1 /* vi: set sw=4 ts=4: */
3 * Factored out of mpstat/iostat.
5 * Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
7 * Licensed under GPLv2, see file LICENSE in this source tree.
11 /* Does str start with "cpu"? */
12 int FAST_FUNC
starts_with_cpu(const char *str
)
14 return ((str
[0] - 'c') | (str
[1] - 'p') | (str
[2] - 'u')) == 0;
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.
22 unsigned FAST_FUNC
get_cpu_count(void)
28 fp
= xfopen_for_read("/proc/stat");
29 while (fgets(line
, sizeof(line
), fp
)) {
30 if (!starts_with_cpu(line
)) {
32 break; /* we are past "cpuN..." lines */
35 if (line
[3] != ' ') { /* "cpuN" */
37 if (sscanf(line
+ 3, "%u", &num_proc
) == 1