From 624f68896767e1831ae656dbd7d4634e2ab6f342 Mon Sep 17 00:00:00 2001
From: Willem Toorop <willem@nlnetlabs.nl>
Date: Wed, 26 May 2021 15:57:52 +0200
Subject: [PATCH] Honour the claim from documentation: When not set (the
 default), the system default is left alone.

---
 src/stub.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/stub.c b/src/stub.c
index 49d2ac9d..afe03459 100644
--- a/src/stub.c
+++ b/src/stub.c
@@ -487,7 +487,8 @@ tcp_connect(getdns_upstream *upstream, getdns_transport_list_t transport,
 		return -1;
 
 	getdns_sock_nonblock(fd);
-	getdns_sock_tcp_send_timeout(upstream, fd, send_timeout);
+	if (send_timeout != -1)
+		getdns_sock_tcp_send_timeout(upstream, fd, send_timeout);
 #ifdef USE_OSX_TCP_FASTOPEN
 	sa_endpoints_t endpoints;
 	endpoints.sae_srcif = 0;