From: Michael Albinus <michael.albinus@gmx.de>
To: "Drew Adams" <drew.adams@oracle.com>
Cc: 10319@debbugs.gnu.org
Subject: bug#10319: 24.0.92; doc string of `file-remote-p'
Date: Mon, 19 Dec 2011 09:40:19 +0100 [thread overview]
Message-ID: <87bor5eyz0.fsf@gmx.de> (raw)
In-Reply-To: <1C247F238CC24F6F9A0A3D077D3E09FE@us.oracle.com> (Drew Adams's message of "Sun, 18 Dec 2011 07:02:53 -0800")
"Drew Adams" <drew.adams@oracle.com> writes:
> Do you just want to say that `file-remote-p' never opens
> a new connection (i.e., a connection that is not already
> established/open)?
Yes.
> If so, let's just say that: It never opens a new remote
> connection. It can only reuse a connection that is
> already open.
Sounds OK to me.
> I understand, and will try to propose something, once I
> understand what we're really trying to say. Can the handler
> establish a _new_ connection? If so, then `file-remote-p'
> can do so. If not, then can't we just say that
> `file-remote-p' never establishes (opens) a new connection?
It is a promise to libraries using `file-remote-p'. It is guaranteed
that the function call is cheap, and that it could be used here and
there w/o remarkable overhead.
It is also an implementation hint. Any handler that provides an own
implementation of `file-remote-p' shall behave like this.
`tramp-handle-file-remote-p' and `ange-ftp-file-remote-p' do so.
As a consequence, the result might differ whether a connection is
already open, or not. If the connection is not established yet, we get
(file-remote-p "/ssh::" 'localname) => ""
If there is an established connection, we see
(file-remote-p "/ssh::" 'localname) => "/home/albinus"
Best regards, Michael.
next prev parent reply other threads:[~2011-12-19 8:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-18 2:17 bug#10319: 24.0.92; doc string of `file-remote-p' Drew Adams
2011-12-18 8:33 ` Michael Albinus
2011-12-18 15:02 ` Drew Adams
2011-12-19 8:40 ` Michael Albinus [this message]
2011-12-19 16:10 ` Drew Adams
2011-12-19 18:26 ` Michael Albinus
2011-12-19 19:44 ` Drew Adams
2011-12-19 21:18 ` Michael Albinus
2011-12-19 21:29 ` Drew Adams
2011-12-20 9:15 ` Michael Albinus
2011-12-20 15:53 ` Drew Adams
2011-12-20 17:02 ` Michael Albinus
2011-12-20 17:08 ` Drew Adams
2011-12-20 17:14 ` Michael Albinus
2011-12-20 17:33 ` Drew Adams
2011-12-21 18:34 ` Michael Albinus
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