bm_entry_add_interp(9)

✨ bm_entry_add_interp(9) ✨

okay so bestie, welcome to the Kernel API Manual page for bm_entry_add_interp 💅 — it's the one that binds another interpreter to a staged entry, and honestly? iconic behavior.

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🎀 SYNOPSIS 🎀

ssize_t bm_entry_add_interp (struct binfmt_misc_entry *e , struct file
*file , char *buf , size_t count );

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🌸 ARGUMENTS 🌸

• e — the entry. the main character, literally.
• file — the entry file being written to, and we're pulling its credentials from it. so it's not just there for vibes 🫶
• buf — the '+<name> <path>' command. it gets parsed in place and it's owned by the caller, so don't come for it afterwards, okay? 🙈
• count — its length. the size. the measure. the moment 📏✨

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💖 DESCRIPTION 💖

so here's the tea ☕ — a 'D' entry is registered outside the search list, and that is literally the whole reason it's open to being configured. it can't be matched, so no exec can be holding its interpreters, and the set can still grow. it's giving "backstage pass" energy 💅

its first enable publishes it, and that ends that. one and done. periodt 🔥

one interpreter per write, up to BINFMT_MISC_INTERP_MAX of them — and ngl? none of them has to fit in a register string. not a single one. we love a flexible queen 👑

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⭐ RETURN ⭐

count on success, a negative errno on failure. slay when it works, sad little negative number when it doesn't 😭

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🦋 SEE ALSO 🦋

okay this list is LONG and we're getting through all of it, no skipping bestie 🫶

Kernel file ./fs/binfmt_misc.c, plus: struct binfmt_misc_flag(9), search_binfmt_handler(9), get_binfmt_handler(9), binfmt_misc_find_interp(9), entry_attach_interpreter(9), put_binfmt_handler(9), current_binfmt_misc(9), entry_select_interpreter(9), entry_invocation_flags(9), entry_open_interpreter(9), build_interp_argv(9), i_binfmt_misc(9), bm_evict_inode(9), unlink_binfmt_handler(9), remove_binfmt_handler(9), bm_unlink(9)

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and that's the whole page, bestie!! 💜 this little gem lives over in ./fs and the version vibes are dated October 2026 — so go forth, add those interpreters, and remember: one per write, up to BINFMT_MISC_INTERP_MAX, no cap 🧚✨🌸