tomoyo_file_open(9)

📦 version 7.3.1, in nixpkgs unstable

💅 tomoyo_file_open(9) — a Kernel API Manual moment

okay so bestie, we're in the Kernel API Manual today and the star of the show is tomoyo_file_open(9). yes it's a whole LSM thing, yes it's iconic, let's get into it 🎀

✨ NAME ✨

tomoyo_file_open — literally the target for security_file_open(). that's it, that's the vibe 🦋

🌸 SYNOPSIS 🌸

int tomoyo_file_open (struct file *f );

🧚 ARGUMENTS 🧚

  • f — a pointer to struct file. just a lil pointer, no big deal, she's pointing at a file structure and she knows it 💅

🔥 DESCRIPTION 🔥

so what does she do? she returns 0 on success ✨ and a negative value otherwise 😭 that's the whole tea, no cap.

like, that's genuinely it. short queen behavior. we love a function that knows what she is and doesn't over-explain 🫶

ngl this is a security hook, so "negative value otherwise" means something went sideways — treat that negative return like a red flag in the group chat, bestie 💀

👑 SEE ALSO 👑

okay this is the part where she introduces you to her entire friend group. they're all (9) pages, they're all TOMOYO, and yes you will be meeting all of them 🌈

the kernel file to peek at is ./security/tomoyo/tomoyo.c — start there, iykyk 🍓

and then, in no particular order, the whole squad:

and that's the page, bestie ✨ this lil masterpiece lives in ./security/tomoyo, it's dated October 2026, and its whole full name is tomoyo_file_open(9) — go forth and security_file_open() responsibly 💖🎀🦋

📦 where this page comes from