INFO: WSA_FLAG_OVERLAPPED Needed for Timeout on WSASocket |
Q181610
The information in this article applies to:
- Microsoft Win32 Software Development Kit (SDK), used with:
- the operating system: Microsoft Windows NT
- Microsoft Windows 95
- Microsoft Windows 98
- the operating system: Microsoft Windows 2000
SUMMARY
If you create a socket using the Winsock 2 WSASocket API and you need to apply a timeout in receive or send operations on the socket, you must specify the WSA_FLAG_OVERLAPPED flag in the WSASocket call.
MORE INFORMATION
If a socket is created without the overlapped I/O attribute, all I/O operations on the socket are synchronous. So if your program has set socket options SO_SNDTIMEO and SO_RCVTIMEO, you need to make sure your socket is created with the overlapped I/O attribute to timeout your blocking send or receive operations.
The overlapped I/O attribute of a socket created via the socket API is set internally. If you use WSASocket API, you need to set the WSA_FLAG_OVERLAPPED flag yourself in the last parameter of this API call.
Additional query words:
Keywords : kbnetwork kbAPI kbOSWinNT400 kbOSWin2000 kbSDKPlatform kbOSWin95 kbOSWin98 kbWinsock kbGrpDSNet
Issue type : kbinfo
Technology : kbWin32SDKSearch kbAudDeveloper kbSDKSearch kbWin32sSearch
Last Reviewed: December 17, 2000 |
