From ac686a47c13e4ca892f43b4216154c2c140a2787 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 2 Sep 2018 14:29:10 +0530
Subject: [PATCH] Fail early when opening tty fails

---
 kitty/data-types.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kitty/data-types.c b/kitty/data-types.c
index 92bad6761..eca5a315b 100644
--- a/kitty/data-types.c
+++ b/kitty/data-types.c
@@ -126,6 +126,7 @@ open_tty(PyObject *self UNUSED, PyObject *args) {
     if (!read_with_timeout) flags |= O_NONBLOCK;
     static char ctty[L_ctermid+1];
     int fd = open(ctermid(ctty), flags);
+    if (fd == -1) { PyErr_SetFromErrno(PyExc_OSError); return NULL; }
     struct termios *termios_p = calloc(1, sizeof(struct termios));
     if (!termios_p) return PyErr_NoMemory();
     if (tcgetattr(fd, termios_p) != 0) { free(termios_p); PyErr_SetFromErrno(PyExc_OSError); return NULL; }