1 files changed, 83 insertions, 0 deletions
diff --git a/tests/test-nanosleep.c b/tests/test-nanosleep.c
new file mode 100644
index 0000000..c03a2c2
--- /dev/null
+++ b/tests/test-nanosleep.c
@@ -0,0 +1,83 @@
+/* Test of nanosleep() function.
+   Copyright (C) 2009-2022 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 <time.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (nanosleep, int, (struct timespec const *, struct timespec *));
+
+#include <errno.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include "macros.h"
+
+#if HAVE_DECL_ALARM
+static void
+handle_alarm (int sig)
+{
+  if (sig != SIGALRM)
+    _exit (1);
+}
+#endif
+
+int
+main (void)
+{
+  struct timespec ts;
+
+  ts.tv_sec = 1000;
+  ts.tv_nsec = -1;
+  errno = 0;
+  ASSERT (nanosleep (&ts, NULL) == -1);
+  ASSERT (errno == EINVAL);
+  ts.tv_nsec = 1000000000;
+  errno = 0;
+  ASSERT (nanosleep (&ts, NULL) == -1);
+  ASSERT (errno == EINVAL);
+
+  ts.tv_sec = 0;
+  ts.tv_nsec = 1;
+  ASSERT (nanosleep (&ts, &ts) == 0);
+  /* Remaining time is only defined on EINTR failure; but on success,
+     it is typically either 0 or unchanged from input.  At any rate,
+     it shouldn't be randomly changed to unrelated values.  */
+  ASSERT (ts.tv_sec == 0);
+  ASSERT (ts.tv_nsec == 0 || ts.tv_nsec == 1);
+  ts.tv_nsec = 0;
+  ASSERT (nanosleep (&ts, NULL) == 0);
+
+#if HAVE_DECL_ALARM
+  {
+    const time_t pentecost = 50 * 24 * 60 * 60; /* 50 days.  */
+    signal (SIGALRM, handle_alarm);
+    alarm (1);
+    ts.tv_sec = pentecost;
+    ts.tv_nsec = 999999999;
+    errno = 0;
+    ASSERT (nanosleep (&ts, &ts) == -1);
+    ASSERT (errno == EINTR);
+    ASSERT (pentecost - 10 < ts.tv_sec && ts.tv_sec <= pentecost);
+    ASSERT (0 <= ts.tv_nsec && ts.tv_nsec <= 999999999);
+  }
+#endif
+
+  return 0;
+}