build_id_parse(9)

✨ NAME ✨

okay so bestie 💖 welcome to build_id_parse(9), straight out of the Kernel API Manual. This is the function that parses the build ID of an ELF file mapped to a VMA, and we're gonna get you comfy with every single detail, no cap.

build_id_parse — Parse build ID of ELF file mapped to VMA

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🌸 SYNOPSIS 🌸

int build_id_parse (struct vm_area_struct *vma , unsigned char *build_id
, __u32 *size );

that's the whole signature, periodt. 👑

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🎀 ARGUMENTS 🎀

• vma — the vma object, your main character here 🫶
• build_id — buffer to store build id, at least BUILD_ID_SIZE long
• size — returns actual build id size in case of success

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🦋 DESCRIPTION 🦋

Assumes faultable context and can cause page faults to bring in file data into page cache. like yes bestie, it's giving "I need a faultable context" energy, and it can absolutely cause page faults to bring that file data into the page cache. 💅

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💅 RETURN 💅

0 on success; negative error, otherwise. slay when it works, sad little negative number when it doesn't 😭

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🌈 SEE ALSO 🌈

• Kernel file ./lib/buildid.c
• build_id_parse_nofault(9)
• build_id_parse_file(9)
• build_id_parse_buf(9)
• init_vmlinux_build_id(9)

go read these too, iykyk 💜

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mwah 💋 that's the whole page, bestie — source/version is ./lib, dated October 2026, and we're out here shipping build_id_parse(9) with all the facts intact. 🎀✨