bug#1058: 23.0.60; emacs --daemon should not return until socket is ready

[Romain Francoise]

Andreas Schwab <schwab@suse.de> writes:

> sleep takes an integer, not a float.

Hrm, yeah.  And the detach function should be guarded otherwise it
would close random fds on each call, which is probably not what we
want.  And the while-sleep loop should be done differently.

But anyway, this was just a quick proof of concept, it happened to
compile and work on the first try, so...