Re: [Patch] Create a new session in postmaster by calling setsid()

Michael Paquier <michael(at)paquier(dot)xyz> writes:
> On Mon, Aug 06, 2018 at 12:11:26PM +0800, Paul Guo wrote:
>> Yes, if considering the case of starting postmaster manually, we can not
>> create
>> a new session in postmaster, so pg_ctl seems to be a good place for setsid()
>> call. Attached a newer patch. Thanks.

> Hmm. This patch breaks a feature of pg_ctl that I am really fond of for
> development. When starting a node which enters in recovery, I sometimes
> use Ctrl-C to stop pg_ctl, which automatically makes the started
> Postgres instance to stop, and this saves more strokes. With your
> patch, you don't get that anymore: when issuing Ctrl-C on pg_ctl then
> the started instance still runs in the background. I would be ready to
> accept a patch which does not change the default behavior, and makes the
> deamonization behavior activated only if an option switch is given by
> the user, like -d/--daemon. So I am -1 for what is proposed in its
> current shape.

Hmm, that seems like a pretty niche usage. I don't object to having
a switch to control this, but it seems to me that dissociating from
the terminal is by far the more commonly wanted behavior and so
ought to be the default.

regards, tom lane