If there is already SIGUSR1 for logfile reopening then shouldn`t
postmaster watch for it? Postmaster PID is easy to obtain.
On 02/28/2018 01:32 AM, Greg Stark wrote:
> On 27 February 2018 at 14:41, Anastasia Lubennikova
> <a.lubennikova@postgrespro.ru> wrote:
>
>> Small patch in the attachment implements logfile reopeninig on SIGHUP.
>> It only affects the file accessed by logging collector, which name you can
>> check with pg_current_logfile().
> HUP will cause Postgres to reload its config files. That seems like a
> fine time to reopen the log files as well but it would be nice if
> there was also some way to get it to *just* do that and not reload the
> config files.
>
> I wonder if it would be easiest to just have the syslogger watch for
> some other signal as well (I'm guessing the the syslogger doesn't use
> relcache invalidations so it could reuse USR1 for example). That would
> be a bit inconvenient as the admins would have to find the syslogger
> and deliver the signal directly, rather than through the postmaster
> but it would be pretty easy for them.
>
--
Grigory Smolkin
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company