From c184da4342179917b27691d6a996917ddaf998da Mon Sep 17 00:00:00 2001
From: Scott Richardson <scott.richardson@visionsystemsinc.com>
Date: Wed, 13 May 2020 17:17:57 -0400
Subject: [PATCH] bugfix: this was causing a trap in macOS; see issue #242

---
 linux/signal_tools.bsh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/linux/signal_tools.bsh b/linux/signal_tools.bsh
index 7de84ec86..4e21fd824 100644
--- a/linux/signal_tools.bsh
+++ b/linux/signal_tools.bsh
@@ -72,7 +72,7 @@ function trap_chain()
 
     # Since there was no signal already assigned, the sanitize signal name is
     # not in last_info, so we'll have to make it
-    last_info="$(trap '' "${2}"; trap -p "${2}" | { read x ; echo "${x##* }"; })"
+    last_info="$((trap '' "${2}"; trap -p "${2}") | { read x ; echo "${x##* }"; })"
 
     clear_a "_TRAP_CHAIN_${last_info}"
     last_info="_TRAP_CHAIN_${last_info}_LAST_PID"