1 files changed, 113 insertions, 0 deletions
diff --git a/lib/isc/os.c b/lib/isc/os.c
new file mode 100644
index 0000000..0ba0fab
--- /dev/null
+++ b/lib/isc/os.c
@@ -0,0 +1,113 @@
+/*
+ * 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.
+ */
+
+#include <inttypes.h>
+#include <sys/stat.h>
+
+#include <isc/os.h>
+#include <isc/types.h>
+#include <isc/util.h>
+
+#include "os_p.h"
+
+static unsigned int isc__os_ncpus = 0;
+static unsigned long isc__os_cacheline = ISC_OS_CACHELINE_SIZE;
+static mode_t isc__os_umask = 0;
+
+#ifdef HAVE_SYSCONF
+
+#include <unistd.h>
+
+static long
+sysconf_ncpus(void) {
+#if defined(_SC_NPROCESSORS_ONLN)
+	return (sysconf((_SC_NPROCESSORS_ONLN)));
+#elif defined(_SC_NPROC_ONLN)
+	return (sysconf((_SC_NPROC_ONLN)));
+#else  /* if defined(_SC_NPROCESSORS_ONLN) */
+	return (0);
+#endif /* if defined(_SC_NPROCESSORS_ONLN) */
+}
+#endif /* HAVE_SYSCONF */
+
+#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
+#include <sys/param.h> /* for NetBSD */
+#include <sys/sysctl.h>
+#include <sys/types.h> /* for FreeBSD */
+
+static int
+sysctl_ncpus(void) {
+	int ncpu, result;
+	size_t len;
+
+	len = sizeof(ncpu);
+	result = sysctlbyname("hw.ncpu", &ncpu, &len, 0, 0);
+	if (result != -1) {
+		return (ncpu);
+	}
+	return (0);
+}
+#endif /* if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME) */
+
+static void
+ncpus_initialize(void) {
+#if defined(HAVE_SYSCONF)
+	isc__os_ncpus = sysconf_ncpus();
+#endif /* if defined(HAVE_SYSCONF) */
+#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
+	if (isc__os_ncpus <= 0) {
+		isc__os_ncpus = sysctl_ncpus();
+	}
+#endif /* if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME) */
+	if (isc__os_ncpus == 0) {
+		isc__os_ncpus = 1;
+	}
+}
+
+static void
+umask_initialize(void) {
+	isc__os_umask = umask(0);
+	(void)umask(isc__os_umask);
+}
+
+unsigned int
+isc_os_ncpus(void) {
+	return (isc__os_ncpus);
+}
+
+unsigned long
+isc_os_cacheline(void) {
+	return (isc__os_cacheline);
+}
+
+mode_t
+isc_os_umask(void) {
+	return (isc__os_umask);
+}
+
+void
+isc__os_initialize(void) {
+	umask_initialize();
+	ncpus_initialize();
+#if defined(HAVE_SYSCONF) && defined(_SC_LEVEL1_DCACHE_LINESIZE)
+	long s = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
+	if (s > 0 && (unsigned long)s > isc__os_cacheline) {
+		isc__os_cacheline = s;
+	}
+#endif
+}
+
+void
+isc__os_shutdown(void) {
+	/* empty, but defined for completeness */;
+}