X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Ffg_io.cxx;h=36ca64433d3f6dc923acdfcdaa59374ea88856d7;hb=f467ba360902e4395d23b35481c55844a3946b91;hp=36a95295c975a1098086e442b1090ff67e266a93;hpb=1fd92702678bcf4a32f888fe3014c684e0235870;p=flightgear.git

diff --git a/src/Main/fg_io.cxx b/src/Main/fg_io.cxx
index 36a95295c..36ca64433 100644
--- a/src/Main/fg_io.cxx
+++ b/src/Main/fg_io.cxx
@@ -2,7 +2,7 @@
 //
 // Written by Curtis Olson, started November 1999.
 //
-// Copyright (C) 1999  Curtis L. Olson - curt@flightgear.org
+// Copyright (C) 1999  Curtis L. Olson - http://www.flightgear.org/~curt
 //
 // This program is free software; you can redistribute it and/or
 // modify it under the terms of the GNU General Public License as
@@ -16,141 +16,283 @@
 //
 // You should have received a copy of the GNU General Public License
 // along with this program; if not, write to the Free Software
-// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 //
 // $Id$
 
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
 
-#include <Include/compiler.h>
-
-// #ifdef FG_HAVE_STD_INCLUDES
-// #  include <cmath>
-// #  include <cstdlib>    // atoi()
-// #else
-// #  include <math.h>
-// #  include <stdlib.h>   // atoi()
-// #endif
+#include <simgear/compiler.h>
 
-#include STL_STRING
-// #include STL_IOSTREAM                                           
-// #include <vector>                                                               
+#include <cstdlib>             // atoi()
 
-#include <Debug/logstream.hxx>
-// #include <Aircraft/aircraft.hxx>
-// #include <Include/fg_constants.h>
-#include <Include/fg_types.hxx>
-#include <Main/options.hxx>
+#include <string>
 
-#include <Network/iochannel.hxx>
-#include <Network/fg_file.hxx>
-#include <Network/fg_serial.hxx>
+#include <simgear/debug/logstream.hxx>
+#include <simgear/io/iochannel.hxx>
+#include <simgear/io/sg_file.hxx>
+#include <simgear/io/sg_serial.hxx>
+#include <simgear/io/sg_socket.hxx>
+#include <simgear/io/sg_socket_udp.hxx>
+#include <simgear/math/sg_types.hxx>
+#include <simgear/timing/timestamp.hxx>
+#include <simgear/misc/strutils.hxx>
 
 #include <Network/protocol.hxx>
+#include <Network/ATC-Main.hxx>
+#include <Network/atlas.hxx>
+#include <Network/AV400.hxx>
+#include <Network/AV400Sim.hxx>
 #include <Network/garmin.hxx>
+#include <Network/httpd.hxx>
+#ifdef FG_JPEG_SERVER
+#  include <Network/jpg-httpd.hxx>
+#endif
+#include <Network/joyclient.hxx>
+#include <Network/jsclient.hxx>
+#include <Network/native.hxx>
+#include <Network/native_ctrls.hxx>
+#include <Network/native_fdm.hxx>
+#include <Network/native_gui.hxx>
+#include <Network/opengc.hxx>
 #include <Network/nmea.hxx>
+#include <Network/props.hxx>
+#include <Network/pve.hxx>
+#include <Network/ray.hxx>
+#include <Network/rul.hxx>
+#include <Network/generic.hxx>
+#include <Network/multiplay.hxx>
 
-// #include <Time/fg_time.hxx>
-#include <Time/timestamp.hxx>
+#include "globals.hxx"
+#include "fg_io.hxx"
 
-FG_USING_STD(string);
+using std::atoi;
+using std::string;
 
 
-// define the global I/O channel list
-io_container global_io_list;
+FGIO::FGIO()
+{
+}
 
+#include <algorithm>
+using std::for_each;
 
-// configure a port based on the config string
-static FGProtocol *parse_port_config( const string& config )
-{
-    string::size_type begin, end;
+static void delete_ptr( FGProtocol* p ) { delete p; }
 
-    begin = 0;
+FGIO::~FGIO()
+{
+    shutdown_all();
+    for_each( io_channels.begin(), io_channels.end(), delete_ptr );
+}
 
-    FG_LOG( FG_IO, FG_INFO, "Parse I/O channel request: " << config );
 
