Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 348 insertions, 0 deletions

diff --git a/nx-X11/programs/Xserver/hw/dmx/dmxprop.c b/nx-X11/programs/Xserver/hw/dmx/dmxprop.c
new file mode 100644
index 000000000..8d9e22a27
--- /dev/null
+++ b/nx-X11/programs/Xserver/hw/dmx/dmxprop.c
@@ -0,0 +1,348 @@
+/* $XFree86$ */
+/*
+ * Copyright 2002-2003 Red Hat Inc., Durham, North Carolina.
+ *
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation on the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) 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
+ * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
+ * 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.
+ */
+
+/*
+ * Authors:
+ *   Rickard E. (Rik) Faith <faith@redhat.com>
+ *
+ */
+
+/** \file
+ *
+ * It is possible for one of the DMX "backend displays" to actually be
+ * smaller than the dimensions of the backend X server.  Therefore, it
+ * is possible for more than one of the DMX "backend displays" to be
+ * physically located on the same backend X server.  This situation must
+ * be detected so that cursor motion can be handled in an expected
+ * fashion.
+ *
+ * We could analyze the names used for the DMX "backend displays" (e.g.,
+ * the names passed to the -display command-line parameter), but there
+ * are many possible names for a single X display, and failing to detect
+ * sameness leads to very unexpected results.  Therefore, whenever the
+ * DMX server opens a window on a backend X server, a property value is
+ * queried and set on that backend to detect when another window is
+ * already open on that server.
+ *
+ * Further, it is possible that two different DMX server instantiations
+ * both have windows on the same physical backend X server.  This case
+ * is also detected so that pointer input is not taken from that
+ * particular backend X server.
+ *
+ * The routines in this file handle the property management. */
+
+#ifdef HAVE_DMX_CONFIG_H
+#include <dmx-config.h>
+#endif
+
+#include "dmx.h"
+#include "dmxprop.h"
+#include "dmxlog.h"
+
+/** Holds the window id of all DMX windows on the backend X server. */
+#define DMX_ATOMNAME "DMX_NAME"
+
+/** The identification string of this DMX server */
+#define DMX_IDENT    "Xdmx"
+
+extern char *display;
+
+static int dmxPropertyErrorHandler(Display *dpy, XErrorEvent *ev)
+{
+    return 0;
+}
+
+static const unsigned char *dmxPropertyIdentifier(void)
+{
+                                /* RATS: These buffers are only used in
+                                 * length-limited calls. */
+    char          hostname[256];
+    static char   buf[128];
+    static int    initialized = 0;
+
+    if (initialized++) return (unsigned char *)buf;
+    
+    XmuGetHostname(hostname, sizeof(hostname));
+    XmuSnprintf(buf, sizeof(buf), "%s:%s:%s", DMX_IDENT, hostname, display);
+    return (unsigned char *)buf;
+}
+
+/** Starting with the \a start screen, iterate over all of the screens
+ * on the same physical X server as \a start, calling \a f with the
+ * screen and the \a closure.  (The common case is that \a start is the
+ * only DMX window on the backend X server.) */
+void *dmxPropertyIterate(DMXScreenInfo *start,
+                         void *(*f)(DMXScreenInfo *dmxScreen, void *),
+                         void *closure)
+{
+    DMXScreenInfo *pt;
+
+    if (!start->next) {
+        if (!start->beDisplay) return NULL;
+        return f(start, closure);
+    }
+
+    for (pt = start->next; /* condition at end of loop */; pt = pt->next) {
+        void *retval;
+        /* beDisplay ban be NULL if a screen was detached */
+        dmxLog(dmxDebug, "pt = %p\n", pt);
+        dmxLog(dmxDebug, "pt->beDisplay = %p\n", pt->beDisplay);
+        if (pt->beDisplay && (retval = f(pt, closure))) return retval;
+        if (pt == start) break;
+    }
+    return NULL;
+}
+
+/** Returns 0 if this is the only Xdmx session on the display; 1
+ * otherwise. */
+static int dmxPropertyCheckOtherServers(DMXScreenInfo *dmxScreen, Atom atom)
+{
+    Display       *dpy    = dmxScreen->beDisplay;
+    XTextProperty tp;
+    XTextProperty tproot;
+    const char    *pt;
+    int           retcode = 0;
+    char          **list  = NULL;
