47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
// Copyright 2012 The ChromiumOS Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <gtest/gtest.h> // for FRIEND_TEST
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#include <linux/limits.h>
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#include "include/macros.h"
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#ifndef GESTURES_TRACE_MARKER_H__
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#define GESTURES_TRACE_MARKER_H__
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#define TRACE_WRITE(x) TraceMarker::StaticTraceWrite(x)
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namespace gestures {
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// This class is used for writing message into the debugfs tracing system
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// based on Ftrace provided by linux.
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// By default, the debugfs is mounted at /sys/kernel/debug/
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// It will automatically help you handle the detail things. If you want to
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// write a message into tracing system, you can simply use
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// TRACE_WRITE("MESSAGE") and you can find the message appears in the file
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// debugfs/tracing/trace
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class TraceMarker {
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FRIEND_TEST(TraceMarkerTest, DeleteTraceMarkerTest);
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public:
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static void CreateTraceMarker();
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static void DeleteTraceMarker();
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static void StaticTraceWrite(const char* str);
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static TraceMarker* GetTraceMarker();
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void TraceWrite(const char* str);
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private:
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TraceMarker();
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~TraceMarker();
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DISALLOW_COPY_AND_ASSIGN(TraceMarker);
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static TraceMarker* trace_marker_;
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static int trace_marker_count_;
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int fd_;
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bool FindDebugfs(const char** ret) const;
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bool FindTraceMarker(char** ret) const;
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bool OpenTraceMarker();
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};
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} // namespace gestures
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#endif // GESTURES_TRACE_MARKER_H__
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