1 files changed, 40 insertions, 0 deletions
diff --git a/login/tst-utmp-unsigned.c b/login/tst-utmp-unsigned.c
new file mode 100644
index 0000000..27ad03a
--- /dev/null
+++ b/login/tst-utmp-unsigned.c
@@ -0,0 +1,40 @@
+/* Check that struct utmp, struct utmpx, struct lastlog use unsigned epoch.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <utmp.h>
+#include <utmpx.h>
+#include <utmp-size.h>
+
+/* Undefined.  Used to check that the conditions below are optimized away.  */
+void link_failure_utmp (void);
+void link_failure_utmpx (void);
+void link_failure_lastlog (void);
+
+static int
+do_test (void)
+{
+  if ((struct utmp) { .ut_tv = { 0x80000000U, }, }.ut_tv.tv_sec <= 0)
+    link_failure_utmp ();
+  if ((struct utmpx) { .ut_tv = { 0x80000000U, }, }.ut_tv.tv_sec <= 0)
+    link_failure_utmpx ();
+  if ((struct lastlog) { .ll_time = 0x80000000U, }.ll_time <= 0)
+    link_failure_lastlog ();
+  return 0;
+}
+
+#include <support/test-driver.c>