1 files changed, 79 insertions, 0 deletions
diff --git a/gnulib-tests/test-getgroups.c b/gnulib-tests/test-getgroups.c
new file mode 100644
index 0000000..5c7bc5c
--- /dev/null
+++ b/gnulib-tests/test-getgroups.c
@@ -0,0 +1,79 @@
+/* Tests of getgroups.
+   Copyright (C) 2009-2020 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 (getgroups, int, (int, gid_t[]));
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "macros.h"
+
+int
+main (int argc, char **argv _GL_UNUSED)
+{
+  int result;
+  gid_t *groups;
+
+  errno = 0;
+  result = getgroups (0, NULL);
+  if (result == -1 && errno == ENOSYS)
+    {
+      fputs ("skipping test: no support for groups\n", stderr);
+      return 77;
+    }
+  ASSERT (0 <= result);
+  ASSERT (result + 1 < SIZE_MAX / sizeof *groups);
+  groups = malloc ((result + 1) * sizeof *groups);
+  ASSERT (groups);
+  groups[result] = -1;
+  /* Check for EINVAL handling.  Not all processes have supplemental
+     groups, and getgroups does not have to return the effective gid,
+     so a result of 0 is reasonable.  Also, we can't test for EINVAL
+     if result is 1, because of how getgroups treats 0.  */
+  if (1 < result)
+    {
+      errno = 0;
+      ASSERT (getgroups (result - 1, groups) == -1);
+      ASSERT (errno == EINVAL);
+    }
+  ASSERT (getgroups (result, groups) == result);
+  ASSERT (getgroups (result + 1, groups) == result);
+  ASSERT (groups[result] == -1);
+  errno = 0;
+  ASSERT (getgroups (-1, NULL) == -1);
+  ASSERT (errno == EINVAL);
+
+  /* The automated unit test, with no arguments, ends here.  However,
+     for debugging purposes, you can pass a command-line argument to
+     list the returned groups.  */
+  if (1 < argc)
+    {
+      int i;
+      for (i = 0; i < result; i++)
+        printf ("%d\n", (int) groups[i]);
+    }
+  free (groups);
+  return 0;
+}