usb_find_co...ints_reverse(9)

📦 version 7.3.1, in nixpkgs unstable

✨ usb_find_common_endpoints_reverse (9) ✨

okay bestie, buckle up 💖 this is a page from the Kernel API Manual and it's literally about finding USB endpoints — but like, the last ones. yes, reverse. we're going backwards, and we're slaying while we do it 🦋

🌸 NAME 🌸

usb_find_common_endpoints_reverse — look up common endpoint descriptors, but make it reverse 💅

🎀 SYNOPSIS 🎀

int usb_find_common_endpoints_reverse (struct usb_host_interface *alt ,
struct usb_endpoint_descriptor **bulk_in , struct
usb_endpoint_descriptor **bulk_out , struct usb_endpoint_descriptor
**int_in , struct usb_endpoint_descriptor **int_out );

no cap, that's the whole signature — five args, one int back 🫶

⭐ ARGUMENTS ⭐

  • alt — the alternate setting you wanna search, like the little sub-config bestie you're digging through 🔍
  • bulk_in — a pointer to a descriptor pointer, or NULL (yes, NULL is a whole valid vibe here)
  • bulk_out — pointer to descriptor pointer, or NULL 💫
  • int_in — pointer to descriptor pointer, or NULL 🧚
  • int_out — pointer to descriptor pointer, or NULL 🌈
lowkey the NULL thing matters — every single one of these last four can be NULL and that's fine, no drama 💀

💜 DESCRIPTION 💜

so here's the tea, bestie ☕ — this function goes through the alternate setting's endpoint descriptors and hunts down the last bulk-in, bulk-out, interrupt-in and interrupt-out endpoints. reverse search, main character energy 👑

when it finds them, it hands them back to you through the pointers you provided — unless they're NULL, in which case it just doesn't bother with that one 🙈

and if a requested endpoint just… isn't there? not found? ghosted? 👻 the corresponding pointer gets set to NULL. that's it. that's the whole mood.

🔥 RETURN 🔥

  • 0 — slay, every descriptor you asked for was found ✨
  • -ENXIO — nope, something's missing, and the kernel is telling you with a whole negative errno 😭

🦋 SEE ALSO 🦋

kernel file ./drivers/usb/core/usb.c, plus the whole friend group 🫶:

and that's the page, bestie!! 💅 this little icon lives over in ./drivers/usb/core and it's stamped October 2026 — periodt, see you in the next manpage 🌸✨🎀

📦 where this page comes from