From 82646a9023aac6a73a7b7fddfbbee0565290d5de Mon Sep 17 00:00:00 2001
From: Molly Miller <33266253+sysvinit@users.noreply.github.com>
Date: Wed, 7 Dec 2022 02:06:51 +0100
Subject: [PATCH] Add explicit SIGTERM and SIGINT handlers. (#1106)

coturn running inside a docker container runs as PID 1, however PID 1
has special signal handling semantics (see the note at the bottom of the
section
[here](https://docs.docker.com/engine/reference/run/#foreground)).
coturn relies on the default behaviour of SIGTERM to terminate the
process, however as no signal handler is explicitly installed, it
doesn't respond to SIGTERM when running inside a container. This PR
fixes this problem by installing explicit signal handlers for SIGINT and
SIGTERM, which trigger the same termination mechanism as the admin
interface "halt" command.

This is a port of wireapp#6 for upstream.
---
 src/apps/relay/mainrelay.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/apps/relay/mainrelay.c b/src/apps/relay/mainrelay.c
index 0e6e0d6..ef5da09 100644
--- a/src/apps/relay/mainrelay.c
+++ b/src/apps/relay/mainrelay.c
@@ -265,6 +265,8 @@ static char procgroupname[1025] = "\0";
 static void read_config_file(int argc, char **argv, int pass);
 static void reload_ssl_certs(evutil_socket_t sock, short events, void *args);
 
+static void shutdown_handler(evutil_socket_t sock, short events, void *args);
+
 //////////////////////////////////////////////////
 
 static int make_local_listeners_list(void) {
@@ -3211,6 +3213,11 @@ int main(int argc, char **argv) {
 #else
   struct event *ev = evsignal_new(turn_params.listener.event_base, SIGUSR2, reload_ssl_certs, NULL);
   event_add(ev, NULL);
+
+  ev = evsignal_new(turn_params.listener.event_base, SIGTERM, shutdown_handler, NULL);
+  event_add(ev, NULL);
+  ev = evsignal_new(turn_params.listener.event_base, SIGINT, shutdown_handler, NULL);
+  event_add(ev, NULL);
 #endif
 
   drop_privileges();
@@ -3821,4 +3828,12 @@ static void reload_ssl_certs(evutil_socket_t sock, short events, void *args) {
   UNUSED_ARG(args);
 }
 
+static void shutdown_handler(evutil_socket_t sock, short events, void *args) {
+  TURN_LOG_FUNC(TURN_LOG_LEVEL_INFO, "Terminating on signal %d\n", sock);
+  turn_params.stop_turn_server = 1;
+
+  UNUSED_ARG(events);
+  UNUSED_ARG(args);
+}
+
 ///////////////////////////////