From 876d4ebd76144f8a4030890a95dc2379d6ce522e Mon Sep 17 00:00:00 2001
From: Julian Oes <julian@oes.ch>
Date: Wed, 14 Nov 2018 14:48:38 +0100
Subject: [PATCH] posix: remove appalling errno hack

---
 src/lib/cdev/posix/cdev_platform.cpp | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/src/lib/cdev/posix/cdev_platform.cpp b/src/lib/cdev/posix/cdev_platform.cpp
index 46fac1590a..4fa9fc78ee 100644
--- a/src/lib/cdev/posix/cdev_platform.cpp
+++ b/src/lib/cdev/posix/cdev_platform.cpp
@@ -389,21 +389,10 @@ extern "C" {
 				nsecs -= (nsecs / billion) * billion;
 				ts.tv_nsec = nsecs;
 
-				// Execute a blocking wait for that time in the future
-				errno = 0;
-
 				ret = px4_sem_timedwait(&sem, &ts);
-#ifndef __PX4_DARWIN
-				ret = errno;
-#endif
 
-				// Ensure ret is negative on failure
-				if (ret > 0) {
-					ret = -ret;
-				}
-
-				if (ret && ret != -ETIMEDOUT) {
-					PX4_WARN("%s: px4_poll() sem error", thread_name);
+				if (ret && errno != ETIMEDOUT) {
+					PX4_WARN("%s: px4_poll() sem error: %s", thread_name, strerror(errno));
 				}
 
 			} else if (timeout < 0) {