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annotate toys/dmesg.c @ 562:4d802d438983

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Match uint64_t with PRIu64 to avoid warnings on 64 bit builds.
author Rob Landley <rob@landley.net>
date Sat, 14 Apr 2012 21:27:00 -0500
parents 7cb15eae1664
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * dmesg.c - display/control kernel ring buffer.
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4 *
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30a6db5a95c2 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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6 *
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7 * Not in SUSv3.
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8
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163498bf547b Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
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9 USE_DMESG(NEWTOY(dmesg, "s#n#c", TOYFLAG_BIN))
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10
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11 config DMESG
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12 bool "dmesg"
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13 default y
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14 help
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15 usage: dmesg [-n level] [-s bufsize] | -c
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16
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17 Print or control the kernel ring buffer.
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18
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19 -n Set kernel logging level (1-9).
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20 -s Size of buffer to read (in bytes), default 16384.
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21 -c Clear the ring buffer after printing.
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22 */
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23
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24 #include "toys.h"
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25 #include <sys/klog.h>
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26
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27 DEFINE_GLOBALS(
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28 long level;
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29 long size;
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30 )
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31
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32 #define TT this.dmesg
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33
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34 void dmesg_main(void)
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35 {
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36 // For -n just tell kernel to which messages to keep.
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37 if (toys.optflags & 2) {
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38 if (klogctl(8, NULL, TT.level))
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39 error_exit("klogctl");
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40 } else {
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41 int size, i, last = '\n';
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42 char *data;
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43
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44 // Figure out how much data we need, and fetch it.
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45 size = TT.size;
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46 if (size<2) size = 16384;
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47 data = xmalloc(size);
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48 size = klogctl(3 + (toys.optflags&1), data, size);
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49 if (size < 0) error_exit("klogctl");
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50
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51 // Display data, filtering out level markers.
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52 for (i=0; i<size; ) {
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53 if (last=='\n' && data[i]=='<') i += 3;
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54 else xputc(last = data[i++]);
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55 }
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56 if (last!='\n') xputc('\n');
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57 if (CFG_TOYBOX_FREE) free(data);
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58 }
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59 }