gpiochip_dup_line_label(9)

📦 version 7.3.1, in nixpkgs unstable

💅 gpiochip_dup_line_label(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: you're deep in gpio land (the kernel API manual kind of deep), and you just need a copy of the consumer label for one specific line. That's this function. She's little, she's useful, she hands you a string you now own and must free. Slay. ✨

✨ NAME ✨

gpiochip_dup_line_label — Get a copy of the consumer label.

🦋 SYNOPSIS 🦋

char * gpiochip_dup_line_label (struct gpio_chip *gc , unsigned int
offset );

🌸 ARGUMENTS 🌸

  • gc — the GPIO chip controlling this line. like, the owner of the whole situation.
  • offset — the hardware offset of the line. which one we're looking at. 👑

⭐ RETURN ⭐

Pointer to a copy of the consumer label if the line is requested, or NULL if it's not. 🫶

And listen — if a valid pointer came back, it must be freed using kfree. Not optional, not "eh I'll get to it". That's your pointer now, bestie, take care of it. 💀

In case of a memory allocation error, the function returns ENOMEM.

💜 DESCRIPTION 💜

Must not be called from atomic context. fr fr. that's the whole description and it's giving boundaries. 🙈

🔥 SEE ALSO 🔥

The kernel file ./drivers/gpio/gpiolib.c, plus literally the entire extended friend group:

like. the whole roster. iykyk 💅

lowkey reminder bestie: not from atomic context, and kfree that pointer. that's the vibe check. 🍓

and that's the page!! brought to you from ./drivers/gpio, dated October 2026, signed off by gpiochip_dup_line_label(9) herself — periodt. 🧚‍♀️💖🌈⭐👑

📦 where this page comes from