From 15ab430fdd0592d6b2bc1860f3010dc3ad1bda58 Mon Sep 17 00:00:00 2001
From: pancake <pancake@nopcode.org>
Date: Mon, 8 Oct 2018 00:01:29 +0200
Subject: [PATCH] Fix crash in XNU when calling ttyname() on an invalid fd

---
 libr/cons/cons.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libr/cons/cons.c b/libr/cons/cons.c
index 91f9a0b05f..daf2029073 100644
--- a/libr/cons/cons.c
+++ b/libr/cons/cons.c
@@ -1132,7 +1132,7 @@ R_API int r_cons_get_size(int *rows) {
 	struct winsize win = { 0 };
 	if (isatty (0) && !ioctl (0, TIOCGWINSZ, &win)) {
 		if ((!win.ws_col) || (!win.ws_row)) {
-			const char *tty = ttyname (1);
+			const char *tty = isatty (1)? ttyname (1): NULL;
 			int fd = open (tty? tty: "/dev/tty", O_RDONLY);
 			if (fd != -1) {
 				int ret = ioctl (fd, TIOCGWINSZ, &win);