[glibc/azanella/y2038] tst: Add test for utimes

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=98fea27115bdfbae70608b6a6512f54c4aa10642

commit 98fea27115bdfbae70608b6a6512f54c4aa10642
Author: Lukasz Majewski <lukma@denx.de>
Date:   Fri Feb 26 09:09:55 2021 -0300

    tst: Add test for utimes
    
    This patch provides test for utimes. It uses xfstat() syscall to read
    access and modification times to compare with ones written by utimes.
    
    Moreover, access and modification times beyond the Y2038 threshold
    date (i.e. 32 bit time_t overflow) are also checked.

Diff:
---
 sysdeps/unix/sysv/linux/Makefile     |  3 +-
 sysdeps/unix/sysv/linux/tst-utimes.c | 84 ++++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index ab42a53238..ca587858d8 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -107,7 +107,8 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
 	 test-errno-linux tst-memfd_create tst-mlock2 tst-pkey \
 	 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-timerfd tst-ppoll tst-futimens tst-clock_adjtime tst-utime \
+	 tst-utimes
 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-utimes.c b/sysdeps/unix/sysv/linux/tst-utimes.c
new file mode 100644
index 0000000000..db43660262
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-utimes.c
@@ -0,0 +1,84 @@
+/* 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>
+
+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)
+{
+  struct stat64 st;
+  int result;
+  time_t t;
+
+  /* Check if we run on port with 32 bit time_t size */
+  if (__builtin_add_overflow (tv->tv_sec, 0, &t))
+    return 0;
+
+  result = utimes(testfile, tv);
+  TEST_VERIFY_EXIT (result == 0);
+
+  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>