[OT] Hardlinks and directories
Suvayu Ali
fatkasuvayu+linux at gmail.com
Sat Feb 13 03:20:14 UTC 2010
On Friday 12 February 2010 05:57 PM, Patrick O'Callaghan wrote:
> On Fri, 2010-02-12 at 16:42 -0800, Suvayu Ali wrote:
>> On Friday 12 February 2010 04:36 PM, Suvayu Ali wrote:
>>> On Friday 12 February 2010 04:07 PM, Patrick O'Callaghan wrote:
>>>> Editors can do funny things with backup files in the interests of
>>>> preserving your work. An easier test would be:
>>>>
>>>> cat> foo&
>>>> rm foo
>>>> lsof +L1 -s
>>>>
>>>> When I do this the "cat" process shows up (and foo is marked as
>>>> deleted). You can then reconnect to "cat" (using fg) and write stuff
>>>> into the "non-existent" file.
>>
>> Another observation I forgot to mention, when I used fg and wrote to the
>> (deleted) file I could also see the size of the file increase. However
>> using `C-z' and fg again gave me back the orginal empty file _without_
>> the edits.
>
> How do you know it doesn't have the edits if you can't open it?
So after I resume the edit with fg %1, I can't see what I had input the
last time. Strangely though I see the size is the same (same as after my
first edit). Here is the transcript from my terminal.
> $ cat > foo &
> [1] 3843
>
> [1]+ Stopped cat > foo
> $ rm foo
> $ lsof +L1 -s
> COMMAND PID USER FD TYPE DEVICE SIZE NLINK NODE NAME
> cat 3843 jallad 1w REG 253,2 0 0 15032 /home/jallad/foo (deleted)
> $ fg %1
> cat > foo
> testing deleted files
> ^Z
> [1]+ Stopped cat > foo
> $ lsof +L1 -s
> COMMAND PID USER FD TYPE DEVICE SIZE NLINK NODE NAME
> cat 3843 jallad 1w REG 253,2 22 0 15032 /home/jallad/foo (deleted)
> $ fg %1
> cat > foo
> ^Z
> [1]+ Stopped cat > foo
> $ lsof +L1 -s
> COMMAND PID USER FD TYPE DEVICE SIZE NLINK NODE NAME
> cat 3843 jallad 1w REG 253,2 22 0 15032 /home/jallad/foo (deleted)
Is this expected?
>
> poc
>
--
Suvayu
Open source is the future. It sets us free.
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