annotate toys/lsb/dmesg.c @ 1008:a55854bde872

su: cleanery * make help message more like others * s/TT\.(.)Argu/TT.\1/g * move environ to toys.h * simplify failure messages * clear password before quit * not check what execve returns * -lc
author Strake <strake888@gmail.com>
date Sat, 17 Aug 2013 02:54:58 -0500
parents 786841fdb1e0
children d26f235323db
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1 /* dmesg.c - display/control kernel ring buffer.
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2 *
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3 * Copyright 2006, 2007 Rob Landley <rob@landley.net>
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4 *
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5 * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/dmesg.html
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6
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7 USE_DMESG(NEWTOY(dmesg, "s#n#c", TOYFLAG_BIN))
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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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15 Print or control the kernel ring buffer.
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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 */
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22 #define FOR_dmesg
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23 #include "toys.h"
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24 #include <sys/klog.h>
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26 GLOBALS(
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27 long level;
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28 long size;
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29 )
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30
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31 void dmesg_main(void)
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32 {
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33 // For -n just tell kernel to which messages to keep.
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34 if (toys.optflags & 2) {
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35 if (klogctl(8, NULL, TT.level)) error_exit("klogctl");
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36 } else {
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37 int size, i, last = '\n';
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38 char *data;
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40 // Figure out how much data we need, and fetch it.
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41 size = TT.size;
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42 if (size<2) size = 16384;
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43 data = xmalloc(size);
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44 size = klogctl(3 + (toys.optflags&1), data, size);
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45 if (size < 0) error_exit("klogctl");
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47 // Display data, filtering out level markers.
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48 for (i=0; i<size; ) {
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49 if (last=='\n' && data[i]=='<') i += 3;
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50 else xputc(last = data[i++]);
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51 }
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52 if (last!='\n') xputc('\n');
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53 if (CFG_TOYBOX_FREE) free(data);
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54 }
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55 }