I thought this was interesting ... so I expanded it just a wee bit: 

$ (cd /tmp; perl -e 'symlink("foo","bar") or die $!; open F, ">bar" or
+ die $!; rename "foo", "blah" or die $!; print readlink("/proc/$$/fd/
+".fileno(F)),$/'; rm blah bar)
/tmp/blah

[download]
As should be expected(?), it follows renames. And, quite interestingly ... 
$ (cd /tmp; perl -e 'symlink("foo","bar") or die $!; open F, ">bar" or
+ die $!; unlink "foo" or die $!; print readlink("/proc/$$/fd/".fileno
+(F)),$/'; rm bar)
/tmp/foo (deleted)

[download]
Wow. That's cool. Imagine the abuse one could wreak on a poor programmer by creating a file "/tmp/foo \(deleted\)" :-) I suppose that testing for the file being deleted means actually testing the symlink via stat (e.g., -e).

In reply to Re^7: How to detect if file is in use? by Tanktalus
in thread How to detect if file is in use? by blazar

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