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Date: Sat, 19 Jan 2002 13:15:11 +0200
From: Ville Herva <vherva@niksula.hut.fi>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: rm-ing files with open file descriptors
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On Fri, Jan 18, 2002 at 06:29:36PM -0800, you [H. Peter Anvin] said:
> 
> This *might* work:
> 
> link("/proc/self/fd/40", newpath);

I don't think so: firstly, it would create a cross device link and secondly,
/proc/<pid>/fd/* are symbolic links. See:

/tmp>while true; do sleep 1; echo kukkanen; done > r &
[1] 19925
/tmp>L /proc/19925/fd 
total 0
lrwx------    1 root     root           64 Jan 19 13:10 0 -> /dev/pts/7
l-wx------    1 root     root           64 Jan 19 13:10 1 -> /tmp/r
lrwx------    1 root     root           64 Jan 19 13:10 2 -> /dev/pts/7
/tmp>rm r               
/tmp>L /proc/19925/fd
total 0
lrwx------    1 root     root           64 Jan 19 13:10 0 -> /dev/pts/7
l-wx------    1 root     root           64 Jan 19 13:10 1 -> /tmp/r (deleted)
lrwx------    1 root     root           64 Jan 19 13:10 2 -> /dev/pts/7
/tmp>ln /proc/19925/fd/1 r2
ln: /proc/19925/fd/1: warning: making a hard link to a symbolic link is not portable
ln: create hard link `r2' to `/proc/19925/fd/1': Invalid cross-device link

I think one has to use lsof, ps and/or fuser and then kill.


-- v --

v@iki.fi
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