--- ray/src/common/unix_process.c	2016/03/04 02:48:14	3.11
+++ ray/src/common/unix_process.c	2019/05/14 18:37:36	3.14
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: unix_process.c,v 3.11 2016/03/04 02:48:14 greg Exp $";
+static const char	RCSid[] = "$Id: unix_process.c,v 3.14 2019/05/14 18:37:36 greg Exp $";
 #endif
 /*
  * Routines to communicate with separate process via dual pipes
@@ -28,7 +28,7 @@ char	*av[]
 	char	*compath;
 	int	p0[2], p1[2];
 
-	pd->pid = 0;
+	pd->pid = -1;
 	pd->running = 0;		/* not going yet */
 	
 	if (av == NULL)			/* cloning operation? */
@@ -37,7 +37,13 @@ char	*av[]
 		return(0);
 	if (pipe(p0) < 0 || pipe(p1) < 0)
 		return(-1);
-	if ((pd->pid = fork()) == 0) {	/* if child... */
+#ifdef BSD
+	if (compath != NULL)
+		pd->pid = vfork();	/* more efficient with exec() */
+	else
+#endif
+	pd->pid = fork();
+	if (pd->pid == 0) {		/* if child... */
 		close(p0[1]);
 		close(p1[0]);
 		if (p0[0] != 0) {	/* connect p0 to stdin */
@@ -88,18 +94,19 @@ int nproc
 			close(pd[i].w);
 			close(pd[i].r);
 			pd[i].running = 0;
-		}
+		} else 
+			togo -= (pd[i].pid < 0);
 	if (nproc == 1) {			/* await specific process? */
 		if (waitpid(pd->pid, &status, 0) != pd->pid)
 			return(-1);
-		pd->pid = 0;
+		pd->pid = -1;
 		return(status>>8 & 0xff);
 	}
 						/* else unordered wait */
 	while (togo > 0 && (pid = wait(&status)) >= 0) {
 		for (i = nproc; i-- > 0; )
 			if (pd[i].pid == pid) {
-				pd[i].pid = 0;
+				pd[i].pid = -1;
 				--togo;
 				break;
 			}