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/*
* Copyright (C) 2009-2010 Michael 'Mickey' Lauer <mlauer@vanille-media.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
* @interface FsoFramework.IProcessGuard
**/
public interface FsoFramework.IProcessGuard : GLib.Object
{
public abstract bool launch( string[] command );
public abstract void stop( int sig = Posix.SIGTERM );
public abstract void setAutoRelaunch( bool on );
public abstract bool sendSignal( int sig );
public abstract bool isRunning();
public signal void running();
public signal void stopped();
}
/**
* @class FsoFramework.GProcessGuard
**/
public class FsoFramework.GProcessGuard : FsoFramework.IProcessGuard, GLib.Object
{
private Pid pid;
private uint watch;
private string[] command;
private bool relaunch;
public Posix.pid_t _pid()
{
return (Posix.pid_t)pid;
}
~GProcessGuard()
{
if ( pid != (Pid)0 )
{
#if DEBUG
warning( "Guard being freed, while child %d still running. This is most likely a bug in your problem. Trying to kill the child in a synchronous way...", (int)pid );
#endif
relaunch = false;
syncStop();
}
}
public bool launch( string[] command )
{
this.command = command; // save for possible relaunching
if ( pid != (Pid)0 )
{
warning( @"Can't launch $(command[0]); already running as pid %d".printf( (int)pid ) );
return false;
}
try
{
GLib.Process.spawn_async( GLib.Environment.get_variable( "PWD" ),
command,
null,
GLib.SpawnFlags.DO_NOT_REAP_CHILD | GLib.SpawnFlags.SEARCH_PATH,
null,
out pid );
}
catch ( SpawnError e )
{
warning( @"Can't spawn $(command[0]): $(strerror(errno))" );
return false;
}
watch = GLib.ChildWatch.add( pid, onChildWatchEvent );
this.running(); // SIGNAL
return true;
}
public bool launchWithPipes( string[] command, out int fdin, out int fdout )
{
this.command = command; // save for possible relaunching
if ( pid != (Pid)0 )
{
warning( @"Can't launch $(command[0]); already running as pid %d".printf( (int)pid ) );
return false;
}
try
{
GLib.Process.spawn_async_with_pipes(
GLib.Environment.get_variable( "PWD" ),
command,
null,
GLib.SpawnFlags.DO_NOT_REAP_CHILD | GLib.SpawnFlags.SEARCH_PATH,
null,
out pid,
out fdin,
out fdout,
null );
}
catch ( SpawnError e )
{
warning( @"Can't spawn w/ pipes $(command[0]): $(e.message))" );
return false;
}
watch = GLib.ChildWatch.add( pid, onChildWatchEvent );
this.running(); // SIGNAL
return true;
}
// FIXME: consider making this async?
