1 files changed, 52 insertions, 0 deletions
diff --git a/lib/isc/include/isc/os.h b/lib/isc/include/isc/os.h
new file mode 100644
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+++ 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.
+ */
+
+#pragma once
+
+/*! \file isc/os.h */
+#include <isc/lang.h>
+#include <isc/types.h>
+
+#include <sys/stat.h>
+
+ISC_LANG_BEGINDECLS
+
+/*%<
+ * Hardcode the L1 cacheline size of the CPU to 64, this is checked in
+ * the os.c library constructor if operating system provide means to
+ * get the L1 cacheline size using sysconf().
+ */
+#define ISC_OS_CACHELINE_SIZE 64
+
+unsigned int
+isc_os_ncpus(void);
+/*%<
+ * Return the number of CPUs available on the system, or 1 if this cannot
+ * be determined.
+ */
+
+unsigned long
+isc_os_cacheline(void);
+/*%<
+ * Return L1 cacheline size of the CPU.
+ * If L1 cache is greater than ISC_OS_CACHELINE_SIZE, ensure it is used
+ * instead of constant. Is common on ppc64le architecture.
+ */
+
+mode_t
+isc_os_umask(void);
+/*%<
+ * Return umask of the current process as initialized at the program start
+ */
+
+ISC_LANG_ENDDECLS