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 <andersen@codepoet.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 <andersen@codepoet.org>
28 int dmesg_main(int argc, char **argv)
35 i = bb_getopt_ulflags(argc, argv, "cn:s:", &buf, &tmp);
40 n = bb_xgetlarg(buf, 10, 0, 10);
43 /* I think a 512k max kernel ring buffer is big enough for
44 * anybody, as the default is 16k... Could be wrong though.
45 * If so I'm sure I'll hear about it by the enraged masses*/
46 bufsize = bb_xgetlarg(tmp, 10, 4096, 512*1024);
49 if (klogctl(c, NULL, n) < 0)
54 buf = xmalloc(bufsize);
55 if ((n = klogctl(c, buf, bufsize)) < 0)
59 for (i = 0; i < n; i++) {
60 if (c == '\n' && buf[i] == '<') {
62 while (buf[i] >= '0' && buf[i] <= '9')
73 if (ENABLE_FEATURE_CLEAN_UP) {
79 bb_perror_nomsg_and_die();