1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | *
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4 | * dmesg - display/control kernel ring buffer.
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5 | *
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6 | * Copyright 2006 Rob Landley <rob@landley.net>
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7 | * Copyright 2006 Bernhard Fischer <rep.nop@aon.at>
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8 | *
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9 | * Licensed under GPLv2, see file LICENSE in this tarball for details.
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10 | */
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11 |
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12 | #include <sys/klog.h>
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13 | #include "libbb.h"
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14 |
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15 | int dmesg_main(int argc, char **argv);
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16 | int dmesg_main(int argc, char **argv)
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17 | {
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18 | char *size, *level;
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19 | int flags = getopt32(argv, "cs:n:", &size, &level);
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20 |
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21 | if (flags & 4) {
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22 | if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
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23 | bb_perror_msg_and_die("klogctl");
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24 | } else {
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25 | int len;
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26 | char *buf;
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27 |
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28 | len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384;
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29 | buf = xmalloc(len);
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30 | if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
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31 | bb_perror_msg_and_die("klogctl");
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32 |
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33 | // Skip <#> at the start of lines, and make sure we end with a newline.
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34 |
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35 | if (ENABLE_FEATURE_DMESG_PRETTY) {
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36 | int last = '\n';
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37 | int in;
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38 |
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39 | for (in = 0; in<len;) {
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40 | if (last == '\n' && buf[in] == '<') in += 3;
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41 | else putchar(last = buf[in++]);
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42 | }
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43 | if (last != '\n') putchar('\n');
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44 | } else {
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45 | write(1,buf,len);
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46 | if (len && buf[len-1]!='\n') putchar('\n');
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47 | }
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48 |
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49 | if (ENABLE_FEATURE_CLEAN_UP) free(buf);
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50 | }
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51 |
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52 | return 0;
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53 | }
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