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/* vi: set sw=4 ts=4: */
/*
*
* dmesg - display/control kernel ring buffer.
*
* Copyright 2006 Rob Landley <rob@landley.net>
* Copyright 2006 Bernhard Fischer <rep.nop@aon.at>
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include <sys/klog.h>
#include "libbb.h"
int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dmesg_main(int argc UNUSED_PARAM, char **argv)
{
int len;
char *buf;
char *size, *level;
unsigned flags = getopt32(argv, "cs:n:", &size, &level);
enum {
OPT_c = 1<<0,
OPT_s = 1<<1,
OPT_n = 1<<2
};
if (flags & OPT_n) {
if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
bb_perror_msg_and_die("klogctl");
return EXIT_SUCCESS;
}
len = (flags & OPT_s) ? xatoul_range(size, 2, INT_MAX) : 16384;
buf = xmalloc(len);
len = klogctl(3 + (flags & OPT_c), buf, len);
if (len < 0)
bb_perror_msg_and_die("klogctl");
if (len == 0)
return EXIT_SUCCESS;
/* Skip <#> at the start of lines, and make sure we end with a newline. */
if (ENABLE_FEATURE_DMESG_PRETTY) {
int last = '\n';
int in = 0;
do {
if (last == '\n' && buf[in] == '<')
in += 3;
else {
last = buf[in++];
bb_putchar(last);
}
} while (in < len);
if (last != '\n')
bb_putchar('\n');
} else {
full_write(STDOUT_FILENO, buf, len);
if (buf[len-1] != '\n')
bb_putchar('\n');
}
if (ENABLE_FEATURE_CLEAN_UP) free(buf);
return EXIT_SUCCESS;
}
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