usr/src/lib/libc/port/gen/gethostid.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*      All Rights Reserved     */
  29
  30 /*
  31  * Portions of this source code were derived from Berkeley 4.3 BSD
  32  * under license from the Regents of the University of California.
  33  */
  34
  35 #include "lint.h"
  36 #include <sys/types.h>
  37 #include <sys/systeminfo.h>
  38 #include <stdlib.h>
  39
  40 long
  41 gethostid(void)
  42 {
  43         char name[HW_HOSTID_LEN], *end;
  44         unsigned long hostid;
  45
  46         /*
  47          * HW_INVALID_HOSTID must be cast to an int to ensure that it's sign
  48          * extended to 64 bits in 64-bit builds.
  49          */
  50         if (sysinfo(SI_HW_SERIAL, name, sizeof (name)) == -1)
  51                 return ((int)HW_INVALID_HOSTID);
  52         hostid = strtoul(name, &end, 10);
  53         if (end == name)
  54                 return ((int)HW_INVALID_HOSTID);
  55         return ((long)hostid);
  56 }