register_ne...notifier_net(9)

📦 version 7.3.1, in nixpkgs unstable

💖 register_ne...notifier_net(9) 💖

okay bestie, so this is a page straight out of the Kernel API Manual and it's genuinely so good — we're talking about register_netdevice_notifier_net, the little function that gives you a per-netns</> network notifier block. yes, per-netns, she's namespace-aware, we love that for her ✨

🌸 NAME 🌸

register_netdevice_notifier_net — register a per-netns network notifier block 🫶

⭐ SYNOPSIS ⭐

int register_netdevice_notifier_net (struct net *net , struct
notifier_block *nb );

🎀 ARGUMENTS 🎀

  • net — the network namespace 🦋 (yep, your netns, your rules)
  • nb — the notifier 💅

🔥 DESCRIPTION 🔥

So here's the vibe: you register a notifier to be called when network device events occur. the notifier you pass in gets linked straight into the kernel structures, and — this is important, bestie, listen — it must not be reused until it has been unregistered. no cap. and if something goes wrong? you get a negative errno code back on a failure. 😭

When it's registered, all registration and up events are replayed to the new notifier, which lets the device have a race free view of the network device list. like it literally catches you up on everything you missed, it's giving main character energy 🧚

ngl, that "don't reuse it until unregistered" part is the whole ballgame. mess with it and the kernel will be very not slay about it 💀

🌈 SEE ALSO 🌈

Kernel file ./net/core/dev.c — and honestly the whole squad, here she is, the full lineup, no skips, no cuts, periodt 👑

and that's the whole page, babe 🍓 she lives in ./net/core, dated October 2026, and this absolute icon is filed under register_ne...notifier_net(9). go forth and register responsibly 💜💫

📦 where this page comes from