2000-02-18 03:39:52 +08:00
|
|
|
/*
|
Implement funopen, fopencookie.
* libc/include/sys/reent.h (struct __sFILE, struct __sFILE64):
Switch to reentrant callbacks.
* libc/include/stdio.h (funopen): Fix declaration.
(fopencookie): Declare.
* libc/stdio/local.h (__sread, __swrite, __sseek, __sclose)
(__sseek64, __swrite64): Fix prototypes.
[__SCLE]: Pull in setmode declaration.
* libc/stdio/stdio.c (__sread, __swrite, __sseek, __sclose): Fix
reentrancy.
* libc/stdio64/stdio64.c (__sseek64_r, __swrite64_r): Delete.
(__sseek64, __swrite64): Fix reentrancy.
* libc/stdio/fseek.c (_fseek_r): Account for overflow, and fix
reentrancy.
* libc/stdio/ftell.c (_ftell_r): Likewise.
* libc/stdio/flags.c (__sflags): Don't lose __SAPP on "a+".
* libc/stdio/fclose.c (_fclose_r): Fix reentrancy.
* libc/stdio/freopen.c (_freopen_r): Likewise.
* libc/stdio/fvwrite.c (__sfvwrite_r): Likewise.
* libc/stdio/refill.c (__srefill_r): Likewise.
* libc/stdio/siscanf.c (eofread): Likewise.
* libc/stdio/sscanf.c (eofread): Likewise.
* libc/stdio/vsiscanf.c (eofread1): Likewise.
* libc/stdio/vsscanf.c (eofread1): Likewise.
* libc/stdio64/freopen64.c (_freopen64_r): Likewise.
* libc/stdio64/fseeko64.c (_fseeko64_r): Likewise.
* libc/stdio64/ftello64.c (_ftello64_r): Likewise.
* libc/stdio/fflush.c (fflush): Improve reentrancy, although more
could be fixed.
* libc/stdio/fopencookie.c (_fopencookie_r, fopencookie): New file.
* libc/stdio/funopen.c (_funopen_r, funopen): New file.
* libc/stdio/Makefile.am (ELIX_4_SOURCES, CHEWOUT_FILES): Build
new files.
* libc/stdio/Makefile.in: Regenerate.
2007-06-05 02:10:17 +08:00
|
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
2000-02-18 03:39:52 +08:00
|
|
|
* All rights reserved.
|
|
|
|
*
|
|
|
|
* Redistribution and use in source and binary forms are permitted
|
|
|
|
* provided that the above copyright notice and this paragraph are
|
|
|
|
* duplicated in all such forms and that any documentation,
|
|
|
|
* advertising materials, and other materials related to such
|
|
|
|
* distribution and use acknowledge that the software was developed
|
|
|
|
* by the University of California, Berkeley. The name of the
|
|
|
|
* University may not be used to endorse or promote products derived
|
|
|
|
* from this software without specific prior written permission.
|
|
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
FUNCTION
|
|
|
|
<<fflush>>---flush buffered file output
|
|
|
|
|
|
|
|
INDEX
|
|
|
|
fflush
|
2008-11-01 05:08:03 +08:00
|
|
|
INDEX
|
|
|
|
_fflush_r
|
2000-02-18 03:39:52 +08:00
|
|
|
|
|
|
|
ANSI_SYNOPSIS
|
|
|
|
#include <stdio.h>
|
|
|
|
int fflush(FILE *<[fp]>);
|
|
|
|
|
2007-07-14 04:37:53 +08:00
|
|
|
int _fflush_r(struct _reent *<[reent]>, FILE *<[fp]>);
|
2000-02-18 03:39:52 +08:00
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
The <<stdio>> output functions can buffer output before delivering it
|
|
|
|
to the host system, in order to minimize the overhead of system calls.
|
|
|
|
|
|
|
|
Use <<fflush>> to deliver any such pending output (for the file
|
|
|
|
or stream identified by <[fp]>) to the host system.
|
|
|
|
|
|
|
|
If <[fp]> is <<NULL>>, <<fflush>> delivers pending output from all
|
|
|
|
open files.
|
|
|
|
|
2007-07-14 04:37:53 +08:00
|
|
|
Additionally, if <[fp]> is a seekable input stream visiting a file
|
|
|
|
descriptor, set the position of the file descriptor to match next
|
|
|
|
unread byte, useful for obeying POSIX semantics when ending a process
|
|
|
|
without consuming all input from the stream.
