Last change
on this file since 3736 was 3320, checked in by Bruno Cornec, 10 years ago |
- Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in
the move to 3.0
|
-
Property svn:eol-style
set to
native
|
File size:
1008 bytes
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Rev | Line | |
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[3320] | 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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