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From: Al Viro <viro@ZenIV.linux.org.uk>
To: George Spelvin <linux@horizon.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Is there a reason hard links from /proc/$PID/fd/$NUM are disallowed?
Date: Sun, 4 Dec 2011 21:00:27 +0000	[thread overview]
Message-ID: <20111204210027.GA2203@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20111204204044.10290.qmail@science.horizon.com>

On Sun, Dec 04, 2011 at 03:40:44PM -0500, George Spelvin wrote:
> I was trying to save a large file that was in mid-download that I had
> accidentally deleted (as part of making space in /tmp to hold the file!).
> 
> Since it was being held open by the download process, I tried
> 
> ln /proc/$PID/fd/$FD /tmp/bigfile.mp4

You do realize that link(2) does *NOT* follow links, do you?  linkat(2)
does, if you explicitly ask for that:

linkat(AT_FDCWD, "/proc/42/fd/1", AT_FDCWD, "/tmp/foo", AT_SYMLINK_FOLLOW)

will do it just fine.

  reply	other threads:[~2011-12-04 21:00 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-04 20:40 Is there a reason hard links from /proc/$PID/fd/$NUM are disallowed? George Spelvin
2011-12-04 21:00 ` Al Viro [this message]
2011-12-04 21:38   ` George Spelvin

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