suspending a QProcess

[qt_gotcha]

I am trying to suspend a Qprocess and thought about using a function linked to a toolButton that toggles

if (pause)
	calcProcess->waitForBytesWritten(-1);
else
	{
		char buf[8];
		buf[0]='\0';
		calcProcess->write(buf, 8);
	}

if (pause)
	calcProcess->waitForBytesWritten(-1);
else
	{
		char buf[8];
		buf[0]='\0';
		calcProcess->write(buf, 8);
	}

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I hoped waitForBytesWritten might suspend the Qproces until I write some bytes to it. The proces doesn't take any writing BTW, it only emits character.
Is there a way to do this?
I could implement the proces in a QThread but suspening the thread would not suspend the process, or would it?