go/src/os/getwd.go

var getwdCache …

// Getwd returns an absolute path name corresponding to the
// current directory. If the current directory can be
// reached via multiple paths (due to symbolic links),
// Getwd may return any one of them.
//
// On Unix platforms, if the environment variable PWD
// provides an absolute name, and it is a name of the
// current directory, it is returned.
func Getwd() (dir string, err error) { … }