PostgreSQL in Windows console and Ctrl-C

Hello all,

when pg_ctl start is used to run PostgreSQL in a console window on
Windows, it runs in the background (it is terminated by closing the
window, but that is probably inevitable). There is one problem, however:
The first Ctrl-C in that window, no matter in which situation, will
cause the background postmaster to exit. If you, say, ping something,
and press Ctrl-C to stop ping, you probably don't want the database to
go away, too.

The reason is that Windows delivers the Ctrl-C event to all processes
using that console, not just to the foreground one.

Here's a patch to fix that. "pg_ctl stop" still works, and it has no
effect when running as a service, so it should be safe. It starts the
postmaster in a new process group (similar to calling setpgrp() after
fork()) that does not receive Ctrl-C events from the console window.

--
Christian