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X and C (Pointer and ReceiveList) descriptors are backed by the "pointer buffer", a buffer in the service process. Its size is a u16, which is retrieved using the "QueryPointerBufferSize" control message. If the client code determines all buffers with flag 8 do not fit in the pointer buffer, it returns error 0x11A0B.

X and C (Pointer and ReceiveList) descriptors are backed by the "pointer buffer", a buffer in the service process. Its size is a u16, which is retrieved using the "QueryPointerBufferSize" control message. If the client code determines all buffers with flag HipcPointer do not fit in the pointer buffer, it returns error 0x11A0B.

For buffers with flag 0x20 it creates two descriptors (A+X or B+C), but one descriptor is NULL (zero size and pointer), while the other holds the expected values. X/C descriptors are used as the non-NULL descriptor where possible, but if they don't fit in the pointer buffer, A/B descriptors are used instead. The code defers processing of type 0x20 buffers with sizes that fit in a u16 (and may therefore fit in the pointer buffer), which ensures all type 8 buffers get pointer-buffer space before any type 0x20. The order in which the deferred type 0x20 buffers are processed is determined by a convoluted loop.

For buffers with flag HipcAutoSelect it creates two descriptors (A+X or B+C), but one descriptor is NULL (zero size and pointer), while the other holds the expected values. X/C descriptors are used as the non-NULL descriptor where possible, but if they don't fit in the pointer buffer, A/B descriptors are used instead. The code defers processing of HipcAutoSelect buffers with sizes that fit in a u16 (and may therefore fit in the pointer buffer), which ensures all HipcPointer buffers get pointer-buffer space before any HipcAutoSelect. The order in which the deferred HipcAutoSelect buffers are processed is determined by a convoluted loop.

== Official IPC Cmd Structure ==

== Official IPC Cmd Structure ==