1 /* vi: set sw=4 ts=4: */
2 /* dmesg.c -- Print out the contents of the kernel ring buffer
3 * Created: Sat Oct 9 16:19:47 1993
4 * Revised: Thu Oct 28 21:52:17 1993 by faith@cs.unc.edu
5 * Copyright 1993 Theodore Ts'o (tytso@athena.mit.edu)
6 * This program comes with ABSOLUTELY NO WARRANTY.
7 * Modifications by Rick Sladkey (jrs@world.std.com)
8 * Larger buffersize 3 June 1998 by Nicolai Langfeldt, based on a patch
9 * by Peeter Joot. This was also suggested by John Hudson.
10 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
11 * - added Native Language Support
13 * from util-linux -- adapted for busybox by
14 * Erik Andersen <andersee@debian.org>. I ripped out Native Language
15 * Support, replaced getopt, added some gotos for redundant stuff.
17 * Audited and cleaned up on 7 March 2003 to reduce size of
18 * check error handling by Erik Andersen <andersee@debian.org>
26 #if __GNU_LIBRARY__ < 5
28 # define klogctl syslog
31 # include <sys/klog.h>
36 int dmesg_main(int argc, char **argv)
45 while ((i = getopt(argc, argv, "cn:s:")) > 0) {
52 level = bb_xgetlarg(optarg, 10, 0, 10);
55 /* I think a 512k max kernel ring buffer is big enough for
56 * anybody, as the default is 16k... Could be wrong though.
57 * If so I'm sure I'll hear about it by the enraged masses*/
58 bufsize = bb_xgetlarg(optarg, 10, 4096, 512*1024);
70 if (klogctl(cmd, NULL, level) < 0)
75 buf = xmalloc(bufsize);
76 if ((n = klogctl(cmd, buf, bufsize)) < 0)
80 for (i = 0; i < n; i++) {
81 if (lastc == '\n' && buf[i] == '<') {
83 while (buf[i] >= '0' && buf[i] <= '9')
94 #ifdef CONFIG_FEATURE_CLEAN_UP
101 bb_perror_nomsg_and_die();