xxhash(9)

✨ xxhash(9) ✨

okay bestie, so this is a page from the Kernel API Manual and it's literally all about xxhash — the little function that hashes your stuff 💅

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🌸 NAME 🌸

xxhash — calculates a wordsize hash of the input, with a seed you get to pick 🎀

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🦋 SYNOPSIS 🦋

unsigned long xxhash (const void *input , size_t length , uint64_t seed );

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💖 ARGUMENTS 💖

• input — the data you wanna hash. that's it, that's the vibe 🫶
• length — how long that data is, in case you were wondering how much of it there is ✨
• seed — a seed! you can use it to alter the result predictably, so like, on purpose and repeatably, not in a chaos way 😌

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🔥 DESCRIPTION 🔥

so here's the tea: if your hash does not need to be comparable between machines with different word sizes, this function will call whichever of xxh32 or xxh64 is faster ⚡ like it literally picks the speedy one for you, main character energy fr fr 👑

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🌈 RETURN 🌈

it hands you back a wordsize hash of the data — that's the whole gift 🎁

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👑 SEE ALSO 👑

• Kernel file ./include/linux/xxhash.h
• xxh32(9)
• xxh64(9)
• struct xxh64_state(9)
• xxh64_reset(9)
• xxh64_update(9)
• xxh64_digest(9)

go read those too bestie, they're the rest of the friend group 💜

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and that's the whole page!! sign-off szn: this one lives in ./include/linux, dated October 2026, from the Kernel API Manual — mwah, slay, periodt 💅💖🦋