From 0d0a55684799f5b6c448eb21b5a64f1dd4466a79 Mon Sep 17 00:00:00 2001
From: Lorenz Meier <lorenz@px4.io>
Date: Tue, 1 Jan 2019 16:23:46 +0100
Subject: [PATCH] Fix usage of errno in POSIX semaphore error handling

Previous commit 98ae0186e93 changed the err variable to errno, which is not the return value we are looking for.
---
 platforms/posix/src/px4_layer/px4_sem.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/platforms/posix/src/px4_layer/px4_sem.cpp b/platforms/posix/src/px4_layer/px4_sem.cpp
index 355d409feb..c5d9e241ed 100644
--- a/platforms/posix/src/px4_layer/px4_sem.cpp
+++ b/platforms/posix/src/px4_layer/px4_sem.cpp
@@ -142,7 +142,7 @@ int px4_sem_timedwait(px4_sem_t *s, const struct timespec *abstime)
 
 	int err = ret;
 
-	if (err != 0 && errno != ETIMEDOUT) {
+	if (err != 0 && err != ETIMEDOUT) {
 		setbuf(stdout, nullptr);
 		setbuf(stderr, nullptr);
 		const unsigned NAMELEN = 32;