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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | /* 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 <linux/unistd.h>
#include <stdio.h>
#include <getopt.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
static const char dmesg_usage[] = "dmesg [-c] [-n level] [-s bufsize]\n";
int dmesg_main( int argc, char** argv )
{
char *buf;
int bufsize=8196;
int i;
int n;
int level = 0;
int lastc;
int cmd = 3;
/* Parse any options */
while (argc && **argv == '-') {
while (*++(*argv))
switch (**argv) {
case 'c':
cmd = 4;
break;
case 'n':
cmd = 8;
if (--argc == 0)
goto end;
level = atoi (*(++argv));
--argc;
++argv;
break;
case 's':
if (--argc == 0)
goto end;
bufsize = atoi (*(++argv));
--argc;
++argv;
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*)malloc(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" );
exit( FALSE );
}
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