You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: socket_hurd.go
    path of file: ./repos/gccrs/libgo/go/syscall
    
    the code of the file until where you have to start completion: // socket_hurd.go -- Socket handling specific to GNU/Hurd based systems.
// This file is derived fr
    
func (sa *RawSockaddrUnix) getLen() (int, error) {
	if sa.Len < 2 || sa.Len > SizeofSockaddrUnix {
		return 0, EINVAL
	}

	// Some BSDs include the trailing NUL in the length, whereas
	// others do not. Work around this by subtracting the leading
	// family and len. The path is then scanned to see if a NUL
	// terminator still exists within the length.
	n := int(sa.Len) - 2 // subtract leading Family, Len
	for i := 0; i < n; i++ {
		if sa.Path[i] == 0 {
			// found early NUL; assume Len included the NUL
			// or was overestimating.
			n = i
			break
		}
	}
	return n, nil
}