Part 2 of prior commit

1 files changed, 111 insertions, 0 deletions

diff --git a/tdm/backend/reset.c b/tdm/backend/reset.c
new file mode 100644
index 000000000..2c2100870
--- /dev/null
+++ b/tdm/backend/reset.c
@@ -0,0 +1,111 @@
+/*
+
+Copyright 1988, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+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 COPYRIGHT HOLDERS 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 a copyright holder 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 copyright holder.
+
+*/
+
+/*
+ * 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 *dspl ATTR_UNUSED, XErrorEvent *event ATTR_UNUSED )
+{
+		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( Window window )
+{
+		Window root, parent, *children;
+		unsigned int child, nchildren = 0;
+
+		while (XQueryTree( dpy, window, &root, &parent, &children, &nchildren )
+		       && nchildren > 0)
+		{
+				for (child = 0; child < nchildren; child++) {
+						Debug( "XKillClient %p\n", children[child] );
+						XKillClient( dpy, children[child] );
+				}
+				XFree( (char *)children );
+		}
+}
+
+static Jmp_buf resetJmp;
+
+/* ARGSUSED */
+static void
+abortReset( int n ATTR_UNUSED )
+{
+		Longjmp( resetJmp, 1 );
+}
+
+/*
+ * this display connection better not have any windows...
+ */
+
+void
+pseudoReset()
+{
+		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 );
+						killWindows( RootWindow( dpy, screen ) );
+				}
+				Debug( "before XSync\n" );
+				XSync( dpy, False );
+				(void)alarm( 0 );
+		}
+		Signal( SIGALRM, SIG_DFL );
+		XSetErrorHandler( (XErrorHandler)0 );
+		Debug( "pseudoReset done\n" );
+}