|
|
|
|
|
|
|
|
The alternate function <<_fflush_r>> is a reentrant version, where the
|
|
|
|
extra argument <[reent]> is a pointer to a reentrancy structure, and
|
|
|
|
<[fp]> must not be NULL.
|
|
|
|
|
2000-02-18 03:39:52 +08:00
|
|
|
RETURNS
|
|
|
|
<<fflush>> returns <<0>> unless it encounters a write error; in that
|
|
|
|
situation, it returns <<EOF>>.
|
|
|
|
|
|
|
|
PORTABILITY
|
2007-07-14 04:37:53 +08:00
|
|
|
ANSI C requires <<fflush>>. The behavior on input streams is only
|
|
|
|
specified by POSIX, and not all implementations follow POSIX rules.
|
2000-02-18 03:39:52 +08:00
|
|
|
|
|
|
|
No supporting OS subroutines are required.
|
|
|
|
*/
|
|
|
|
|
2004-04-23 Artem B. Bityuckiy <abitytsky@softminecorp.com>
* libc/stdio/asprintf.c libc/stdio/clearerr.c,
libc/stdio/fclose.c libc/stdio/fcloseall.c libc/stdio/fdopen.c,
libc/stdio/feof.c libc/stdio/ferror.c libc/stdio/fflush.c,
libc/stdio/fgetc.c libc/stdio/fgetpos.c libc/stdio/fgets.c,
libc/stdio/fileno.c libc/stdio/findfp.c libc/stdio/fiprintf.c,
libc/stdio/flags.c libc/stdio/fopen.c libc/stdio/fprintf.c,
libc/stdio/fputc.c libc/stdio/fputs.c libc/stdio/fread.c,
libc/stdio/freopen.c libc/stdio/fscanf.c libc/stdio/fseek.c,
libc/stdio/fseeko.c libc/stdio/fsetpos.c libc/stdio/ftell.c,
libc/stdio/ftello.c libc/stdio/fvwrite.c libc/stdio/fwalk.c,
libc/stdio/fwrite.c libc/stdio/getc.c libc/stdio/getc_u.c,
libc/stdio/getchar.c libc/stdio/getchar_u.c,
libc/stdio/getdelim.c libc/stdio/getline.c libc/stdio/gets.c,
libc/stdio/getw.c libc/stdio/iprintf.c libc/stdio/local.h,
libc/stdio/makebuf.c libc/stdio/mktemp.c libc/stdio/perror.c,
libc/stdio/printf.c libc/stdio/putc.c libc/stdio/putc_u.c,
libc/stdio/putchar.c libc/stdio/putchar_u.c libc/stdio/puts.c,
libc/stdio/putw.c libc/stdio/refill.c libc/stdio/remove.c,
libc/stdio/rename.c libc/stdio/rewind.c libc/stdio/rget.c,
libc/stdio/scanf.c libc/stdio/setbuf.c libc/stdio/setbuffer.c,
libc/stdio/setlinebuf.c libc/stdio/setvbuf.c,
libc/stdio/siprintf.c libc/stdio/snprintf.c,
libc/stdio/sprintf.c libc/stdio/sscanf.c libc/stdio/stdio.c,
libc/stdio/tmpfile.c libc/stdio/tmpnam.c libc/stdio/ungetc.c,
libc/stdio/vasprintf.c libc/stdio/vfieeefp.h,
libc/stdio/vfprintf.c libc/stdio/vfscanf.c,
libc/stdio/vprintf.c libc/stdio/vscanf.c,
libc/stdio/vsnprintf.c libc/stdio/vsprintf.c,
libc/stdio/vsscanf.c libc/stdio/wbuf.c,
libc/stdio/wsetup.c: Perform minor formatting changes. Move
copyright notices to top of file, ensure that <_ansi.h> is
included, be consistent with open parentheses, use _DEFUN macro,
include "local.h" where needed, and remove various compiler
warnings.
