IOCTL_SERIAL_GET_DTRRTS IOCTL (ntddser.h)
The IOCTL_SERIAL_GET_DTRRTS request returns information about the data terminal ready (DTR) control signal and the request to send (RTS) control signal.
Major code
Input buffer
None.
Input buffer length
None.
Output buffer
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.
Status block
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.
Requirements
| Requirement | Value |
|---|---|
| Header | ntddser.h (include Ntddser.h) |