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diff --git a/lib/isc/include/isc/os.h b/lib/isc/include/isc/os.h
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#ifndef ISC_OS_H
+#define ISC_OS_H 1
+
+/*! \file isc/os.h */
+
+#include <isc/lang.h>
+
+ISC_LANG_BEGINDECLS
+
+unsigned int
+isc_os_ncpus(void);
+/*%<
+ * Return the number of CPUs available on the system, or 1 if this cannot
+ * be determined.
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_OS_H */