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wmsetbg: free the previous root pixmap via the ESETROOT pairing

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Commit 6c107e0c switched duplicatePixmap() to RetainTemporary and
removed XKillClient() from setPixmapProperty(). RetainTemporary
resources are released only on server reset, so each background change
now leaves a full-screen pixmap retained in the X server until logout.
In helper mode that is one leak per workspace switch.
This commit is contained in:
David Maciejak
2026-06-15 21:40:03 -04:00
committed by Carlos R. Mafra
parent 6c107e0ce5
commit 774e696270
1 changed files with 58 additions and 24 deletions
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util/wmsetbg.c
+58 -24
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@@ -781,12 +781,8 @@ static Pixmap duplicatePixmap(Pixmap pixmap, int width, int height)
Display *tmpDpy;
Pixmap copyP;
/* Open a separate connection so the pixmap survives our exit.
* RetainTemporary (not RetainPermanent) is used intentionally:
* the pixmap lives until the X session ends, avoiding the need
* for XKillClient() on old pixmaps (which can crash when the
* X server reuses a client ID that now belongs to our own
* connection, causing "X connection broken"). */
/* must open a new display or the RetainPermanent will
* leave stuff allocated in RContext unallocated after exit */
tmpDpy = XOpenDisplay(display);
if (!tmpDpy) {
wwarning("could not open display to update background image information");
@@ -799,45 +795,83 @@ static Pixmap duplicatePixmap(Pixmap pixmap, int width, int height)
XCopyArea(tmpDpy, pixmap, copyP, DefaultGC(tmpDpy, scr), 0, 0, width, height, 0, 0);
XSync(tmpDpy, False);
XSetCloseDownMode(tmpDpy, RetainTemporary);
XSetCloseDownMode(tmpDpy, RetainPermanent);
XCloseDisplay(tmpDpy);
}
return copyP;
}
static int dummyErrorHandler(Display * dpy, XErrorEvent * err)
{
/* Parameter not used, but tell the compiler that it is ok */
(void) dpy;
(void) err;
return 0;
}
static Bool getRootPixmapAtom(Atom prop, Pixmap *ret)
{
Atom type;
int format;
unsigned long length, after;
unsigned char *data = NULL;
*ret = None;
if (XGetWindowProperty(dpy, root, prop, 0L, 1L, False, AnyPropertyType,
&type, &format, &length, &after, &data) != Success)
return False;
if (type == XA_PIXMAP && format == 32 && length == 1 && data) {
*ret = *(Pixmap *)data;
XFree(data);
return True;
}
if (data)
XFree(data);
return False;
}
static void setPixmapProperty(Pixmap pixmap)
{
static Atom prop = 0;
Atom type;
int format;
unsigned long length, after;
unsigned char *data;
static Atom eprop = 0;
Pixmap old_root, old_eset;
Bool have_root, have_eset;
if (!prop) {
prop = XInternAtom(dpy, "_XROOTPMAP_ID", False);
eprop = XInternAtom(dpy, "ESETROOT_PMAP_ID", False);
}
XGrabServer(dpy);
/* Read and discard the old property data. We no longer call
* XKillClient() on the old pixmap: since duplicatePixmap() uses
* RetainTemporary, old pixmaps are freed automatically when the
* X session ends. Calling XKillClient() here was unsafe because
* the X server reuses client IDs; if the stored resource ID was
* reassigned to our own connection the server would kill us,
* producing "X connection to :0 broken". */
XGetWindowProperty(dpy, root, prop, 0L, 1L, False, AnyPropertyType,
&type, &format, &length, &after, &data);
if (data)
XFree(data);
/* Free the previous background pixmap only when both _XROOTPMAP_ID
* and ESETROOT_PMAP_ID hold the same XID, that pairing marks a
* RetainPermanent zombie left by a compliant root setter so
* XKillClient on it cannot hit a live connection. A bare
* _XROOTPMAP_ID may come from a tool that closed in Destroy mode,
* in which case the client bits of the stored XID can already be
* recycled to a live client, including our own dpy, and killing
* it produces "X connection broken". */
have_root = getRootPixmapAtom(prop, &old_root);
have_eset = getRootPixmapAtom(eprop, &old_eset);
if (have_root && have_eset && old_root == old_eset && old_eset != None) {
XSetErrorHandler(dummyErrorHandler);
XKillClient(dpy, old_eset);
XSync(dpy, False);
XSetErrorHandler(NULL);
}
if (pixmap)
if (pixmap) {
XChangeProperty(dpy, root, prop, XA_PIXMAP, 32, PropModeReplace,
(unsigned char *)&pixmap, 1);
else
XChangeProperty(dpy, root, eprop, XA_PIXMAP, 32, PropModeReplace,
(unsigned char *)&pixmap, 1);
} else {
XDeleteProperty(dpy, root, prop);
XDeleteProperty(dpy, root, eprop);
}
XUngrabServer(dpy);
XFlush(dpy);