test: fence: Check write return value

The ::write() function used to signal a framebuffer fence in the unit
test is marked with the 'warn_unused_result'.

When building in debugoptimized mode not checking for the return
value causes issues at build time:
/test/fence.cpp:254:2: error: ignoring return value of function declared with 'warn_unused_result' attribute

Fix that by checking the ::write() return value and emitting an
error message in case the write fails.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reported-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/test/fence.cpp b/test/fence.cpp
index d2dfc9b6..d2865398 100644
--- a/test/fence.cpp
+++ b/test/fence.cpp
@@ -251,7 +251,12 @@ void FenceTest::requestComplete(Request *request)
 void FenceTest::signalFence()
 {
 	uint64_t value = 1;
-	write(efd2_, &value, sizeof(value));
+	int ret;
+
+	ret = write(efd2_, &value, sizeof(value));
+	if (ret != sizeof(value))
+		cerr << "Failed to signal fence" << endl;
+
 	dispatcher_->processEvents();
 }