/* -*- indent-tabs-mode:T; c-basic-offset:8; tab-width:8; -*- vi: set ts=8: * $Id: joystick.c,v 2.0 2002/09/22 02:07:31 tramm Exp $ * * (c) Trammell Hudson * * This is a simplistic interface to the Linux joystick devices. * ************* * *  This file is part of the autopilot simulation package. * *  For more details: * *	http://autopilot.sourceforge.net/ * *  Autopilot 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 of the License, or *  (at your option) any later version. * *  Autopilot 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 Autopilot; if not, write to the Free Software *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * */#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <fcntl.h>#include <sys/types.h>#include <sys/time.h>#include <sys/stat.h>#include <sys/ioctl.h>#include "joystick.h"intjoydev_open(	const char *		file_name){	int			fd;	char			value;	fd = open( file_name, O_RDONLY );	if( fd < 0 ) {		perror( file_name );		return -1;	}	/* Find out the number of axes */	if( ioctl( fd, JSIOCGAXES, &value ) == 0 )		fprintf( stderr,			"Joystick has %d axes\n",			value		);	if( ioctl( fd, JSIOCGBUTTONS, &value ) == 0 )		fprintf( stderr,			"Joystick has %d buttons\n",			value		);	return fd;}intjoydev_event(	int			fd,	struct js_event *	e,	int			usecs){	int			rc;	struct timeval		tv;	fd_set			fds;	FD_ZERO( &fds );	FD_SET( fd, &fds );	tv.tv_sec = 0;	tv.tv_usec = usecs;	rc = select(		fd+1,		&fds,		0,		0,		usecs >=0 ? &tv : 0	);	if( rc <= 0 )		return rc;	return read( fd, e, sizeof(*e) );}