Last change
on this file since 3705 was 2725, checked in by Bruno Cornec, 13 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
|
-
Property svn:eol-style
set to
native
|
File size:
1008 bytes
|
Line | |
---|
1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Factored out of mpstat/iostat.
|
---|
4 | *
|
---|
5 | * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
|
---|
6 | *
|
---|
7 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
---|
8 | */
|
---|
9 | #include "libbb.h"
|
---|
10 |
|
---|
11 | /* Does str start with "cpu"? */
|
---|
12 | int FAST_FUNC starts_with_cpu(const char *str)
|
---|
13 | {
|
---|
14 | return ((str[0] - 'c') | (str[1] - 'p') | (str[2] - 'u')) == 0;
|
---|
15 | }
|
---|
16 |
|
---|
17 | /*
|
---|
18 | * Get number of processors. Uses /proc/stat.
|
---|
19 | * Return value 0 means one CPU and non SMP kernel.
|
---|
20 | * Otherwise N means N processor(s) and SMP kernel.
|
---|
21 | */
|
---|
22 | unsigned FAST_FUNC get_cpu_count(void)
|
---|
23 | {
|
---|
24 | FILE *fp;
|
---|
25 | char line[256];
|
---|
26 | int proc_nr = -1;
|
---|
27 |
|
---|
28 | fp = xfopen_for_read("/proc/stat");
|
---|
29 | while (fgets(line, sizeof(line), fp)) {
|
---|
30 | if (!starts_with_cpu(line)) {
|
---|
31 | if (proc_nr >= 0)
|
---|
32 | break; /* we are past "cpuN..." lines */
|
---|
33 | continue;
|
---|
34 | }
|
---|
35 | if (line[3] != ' ') { /* "cpuN" */
|
---|
36 | int num_proc;
|
---|
37 | if (sscanf(line + 3, "%u", &num_proc) == 1
|
---|
38 | && num_proc > proc_nr
|
---|
39 | ) {
|
---|
40 | proc_nr = num_proc;
|
---|
41 | }
|
---|
42 | }
|
---|
43 | }
|
---|
44 |
|
---|
45 | fclose(fp);
|
---|
46 | return proc_nr + 1;
|
---|
47 | }
|
---|
Note:
See
TracBrowser
for help on using the repository browser.