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rcpu: post hangup note to remote when connection breaks

when the cat that forwards notes on the remote exits,
send a hangup note so processes wont keep hanging arround.

--- a/rc/bin/rcpu

+++ b/rc/bin/rcpu

@@ -23,11 +23,11 @@

 	if(test -d /mnt/term/mnt/cpunote) {

 		rfork e

 		mainproc=$apid

-		exec cat </mnt/term/mnt/cpunote/data >/proc/$mainproc/notepg &

+		{cat; echo -n hangup} </mnt/term/mnt/cpunote/data >/proc/$mainproc/notepg &

 		noteproc=$apid

 		wait $mainproc

 		echo -n $status >/mnt/term/env/rstatus >[2]/dev/null

-		echo -n kill >/proc/$noteproc/note

+		echo -n hangup >/proc/$noteproc/notepg

 	}

 }