From da9bd55e06e0820bf0ed2f2eaf3fd12af91f717c Mon Sep 17 00:00:00 2001
From: Stephen Seo <seo.disparate@gmail.com>
Date: Mon, 4 Mar 2019 15:27:01 +0900
Subject: [PATCH] Add check for no pkt received (non-blocking)

---
 src/UDPConnection.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/UDPConnection.c b/src/UDPConnection.c
index 609cddc..50b61f8 100644
--- a/src/UDPConnection.c
+++ b/src/UDPConnection.c
@@ -4,6 +4,7 @@
 #include <string.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <errno.h>
 
 UDPC_Context* UDPC_init(uint16_t listenPort, int isClient)
 {
@@ -460,6 +461,13 @@ void UDPC_update(UDPC_Context *ctx)
         0,
         (struct sockaddr*) &receivedData,
         &receivedDataSize);
+
+    if(bytes == 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
+    {
+        // expected result for non-blocking socket
+        return;
+    }
+
     if(bytes < 20)
     {
         UDPC_INTERNAL_log(ctx, 2, "Got invalid packet from %s port %d (too small)",