1/*
2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
7 * Reserved.  This file contains Original Code and/or Modifications of
8 * Original Code as defined in and that are subject to the Apple Public
9 * Source License Version 1.0 (the 'License').  You may not use this file
10 * except in compliance with the License.  Please obtain a copy of the
11 * License at http://www.apple.com/publicsource and read it before using
12 * this file.
13 *
14 * The Original Code and all software distributed under the License are
15 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
19 * License for the specific language governing rights and limitations
20 * under the License."
21 *
22 * @APPLE_LICENSE_HEADER_END@
23 */
24/*-
25 * Copyright (c) 1991, 1993
26 *      The Regents of the University of California.  All rights reserved.
27 *
28 * Redistribution and use in source and binary forms, with or without
29 * modification, are permitted provided that the following conditions
30 * are met:
31 * 1. Redistributions of source code must retain the above copyright
32 *    notice, this list of conditions and the following disclaimer.
33 * 2. Redistributions in binary form must reproduce the above copyright
34 *    notice, this list of conditions and the following disclaimer in the
35 *    documentation and/or other materials provided with the distribution.
36 * 3. All advertising materials mentioning features or use of this software
37 *    must display the following acknowledgement:
38 *      This product includes software developed by the University of
39 *      California, Berkeley and its contributors.
40 * 4. Neither the name of the University nor the names of its contributors
41 *    may be used to endorse or promote products derived from this software
42 *    without specific prior written permission.
43 *
44 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54 * SUCH DAMAGE.
55 */
56
57#include <stdio.h>
58#include <stdlib.h>
59#include <vis.h>
60#include <sys/sysctl.h>
61#include <libproc.h>
62
63void
64usage() {
65	(void)fprintf(stderr, "usage: sudo dmesg\n");
66	exit(1);
67}
68
69int
70main(int argc, char **argv) {
71	char *msgbuf, *visbuf;
72	int msgbufsize;
73	size_t sysctlsize = sizeof(msgbufsize);
74	long data_size;
75
76	if (argc > 1)
77		usage();
78
79	if (sysctlbyname("kern.msgbuf", &msgbufsize, &sysctlsize, NULL, 0)) {
80		perror("Unable to size kernel buffer");
81	}
82
83	msgbuf = malloc(msgbufsize);
84	if (msgbuf == NULL) {
85		perror("Unable to allocate a message buffer");
86	}
87
88	if ((data_size = proc_kmsgbuf(msgbuf, msgbufsize)) == 0){
89		perror("Unable to obtain kernel buffer");
90		usage();
91	}
92
93	visbuf = malloc(data_size*4);
94	strvis(visbuf, msgbuf, 0);
95	printf("%s", visbuf);
96	free(visbuf);
97	free(msgbuf);
98	exit(0);
99}
100
101