166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
/* fflush.c - flush file stdio.h */
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/* Copyright 1992-1995 Wind River Systems, Inc. */
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/*
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modification history
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--------------------
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01g,05feb99,dgp document errno values
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01f,10mar95,ism removed SPR#2548 changes.
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01e,20jan95,ism changed FIOFLUSH to FIOSYNC
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01d,03oct94,ism added FIOFLUSH ioctl to __sflush() as per SPR#2548
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01c,05mar93,jdi documentation cleanup for 5.1.
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01b,20sep92,smb documentation additions
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01a,29jul92,jcf Added OBJ_VERIFY
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smb taken from UCB stdio
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*/
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/*
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DESCRIPTION
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*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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INCLUDE FILE: stdio.h, error.h
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SEE ALSO: American National Standard X3.159-1989
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NOMANUAL
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*/
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#include "vxWorks.h"
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#include "stdio.h"
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#include "errno.h"
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#include "objLib.h"
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#include "private/stdioP.h"
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#include "sys/ioctl.h"
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#include "ioLib.h"
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/******************************************************************************
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*
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* fflush - flush a stream (ANSI)
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*
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* This routine writes to the file any unwritten data for a specified output
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* or update stream for which the most recent operation was not input; for an
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* input stream the behavior is undefined.
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*
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* CAVEAT
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* ANSI specifies that if <fp> is a null pointer, fflush() performs the
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* flushing action on all streams for which the behavior is defined; however,
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* this is not implemented in VxWorks.
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*
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* INCLUDE FILES: stdio.h
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*
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* RETURNS: Zero, or EOF if a write error occurs.
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*
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* ERRNO: EBADF
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*
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* SEE ALSO: fclose()
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*/
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int fflush
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(
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FAST FILE * fp /* stream to flush */
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)
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{
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if (OBJ_VERIFY (fp, fpClassId) != OK)
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return (EOF);
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/* ANSI specifies that fflush (NULL) will flush all task's file pointers.
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* The problem is that we don't keep such a list today so we return EOF
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* for now.
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*/
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if ((fp == NULL) ||
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((fp->_flags & __SWR) == 0))
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{
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errno = EBADF;
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return (EOF);
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}
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return (__sflush(fp));
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}
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/******************************************************************************
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*
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* __sflush - flush stream pointed to by fp.
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*
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* INCLUDE: stdio.h
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*
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* RETURNS: ZERO or EOF
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* NOMANUAL
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*/
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int __sflush
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(
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FAST FILE *fp
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)
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{
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FAST unsigned char *p;
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FAST int n;
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FAST int t;
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if (OBJ_VERIFY (fp, fpClassId) != OK)
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return (EOF);
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t = fp->_flags;
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if ((t & __SWR) == 0)
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return (0);
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if ((p = fp->_bf._base) == NULL)
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return (0);
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n = fp->_p - p; /* write this much */
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/* Set these immediately to avoid problems with longjmp and to allow
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* exchange buffering (via setvbuf) in user write function.
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*/
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fp->_p = p;
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fp->_w = (t & (__SLBF|__SNBF)) ? (0) : (fp->_bf._size);
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for (; n > 0; n -= t, p += t)
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{
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t = __swrite (fp, (char *)p, n);
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if (t <= 0)
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{
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fp->_flags |= __SERR;
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return (EOF);
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}
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}
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return (0);
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}
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