1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*
* Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
*
* Licensed under GPLv2, see LICENSE in this source tree
*/
//config:config NPROC
//config: bool "nproc (248 bytes)"
//config: default y
//config: help
//config: Print number of CPUs
//applet:IF_NPROC(APPLET_NOFORK(nproc, nproc, BB_DIR_USR_BIN, BB_SUID_DROP, nproc))
//kbuild:lib-$(CONFIG_NPROC) += nproc.o
//usage:#define nproc_trivial_usage
//usage: ""
//TODO: "[--all] [--ignore=N]"
//usage:#define nproc_full_usage "\n\n"
//usage: "Print number of CPUs"
#include <sched.h>
#include "libbb.h"
int nproc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int nproc_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
unsigned long mask[1024];
unsigned i, count = 0;
//applet_long_options = ...;
//getopt32(argv, "");
//if --all, count /sys/devices/system/cpu/cpuN dirs, else:
if (sched_getaffinity(0, sizeof(mask), (void*)mask) == 0) {
for (i = 0; i < ARRAY_SIZE(mask); i++) {
unsigned long m = mask[i];
while (m) {
if (m & 1)
count++;
m >>= 1;
}
}
}
if (count == 0)
count++;
printf("%u\n", count);
return 0;
}
|
