comedi_handle_events(9)

💅 comedi_handle_events(9) — the Kernel API Manual glow-up

okay bestie, so this is a page straight out of the Kernel API Manual, and it's giving "small function, big responsibilities" energy, so let's get into it ✨

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🌸 NAME 🌸

comedi_handle_events — literally the function that handles events and maybe stops acquisition. multitasking icon 🎀

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✨ SYNOPSIS ✨

unsigned int comedi_handle_events (struct comedi_device *dev , struct
comedi_subdevice *s );

that's the whole vibe. it returns an unsigned int, no cap 👑

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🦋 ARGUMENTS 🦋

• dev — your COMEDI device. the main character, fr.
• s — your COMEDI subdevice. the sidekick that actually has the event flags 💅

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🔥 DESCRIPTION 🔥

so what does it actually do? it handles those outstanding asynchronous acquisition event flags that are associated with the subdevice. like, it checks the flags and deals with them, okay? periodt.

here's the important part: it calls the subdevice's s->cancel handler if the "end of acquisition", "error", or "overflow" event flags are set — and the whole point of that call is to stop the acquisition at the driver level. like, wrapping it up, pulling the plug, saying "we're done here" 🫶

then it calls comedi_event to further process the event flags. that may mark the asynchronous command as no longer running (possibly terminated with an error, which is lowkey sad 😭), and it may wake up tasks. so yeah, it's doing a lot behind the scenes.

and finally — the return value — it returns a bit-mask of the handled events. you get the receipts of what got handled 🧾✨

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👑 SEE ALSO 👑

Kernel file ./drivers/comedi/drivers.c, plus the whole friend group, no one left out:

comedi_set_hw_dev(9), comedi_alloc_devpriv(9), comedi_alloc_subdevices(9), comedi_alloc_subdev_readback(9), comedi_readback_insn_read(9), comedi_timeout(9), comedi_dio_insn_config(9), comedi_dio_update_state(9), comedi_bytes_per_scan_cmd(9), comedi_bytes_per_scan(9), comedi_nscans_left(9), comedi_nsamples_left(9), comedi_inc_scan_progress(9), comedi_load_firmware(9), __comedi_check_request_region(9), comedi_check_request_region(9), comedi_legacy_detach(9), comedi_auto_config(9), comedi_auto_unconfig(9), comedi_driver_register(9), comedi_driver_unregister(9)

like, the whole squad. go read 'em 💖

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ngl bestie, if those "end of acquisition", "error", or "overflow" flags are set, s->cancel is getting called — that's the documented behaviour, not a drill 💀

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okay that's the page, love u, bye 💜 — this one came from ./drivers/comedi, October 2026, mwah 🎀🌸