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1d611fefbe
are detected. - Modified function return values of 0 and -1 to use macros like OK, ERROR/SEEK_ERROR instead, to better convey what the purpose of these values is. git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14922 87f5fb63-7c3d-0410-a384-fd976d0f7a62
146 lines
4.0 KiB
C
146 lines
4.0 KiB
C
/*
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* $Id: stdio_fflush.c,v 1.8 2005-04-24 08:46:37 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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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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*
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* - 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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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDLIB_NULL_POINTER_CHECK_H
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#include "stdlib_null_pointer_check.h"
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#endif /* _STDLIB_NULL_POINTER_CHECK_H */
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/****************************************************************************/
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#ifndef _STDIO_HEADERS_H
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#include "stdio_headers.h"
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#endif /* _STDIO_HEADERS_H */
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/****************************************************************************/
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int
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fflush(FILE *stream)
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{
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int result = EOF;
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ENTER();
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SHOWPOINTER(stream);
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if(__check_abort_enabled)
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__check_abort();
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/* Subtlety alert: the thread-safe library needs to obtain locks for
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stdio, buffered files and file descriptors in a very particular
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order in order to steer clear of deadlocks. The order is as given
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above: stdio, buffered files, file descriptor table entries. Which
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normally means that if code has any business locking stdio or the
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file descriptor table entries, it should lock stdio first. This
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function, at least in the UNIX_PATH_SEMANTICS variant, does not do
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this. Here's why: if the 'stream' variable is NULL to start with,
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no per-stream locking is performed anyway, and the stdio lock can
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be obtained without running the risk of having obtain semaphores
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in the wrong order. */
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flockfile(stream);
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#if defined(UNIX_PATH_SEMANTICS)
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{
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/* Flush a particular stream? */
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if(stream != NULL)
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{
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struct iob * file = (struct iob *)stream;
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assert( __is_valid_iob(file) );
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if(__iob_write_buffer_is_valid(file) && __flush_iob_write_buffer(file) < 0)
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goto out;
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}
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else
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{
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int failed_iob = -1;
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int i;
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__stdio_lock();
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/* Flush all streams which still have unwritten data in the buffer. */
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for(i = 0 ; i < __num_iob ; i++)
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{
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if(__iob[i] != NULL &&
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FLAG_IS_SET(__iob[i]->iob_Flags,IOBF_IN_USE) &&
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FLAG_IS_SET(__iob[i]->iob_Flags,IOBF_WRITE) &&
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__iob_write_buffer_is_valid(__iob[i]))
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{
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if(__flush_iob_write_buffer(__iob[i]) < 0)
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{
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failed_iob = i;
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break;
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}
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}
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}
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__stdio_unlock();
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if(failed_iob >= 0)
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goto out;
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}
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}
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#else
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{
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struct iob * file = (struct iob *)stream;
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assert( stream != NULL );
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#if defined(CHECK_FOR_NULL_POINTERS)
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{
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if(stream == NULL)
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{
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SHOWMSG("invalid file handle");
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__set_errno(EFAULT);
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goto out;
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}
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}
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#endif /* CHECK_FOR_NULL_POINTERS */
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assert( __is_valid_iob(file) );
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if(__iob_write_buffer_is_valid(file) && __flush_iob_write_buffer(file) < 0)
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goto out;
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}
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#endif /* UNIX_PATH_SEMANTICS */
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result = OK;
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out:
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funlockfile(stream);
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RETURN(result);
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return(result);
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}
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