Carlos Santos [Thu, 25 Jul 2024 21:39:59 +0000 (18:39 -0300)]
vncsession: use /bin/sh if the user shell is not set
An empty shell field in the password file is valid, although not common.
Use /bin/sh in this case, as documented in the passwd(5) man page, since
the vncserver script requires a non-empty SHELL environment variable.
Fixes issue #1786.
Signed-off-by: Carlos Santos <casantos@redhat.com>
Pierre Ossman [Fri, 5 Jul 2024 12:05:45 +0000 (14:05 +0200)]
Be more careful with ComparingUpdateTracker pointer
As of 28c3f12, we might now be running the frame clock even without a
framebuffer present. This means we need to be more careful accessing the
ComparingUpdateTracker, as it might be NULL.
Pierre Ossman [Fri, 19 Apr 2024 21:48:37 +0000 (23:48 +0200)]
Remove careful client iteratation
Clients cannot remove themselves from the list as we are iterating, so
we don't need this complexity. If a client encounters a problem, it will
only mark it self as closed and will be removed from the list at a later
time.
Pierre Ossman [Wed, 3 Apr 2024 10:38:04 +0000 (12:38 +0200)]
Disable gcc NULL warning for context menu
We use the pointer to just store an identifier for the menu, but this is
enough for gcc to think we are using 0 instead of nullptr and complain.
Even an explicit cast isn't enough to silence it here for some reason.
Pierre Ossman [Tue, 2 Apr 2024 14:06:10 +0000 (16:06 +0200)]
Make sure we use C++ 11
It's rare we use a compiler that has anything older as a default, but it
does happen sometimes. So make sure to guarantee this so we can start
using more modern constructs.
Pierre Ossman [Thu, 6 Jun 2024 12:51:52 +0000 (14:51 +0200)]
Automatically pick a suitable DRI3 render node
Lay the groundwork for a more intelligent selection of GPU in systems
that have multiple cards. This initial implementation simply picks the
first GPU that we have permission to open.
Pierre Ossman [Wed, 21 Feb 2024 16:07:36 +0000 (17:07 +0100)]
Add basic DRI3 support
This provides buffer sync with the primary render node of the system (if
available). By doing so, OpenGL and Vulkan can use the render node for
acceleration.
This first implementation is extremely pessimistic and synchronises
buffers whenever there's even a slight chance they will be used.
Pierre Ossman [Tue, 18 Jun 2024 14:01:55 +0000 (16:01 +0200)]
Avoid VNC updates for offscreen windows
Windows aren't always directly shown, e.g. when the desktop is
composited. We should not be sending screen updates for these as the
framebuffer didn't actually change.
In the case of CopyWindow, we're even sending the wrong screen data,
which is how this bug was discovered.
Pierre Ossman [Mon, 19 Feb 2024 14:28:12 +0000 (15:28 +0100)]
Slow down fake clock when no clients
Run the frame clock at a slow 1 Hz if there are no clients connected.
This is similar to what a normal X server does when the screen is
blanked, and should keep applications waiting for the frame tick happy.
Note that we still only keep the frame clock running if there is any
application that are interested in it. Otherwise we still stop it
completely.
Pierre Ossman [Wed, 28 Feb 2024 13:20:54 +0000 (14:20 +0100)]
Keep frame clock running if waiting for frame tick
If there is something interested in synchronizing to a frame tick, then
keep the frame clock running, even if there are no updates.
This is need mainly when something starts rendering, but also when
something renders much slower than the frame clock (so it is essentially
constantly "starting"). Such an application will not draw anything until
it gets a new frame tick, which it won't get as the frame clock is
waiting for something to start drawing.
Pierre Ossman [Thu, 29 Feb 2024 16:33:43 +0000 (17:33 +0100)]
Restart the frame timer immediately
This marks the timer as started again, before we call out to various
external places that might be confused by the frame timer reporting that
it is stopped.
Pierre Ossman [Fri, 16 Feb 2024 13:31:54 +0000 (14:31 +0100)]
Add support for X Present extension
This makes it possible for applications to synchronize their updates to
the updates sent out to clients. This avoids tearing, and could in the
future also help with rate limiting applications to what the client can
actually show.
Pierre Ossman [Wed, 28 Feb 2024 12:54:23 +0000 (13:54 +0100)]
Maintain a constant VNCServer/SDesktop connection
The desktop isn't completely paused just because there are no clients,
so it might still need some support from the server object.
This is primarily an issue for headless servers, where they need to
continue emulating things even without clients. A scraping server can
generally go completely passive if there are no clients.
Pierre Ossman [Tue, 3 Jan 2023 08:27:46 +0000 (09:27 +0100)]
Add safety check to getNextTimeout()
It currently won't ever be called with an empty list of timers, but it
is a public function so that might happen in the future. Make sure this
case is handled without crashes.
Pierre Ossman [Thu, 29 Feb 2024 08:23:01 +0000 (09:23 +0100)]
Detect conflicting timer rescheduling
Repeating a timer can be done in two ways:
* Returning true from the handler
* Calling start() again in the handler
The latter is useful if you want to change the timer interval.
If both are used, then it becomes ambiguous when the timer should fire
again.
Detect this case and warn about it. Current implementation will respect
the new interval given to start(), rather than the interval set before
running the handler.
Pierre Ossman [Wed, 22 May 2024 09:44:41 +0000 (11:44 +0200)]
Fix late vncsession logging
The syslog file descriptor will be closed when we are cleaning up in
preparation for running the vncserver script, so we need to explicitly
reopen things in case we need to log errors.
At the same time, try to be polite and explicitly close the log when
appropriate.
Pierre Ossman [Mon, 20 May 2024 15:32:57 +0000 (17:32 +0200)]
Add comment that PAM configuration is an example
There is too much variation between distributions for us to have a good
PAM configuration that works everywhere. Try to make this more obvious
by having a comment at the top of the file.
Pierre Ossman [Wed, 10 Apr 2024 10:37:45 +0000 (12:37 +0200)]
Use XQueryPointer() instead to detect zaphod
FLTK can send events with fl_xevent pointing to random memory, which
means that we cannot trust that structure. XQueryPointer() can give us
what we need, at the cost of an extra round trip.