Contents of /tags/mkinitrd-6_1_12/busybox/util-linux/dmesg.c
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Tue Nov 17 21:24:51 2009 UTC (14 years, 10 months ago) by niro
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Tue Nov 17 21:24:51 2009 UTC (14 years, 10 months ago) by niro
File MIME type: text/plain
File size: 1441 byte(s)
tagged 'mkinitrd-6_1_12'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * |
4 | * dmesg - display/control kernel ring buffer. |
5 | * |
6 | * Copyright 2006 Rob Landley <rob@landley.net> |
7 | * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at> |
8 | * |
9 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
10 | */ |
11 | |
12 | #include <sys/klog.h> |
13 | #include "libbb.h" |
14 | |
15 | int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
16 | int dmesg_main(int argc UNUSED_PARAM, char **argv) |
17 | { |
18 | int len; |
19 | char *buf; |
20 | char *size, *level; |
21 | unsigned flags = getopt32(argv, "cs:n:", &size, &level); |
22 | enum { |
23 | OPT_c = 1<<0, |
24 | OPT_s = 1<<1, |
25 | OPT_n = 1<<2 |
26 | }; |
27 | |
28 | if (flags & OPT_n) { |
29 | if (klogctl(8, NULL, xatoul_range(level, 0, 10))) |
30 | bb_perror_msg_and_die("klogctl"); |
31 | return EXIT_SUCCESS; |
32 | } |
33 | |
34 | len = (flags & OPT_s) ? xatoul_range(size, 2, INT_MAX) : 16384; |
35 | buf = xmalloc(len); |
36 | len = klogctl(3 + (flags & OPT_c), buf, len); |
37 | if (len < 0) |
38 | bb_perror_msg_and_die("klogctl"); |
39 | if (len == 0) |
40 | return EXIT_SUCCESS; |
41 | |
42 | /* Skip <#> at the start of lines, and make sure we end with a newline. */ |
43 | |
44 | if (ENABLE_FEATURE_DMESG_PRETTY) { |
45 | int last = '\n'; |
46 | int in = 0; |
47 | |
48 | do { |
49 | if (last == '\n' && buf[in] == '<') |
50 | in += 3; |
51 | else { |
52 | last = buf[in++]; |
53 | bb_putchar(last); |
54 | } |
55 | } while (in < len); |
56 | if (last != '\n') |
57 | bb_putchar('\n'); |
58 | } else { |
59 | full_write(STDOUT_FILENO, buf, len); |
60 | if (buf[len-1] != '\n') |
61 | bb_putchar('\n'); |
62 | } |
63 | |
64 | if (ENABLE_FEATURE_CLEAN_UP) free(buf); |
65 | |
66 | return EXIT_SUCCESS; |
67 | } |