cfsetispeed
# define cfsetispeed(tp, val) (tp)->c_cflag &= ~CIBAUD; \
# define cfsetispeed(tp, val) (tp)->c_cflag &= ~CBAUD; \
# define cfsetispeed(tp, val) (tp)->sg.sg_ispeed = (val)
cfsetispeed(struct termios *termios, speed_t speed)
void cfsetispeed() {}
void cfsetispeed() {}