The IOCTL_SERIAL_CONFIG_SIZE request returns information about configuration size.
Serial.sys always returns a configuration size of zero.
This request is obsolete and should not be used by new drivers for Microsoft Windows 2000 and later.
Input Buffer Length
The AssociatedIrp.SystemBuffer member points to a client-allocated ULONG buffer that Serial.sys uses to output configuration size information.
Output Buffer Length
The Parameters.DeviceIoControl.OutputBufferLength is set to the size in bytes of a ULONG.
Input / Output Buffer
Input / Output Buffer Length
The Information member is set to the size in bytes of a ULONG.
The Status member is set to one of the Generic Status Values for Serial Device Control Requests.
|Header||ntddser.h (include Ntddser.h)|