range_is_zero(9)

✨ range_is_zero(9) ✨

okay so bestie, welcome to the Kernel API Manual 🎀 — this one's a tiny little function with a huge personality, and we're gonna get into it. no cap. 💅

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💖 NAME 💖

range_is_zero — test whether buffer is initialized 🌸

like, that's the whole vibe check right there. it checks a buffer. that's it. that's the function. 🦋

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⭐ SYNOPSIS ⭐

bool range_is_zero (void *buf , size_t from , size_t to );

literally just three args and a bool coming back at you. iconic signature, no notes. 👑

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🧚 ARGUMENTS 🧚

• buf — the buffer we're checking, bestie. the main character of this whole operation. 🫶
• from — start checking from this position, like, right here. 📍
• to — check up until (excluding!) this position. so to is not invited to the party, it's just where the party ends. 🙈

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🔥 DESCRIPTION 🔥

so the way this works: this function returns true if there is a non-zero byte in buf in the range [from,to). 💀

that's it. that's the tea. a non-zero byte shows up in that range and you get true back. periodt. ✨

also bestie, notice the little ) after to in [from,to) — that bracket is doing something. from is included, to is not. iykyk. 💅

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🌈 SEE ALSO 🌈

• Kernel file ./net/bpf/test_run.c — go read it, it's giving source-of-truth energy. 📖

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and that's the page, bestie!! 🍓 this one lives in ./net/bpf (that's the source, mwah 💜) and the version snuck in a little date of October 2026 — so yeah, she's future-dated and she knows it. ⭐ slay, go check those buffers. 🔥🧚‍♀️🎀