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unbufcall cancels a pending bufcall() or esbbcall() request. The argument id is a non-zero identifier for the request to
be cancelled. id is returned from the bufcall() or esbbcall() function used to issue the request. unbufcall() will not return
until the pending callback is cancelled or has run. Because of this, locks acquired by the callback routine should not be held across the call to unbufcall() or deadlock may result.
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