Fixed bug #79000

Don't report EAGAIN/EWOULDBLOCK as errors for fwrite on
non-blocking socket streams. This matches behavior for fread,
as well as behavior for plain file streams.

Fixed bug #79000

Don't report EAGAIN/EWOULDBLOCK as errors for fwrite on
non-blocking socket streams. This matches behavior for fread,
as well as behavior for plain file streams.

Closes GH-5026.

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