1 files changed, 63 insertions, 0 deletions
diff --git a/hurd/getuids.c b/hurd/getuids.c
new file mode 100644
index 0000000000..9a62f65611
--- /dev/null
+++ b/hurd/getuids.c
@@ -0,0 +1,63 @@
+/* Copyright (C) 1993, 1994 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 <hurd.h>
+#include <hurd/id.h>
+#include <string.h>
+
+int
+__getuids (int n, uid_t *uidset)
+{
+  error_t err;
+  int nuids;
+  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);
+    }
+
+  nuids = _hurd_id.gen.nuids;
+
+  if (n != 0)
+    {
+      /* Copy the uids onto stack storage and then release the idlock.  */
+      uid_t uids[nuids];
+      memcpy (uids, _hurd_id.gen.uids, sizeof (uids));
+      __mutex_unlock (&_hurd_id.lock);
+      _hurd_critical_section_unlock (crit);
+
+      /* Now that the lock is released, we can safely copy the
+	 uid set into the user's array, which might fault.  */
+      if (nuids > n)
+	nuids = n;
+      memcpy (uidset, uids, nuids * sizeof (uid_t));
+    }
+  else
+    {
+      __mutex_unlock (&_hurd_id.lock);
+      _hurd_critical_section_unlock (crit);
+    }
+
+  return nuids;
+}