+    int           count   = 0;
+    int           i;
+    int           (*dmxOldHandler)(Display *, XErrorEvent *);
+
+    if (!dpy)
+	return 0;
+
+    if (!XGetTextProperty(dpy, RootWindow(dpy,0), &tproot, atom)
+        || !tproot.nitems) return 0;
+    
+                                /* Ignore BadWindow errors for this
+                                 * routine because the window id stored
+                                 * in the property might be old */
+    dmxOldHandler = XSetErrorHandler(dmxPropertyErrorHandler);
+    for (pt = (const char *)tproot.value; pt && *pt; pt = pt ? pt + 1 : NULL) {
+        if ((pt = strchr(pt, ','))) {
+            Window win = strtol(pt+1, NULL, 10);
+            if (XGetTextProperty(dpy, win, &tp, atom) && tp.nitems) {
+                if (!strncmp((char *)tp.value, DMX_IDENT, strlen(DMX_IDENT))) {
+                    int flag = 0;
+                    for (i = 0; i < count; i++)
+                        if (!strcmp(list[i], (char *)tp.value)) {
+                            ++flag;
+                            break;
+                        }
+                    if (flag) continue;
+                    ++retcode;
+                    dmxLogOutputWarning(dmxScreen,
+                                        "%s also running on %s\n",
+                                        tp.value, dmxScreen->name);
+                    list = xrealloc(list, ++count * sizeof(*list));
+                    list[count-1] = xalloc(tp.nitems + 2);
+                    strncpy(list[count-1], (char *)tp.value, tp.nitems + 1);
+                }
+                XFree(tp.value);
+            }
+        }
+    }
+    XSetErrorHandler(dmxOldHandler);
+
+    for (i = 0; i < count; i++) xfree(list[i]);
+    xfree(list);
+    XFree(tproot.value);
+    if (!retcode)
+        dmxLogOutput(dmxScreen, "No Xdmx server running on backend\n");
+    return retcode;
+}
+
+/** Returns NULL if this is the only Xdmx window on the display.
+ * Otherwise, returns a pointer to the dmxScreen of the other windows on
+ * the display. */
+static DMXScreenInfo *dmxPropertyCheckOtherWindows(DMXScreenInfo *dmxScreen,
+                                                   Atom atom)
+{
+    Display             *dpy = dmxScreen->beDisplay;
+    const unsigned char *id  = dmxPropertyIdentifier();
+    XTextProperty       tproot;
+    XTextProperty       tp;
+    const char          *pt;
+    int                 (*dmxOldHandler)(Display *, XErrorEvent *);
+
+    if (!dpy)
+	return NULL;
+
+    if (!XGetTextProperty(dpy, RootWindow(dpy,0), &tproot, atom)
+        || !tproot.nitems) return 0;
+
+                                /* Ignore BadWindow errors for this
+                                 * routine because the window id stored
+                                 * in the property might be old */
+    dmxOldHandler = XSetErrorHandler(dmxPropertyErrorHandler);
+    for (pt = (const char *)tproot.value; pt && *pt; pt = pt ? pt + 1 : NULL) {
+        if ((pt = strchr(pt, ','))) {
+            Window win = strtol(pt+1, NULL, 10);
+            if (XGetTextProperty(dpy, win, &tp, atom) && tp.nitems) {
+                dmxLog(dmxDebug,"On %s/%lu: %s\n",
+                       dmxScreen->name, win, tp.value);
+                if (!strncmp((char *)tp.value, (char *)id,
+                             strlen((char *)id))) {
+                    int idx;
+                    
+                    if (!(pt = strchr((char *)tp.value, ','))) continue;
+                    idx = strtol(pt+1, NULL, 10);
+                    if (idx < 0 || idx >= dmxNumScreens) continue;
+                    if (dmxScreens[idx].scrnWin != win) continue;
+                    XSetErrorHandler(dmxOldHandler);
+                    return &dmxScreens[idx];
+                }
+                XFree(tp.value);
+            }
+        }
+    }
+    XSetErrorHandler(dmxOldHandler);
+    XFree(tproot.value);
+    return 0;
+}
+
+/** Returns 0 if this is the only Xdmx session on the display; 1
+ * otherwise. */
+int dmxPropertyDisplay(DMXScreenInfo *dmxScreen)
+{
+    Atom                atom;
+    const unsigned char *id  = dmxPropertyIdentifier();
+    Display             *dpy = dmxScreen->beDisplay;
