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 tarball for details.
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");
48 /* Skip <#> at the start of lines, and make sure we end with a newline */
50 if (ENABLE_FEATURE_DMESG_PRETTY) {
55 if (last == '\n' && buf[in] == '<')
65 full_write(STDOUT_FILENO, buf, len);
66 if (buf[len-1] != '\n')
70 if (ENABLE_FEATURE_CLEAN_UP) free(buf);