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       comedi_poll - force updating of streaming buffer


       #include <comedilib.h>

       int comedi_poll (comedi_t * device, unsigned int subdevice);


       The  function  comedi_poll()  is  used on a subdevice that has a Comedi
       command in progress in  order  to  update  the  streaming  buffer.   If
       supported  by  the  driver,  all  available  samples  are copied to the
       streaming buffer.  These samples may  be  pending  in  DMA  buffers  or
       device  FIFOs.   If sucessful, the number of additional bytes available
       is returned.  If there is an error, -1 is returned.

                                28 October 2007