NAME

       comedi_perror - print a Comedilib error message

SYNOPSIS

       #include <comedilib.h>

       void comedi_perror(const char * s);

DESCRIPTION

       When a Comedilib function fails, it usually returns -1 or NULL, depending on the return
       type. An internal library variable stores an error number, which can be retrieved with
       comedi_errno. This error number can be converted to a human-readable form by the functions
       comedi_perror or comedi_strerror.

       These functions are intended to mimic the behavior of the standard C library functions
       perror, strerror, and errno. In particular, Comedilib functions sometimes return an error
       that is generated inside the C library; the comedi error message in this case is the same
       as the C library.

       The function comedi_perror prints an error message to the standard error output stream
       stderr. The error message consists of the argument string s, a colon, a space, a
       description of the error condition, and a new line.

AUTHORS

       David Schleef <ds@schleef.org>
           Author.

       Frank Mori Hess <fmhess@users.sourceforge.net>
           Author.

       Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
           Author.

       Bernd Porr <tech@linux-usb-daq.co.uk>
           Author.

       Ian Abbott <abbotti@mev.co.uk>
           Author.

       Éric Piel <piel@delmic.com>
           Author.

COPYRIGHT

       Copyright © 1998-2003 David Schleef
       Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
       Copyright © 2002-2003 Herman Bruyninckx
       Copyright © 2012 Bernd Porr
       Copyright © 2012 Ian Abbott
       Copyright © 2012, 2015 Éric Piel

       This document is part of Comedilib. In the context of this document, the term "source
       code" as defined by the license is interpreted as the XML source.

       This library is free software; you can redistribute it and/or modify it under the terms of
       the GNU Lesser General Public License as published by the Free Software Foundation,
       version 2.1 of the License.

       This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU Lesser General Public License for more details.

       You should have received a copy of the GNU Lesser General Public License along with this
       library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
       Boston, MA 02111-1307 USA.