pub unsafe extern "C" fn CFFileDescriptorCreateRunLoopSource(
allocator: CFAllocatorRef,
f: CFFileDescriptorRef,
order: CFIndex
) -> CFRunLoopSourceRef
pub unsafe extern "C" fn CFFileDescriptorCreateRunLoopSource(
allocator: CFAllocatorRef,
f: CFFileDescriptorRef,
order: CFIndex
) -> CFRunLoopSourceRef