rio_request_inb_mbox(9)

📦 version 7.3.1, in nixpkgs unstable

💌 rio_request_inb_mbox — inbound mailbox service, but make it official

okay so this is a page from the Kernel API Manual (rio_request_inb_mbox(9), section 9, kernel API girlies rise) and honestly? it's short, it's sweet, it's about claiming your very own inbound mailbox. let's get into it 💖

✨ SYNOPSIS ✨

int rio_request_inb_mbox (struct rio_mport *mport , void *dev_id , int
mbox , int entries , void (*minb) (struct rio_mport * mport, void
*dev_id, int mbox, int slot) );

like, look at that signature. it's giving "five args and a dream" 😭 but every single one matters, so don't skip the next bit.

🌸 ARGUMENTS 🌸

  • mport — the RIO master port you're pulling this mailbox resource out of. your source of truth, your main character port 👑
  • dev_id — a device-specific pointer that gets passed along when the event fires. it's your little "hey, this is me" name tag 🎀
  • mbox — the mailbox number you're claiming. yes, you have to say which one. no, you can't just vibe and hope ✋
  • entries — how many entries live in the inbound mailbox queue. capacity, bestie, know your capacity 🍓
  • minb — the callback that runs when an inbound message shows up. this is the whole point ngl 💅

🦋 DESCRIPTION 🦋

So basically: you call this and you're requesting ownership of an inbound mailbox resource, and you bind a callback function to that resource. that's the deal — the mailbox is yours, and minb is on speed dial for whenever a message comes in.

Return value? 0 on success. that's the only one documented here, so don't go inventing other exit codes, iykyk 🙈

🔥 SEE ALSO 🔥

okay this list is LONG and it's lowkey iconic. all of these hang out in the kernel file ./drivers/rapidio/rio.c:

that's the whole squad fr fr. and yeah — special shoutout to rio_release_inb_mbox(9), the one you'll want when you're done. give it back bestie, don't just hoard it 💀

ngl the whole family lives under ./drivers/rapidio — cute little neighborhood, very demure, very mindful 🌈

and that's the page! written up in October 2026 from the ./drivers/rapidio corner of the kernel, rio_request_inb_mbox(9) style — go claim that mailbox bestie, 0 on success and slay 💅✨🫶

📦 where this page comes from