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NSTask waitForDataInBackgroundAndNotify and waitUntilExit

I am trying to make use of "waitForDataInBackgroundAndNotify" when executing a script. I've setup the task like this

	NSTask *task = [[NSTask alloc] init];
	[task setLaunchPath:path];
	[task setArguments:args];

	NSPipe *outPipe = [NSPipe pipe];
	[task setStandardOutput:outPipe];
	NSFileHandle *outFile = [outPipe fileHandleForReading];

	NSPipe *errPipe = [NSPipe pipe];
	[task setStandardError:errPipe];
	NSFileHandle *errFile = [errPipe fileHandleForReading];

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(errData:)
name:NSFileHandleDataAvailableNotification
object:errFile];

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(outData:)
name:NSFileHandleDataAvailableNotification
object:outFile];

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(terminated:)
name:NSTaskDidTerminateNotification
object:task];

    [outFile waitForDataInBackgroundAndNotify];
    [errFile waitForDataInBackgroundAndNotify];

    NSLog(@"launching command");
	[task launch];

    NSLog(@"waiting for command to finsh");
    [task waitUntilExit];

and while the I get and handle the "outData" call.

-(void) outData: (NSNotification *) notification
{
NSFileHandle *fileHandle = (NSFileHandle*) [notification object];

        NSLog(@"received out data");

        NSData *data = [fileHandle availableData];

if ([data length]) {
NSLog(@"appending out data");
[output appendString:[NSString stringWithCString:[data bytes] encoding: NSUTF8StringEncoding]];
}

        [fileHandle waitForDataInBackgroundAndNotify];

        NSLog(@"receiving out done");
    }

There is seems to be no NSTaskDidTerminateNotification and the task is just sits there and waits

    launching command
    waiting for command to finsh
    received out data
    appending out data
    receiving out done

While there is a lot to find about NSTask and waitUntilExit on the net I could not find anything when waitForDataInBackgroundAndNotify is used.
Pointers what I am doing wrong?

cheers
--
Torsten
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