Last change
on this file since 3493 was 2725, checked in by Bruno Cornec, 14 years ago |
- Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
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-
Property svn:eol-style
set to
native
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File size:
1008 bytes
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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Factored out of mpstat/iostat.
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4 | *
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5 | * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 | #include "libbb.h"
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10 |
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11 | /* Does str start with "cpu"? */
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12 | int FAST_FUNC starts_with_cpu(const char *str)
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13 | {
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14 | return ((str[0] - 'c') | (str[1] - 'p') | (str[2] - 'u')) == 0;
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15 | }
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16 |
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17 | /*
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18 | * Get number of processors. Uses /proc/stat.
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19 | * Return value 0 means one CPU and non SMP kernel.
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20 | * Otherwise N means N processor(s) and SMP kernel.
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21 | */
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22 | unsigned FAST_FUNC get_cpu_count(void)
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23 | {
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24 | FILE *fp;
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25 | char line[256];
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26 | int proc_nr = -1;
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27 |
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28 | fp = xfopen_for_read("/proc/stat");
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29 | while (fgets(line, sizeof(line), fp)) {
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30 | if (!starts_with_cpu(line)) {
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31 | if (proc_nr >= 0)
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32 | break; /* we are past "cpuN..." lines */
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33 | continue;
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34 | }
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35 | if (line[3] != ' ') { /* "cpuN" */
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36 | int num_proc;
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37 | if (sscanf(line + 3, "%u", &num_proc) == 1
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38 | && num_proc > proc_nr
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39 | ) {
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40 | proc_nr = num_proc;
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41 | }
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42 | }
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43 | }
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44 |
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45 | fclose(fp);
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46 | return proc_nr + 1;
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47 | }
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