If the host lacks SOCK_CLOEXEC, bail out with -EINVAL. If the host lacks SOCK_ONONBLOCK, try to emulate it with fcntl() and O_NONBLOCK. Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>