INFO: WSA_FLAG_OVERLAPPED Needed for Timeout on WSASocket

• Microsoft Win32 Software Development Kit (SDK), used with:
  • Windows NT
  • Windows 95
  • Microsoft Windows 98
  • 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 kbNTOS400 kbWinOS2000 kbSDKPlatform kbWinOS95 kbWinOS98 kbWinsock kbGrpNet
Version : WINDOWS:
Platform : WINDOWS
Issue type : kbinfo