1 files changed, 83 insertions, 0 deletions
diff --git a/gnulib-tests/test-getloadavg.c b/gnulib-tests/test-getloadavg.c
new file mode 100644
index 0000000..6a3ee09
--- /dev/null
+++ b/gnulib-tests/test-getloadavg.c
@@ -0,0 +1,83 @@
+/* Test of getting load average.
+   Copyright (C) 2011-2023 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/>.  */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (getloadavg, int, (double [], int));
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+static void
+check_avg (int minutes, double avg, int printit)
+{
+  if (printit)
+    printf ("%d-minute: %f  ", minutes, avg);
+  else
+    {
+      /* Plausibility checks.  */
+      if (avg < 0.01)
+        printf ("suspiciously low %d-minute average: %f\n", minutes, avg);
+      if (avg > 1000000)
+        printf ("suspiciously high %d-minute average: %f\n", minutes, avg);
+    }
+  if (avg < 0 || avg != avg)
+    exit (minutes);
+}
+
+/* This program can also be used as a manual test, by invoking it with
+   an argument; it then prints the load average.  If the argument is
+   nonzero, the manual test repeats forever, sleeping for the stated
+   interval between each iteration.  */
+int
+main (int argc, char **argv)
+{
+  int naptime = 0;
+
+  if (argc > 1)
+    naptime = atoi (argv[1]);
+
+  while (1)
+    {
+      double avg[3];
+      int loads = getloadavg (avg, 3);
+      if (loads == -1)
+        {
+          if (! (errno == ENOSYS || errno == ENOTSUP || errno == ENOENT))
+            return 1;
+          perror ("Skipping test; load average not supported");
+          return 77;
+        }
+      if (loads > 0)
+        check_avg (1, avg[0], argc > 1);
+      if (loads > 1)
+        check_avg (5, avg[1], argc > 1);
+      if (loads > 2)
+        check_avg (15, avg[2], argc > 1);
+      if (loads > 0 && argc > 1)
+        putchar ('\n');
+
+      if (naptime == 0)
+        break;
+      sleep (naptime);
+    }
+
+  return 0;
+}