Add a test for the TCP_USER_TIMEOUT option. (#1192)

* Add a test for the TCP_USER_TIMEOUT option.
* Explicitly set errno to ENOTSUP on unsupported OS's

1 files changed, 1 insertions, 0 deletions

diff --git a/net.c b/net.c
index 3968acc..1e01638 100644
--- a/net.c
+++ b/net.c
@@ -234,6 +234,7 @@ int redisContextSetTcpUserTimeout(redisContext *c, unsigned int timeout) {
     res = setsockopt(c->fd, IPPROTO_TCP, TCP_USER_TIMEOUT, &timeout, sizeof(timeout));
 #else
     res = -1;
+    errno = ENOTSUP;
     (void)timeout;
 #endif
     if (res == -1) {