From 1b208ec3f5f303ed93d958b3d8f6d5732cf1a245 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 01 Jun 2018 22:56:37 -0400
Subject: bin/rc: Close and reopen RC FIFO to make read block

Otherwise, after every command is read and handled, the read utility
immediately returns failure due to EOF on every call until another
command is written to the RC FIFO, causing the listening loop to become
busy and burn CPU time.
---
diff --git a/bin/rc b/bin/rc
index 4ce2fdb..ae77113 100755
--- a/bin/rc
+++ b/bin/rc
@@ -145,7 +145,7 @@ listen()
 	local arg=
 
 	while :; do
-		if read -r magic cmd arg; then
+		if read -r magic cmd arg 0<"${rc_fifo}"; then
 			case "${magic}" in "${MAGIC}");; *) continue;; esac
 			case "${cmd}" in
 				'beg' | 'end')
@@ -168,7 +168,7 @@ listen()
 					;;
 			esac
 		fi
-	done 0<"${rc_fifo}"
+	done
 
 	return 0
 }
--
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