/* 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.
*/
#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 char *progname;
void
usage()
{
fprintf( stderr, "Usage: %s [-c] [-n level] [-s bufsize]\n", progname );
}
int main( int argc, char *argv[] )
{
char *buf;
int bufsize=8196;
int i;
int n;
int c;
int level = 0;
int lastc;
int cmd = 3;
progname = argv[0];
while ((c = getopt( argc, argv, "cn:s:" )) != EOF) {
switch (c) {
case 'c':
cmd = 4;
break;
case 'n':
cmd = 8;
level = atoi(optarg);
break;
case 's':
bufsize = atoi(optarg);
break;
case '?':
default:
usage();
exit(1);
}
}
argc -= optind;
argv += optind;
if (argc > 1) {
usage();
exit(1);
}
if (cmd == 8) {
n = klogctl( cmd, NULL, level );
if (n < 0) {
perror( "klogctl" );
exit( 1 );
}
exit( 0 );
}
if (bufsize < 4096) bufsize = 4096;
buf = (char*)malloc(bufsize);
n = klogctl( cmd, buf, bufsize );
if (n < 0) {
perror( "klogctl" );
exit( 1 );
}
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 0;
}
