Man pages sections > man3 > comedi_poll

comedi_poll - force updating of streaming buffer

COMEDI_POLL(3) Comedi reference COMEDI_POLL(3)

NAME

comedi_poll - force updating of streaming buffer

SYNOPSIS

#include <comedilib.h>
int comedi_poll(comedi_t * device, unsigned int subdevice);

DESCRIPTION

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 successful, the number of additional bytes available is returned. If there is an error, -1 is returned.

AUTHORS

David Schleef <ds@schleef.org>
Author.
Frank Mori Hess <fmhess@users.sourceforge.net>
Author.
Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
Author.
Bernd Porr <tech@linux-usb-daq.co.uk>
Author.
Ian Abbott <abbotti@mev.co.uk>
Author.
Éric Piel <piel@delmic.com>
Author.
Copyright © 1998-2003 David Schleef
 
Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
 
Copyright © 2002-2003 Herman Bruyninckx
 
Copyright © 2012 Bernd Porr
 
Copyright © 2012 Ian Abbott
 
Copyright © 2012 Éric Piel
 
This document is part of Comedilib. In the context of this document, the term "source code" as defined by the license is interpreted as the XML source.
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, version 2.1 of the License.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 
08/09/2017 Comedi