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diff --git a/test/packetdrill/logging.h b/test/packetdrill/logging.h
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+/*
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+/*
+ * Author: ncardwell@google.com (Neal Cardwell)
+ *
+ * Logging and output functions.
+ */
+
+#ifndef __LOGGING_H__
+#define __LOGGING_H__
+
+#include "types.h"
+
+/* Enable this to get debug logging. */
+#define DEBUG_LOGGING 0
+
+/* Use a gcc variadic macro to conditionally compile debug printing. */
+#define DEBUGP(...) \
+ if (DEBUG_LOGGING) { \
+ fprintf(stdout, __VA_ARGS__); \
+ fflush(stdout); \
+ }
+
+/* Log the message to stderr and then exit with a failure status code. */
+extern void __attribute__((noreturn)) die(char *format, ...);
+
+/* Call perror() with message and then exit with a failure status code. */
+extern void __attribute__((noreturn)) die_perror(char *message);
+
+#endif /* __LOGGING_H__ */