_fd_dir = None
# /dev/fd does not work on FreeBSD, see bug #478446
if platform.system() in ('FreeBSD',) and _fd_dir == '/dev/fd':
#if platform.system() in ('FreeBSD',) and _fd_dir == '/dev/fd':
# _fd_dir = None
if _fd_dir is not None:
def get_open_fds():