devm_kasprintf(9)

📦 version 7.3.1, in nixpkgs unstable

💖 devm_kasprintf — the Kernel API Manual, bestie edition 💖

okay so welcome to the Kernel API Manual page for devm_kasprintf, and honestly? she's giving "I format strings AND I clean up after myself" energy. devm = device-managed, and that's the whole slay: allocate some resource-managed space and format a string right into it. 🎀

✨ NAME ✨

devm_kasprintf — Allocate resource managed space and format a string into that.

Like, she mallocs for you, she prints for you, and she frees it automatically when the device dips. main character behaviour fr fr. 💅

🌸 SYNOPSIS 🌸

char * devm_kasprintf (struct device *dev , gfp_t gfp , const char *fmt , ... );

look at her. iconic signature. no notes. ✨

🦋 ARGUMENTS 🦋

  • dev — Device to allocate memory for. like, whose little memory budget is this coming out of? that device. 🫶
  • gfp — the GFP mask used in the devm_kmalloc call when allocating memory. yes bestie, the exact same mask, passed straight through to devm_kmalloc. 🌈
  • fmt — The printf-style format string. the blueprint, the vision, the ~aesthetic~ of your string. 🎀
  • ... — Arguments for the format string. the little guys that get slotted into the fmt holes. 💜

👑 RETURN 👑

Pointer to allocated string on success, NULL on failure.

that's it. that's the tea. check for NULL, always, no cap. 😭

💀 SEE ALSO 💀

Kernel file ./drivers/base/devres.c — and then the entire devres friend group, like a whole group chat of resource-managed besties:

go read them. all of them. iykyk. 📚

and that's the page!! this one lives in ./drivers/base, and the doc fairies dated it October 2026 — so when you're skimming kernel docs in the future, you'll know exactly who wrote this little masterpiece. mwah 💋 bye bestie, go format some strings responsibly 🧚‍♀️✨

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