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//========================================================================
//
// fflush.cxx
//
// Implementation of C library file flush function as per ANSI 7.9.5.2
//
//========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors:
// Date: 2000-04-20
// Purpose: Provides ISO C fflush() function
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//========================================================================
// CONFIGURATION
#include <pkgconf/libc_stdio.h> // Configuration header
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common project-wide type definitions
#include <stddef.h> // NULL and size_t from compiler
#include <errno.h> // Error codes
#include <stdio.h> // header for fflush()
#include <cyg/libc/stdio/stream.hxx>// C library streams
#include <cyg/libc/stdio/stdiofiles.hxx> // C library files
#include <cyg/libc/stdio/stdiosupp.hxx> // support for stdio
// FUNCTIONS
// flush all but one stream
externC Cyg_ErrNo
cyg_libc_stdio_flush_all_but( Cyg_StdioStream *not_this_stream )
{
cyg_bool files_flushed[FOPEN_MAX] = { false }; // sets all to 0
cyg_bool loop_again, looped = false;
cyg_ucount32 i;
Cyg_ErrNo err=ENOERR;
Cyg_StdioStream *stream;
do {
loop_again = false;
for (i=0; (i<FOPEN_MAX) && !err; i++) {
if (files_flushed[i] == false) {
// Don't let the files table change e.g. by closing the file.
if ( !Cyg_libc_stdio_files::lock() ) {
err = EINTR;
break;
}
stream = Cyg_libc_stdio_files::get_file_stream(i);
if ((stream == NULL) || (stream == not_this_stream)) {
// if it isn't a valid stream, set its entry in the
// list of files flushed since we don't want to
// flush it
// Ditto if its the one we're meant to miss
files_flushed[i] = true;
} // if
else {
// valid stream
#ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
// only buffers which we've written to need flushing
if ( !stream->flags.last_buffer_op_was_read)
#endif
{
// we try to flush the first time through so that
// everything is flushed that can be flushed.
// The second time through we should just wait
// in case some other lowerpri thread has locked the
// stream, otherwise we will spin needlessly and
// never let the lower pri thread run!
if ( (looped && stream->lock_me()) ||
stream->trylock_me() ) {
err = stream->flush_output_unlocked();
stream->unlock_me();
files_flushed[i] = true;
} // if
else {
loop_again = true;
looped = true;
}
}
} // else
// We can unlock and relock every loop as we only care
// about flushing streams that were open prior to this
// call. Any new streams can be ignored.
Cyg_libc_stdio_files::unlock();
} // if
} // for
} // do
while(loop_again && !err);
return err;
} // cyg_libc_stdio_flush_all_but()
externC int
fflush( FILE *stream ) __THROW
{
Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
Cyg_ErrNo err;
if (stream == NULL) { // tells us to flush ALL streams
err = cyg_libc_stdio_flush_all_but(NULL);
} // if
else {
err = real_stream->flush_output();
} // else
if (err) {
errno = err;
return EOF;
} // if
return 0;
} // fflush()
// EOF fflush.cxx
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