52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/*
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* Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2, see LICENSE in this source tree
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*/
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//config:config NPROC
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//config: bool "nproc (248 bytes)"
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//config: default y
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//config: help
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//config: Print number of CPUs
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//applet:IF_NPROC(APPLET(nproc, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_NPROC) += nproc.o
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//usage:#define nproc_trivial_usage
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//usage: ""
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//TODO: "[--all] [--ignore=N]"
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//usage:#define nproc_full_usage "\n\n"
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//usage: "Print number of CPUs"
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#include <sched.h>
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#include "libbb.h"
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int nproc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nproc_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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{
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unsigned long mask[1024];
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unsigned i, count = 0;
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//applet_long_options = ...;
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//getopt32(argv, "");
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//if --all, count /sys/devices/system/cpu/cpuN dirs, else:
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if (sched_getaffinity(0, sizeof(mask), (void*)mask) == 0) {
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for (i = 0; i < ARRAY_SIZE(mask); i++) {
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unsigned long m = mask[i];
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while (m) {
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if (m & 1)
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count++;
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m >>= 1;
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}
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}
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}
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if (count == 0)
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count++;
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printf("%u\n", count);
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return 0;
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}
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