Import of XFree86 3.9.17

1 files changed, 111 insertions, 0 deletions

diff --git a/xc/programs/xdm/reset.c b/xc/programs/xdm/reset.c
new file mode 100644
index 000000000..1eaba9170
--- /dev/null
+++ b/xc/programs/xdm/reset.c
@@ -0,0 +1,111 @@
+/* $TOG: reset.c /main/12 1998/02/09 13:56:00 kaleb $ */
+/*
+
+Copyright 1988, 1998  The Open Group
+
+All Rights Reserved.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+*/
+/* $XFree86: xc/programs/xdm/reset.c,v 1.2 1998/10/10 15:25:37 dawes Exp $ */
+
+/*
+ * xdm - display manager daemon
+ * 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	"dm.h"
+# include	"dm_error.h"
+
+# include	<X11/Xlib.h>
+# include	<signal.h>
+
+/*ARGSUSED*/
+static int
+ignoreErrors (Display *dpy, XErrorEvent *event)
+{
+	Debug ("ignoring error\n");
+	return 0;
+}
+
+/*
+ * 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 ("XKillClient 0x%lx\n", (unsigned long)children[child]);
+			XKillClient (dpy, children[child]);
+		}
+		XFree ((char *)children);
+	}
+}
+
+static Jmp_buf	resetJmp;
+
+/* ARGSUSED */
+static SIGVAL
+abortReset (int n)
+{
+	Longjmp (resetJmp, 1);
+}
+
+/*
+ * this display connection better not have any windows...
+ */
+ 
+void
+pseudoReset (Display *dpy)
+{
+	Window	root;
+	int	screen;
+
+	if (Setjmp (resetJmp)) {
+		LogError ("pseudoReset timeout\n");
+	} else {
+		(void) Signal (SIGALRM, abortReset);
+		(void) alarm (30);
+		XSetErrorHandler (ignoreErrors);
+		for (screen = 0; screen < ScreenCount (dpy); screen++) {
+			Debug ("pseudoReset 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 ((XErrorHandler)0 );
+	Debug ("pseudoReset done\n");
+}