2004-04-24 04:01:55 +08:00
|
|
|
#include <_ansi.h>
|
2000-02-18 03:39:52 +08:00
|
|
|
#include <stdio.h>
|
2007-07-14 04:37:53 +08:00
|
|
|
#include <errno.h>
|
2000-02-18 03:39:52 +08:00
|
|
|
#include "local.h"
|
|
|
|
|
|
|
|
/* Flush a single file, or (if fp is NULL) all files. */
|
|
|
|
|
2011-01-28 18:49:11 +08:00
|
|
|
/* Core function which does not lock file pointer. This gets called
|
|
|
|
directly from __srefill. */
|
2000-02-18 03:39:52 +08:00
|
|
|
int
|
2011-01-28 18:49:11 +08:00
|
|
|
_DEFUN(__sflush_r, (ptr, fp),
|
2007-07-14 04:37:53 +08:00
|
|
|
struct _reent *ptr _AND
|
2004-04-23 Artem B. Bityuckiy <abitytsky@softminecorp.com>
* libc/stdio/asprintf.c libc/stdio/clearerr.c,
libc/stdio/fclose.c libc/stdio/fcloseall.c libc/stdio/fdopen.c,
libc/stdio/feof.c libc/stdio/ferror.c libc/stdio/fflush.c,
libc/stdio/fgetc.c libc/stdio/fgetpos.c libc/stdio/fgets.c,
libc/stdio/fileno.c libc/stdio/findfp.c libc/stdio/fiprintf.c,
libc/stdio/flags.c libc/stdio/fopen.c libc/stdio/fprintf.c,
libc/stdio/fputc.c libc/stdio/fputs.c libc/stdio/fread.c,
libc/stdio/freopen.c libc/stdio/fscanf.c libc/stdio/fseek.c,
libc/stdio/fseeko.c libc/stdio/fsetpos.c libc/stdio/ftell.c,
libc/stdio/ftello.c libc/stdio/fvwrite.c libc/stdio/fwalk.c,
libc/stdio/fwrite.c libc/stdio/getc.c libc/stdio/getc_u.c,
libc/stdio/getchar.c libc/stdio/getchar_u.c,
libc/stdio/getdelim.c libc/stdio/getline.c libc/stdio/gets.c,
libc/stdio/getw.c libc/stdio/iprintf.c libc/stdio/local.h,
libc/stdio/makebuf.c libc/stdio/mktemp.c libc/stdio/perror.c,
libc/stdio/printf.c libc/stdio/putc.c libc/stdio/putc_u.c,
libc/stdio/putchar.c libc/stdio/putchar_u.c libc/stdio/puts.c,
libc/stdio/putw.c libc/stdio/refill.c libc/stdio/remove.c,
libc/stdio/rename.c libc/stdio/rewind.c libc/stdio/rget.c,
libc/stdio/scanf.c libc/stdio/setbuf.c libc/stdio/setbuffer.c,
libc/stdio/setlinebuf.c libc/stdio/setvbuf.c,
libc/stdio/siprintf.c libc/stdio/snprintf.c,
libc/stdio/sprintf.c libc/stdio/sscanf.c libc/stdio/stdio.c,
libc/stdio/tmpfile.c libc/stdio/tmpnam.c libc/stdio/ungetc.c,
libc/stdio/vasprintf.c libc/stdio/vfieeefp.h,
libc/stdio/vfprintf.c libc/stdio/vfscanf.c,
libc/stdio/vprintf.c libc/stdio/vscanf.c,
libc/stdio/vsnprintf.c libc/stdio/vsprintf.c,
libc/stdio/vsscanf.c libc/stdio/wbuf.c,
libc/stdio/wsetup.c: Perform minor formatting changes. Move
copyright notices to top of file, ensure that <_ansi.h> is
included, be consistent with open parentheses, use _DEFUN macro,
include "local.h" where needed, and remove various compiler
warnings.
