Mercurial > hg > toybox
annotate toys/dmesg.c @ 233:d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
toys/*.c. Move relevant info into comment at the top of each toys/*.c. Also
convert more of Makefile into a thin wrapper around shell scripts that actually
do the work. (Makefile is only still there for the user interface.)
author | Rob Landley <rob@landley.net> |
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date | Sat, 19 Jan 2008 17:08:39 -0600 |
parents | 30a6db5a95c2 |
children | 163498bf547b |
rev | line source |
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1 /* vi: set sw=4 ts=4: |
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2 * |
169 | 3 * dmesg.c - display/control kernel ring buffer. |
4 * | |
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Add comments about SUSv3 specs (or lack thereof).
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5 * Copyright 2006, 2007 Rob Landley <rob@landley.net> |
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Add comments about SUSv3 specs (or lack thereof).
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6 * |
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7 * Not in SUSv3. |
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8 |
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9 config DMESG |
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10 bool "dmesg" |
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11 default y |
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12 help |
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13 usage: dmesg [-n level] [-s bufsize] | -c |
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14 |
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15 Print or control the kernel ring buffer. |
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16 |
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17 -n Set kernel logging level (1-9). |
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18 -s Size of buffer to read (in bytes), default 16384. |
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19 -c Clear the ring buffer after printing. |
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20 */ |
169 | 21 |
22 #include "toys.h" | |
23 #include <sys/klog.h> | |
24 | |
25 #define TT toy.dmesg | |
26 | |
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27 void dmesg_main(void) |
169 | 28 { |
29 // For -n just tell kernel to which messages to keep. | |
30 if (toys.optflags & 2) { | |
31 if (klogctl(8, NULL, TT.level)) | |
32 error_exit("klogctl"); | |
33 } else { | |
34 int size, i, last = '\n'; | |
35 char *data; | |
36 | |
37 // Figure out how much data we need, and fetch it. | |
38 size = TT.size; | |
39 if (size<2) size = 16384; | |
40 data = xmalloc(size); | |
41 size = klogctl(3 + (toys.optflags&1), data, size); | |
42 if (size < 0) error_exit("klogctl"); | |
43 | |
44 // Display data, filtering out level markers. | |
45 for (i=0; i<size; ) { | |
46 if (last=='\n' && data[i]=='<') i += 3; | |
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47 else xputc(last = data[i++]); |
169 | 48 } |
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49 if (last!='\n') xputc('\n'); |
169 | 50 if (CFG_TOYBOX_FREE) free(data); |
51 } | |
52 } |