[glibc] tst: Add test for futimens

[glibc] tst: Add test for futimens

[Lukasz Majewski]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e0685bacd585df63a7236b7f117f8c3ca8c38dad

commit e0685bacd585df63a7236b7f117f8c3ca8c38dad
Author: Lukasz Majewski <lukma@denx.de>
Date:   Mon Feb 8 10:58:44 2021 +0100

    tst: Add test for futimens
    
    This patch provides test for futimens. It uses wrapper, which
    reads access and modification time to compare them with ones
    written by futimens.
    
    Moreover, access and modification times beyond the Y2038 threshold
    date (i.e. 32 bit time_t overflow) are also checked.
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 sysdeps/unix/sysv/linux/Makefile       |  2 +-
 sysdeps/unix/sysv/linux/tst-futimens.c | 84 ++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 488114a41e..2c96599d88 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -107,7 +107,7 @@ 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-timerfd tst-ppoll tst-futimens
 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-futimens.c b/sysdeps/unix/sysv/linux/tst-futimens.c
new file mode 100644
index 0000000000..8f48cfee63
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-futimens.c
@@ -0,0 +1,84 @@
+/* Test for futimens
+   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 <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <support/check.h>
+#include <support/xunistd.h>
+#include <support/temp_file.h>
+
+static int temp_fd = -1;
+
+/* struct timespec array with Y2038 threshold minus 2 and 1 seconds.  */
+const struct timespec t1[2] = { { 0x7FFFFFFE, 0 },  { 0x7FFFFFFF, 0 } };
+
+/* struct timespec array with Y2038 threshold plus 1 and 2 seconds.  */
+const struct timespec t2[2] = { { 0x80000001ULL, 0 },  { 0x80000002ULL, 0 } };
+
+/* struct timespec array around Y2038 threshold.  */
+const struct timespec t3[2] = { { 0x7FFFFFFE, 0 },  { 0x80000002ULL, 0 } };
+
+#define PREPARE do_prepare
+static void
+do_prepare (int argc, char *argv[])
+{
+  temp_fd = create_temp_file ("futimensat", NULL);
+  TEST_VERIFY_EXIT (temp_fd > 0);
+}
+
+static int
+test_futimens_helper (const struct timespec *ts)
+{
+  struct stat64 st;
+  int result;
+  time_t t;
+
+  /* Check if we run on port with 32 bit time_t size */
+  if (__builtin_add_overflow (ts->tv_sec, 0, &t))
+    {
+      printf("time_t overflow!");
+      return 0;
+    }
+
+  result = futimens (temp_fd, ts);
+  TEST_VERIFY_EXIT (result == 0);
+
+  xfstat (temp_fd, &st);
+
+  /* Check if seconds for atime match */
+  TEST_COMPARE (st.st_atime, ts[0].tv_sec);
+
+  /* Check if seconds for mtime match */
+  TEST_COMPARE (st.st_mtime, ts[1].tv_sec);
+
+  return 0;
+}
+
+static int
+do_test (void)
+{
+  test_futimens_helper (&t1[0]);
+  test_futimens_helper (&t2[0]);
+  test_futimens_helper (&t3[0]);
+
+  return 0;
+}
+
+#include <support/test-driver.c>