bug#34069: dired-do-rename on fifos hangs if cross device

[Stefan Kangas]

tags 34069 + confirmed
retitle 34069 rename-file on fifos hangs if cross device
thanks

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> $ mkfifo x
> then do dired-do-rename x /tmp #not on the same filesystem
> This just hangs forever.
> (Don't ask me why I am doing this.)
> emacs-version "26.1"
> $ mv x /tmp #works just fine though.

It actually hangs on the rename-file call in copy-file.

Here is a minimal reproducer:

(progn (shell-command "mkfifo foo")
       (rename-file "foo" "/tmp"))