1 files changed, 43 insertions, 0 deletions
diff --git a/rt/tst-clock2.c b/rt/tst-clock2.c
new file mode 100644
index 0000000000..4c8fb9f247
--- /dev/null
+++ b/rt/tst-clock2.c
@@ -0,0 +1,43 @@
+/* Test setting the monotonic clock.  */
+
+#include <time.h>
+#include <unistd.h>
+
+#if defined CLOCK_MONOTONIC && defined _POSIX_MONOTONIC_CLOCK
+
+# include <errno.h>
+# include <stdio.h>
+
+static int
+do_test (void)
+{
+  if (sysconf (_SC_MONOTONIC_CLOCK) <= 0)
+    return 0;
+
+  struct timespec ts;
+  if (clock_gettime (CLOCK_MONOTONIC, &ts) != 0)
+    {
+      puts ("clock_gettime(CLOCK_MONOTONIC) failed");
+      return 1;
+    }
+
+  /* Setting the monotonic clock must fail.  */
+  if (clock_settime (CLOCK_MONOTONIC, &ts) != -1)
+    {
+      puts ("clock_settime(CLOCK_MONOTONIC) did not fail");
+      return 1;
+    }
+  if (errno != EINVAL)
+    {
+      printf ("clock_settime(CLOCK_MONOTONIC) set errno to %d, expected %d\n",
+	      errno, EINVAL);
+      return 1;
+    }
+  return 0;
+}
+# define TEST_FUNCTION do_test ()
+
+#else
+# define TEST_FUNCTION	0
+#endif
+#include "../test-skeleton.c"