[Interest] proper (silent) exit in response to SIGHUP?

[René J. V. Bertin]

And a complementary question: why does  QXcbConnection::processXcbEvents() call 
exit() when the X server (probably) died, if that's not supposed to work?

I wonder if that explains why I sometimes see evidence of Qt applications that 
crashed after an X server went down.

R.