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