RTAS(2)

💖 RTAS(2) — the glow-up edition 💖

ok bestie, welcome to RTAS(2), straight outta the System Calls Manual. section 2, we're in syscall territory, and this one is a whole vibe. let's get into it 🦋

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✨ NAME ✨

rtas — Allows userspace to call RTAS (Run Time Abstraction Services)

no cap, that's literally the whole job description.

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🌸 SYNOPSIS 🌸

int ppc_rtas (struct rtas_args *uargs);

one function, one struct pointer, main character energy fr fr.

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💅 DESCRIPTION 💅

okay so, ppc_rtas is the lil doorway that lets userspace do its own manipulation of the RunTime Abstraction Services (aka RTAS, iykyk).

and what is RTAS for? it provides for a portable method of access and setting system information. like, for example, you could gather information on various system sensors, and set poweron values. very demure, very mindful, very portable. 💖

RTAS is accessed via the /proc entry called "rtas". and the manipulations on RTAS? they're implemented via command line arguments on /proc/rtas. yes bestie, /proc/rtas, that's the one.

heads up though — the values for uargs vary greatly. like, wildly. so if you need more info, go see the view/arch/ppcKconfig file. that's where the lore lives 📖✨

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🫶 RETURN VALUE 🫶

rtas returns 0 on success 🎀 otherwise it returns one of the errors listed in the "Errors" section. so basically zero = slay, anything else = read the next section babes.

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😭 ERRORS 😭

• -EPERM — User does not have CAP_SYS_ADMIN capabilities. not you without the right permissions 💀
• -EFAULT — Problem copying uargs values to/from user space. the copy just didn't copy, and honestly? relatable.
• -EINVAL — Either number of uargs passed in too large or size of uargs array too large. too much of a good thing, bestie. it's giving overpacked suitcase 🧳

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👑 AUTHOR 👑

Niki Rahimi. periodt. 💜

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that's the whole page bestie, you ate it up 🌈⭐ and just so you know, this was the RTAS(2) page from the System Calls Manual — go be iconic with your /proc/rtas calls, ily 🎀💖🦋