smack_file_send_sigiotask(9)

📦 version 7.3.1, in nixpkgs unstable

💅 smack_file_send_sigiotask — like, the Kernel API Manual page bestie 🎀

okay so picture this: it's giving kernel security module realness, and this page is literally the whole vibe. it's smack_file_send_sigiotask(9) and she is that girl. no cap. ✨

🌸 NAME 🌸

smack_file_send_sigiotask — Smack on sigio 🦋

literally the entire name, that's it, that's the brand.

✨ SYNOPSIS ✨

int smack_file_send_sigiotask (struct task_struct *tsk , struct
fown_struct *fown , int signum );

yeah she takes three args and returns an int, iconic behaviour only 💅

🎀 ARGUMENTS 🎀

  • tsk — The target task 🎯 like, the one who's getting the signal, main character energy fr
  • fown — the object the signal come from 🫶 (yes king, that's the file owner struct, it's where the drama starts)
  • signum — unused 😭 literally just sitting there, not doing a single thing, we respect her anyway

💖 DESCRIPTION 💖

okay so the whole point: Allow a privileged task to get signals even if it shouldn't 🔥 like, normally the rules would say no but this function says "hm, actually, let her through." privileged behaviour. we love to see it. 👑

Returns 0 if a subject with the object's smack could write to the task — that's the happy path bestie, 0 means slay ✅ — and an error code otherwise 💀 so like, any other number means nope, not today, the Smack check said no.

bestie pls notice: the zero-vs-error thing is the ENTIRE contract, don't be out here assuming nonzero means anything specific beyond "it didn't pass" 🙈

🦋 SEE ALSO 🦋

Kernel file ./security/smack/smack_lsm.c — and honestly the whole extended family, they're all here, I'm not skipping a single one because every link deserves her moment 🌈

and that's the whole page, bestie, we ate and left absolutely zero crumbs 🍓

source/version, as promised: this one lives in ./security/smack 💜

dated October 2026 — yeah she's from the future, we don't question it, we just stan 🧚✨

📦 where this page comes from