Operation

The IOCTL_SERIAL_GET_HANDFLOW request returns information about the configuration of the handshake flow control set for a serial device.

To set the configuration of the handshake flow control, a client can use an IOCTL_SERIAL_SET_HANDFLOW request.

For more information about settings for handshake flow control, see the handshake flow control parameters SERIAL_DTR_MASK through SERIAL_FLOW_INVALID, which are defined in the header file ntddser.h in the Microsoft Windows Driver Kit (WDK).

Input

The Parameters.DeviceIoControl.OutputBufferLength is set to the size in bytes of a SERIAL_HANDFLOW structure.

Output

The AssociatedIrp.SystemBuffer points to a client-allocated SERIAL_HANDFLOW structure that Serial uses to output information about the configuration of handshake flow control.

I/O Status Block

If the request is successful, the Information member is set to the size in bytes of a SERIAL_HANDFLOW structure. Otherwise, the Information member is set to zero.

The Status member is set to one of the Generic Status Values for Serial Device Control Requests.

Requirements

Headers: Defined in ntddser.h. Include ntddser.h.

See Also

IOCTL_SERIAL_SET_HANDFLOW