-    // determine protocol
-    end = config.find(",", begin);
-    if ( end == string::npos ) {
-	return NULL;		// dummy
-    }
-    
-    string protocol = config.substr(begin, end - begin);
-    begin = end + 1;
-    FG_LOG( FG_IO, FG_INFO, "  protocol = " << protocol );
-
-    FGProtocol *io;
-    if ( protocol == "nmea" ) {
-	FGNMEA *nmea = new FGNMEA;
-	io = nmea;
-    } else if ( protocol == "garmin" ) {
-	FGGarmin *garmin = new FGGarmin;
-	io = garmin;
-    } else {
-	return NULL;
+// configure a port based on the config string
+FGProtocol*
+FGIO::parse_port_config( const string& config )
+{
+    SG_LOG( SG_IO, SG_INFO, "Parse I/O channel request: " << config );
+
+    vector<string> tokens = simgear::strutils::split( config, "," );
+    if (tokens.empty())
+    {
+	SG_LOG( SG_IO, SG_ALERT,
+		"Port configuration error: empty config string" );
+	return 0;
     }
 
-    // determine medium
-    end = config.find(",", begin);
-    if ( end == string::npos ) {
-	return NULL;		// dummy
+    string protocol = tokens[0];
+    SG_LOG( SG_IO, SG_INFO, "  protocol = " << protocol );
+
+    FGProtocol *io = 0;
+
+    try
+    {
+	if ( protocol == "atcsim" ) {
+            FGATCMain *atcsim = new FGATCMain;
+	    atcsim->set_hz( 30 );
+            if ( tokens.size() != 6 ) {
+                SG_LOG( SG_IO, SG_ALERT, "Usage: --atcsim=[no-]pedals,"
+                        << "input0_config,input1_config,"
+                        << "output0_config,output1_config,file.nas" );
+		delete atcsim;
+                return NULL;
+            }
+            if ( tokens[1] == "no-pedals" ) {
+                fgSetBool( "/input/atcsim/ignore-pedal-controls", true );
+            } else {
+                fgSetBool( "/input/atcsim/ignore-pedal-controls", false );
+            }
+            atcsim->set_path_names(tokens[2], tokens[3], tokens[4], tokens[5]);
+	    return atcsim;
+	} else if ( protocol == "atlas" ) {
+	    FGAtlas *atlas = new FGAtlas;
+	    io = atlas;
+	} else if ( protocol == "opengc" ) {
+	    // char wait;
+	    // printf("Parsed opengc\n"); cin >> wait;
+	    FGOpenGC *opengc = new FGOpenGC;
+	    io = opengc;
+	} else if ( protocol == "AV400" ) {
+	    FGAV400 *av400 = new FGAV400;
+	    io = av400;
+	} else if ( protocol == "AV400Sim" ) {
+	    FGAV400Sim *av400sim = new FGAV400Sim;
+	    io = av400sim;
+	} else if ( protocol == "garmin" ) {
+	    FGGarmin *garmin = new FGGarmin;
+	    io = garmin;
+	} else if ( protocol == "httpd" ) {
+	    // determine port
+	    string port = tokens[1];
+	    return new FGHttpd( atoi(port.c_str()) );
+#ifdef FG_JPEG_SERVER
+	} else if ( protocol == "jpg-httpd" ) {
+	    // determine port
+	    string port = tokens[1];
+	    return new FGJpegHttpd( atoi(port.c_str()) );
+#endif
+	} else if ( protocol == "joyclient" ) {
+	    FGJoyClient *joyclient = new FGJoyClient;
+	    io = joyclient;
+        } else if ( protocol == "jsclient" ) {
+            FGJsClient *jsclient = new FGJsClient;
+            io = jsclient;
+	} else if ( protocol == "native" ) {
+	    FGNative *native = new FGNative;
+	    io = native;
+	} else if ( protocol == "native-ctrls" ) {
+	    FGNativeCtrls *native_ctrls = new FGNativeCtrls;
+	    io = native_ctrls;
+	} else if ( protocol == "native-fdm" ) {
+	    FGNativeFDM *native_fdm = new FGNativeFDM;
+	    io = native_fdm;
+	} else if ( protocol == "native-gui" ) {
+	    FGNativeGUI *net_gui = new FGNativeGUI;
+	    io = net_gui;
+	} else if ( protocol == "nmea" ) {
+	    FGNMEA *nmea = new FGNMEA;
+	    io = nmea;
+	} else if ( protocol == "props" || protocol == "telnet" ) {
+	    io = new FGProps( tokens );
+	    return io;
+	} else if ( protocol == "pve" ) {
+	    FGPVE *pve = new FGPVE;
+	    io = pve;
+	} else if ( protocol == "ray" ) {
+	    FGRAY *ray = new FGRAY;
+	    io = ray;
+	} else if ( protocol == "rul" ) {
+	    FGRUL *rul = new FGRUL;
+	    io = rul;
+        } else if ( protocol == "generic" ) {
+            size_t configToken;
+            if (tokens[1] == "socket") {
+                configToken = 7;
+            } else if (tokens[1] == "file") {
+                configToken = 5;
+            } else {
+                configToken = 6;
+            }
+
+            if (configToken >= tokens.size()) {
+                SG_LOG( SG_IO, SG_ALERT, "Not enough tokens passed for the generic protocol.");
+                return NULL;
+            }
+
+            FGGeneric *generic = new FGGeneric( tokens );
+            io = generic;
+	} else if ( protocol == "multiplay" ) {
+	    if ( tokens.size() != 5 ) {
+		SG_LOG( SG_IO, SG_ALERT, "Ignoring invalid --multiplay option "
+			"(4 arguments expected: --multiplay=dir,hz,hostname,port)" );
+		return NULL;
+	    }
+	    string dir = tokens[1];
+	    string rate = tokens[2];
+	    string host = tokens[3];
+	    string port = tokens[4];
+	    return new FGMultiplay(dir, atoi(rate.c_str()), host, atoi(port.c_str()));
+	} else {
+	    return NULL;
+	}
     }
-    
-    string medium = config.substr(begin, end - begin);
-    begin = end + 1;
-    FG_LOG( FG_IO, FG_INFO, "  medium = " << medium );
-
-    // determine direction
-    end = config.find(",", begin);
-    if ( end == string::npos ) {
-	return NULL;		// dummy
+    catch (FGProtocolConfigError& err)
+    {
+	SG_LOG( SG_IO, SG_ALERT, "Port configuration error: " << err.what() );
+	delete io;
+	return 0;
     }
     