2004-04-24 04:01:55 +08:00
|
|
|
register FILE * fp)
|
2000-02-18 03:39:52 +08:00
|
|
|
{
|
|
|
|
register unsigned char *p;
|
|
|
|
register int n, t;
|
|
|
|
|
|
|
|
t = fp->_flags;
|
2006-02-21 07:24:00 +08:00
|
|
|
if ((t & __SWR) == 0)
|
2002-05-08 08:12:49 +08:00
|
|
|
{
|
2006-02-21 07:24:00 +08:00
|
|
|
/* For a read stream, an fflush causes the next seek to be
|
|
|
|
unoptimized (i.e. forces a system-level seek). This conforms
|
|
|
|
to the POSIX and SUSv3 standards. */
|
|
|
|
fp->_flags |= __SNPT;
|
2006-12-15 06:47:12 +08:00
|
|
|
|
|
|
|
/* For a seekable stream with buffered read characters, we will attempt
|
|
|
|
a seek to the current position now. A subsequent read will then get
|
|
|
|
the next byte from the file rather than the buffer. This conforms
|
|
|
|
to the POSIX and SUSv3 standards. Note that the standards allow
|
|
|
|
this seek to be deferred until necessary, but we choose to do it here
|
|
|
|
to make the change simpler, more contained, and less likely
|
|
|
|
to miss a code scenario. */
|
2007-07-14 04:37:53 +08:00
|
|
|
if ((fp->_r > 0 || fp->_ur > 0) && fp->_seek != NULL)
|
|
|
|
{
|
2009-10-30 16:26:41 +08:00
|
|
|
int tmp_errno;
|
2007-07-14 04:37:53 +08:00
|
|
|
#ifdef __LARGE64_FILES
|
|
|
|
_fpos64_t curoff;
|
|
|
|
#else
|
|
|
|
_fpos_t curoff;
|
|
|
|
#endif
|
|
|
|
|
2009-10-30 16:26:41 +08:00
|
|
|
/* Save last errno and set errno to 0, so we can check if a device
|
|
|
|
returns with a valid position -1. We restore the last errno if
|
|
|
|
no other error condition has been encountered. */
|
|
|
|
tmp_errno = ptr->_errno;
|
|
|
|
ptr->_errno = 0;
|
2007-07-14 04:37:53 +08:00
|
|
|
/* Get the physical position we are at in the file. */
|
|
|
|
if (fp->_flags & __SOFF)
|
|
|
|
curoff = fp->_offset;
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* We don't know current physical offset, so ask for it.
|
2009-10-30 16:26:41 +08:00
|
|
|
Only ESPIPE and EINVAL are ignorable. */
|
2007-07-14 04:37:53 +08:00
|
|
|
#ifdef __LARGE64_FILES
|
|
|
|
if (fp->_flags & __SL64)
|
|
|
|
curoff = fp->_seek64 (ptr, fp->_cookie, 0, SEEK_CUR);
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
curoff = fp->_seek (ptr, fp->_cookie, 0, SEEK_CUR);
|
2009-10-30 16:26:41 +08:00
|
|
|
if (curoff == -1L && ptr->_errno != 0)
|
2007-07-14 04:37:53 +08:00
|
|
|
{
|
|
|
|
int result = EOF;
|
2009-10-30 16:26:41 +08:00
|
|
|
if (ptr->_errno == ESPIPE || ptr->_errno == EINVAL)
|
|
|
|
{
|
|
|
|
result = 0;
|
|
|
|
ptr->_errno = tmp_errno;
|
|
|
|
}
|
2007-07-14 04:37:53 +08:00
|
|
|
else
|
|
|
|
fp->_flags |= __SERR;
|
|
|
|
return result;
|
|
|
|
}
|
2006-12-15 06:47:12 +08:00
|
|
|
}
|
|
|
|
if (fp->_flags & __SRD)
|
|
|
|
{
|
|
|
|
/* Current offset is at end of buffer. Compensate for
|
|
|
|
characters not yet read. */
|
|
|
|
curoff -= fp->_r;
|
|
|
|
if (HASUB (fp))
|
|
|
|
curoff -= fp->_ur;
|
|
|
|
}
|
2007-07-14 04:37:53 +08:00
|
|
|
/* Now physically seek to after byte last read. */
|
|
|
|
#ifdef __LARGE64_FILES
|
|
|
|
if (fp->_flags & __SL64)
|
2009-10-30 16:26:41 +08:00
|
|
|
curoff = fp->_seek64 (ptr, fp->_cookie, curoff, SEEK_SET);
|
2007-07-14 04:37:53 +08:00
|
|
|
else
|
|
|
|
#endif
|
2009-10-30 16:26:41 +08:00
|
|
|
curoff = fp->_seek (ptr, fp->_cookie, curoff, SEEK_SET);
|
|
|
|
if (curoff != -1 || ptr->_errno == 0
|
|
|
|
|| ptr->_errno == ESPIPE || ptr->_errno == EINVAL)
|
2007-07-14 04:37:53 +08:00
|
|
|
{
|
2009-10-30 16:26:41 +08:00
|
|
|
/* Seek successful or ignorable error condition.
