comedi_get_...vice_running(9)

✨ comedi_get_is_subdevice_running ✨

okay so real quick before we dive in — this is from the Kernel API Manual, section 9, and the page is literally called comedi_get_...vice_running(9) (yes the title is doing the absolute most with those ellipsis dots, we love a dramatic abbreviation 💅). Anyway. Buckle up bestie, this one's short but she's important.

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🌸 NAME 🌸

comedi_get_is_subdevice_running — get if an async command is running on a subdevice 🎀

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🦋 SYNOPSIS 🦋

bool comedi_get_is_subdevice_running (struct comedi_subdevice *s );

that's it. that's the whole vibe. one function, one argument, returns a bool. iconic behaviour honestly ✨

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💜 ARGUMENTS 💜

• s — your COMEDI subdevice. that's the whole thing, she's just a struct comedi_subdevice * and she's the main character here 🫶

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🔥 DESCRIPTION 🔥

okay so here's the tea 🍵 — if an asynchronous COMEDI command is running on the subdevice, this function increments a reference counter. like, it's putting a little hold on it, iykyk.

and the important part, no cap: if the function's return value tells you that a command is running, then the details of that command will not be destroyed before you make a matching call to comedi_put_is_subdevice_running. so basically it's a little "hey don't delete this yet, i'm still looking at it" situation, and you have to pair them up. matching calls only, bestie. don't leave her hanging 😭

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👑 RETURN 👑

• true — if an asynchronous COMEDI command is active on the subdevice 💖
• false — otherwise 🙈

that's the whole return value situation. binary. clean. we stan.

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🌈 SEE ALSO 🌈

go look at these, they're all part of the same little family:

• Kernel file ./drivers/comedi/comedi_fops.c
• struct comedi_file(9)
• comedi_dev_put(9)
• comedi_dev_get_from_minor(9)
• comedi_is_subdevice_running(9)
• comedi_put_is_subdevice_running(9)
• comedi_set_spriv_auto_free(9)
• comedi_alloc_spriv(9)
• get_valid_routes(9)
• comedi_event(9)

like genuinely the whole friend group is in the SEE ALSO and they all ate 🔥

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⭐ quick reminder: the get/put pairing is not optional. get it, use the details, put it back. that's the whole assignment ✨

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and that's the page!! 🎀 brought to you by the fine folks over at ./drivers/comedi, dated October 2026, filed under comedi_get_...vice_running(9) — mwah, love u, go increment that refcount responsibly 💜🌟