Add hio_sendfile() API for zero-copy file transfer using sendfile(2)#821

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Copilot wants to merge 3 commits into

copilot/implement-sendfile-zero-copy

Commits on Mar 23, 2026

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Copilot
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Add hio_sendfile() API for zero-copy file transfer using sendfile(2)

Copilot
and
ithewei
committed
Address code review: add fd validation, fix partial write handling, improve error messages

Copilot
and
ithewei
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