Motorola USB08 - page 177

Universal USB Device Driver (USBIO)
Programming Interface
USB08 Evaluation Board Designer Reference Manual
MOTOROLA Universal USB Device Driver (USBIO) 177
IOCTL_USBIO_ABORT_PIPE
The IOCTL_USBIO_ABORT_PIPE operation causes that all
outstanding requests for the pipe are cancelled.
lpInBuffer Not used with this operation. Set to NULL.
nInBufferSize Not used with this operation. Set to zero.
lpOutBuffer Not used with this operation. Set to NULL.
nOutBufferSize Not used with this operation. Set to zero.
Comments All outstanding read or write requests on the pipe are aborted and
returned with an error status of USBIO_ERR_CANCELLED.