COMEDI_SET_BUFFER_SI(3) Comedi reference COMEDI_SET_BUFFER_SI(3)
NAME
comedi_set_buffer_size - streaming buffer size of subdevice
SYNOPSIS
#include <comedilib.h>
int comedi_set_buffer_size(comedi_t * device, unsigned int subdevice, unsigned int size);
DESCRIPTION
The function comedi_set_buffer_size changes the size of the streaming buffer for the subdevice specified by device and subdevice. The
buffer size will be set to size bytes, rounded up to a multiple of the virtual memory page size. The virtual memory page size can be
determined using sysconf(_SC_PAGE_SIZE).
This function does not require special privileges. However, it is limited to a (adjustable) maximum buffer size, which can be changed by a
privileged user calling comedi_set_max_buffer_size, or running the program comedi_config.
RETURN VALUE
The new buffer size in bytes is returned on success. On 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.
COPYRIGHT
Copyright (C) 1998-2003 David Schleef
Copyright (C) 2001-2003, 2005, 2008 Frank Mori Hess
Copyright (C) 2002-2003 Herman Bruyninckx
Copyright (C) 2012 Bernd Porr
Copyright (C) 2012 Ian Abbott
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 07/06/2012 COMEDI_SET_BUFFER_SI(3)