1 /* vi: set sw=4 ts=4: */
4 * dmesg - display/control kernel ring buffer.
6 * Copyright 2006 Rob Landley <rob@landley.net>
7 * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at>
9 * Licensed under GPLv2, see file LICENSE in this source tree.
14 int dmesg_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
15 int dmesg_main(int argc UNUSED_PARAM
, char **argv
)
26 opt_complementary
= "s+:n+"; /* numeric */
27 opts
= getopt32(argv
, "cs:n:", &len
, &level
);
29 if (klogctl(8, NULL
, (long) level
))
30 bb_perror_msg_and_die("klogctl");
35 len
= klogctl(10, NULL
, 0); /* read ring buffer size */
38 if (len
> 16*1024*1024)
42 len
= klogctl(3 + (opts
& OPT_c
), buf
, len
); /* read ring buffer */
44 bb_perror_msg_and_die("klogctl");
49 if (ENABLE_FEATURE_DMESG_PRETTY
) {
53 /* Skip <#> at the start of lines */
55 if (last
== '\n' && buf
[in
] == '<') {
66 /* Make sure we end with a newline */
70 full_write(STDOUT_FILENO
, buf
, len
);
71 if (buf
[len
-1] != '\n')
75 if (ENABLE_FEATURE_CLEAN_UP
) free(buf
);