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-rw-r--r--time/tst-adjtime.c44
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diff --git a/time/tst-adjtime.c b/time/tst-adjtime.c
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+/* Basic tests for adjtime.
+ Copyright (C) 2020 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 <sys/time.h>
+#include <stdlib.h>
+
+#include <errno.h>
+#include <support/check.h>
+
+
+static int
+do_test (void)
+{
+ /* Check if the interface allows getting the amount of time remaining
+ from any previous adjustment that has not yet been completed. This
+ is a non-privileged function of adjtime. */
+ struct timeval tv;
+ int r = adjtime (NULL, &tv);
+ if (r == -1)
+ {
+ if (errno == ENOSYS)
+ FAIL_UNSUPPORTED ("adjtime unsupported");
+ FAIL_EXIT1 ("adjtime (NULL, ...) failed: %m");
+ }
+
+ return 0;
+}
+
+#include <support/test-driver.c>