IOCTL_SERIAL_GET_LINE_CONTROL IOCTL (ntddser.h)
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.
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.
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.
Requirements
| Requirement | Value |
|---|---|
| Header | ntddser.h (include Ntddser.h) |