Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtlogin/reset.c

@@ -0,0 +1,127 @@
+/*                                                                      *
+ * (c) Copyright 1993, 1994 Hewlett-Packard Company                     *
+ * (c) Copyright 1993, 1994 International Business Machines Corp.       *
+ * (c) Copyright 1993, 1994 Sun Microsystems, Inc.                      *
+ * (c) Copyright 1993, 1994 Novell, Inc.                                *
+ */
+/*
+ * xdm - display manager daemon
+ *
+ * $XConsortium: reset.c /main/4 1995/10/27 16:14:40 rswiston $
+ *
+ * Copyright 1988 Massachusetts Institute of Technology
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose and without fee is hereby granted, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  M.I.T. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as is"
+ * without express or implied warranty.
+ *
+ * Author:  Keith Packard, MIT X Consortium
+ */
+
+/*
+ * pseudoReset -- pretend to reset the server by killing all clients
+ * with windows.  It will reset the server most of the time, unless
+ * a client remains connected with no windows.
+ */
+
+# include	<setjmp.h>
+# include	<sys/signal.h>
+# include	"dm.h"
+# include	"vgmsg.h"
+
+
+/***************************************************************************
+ *
+ *  Local procedure declarations
+ *
+ ***************************************************************************/
+
+static SIGVAL abortReset( int arg ) ;
+static int ignoreErrors( Display *dpy, XErrorEvent *event) ;
+static void killWindows( Display *dpy, Window window) ;
+
+
+
+/***************************************************************************
+ *
+ *  
+ *
+ ***************************************************************************/
+
+/*ARGSUSED*/
+static int 
+ignoreErrors( Display *dpy, XErrorEvent *event )
+{
+	Debug ("Ignoring error...\n");
+	return 1;
+}
+
+/*
+ * this is mostly bogus -- but quite useful.  I wish the protocol
+ * had some way of enumerating and identifying clients, that way
+ * this code wouldn't have to be this kludgy.
+ */
+
+static void 
+killWindows( Display *dpy, Window window )
+{
+	Window	root, parent, *children;
+	int	child;
+	unsigned int nchildren = 0;
+	
+	while (XQueryTree (dpy, window, &root, &parent, &children, &nchildren)
+	       && nchildren > 0)
+	{
+		for (child = 0; child < nchildren; child++) {
+			Debug ("Calling XKillClient() for window 0x%x\n",
+				children[child]);
+			XKillClient (dpy, children[child]);
+		}
+		XFree ((char *)children);
+	}
+}
+
+static jmp_buf	resetJmp;
+
+static SIGVAL
+abortReset( int arg )
+{
+	longjmp (resetJmp, 1);
+}
+
+/*
+ * this display connection better not have any windows...
+ */
+ 
+void 
+pseudoReset( Display *dpy )
+{
+	Window	root;
+	int	screen;
+
+	if (setjmp (resetJmp)) {
+		LogError(
+		  ReadCatalog(MC_LOG_SET,MC_LOG_PSEUDO,MC_DEF_LOG_PSEUDO));
+	} else {
+		signal (SIGALRM, abortReset);
+		alarm (30);
+		XSetErrorHandler (ignoreErrors);
+		for (screen = 0; screen < ScreenCount (dpy); screen++) {
+			Debug ("Pseudo reset screen %d\n", screen);
+			root = RootWindow (dpy, screen);
+			killWindows (dpy, root);
+		}
+		Debug ("Before XSync\n");
+		XSync (dpy, False);
+		(void) alarm (0);
+	}
+	signal (SIGALRM, SIG_DFL);
+	XSetErrorHandler ((int (*)()) 0);
+	Debug ("pseudoReset() done\n");
+}