sa := syscall.RawSockaddrUnix{Family: syscall.AF_UNIX}

name := addr.Name

n := len(name)

for i := 0; i < n; i++ {

sa.Path[i] = int8(name[i])

}

return unsafe.Pointer(&sa), byte(2 + n + 1) // length is family (uint16), name, NUL.