1 files changed, 54 insertions, 0 deletions
diff --git a/libc/sysdeps/mach/hurd/getgid.c b/libc/sysdeps/mach/hurd/getgid.c
new file mode 100644
index 000000000..b9e24ae4f
--- /dev/null
+++ b/libc/sysdeps/mach/hurd/getgid.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 1993, 1994, 1995, 1997 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <hurd.h>
+#include <hurd/id.h>
+
+/* Get the real group ID of the calling process.  */
+gid_t
+__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)