liveupdate_register_flb(9)

💅 liveupdate_register_flb — a kernel API manual, but make it make sense

okay so bestie, welcome to the liveupdate_register_flb(9) page from the Kernel API Manual. This is the one where you introduce your File-Lifecycle-Bound object to its file handler and then make it official with the whole system. Very "meet the parents" energy, honestly. 🎀

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✨ NAME ✨

liveupdate_register_flb — the function that associates an FLB with a file handler and registers it globally. Basically matchmaking, but for kernel objects, and the relationship is a dependency. 🫶

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✨ SYNOPSIS ✨

int liveupdate_register_flb (struct liveupdate_file_handler *fh , struct
liveupdate_flb *flb );

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✨ ARGUMENTS ✨

• fh — the file handler that will now depend on the FLB. she's the one taking on a whole new responsibility, lowkey.
• flb — the File-Lifecycle-Bound object you're associating. your little main character. 🌟

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✨ DESCRIPTION ✨

So here's the vibe: this call establishes a dependency, and it informs the LUO core that whenever a file of type fh is preserved, the state of flb must also be managed. like, they're a package deal now. no cap. 💫

On the first registration of a given flb object, it gets added to a global registry. iconic behavior, truly.

And this function is not out here being naive — it checks for duplicate registrations, both for a specific handler and globally, and it makes sure the total number of unique FLBs does not exceed the system limit. she does her homework. 📋✨

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✨ CONTEXT ✨

Typically called from a subsystem's module init function, after both the handler and the FLB have been defined and initialized. so like, don't show up to the party before the party exists, yk? timing is everything. 🕐

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✨ RETURN ✨

• 0 on success. slay. 💖
• Returns a negative errno on failure:
  • -EINVAL — if arguments are NULL or not initialized. (rude, but fair.)
  • -ENOMEM — on memory allocation failure. 😭
  • -EEXIST — if this FLB is already registered with this handler. bestie they've met. 🙈
  • -ENOSPC — if the maximum number of global FLBs has been reached. the club is at capacity. 💀
  • -EOPNOTSUPP — if live update is disabled or not configured.

Quick vibe check: those failure codes are not decorative. check them, fr fr. 🔥

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✨ SEE ALSO ✨

• Kernel file ./kernel/liveupdate/luo_flb.c
• LUO File Lifecycle Bound Global Data(9)
• luo_flb_file_preserve(9)
• luo_flb_file_unpreserve(9)
• luo_flb_file_finish(9)
• luo_flb_unregister_all(9)
• liveupdate_unregister_flb(9)
• liveupdate_flb_get_incoming(9)
• liveupdate_flb_get_outgoing(9)
• luo_flb_serialize(9)

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anyway that's the whole page, you ate it up honestly 👑. this little number lives at ./kernel/liveupdate, datestamped October 2026, and it's part of the liveupdate_register_flb(9) family of docs — go read the SEE ALSO gang next, they're all linked and ready. mwah 💋🌸