kubernetes/vendor/go.etcd.io/bbolt/bolt_unix.go

// flock acquires an advisory lock on a file descriptor.
func flock(db *DB, exclusive bool, timeout time.Duration) error { … }

// funlock releases an advisory lock on a file descriptor.
func funlock(db *DB) error { … }

// mmap memory maps a DB's data file.
func mmap(db *DB, sz int) error { … }

// munmap unmaps a DB's data file from memory.
func munmap(db *DB) error { … }