Before there was no way of getting a white background despite having
the approriate code.

Backport of this commit:

  commit cb0a565d2b2cf8823abbd77b4426cc2237731dc1
  Author: Daniel Stone <daniel@fooishbar.org>
  Date:   Fri Aug 18 17:04:48 2006 +0300

    dix: add whiteroot flag
    Add a -wr option to use a white root window, and use a BackPixel rather
    than BackPixmap for both white and black root windows.

Fixes ArcticaProject/nx-libs#832

Before there was no way of getting a white background despite having
the approriate code.

Backport of this commit:

  commit cb0a565d2b2cf8823abbd77b4426cc2237731dc1
  Author: Daniel Stone <daniel@fooishbar.org>
  Date:   Fri Aug 18 17:04:48 2006 +0300

    dix: add whiteroot flag
    Add a -wr option to use a white root window, and use a BackPixel rather
    than BackPixmap for both white and black root windows.

Fixes ArcticaProject/nx-libs#832

We are not using any alloc function that respects that variable, so
lets drop it. Backport of this commit:

  commit 0ce61e21d6d7dcca0090e319bbcdb678570f2c3f
  Author: Adam Jackson <ajax@redhat.com>
  Date:   Fri Oct 3 16:05:19 2008 -0400

    Remove the Must_have_memory hack.

    Also remove an astonishing amount of misunderstanding of how casts work.

is used nowhere anyway

hw/nxagent/: Stop using non-portable '__progname', set up our own 'nxagentProgName' instead and pass it around where needed.

Fixes ArcticaProject/nx-libs#639.

nxagent will abort if it encounters an unknown command line option. As
we want 3.6 to be a drop-in replacement for 3.5 we cannot simply drop old
options but must accept them as no-op.

 Fixes ArcticaProject/nx-libs#296.

 Inspired by the following X.org commit. Other than X.org, we will continue
 support for building nx-libs against libXfont1 for a while.

 commit 05a793f5b3c40747d5a92a076def7f4fb673c7e7
 Author: Keith Packard <keithp@keithp.com>
 Date:   Tue Sep 1 18:50:55 2015 -0700

    dix: Switch to the libXfont2 API (v2)

    This new libXfont API eliminates exposing internal X server symbols to
    the font library, replacing those with a struct full of the entire API
    needed to use that library.

    v2: Use libXfont2 instead of libXfont_2
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>

 commit cbb165ab88cb0810268001e84d87671440baf837
 Author: Adam Jackson <ajax@redhat.com>
 Date:   Fri Apr 3 18:34:45 2009 -0400

    os: Remove the useless -x option
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 commit bc348bd2c42f3f18786085ccef2f010eff5bf3d2
 Author: Jon TURNEY <jon.turney@dronecode.org.uk>
 Date:   Mon Mar 11 14:34:32 2013 +0000

    Handle -displayfd and an explicit display number sensibly

    Handle -displayfd and an explicit display number sensibly, e.g. use the
    explicitly specified display number, and write it to the displayfd

    v2: displayfd might be 0, so use -1 as invalid value
    v3: Rebase for addition of NoListenAll flag
Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 This allows us to trigger the NoListenAll := TRUE code path in nxagent.

 commit 44fe1b8ea284df6bbaef67e246016d104665b2fe
 Author: Kristian Høgsberg <krh@bitplanet.net>
 Date:   Wed Mar 19 14:03:13 2014 -0700

    os: Add a mechanism to prevent creating any listen sockets

    A socket-activated server will receive its listening sockets from the
    parent process and should not create its own sockets.  This patch
    introduces a NoListen flag that can be set by a DDX to prevent
    the server from creating the sockets.  When NoListen is enabled, we
    also disable the server lock checking, since the parent process is
    responsible for checking the lock before picking the display name and
    creating the sockets.
Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 commit 88bacc49f06da5927f716869f5a32672a8297ed0
 Author: Chase Douglas <chase.douglas@canonical.com>
 Date:   Wed Apr 4 15:29:42 2012 -0700

    os: Add -displayfd option

    This option specifies a file descriptor in the launching process.  X
    will scan for an available display number and write that number back to
    the launching process, at the same time as SIGUSR1 generation.  This
    means display managers don't need to guess at available display numbers.
    As a consequence, if X fails to start when using -displayfd, it's not
    because the display was in use, so there's no point in retrying the X
    launch on a higher display number.
Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Tested-by: Julien Cristau <jcristau@debian.org>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 Backported from X.org:

 commit 6178b1c91cfc9e860914acc6f0be2f2d2e07a124
 Author: Adam Jackson <ajax@redhat.com>
 Date:   Tue Jun 7 15:52:11 2016 -0400

    dix: Use OsSignal() not signal()

    As the man page for the latter states:

        The effects of signal() in a multithreaded process are unspecified.