-    string direction = config.substr(begin, end - begin);
-    begin = end + 1;
+    if (tokens.size() < 3) {
+      SG_LOG( SG_IO, SG_ALERT, "Incompatible number of network arguments.");
+      return NULL;
+    }
+    string medium = tokens[1];
+    SG_LOG( SG_IO, SG_INFO, "  medium = " << medium );
+
+    string direction = tokens[2];
     io->set_direction( direction );
-    FG_LOG( FG_IO, FG_INFO, "  direction = " << direction );
+    SG_LOG( SG_IO, SG_INFO, "  direction = " << direction );
 
-    // determine hertz
-    end = config.find(",", begin);
-    if ( end == string::npos ) {
-	return NULL;		// dummy
-    }
-    
-    string hertz_str = config.substr(begin, end - begin);
-    begin = end + 1;
+    string hertz_str = tokens[3];
     double hertz = atof( hertz_str.c_str() );
     io->set_hz( hertz );
-    FG_LOG( FG_IO, FG_INFO, "  hertz = " << hertz );
+    SG_LOG( SG_IO, SG_INFO, "  hertz = " << hertz );
 
     if ( medium == "serial" ) {
-	FGSerial *ch = new FGSerial;
-	io->set_io_channel( ch );
-
+        if ( tokens.size() < 5) {
+          SG_LOG( SG_IO, SG_ALERT, "Incompatible number of arguments for serial communications.");
+	  return NULL;
+        }
 	// device name
-	end = config.find(",", begin);
-	if ( end == string::npos ) {
-	    return NULL;
-	}
-    
-	ch->set_device( config.substr(begin, end - begin) );
-	begin = end + 1;
-	FG_LOG( FG_IO, FG_INFO, "  device = " << ch->get_device() );
+	string device = tokens[4];
+	SG_LOG( SG_IO, SG_INFO, "  device = " << device );
 
 	// baud
-	ch->set_baud( config.substr(begin) );
-	FG_LOG( FG_IO, FG_INFO, "  baud = " << ch->get_baud() );
+	string baud = tokens[5];
+	SG_LOG( SG_IO, SG_INFO, "  baud = " << baud );
 
