The IOCTL_SERIAL_GET_DTRRTS request returns information about the data terminal ready (DTR) control signal and the request to send (RTS) control signal.
Input Buffer Length
The AssociatedIrp.SystemBuffer member points to a client-allocated ULONG buffer that Serial.sys uses to output information about the DTR and RTS. The ULONG buffer is set to zero or to the bitwise-OR of one or more of the following flag bits:
Output Buffer Length
The Parameters.DeviceIoControl.OutputBufferLength member is set to the size in bytes of a ULONG.
If the request is successful, the Information member is set to the size in bytes of a ULONG. 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.
|Header||ntddser.h (include Ntddser.h)|