1 files changed, 40 insertions, 0 deletions
diff --git a/src/gl/tests/test-usleep.c b/src/gl/tests/test-usleep.c
new file mode 100644
index 0000000..63192fb
--- /dev/null
+++ b/src/gl/tests/test-usleep.c
@@ -0,0 +1,40 @@
+/* Test of usleep() function.
+   Copyright (C) 2009-2021 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (usleep, int, (useconds_t));
+
+#include <time.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+  time_t start = time (NULL);
+  ASSERT (usleep (1000000) == 0);
+  ASSERT (start < time (NULL));
+
+  ASSERT (usleep (0) == 0);
+
+  return 0;
+}