macOS privateframework SkyLight.framework private external function test: flash your screen with a visual bell!

SLsymtest.c

//compile with
//cc SLsymtest.c -o SLsymtest -framework Carbon -undefined dynamic_lookup
//  -framework for macho loading commands for SkyLight to be loaded otherwise dyld at runtime will complain and abort
//  -undefined dynamic_lookup to prevent linker from complaining it can't find a definition/implementation for symbol

void SLDisplayDefaultVisualBell();

int main(){
	SLDisplayDefaultVisualBell(); //via default mach port to WindowServer (after SkyLight bootstraps)   
	return 0;
}