Re: pid file deleted briefly when doing hot restart

["Petteri Räty" <betelgeuse@gentoo.org>]

On 27.11.2012 2.35, Eric Wong wrote:

>>
>> nginx does not explicitly unlink the old pid file before it renames it
>> out of the way so yes matching nginx in that regard changes the behavior
>> exactly how I originally asked but you were against that. Maybe the
>> point is moot though.
> 
> Ah, I thought you wanted the pid file to be replaced without
> a window where the file is non-existent (or empty).
> 

That would be ideal but I meant this thread to be explicitly about the
unlink and resulting couple seconds window. Now that I have spend some
thinking about the issue here's an approach using hard links that can be
used to replace the pid without window of non-existance:

betelgeuse@mac ~/inotify/test_files $ echo "old" > a
betelgeuse@mac ~/inotify/test_files $ ln a a.oldbin
betelgeuse@mac ~/inotify/test_files $ for file in *; do echo $file:
$(stat -f %i $file); done
a: 3730129
a.oldbin: 3730129
betelgeuse@mac ~/inotify/test_files $ echo "new" > b
betelgeuse@mac ~/inotify/test_files $ mv b a
betelgeuse@mac ~/inotify/test_files $ for file in *; do echo $file:
$(stat -f %i $file); done
a: 3730137
a.oldbin: 3730129
betelgeuse@mac ~/inotify/test_files $ cat *
new
old

Regards,
Petteri
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