--- ray/src/rt/devmain.c	1990/02/22 11:46:24	1.8
+++ ray/src/rt/devmain.c	1990/08/02 13:40:23	1.13
@@ -14,8 +14,6 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include <stdio.h>
 
-#include <signal.h>
-
 #include "color.h"
 
 #include "driver.h"
@@ -26,8 +24,6 @@ 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(), r_flush();
@@ -61,9 +57,7 @@ char	*argv[];
 	if ((dev = dinit(argv[0], argv[3])) == NULL)
 		quit(1);
 	putw(COM_RECVM, devout);		/* verify initialization */
-	fwrite((char *)&dev->pixaspect, sizeof(dev->pixaspect), 1, devout);
-	putw(dev->xsiz, devout);
-	putw(dev->ysiz, devout);
+	sendstate();
 	fflush(devout);
 						/* loop on requests */
 	while ((com = getc(devin)) != EOF) {
@@ -105,11 +99,6 @@ r_paintr()				/* paint a rectangle */
 	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);
-	}
 }
 
 
@@ -117,6 +106,9 @@ r_flush()				/* flush output */
 {
 	if (dev->flush != NULL)
 		(*dev->flush)();
+	putc(COM_FLUSH, devout);
+	sendstate();
+	fflush(devout);
 }
 
 
@@ -162,9 +154,8 @@ r_comin()				/* read string from command line */
 					/* reply */
 	putc(COM_COMIN, devout);
 	myputs(buf, devout);
+	sendstate();
 	fflush(devout);
-					/* reset notify */
-	notified = 0;
 }
 
 
@@ -194,15 +185,26 @@ register FILE	*fp;
 stderr_v(s)				/* put string to stderr */
 register char  *s;
 {
-	static int  inline = 0;
+	static int  midline = 0;
 
-	if (!inline++) {
+	if (!*s)
+		return;
+	if (!midline++) {
 		fputs(progname, stderr);
 		fputs(": ", stderr);
 	}
 	fputs(s, stderr);
-	if (*s && s[strlen(s)-1] == '\n') {
+	if (s[strlen(s)-1] == '\n') {
 		fflush(stderr);
-		inline = 0;
+		midline = 0;
 	}
+}
+
+
+sendstate()				/* send driver state variables */
+{
+	fwrite((char *)&dev->pixaspect, sizeof(dev->pixaspect), 1, devout);
+	putw(dev->xsiz, devout);
+	putw(dev->ysiz, devout);
+	putw(dev->inpready, devout);
 }