From a09f62141d43f9f8ac2f0e5e8889fc62629a1d3d Mon Sep 17 00:00:00 2001
From: Justine Tunney <jtunney@gmail.com>
Date: Mon, 16 Oct 2023 00:40:55 -0700
Subject: [PATCH] Fix bug in login_tty()

---
 libc/runtime/login_tty.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libc/runtime/login_tty.c b/libc/runtime/login_tty.c
index 1b49871b3..19ab68f44 100644
--- a/libc/runtime/login_tty.c
+++ b/libc/runtime/login_tty.c
@@ -53,9 +53,9 @@ int login_tty(int fd) {
     errno = e;
     // take control of teletypewriter (requires being leader)
     if ((rc = sys_ioctl(fd, TIOCSCTTY, 0)) != -1) {
-      unassert(!sys_dup2(fd, 0, 0));
-      unassert(!sys_dup2(fd, 1, 0));
-      unassert(!sys_dup2(fd, 2, 0));
+      unassert(sys_dup2(fd, 0, 0) == 0);
+      unassert(sys_dup2(fd, 1, 0) == 1);
+      unassert(sys_dup2(fd, 2, 0) == 2);
       if (fd > 2) {
         unassert(!sys_close(fd));
       }