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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.
*/
#include "busybox.h"
#include <stdio.h>
#include <stdlib.h>
#if __GNU_LIBRARY__ < 5
#ifndef __alpha__
# define __NR_klogctl __NR_syslog
static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
#else /* __alpha__ */
#define klogctl syslog
#endif
#else
# include <sys/klog.h>
#endif
int dmesg_main(int argc, char **argv)
{
char *buf;
int c;
int bufsize = 8196;
int i;
int n;
int level = 0;
int lastc;
int cmd = 3;
while ((c = getopt(argc, argv, "cn:s:")) != EOF) {
switch (c) {
case 'c':
cmd = 4;
break;
case 'n':
cmd = 8;
if (optarg == NULL)
usage(dmesg_usage);
level = atoi(optarg);
break;
case 's':
if (optarg == NULL)
usage(dmesg_usage);
bufsize = atoi(optarg);
break;
default:
usage(dmesg_usage);
}
}
if (optind < argc) {
goto end;
}
if (cmd == 8) {
n = klogctl(cmd, NULL, level);
if (n < 0) {
goto klogctl_error;
}
return EXIT_SUCCESS;
}
if (bufsize < 4096)
bufsize = 4096;
buf = (char *) xmalloc(bufsize);
n = klogctl(cmd, buf, bufsize);
if (n < 0) {
goto klogctl_error;
}
lastc = '\n';
for (i = 0; i < n; i++) {
if ((i == 0 || buf[i - 1] == '\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');
return EXIT_SUCCESS;
end:
usage(dmesg_usage);
return EXIT_FAILURE;
klogctl_error:
perror("klogctl");
return EXIT_FAILURE;
}
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