Re: pg_recvlogical, stdout and SIGHUP

From: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>
To: Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: pg_recvlogical, stdout and SIGHUP
Date: 2014-05-13 14:43:47
Message-ID: 53722FA3.9070005@vmware.com
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On 05/13/2014 04:35 PM, Andres Freund wrote:
> On 2014-05-13 16:31:25 +0300, Heikki Linnakangas wrote:
>> Another thing I noticed is that if when the output goes to a file, the file
>> isn't re-opened immediately on SIGHUP. Only after receiving some data from
>> the server. I believe that's also not intentional.
>
> Hm. I can't really get excited about that one. Not doing that seems to
> complicate matters unneccessarily. What's the problem here?

Not sure if it matters in any real-world scenario, but I found it pretty
surprising while playing with it. It should be trivial to fix; ISTM the
problem is that there is a "continue" in the loop when select() is
interrupted by signal, but the re-opening is done after the select() in
the loop. I think all you need to do is move the check for output_reopen
to the beginning of the loop.

- Heikki

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