linux: Add y2106 support on utimensat tests

The tests are refactored to use a common skeleton that handles whether
the underlying filesystem supports 64 bit time, skips 64 bit time
tests when the TU only supports 32 bit, and also skip 64 bit time
tests larger than 32 unsigned int (y2106) if the system does not
support it (MIPSn64 on kernels without statx support).

Checked on x86_64-linux-gnu and i686-linux-gnu.  I also checked
on a mips64el-linux-gnu with 4.1.4 and 5.10.0-4-5kc-malta kernel
to verify if the y2106 are indeed skipped.

1 files changed, 91 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/tst-utimensat-skeleton.c b/sysdeps/unix/sysv/linux/tst-utimensat-skeleton.c
new file mode 100644
index 0000000000..3589146db5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-utimensat-skeleton.c
@@ -0,0 +1,91 @@
+/* Common tests for utimensat routines.
+   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 <array_length.h>
+#include <inttypes.h>
+#include <support/support.h>
+#include <support/temp_file.h>
+#include <stdio.h>
+
+static int temp_fd = -1;
+static char *testfile;
+
+const static struct {
+  int64_t v1;
+  int64_t v2;
+} tests[] = {
+  /* Y2038 threshold minus 2 and 1 seconds.  */
+  { 0x7FFFFFFELL, 0x7FFFFFFFLL },
+  /* Y2038 threshold plus 1 and 2 seconds.  */
+  { 0x80000001LL, 0x80000002LL },
+  /* Around Y2038 threshold.  */
+  { 0x7FFFFFFELL, 0x80000002LL },
+  /* Y2106 threshold minus 2 and 1 seconds.  */
+  { 0x100000000LL, 0xFFFFFFFELL },
+  /* Y2106 threshold plus 1 and 2 seconds.  */
+  { 0x100000001LL, 0x100000002LL },
+  /* Around Y2106 threshold.  */
+  { 0xFFFFFFFELL, 0xFFFFFFFELL },
+};
+
+#define PREPARE do_prepare
+static void
+do_prepare (int argc, char *argv[])
+{
+  temp_fd = create_temp_file ("utime", &testfile);
+  TEST_VERIFY_EXIT (temp_fd > 0);
+}
+
+static int
+do_test (void)
+{
+  if (!support_path_support_time64 (testfile))
+    FAIL_UNSUPPORTED ("File %s does not support 64-bit timestamps",
+		      testfile);
+
+  bool y2106 = support_path_support_time64_value (testfile,
+						  0x100000001LL,
+						  0x100000002LL);
+
+  for (int i = 0; i < array_length (tests); i++)
+    {
+      /* Check if we run on port with 32 bit time_t size.  */
+      time_t t;
+      if (__builtin_add_overflow (tests[i].v1, 0, &t)
+	  || __builtin_add_overflow (tests[i].v2, 0, &t))
+        {
+          printf ("warning: skipping tests[%d] { %" PRIx64 ", %" PRIx64 " }: "
+		  "time_t overflows\n", i, tests[i].v1, tests[i].v2);
+	  continue;
+        }
+
+      if (tests[i].v1 >= 0x100000000LL && !y2106)
+	{
+          printf ("warning: skipping tests[%d] { %" PRIx64 ", %" PRIx64 " }: "
+		  "unsupported timestamp value\n",
+		  i, tests[i].v1, tests[i].v2);
+	  continue;
+	}
+
+      TEST_CALL (testfile, temp_fd, tests[i].v1, tests[i].v2);
+    }
+
+  return 0;
+}
+
+#include <support/test-driver.c>