mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/*-
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Chris Torek.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)fflush.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "namespace.h"
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include "un-namespace.h"
|
|
#include "libc_private.h"
|
|
#include "local.h"
|
|
|
|
static int sflush_locked(FILE *);
|
|
|
|
/*
|
|
* Flush a single file, or (if fp is NULL) all files.
|
|
* MT-safe version
|
|
*/
|
|
int
|
|
fflush(FILE *fp)
|
|
{
|
|
int retval;
|
|
|
|
if (fp == NULL)
|
|
return (_fwalk(sflush_locked));
|
|
FLOCKFILE(fp);
|
|
|
|
/*
|
|
* There is disagreement about the correct behaviour of fflush()
|
|
* when passed a file which is not open for reading. According to
|
|
* the ISO C standard, the behaviour is undefined.
|
|
* Under linux, such an fflush returns success and has no effect;
|
|
* under Windows, such an fflush is documented as behaving instead
|
|
* as fpurge().
|
|
* Given that applications may be written with the expectation of
|
|
* either of these two behaviours, the only safe (non-astonishing)
|
|
* option is to return EBADF and ask that applications be fixed.
|
|
*/
|
|
if ((fp->_flags & (__SWR | __SRW)) == 0) {
|
|
errno = EBADF;
|
|
retval = EOF;
|
|
} else
|
|
retval = __sflush(fp);
|
|
FUNLOCKFILE(fp);
|
|
return (retval);
|
|
}
|
|
|
|
/*
|
|
* Flush a single file, or (if fp is NULL) all files.
|
|
* Non-MT-safe version
|
|
*/
|
|
int
|
|
__fflush(FILE *fp)
|
|
{
|
|
int retval;
|
|
|
|
if (fp == NULL)
|
|
return (_fwalk(sflush_locked));
|
|
if ((fp->_flags & (__SWR | __SRW)) == 0) {
|
|
errno = EBADF;
|
|
retval = EOF;
|
|
} else
|
|
retval = __sflush(fp);
|
|
return (retval);
|
|
}
|
|
|
|
int
|
|
__sflush(FILE *fp)
|
|
{
|
|
unsigned char *p;
|
|
int n, t;
|
|
|
|
t = fp->_flags;
|
|
if ((t & __SWR) == 0)
|
|
return (0);
|
|
|
|
if ((p = fp->_bf._base) == NULL)
|
|
return (0);
|
|
|
|
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;
|
|
|
|
for (; n > 0; n -= t, p += t) {
|
|
t = _swrite(fp, (char *)p, n);
|
|
if (t <= 0) {
|
|
fp->_flags |= __SERR;
|
|
return (EOF);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
sflush_locked(FILE *fp)
|
|
{
|
|
int ret;
|
|
|
|
FLOCKFILE(fp);
|
|
ret = __sflush(fp);
|
|
FUNLOCKFILE(fp);
|
|
return (ret);
|
|
}
|