1/* see LICENSE file for copyright and license details */
 2
 3#include <stdio.h>
 4#include <stdlib.h>
 5#include <unistd.h>
 6
 7#include "util.h"
 8
 9static void
10usage(void)
11{
12  eprintf("usage: %s [-a]\n", argv0);
13}
14
15// ?man nproc: print the number of available processors
16// ?man arguments: [-a]
17// ?man with no options, prints the number of processors currently
18// ?man online. -a prints the number installed, including any offline
19int
20main(int argc, char *argv[])
21{
22  int  aflag = 0;
23  long n;
24
25  ARGBEGIN
26  {
27    // ?man -a: count installed processors, not just online ones
28    case 'a':
29      aflag = 1;
30      break;
31    default:
32      usage();
33  }
34  ARGEND;
35
36  n = sysconf(aflag ? _SC_NPROCESSORS_CONF : _SC_NPROCESSORS_ONLN);
37  if (n <= 0)
38    n = 1;
39  printf("%ld\n", n);
40  return 0;
41}