# SPORT_CANCEL_IO (W*S)

Serial Port I/O Function: Cancels any I/O in progress to the specified port.

## Module

USE IFPORT

result = SPORT_CANCEL_IO (port)

port | (Input) Integer. The port number.

## Results

The result type is INTEGER(4). The result is zero if successful; otherwise, a Windows* error value.

### Note

This call also kills the thread that keeps an outstanding read operation to the serial port. This call must be done before any of the port characteristics are modified.

## Example

    USE IFPORT
    INTEGER(4) iresult
    iresult = SPORT_CANCEL_IO( 2 )
    END

Parent topic: Serial Port I/O Library Routines