Incidentally, might I suggest something to the effect of:

#!/bin/rc

fn cleanup { for(i in $apids) { echo kill >/proc/$i/note } }
fn sigint { cleanup }
fn sigterm { cleanup }

apids=()
for(f) {
  	tail -f $f | sed 's/^/'$f:/ &
	apids = ($apids $apid)
}

wait