    We already have an interface to call sigaction() instead, use it.
Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>

 commit e10ba9e4b52269b2ac75c4802dce4ca47d169657
 Author: Keith Packard <keithp@keithp.com>
 Date:   Wed Nov 11 22:02:01 2015 -0800

    Remove non-smart scheduler. Don't require setitimer.

    This allows the server to call GetTimeInMillis() after each request is
    processed to avoid needing setitimer. -dumbSched now turns off the
    setitimer.
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

 commit 1f915e8b524dd02011158aa038935970684c7630
 Author: Daniel Drake <drake@endlessm.com>
 Date:   Wed May 20 13:16:12 2015 -0600

    Keep SIGALRM restart flag after Popen

    Commit 94ab7455 added SA_RESTART to the SIGALRM handler.  However, the
    Popen code tears down and recreates the SIGALRM handler via OsSignal(),
    and this flag is dropped at this time.

    Clean the code to use just a single codepath for creating this signal
    handler, always applying SA_RESTART.

    [ajax: Fixed commit id]
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Daniel Drake <drake@endlessm.com>

 commit 94ab7455abc213fc96760e29ab2e943ec682fb22
 Author: Daniel Drake <drake@endlessm.com>
 Date:   Tue May 12 16:39:22 2015 -0600

    Allow system call restarts upon signal interruption

    The X server frequently deals with SIGIO and SIGALRM interruptions.
    If process execution is inside certain blocking system calls
    when these signals arrive, e.g. with the kernel blocked on
    a contended semaphore, the system calls will be interrupted.

    Some system calls are automatically restartable (the kernel re-executes
    them with the same parameters once the signal handler returns) but
    only if the signal handler allows it.

    Set SA_RESTART on the signal handlers to enable this convenient
    behaviour.
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Daniel Drake <drake@endlessm.com>

 commit a6c71ce5d2d2fe89e07a2ef5041c915acc3dc686
 Author: Tiago Vignatti <tiago.vignatti@nokia.com>
 Date:   Mon Mar 28 19:21:28 2011 +0300

    os: fix memory and fd leaks in Popen
Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Nicolas Peninguy <nico@lostgeeks.org>

 commit c9051b684b524549eab6d5b88ee3e195a6f6fbe8
 Author: Alan Coopersmith <alan.coopersmith@sun.com>
 Date:   Wed Nov 5 18:25:57 2008 -0800

    Use OsSignal in Popen/Pclose to avoid SysV signal() stupidity

 commit 0e9ef65fa583bf2393dd0fda82df6f092387b425
 Author: Keith Packard <keithp@koto.keithp.com>
 Date:   Wed Nov 7 16:33:10 2007 -0800

    Don't frob timers unless SmartSchedule is running

 commit 2338d5c9914e2a43c3a4f7ee0f4355ad0a1ad9e7
 Author: Arjan van de Ven <arjan@linux.intel.com>
 Date:   Sun Oct 28 09:37:52 2007 +0100

    reduce wakeups from smart scheduler

    The smart scheduler itimer currently always fires after each request
    (which in turn causes the CPU to wake out of idle, burning precious
    power). Rather than doing this, just stop the timer before going into
    the select() portion of the WaitFor loop. It's a cheap system call, and
    it will only get called if there's no more commands batched up from the
    active fd.

    This change also allows some of the functions to be simplified;
    setitimer() will only fail if it's passed invalid data, and we don't do
    that... so make it void and remove all the conditional code that deals
    with failure.

    The change also allows us to remove a few variables that were used for
    housekeeping between the signal handler and the main loop.
Signed-off-by: Keith Packard <keithp@koto.keithp.com>

 **Note**: The above change also required ABI changes in hw/nxagent/.

 commit abe0a51f3f790f8c055289465e130177c4b647cc
 Author: Ben Byer <bbyer@bbyer.apple.com>
 Date:   Fri Sep 21 17:07:36 2007 -0700

    So, like, checking return codes of system calls (signal, etc) is good.
    Also, only restore an old signal handler if one was actually set
    (prevents the server from dying on OS X).

 commit 6da39c67905500ab2db00a45cda4a9f756cdde96
 Author: Eric Anholt <eric@anholt.net>
 Date:   Wed Sep 12 13:23:13 2007 +0000

    Fix build on FreeBSD after Popen changes.

 commit a5b8053606d6e786cdcf6734f271acc05f9cc588
 Author: Adam Jackson <ajax@benzedrine.nwnk.net>
 Date:   Tue Sep 11 11:37:06 2007 -0400

    Ignore - not just block - SIGALRM around Popen()/Pclose().

