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Re: 1.7.8: write fails with EAGAIN
tested with cvs HEAD:
Just terminating the loop after write_overlapped_fallback is not enough.
When the size to write exceeds MAX_OVERLAPPED_WRITE_LEN and WriteFile
fails for MAX_OVERLAPPED_WRITE_LEN, write() will always return 0.
Now any write with length > MAX_OVERLAPPED_WRITE_LEN fails with -1 /
EFBIG (on the machine that has the WriteFile limitation).
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