1 /* 2 * Copyright (c) 1989, 1993, 2020 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)gethostid.c 8.1 (Berkeley) 6/2/93 30 * $FreeBSD: src/lib/libc/gen/getosreldate.c,v 1.4 1999/08/27 23:58:43 peter Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/sysctl.h> 35 36 #include <unistd.h> 37 38 static int save_osreldate; 39 40 int 41 getosreldate(void) 42 { 43 int mib[2]; 44 size_t size; 45 int value; 46 47 if (save_osreldate) 48 return save_osreldate; 49 50 mib[0] = CTL_KERN; 51 mib[1] = KERN_OSRELDATE; 52 size = sizeof value; 53 if (sysctl(mib, 2, &value, &size, NULL, 0) == -1) 54 return (-1); 55 save_osreldate = value; 56 57 return (value); 58 } 59