Description:
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copy("/dev/stdin","/tmp/xx"); was working in 4.0.6 but in
4.3.3 it results in empty file. When I ran strace then I see
fstat64(2) used on handle 4 which is dup(2)ed from handle 0.
It results to fs_size==0 and code in php_stream_copy_to_stream
(IIRC) hapily creates zero-sized file (immeditely - no wait for EOF).
With PHP fopen() it works as expected (it waits).

Reproduce code:
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copy("/dev/stdin","/tmp/xx");

Expected result:
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to stop on copy() and wait to EOF and then have input in /tmp/xx

Actual result:
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copy() passes and /tmp/xx is zero-length file