dio_read timeout?

[AC <alcastle@xxxxxxxxx>]

I'm using dio_read to read data from a serial port via a php cli script, 
this works great.

However I'm unable to get dio_read to timeout if there's no data to 
read. No matter how I formulate the while loop, set_time_out, etc I
can't seem to get it to stop reading and move on.

Anyone have a work around or ideas?

Example snippet, where $fd is a valid file descriptor.


function readData($fd) {
        $startTime=microtime();
        $endTime=$startTime+'.02';

        $data=null;

	$i=0;
        #while($startTime < $endTime){
	while($i < 5) {
                $data.=dio_read($fd);

                if($data) {
                   echo "Here's some data: $data\n";
                   break;
                }
		$i++;
        }

} //end function

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