// ntddser.h

// CTL_CODE(0x001b, 0x002, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_SERIAL_SET_QUEUE_SIZE 0x001B0008
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Windows Driver Kit DDI reference (ni-ntddser-ioctl_serial_set_queue_size)

IOCTL_SERIAL_SET_QUEUE_SIZE IOCTL

Description

The IOCTL_SERIAL_SET_QUEUE_SIZE request sets the size of the internal receive buffer. If the requested size is greater than the current receive buffer size, a new receive buffer is created. Otherwise, the receive buffer is not changed.

Parameters

Major code

Input buffer

The AssociatedIrp.SystemBuffer member points to a client-allocated SERIAL_QUEUE_SIZE structure that is used to input a receive buffer size.

Input buffer length

The Parameters.DeviceIoControl.InputBufferLength member is set to the size, in bytes, of a SERIAL_QUEUE_SIZE structure.

Output buffer

None.

Output buffer length

None.

Input/output buffer

Input/output buffer length

Status block

The Information member is set to zero.

The Status member is set to one of the Generic Status Values for Serial Device Control Requests.

IOCTL_SERIAL_SET_QUEUE_SIZE - NtDoc