Function glib::source::unix_fd_add

pub fn unix_fd_add<F>(fd: RawFd, condition: IOCondition, func: F) -> SourceId where
    F: FnMut(RawFd, IOCondition) -> Continue + Send + 'static, 

Adds a closure to be called by the main loop the returned Source is attached to whenever a UNIX file descriptor reaches the given IO condition.

func will be called repeatedly while the file descriptor matches the given IO condition until it returns Continue(false).

The default main loop almost always is the main loop of the main thread. Thus the closure is called on the main thread.