STRUCT RETHOOK(9)

💅 struct rethook(9) — the kernel API manual, but make it make sense

okay so bestie, this is struct rethook from the Kernel API Manual ✨ it's literally the rethook management data structure, and we're gonna get into it 🫶

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🌸 NAME 🌸

struct rethook — The rethook management data structure. that's it, that's the whole vibe 💖

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✨ SYNOPSIS ✨

struct rethook {
    void *data;
    void (*handler) (struct rethook_node *, void *, unsigned long,
struct pt_regs *);
    struct objpool_head     pool;
    struct rcu_head         rcu;
 };

like, look at her. she's gorgeous. she's a handful. let's go member by member 👑

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🎀 Members 🎀

• data — the user-defined data storage. ur lil spot to keep ur own stuff, no questions asked 💅
• handler — the user-defined return hook handler. this is the callback that actually does the thing when the hook fires 🔥
• pool — the pool of struct rethook_node. where all the node girlies hang out 🌸
• rcu — the rcu_head for deferred freeing. freeing, but make it delayed, courtesy of RCU 😌

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🦋 Description 🦋

real talk: don't embed this into another data structure. ngl, this is a self-destructive data structure once all rethook_node are freed 💀 like it will absolutely take itself out, so keep it standalone, okay? no cap.

bestie pls. not embedded. i'm begging 🙈 this one is literally self-destructive when all rethook_node are freed — that's the whole reason, fr fr.

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🌈 SEE ALSO 🌈

• Kernel file ./include/linux/rethook.h — struct rethook_node(9), is_rethook_trampoline(9) 👀

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aaaand that's the page, main character energy from start to finish 👑 mwah 💋 this one shipped out of ./include/linux, dated October 2026 — so yeah, mark ur calendars, bestie 🎀✨