At Tue, 28 Aug 2018 18:50:31 +0300, Alexander Korotkov <a.korotkov@postgrespro.ru> wrote in
<CAPpHfduqEyyjLXCNx_t7K2ugCDGVW7WLKL+zrfDEd5wzkvmg-w@mail.gmail.com>
> On Tue, Aug 21, 2018 at 4:48 AM Kyotaro HORIGUCHI
> <horiguchi.kyotaro@lab.ntt.co.jp> wrote:
> >
> > At Fri, 10 Aug 2018 15:33:26 +0300, Alexander Kuzmenkov <a.kuzmenkov@postgrespro.ru> wrote in
<5142559a-82e6-b3e4-d6ed-8fd2d240c77e@postgrespro.ru>
> > > On 08/09/2018 10:33 AM, Kyotaro HORIGUCHI wrote:
> > > >
> > > > - Since I'm not sure unlink is signal-handler safe on all
> > > > supported platforms, I moved unlink() call out of
> > > > checkLogrotateSignal() to SysLoggerMain, just before rotating
> > > > log file.
> > >
> > > Which platforms specifically do you have in mind? unlink() is required
> > > to be async-signal-safe by POSIX.1-2001, which is required by UNIX 03,
> > > and these are rather old.
> >
> > I suspect that something bad can happen on Windows. Another
> > reason for the movement I didn't mention was it is not necesarry
> > to be there. So I applied the principle that a signal handler
> > should be as small and simple as possible. As the result the
> > flow of logrotate signal handling becomes similar to that for
> > promote signal.
>
> I went through this thread. It started from discussion about changing
> signal handling in syslogger, which has spotted set of problems.
> However, now there is a patch which add new pg_ctl command, which
> issues SIGUSR1 to syslogger. It seems that nobody in the thread
> object against this feature.
Agreed.
> I've revised this patch a bit. It appears to me that only postmaster
> cares about logrotate file, while syslogger just handles SIGUSR1 as it
> did before. So, I've moved code that deletes logrotate file into
> postmaster.c.
As replied to Michael's commnet, I agree to the change.
> Also I found that this new pg_ctl isn't covered with tests at all. So
> I've added very simple tap tests, which ensures that when log file was
> renamed, it reappeared again after pg_ctl logrotate. I wonder how
> that would work on Windows. Thankfully commitfest.cputube.org have
> Windows checking facility now.
Thanks for the test. Documentaion and help message looks fine
including the changed ordering. (180 seconds retry may be a bit
too long but I'm fine with it.)
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center