From 82eb5e432357f756c565cfc325899b22ac60f1d7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Josef=20S=C3=B6ntgen?= <josef.soentgen@genode-labs.com>
Date: Wed, 21 Aug 2013 16:57:46 +0200
Subject: [PATCH] base: only commit useful trace events

If the length of a trace event entry is zero it should be ommitted.

Fixes #851.
---
 base/include/base/trace/buffer.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/base/include/base/trace/buffer.h b/base/include/base/trace/buffer.h
index a11bbb76e..baf05f961 100644
--- a/base/include/base/trace/buffer.h
+++ b/base/include/base/trace/buffer.h
@@ -76,6 +76,10 @@ class Genode::Trace::Buffer
 
 		void commit(size_t len)
 		{
+			/* omit empty entries */
+			if (len == 0)
+				return;
+
 			_head_entry()->len = len;
 
 			/* advance head offset, wrap when reaching buffer boundary */