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#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main() {
  int err;

  err = isatty(-1);
  assert(!err);
  assert(errno == EBADF);

  err = isatty(open("/dev/stdin", O_RDONLY));
  assert(err == 1);

  err = isatty(open("/dev/null", O_RDONLY));
  assert(!err);

  err = isatty(open("/dev", O_RDONLY));
  assert(!err);

  puts("success");

  return EXIT_SUCCESS;
}