aa_dfa_null_transition(9)

💅 aa_dfa_null_transition — bestie's guide to the null-character glow-up

okay so real talk, this is a page from the Kernel API Manual (that's the (9) energy, we love a kernel-section moment ✨), and honestly? it's a little niche but it ATE. let's get into it 🎀

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✨ NAME ✨

aa_dfa_null_transition — step to the next state after a null character 🦋

like literally, that's the whole vibe. it's a state transition. after a null. slay.

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🌸 SYNOPSIS 🌸

aa_state_t aa_dfa_null_transition (const struct aa_dfa *dfa , aa_state_t
start );

no cap, that's the exact signature — don't come for me about the line break, that's just how it's written 💅

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🫶 ARGUMENTS 🫶

• dfa — the dfa you're matching against. it's the main character here, the thing you're walking through 👑
• start — the state of the dfa where you're starting the matching. your starting point, your origin story 🌈

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🔥 DESCRIPTION 🔥

so aa_dfa_null_transition transitions to the next state after a null character. periodt.

and here's the tea: that null character is not used in standard matching — it's genuinely only there to separate pairs. so don't get any big ideas about using it for regular matching, because that is not its job and it knows it 🙈

lowkey it's giving backstage-pass energy: it's not out there on the main stage doing standard matching, it's just quietly holding the pairs apart so everything else works. iconic behaviour honestly 💀

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👀 SEE ALSO 👀

you will be clicking through to these, i know you:

• the Kernel file ./security/apparmor/include/lib.h
• aa_strneq(9)
• basename(9)
• __policy_find(9)
• __policy_strn_find(9)

go read them, i'll wait 🍓

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💖 that's the whole page bestie, you're so welcome 💖

cute lil sign-off: this one lives over in ./security/apparmor/include, and it's dated October 2026 — yes, the future, we're ahead of schedule ✨🧚 mwah 💅