Philipp Stephani wrote:

> +  if (!file_name_absolute_p (dir))

That doesn't look right here, since leading '~' counts as absolute to 
file_name_absolute_p, which is not what is wanted here.

> +      errno = ENOTCONN;

Why ENOTCONN? Shouldn't it be ENOENT? The failure has nothing to do with socket 
connections.

Also, I'd feel a bit better if we apply the workaround only to the function that 
has the problem.

How about the attached patch instead?