NAME

       comedi_get_buffer_contents - streaming buffer status

SYNOPSIS

       #include <comedilib.h>

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

DESCRIPTION

       The function comedi_get_buffer_contents is used on a subdevice that has a Comedi command in progress to
       get the number of unread bytes. For a streaming input command, this is the number of bytes that can be
       read. For a streaming output command, subtracting this from the buffer size gives the space available to
       be written.

RETURN VALUE

       On success, comedi_get_buffer_contents returns the number of unread bytes in the buffer. On failure, -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

       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, 2015 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.

Comedi                                             02/18/2020                            COMEDI_GET_BUFFER_CO(3)