Microsoft KB Archive/177653

= CRT Conflict with Getservbyname =

Article ID: 177653

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q177653



SYMPTOMS
When you use the getservbyname function, an error is returned and the Services file located in %SystemRoot\System32\Drivers\Etc cannot be processed.



CAUSE
When C runtimes (CRTs) are linked dynamically (/MD - use Msvcrt.dll), the modules share one copy of the _fmode global variable. A change from its default _O_TEXT to _O_BINARY affects all modules, causing getservbyname to fail because it expects _O_TEXT.

When the CRT is linked statically, there are multiple copies of the CRT (and, therefore, multiple copies of _fmode) involved, meaning that changing the value of _fmode in the program changes the default mode for fopen throughout the .exe, but the default mode for any calls to fopen from the sockets DLL accesses the _fmode variable in CRT DLL whose value is _O_TEXT; therefore, no failure.



RESOLUTION
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 the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack

Note that a specific version of this hotfix is now available for customers seeing this issue on Windows NT Terminal Server. Please contact Microsoft Customer support to obtain this fix.



STATUS
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.

Keywords: kbbug kbfix KB177653

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