It expects the callers to include this, so make sure we're consistently
providing one.

We no longer support such old X servers so start using the current
functions.

We now require at least 1.16, so remove all code that handled older
versions than that.

We removed support in the code ages ago, but overlooked this part of the
documentation. Also remove some dead code in Xvnc on the same theme.

Our main web site now supports https, so update all references.

Function xorgGlxCreateVendor() is defined in glx_extinit.h, if this header is
not included, we might get either error or warning. This header also need to
be included after scrninststr.h header as it defines some structures used
in glx_extinit.h

In-server GLVND requires xorgGlxCreateVendor call from InitOutput.
DPMS functions were moved to another location and no longer need to be faked.
xserver120.patch is a copy of xserver119.patch with refreshed contexts.

This can be used to test if a layout if possible.

Screen is a Xvnc thing and not relevant for x0vncserver etc.

RANDR is mandatory since Xorg 1.7, which is the oldest version we
support.

In RandR land, there's a lot of return code confusion. Our wrappers
are using the same return codes as RRCrtcSet, RRScreenSizeSet: 1/TRUE
for success. Fixes:

* vncRandRCreateOutputs did not follow this convention

* A lot of code returned -1 upon failure

* vncRandRDisableOutput returned 0 for already disabled outputs

These two code blocks are not specific to Xvnc/vnc.so, but useful for
x0vncserver as well. RandrGlue.h defines the interface on which
unixcommon depends on.

No longer tolerate loading the VNC extension but not being able to
initialize it. This avoids a lot of error prone checking to see
if the extension has started fully or not.

xserver 1.19's OsInit will create a pollfd, followed by checking if fd 2 /
stderr is writable and if it is not, replacing fd 2 with /dev/null.

Since we close stderr in inetd mode to avoid xserver messages being send
to the client as vnc data, the pollfd becomes fd 2, only to be replaced
by /dev/null since a pollfd is not writable.

This commit fixes this by opening /dev/null directly after the close(2),
avoiding that the pollfd becomes fd 2.

Alan Coopersmith: Change to use dup2() for atomic switch of fd

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Xvnc didn't handle multiple screens properly as it forgot to place
them without overlap and didn't handle cursor movement between them.

Starting Xvnc without having any VNC functionality is pretty much
pointless. So terminate when that happens, making the situation easier
to detect for startup scripts.

Desktop environments like to change to the monitor's preferred
mode, especially at login. Lacking one, they pick the highest
resolution they can find. This tends to override what the user
has picked, so try to work around the desktop environments by
setting the preferred mode to what the user has chosen.

Credit goes to Michal Srb who figured out the problem.

We cannot handle a reset properly right now and are forced to terminate
instead. Avoid surprising people with a dying Xvnc by changing the default
to -noreset.

VNC prevents X server restarting even when -reset is explicitly given. Print
out message with explanation and terminate instead.

Also remove Xalloc/Xfree definitions, using malloc/free directly
instead. Note that vfbAllocateFramebufferMemory() does not need to
check for failed allocations as it is the caller's responsibility to
do so (and they do).

In particular, return 0 as this is a failure.

This prevents e.g. 'Xvnc -screen x' crashing.

The internal Xorg headers are very incompatible with C++ and we've had
to resort to all kinds of hacks in order to include them in our C++
code. This approach isn't really viable long term so restructure things
so that we have a glue layer written in C that bridges the Xorg core
with the RFB classes.

The 1.4 branch is now live, so change the version number of the
development builds.