1 files changed, 68 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/getgroups.c b/sysdeps/mach/hurd/getgroups.c
new file mode 100644
index 0000000000..d985d29317
--- /dev/null
+++ b/sysdeps/mach/hurd/getgroups.c
@@ -0,0 +1,68 @@
+/* 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>
+#include <string.h>
+
+int
+__getgroups (int n, gid_t *gidset)
+{
+  error_t err;
+  int ngids;
+  void *crit;
+
+  crit = _hurd_critical_section_lock ();
+  __mutex_lock (&_hurd_id.lock);
+
+  if (err = _hurd_check_ids ())
+    {
+      __mutex_unlock (&_hurd_id.lock);
+      _hurd_critical_section_unlock (crit);
+      return __hurd_fail (err);
+    }
+
+  ngids = _hurd_id.gen.ngids;
+
+  if (n != 0)
+    {
+      /* Copy the gids onto stack storage and then release the idlock.  */
+      gid_t gids[ngids];
+      memcpy (gids, _hurd_id.gen.gids, sizeof (gids));
+      __mutex_unlock (&_hurd_id.lock);
+      _hurd_critical_section_unlock (crit);
+
+      /* Now that the lock is released, we can safely copy the
+	 group set into the user's array, which might fault.  */
+      if (ngids > n)
+	ngids = n;
+      memcpy (gidset, gids, ngids * sizeof (gid_t));
+    }
+  else
+    {
+      __mutex_unlock (&_hurd_id.lock);
+      _hurd_critical_section_unlock (crit);
+    }
+
+  return ngids;
+}
+
+weak_alias (__getgroups, getgroups)