?? joystick.c
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/* -*- 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) );}
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