
  -type posix() ::
            eacces | eagain | ebadf | ebadmsg | ebusy | edeadlk |
            edeadlock | edquot | eexist | efault | efbig | eftype |
            eintr | einval | eio | eisdir | eloop | emfile | emlink |
            emultihop | enametoolong | enfile | enobufs | enodev |
            enolck | enolink | enoent | enomem | enospc | enosr | enostr |
            enosys | enotblk | enotdir | enotsup | enxio | eopnotsupp |
            eoverflow | eperm | epipe | erange | erofs | espipe | esrch |
            estale | etxtbsy | exdev.

  An atom that is named from the POSIX error codes used in Unix, and
  in the runtime libraries of most C compilers.
