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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.
*/
#include <isc/os.h>
#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) */
unsigned int
isc_os_ncpus(void) {
long ncpus = 0;
#if defined(HAVE_SYSCONF)
ncpus = sysconf_ncpus();
#endif /* if defined(HAVE_SYSCONF) */
#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
if (ncpus <= 0) {
ncpus = sysctl_ncpus();
}
#endif /* if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME) */
if (ncpus <= 0) {
ncpus = 1;
}
return ((unsigned int)ncpus);
}
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