From 666d07f241970482f17dc4bf7a5dff737d9b8357 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 23 Jan 2024 22:53:13 +0100
Subject: [PATCH] [3.11] gh-114492: Initialize struct termios before calling
 tcgetattr() (GH-114495) (GH-114503)

On Alpine Linux it could leave some field non-initialized.
(cherry picked from commit d22c066b802592932f9eb18434782299e80ca42e)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
---
 .../next/Library/2024-01-23-21-20-40.gh-issue-114492.vKxl5o.rst | 2 ++
 Modules/termios.c                                               | 2 ++
 2 files changed, 4 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2024-01-23-21-20-40.gh-issue-114492.vKxl5o.rst

diff --git a/Misc/NEWS.d/next/Library/2024-01-23-21-20-40.gh-issue-114492.vKxl5o.rst b/Misc/NEWS.d/next/Library/2024-01-23-21-20-40.gh-issue-114492.vKxl5o.rst
new file mode 100644
index 00000000000..8df8299d0df
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-01-23-21-20-40.gh-issue-114492.vKxl5o.rst
@@ -0,0 +1,2 @@
+Make the result of :func:`termios.tcgetattr` reproducible on Alpine Linux.
+Previously it could leave a random garbage in some fields.
diff --git a/Modules/termios.c b/Modules/termios.c
index be5d099072c..23771b2ce99 100644
--- a/Modules/termios.c
+++ b/Modules/termios.c
@@ -84,6 +84,8 @@ termios_tcgetattr_impl(PyObject *module, int fd)
     struct termios mode;
     int r;
 
+    /* Alpine Linux can leave some fields uninitialized. */
+    memset(&mode, 0, sizeof(mode));
     Py_BEGIN_ALLOW_THREADS
     r = tcgetattr(fd, &mode);
     Py_END_ALLOW_THREADS