mirror of
https://github.com/sheumann/hush.git
synced 2024-08-18 06:29:11 +00:00
This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
48 lines
1008 B
C
48 lines
1008 B
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Factored out of mpstat/iostat.
|
|
*
|
|
* Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
|
|
*
|
|
* Licensed under GPLv2, see file LICENSE in this source tree.
|
|
*/
|
|
#include "libbb.h"
|
|
|
|
/* Does str start with "cpu"? */
|
|
int FAST_FUNC starts_with_cpu(const char *str)
|
|
{
|
|
return ((str[0] - 'c') | (str[1] - 'p') | (str[2] - 'u')) == 0;
|
|
}
|
|
|
|
/*
|
|
* Get number of processors. Uses /proc/stat.
|
|
* Return value 0 means one CPU and non SMP kernel.
|
|
* Otherwise N means N processor(s) and SMP kernel.
|
|
*/
|
|
unsigned FAST_FUNC get_cpu_count(void)
|
|
{
|
|
FILE *fp;
|
|
char line[256];
|
|
int proc_nr = -1;
|
|
|
|
fp = xfopen_for_read("/proc/stat");
|
|
while (fgets(line, sizeof(line), fp)) {
|
|
if (!starts_with_cpu(line)) {
|
|
if (proc_nr >= 0)
|
|
break; /* we are past "cpuN..." lines */
|
|
continue;
|
|
}
|
|
if (line[3] != ' ') { /* "cpuN" */
|
|
int num_proc;
|
|
if (sscanf(line + 3, "%u", &num_proc) == 1
|
|
&& num_proc > proc_nr
|
|
) {
|
|
proc_nr = num_proc;
|
|
}
|
|
}
|
|
}
|
|
|
|
fclose(fp);
|
|
return proc_nr + 1;
|
|
}
|