SR_PRIV int serial_write_blocking(struct sr_serial_dev_inst *serial,
const void *buf, size_t count);
SR_PRIV int serial_write_nonblocking(struct sr_serial_dev_inst *serial,
const void *buf, size_t count);
SR_PRIV int serial_write_blocking(struct sr_serial_dev_inst *serial,
const void *buf, size_t count);
SR_PRIV int serial_write_nonblocking(struct sr_serial_dev_inst *serial,
const void *buf, size_t count);