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21 lines
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.. meta::
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:description: Synchronous read and write API reference for hipFile, covering hipFileRead, hipFileWrite, and the hoff_t offset type.
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:keywords: hipFile, ROCm, synchronous I/O, hipFileRead, hipFileWrite, hoff_t, GPU I/O, API reference
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*****************************************
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Synchronous read and write API reference
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*****************************************
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``hipFileRead`` and ``hipFileWrite`` perform blocking transfers between a file and registered GPU memory. Both functions accept file and buffer offsets for fine-grained control over where data is read from or written to.
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Before calling these functions, register the file handle with ``hipFileHandleRegister`` and the GPU buffer with ``hipFileBufRegister``. See :doc:`/reference/api-file-and-buffer` for registration details and :doc:`/tutorials/copy-a-file` for a usage walkthrough.
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Offset type and functions
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==========================
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The offset type used by the synchronous read and write functions, and the
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functions themselves.
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.. doxygengroup:: sync
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:content-only:
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