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midipipe: add reader mode

poor man's not-9p server

--- a/bin/midipipe

+++ b/bin/midipipe

@@ -1,4 +1,6 @@

 #!/bin/rc

+rfork en

+

 fn cleanup{

 	rm -f /srv/midi

 }

@@ -10,10 +12,17 @@

 	cleanup

 }

-rfork n

+r=()

+if(~ $1 -r){

+	r=1

+	shift

+}

 rm -f /srv/midi

 bind -a '#|' /mnt/midi

 <>[3]/mnt/midi/data1 {

 	echo 3 >/srv/midi

-	cat $* >/mnt/midi/data

+	if(! ~ $#r 0)

+		cat /mnt/midi/data

+	if not

+		cat $* >/mnt/midi/data

 }