wdrtas_temp_read(9)

📦 version 7.3.1, in nixpkgs unstable

💅 wdrtas_temp_read — kernel API manual, but make it cute

okay so bestie, welcome to wdrtas_temp_read(9) — yes that's the page header, and yes the manual name is literally in the title, iykyk. this is a kernel API manual page and we're gonna get you through it, no cap 🫶

✨ NAME ✨

wdrtas_temp_read — gives back the temperature in fahrenheit 🌡️

like, that's the whole job. it hands you a temperature. in fahrenheit. iconic behavior honestly.

🌸 SYNOPSIS 🌸

ssize_t wdrtas_temp_read (struct file *file , char __user *buf , size_t
count , loff_t *ppos );

that's the signature, copy it exactly, don't be weird about it 💖

🎀 ARGUMENTS 🎀

  • file — file structure
  • buf — user buffer
  • count — number of bytes to be read
  • ppos — position in file

four args, all accounted for, slay ✨

🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — wdrtas_temp_read gives the temperature to the users by copying this value as one byte into the user space buffer. one byte. that's it. that's the whole vibe. 💀

and the unit? Fahrenheit… yes, Fahrenheit, with the little ellipsis, don't @ me, that's what the page says 🌈

now the return values, pay attention bestie:

  • returns always 1, or -EFAULT in case of user space copy failures
  • <0 on other failures

so like, if the copy to userspace flops, you get -EFAULT. anything else goes wrong, you get some negative number and it's giving "not my problem, read the errno" energy 😭

fr fr do not forget: the successful return is 1, not count, not 0. one byte out, 1 back. periodt.

👑 SEE ALSO 👑

Kernel file ./drivers/watchdog/wdrtas.c — and the whole friend group:

every single one, no skipping, we don't do that here 💅

and that's the page!! source/version vibes come from ./drivers/watchdog, dated October 2026, and the page is wdrtas_temp_read(9) — mwah, go read your temperatures responsibly bestie 🧚💜🎀

📦 where this page comes from