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/* 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@pld.ORG.PL>
* - added Native Language Support
*
*/
/*
* Commands to sys_syslog:
*
* 0 -- Close the log. Currently a NOP.
* 1 -- Open the log. Currently a NOP.
* 2 -- Read from the log.
* 3 -- Read all messages remaining in the ring buffer.
* 4 -- Read and clear all messages remaining in the ring buffer
* 5 -- Clear ring buffer.
* 6 -- Disable printk's to console
* 7 -- Enable printk's to console
* 8 -- Set level of messages printed to console
* 9 -- Return number of unread characters in the log buffer
* [supported since 2.4.10]
*
* Only function 3 is allowed to non-root processes.
*/
#include <linux/unistd.h>
#include <stdio.h>
#include <getopt.h>
#include <stdlib.h>
#include <sys/klog.h>
#include "nls.h"
#include "strutils.h"
static char *progname;
static void
usage(void) {
fprintf(stderr,
_("Usage: %s [-c] [-n level] [-r] [-s bufsize]\n"), progname);
}
int
main(int argc, char *argv[]) {
char *buf;
int sz;
int bufsize = 0;
int i;
int n;
int c;
int level = 0;
int lastc;
int cmd = 3; /* Read all messages in the ring buffer */
int raw = 0;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
progname = argv[0];
while ((c = getopt(argc, argv, "crn:s:")) != -1) {
switch (c) {
case 'c':
cmd = 4; /* Read and clear all messages */
break;
case 'n':
cmd = 8; /* Set level of messages */
level = strtol_or_err(optarg, _("failed to parse level"));
break;
case 'r':
raw = 1;
break;
case 's':
bufsize = strtol_or_err(optarg, _("failed to parse buffer size"));
if (bufsize < 4096)
bufsize = 4096;
break;
case '?':
default:
usage();
exit(EXIT_FAILURE);
}
}
argc -= optind;
argv += optind;
if (argc > 1) {
usage();
exit(EXIT_FAILURE);
}
if (cmd == 8) {
n = klogctl(cmd, NULL, level);
if (n < 0) {
perror("klogctl");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
if (!bufsize) {
n = klogctl(10, NULL, 0); /* read ringbuffer size */
if (n > 0)
bufsize = n;
}
if (bufsize) {
sz = bufsize + 8;
buf = (char *) malloc(sz * sizeof(char));
n = klogctl(cmd, buf, sz);
} else {
sz = 16392;
while (1) {
buf = (char *) malloc(sz * sizeof(char));
n = klogctl(3, buf, sz); /* read only */
if (n != sz || sz > (1<<28))
break;
free(buf);
sz *= 4;
}
if (n > 0 && cmd == 4)
n = klogctl(cmd, buf, sz); /* read and clear */
}
if (n < 0) {
perror("klogctl");
exit(EXIT_FAILURE);
}
lastc = '\n';
for (i = 0; i < n; i++) {
if (!raw && (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');
free(buf);
return 0;
}
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