build_id_parse_buf(9)

💅 build_id_parse_buf(9) — like, the Kernel API Manual, bestie 🫶

Okay so picture this: it's giving kernel-internals, it's giving ELF notes, and the manual page itself is called build_id_parse_buf(9). We're in the Kernel API Manual today and this one is a little function that scoops a build ID out of a buffer you hand it. Lowkey iconic, ngl. ✨

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🌸 NAME 🌸

build_id_parse_buf — Get build ID from a buffer 💖

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🎀 SYNOPSIS 🎀

int build_id_parse_buf (const void *buf , unsigned char *build_id , u32
buf_size );

Literally that's the whole signature, no cap. 🦋

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✨ ARGUMENTS ✨

• buf — the ELF note section(s) you want parsed. Like, hand it over and let the function do its thing. 🧚
• build_id — this is where the Build ID parsed from buf lands. Heads up though: it has to be at least BUILD_ID_SIZE_MAX long, bestie. Don't skimp on the buffer size or it's gonna be a whole situation. 😭
• buf_size — the size of buf in bytes. Yes it's just the size. Yes you still have to pass it. Periodt. 💅

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🔥 RETURN 🔥

• 0 on success — slay, we ate. 👑
• -EINVAL otherwise — not it, something was off. 💀

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🌈 SEE ALSO 🌈

• The kernel file ./lib/buildid.c — the main character source file, go look at it iykyk
• build_id_parse_nofault(9)
• build_id_parse(9)
• build_id_parse_file(9)
• init_vmlinux_build_id(9)

Read them all fr fr, they're all part of the same little build-ID friend group. 🍓

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⭐ tiny vibe check reminder: build_id must be at least BUILD_ID_SIZE_MAX long — that part is real and important, don't come crying to me when -EINVAL shows up. 🙈

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And that's the page, bestie! 💜 This lil' beauty lives under ./lib, and the version/date stamp on it is October 2026, still filed under build_id_parse_buf(9). Catch you in the next manpage — mwah! 🧚‍♀️💖🎀