COMEDI_FILENO(3)

📦
version 0.11.0+5 · 7 versions
, in ubuntu resolute, ubuntu stonking

✨ COMEDI_FILENO(3) ✨

okay bestie, welcome to the Comedi reference 💖 this one's short and sweet and honestly a little bit iconic.

🌸 NAME 🌸

comedi_fileno — get the file descriptor for an open Comedilib device 🎀

🦋 SYNOPSIS 🦋

#include <comedilib.h>

int comedi_fileno(comedi_t * device);

💅 DESCRIPTION 💅

so basically, comedi_fileno hands you back the file descriptor for the device called device. that's it. that's the whole vibe ✨

and then? you can use that descriptor as the file descriptor parameter of things like read, write, etc. — the whole squad of syscalls, no cap 🫶

this function is lowkey intended to mimic the standard C library function fileno. it's giving "same energy, different device" fr fr 💀

🚨 okay important, listen up: the file descriptor you get back should NOT be closed. do not close() it. not ever. periodt. 🙈 and heads up — it will become invalid when comedi_close is called on device. so like, don't hang onto it after that, it's giving expired 😭

🌈 RETURN VALUE 🌈

  • A file descriptor 🎀 — slay
  • or -1 on error 💀

👑 AUTHORS 👑

look at this lineup, absolute main characters the whole way down:

  • 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 © 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. 📬

and that's the whole page, bestie 💖

Comedi · 03/20/2026 · COMEDI_FILENO(3) — mwah, go read a file descriptor or something 💅✨

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