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diff --git a/include/lutil_lockf.h b/include/lutil_lockf.h
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+/* File locking methods
+ *
+ * lutil_lockf() will block until an exclusive lock is acquired.
+ */
+
+#ifndef _LUTIL_LOCKF_H_
+#define _LUTIL_LOCKF_H_
+
+LDAP_BEGIN_DECL
+
+LDAP_LUTIL_F( int )
+lutil_lockf LDAP_P(( int fd ));
+
+LDAP_LUTIL_F( int )
+lutil_unlockf LDAP_P(( int fd ));
+
+LDAP_END_DECL
+
+#endif /* _LUTIL_LOCKF_H_ */