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diff --git a/trace_event.h b/trace_event.h
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+/*
+ * Copyright (c) 2017 The strace developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#ifndef STRACE_TRACE_EVENT_H
+#define STRACE_TRACE_EVENT_H
+
+/* Possible trace event loop states. Returned by next_event() and dispatched by
+ * dispatch_event(). */
+enum trace_event {
+	/* Break the main loop. */
+	TE_BREAK,
+
+	/* Call next_event() again. */
+	TE_NEXT,
+
+	/* Restart the tracee with signal 0 and call next_event() again. */
+	TE_RESTART,
+
+	/*
+	 * For all the events below, current_tcp is set to current tracee's
+	 * tcb.  All the suggested actions imply that you want to continue
+	 * tracing of the current tracee; alternatively, you can detach it.
+	 */
+
+	/*
+	 * Syscall entry or exit.
+	 * Restart the tracee with signal 0, or with an injected signal number.
+	 */
+	TE_SYSCALL_STOP,
+
+	/*
+	 * Tracee received signal with number WSTOPSIG(*pstatus); signal info
+	 * is written to *si.  Restart the tracee (with that signal number
+	 * if you want to deliver it).
+	 */
+	TE_SIGNAL_DELIVERY_STOP,
+
+	/*
+	 * Tracee was killed by a signal with number WTERMSIG(*pstatus).
+	 */
+	TE_SIGNALLED,
+
+	/*
+	 * Tracee was stopped by a signal with number WSTOPSIG(*pstatus).
+	 * Restart the tracee with that signal number.
+	 */
+	TE_GROUP_STOP,
+
+	/*
+	 * Tracee exited with status WEXITSTATUS(*pstatus).
+	 */
+	TE_EXITED,
+
+	/*
+	 * Tracee is going to perform execve().
+	 * Restart the tracee with signal 0.
+	 */
+	TE_STOP_BEFORE_EXECVE,
+
+	/*
+	 * Tracee is going to terminate.
+	 * Restart the tracee with signal 0.
+	 */
+	TE_STOP_BEFORE_EXIT,
+};
+
+#endif /* !STRACE_TRACE_EVENT_H */