1COMEDI_GET_BUFFER_RE(3) Comedi reference COMEDI_GET_BUFFER_RE(3)
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6 comedi_get_buffer_read_offset - streaming buffer read offset
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9 #include <comedilib.h>
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11 int comedi_get_buffer_read_offset(comedi_t * device,
12 unsigned int subdevice);
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15 The function comedi_get_buffer_read_offset is used on a subdevice that
16 has a Comedi command in progress to get the current read position in
17 the streaming buffer as an offset in bytes from the start of the
18 buffer. The position will wrap around to 0 when it reaches the buffer
19 size. This offset is only useful for memory mapped buffers.
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21 This function replaces comedi_get_buffer_offset and has the same
22 functionality.
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25 On success, comedi_get_buffer_read_offset returns the current read
26 position as an offset in bytes from the start of the buffer. On
27 failure, -1 is returned.
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30 David Schleef <ds@schleef.org>
31 Author.
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33 Frank Mori Hess <fmhess@users.sourceforge.net>
34 Author.
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36 Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
37 Author.
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39 Bernd Porr <tech@linux-usb-daq.co.uk>
40 Author.
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42 Ian Abbott <abbotti@mev.co.uk>
43 Author.
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45 Éric Piel <piel@delmic.com>
46 Author.
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49 Copyright © 1998-2003 David Schleef
50 Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
51 Copyright © 2002-2003 Herman Bruyninckx
52 Copyright © 2012 Bernd Porr
53 Copyright © 2012 Ian Abbott
54 Copyright © 2012, 2015 Éric Piel
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56 This document is part of Comedilib. In the context of this document,
57 the term "source code" as defined by the license is interpreted as the
58 XML source.
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60 This library is free software; you can redistribute it and/or modify it
61 under the terms of the GNU Lesser General Public License as published
62 by the Free Software Foundation, version 2.1 of the License.
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64 This library is distributed in the hope that it will be useful, but
65 WITHOUT ANY WARRANTY; without even the implied warranty of
66 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
67 General Public License for more details.
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69 You should have received a copy of the GNU Lesser General Public
70 License along with this library; if not, write to the Free Software
71 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
72 USA.
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77Comedi 05/11/2017 COMEDI_GET_BUFFER_RE(3)