SetBlocking
virtual void SetBlocking(Boolean) { } // No-op for files
virtual void SetBlocking(Boolean b); // Set block/non-block
SetBlocking(TRUE);
SetBlocking(saveblock); // Restore the saved blocking i/o state
SetBlocking(TRUE);
SetBlocking(saveblock); // Restore the saved blocking i/o state
SetBlocking(TRUE);
SetBlocking(saveblock); // Restore the saved blocking i/o state
SetBlocking(TRUE);
SetBlocking(saveblock); // Restore the saved blocking i/o state