1COMEDI_PERROR(3) Comedi reference COMEDI_PERROR(3)
2
3
4
6 comedi_perror - print a Comedilib error message
7
9 #include <comedilib.h>
10
11 void comedi_perror(const char * s);
12
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.
19
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.
25
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.
30
32 David Schleef <ds@schleef.org>
33 Author.
34
35 Frank Mori Hess <fmhess@users.sourceforge.net>
36 Author.
37
38 Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
39 Author.
40
41 Bernd Porr <tech@linux-usb-daq.co.uk>
42 Author.
43
44 Ian Abbott <abbotti@mev.co.uk>
45 Author.
46
47 Éric Piel <piel@delmic.com>
48 Author.
49
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
57
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.
70
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.
75
76
77
78
79Comedi 05/11/2017 COMEDI_PERROR(3)