1 files changed, 62 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/getresgid.c b/sysdeps/mach/hurd/getresgid.c
new file mode 100644
index 0000000000..a96aa49369
--- /dev/null
+++ b/sysdeps/mach/hurd/getresgid.c
@@ -0,0 +1,62 @@
+/* getresgid -- fetch effective group ID, real group ID, and saved-set group ID
+   Copyright (C) 2002 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>
+
+/* Fetch the effective group ID, real group ID, and saved-set group ID,
+   of the calling process.  */
+int
+__getresgid (gid_t *egid, gid_t *rgid, gid_t *sgid)
+{
+  error_t err;
+  gid_t eff, real, saved;
+
+  HURD_CRITICAL_BEGIN;
+  __mutex_lock (&_hurd_id.lock);
+
+  err = _hurd_check_ids ();
+  if (!err)
+    {
+      if (_hurd_id.aux.ngids < 1)
+	/* We do not even have a real GID.  */
+	err = EGRATUITOUS;
+      else
+	{
+	  real = _hurd_id.aux.gids[0];
+	  saved = _hurd_id.aux.ngids < 2 ? real :_hurd_id.aux.gids[1];
+	  eff = _hurd_id.gen.ngids < 1 ? real : _hurd_id.gen.gids[0];
+	}
+    }
+
+  __mutex_unlock (&_hurd_id.lock);
+  HURD_CRITICAL_END;
+
+  if (err)
+    return __hurd_fail (err);
+
+  *egid = eff;
+  *rgid = real;
+  *sgid = saved;
+  return 0;
+}
+libc_hidden_def (__getresgid)
+weak_alias (__getresgid, getresgid)