[glibc/azanella/y2038] linux: Add futimes test

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=707449eec5b7df5616d4f77755155f1b60a87f9d

commit 707449eec5b7df5616d4f77755155f1b60a87f9d
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Fri Feb 26 20:14:18 2021 -0300

    linux: Add futimes test
    
    It uses stat to compare against the values set by futimes.

Diff:
---
 sysdeps/unix/sysv/linux/Makefile      |  2 +-
 sysdeps/unix/sysv/linux/tst-futimes.c | 85 +++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index ca587858d8..f5c37d3a10 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -108,7 +108,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
 	 tst-rlimit-infinity tst-ofdlocks tst-gettid tst-gettid-kill \
 	 tst-tgkill tst-sysvsem-linux tst-sysvmsg-linux tst-sysvshm-linux \
 	 tst-timerfd tst-ppoll tst-futimens tst-clock_adjtime tst-utime \
-	 tst-utimes
+	 tst-utimes tst-futimes
 tests-internal += tst-ofdlocks-compat tst-sigcontext-get_pc
 
 CFLAGS-tst-sigcontext-get_pc.c = -fasynchronous-unwind-tables
diff --git a/sysdeps/unix/sysv/linux/tst-futimes.c b/sysdeps/unix/sysv/linux/tst-futimes.c
new file mode 100644
index 0000000000..026b0af023
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-futimes.c
@@ -0,0 +1,85 @@
+/* Basix test for utimes.
+   Copyright (C) 2021 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 <time.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <support/check.h>
+#include <support/xunistd.h>
+#include <support/temp_file.h>
+
+#ifndef struct_stat
+# define struct_stat struct stat64
+#endif
+
+static int temp_fd = -1;
+static char *testfile;
+
+/* struct timeval array with Y2038 threshold minus 2 and 1 seconds.  */
+const static struct timeval t1[2] = { { 0x7FFFFFFE, 0 },  { 0x7FFFFFFF, 0 } };
+
+/* struct timeval array with Y2038 threshold plus 1 and 2 seconds.  */
+const static struct timeval t2[2] = { { 0x80000001ULL, 0 },
+				      { 0x80000002ULL, 0 } };
+
+/* struct timeval array around Y2038 threshold.  */
+const static struct timeval t3[2] = { { 0x7FFFFFFE, 0 },
+				      { 0x80000002ULL, 0 } };
+
+#define PREPARE do_prepare
+static void
+do_prepare (int argc, char *argv[])
+{
+  temp_fd = create_temp_file ("utimes", &testfile);
+  TEST_VERIFY_EXIT (temp_fd > 0);
+}
+
+static int
+test_utime_helper (const struct timeval *tv)
+{
+  /* Check if we run on port with 32 bit time_t size */
+  time_t t;
+  if (__builtin_add_overflow (tv->tv_sec, 0, &t))
+    return 0;
+
+  TEST_VERIFY_EXIT (futimes (temp_fd, tv) == 0);
+
+  struct_stat st;
+  xfstat (temp_fd, &st);
+
+  /* Check if seconds for atime match */
+  TEST_COMPARE (st.st_atime, tv[0].tv_sec);
+
+  /* Check if seconds for mtime match */
+  TEST_COMPARE (st.st_mtime, tv[1].tv_sec);
+
+  return 0;
+}
+
+static int
+do_test (void)
+{
+  test_utime_helper (&t1[0]);
+  test_utime_helper (&t2[0]);
+  test_utime_helper (&t3[0]);
+
+  return 0;
+}
+
+#include <support/test-driver.c>