source:
MondoRescue/branches/2.2.9/mindi-busybox/util-linux/dmesg.c@
3506
Last change on this file since 3506 was 3320, checked in by , 10 years ago | |
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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 source tree. |
10 | */ |
11 | #include <sys/klog.h> |
12 | #include "libbb.h" |
13 | |
14 | int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
15 | int dmesg_main(int argc UNUSED_PARAM, char **argv) |
16 | { |
17 | int len, level; |
18 | char *buf; |
19 | unsigned opts; |
20 | enum { |
21 | OPT_c = 1 << 0, |
22 | OPT_s = 1 << 1, |
23 | OPT_n = 1 << 2 |
24 | }; |
25 | |
26 | opt_complementary = "s+:n+"; /* numeric */ |
27 | opts = getopt32(argv, "cs:n:", &len, &level); |
28 | if (opts & OPT_n) { |
29 | if (klogctl(8, NULL, (long) level)) |
30 | bb_perror_msg_and_die("klogctl"); |
31 | return EXIT_SUCCESS; |
32 | } |
33 | |
34 | if (!(opts & OPT_s)) |
35 | len = klogctl(10, NULL, 0); /* read ring buffer size */ |
36 | if (len < 16*1024) |
37 | len = 16*1024; |
38 | if (len > 16*1024*1024) |
39 | len = 16*1024*1024; |
40 | |
41 | buf = xmalloc(len); |
42 | len = klogctl(3 + (opts & OPT_c), buf, len); /* read ring buffer */ |
43 | if (len < 0) |
44 | bb_perror_msg_and_die("klogctl"); |
45 | if (len == 0) |
46 | return EXIT_SUCCESS; |
47 | |
48 | |
49 | if (ENABLE_FEATURE_DMESG_PRETTY) { |
50 | int last = '\n'; |
51 | int in = 0; |
52 | |
53 | /* Skip <#> at the start of lines */ |
54 | while (1) { |
55 | if (last == '\n' && buf[in] == '<') { |
56 | in += 3; |
57 | if (in >= len) |
58 | break; |
59 | } |
60 | last = buf[in]; |
61 | putchar(last); |
62 | in++; |
63 | if (in >= len) |
64 | break; |
65 | } |
66 | /* Make sure we end with a newline */ |
67 | if (last != '\n') |
68 | bb_putchar('\n'); |
69 | } else { |
70 | full_write(STDOUT_FILENO, buf, len); |
71 | if (buf[len-1] != '\n') |
72 | bb_putchar('\n'); |
73 | } |
74 | |
75 | if (ENABLE_FEATURE_CLEAN_UP) free(buf); |
76 | |
77 | return EXIT_SUCCESS; |
78 | } |
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