support: Add xclock_gettime

	* support/xclock_gettime.c (xclock_gettime): New file. Provide
	clock_gettime wrapper for use in tests that fails the test rather
	than returning failure.

	* support/xtime.h: New file to declare xclock_gettime.

	* support/Makefile: Add xclock_gettime.c.

	* support/README: Mention xtime.h.

1 files changed, 31 insertions, 0 deletions

diff --git a/support/xclock_gettime.c b/support/xclock_gettime.c
new file mode 100644
index 0000000000..0961e757fd
--- /dev/null
+++ b/support/xclock_gettime.c
@@ -0,0 +1,31 @@
+/* clock_gettime with error checking.
+   Copyright (C) 2019 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/check.h>
+#include <support/xtime.h>
+#include <support/xthread.h>
+
+void
+xclock_gettime (clockid_t clockid,
+                struct timespec *ts)
+{
+  const int ret = clock_gettime (clockid, ts);
+  if (ret < 0)
+    FAIL_EXIT1 ("clock_gettime (%d): %m",
+                clockid);
+}