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      1 /*	$NetBSD: os.h,v 1.8 2026/04/08 00:16:16 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
      5  *
      6  * SPDX-License-Identifier: MPL-2.0
      7  *
      8  * This Source Code Form is subject to the terms of the Mozilla Public
      9  * License, v. 2.0. If a copy of the MPL was not distributed with this
     10  * file, you can obtain one at https://mozilla.org/MPL/2.0/.
     11  *
     12  * See the COPYRIGHT file distributed with this work for additional
     13  * information regarding copyright ownership.
     14  */
     15 
     16 #pragma once
     17 
     18 /*! \file isc/os.h */
     19 #include <sys/stat.h>
     20 
     21 #include <isc/lang.h>
     22 #include <isc/types.h>
     23 
     24 ISC_LANG_BEGINDECLS
     25 
     26 /*%<
     27  * Hardcode the L1 cacheline size of the CPU to 64, this is checked in
     28  * the os.c library constructor if operating system provide means to
     29  * get the L1 cacheline size using sysconf().
     30  */
     31 #define ISC_OS_CACHELINE_SIZE 64
     32 
     33 unsigned int
     34 isc_os_ncpus(void);
     35 /*%<
     36  * Return the number of CPUs available on the system, or 1 if this cannot
     37  * be determined.
     38  */
     39 
     40 unsigned long
     41 isc_os_cacheline(void);
     42 /*%<
     43  * Return L1 cacheline size of the CPU.
     44  * If L1 cache is greater than ISC_OS_CACHELINE_SIZE, ensure it is used
     45  * instead of constant. Is common on ppc64le architecture.
     46  */
     47 
     48 mode_t
     49 isc_os_umask(void);
     50 /*%<
     51  * Return umask of the current process as initialized at the program start
     52  */
     53 
     54 void
     55 isc_os_kernel(char **name, int *major, int *minor, int *patch);
     56 /*%<
     57  * Fill the running kernel version into major, minor and patch.
     58  * If any of these are not available then -1 is returned.
     59  */
     60 
     61 ISC_LANG_ENDDECLS
     62