45bd125dccdc7aef32af99cc6624a74dd2e24371
				
			
			
		
	is so that programs can get information about the controlling terminal. This change was triggered by bug #188506 where it's possible that stdin, stdout and stderr didn't point to a terminal but ended up on one via our pipes. Using a pty means that stdout and stderr always point to a terminal, but we lose the ability to tell them apart. If there is not a pty available then we use un-prefixed output as normal. This change has also introduced the need for a signal pipe so that SIGCHLD can exit the loop cleanly.
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