Commit 80fab03198 introduced a way to
prevent waitforx going to the network when trying to open a display,
and hence potentially blocking.
This method turned out to be invalidated by libxcb version 1.16 and
1.17
This change adds an explicit check that the Unix socket for the display
in /tmp/.X11-unix/Xn is open before trying to connect to display ':n'.
This has the same effect.
Without this, the compilation of waitforx can fail on FreeBSD
with this error:-
waitforx.c:1:10: fatal error: 'X11/extensions/Xrandr.h' file not found
This PR makes the use of AM_CPPFLAGS and AM_CFLAGS the same as
that for (e.g.) chansrv which also depends on X includes
For some window managers (fvwm2 and fvwm3) if the X server isn't
running and has output it's possible for the window manager to fail or
reconfigure randr incorrectly.
With xrdp-waitfox:
- Install xrdp-waitfox to the BIN dir.
- sesman will run xrdp-waitfox as the logged in user.
- Set an alarm to exit after 30 seconds.
- Try to open env DISPLAY value's display (10 seconds).
- Test for RandR extension.
- Wait for outputs to appear (10 seconds).
matt335672