1 files changed, 55 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/getgid.c b/sysdeps/mach/hurd/getgid.c
new file mode 100644
index 0000000000..0d1b27f8e6
--- /dev/null
+++ b/sysdeps/mach/hurd/getgid.c
@@ -0,0 +1,55 @@
+/* Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <hurd.h>
+#include <hurd/id.h>
+
+/* Get the real group ID of the calling process.  */
+gid_t
+DEFUN_VOID(__getgid)
+{
+  error_t err;
+  gid_t gid;
+
+  HURD_CRITICAL_BEGIN;
+  __mutex_lock (&_hurd_id.lock);
+
+  if (err = _hurd_check_ids ())
+    {
+      errno = err;
+      gid = -1;
+    }
+  else if (_hurd_id.aux.ngids >= 1)
+    gid = _hurd_id.aux.gids[0];
+  else
+    {
+      /* We do not even have a real gid.  */
+      errno = EGRATUITOUS;
+      gid = -1;
+    }
+
+  __mutex_unlock (&_hurd_id.lock);
+  HURD_CRITICAL_END;
+
+  return gid;
+}
+
+weak_alias (__getgid, getgid)