COMEDI_GET_N_SUBDEVI(3)

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

💖 comedi_get_n_subdevices — the "how many subdevices tho" bestie 💖

okay so this is a page from the Comedi reference, manual section 3 (that's the library-functions corner of the manual, iykyk). sit down, grab a boba, we're counting subdevices. it's giving short and sweet fr fr. ✨

🌸 NAME 🌸

comedi_get_n_subdevices — literally just: the number of subdevices. that's it, that's the whole vibe. 🎀

🦋 SYNOPSIS 🦋

#include <comedilib.h>

int comedi_get_n_subdevices(comedi_t * device);

look at that. one include, one function, one argument. no cap, this is the easiest signature you'll see all week. 💅

💫 DESCRIPTION 💫

so comedi_get_n_subdevices returns the number of subdevices that belong to the Comedi device you're pointing at with the device parameter. that's the count. the whole count. nothing but the count. 🫶

and if something goes wrong? it hands you back -1. not zero, not a shrug, not a "bestie idk" — literally -1 on error. keep that in mind, because -1 is not a valid number of subdevices and you should not be out here treating it like one. 😭

lowkey the whole function is one line of truth: count on success, -1 on error. slay. ⭐

👑 AUTHORS 👑

the iconic legends who wrote this into existence, in order:

  • 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.

six (6) authors for a subdevice counter. main character energy across the board, we love to see it. 💜

the receipts, bestie:

  • 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 doc is part of Comedilib. and here's the little detail you cannot skip: in the context of this document, the term "source code" as defined by the license means the XML source. yep. that's the interpretation. noted, respected, written down. 🎀

now the legal bit, but make it cute:

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. go off, remix responsibly. 💅

and this library is distributed in the hope that it will be useful, but — say it with me — WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. for the full deets, go read the GNU Lesser General Public License. 🫶

you should have gotten 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. yes that's the whole address, no I'm not abbreviating it, this is a legal situation. 🍓

okay that's the page!! this was Comedi, dated 03/20/2026, and the manual page is COMEDI_GET_N_SUBDEVI(3). go count your subdevices, bestie — and if you get -1, that's an error, not a personality trait. mwah. 💖✨🧚🌸🔥

📦 where this page comes from