1 files changed, 86 insertions, 0 deletions
diff --git a/gnulib-tests/test-getrusage.c b/gnulib-tests/test-getrusage.c
new file mode 100644
index 0000000..ef8c806
--- /dev/null
+++ b/gnulib-tests/test-getrusage.c
@@ -0,0 +1,86 @@
+/* Test of getting resource utilization.
+   Copyright (C) 2012-2022 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 Bruno Haible <bruno@clisp.org>, 2012.  */
+
+#include <config.h>
+
+#include <sys/resource.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (getrusage, int, (int, struct rusage *));
+
+#include <sys/time.h>
+
+#include "macros.h"
+
+volatile unsigned int counter;
+
+int
+main (void)
+{
+  struct rusage before;
+  struct rusage after;
+  int ret;
+
+  ret = getrusage (RUSAGE_SELF, &before);
+  ASSERT (ret == 0);
+
+  /* Busy-loop for one second.  */
+  {
+    struct timeval t0;
+    ASSERT (gettimeofday (&t0, NULL) == 0);
+
+    for (;;)
+      {
+        struct timeval t;
+        int i;
+
+        for (i = 0; i < 1000000; i++)
+          counter++;
+
+        ASSERT (gettimeofday (&t, NULL) == 0);
+        if (t.tv_sec - t0.tv_sec > 1
+            || (t.tv_sec - t0.tv_sec == 1 && t.tv_usec >= t0.tv_usec))
+          break;
+      }
+  }
+
+  ret = getrusage (RUSAGE_SELF, &after);
+  ASSERT (ret == 0);
+
+  ASSERT (after.ru_utime.tv_sec >= before.ru_utime.tv_sec);
+  ASSERT (after.ru_stime.tv_sec >= before.ru_stime.tv_sec);
+  {
+    /* Compute time spent during busy-looping (in usec).  */
+    unsigned int spent_utime =
+      (after.ru_utime.tv_sec > before.ru_utime.tv_sec
+       ? (after.ru_utime.tv_sec - before.ru_utime.tv_sec - 1) * 1000000U
+         + after.ru_utime.tv_usec + (1000000U - before.ru_utime.tv_usec)
+       : after.ru_utime.tv_usec - before.ru_utime.tv_usec);
+    unsigned int spent_stime =
+      (after.ru_stime.tv_sec > before.ru_stime.tv_sec
+       ? (after.ru_stime.tv_sec - before.ru_stime.tv_sec - 1) * 1000000U
+         + after.ru_stime.tv_usec + (1000000U - before.ru_stime.tv_usec)
+       : after.ru_stime.tv_usec - before.ru_stime.tv_usec);
+
+    ASSERT (spent_utime + spent_stime <= 2 * 1000000U);
+    /* Assume that the load during this busy-looping was less than 100.  */
+    ASSERT (spent_utime + spent_stime > 10000U);
+  }
+
+  return 0;
+}