From 69a909fc4cb3d061cc02649ab78ae055ef08fc67 Mon Sep 17 00:00:00 2001
From: DL6ER <dl6er@dl6er.de>
Date: Wed, 11 Dec 2019 21:47:46 +0000
Subject: [PATCH] On modification of lists, we should send real-time signal 0
 instead of SIGHUP. This also preserves the DNS cache of not-blocked domains.

Signed-off-by: DL6ER <dl6er@dl6er.de>
---
 advanced/Scripts/list.sh |  2 +-
 pihole                   | 14 +++++++++++---
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/advanced/Scripts/list.sh b/advanced/Scripts/list.sh
index c5bf5b2a..320d4ae8 100755
--- a/advanced/Scripts/list.sh
+++ b/advanced/Scripts/list.sh
@@ -257,5 +257,5 @@ echo "DONE"
 fi
 
 if [[ "${reload}" != false ]]; then
-    pihole restartdns reload
+    pihole restartdns reload-lists
 fi
diff --git a/pihole b/pihole
index f0195843..cc7e1b7c 100755
--- a/pihole
+++ b/pihole
@@ -105,17 +105,25 @@ restartDNS() {
   svcOption="${1:-restart}"
 
   # Determine if we should reload or restart
-  if [[ "${svcOption}" =~ "reload" ]]; then
-    # Reload has been requested
+  if [[ "${svcOption}" =~ "reload-lists" ]]; then
+    # Reloading of the lists has been requested
+    # Note: This will NOT re-read any *.conf files
+    # Note 2: We cannot use killall here as it does
+    #         not know about real-time signals
+    svc="kill -SIGRTMIN $(pidof ${resolver})"
+    str="Reloading DNS lists"
+  elif [[ "${svcOption}" =~ "reload" ]]; then
+    # Reloading of the DNS cache has been requested
     # Note: This will NOT re-read any *.conf files
     svc="killall -s SIGHUP ${resolver}"
+    str="Flushing DNS cache"
   else
     # A full restart has been requested
     svc="service ${resolver} restart"
+    str="Restarting DNS server"
   fi
 
   # Print output to Terminal, but not to Web Admin
-  str="${svcOption^}ing DNS service"
   [[ -t 1 ]] && echo -ne "  ${INFO} ${str}..."
 
   output=$( { ${svc}; } 2>&1 )