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/* dmesg.c - display/control kernel ring buffer.
*
* Copyright 2006, 2007 Rob Landley <rob@landley.net>
*
* http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/dmesg.html
USE_DMESG(NEWTOY(dmesg, "s#n#c", TOYFLAG_BIN))
config DMESG
bool "dmesg"
default y
help
usage: dmesg [-n level] [-s bufsize] | -c
Print or control the kernel ring buffer.
-n Set kernel logging level (1-9).
-s Size of buffer to read (in bytes), default 16384.
-c Clear the ring buffer after printing.
*/
#define FOR_dmesg
#include "toys.h"
#include <sys/klog.h>
GLOBALS(
long level;
long size;
)
void dmesg_main(void)
{
// For -n just tell kernel to which messages to keep.
if (toys.optflags & 2) {
if (klogctl(8, NULL, TT.level)) error_exit("klogctl");
} else {
int size, i, last = '\n';
char *data;
// Figure out how much data we need, and fetch it.
size = TT.size;
if (size<2) size = 16384;
data = xmalloc(size);
size = klogctl(3 + (toys.optflags&1), data, size);
if (size < 0) error_exit("klogctl");
// Display data, filtering out level markers.
for (i=0; i<size; ) {
if (last=='\n' && data[i]=='<') i += 3;
else xputc(last = data[i++]);
}
if (last!='\n') xputc('\n');
if (CFG_TOYBOX_FREE) free(data);
}
}
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