Type Alias IOServiceInterestCallback 

pub type IOServiceInterestCallback = Option<unsafe extern "C-unwind" fn(*mut c_void, io_service_t, u32, *mut c_void)>;

Available on crate feature libc only.

Callback function to be notified of changes in state of an IOService.

Parameter refcon: The refcon passed when the notification was installed.

Parameter service: The IOService whose state has changed.

Parameter messageType: A messageType enum, defined by IOKit/IOMessage.h or by the IOService’s family.

Parameter messageArgument: An argument for the message, dependent on the messageType. If the message data is larger than sizeof(void*), then messageArgument contains a pointer to the message data; otherwise, messageArgument contains the message data.

See also Apple’s documentation

Aliased Type

pub enum IOServiceInterestCallback {
    None,
    Some(unsafe extern "C-unwind" fn(*mut c_void, u32, u32, *mut c_void)),
}

Variants

None

No value.

Some(unsafe extern "C-unwind" fn(*mut c_void, u32, u32, *mut c_void))

Some value of type T.