2.2.4 Errors

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All Content Indexing Services Protocol messages MUST return 0x00000000 on success; otherwise, they return a 32-bit nonzero error code that can be either an HRESULT value or an NTSTATUS value (see section 1.8). If a buffer is too small to fit a result, a status code of STATUS_INSUFFICIENT_RESOURCES (0xC0000009A) MUST be returned, after which the failing operation is retried with a larger buffer.

All other error values MUST be treated the same; the error MUST be considered fatal and reported to the higher-level caller. Future messages MAY be sent over the same pipe as if no error had occurred.<12>

Note Currently, the HRESULT and NTSTATUS numbering spaces do not overlap except with values of identical meaning; but, even if there were conflicts in the future, they would not cause any protocol issues as long as the value for STATUS_INSUFFICIENT_RESOURCES remains unique because all other error values are treated the same.