When you try to build a program that uses the fork() function on a Microsoft Windows Services for UNIX 3.5-based computer, you may receive the following error message:

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This problem may occur when the semaphores that are set through a SEM_UNDO flag are not actually deleted. Instead, the semaphores are left in a deleted state.

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A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To install this software update, you must be running Windows Services for UNIX 3.5.

Restart requirement

You must restart the computer after you apply this software update.

Software update replacement information

This software update does not replace any other software updates.

The English version of this software update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

File name	File version	File size	Date	Time	Platform
Posix.exe	8.0.1969.31	130,048	06-May-2005	00:34	x86
Psxrun.exe	8.0.1969.31	104,448	06-May-2005	00:34	x86
Psxss.exe	8.0.1969.31	765,440	06-May-2005	00:34	x86

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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