--- ray/src/rt/devmain.c	1990/01/30 11:37:52	1.7
+++ ray/src/rt/devmain.c	1990/02/22 12:45:25	1.9
@@ -14,29 +14,24 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include <stdio.h>
 
-#include <signal.h>
-
 #include "color.h"
 
 #include "driver.h"
 
 int	(*wrnvec)(), (*errvec)(), (*cmdvec)();	/* error vectors, unused */
 
-long	nrays = 0;				/* fake it */
-
 struct driver	*dev = NULL;			/* output device */
 
 FILE	*devin, *devout;			/* communications channels */
 
-int	notified = 0;				/* notified parent of input? */
-
 char	*progname;				/* driver name */
 
-int	r_clear(), r_paintr(), r_getcur(), r_comout(), r_comin();
+int	r_clear(), r_paintr(), r_getcur(), r_comout(), r_comin(), r_flush();
 
 int	(*dev_func[NREQUESTS])() = {		/* request handlers */
 		r_clear, r_paintr,
-		r_getcur, r_comout, r_comin
+		r_getcur, r_comout,
+		r_comin, r_flush
 	};
 
 
@@ -102,19 +97,23 @@ r_paintr()				/* paint a rectangle */
 	COLOR	col;
 	int	xmin, ymin, xmax, ymax;
 
-	nrays += 5;			/* pretend */
 	fread((char *)col, sizeof(COLOR), 1, devin);
 	xmin = getw(devin); ymin = getw(devin);
 	xmax = getw(devin); ymax = getw(devin);
 	(*dev->paintr)(col, xmin, ymin, xmax, ymax);
-					/* check for input */
-	if (!notified && dev->inpready > 0) {
-		notified = 1;
-		kill(getppid(), SIGIO);
-	}
 }
 
 
+r_flush()				/* flush output */
+{
+	if (dev->flush != NULL)
+		(*dev->flush)();
+	putc(COM_FLUSH, devout);
+	putw(dev->inpready, devout);
+	fflush(devout);
+}
+
+
 r_getcur()				/* get and return cursor position */
 {
 	int	c;
@@ -157,9 +156,8 @@ r_comin()				/* read string from command line */
 					/* reply */
 	putc(COM_COMIN, devout);
 	myputs(buf, devout);
+	putw(dev->inpready, devout);
 	fflush(devout);
-					/* reset notify */
-	notified = 0;
 }