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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
*
*/
using GLib;
public delegate void FsoFramework.KObjectNotifierFunc( HashTable<string, string> properties );
[Compact]
internal class KObjectDelegateHolder
{
public FsoFramework.KObjectNotifierFunc func;
public KObjectDelegateHolder( FsoFramework.KObjectNotifierFunc func )
{
this.func = func;
}
}
/**
* @class FsoFramework.BaseKObjectNotifier
**/
public class FsoFramework.BaseKObjectNotifier : Object
{
public static BaseKObjectNotifier instance;
private int fd = -1;
private uint watch;
private IOChannel channel;
private char[] buffer;
private const ssize_t BUFFER_LENGTH = 4096;
private HashTable<string, List<KObjectDelegateHolder>> add;
private HashTable<string, List<KObjectDelegateHolder>> change;
private HashTable<string, List<KObjectDelegateHolder>> remove;
public BaseKObjectNotifier()
{
buffer = new char[BUFFER_LENGTH];
add = new HashTable<string, List<KObjectDelegateHolder>>( str_hash, str_equal );
change = new HashTable<string, List<KObjectDelegateHolder>>( str_hash, str_equal );
remove = new HashTable<string, List<KObjectDelegateHolder>>( str_hash, str_equal );
fd = Posix.socket( Linux.Socket.AF_NETLINK, Posix.SOCK_DGRAM, Linux.Netlink.NETLINK_KOBJECT_UEVENT );
assert( fd != -1 );
Linux.Netlink.SockAddrNl addr = { Linux.Socket.AF_NETLINK,
0,
Posix.getpid(),
1 };
var res = Posix.bind( fd, &addr, sizeof( Linux.Netlink.SockAddrNl ) );
assert( res != -1 );
channel = new IOChannel.unix_new( fd );
watch = channel.add_watch( IOCondition.IN | IOCondition.HUP, onActionFromSocket );
}
~BaseKObjectNotifier()
{
if ( watch != 0 )
Source.remove( watch );
if ( fd != -1 )
Posix.close( fd );
}
protected bool onActionFromSocket( IOChannel source, IOCondition condition )
{
if ( ( condition & IOCondition.HUP ) == IOCondition.HUP )
{
FsoFramework.theLogger.error( "HUP on kobject uevent socket, will no longer get any notifications" );
return false;
}
if ( ( condition & IOCondition.IN ) == IOCondition.IN )
{
assert( fd != -1 );
assert( buffer != null );
ssize_t bytesread = Posix.read( fd, buffer, BUFFER_LENGTH );
for( int i = 0; i < bytesread-1; ++i )
if ( buffer[i] == 0x00 )
buffer[i] = 0x09;
var parts = ( (string)buffer ).split( "\t" );
handleMessage( parts );
return true;
}
critical( "Unsupported IOCondition %u", (int)condition );
return true;
}
protected void handleMessage( string[] parts )
{
var properties = new HashTable<string, string>( str_hash, str_equal );
foreach ( var part in parts )
{
message( "%s", part );
var elements = part.split( "=" );
if ( elements.length == 2 )
{
properties.insert( elements[0], elements[1] );
}
}
var action = properties.lookup( "ACTION" );
assert( action != null );
var subsystem = properties.lookup( "SUBSYSTEM" );
assert( subsystem != null );
#if DEBUG
debug( @"Dealing with action $action for subsystem $subsystem" );
#endif
HashTable<string, List<KObjectDelegateHolder>> table = null;
switch( action )
{
case "add":
table = add;
break;
case "change":
table = change;
break;
case "remove":
table = remove;
break;
default:
FsoFramework.theLogger.warning( @"Unsupported kobject message action $action, must be one of { add, change, remove }" );
break;
}
weak List<weak KObjectDelegateHolder> list = table.lookup( subsystem );
if ( list == null )
return;
foreach( var delegateholder in list )
delegateholder.func( properties );
}
protected void _addMatch( string action, string subsystem, KObjectNotifierFunc callback )
{
HashTable<string, List<KObjectDelegateHolder>> table = null;
switch( action )
{
case "add":
table = add;
break;
case "change":
table = change;
break;
case "remove":
table = remove;
break;
default:
FsoFramework.theLogger.warning( @"Unsupported action $action in _addMatch, must be one of { add, change, remove }" );
break;
}
weak List<KObjectDelegateHolder> list = table.lookup( subsystem );
if ( list == null )
{
List<KObjectDelegateHolder> newlist = new List<KObjectDelegateHolder>();
newlist.append( new KObjectDelegateHolder( callback ) );
#if DEBUG
debug( @"# delegates for action $action and subsystem $subsystem now $(newlist.length())" );
#endif
table.insert( subsystem, (owned) newlist );
}
else
{
list.append( new KObjectDelegateHolder( callback ) );
#if DEBUG
debug( @"# delegates for action $action and subsystem $subsystem now $(list.length())" );
#endif
}
}
//
// public API
//
public static void addMatch( string action, string subsystem, KObjectNotifierFunc callback )
{
if ( BaseKObjectNotifier.instance == null )
BaseKObjectNotifier.instance = new BaseKObjectNotifier();
BaseKObjectNotifier.instance._addMatch( action, subsystem, callback );
}
}
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