COMEDI_SET_WRITE_SUB(3)

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

💖 COMEDI_SET_WRITE_SUB(3) 💖

okay bestie, welcome to the Comedi reference manual, page COMEDI_SET_WRITE_SUB(3). this is the one that picks which subdevice gets to be the streaming-output main character. let's get into it 🫶

✨ NAME ✨

comedi_set_write_subdevice — set the streaming output subdevice, aka choose ur write queen 👑

✨ SYNOPSIS ✨

#include <comedilib.h>

int comedi_set_write_subdevice(comedi_t * device,
                               unsigned int subdevice);

✨ STATUS ✨

works for Linux "in-tree" Comedi since kernel version 3.19. so if ur kernel is older than that... girl, respectfully, upgrade 😭

✨ DESCRIPTION ✨

so comedi_set_write_subdevice sets subdevice as the current "write" subdevice, but only if that subdevice actually supports streaming output commands. vibe check first, always 💅

no action is performed if subdevice is already the current "write" subdevice. like, nothing happens, it's already her, we don't need to re-crown her ✨

and this is the important bit bestie: changes are local to the open file description for this device, and have no effect on other open file descriptions for the underlying device node. it's giving private group chat, not a public announcement 📣

✨ RETURN VALUE ✨

  • on success, 0 is returned 🎀
  • on failure, -1 is returned 💀

✨ AUTHORS ✨

the icons who built this, fr fr:

  • 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!! 🌈 this came from the Comedi manual, dated 03/20/2026, and the footer name is COMEDI_SET_WRITE_SUB(3) — go forth and set ur write subdevice, ily, mwah 💖🧚🌟

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