public void stop( int sig = Posix.SIGTERM )
{
stopSendStopped( true );
}
public void setAutoRelaunch( bool on )
{
relaunch = on;
}
public bool sendSignal( int sig )
{
if ( pid == (Pid)0 )
{
return false;
}
var res = Posix.kill( (Posix.pid_t)pid, sig );
return res == 0;
}
public bool isRunning()
{
return ( pid != (Pid)0 );
}
//
// private API
//
private void stopSendStopped( bool send )
{
_stop( send );
}
private void cleanupResources()
{
if ( watch > 0 )
{
GLib.Source.remove( watch );
}
GLib.Process.close_pid( pid );
pid = 0;
this.stopped();
}
private void onChildWatchEvent( Pid pid, int status )
{
if ( this.pid != pid )
{
critical( "D'OH!" );
return;
}
#if DEBUG
debug( "CHILD WATCH EVENT FOR %d: %d", (int)pid, status );
#endif
pid = 0;
cleanupResources();
if ( relaunch )
{
#if DEBUG
debug( "Relanching requested..." );
#endif
if ( ! launch( command ) )
{
warning( @"Could not relaunch $(command[0]); disabling." );
relaunch = false;
}
}
}
internal const int KILL_SLEEP_TIMEOUT = 1000 * 1000 * 5; // 5 seconds
internal const int KILL_SLEEP_INTERVAL = 1000 * 1000 * 1; // 1 second
private async void _stop( bool send )
{
if ( (Posix.pid_t)pid == 0 )
{
return;
}
#if DEBUG
debug( "Attempting to stop pid %d - sending SIGTERM first...", pid );
#endif
Posix.kill( (Posix.pid_t)pid, Posix.SIGTERM );
var done = false;
var timer = new GLib.Timer();
timer.start();
while ( !done && pid != 0 )
{
var pid_result = Posix.waitpid( (Posix.pid_t)pid, null, Posix.WNOHANG );
#if DEBUG
debug( "Waitpid result %d", pid_result );
#endif
if ( pid_result < 0 )
{
done = true;
#if DEBUG
debug( "Failed to wait for process to exit: waitpid returned %d", pid_result );
#endif
}
else if ( pid_result == 0 )
{
if ( timer.elapsed() >= KILL_SLEEP_TIMEOUT )
{
#if DEBUG
debug( "Timeout for pid %d elapsed, exiting wait loop", pid );
#endif
done = true;
}
else
{
#if DEBUG
debug( "Process %d is still running, waiting...", pid );
#endif
Timeout.add_seconds( 1, _stop.callback );
yield;
}
}
else /* pid_result > 0 */
{
done = true;
#if DEBUG
debug( "Process %d terminated normally", pid );
#endif
GLib.Process.close_pid( pid );
pid = 0;
}
}
if ( pid != 0 )
{
warning( "Process %d ignored SIGTERM, sending SIGKILL", pid );
if ( watch > 0 )
{
GLib.Source.remove( watch );
watch = 0;
}
Posix.kill( (Posix.pid_t)pid, Posix.SIGKILL );
Thread.usleep( 1000 );
pid = 0;
#if DEBUG
debug( "Process %d stop complete", pid );
#endif
}
if ( send )
{
this.stopped();
}
}
private void syncStop()
{
if ( watch > 0 )
{
GLib.Source.remove( watch );
watch = 0;
}
#if DEBUG
debug( "Attempting to syncstop pid %d - sending SIGTERM first...", pid );
#endif
Posix.kill( (Posix.pid_t)pid, Posix.SIGTERM );
var done = false;
var timer = new GLib.Timer();
timer.start();
while ( !done && pid != 0 )
{
var pid_result = Posix.waitpid( (Posix.pid_t)pid, null, Posix.WNOHANG );
#if DEBUG
debug( "Waitpid result %d", pid_result );
#endif
if ( pid_result < 0 )
{
done = true;
#if DEBUG
debug( "Failed to syncwait for process to exit: waitpid returned %d", pid_result );
#endif
}
else if ( pid_result == 0 )
{
if ( timer.elapsed() >= KILL_SLEEP_TIMEOUT )
{
#if DEBUG
debug( "Timeout for pid %d elapsed, exiting syncwait loop", pid );
#endif
done = true;
}
else
{
#if DEBUG
debug( "Process %d is still running, sync waiting...", pid );
#endif
Thread.usleep( KILL_SLEEP_INTERVAL );
}
}
else /* pid_result > 0 */
{
done = true;
#if DEBUG
debug( "Process %d terminated normally", pid );
#endif
GLib.Process.close_pid( pid );
pid = 0;
}
}
if ( pid != 0 )
{
warning( "Process %d ignored SIGTERM, sending SIGKILL", pid );
if ( watch > 0 )
{
GLib.Source.remove( watch );
}
Posix.kill( (Posix.pid_t)pid, Posix.SIGKILL );
Thread.usleep( 1000 );
pid = 0;
#if DEBUG
debug( "Process %d stop complete", pid );
#endif
}
}
}
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