Knowledge Base

FIX: Timing Crack Between FD_CONNECT and Call to Shut Down API

Article ID: 186244

Article Last Modified on 10/29/2003

Microsoft Windows NT Server 4.0 Standard Edition
Microsoft Windows NT Workstation 4.0 Developer Edition

This article was previously published under Q186244

SYMPTOMS

When using WSAEventSelect, a call to the shutdown API shortly after receiving a FD_CONNECT notification might fail with WSAENOTCONN.

CAUSE

There is a timing crack between receipt of a FD_CONNECT notification and a subsequent call to the shutdown API where the system reports that the socket is not connected.

RESOLUTION

Use one of the following to work around this problem:

Use a blocking call to the connect or WSAConnect API.
If you receive WSAENOTCONN when calling the shutdown API, place the call to the shutdown API in a loop with a small delay (few milliseconds).

STATUS

This problem was corrected in Windows 2000.

Keywords: kbbug kbfix kbwinsock kbapi kbnetwork kboswin2000fix KB186244