    Because our "popen" implementation uses stdio, and because nobody's stdio
    library is capable of surviving signals, we need to make absolutely sure
    that we hide the SIGALRM from the smart scheduler.  Otherwise, when you
    open a menu in openoffice, and it recompiles XKB to deal with the
    accelerators, and you popen xkbcomp because we suck, then the scheduler
    will tell you you're taking forever doing something stupid, and the
    wait() code will get confused, and input will hang and your CPU usage
    slams to 100%.  Down, not across.
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Xserver/os/oscolor.c: Follow X.org in dropping the rgb.txt file entirely. Content of that file is now hard-coded.

 Adopting an exact copy of os/oscolor.c from X.org leads to this compiler warning:

 ```
 oscolor.c:844:1: warning: string length ‘7614’ is greater than the length ‘4095’ ISO C99 compilers are required to support [-Woverlength-strings]
 };
 ^
 ```

 This will be address later in coordination with X.org.

 Note: there is a tiny change in oscolor.c as we ship it. The original X.org file includes <X11/keysym.h> which seems
 unneeded. We drop that one line from oscolor.c.

 Fixes ArcticaProject/nx-libs#259.

 Backported from X.org:

 commit 9f9268821b13038556fbc029df54ab0e9b2aa77f
 Author: Mathieu Bérard <mathieu.berard@crans.org>
 Date:   Mon Aug 11 13:52:38 2008 -0400

    The smart scheduler is not optional.
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 Relates to ArcticaProject/nx-libs#275.

 Relates to ArcticaProject/nx-libs#275.

 Relates to ArcticaProject/nx-libs#275.

 Fixes ArcticaProject/nx-libs#274.

 Fixes ArcticaProject/nx-libs#272.

 Fixes ArcticaProject/nx-libs#271.

Xserver/os/oscolor.c: Follow X.org in dropping the rgb.txt file entirely. Content of that file is now hard-coded.

 Adopting an exact copy of os/oscolor.c from X.org leads to this compiler warning:

 ```
 oscolor.c:844:1: warning: string length ‘7614’ is greater than the length ‘4095’ ISO C99 compilers are required to support [-Woverlength-strings]
 };
 ^
 ```

 This will be address later in coordination with X.org.

 Note: there is a tiny change in oscolor.c as we ship it. The original X.org file includes <X11/keysym.h> which seems
 unneeded. We drop that one line from oscolor.c.

 Fixes ArcticaProject/nx-libs#259.

 Backported from X.org:

 commit 9f9268821b13038556fbc029df54ab0e9b2aa77f
 Author: Mathieu Bérard <mathieu.berard@crans.org>
 Date:   Mon Aug 11 13:52:38 2008 -0400

    The smart scheduler is not optional.
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

 Relates to ArcticaProject/nx-libs#275.

 Relates to ArcticaProject/nx-libs#275.

 Relates to ArcticaProject/nx-libs#275.

 Fixes ArcticaProject/nx-libs#274.

 Fixes ArcticaProject/nx-libs#272.

 Fixes ArcticaProject/nx-libs#271.

Just like upstream does

just like upstream does

Per-file copyright notices: Update copyright information in file headers that NoMachine placed there own copyright statement in.

 There's no sense verifying that we can create the lock file and then
 ignoring the return value from write.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Jamey Sharp <jamey@minilop.net>
 Backport to nx-libs: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

os: Remove deprecated malloc/free wrappers, clean {X,XNF}{alloc,calloc,realloc,free,strdup} from pre-C89 baggage

 Backported from X.org:

 commit cad9b053d52f62432dfd70e42e0240de77027cae
 Author: Adam Jackson <ajax@redhat.com>
 Date:   Tue Jul 8 13:24:25 2014 -0400

    os: Remove deprecated malloc/free wrappers
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>

 commit e983848ab44b0769f97f6207f1aa8b4f127be6a9
 Author: Mikhail Gusarov <dottedmag@dottedmag.net>
 Date:   Thu May 6 00:16:24 2010 +0700

    Clean {X,XNF}{alloc,calloc,realloc,free,strdup} from pre-C89 baggage

    C89 guarantees alignment of pointers returned from malloc/calloc/realloc, so
    stop fiddling with alignment manually and just pass the arguments to library
    functions.

    Also convert silent error when negative size is passed into function into
    warning in log file.
Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

 Backport to nx-libs: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>