Cygwin/X: Handle failure during winScreenInit()

Handle failure during winScreenInit() a bit more cleanly, rather than crashing

This avoids a crash with 'XWin -fullscreen -screen 0 @2 -screen 1 @1'

Also document that fullscreen may only be applied to one screen.

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>
Tested-by: Colin Harrison <colin.harrison@virgin.net>

hw/xwin/man/XWin.man

@@ -67,7 +67,7 @@ The default behaviour is to create a single screen 0 that is roughly the
 size of useful area of the primary monitor (allowing for any window
 decorations and the task-bar).
 
-Screen specific parameters, such as \fB\-fullscreen\fP, can be applied as a
+Screen specific parameters can be applied as a
 default to all screens by placing those screen specific parameters
 before any \fB\-screen\fP parameter.  Screen specific parameters placed after
 the first \fB\-screen\fP parameter will apply only to the immediately
@@ -108,6 +108,7 @@ in \fB-multiwindow\fP or \fB-rootless\fP mode.
 .B "\-fullscreen"
 The X server window takes the full screen, covering completely the
 \fIWindows\fP desktop.
+Currently \fB\-fullscreen\fP may only be applied to one X screen.
 .TP 8
 .B \-nodecoration
 Do not give the Cygwin/X window a \fIWindows\fP window border, title bar,

hw/xwin/winpfbdd.c

@@ -294,6 +294,7 @@ winCloseScreenPrimaryDD (int nIndex, ScreenPtr pScreen)
 
   /* Call the wrapped CloseScreen procedure */
   WIN_UNWRAP(CloseScreen);
+  if (pScreen->CloseScreen)
     fReturn = (*pScreen->CloseScreen) (nIndex, pScreen);
 
   /* Delete the window property */

hw/xwin/winscrinit.c

@@ -220,6 +220,10 @@ winScreenInit (int index,
   if (!((*pScreenPriv->pwinFinishScreenInit) (index, pScreen, argc, argv)))
     {
       ErrorF ("winScreenInit - winFinishScreenInit () failed\n");
+
+      /* call the engine dependent screen close procedure to clean up from a failure */
+      pScreenPriv->pwinCloseScreen(index, pScreen);
+
       return FALSE;
     }
 

hw/xwin/winshaddd.c

@@ -728,6 +728,7 @@ winCloseScreenShadowDD (int nIndex, ScreenPtr pScreen)
 
   /* Call the wrapped CloseScreen procedure */
   WIN_UNWRAP(CloseScreen);
+  if (pScreen->CloseScreen)
     fReturn = (*pScreen->CloseScreen) (nIndex, pScreen);
 
   winFreeFBShadowDD(pScreen);

hw/xwin/winshadddnl.c

@@ -802,6 +802,7 @@ winCloseScreenShadowDDNL (int nIndex, ScreenPtr pScreen)
 
   /* Call the wrapped CloseScreen procedure */
   WIN_UNWRAP(CloseScreen);
+  if (pScreen->CloseScreen)
     fReturn = (*pScreen->CloseScreen) (nIndex, pScreen);
 
   winFreeFBShadowDDNL(pScreen);

hw/xwin/winshadgdi.c

@@ -636,6 +636,7 @@ winCloseScreenShadowGDI (int nIndex, ScreenPtr pScreen)
 
   /* Call the wrapped CloseScreen procedure */
   WIN_UNWRAP(CloseScreen);
+  if (pScreen->CloseScreen)
     fReturn = (*pScreen->CloseScreen) (nIndex, pScreen);
 
   /* Delete the window property */