comedi_errno - number of last Comedilib error

DavidSchleef <ds@schleef.org>
           Author.

       FrankMoriHess <fmhess@users.sourceforge.net>
           Author.

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

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

       IanAbbott <abbotti@mev.co.uk>
           Author.

       ÉricPiel <piel@delmic.com>
           Author.

       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.

Comedi                                             03/04/2025                                    COMEDI_ERRNO(3)

       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 by calling comedi_errno This error number
       can be converted to a human-readable form by the functions comedi_perror and 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_errno returns an integer describing the most recent Comedilib error. This integer may
       be used as the errnum parameter for comedi_strerror.

       comedi_errno - number of last Comedilib error

#include<comedilib.h>intcomedi_errno(void);