1 /*-
2  * Copyright (c) 1998 Andrzej Bialecki <[email protected]>
3  * 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  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  */
28 
29 /*
30  * Small replacement for 'dmesg'. It doesn't need libkvm nor /dev/kmem.
31  */
32 
33 
34 #include <stdio.h>
35 #include <sys/types.h>
36 #include <sys/sysctl.h>
37 
38 int
39 main(int argc, char *argv[])
40 {
41 	int len,i;
42 	char *buf,*p;
43 	char *mib="kern.msgbuf";
44 
45 	/* We use sysctlbyname, because the oid is unknown (OID_AUTO) */
46 
47 	/* get the buffer size */
48 	i=sysctlbyname(mib,NULL,&len,NULL,NULL);
49 	if(i) {
50 		perror("buffer sizing");
51 		exit(-1);
52 	}
53 	buf=(char *)malloc(len*sizeof(char));
54 	i=sysctlbyname(mib,buf,&len,NULL,NULL);
55 	if(i) {
56 		perror("retrieving data");
57 		exit(-1);
58 	}
59 	p=buf;
60 	i=0;
61 	while(p<(buf+len)) {
62 		switch(*p) {
63 		case '\0':
64 			/* skip initial NULLs */
65 			break;
66 		default:
67 			putchar(*p);
68 		}
69 		p++;
70 	}
71 	if(*--p!='\n') putchar('\n');
72 	free(buf);
73 	exit(0);
74 }
75