+
+    if (!dpy)
+	return 0;
+
+    atom = XInternAtom(dpy, DMX_ATOMNAME, False);
+    if (dmxPropertyCheckOtherServers(dmxScreen, atom)) {
+        dmxScreen->shared = 1;
+        return 1;
+    }
+    XChangeProperty(dpy, RootWindow(dpy,0), atom, XA_STRING, 8,
+                    PropModeReplace, id, strlen((char *)id));
+    return 0;
+}
+
+/** Returns 1 if the dmxScreen and the display in \a name are on the
+ * same display, or 0 otherwise.  We can't just compare the display
+ * names because there can be multiple synonyms for the same display,
+ * some of which cannot be determined without accessing the display
+ * itself (e.g., domain aliases or machines with multiple NICs). */
+int dmxPropertySameDisplay(DMXScreenInfo *dmxScreen, const char *name)
+{
+    Display             *dpy0  = dmxScreen->beDisplay;
+    Atom                atom0;
+    XTextProperty       tp0;
+    Display             *dpy1  = NULL;
+    Atom                atom1;
+    XTextProperty       tp1;
+    int                 retval = 0;
+
+    if (!dpy0)
+	return 0;
+
+    tp0.nitems = 0;
+    tp1.nitems = 0;
+
+    if ((atom0 = XInternAtom(dpy0, DMX_ATOMNAME, True)) == None) {
+        dmxLog(dmxWarning, "No atom on %s\n", dmxScreen->name);
+        return 0;
+    }
+    if (!XGetTextProperty(dpy0, RootWindow(dpy0,0), &tp0, atom0)
+        || !tp0.nitems) {
+        dmxLog(dmxWarning, "No text property on %s\n", dmxScreen->name);
+        return 0;
+    }
+
+    if (!(dpy1 = XOpenDisplay(name))) {
+        dmxLog(dmxWarning, "Cannot open %s\n", name);
+        goto cleanup;
+    }
+    atom1 = XInternAtom(dpy1, DMX_ATOMNAME, True);
+    if (atom1 == None) {
+        dmxLog(dmxDebug, "No atom on %s\n", name);
+        goto cleanup;
+    }
+    if (!XGetTextProperty(dpy1, RootWindow(dpy1,0), &tp1, atom1)
+        || !tp1.nitems) {
+        dmxLog(dmxDebug, "No text property on %s\n", name);
+        goto cleanup;
+    }
+    if (!strcmp((char *)tp0.value, (char *)tp1.value)) retval = 1;
+
+  cleanup:
+    if (tp0.nitems) XFree(tp0.value);
+    if (tp1.nitems) XFree(tp1.value);
+    if (dpy1)       XCloseDisplay(dpy1);
+    return retval;
+}
+
+/** Prints a log message if \a dmxScreen is on the same backend X server
+ * as some other DMX backend (output) screen.  Modifies the property
+ * (#DMX_ATOMNAME) on the backend X server to reflect the creation of \a
+ * dmxScreen.
+ *
+ * The root window of the backend X server holds a list of window ids
+ * for all DMX windows (on this DMX server or some other DMX server).
+ *
+ * This list can then be iterated, and the property for each window can
+ * be examined.  This property contains the following tuple (no quotes):
+ *
+ * "#DMX_IDENT:<hostname running DMX>:<display name of DMX>,<screen number>"
+ */
+void dmxPropertyWindow(DMXScreenInfo *dmxScreen)
+{
+    Atom                atom;
+    const unsigned char *id  = dmxPropertyIdentifier();
+    Display             *dpy = dmxScreen->beDisplay;
+    Window              win  = dmxScreen->scrnWin;
+    DMXScreenInfo       *other;
+    char                buf[128]; /* RATS: only used with XmuSnprintf */
+
+    if (!dpy)
+	return; /* FIXME: What should be done here if Xdmx is started
+		 * with this screen initially detached?
+		 */
+
+    atom = XInternAtom(dpy, DMX_ATOMNAME, False);
+    if ((other = dmxPropertyCheckOtherWindows(dmxScreen, atom))) {
+        DMXScreenInfo *tmp = dmxScreen->next;
+        dmxScreen->next    = (other->next ? other->next : other);
+        other->next        = (tmp         ? tmp         : dmxScreen);
+        dmxLog(dmxDebug, "%d/%s/%lu and %d/%s/%lu are on the same backend\n",
+               dmxScreen->index, dmxScreen->name, dmxScreen->scrnWin,
+               other->index, other->name, other->scrnWin);
+    }
+
+    XmuSnprintf(buf, sizeof(buf), ".%d,%lu", dmxScreen->index,
+                (long unsigned)win);
+    XChangeProperty(dpy, RootWindow(dpy,0), atom, XA_STRING, 8,
+                    PropModeAppend, (unsigned char *)buf, strlen(buf));
+
+    XmuSnprintf(buf, sizeof(buf), "%s,%d", id, dmxScreen->index);
+    XChangeProperty(dpy, win, atom, XA_STRING, 8,
+                    PropModeAppend, (unsigned char *)buf, strlen(buf));
+}