Take main's restored signatures (the firmware-database sweep of 2026-10-21):
the typed UsbStorageCallback across the register/unregister family, the
UsbStorageDeviceInfo-typed device-info query, IsExist's three-argument bool
form (succeeds and reports non-existence with no device attached), and
RequestMap's six parameters with the trailing reserved pair dropped. The
no-device answers and the argument validation are unchanged; the guest test
passes an APS5_VABI callback and pins the exists out-parameter.
Nine of the twenty-one exports implement the no-device path: the lifecycle
pair accepts every call and keeps no state, the device queries answer the
empty list, the not-exists 0 and the device-not-found error, the map
requests answer device-not-found with their outputs untouched, and the
getdents family answers device-not-found on open and not-supported with
zero bytes on the read of a never-opened descriptor. The argument
validation of the register, unregister, unmap and getdents-close exports
is implemented and answers 0x80f40002; past it they keep their markers,
because no reference establishes their success path. The device-info
record and two prototypes follow SharpProspero, the rest shadPS4, each
pinned in the debt entry.
boykopovar