DEVICE_GET_DEVCLASS(9)

💖 DEVICE_GET_DEVCLASS 💖

okay bestie, so this is a page from the Kernel Developer's Manual (section 9, iykyk) and it's literally the tiniest little bop — one function, in and out, no drama. ✨

🌸 NAME 🌸

device_get_devclass — access the devclass of a device

like... it gets you the devclass. of a device. that's the whole vibe. 🎀

✨ SYNOPSIS ✨

first you gotta pull in the headers, no skipping:

#include <sys/param.h>
#include <sys/bus.h>

and then the moment we've all been waiting for:

devclass_t
device_get_devclass(device_t dev);

look at her. she's iconic. she takes one device_t dev and she gives you back a devclass_t. that's it. that's the function. 💅

🦋 DESCRIPTION 🦋

okay so here's what's happening: device_get_devclass returns the current devclass that's associated with the device. like, whatever devclass that device is vibing with right now? that's what you get back. simple. clean. no cap. 💖

but — and this is the important bit, don't skip it — if the device has no devclass, then NULL is returned. not an error, not a crash, just NULL. so fr fr, check your return value before you go using it, bestie. 😭

lowkey a "no devclass" situation is just a thing that can happen, and the function handles it by handing you NULL. that's not a bug, that's the documented behaviour. periodt.

👑 SEE ALSO 👑

• devclass(9)
• device(9)

go read those too, they're the supporting cast and they ate. 🔥

🌈 AUTHORS 🌈

this manual page was written by Doug Rabson. thank you Doug, you legend, we appreciate you 🫶

and that's the whole page, bestie!! short, sweet, and honestly kind of a serve for how small it is. now go forth and get those devclasses. mwah 💋

this lil cutie comes from the Debian distro, dated June 16, 1998 — yeah she's vintage, she's been serving the kernel girlies since before we were born and she's still relevant. slay 💜✨