WSAUnhookBlockingHook()

Description

Restore the default blocking hook function. 

#include <winsock.h>

int PASCAL FAR WSAUnhookBlockingHook ( void );

Remarks

This function removes any previous blocking hook that has been installed and reinstalls the default blocking mechanism.

WSAUnhookBlockingHook() will always install the default mechanism, not the previous mechanism. If an application wish to nest blocking hooks -- i.e. to establish a temporary blocking hook function and then revert to the previous mechanism (whether the default or one established by an earlier WSASetBlockingHook()) - it must save and restore the value returned by WSASetBlockingHook(); it cannot use WSAUnhookBlockingHook().

In multithreaded versions of Windows such as Windows NT, there is no default blocking hook. Calling WSAUnhookBlockingHook() disables any blocking hook installed by the application and any blocking calls made block the thread which made the call.

Return Value

The return value is 0 if the operation was successful. Otherwise the value SOCKET_ERROR is returned, and a specific error number may be retrieved by calling WSAGetLastError().

Error Codes