From 1e359d232451f19d668359ff5da79e3db021e99d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Moritz=20=27Morty=27=20Str=C3=BCbe?= <morty@gmx.net>
Date: Fri, 8 May 2015 09:14:40 +0200
Subject: [PATCH] Improve O_SYNC logic

---
 tools/sky/serialdump.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/sky/serialdump.c b/tools/sky/serialdump.c
index 447999026..d0e7fac3c 100644
--- a/tools/sky/serialdump.c
+++ b/tools/sky/serialdump.c
@@ -164,8 +164,11 @@ main(int argc, char **argv)
   }
   fprintf(stderr, "connecting to %s (%s)", device, speedname);
 
-#ifndef __APPLE__
+#ifdef O_SYNC
   fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY | O_DIRECT | O_SYNC);
+  if(fd < 0 && errno == EINVAL){ // O_SYNC not supported (e.g. raspberian)
+    fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY | O_DIRECT);
+  }
 #else
   fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY | O_SYNC );
 #endif