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/* vi: set sw=4 ts=4: */
/* dmesg.c -- Print out the contents of the kernel ring buffer
* Created: Sat Oct 9 16:19:47 1993
* Revised: Thu Oct 28 21:52:17 1993 by faith@cs.unc.edu
* Copyright 1993 Theodore Ts'o (tytso@athena.mit.edu)
* This program comes with ABSOLUTELY NO WARRANTY.
* Modifications by Rick Sladkey (jrs@world.std.com)
* Larger buffersize 3 June 1998 by Nicolai Langfeldt, based on a patch
* by Peeter Joot. This was also suggested by John Hudson.
* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
* - added Native Language Support
*
* from util-linux -- adapted for busybox by
* Erik Andersen <andersee@debian.org>. I ripped out Native Language
* Support, replaced getopt, added some gotos for redundant stuff.
*
* Audited and cleaned up on 7 March 2003 to reduce size of
* check error handling by Erik Andersen <andersee@debian.org>
*/
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <errno.h>
#if __GNU_LIBRARY__ < 5
# ifdef __alpha__
# define klogctl syslog
# endif
#else
# include <sys/klog.h>
#endif
#include "busybox.h"
int dmesg_main(int argc, char **argv)
{
char *buf;
int bufsize = 8196;
int i, n;
int level = 0;
int lastc;
int cmd = 3;
while ((i = getopt(argc, argv, "cn:s:")) > 0) {
switch (i) {
case 'c':
cmd = 4;
break;
case 'n':
cmd = 8;
level = bb_xgetlarg(optarg, 10, 0, 10);
break;
case 's':
/* I think a 512k max kernel ring buffer is big enough for
* anybody, as the default is 16k... Could be wrong though.
* If so I'm sure I'll hear about it by the enraged masses*/
bufsize = bb_xgetlarg(optarg, 10, 4096, 512*1024);
break;
default:
bb_show_usage();
}
}
if (optind < argc) {
bb_show_usage();
}
if (cmd == 8) {
if (klogctl(cmd, NULL, level) < 0)
goto die_the_death;
goto all_done;
}
buf = xmalloc(bufsize);
if ((n = klogctl(cmd, buf, bufsize)) < 0)
goto die_the_death;
lastc = '\n';
for (i = 0; i < n; i++) {
if (lastc == '\n' && buf[i] == '<') {
i++;
while (buf[i] >= '0' && buf[i] <= '9')
i++;
if (buf[i] == '>')
i++;
}
lastc = buf[i];
putchar(lastc);
}
if (lastc != '\n')
putchar('\n');
all_done:
#ifdef CONFIG_FEATURE_CLEAN_UP
if (buf) {
free(buf);
}
#endif
return EXIT_SUCCESS;
die_the_death:
bb_perror_nomsg_and_die();
}
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