--- ray/src/hd/rholo4.c	1997/11/10 18:07:15	3.5
+++ ray/src/hd/rholo4.c	1998/10/22 08:47:40	3.21
@@ -1,4 +1,4 @@
-/* Copyright (c) 1997 Silicon Graphics, Inc. */
+/* Copyright (c) 1998 Silicon Graphics, Inc. */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ SGI";
@@ -13,33 +13,59 @@ static char SCCSid[] = "$SunId$ SGI";
 #include <sys/uio.h>
 
 #ifndef HDSUF
-#define HDSUF	".hdisp"
+#define HDSUF	".hdi"
 #endif
 
+#ifndef FNONBLK
+#define FNONBLK		O_NONBLOCK
+#endif
+
 static int	inp_flags;
 static int	dpd[3];
-static int	pipesiz;
 static FILE	*dpout;
 
 
 disp_open(dname)		/* open the named display driver */
 char	*dname;
 {
-	char	dpath[128], *com[3];
+	char	dpath[128], fd0[8], fd1[8], *cmd[5];
 	int	i;
-
+				/* get full display program name */
 #ifdef DEVPATH
 	sprintf(dpath, "%s/%s%s", DEVPATH, dname, HDSUF);
 #else
 	sprintf(dpath, "dev/%s%s", dname, HDSUF);
 #endif
-	com[0] = dpath; com[1] = froot; com[2] = NULL;
-	pipesiz = open_process(dpd, com);
-	if (pipesiz <= 0)
+				/* dup stdin and stdout */
+	if (readinp)
+		sprintf(fd0, "%d", dup(0));
+	else
+		strcpy(fd0, "-1");
+	sprintf(fd1, "%d", dup(1));
+				/* start the display process */
+	cmd[0] = dpath;
+	cmd[1] = froot; cmd[2] = fd1; cmd[3] = fd0;
+	cmd[4] = NULL;
+	i = open_process(dpd, cmd);
+	if (i <= 0)
 		error(USER, "cannot start display process");
-	if ((dpout = fdopen(dup(dpd[1]), "w")) == NULL)
+	if ((dpout = fdopen(dpd[1], "w")) == NULL)
 		error(SYSTEM, "cannot associate FILE with display pipe");
+	dpd[1] = -1;		/* causes ignored error in close_process() */
 	inp_flags = 0;
+				/* close dup'ed stdin and stdout */
+	if (readinp)
+		close(atoi(fd0));
+	close(atoi(fd1));
+				/* check if outside */
+	if (vdef(OBSTRUCTIONS) && vbool(OBSTRUCTIONS))
+		disp_result(DS_OUTSECT, 0, NULL);
+				/* send eye separation if specified */
+	if (vdef(EYESEP)) {
+		char	fbuf[32];
+		sprintf(fbuf, "%.9e", vflt(EYESEP));
+		disp_result(DS_EYESEP, strlen(fbuf)+1, fbuf);
+	}
 				/* write out hologram grids */
 	for (i = 0; hdlist[i] != NULL; i++)
 		disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
@@ -61,7 +87,7 @@ int	block;
 	int	n;
 	char	*buf = NULL;
 
