test ioctl() vs fcntl() syscall speed

fioclex.c

// cc -O fioclex.c
// USE_IOCTL=0 time ./a.out
// USE_IOCTL=1 time ./a.out
#include <stdio.h>
#include <stdlib.h>

#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>

#ifndef __linux__
# include <sys/filio.h>
#endif

int main(int argc, char **argv) {
  int use_ioctl;
  int fd;
  int i;

  if (argv[1])
    fd = open(argv[1], O_RDONLY);
  else
    fd = STDERR_FILENO;

  if (fd == -1)
    return puts("open error"), EXIT_FAILURE;

  use_ioctl = getenv("USE_IOCTL") && atoi(getenv("USE_IOCTL"));

  for (i = 0; i < 10e6; i++) {
    if (use_ioctl) {
      if (ioctl(fd, FIOCLEX))
        abort();
    }
    else {
      if (fcntl(fd, F_SETFD, FD_CLOEXEC))
        abort();
    }
  }

  return 0;
}

fionbio.c

// cc -O fionbio.c
// USE_IOCTL=0 time ./a.out
// USE_IOCTL=1 time ./a.out
#include <stdio.h>
#include <stdlib.h>

#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>

#ifndef __linux__
# include <sys/filio.h>
#endif

int main(int argc, char **argv) {
  int use_ioctl;
  int set;
  int fd;
  int i;

  if (argv[1])
    fd = open(argv[1], O_RDONLY);
  else
    fd = STDERR_FILENO;

  if (fd == -1)
    return puts("open error"), EXIT_FAILURE;

  use_ioctl = getenv("USE_IOCTL") && atoi(getenv("USE_IOCTL"));
  set = 1;

  for (i = 0; i < 10e6; i++) {
    if (use_ioctl) {
      if (ioctl(fd, FIONBIO, &set))
        abort();
    }
    else {
      if (fcntl(fd, F_SETFL, O_NONBLOCK))
        abort();
    }
  }

  return 0;
}

What's the verdict?