This article was previously published under Q185727
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The _open_osfhandle() function allocates a C run-time file handle and setsit to point to the operating-system file handle. When _open_osfhandle()function is used on a socket descriptor, both _close() and closesocket()should be called before exiting. However, on Windows NT 4.0 Service Pack 3,closesocket() after _close() returns 10038.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
This bug is not present in Windows NT 4.0 Service Pack 1, Service Pack 2,or the original build of Windows NT 4.0.
When _open_osfhandle is used on a socket descriptor, both _close() andclosesocket() should be called before exiting. _close() only closes thefile handle. closesocket() has to be called as well to close the socketdescriptor and clean up the underlying socket object.