IOCTL_SERIAL_GET_TIMEOUTS control code
The IOCTL_SERIAL_GET_TIMEOUTS request returns the time-out values that the serial controller driver uses with read and write requests.
To set time-outs, a client can use an IOCTL_SERIAL_SET_TIMEOUTS request.
For more information about time-outs, see Setting Read and Write Time-Outs for a Serial Device.
The Parameters.DeviceIoControl.OutputBufferLength member is set to the size, in bytes, of a SERIAL_TIMEOUTS structure.
The AssociatedIrp.SystemBuffer member points to a client-allocated SERIAL_TIMEOUTS structure that the serial controller driver uses to output information about read and write time-out values.
If the request is successful, the Information member is set to the size, in bytes, of a SERIAL_TIMEOUTS 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.