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diff --git a/libipt/internal/include/pt_sync.h b/libipt/internal/include/pt_sync.h
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+++ b/libipt/internal/include/pt_sync.h
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+/*
+ * Copyright (c) 2014-2019, Intel Corporation
+ *
+ * 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 Intel Corporation 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.
+ */
+
+#ifndef PT_SYNC_H
+#define PT_SYNC_H
+
+#include <stdint.h>
+
+struct pt_config;
+
+
+/* Synchronize onto the trace stream.
+ *
+ * Search for the next synchronization point in forward or backward direction
+ * starting at @pos using the trace configuration @config.
+ *
+ * On success, stores a pointer to the next synchronization point in @sync.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ *
+ * Returns -pte_internal if @sync, @pos, or @config is NULL.
+ * Returns -pte_nosync if @pos lies outside of @config's buffer.
+ * Returns -pte_eos if no further synchronization point is found.
+ */
+extern int pt_sync_forward(const uint8_t **sync, const uint8_t *pos,
+			   const struct pt_config *config);
+extern int pt_sync_backward(const uint8_t **sync, const uint8_t *pos,
+			    const struct pt_config *config);
+
+/* Manually synchronize onto the trace stream.
+ *
+ * Validate that @pos is within the bounds of @config's trace buffer and that
+ * there is a synchronization point at @pos.
+ *
+ * On success, stores @pos in @sync.
+ *
+ * Returns zero on success, a negative error code otherwise.
+ *
+ * Returns -pte_eos if @pos is outside of @config's trace buffer.
+ * Returns -pte_internal if @sync, @pos, or @config is NULL.
+ * Returns -pte_bad_packet if there is no PSB at @pos.
+ */
+extern int pt_sync_set(const uint8_t **sync, const uint8_t *pos,
+		       const struct pt_config *config);
+
+#endif /* PT_SYNC_H */