1COMEDI_POLL(3) Comedi reference COMEDI_POLL(3)
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6 comedi_poll - force updating of streaming buffer
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9 #include <comedilib.h>
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11 int comedi_poll(comedi_t * device, unsigned int subdevice);
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14 The function comedi_poll is used on a subdevice that has a Comedi
15 command in progress in order to update the streaming buffer. If
16 supported by the driver, all available samples are copied to the
17 streaming buffer. These samples may be pending in DMA buffers or device
18 FIFOs. Only a few Comedi drivers support this operation.
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21 On success, comedi_poll returns the number of additional bytes
22 available. On failure, -1 is returned.
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25 David Schleef <ds@schleef.org>
26 Author.
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28 Frank Mori Hess <fmhess@users.sourceforge.net>
29 Author.
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31 Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
32 Author.
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34 Bernd Porr <tech@linux-usb-daq.co.uk>
35 Author.
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37 Ian Abbott <abbotti@mev.co.uk>
38 Author.
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40 Éric Piel <piel@delmic.com>
41 Author.
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44 Copyright © 1998-2003 David Schleef
45 Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
46 Copyright © 2002-2003 Herman Bruyninckx
47 Copyright © 2012 Bernd Porr
48 Copyright © 2012 Ian Abbott
49 Copyright © 2012, 2015 Éric Piel
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51 This document is part of Comedilib. In the context of this document,
52 the term "source code" as defined by the license is interpreted as the
53 XML source.
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55 This library is free software; you can redistribute it and/or modify it
56 under the terms of the GNU Lesser General Public License as published
57 by the Free Software Foundation, version 2.1 of the License.
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59 This library is distributed in the hope that it will be useful, but
60 WITHOUT ANY WARRANTY; without even the implied warranty of
61 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
62 General Public License for more details.
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64 You should have received a copy of the GNU Lesser General Public
65 License along with this library; if not, write to the Free Software
66 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
67 USA.
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72Comedi 05/11/2017 COMEDI_POLL(3)