IOCTL_SERIAL_GET_LINE_CONTROL IOCTL

Description

The IOCTL_SERIAL_GET_LINE_CONTROL request returns information about the line control set for a serial device. The line control parameters include the number of stop bits, the number of data bits, and the parity.

To configure the line control, a client can use an IOCTL_SERIAL_SET_LINE_CONTROL request.

For information about valid line control register settings, see SERIAL_LINE_CONTROL.

Parameters

Major code

Input buffer

None.

Input buffer length

None.

Output buffer

The AssociatedIrp.SystemBuffer member points to a client-allocated SERIAL_LINE_CONTROL structure that the serial controller driver uses to output information about the line control configuration.

Output buffer length

The Parameters.DeviceIoControl.OutputBufferLength member is set to the size, in bytes, of a SERIAL_LINE_CONTROL structure.

Input/output buffer

Input/output buffer length

Status block

If the request is successful, the Information member is set to the size, in bytes, of a SERIAL_LINE_CONTROL 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.

See also

IOCTL_SERIAL_SET_LINE_CONTROL

SERIAL_LINE_CONTROL