-	if (pipesiz <= 0)
+	if (dpout == NULL)
 		return(-1);
 					/* flush display output */
 	disp_flush();
@@ -74,36 +100,45 @@ int	block;
 					/* read message header */
 	n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
 	if (n != sizeof(MSGHEAD)) {
-		if (n >= 0)
+		if (n >= 0) {
+			dpout = NULL;
 			error(USER, "display process died");
+		}
 		if (errno != EAGAIN & errno != EINTR)
 			goto readerr;
 		return(2);		/* acceptable failure */
 	}
 	if (msg.nbytes) {		/* get the message body */
+		if (msg.nbytes < 0)
+			error(INTERNAL, "anti-message from display process");
 		buf = (char *)malloc(msg.nbytes);
 		if (buf == NULL)
 			error(SYSTEM, "out of memory in disp_check");
-		if (fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
+		if (inp_flags != 0 && fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
 			goto fcntlerr;
 		if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
 			goto readerr;
 	}
 	switch (msg.type) {		/* take appropriate action */
-	case DR_BUNDLE:
+	case DR_BUNDLE:		/* new bundle to calculate */
 		if (msg.nbytes != sizeof(PACKHEAD))
 			error(INTERNAL, "bad DR_BUNDLE from display process");
 		bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
 		break;
-	case DR_NEWSET:
+	case DR_NEWSET:		/* new calculation set */
 		if (msg.nbytes % sizeof(PACKHEAD))
 			error(INTERNAL, "bad DR_NEWSET from display process");
-		disp_result(DS_STARTIMM, 0, NULL);
+		if (msg.nbytes)
+			disp_result(DS_STARTIMM, 0, NULL);
 		bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
-		disp_result(DS_ENDIMM, 0, NULL);
-		disp_flush();
+		if (msg.nbytes) {
+			disp_result(DS_ENDIMM, 0, NULL);
+			disp_flush();
+		}
 		break;
-	case DR_ADDSET:
+	case DR_ADDSET:		/* add to calculation set */
+		if (!msg.nbytes)
+			break;
 		if (msg.nbytes % sizeof(PACKHEAD))
 			error(INTERNAL, "bad DR_ADDSET from display process");
 		disp_result(DS_STARTIMM, 0, NULL);
@@ -111,21 +146,63 @@ int	block;
 		disp_result(DS_ENDIMM, 0, NULL);
 		disp_flush();
 		break;
-	case DR_DELSET:
+	case DR_ADJSET:		/* adjust calculation set members */
+		if (!msg.nbytes)
+			break;
 		if (msg.nbytes % sizeof(PACKHEAD))
+			error(INTERNAL, "bad DR_ADJSET from display process");
+		disp_result(DS_STARTIMM, 0, NULL);
+		bundle_set(BS_ADJ, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
+		disp_result(DS_ENDIMM, 0, NULL);
+		disp_flush();
+		break;
+	case DR_DELSET:		/* delete from calculation set */
+		if (!msg.nbytes)
+			break;
+		if (msg.nbytes % sizeof(PACKHEAD))
 			error(INTERNAL, "bad DR_DELSET from display process");
 		bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
 		break;
-	case DR_ATTEN:
+	case DR_ATTEN:		/* block for priority request */
 		if (msg.nbytes)
 			error(INTERNAL, "bad DR_ATTEN from display process");
 					/* send acknowledgement */
 		disp_result(DS_ACKNOW, 0, NULL);
 		return(disp_check(1));	/* block on following request */
-	case DR_SHUTDOWN:
+	case DR_KILL:		/* kill computation process(es) */
 		if (msg.nbytes)
+			error(INTERNAL, "bad DR_KILL from display process");
+		if (nprocs > 0)
+			done_rtrace();
+		else
+			error(WARNING, "no rtrace process to kill");
+		break;
+	case DR_RESTART:	/* restart computation process(es) */
+		if (msg.nbytes)
+			error(INTERNAL, "bad DR_RESTART from display process");
+		if (ncprocs > nprocs)
+			new_rtrace();
+		else if (nprocs > 0)
+			error(WARNING, "rtrace already runnning");
+		else
+			error(WARNING, "holodeck not open for writing");
+		break;
+	case DR_CLOBBER:	/* clobber holodeck */
+		if (msg.nbytes)
+			error(INTERNAL, "bad DR_CLOBBER from display process");
+		if (!force || !ncprocs)
+			error(WARNING, "request to clobber holodeck denied");
+		else {
+			error(WARNING, "clobbering holodeck contents");
+			hdclobber(NULL);
+		}
+		break;
+	case DR_SHUTDOWN:	/* shut down program */
+		if (msg.nbytes)
 			error(INTERNAL, "bad DR_SHUTDOWN from display process");
 		return(0);		/* zero return signals shutdown */
+	case DR_NOOP:		/* do nothing */
+		break;
 	default:
 		error(INTERNAL, "unrecognized request from display process");
 	}
@@ -144,12 +221,11 @@ disp_close()			/* close our display process */
 {
 	int	rval;
 
-	if (pipesiz <= 0)
+	if (dpout == NULL)
 		return(-1);
 	disp_result(DS_SHUTDOWN, 0, NULL);
 	fclose(dpout);
 	dpout = NULL;
-	pipesiz = 0;
 	return(close_process(dpd));
 }
 
@@ -159,7 +235,13 @@ int	type, nbytes;
 char	*p;
 {
 	MSGHEAD	msg;
-
+					/* consistency checks */
+#ifdef DEBUG
+	if (nbytes < 0 || nbytes > 0 & p == NULL)
+		error(CONSISTENCY, "bad buffer handed to disp_result");
+#endif
+	if (dpout == NULL)
+		return;
 	msg.type = type;
 	msg.nbytes = nbytes;
 	fwrite((char *)&msg, sizeof(MSGHEAD), 1, dpout);