apple_smc_write_atomic(9)

okay so bestie, welcome to the apple_smc_write_atomic(9) page from the Kernel API Manual — it's literally about writing into an SMC key, and we're gonna get you through it 💅✨

💖 NAME 💖

apple_smc_write_atomic — write size bytes into the given SMC key from buf without sleeping 🫶

✨ SYNOPSIS ✨

int apple_smc_write_atomic (struct apple_smc *smc , smc_key key , const
       void *buf , size_t size );

🌸 ARGUMENTS 🌸

• smc — Pointer to apple_smc struct
• key — smc_key data will be written to
• buf — Buffer from which size bytes of data will be written to SMC
• size — Number of bytes to be written

🦋 DESCRIPTION 🦋

okay so quick vibe check, bestie: this function will fail if apple_smc_enter_atomic hasn't been called before. that's the note, and it's lowkey important 👀

🔥 RETURN 🔥

Zero on success, negative errno on error. periodt 💅

🌈 SEE ALSO 🌈

Kernel file ./include/linux/mfd/macsmc.h plus these iconic references:

• smc_key(9)
• SMC_KEY(9)
• struct apple_smc_key_info(9)
• enum apple_smc_boot_stage(9)
• struct apple_smc(9)
• apple_smc_read(9)
• apple_smc_write(9)
• apple_smc_enter_atomic(9)
• apple_smc_rw(9)
• apple_smc_get_key_by_index(9)
• apple_smc_get_key_info(9)
• apple_smc_key_exists(9)

mwah 💋 — source/version line says ./include/linux/mfd, the date is October 2026, and the page is apple_smc_write_atomic(9) 🎀