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-rw-r--r--coreutils/nproc.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/coreutils/nproc.c b/coreutils/nproc.c
new file mode 100644
index 000000000..d7c6a4ba1
--- /dev/null
+++ b/coreutils/nproc.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under GPLv2, see LICENSE in this source tree
+ */
+//config:config NPROC
+//config: bool "nproc"
+//config: default y
+//config: help
+//config: Print number of CPUs
+
+//applet:IF_NPROC(APPLET(nproc, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//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;
+}