micro-utils/src/coreutils/nproc/nproc.c

#include <stdio.h>
#include <unistd.h>

int main(void) {
	long count = sysconf(_SC_NPROCESSORS_ONLN);
	if (count <= 0)
		count = 1;

	printf("%ld\n", count);
	return 0;
}