sg_copy_buffer(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sg_copy_buffer — bestie's guide to shuttling bytes between a linear buffer and an SG list ✨

okay so this one is from the Kernel API Manual (that's the manual name, keep up 🫶), and honestly? it's a lil workhorse. It copies data between a boring flat linear buffer and a fancy scatterlist (SG) list. That's it. That's the whole vibe. No cap.

🌸 SYNOPSIS 🌸

size_t sg_copy_buffer (struct scatterlist *sgl , unsigned int nents ,
       void *buf , size_t buflen , off_t skip , bool to_buffer );

🎀 ARGUMENTS 🎀

  • sgl — the SG list, aka the main character of this whole operation 🫶
  • nents — how many SG entries there are (count 'em)
  • buf — where to copy from
  • buflen — the number of bytes to copy (yes, exactly this many, no more no less 💅)
  • skip — how many bytes to skip before we start copying. like scrolling past the intro, iykyk
  • to_buffer — the transfer direction, and it's literally just a bool:
    • true == from an sg list to a buffer
    • false == from a buffer to an sg list

💖 DESCRIPTION 💖

Returns the number of copied bytes. that's the whole bit — the return value is your count, periodt. ⭐

lowkey obsessed with how this function just does the thing and tells you how many bytes it did it to. no drama, no notes. 🔥

👑 SEE ALSO 👑

Kernel file ./lib/scatterlist.c, plus this whole friend group of scatterlist functions (all (9) section, obviously — kernel internals only 💅):

like… the whole extended universe fr fr 🌈

✨ anyway bestie that's the page!! live from ./lib, dated October 2026 — catch you in the next scatterlist 💜🦋🎀

📦 where this page comes from