+        
+	SGSerial *ch = new SGSerial( device, baud );
 	io->set_io_channel( ch );
     } else if ( medium == "file" ) {
-	FGFile *ch = new FGFile;
-
 	// file name
-	ch->set_file_name( config.substr(begin) );
-	FG_LOG( FG_IO, FG_INFO, "  file name = " << ch->get_file_name() );
-
+        if ( tokens.size() < 4) {
+          SG_LOG( SG_IO, SG_ALERT, "Incompatible number of arguments for file I/O.");
+	  return NULL;
+        }
+	  
+	string file = tokens[4];
+	SG_LOG( SG_IO, SG_INFO, "  file name = " << file );
+        int repeat = 1;
+        if (tokens.size() >= 7 && tokens[6] == "repeat") {
+            if (tokens.size() >= 8) {
+                repeat = atoi(tokens[7].c_str());
+                FGGeneric* generic = dynamic_cast<FGGeneric*>(io);
+                if (generic)
+                    generic->setExitOnError(true);
+            } else {
+                repeat = -1;
+            }
+        }
+	SGFile *ch = new SGFile( file, repeat );
 	io->set_io_channel( ch );
     } else if ( medium == "socket" ) {
-	// ch = new FGSocket;
+        if ( tokens.size() < 6) {
+          SG_LOG( SG_IO, SG_ALERT, "Incompatible number of arguments for socket communications.");
+	  return NULL;
+        }
+      	string hostname = tokens[4];
+	string port = tokens[5];
+	string style = tokens[6];
+
+	SG_LOG( SG_IO, SG_INFO, "  hostname = " << hostname );
+	SG_LOG( SG_IO, SG_INFO, "  port = " << port );
+	SG_LOG( SG_IO, SG_INFO, "  style = " << style );
+
+	io->set_io_channel( new SGSocket( hostname, port, style ) );
     }
 
     return io;
@@ -159,10 +301,13 @@ static FGProtocol *parse_port_config( const string& config )
 
 // step through the port config streams (from fgOPTIONS) and setup
 // serial port channels for each
-void fgIOInit() {
+void
+FGIO::init()
+{
+    // SG_LOG( SG_IO, SG_INFO, "I/O Channel initialization, " <<
+    //         globals->get_channel_options_list()->size() << " requests." );
+
     FGProtocol *p;
-    string_list channel_options_list = 
-	current_options.get_channel_options_list();
 
     // we could almost do this in a single step except pushing a valid
     // port onto the port list copies the structure and destroys the
@@ -170,236 +315,87 @@ void fgIOInit() {
 
     // parse the configuration strings and store the results in the
     // appropriate FGIOChannel structures
-    for ( int i = 0; i < (int)channel_options_list.size(); ++i ) {
-	p = parse_port_config( channel_options_list[i] );
+    typedef vector<string> container;
+    container::iterator i = globals->get_channel_options_list()->begin();
+    container::iterator end = globals->get_channel_options_list()->end();
+    for (; i != end; ++i )
+    {
+	p = parse_port_config( *i );
 	if ( p != NULL ) {
 	    p->open();
-	    global_io_list.push_back( p );
+	    io_channels.push_back( p );
 	    if ( !p->is_enabled() ) {
-		FG_LOG( FG_IO, FG_INFO, "I/O Channel config failed." );
+		SG_LOG( SG_IO, SG_ALERT, "I/O Channel config failed." );
+		exit(-1);
 	    }
 	} else {
-	    FG_LOG( FG_IO, FG_INFO, "I/O Channel parse failed." );
+	    SG_LOG( SG_IO, SG_INFO, "I/O Channel parse failed." );
 	}
     }
 }
 
-
-static void send_fgfs_out( FGIOChannel *p ) {
+void
+FGIO::reinit()
+{
 }
 
-static void read_fgfs_in( FGIOChannel *p ) {
-}
 
+// process any IO channel work
+void
+FGIO::update( double delta_time_sec )
+{
+    // cout << "processing I/O channels" << endl;
+    // cout << "  Elapsed time = " << delta_time_sec << endl;
 
