1COMEDI_ERRNO(3) Comedi reference COMEDI_ERRNO(3)
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6 comedi_errno - number of last Comedilib error
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9 #include <comedilib.h>
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11 int comedi_errno(void);
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14 When a Comedilib function fails, it usually returns -1 or NULL,
15 depending on the return type. An internal library variable stores an
16 error number, which can be retrieved by calling comedi_errno This error
17 number can be converted to a human-readable form by the functions
18 comedi_perror and comedi_strerror.
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20 These functions are intended to mimic the behavior of the standard C
21 library functions perror, strerror, and errno. In particular, Comedilib
22 functions sometimes return an error that is generated inside the C
23 library; the comedi error message in this case is the same as the C
24 library.
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26 The function comedi_errno returns an integer describing the most recent
27 Comedilib error. This integer may be used as the errnum parameter for
28 comedi_strerror.
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31 David Schleef <ds@schleef.org>
32 Author.
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34 Frank Mori Hess <fmhess@users.sourceforge.net>
35 Author.
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37 Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
38 Author.
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40 Bernd Porr <tech@linux-usb-daq.co.uk>
41 Author.
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43 Ian Abbott <abbotti@mev.co.uk>
44 Author.
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46 Éric Piel <piel@delmic.com>
47 Author.
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50 Copyright © 1998-2003 David Schleef
51 Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
52 Copyright © 2002-2003 Herman Bruyninckx
53 Copyright © 2012 Bernd Porr
54 Copyright © 2012 Ian Abbott
55 Copyright © 2012, 2015 Éric Piel
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57 This document is part of Comedilib. In the context of this document,
58 the term "source code" as defined by the license is interpreted as the
59 XML source.
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61 This library is free software; you can redistribute it and/or modify it
62 under the terms of the GNU Lesser General Public License as published
63 by the Free Software Foundation, version 2.1 of the License.
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65 This library is distributed in the hope that it will be useful, but
66 WITHOUT ANY WARRANTY; without even the implied warranty of
67 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
68 General Public License for more details.
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70 You should have received a copy of the GNU Lesser General Public
71 License along with this library; if not, write to the Free Software
72 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
73 USA.
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78Comedi 05/11/2017 COMEDI_ERRNO(3)