|
|
|
|
We can clear read buffer now. */
|
2007-07-14 04:37:53 +08:00
|
|
|
fp->_flags &= ~__SNPT;
|
|
|
|
fp->_r = 0;
|
|
|
|
fp->_p = fp->_bf._base;
|
2009-10-30 16:26:41 +08:00
|
|
|
if ((fp->_flags & __SOFF) && (curoff != -1 || ptr->_errno == 0))
|
2007-07-14 04:37:53 +08:00
|
|
|
fp->_offset = curoff;
|
2009-10-30 16:26:41 +08:00
|
|
|
ptr->_errno = tmp_errno;
|
2008-03-04 10:22:36 +08:00
|
|
|
if (HASUB (fp))
|
|
|
|
FREEUB (ptr, fp);
|
2007-07-14 04:37:53 +08:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
fp->_flags |= __SERR;
|
|
|
|
return EOF;
|
|
|
|
}
|
|
|
|
}
|
2006-02-21 07:24:00 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if ((p = fp->_bf._base) == NULL)
|
|
|
|
{
|
|
|
|
/* Nothing to flush. */
|
2002-05-08 08:12:49 +08:00
|
|
|
return 0;
|
|
|
|
}
|
2000-02-18 03:39:52 +08:00
|
|
|
n = fp->_p - p; /* write this much */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set these immediately to avoid problems with longjmp
|
|
|
|
* and to allow exchange buffering (via setvbuf) in user
|
|
|
|
* write function.
|
|
|
|
*/
|
|
|
|
fp->_p = p;
|
|
|
|
fp->_w = t & (__SLBF | __SNBF) ? 0 : fp->_bf._size;
|
|
|
|
|
|
|
|
while (n > 0)
|
|
|
|
{
|
2007-07-14 04:37:53 +08:00
|
|
|
t = fp->_write (ptr, fp->_cookie, (char *) p, n);
|
2000-02-18 03:39:52 +08:00
|
|
|
if (t <= 0)
|
|
|
|
{
|
2002-05-08 08:12:49 +08:00
|
|
|
fp->_flags |= __SERR;
|
|
|
|
return EOF;
|
2000-02-18 03:39:52 +08:00
|
|
|
}
|
|
|
|
p += t;
|
|
|
|
n -= t;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2007-07-14 04:37:53 +08:00
|
|
|
|
2011-01-28 18:49:11 +08:00
|
|
|
int
|
|
|
|
_DEFUN(_fflush_r, (ptr, fp),
|
|
|
|
struct _reent *ptr _AND
|
|
|
|
register FILE * fp)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
#ifdef _REENT_SMALL
|
|
|
|
/* For REENT_SMALL platforms, it is possible we are being
|
|
|
|
called for the first time on a std stream. This std
|
|
|
|
stream can belong to a reentrant struct that is not
|
|
|
|
_REENT. If CHECK_INIT gets called below based on _REENT,
|
|
|
|
we will end up changing said file pointers to the equivalent
|
|
|
|
std stream off of _REENT. This causes unexpected behavior if
|
|
|
|
there is any data to flush on the _REENT std stream. There
|
|
|
|
are two alternatives to fix this: 1) make a reentrant fflush
|
|
|
|
or 2) simply recognize that this file has nothing to flush
|
|
|
|
and return immediately before performing a CHECK_INIT. Choice
|
|
|
|
2 is implemented here due to its simplicity. */
|
|
|
|
if (fp->_bf._base == NULL)
|
|
|
|
return 0;
|
|
|
|
#endif /* _REENT_SMALL */
|
|
|
|
|
|
|
|
CHECK_INIT (ptr, fp);
|
|
|
|
|
|
|
|
if (!fp->_flags)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
_flockfile (fp);
|
|
|
|
ret = __sflush_r (ptr, fp);
|
|
|
|
_funlockfile (fp);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2007-07-14 04:37:53 +08:00
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
|
|
|
|
int
|
|
|
|
_DEFUN(fflush, (fp),
|
|
|
|
register FILE * fp)
|
|
|
|
{
|
|
|
|
if (fp == NULL)
|
|
|
|
return _fwalk_reent (_GLOBAL_REENT, _fflush_r);
|
|
|
|
|
|
|
|
return _fflush_r (_REENT, fp);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* _REENT_ONLY */
|