xxh64_update(9)

💖 xxh64_update(9) 💖

okay so bestie, welcome to the Kernel API Manual 💅 we’re talking about xxh64_update(9) today, and it’s literally the “hash the data and update the state” girlie. no cap.

🌸 NAME 🌸

xxh64_update — hash the data given and update the xxh64 state. periodt.

✨ SYNOPSIS ✨

here’s the signature, keep it exact bestie:

int xxh64_update (struct xxh64_state *state , const void *input , size_t
       length );

🎀 ARGUMENTS 🎀

• state — the xxh64 state to update. she’s the main character here 💅
• input — the data to hash. give her the goods.
• length — the length of the data to hash. gotta know how much data we’re working with.

🦋 DESCRIPTION 🦋

after you call xxh64_reset, call xxh64_update as many times as necessary. that’s the flow, bestie — reset, then update as many times as necessary. iykyk ✨

⭐ RETURN ⭐

Zero on success, otherwise an error code. slay if it’s zero; otherwise bestie you got an error code 😭

🌈 SEE ALSO 🌈

the whole squad lives here:

• Kernel file: ./include/linux/xxhash.h
• xxh32(9)
• xxh64(9)
• xxhash(9)
• struct xxh64_state(9)
• xxh64_reset(9)
• xxh64_digest(9)

okay bye bestie 🫶 this page comes from source/version ./include/linux and is dated October 2026 ✨💖