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diff --git a/util/statetrace/base/tracechild.hh b/util/statetrace/base/tracechild.hh
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+++ b/util/statetrace/base/tracechild.hh
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+/*
+ * Copyright (c) 2006-2007 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef TRACECHILD_HH
+#define TRACECHILD_HH
+
+#include "base/regstate.hh"
+
+class TraceChild : public RegState
+{
+  protected:
+    int pid;
+    uint64_t instructions;
+    bool tracing;
+  public:
+    TraceChild() : tracing(false), instructions(0)
+    {;}
+    virtual bool sendState(int socket) = 0;
+    virtual bool startTracing(const char * pathToFile, char * const argv[]);
+    virtual bool stopTracing();
+    virtual bool step();
+    virtual std::ostream & outputStartState(std::ostream & os) = 0;
+    bool
+    isTracing()
+    {
+        return tracing;
+    }
+  protected:
+    bool ptraceSingleStep();
+    bool doWait();
+};
+
+TraceChild * genTraceChild();
+
+#endif