comedi_event(9)

💅 comedi_event(9) — the Kernel API Manual page, bestie edition 🎀

okay so first things first: this is comedi_event(9), straight out of the Kernel API Manual, and it's literally the little function that handles events for your asynchronous COMEDI command. yes queen, it's a 9 — kernel-section energy only. 🦋

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✨ NAME ✨

comedi_event — handle events for asynchronous COMEDI command 🫶

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✨ SYNOPSIS ✨

void comedi_event (struct comedi_device *dev , struct comedi_subdevice
*s );

no cap, that's the whole signature. two pointers in, nothing back out. void said "I don't return, I serve." 💅

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✨ ARGUMENTS ✨

• dev — the COMEDI device. you know, the whole aesthetic. 🎀
• s — the COMEDI subdevice. the specific little corner of the device we're doing the vibe check on.

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✨ CONTEXT ✨

so where are you allowed to call this? it's in_interrupt (usually — like, usually, not always, don't @ me), and the s->spin_lock spin-lock is not held.

⚠️ read that again bestie: spin-lock not held. this function is not your moment to be holding locks, fr fr.

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✨ DESCRIPTION ✨

here's the tea ☕ — if an asynchronous COMEDI command is active on the subdevice, this function goes through any COMEDI_CB_... event flags that have been set, and those flags are usually set by an interrupt handler. 🔥

and what do those flags actually do? they may:

• change the run state of the asynchronous command 🔄
• wake a task 😴➡️😳
• and/or send a SIGIO signal 📣

so basically: flags go in, state changes / tasks wake up / signals fly out. iconic. 💜

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✨ SEE ALSO ✨

the whole friend group, no gatekeeping:

• 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_get_is_subdevice_running(9)
• comedi_put_is_subdevice_running(9)
• comedi_set_spriv_auto_free(9)
• comedi_alloc_spriv(9)
• get_valid_routes(9)

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aaaand that's the page!! 🎀 one last vibe check for the sign-off: this whole thing lives under ./drivers/comedi, and it's dated October 2026, with the manual name being comedi_event(9) in case you forgot already. go forth and handle those events, bestie — slay 💅✨🌈