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

#ifdef PIPE2
#define PIPE(x) pipe2(x,0)
#define PIPE_s "pipe2"
#else
#define PIPE(x) pipe(x)
#define PIPE_s "pipe"
#endif

// figure time in seconds
double figure_time(struct timespec start, struct timespec stop)
{
  double start_time = (double)start.tv_sec +           // seconds
                      ((double)start.tv_nsec)*1.0e-9;  // nanoseconds
  double end_time   = (double)stop.tv_sec   +
                      ((double)stop.tv_nsec)  *1.0e-9;

  return end_time - start_time;
}

int
main(int argc, char **argv)
{
	int fd[2];
	size_t i;
	struct timespec start, stop;

	clock_gettime(CLOCK_REALTIME, &start);
	for (i = 0; i < 10*1000*1000; i++) {
		if (PIPE(fd) != 0)
			err(1, "pipe");
		close(fd[0]);
		close(fd[1]);
	}
	clock_gettime(CLOCK_REALTIME, &stop);

	printf("Function: %s() Time: %g\n", PIPE_s, figure_time(start, stop));

	return 0;
}