133 lines
2.7 KiB
C
133 lines
2.7 KiB
C
/* 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 "internal.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#if __GNU_LIBRARY__ < 5
|
|
|
|
#ifndef __alpha__
|
|
# define __NR_klogctl __NR_syslog
|
|
#include <linux/unistd.h>
|
|
static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
|
|
#else /* __alpha__ */
|
|
#define klogctl syslog
|
|
#endif
|
|
|
|
#else
|
|
# include <sys/klog.h>
|
|
#endif
|
|
|
|
static const char dmesg_usage[] = "dmesg [-c] [-n LEVEL] [-s SIZE]\n"
|
|
#ifndef BB_FEATURE_TRIVIAL_HELP
|
|
"\nPrints or controls the kernel ring buffer\n\n"
|
|
"Options:\n"
|
|
"\t-c\t\tClears the ring buffer's contents after printing\n"
|
|
"\t-n LEVEL\tSets console logging level\n"
|
|
"\t-s SIZE\t\tUse a buffer of size SIZE\n"
|
|
#endif
|
|
;
|
|
|
|
int dmesg_main(int argc, char **argv)
|
|
{
|
|
char *buf;
|
|
int bufsize = 8196;
|
|
int i;
|
|
int n;
|
|
int level = 0;
|
|
int lastc;
|
|
int cmd = 3;
|
|
int stopDoingThat;
|
|
|
|
argc--;
|
|
argv++;
|
|
|
|
/* Parse any options */
|
|
while (argc && **argv == '-') {
|
|
stopDoingThat = FALSE;
|
|
while (stopDoingThat == FALSE && *++(*argv)) {
|
|
switch (**argv) {
|
|
case 'c':
|
|
cmd = 4;
|
|
break;
|
|
case 'n':
|
|
cmd = 8;
|
|
if (--argc == 0)
|
|
goto end;
|
|
level = atoi(*(++argv));
|
|
if (--argc > 0)
|
|
++argv;
|
|
stopDoingThat = TRUE;
|
|
break;
|
|
case 's':
|
|
if (--argc == 0)
|
|
goto end;
|
|
bufsize = atoi(*(++argv));
|
|
if (--argc > 0)
|
|
++argv;
|
|
stopDoingThat = TRUE;
|
|
break;
|
|
default:
|
|
goto end;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (argc > 1) {
|
|
goto end;
|
|
}
|
|
|
|
if (cmd == 8) {
|
|
n = klogctl(cmd, NULL, level);
|
|
if (n < 0) {
|
|
goto klogctl_error;
|
|
}
|
|
exit(TRUE);
|
|
}
|
|
|
|
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');
|
|
exit(TRUE);
|
|
end:
|
|
usage(dmesg_usage);
|
|
exit(FALSE);
|
|
klogctl_error:
|
|
perror("klogctl");
|
|
return(FALSE);
|
|
}
|