-// "RUL" output format (for some sort of motion platform)
-//
-// The Baud rate is 2400 , one start bit, eight data bits, 1 stop bit,
-// no parity.
-//
-// For position it requires a 3-byte data packet defined as follows:
-//
-// First bite: ascII character "P" ( 0x50 or 80 decimal )
-// Second byte X pos. (1-255) 1 being 0* and 255 being 359*
-// Third byte Y pos.( 1-255) 1 being 0* and 255 359*
-//
-// So sending 80 127 127 to the two axis motors will position on 180*
-// The RS- 232 port is a nine pin connector and the only pins used are
-// 3&5.
-
-static void send_rul_out( FGIOChannel *p ) {
-#if 0
-    char rul[256];
-
-    FGInterface *f;
-    FGTime *t;
-
-    f = current_aircraft.fdm_state;
-    t = FGTime::cur_time_params;
-
-    // run as often as possibleonce per second
-
-    // this runs once per second
-    // if ( p->last_time == t->get_cur_time() ) {
-    //    return;
-    // }
-    // p->last_time = t->get_cur_time();
-    // if ( t->get_cur_time() % 2 != 0 ) {
-    //    return;
-    // }
-    
-    // get roll and pitch, convert to degrees
-    double roll_deg = f->get_Phi() * RAD_TO_DEG;
-    while ( roll_deg < -180.0 ) {
-	roll_deg += 360.0;
-    }
-    while ( roll_deg > 180.0 ) {
-	roll_deg -= 360.0;
-    }
+    typedef vector< FGProtocol* > container;
+    container::iterator i = io_channels.begin();
+    container::iterator end = io_channels.end();
+    for (; i != end; ++i ) {
+	FGProtocol* p = *i;
 
-    double pitch_deg = f->get_Theta() * RAD_TO_DEG;
-    while ( pitch_deg < -180.0 ) {
-	pitch_deg += 360.0;
-    }
-    while ( pitch_deg > 180.0 ) {
-	pitch_deg -= 360.0;
+	if ( p->is_enabled() ) {
+	    p->dec_count_down( delta_time_sec );
+	    double dt = 1 / p->get_hz();
+	    if ( p->get_count_down() < 0.33 * dt ) {
+	      p->process();
+	      p->inc_count();
+	      while ( p->get_count_down() < 0.33 * dt ) {
+		p->inc_count_down( dt );
+	      }
+	      // double ave = elapsed_time / p->get_count();
+	      // cout << "  ave rate = " << ave << endl;
+	    }
+	}
     }
-
-    // scale roll and pitch to output format (1 - 255)
-    // straight && level == (128, 128)
-
-    int roll = (int)( (roll_deg+180.0) * 255.0 / 360.0) + 1;
-    int pitch = (int)( (pitch_deg+180.0) * 255.0 / 360.0) + 1;
-
-    sprintf( rul, "p%c%c\n", roll, pitch);
-
-    FG_LOG( FG_IO, FG_INFO, "p " << roll << " " << pitch );
-
-    string rul_sentence = rul;
-    p->port.write_port(rul_sentence);
-#endif
 }
 
 
-// "PVE" (ProVision Entertainment) output format (for some sort of
-// motion platform)
-//
-// Outputs a 5-byte data packet defined as follows:
-//
-// First bite:  ASCII character "P" ( 0x50 or 80 decimal )
-// Second byte:  "roll" value (1-255) 1 being 0* and 255 being 359*
-// Third byte:  "pitch" value (1-255) 1 being 0* and 255 being 359*
-// Fourth byte:  "heave" value (or vertical acceleration?)
-//
-// So sending 80 127 127 to the two axis motors will position on 180*
-// The RS- 232 port is a nine pin connector and the only pins used are
-// 3&5.
-
-static void send_pve_out( FGIOChannel *p ) {
-#if 0
-    char pve[256];
-
-    FGInterface *f;
-    FGTime *t;
-
-
-    f = current_aircraft.fdm_state;
-    t = FGTime::cur_time_params;
+void
+FGIO::shutdown_all() {
+    FGProtocol *p;
 
-    // run as often as possibleonce per second
+    // cout << "shutting down all I/O channels" << endl;
 
-    // this runs once per second
-    // if ( p->last_time == t->get_cur_time() ) {
-    //    return;
-    // }
-    // p->last_time = t->get_cur_time();
-    // if ( t->get_cur_time() % 2 != 0 ) {
-    //    return;
-    // }
-    
-    // get roll and pitch, convert to degrees
-    double roll_deg = f->get_Phi() * RAD_TO_DEG;
-    while ( roll_deg <= -180.0 ) {
-	roll_deg += 360.0;
-    }
-    while ( roll_deg > 180.0 ) {
-	roll_deg -= 360.0;
-    }
+    typedef vector< FGProtocol* > container;
+    container::iterator i = io_channels.begin();
+    container::iterator end = io_channels.end();
+    for (; i != end; ++i )
+    {
+	p = *i;
 
