1COMEDI_PERROR(3)               Comedi reference               COMEDI_PERROR(3)
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NAME

6       comedi_perror - print a Comedilib error message
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SYNOPSIS

9       #include <comedilib.h>
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11       void comedi_perror(const char * s);
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DESCRIPTION

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 with comedi_errno. This error
17       number can be converted to a human-readable form by the functions
18       comedi_perror or 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_perror prints an error message to the standard
27       error output stream stderr. The error message consists of the argument
28       string s, a colon, a space, a description of the error condition, and a
29       new line.
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AUTHORS

32       David Schleef <ds@schleef.org>
33           Author.
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35       Frank Mori Hess <fmhess@users.sourceforge.net>
36           Author.
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38       Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
39           Author.
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41       Bernd Porr <tech@linux-usb-daq.co.uk>
42           Author.
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44       Ian Abbott <abbotti@mev.co.uk>
45           Author.
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47       Éric Piel <piel@delmic.com>
48           Author.
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51       Copyright © 1998-2003 David Schleef
52       Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
53       Copyright © 2002-2003 Herman Bruyninckx
54       Copyright © 2012 Bernd Porr
55       Copyright © 2012 Ian Abbott
56       Copyright © 2012, 2015 Éric Piel
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58       This document is part of Comedilib. In the context of this document,
59       the term "source code" as defined by the license is interpreted as the
60       XML source.
61
62       This library is free software; you can redistribute it and/or modify it
63       under the terms of the GNU Lesser General Public License as published
64       by the Free Software Foundation, version 2.1 of the License.
65
66       This library is distributed in the hope that it will be useful, but
67       WITHOUT ANY WARRANTY; without even the implied warranty of
68       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
69       General Public License for more details.
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71       You should have received a copy of the GNU Lesser General Public
72       License along with this library; if not, write to the Free Software
73       Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
74       USA.
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79Comedi                            05/11/2017                  COMEDI_PERROR(3)
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