/*
 * $Id: termios_tcdrain.c,v 1.4 2006-11-16 14:39:23 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 */

#ifndef	_TERMIOS_HEADERS_H
#include "termios_headers.h"
#endif /* _TERMIOS_HEADERS_H */

/****************************************************************************/

#if defined(__amigaos4__) && !defined(Flush)
#define Flush(fh) FFlush(fh)
#endif /* __amigaos4__ && !Flush */

/****************************************************************************/

int
tcdrain(int file_descriptor) 
{
	int result = ERROR;
	struct fd *fd;

	ENTER();

	SHOWVALUE(file_descriptor);

	if(__check_abort_enabled)
		__check_abort();

	__stdio_lock();

	fd = __get_file_descriptor(file_descriptor);
	if(fd == NULL)
	{
		__set_errno(EBADF);
		goto out;
	}

	__fd_lock(fd);

	if(FLAG_IS_SET(fd->fd_Flags,FDF_TERMIOS))
	{
		struct termios *tios;
		BPTR file;

		tios = fd->fd_Aux;

		switch(tios->type)
		{
			case TIOST_CONSOLE:

				file = __resolve_fd_file(fd);
				if(file == ZERO)
				{
					__set_errno(EBADF);
					goto out;
				}

				/* This also discards any buffered input, but it does
				   not appear possible to drain the output buffer
				   otherwise. (?) */
				if(CANNOT Flush(file))
					goto out;

				break;

			default: /* TODO: Serial port support. */

				__set_errno(ENXIO);
				goto out;
		}

		result = OK;
	}
	else
	{
		result = fdatasync(file_descriptor); /* If called on a "regular" file. */
	}

 out:

	__fd_unlock(fd);

	__stdio_unlock();

	RETURN(result);
	return(result);
}