From d841bec8d26615df776fc6573157c9532f226aff Mon Sep 17 00:00:00 2001
From: Oliver Smith <osmith@sysmocom.de>
Date: Tue, 21 Dec 2021 19:17:51 +0100
Subject: [PATCH] select_main: don't poll forever during shutdown

Do not poll without timeout during shutdown if no timers are pending.

Change-Id: I81c64a7ae440304522c2179c212023a566ddced8
---
 src/select.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/select.c b/src/select.c
index b48d13e76..ddff13297 100644
--- a/src/select.c
+++ b/src/select.c
@@ -372,14 +372,20 @@ static int _osmo_select_main(int polling)
 {
 	unsigned int n_poll;
 	int rc;
+	int timeout = 0;
 
 	/* prepare read and write fdsets */
 	n_poll = poll_fill_fds();
 
-	if (!polling)
+	if (!polling) {
 		osmo_timers_prepare();
+		timeout = osmo_timers_nearest_ms();
 
-	rc = poll(g_poll.poll, n_poll, polling ? 0 : osmo_timers_nearest_ms());
+		if (_osmo_select_shutdown_requested && timeout == -1)
+			timeout = 0;
+	}
+
+	rc = poll(g_poll.poll, n_poll, timeout);
 	if (rc < 0)
 		return 0;