Microsoft KB Archive/134254

= WINSOCK.DLL Asynch. Send Doesn't Signal WSAEWOULDBLOCK =

Article ID: 134254

Article Last Modified on 10/23/2003

-

APPLIES TO


 * Microsoft LAN Manager 2.2 Standard Edition
 * Microsoft Windows for Workgroups 3.11

-



This article was previously published under Q134254



SYMPTOMS
Applications issuing asynchronous send calls to LAN Manager's real mode TCP/IP WINSOCK.DLL fail.



CAUSE
The WINSOCK.DLL file included in the real mode TCP/IP protocol from LAN Manager and Windows for Workgroups 3.11 does not "set errno = WSAEWOULDBLOCK" and "SOCKET_ERROR = -1" when the out buffer is full on send calls to an asynchronous socket.



RESOLUTION
Use Microsoft TCP/IP-32 for Windows for Workgroups, a protected mode VxD TCP/IP and its accompanying WINSOCK.DLL or test for the condition where send on an asynchronous socket returns 0 bytes written and periodically issue select on the socket until your application is able to send again.



STATUS
Microsoft has confirmed this to be a problem in LAN Manager 2.2b and Windows for Workgroups 3.11. A fix to this problem is in development, but has not been regression-tested and may be destabilizing in production environments. Microsoft does not recommend implementing this fix at this time. Contact Microsoft Product Support Services for more information on the availability of this fix.

Additional query words: 2.2c, 2.2b, 2.20

Keywords: KB134254

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.