(write
, _IO_new_file_write
),
1656 JUMP_INIT(seek
, _IO_file_seek
),
1657 JUMP_INIT(close
, _IO_file_close
),
1658 JUMP_INIT(stat
, _IO_file_stat
),
1659 JUMP_INIT(showmanyc
, _IO_default_showmanyc
),
1660 JUMP_INIT(imbue
, _IO_default_imbue
)