From 5ceaf66079451b08c66c28cff6f975e479b45c4a Mon Sep 17 00:00:00 2001
From: Geraldo Nascimento <geraldogabriel@gmail.com>
Date: Tue, 3 May 2022 18:56:28 -0300
Subject: [PATCH] v4l: O_NONBLOCK flag should be OR'ed to O_RDWR or mmap will
 fail below

Closes #1299
---
 panda/src/vision/webcamVideoCursorV4L.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/panda/src/vision/webcamVideoCursorV4L.cxx b/panda/src/vision/webcamVideoCursorV4L.cxx
index 197bda3228..1939b16912 100644
--- a/panda/src/vision/webcamVideoCursorV4L.cxx
+++ b/panda/src/vision/webcamVideoCursorV4L.cxx
@@ -217,7 +217,7 @@ WebcamVideoCursorV4L(WebcamVideoV4L *src) : MovieVideoCursor(src) {
 
   int mode = O_RDWR;
   if (!v4l_blocking) {
-    mode = O_NONBLOCK;
+    mode |= O_NONBLOCK;
   }
 
   _fd = open(src->_device.c_str(), mode);