-    double pitch_deg = f->get_Theta() * RAD_TO_DEG;
-    while ( pitch_deg <= -180.0 ) {
-	pitch_deg += 360.0;
-    }
-    while ( pitch_deg > 180.0 ) {
-	pitch_deg -= 360.0;
+	if ( p->is_enabled() ) {
+	    p->close();
+	}
     }
-
-    short int heave = (int)(f->get_W_body() * 128.0);
-
-    // scale roll and pitch to output format (1 - 255)
-    // straight && level == (128, 128)
-
-    short int roll = (int)(roll_deg * 32768 / 180.0);
-    short int pitch = (int)(pitch_deg * 32768 / 180.0);
-
-    unsigned char roll_b1, roll_b2, pitch_b1, pitch_b2, heave_b1, heave_b2;
-    roll_b1 = roll >> 8;
-    roll_b2 = roll & 0x00ff;
-    pitch_b1 = pitch >> 8;
-    pitch_b2 = pitch & 0x00ff;
-    heave_b1 = heave >> 8;
-    heave_b2 = heave & 0x00ff;
-
-    sprintf( pve, "p%c%c%c%c%c%c\n", 
-	     roll_b1, roll_b2, pitch_b1, pitch_b2, heave_b1, heave_b2 );
-
-    // printf( "p [ %u %u ]  [ %u %u ]  [ %u %u ]\n", 
-    //         roll_b1, roll_b2, pitch_b1, pitch_b2, heave_b1, heave_b2 );
-
-    FG_LOG( FG_IO, FG_INFO, "roll=" << roll << " pitch=" << pitch <<
-	    " heave=" << heave );
-
-    string pve_sentence = pve;
-    p->port.write_port(pve_sentence);
-#endif
 }
 
-
-// one more level of indirection ...
-static void process_port( FGIOChannel *p ) {
-#if 0
-    if ( p->kind == fgIOCHANNEL::FG_SERIAL_NMEA_OUT ) {
-	send_nmea_out(p);
-    } else if ( p->kind == fgIOCHANNEL::FG_SERIAL_NMEA_IN ) {
-	read_nmea_in(p);
-    } else if ( p->kind == fgIOCHANNEL::FG_SERIAL_GARMIN_OUT ) {
-	send_garmin_out(p);
-    } else if ( p->kind == fgIOCHANNEL::FG_SERIAL_GARMIN_IN ) {
-	read_garmin_in(p);
-    } else if ( p->kind == fgIOCHANNEL::FG_SERIAL_FGFS_OUT ) {
-	send_fgfs_out(p);
-    } else if ( p->kind == fgIOCHANNEL::FG_SERIAL_FGFS_IN ) {
-	read_fgfs_in(p);
-    } else if ( p->kind == fgIOCHANNEL::FG_SERIAL_RUL_OUT ) {
-	send_rul_out(p);
-    } else if ( p->kind == fgIOCHANNEL::FG_SERIAL_PVE_OUT ) {
-	send_pve_out(p);
-    }
-#endif
+void
+FGIO::bind()
+{
 }
 
-
-// process any serial port work
-void fgIOProcess() {
-    FGProtocol *p;
-
-    // cout << "processing I/O channels" << endl;
-
-    static int inited = 0;
-    int interval;
-    static FGTimeStamp last;
-    FGTimeStamp current;
-
-    if ( ! inited ) {
-	inited = 1;
-	last.stamp();
-	interval = 0;
-    } else {
-        current.stamp();
-	interval = current - last;
-	last = current;
-    }
-
-    for ( int i = 0; i < (int)global_io_list.size(); ++i ) {
-	// cout << "  channel = " << i << endl;
-	p = global_io_list[i];
-
-	if ( p->is_enabled() ) {
-	    p->dec_count_down( interval );
-	    if ( p->get_count_down() < 0 ) {
-		p->process();
-		p->set_count_down( 1000000.0 / p->get_hz() );
-	    }
-	}
-    }
+void
+FGIO::unbind()
+{
 }
+