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x11: add _NET_WM_PID property to main window (thanks joe9)

--- a/gui-x11/x11.c

+++ b/gui-x11/x11.c

@@ -115,6 +115,7 @@

 static Atom targets;

 static Atom text;

 static Atom compoundtext;

+static Atom wmpid;

 static	Drawable	xdrawable;

 static	void		xexpose(XEvent*);

@@ -201,6 +202,7 @@

 	XSetWindowAttributes attrs;

 	XPixmapFormatValues *pfmt;

 	Pixmap icon_pixmap;

+	unsigned long pid;

 	memimageinit();

@@ -344,6 +346,16 @@

 		&normalhints,		/* XA_WM_NORMAL_HINTS */

 		&hints,			/* XA_WM_HINTS */

 		&classhints);		/* XA_WM_CLASS */

+	if ((wmpid = XInternAtom(xdisplay, "_NET_WM_PID", False)) != None) {

+		pid = (unsigned long) getpid();

+		XChangeProperty(xdisplay, xdrawable,

+			wmpid, /* Atom property */

+			XA_CARDINAL, /* Atom type */

+			32, /* int format, 32 really is "long" */

+			PropModeReplace, /* int mode */

+			(uchar *)&pid, /* unsigned char * data */

+			1); /* int nelements */

+	}

 	XFlush(xdisplay);

 	/*