avc_add_callback(9)

📦 version 7.3.1, in nixpkgs unstable

💅 avc_add_callback(9) — like, the Kernel API Manual era 🫶

okay so bestie, strap in, because this one is short and sweet but it's literally all about registering a callback for security events and honestly? iconic behaviour. this is a page from the avc_add_callback(9) end of the Kernel API Manual, and yes we are absolutely gonna read it together 💖

✨ NAME ✨

avc_add_callback — Register a callback for security events.

like. that's the whole vibe. you're signing a function up to get pinged when security stuff goes down. no cap. 👑

🌸 SYNOPSIS 🌸

int avc_add_callback (int (*callback)(u32 event) , u32 events );

copy it exactly, bestie, character for character, because the compiler does not accept vibes as an argument 😭

🎀 ARGUMENTS 🎀

  • callback — the callback function itself. your little guy. the function that gets called. it takes a u32 event. slay.
  • events — the security events. this is the set of events you're registering for, so think of it as the guest list for your callback's party 💌

🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — you call this and it registers a callback function for events in the set events. one function, one set of events, one beautiful little agreement between you and the kernel 🤝

and the returns? very demure, very mindful:

  • returns 0 on success ✨
  • returns -ENOMEM if insufficient memory exists to add the callback 💀

that's it. that's the whole function. lowkey obsessed with how straightforward this is. no hidden lore, no surprises, just memory permitting and you're in 💜

ngl, if you get -ENOMEM back it's not a you problem, it's a memory problem. the kernel just didn't have enough room to add your callback. respect the boundary 🙈

🔥 SEE ALSO 🔥

the whole friend group, fr fr — these all live in the kernel file ./security/selinux/avc.c:

go read them all, i'll wait 💅

mwah 💋 that's the page!! brought to you by the fine people at ./security/selinux, dated October 2026, and of course the star of the show herself, avc_add_callback(9). 🧚‍♀️⭐

📦 where this page comes from