1 files changed, 86 insertions, 0 deletions
diff --git a/libtrivfs/migsupport.c b/libtrivfs/migsupport.c
new file mode 100644
index 00000000..b2d98e16
--- /dev/null
+++ b/libtrivfs/migsupport.c
@@ -0,0 +1,86 @@
+/* 
+   Copyright (C) 1994, 1995, 1996, 1997, 1999 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program 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
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+struct trivfs_protid *
+trivfs_begin_using_protid (mach_port_t port)
+{
+  if (trivfs_protid_nportclasses + trivfs_num_dynamic_protid_port_classes > 1)
+    {
+      struct port_info *pi = ports_lookup_port (0, port, 0);
+      int i;
+
+      if (pi)
+	{
+	  for (i = 0; i < trivfs_protid_nportclasses; i++)
+	    if (pi->class == trivfs_protid_portclasses[i])
+	      return (struct trivfs_protid *) pi;
+	  for (i = 0; i < trivfs_num_dynamic_protid_port_classes; i++)
+	    if (pi->class == trivfs_dynamic_protid_port_classes[i])
+	      return (struct trivfs_protid *) pi;
+	  ports_port_deref (pi);
+	}
+      
+      return 0;
+    }
+  else if (trivfs_protid_nportclasses == 1)
+    return ports_lookup_port (0, port, trivfs_protid_portclasses[0]);
+  else
+    return ports_lookup_port (0, port, trivfs_dynamic_protid_port_classes[0]);
+}
+
+void 
+trivfs_end_using_protid (struct trivfs_protid *cred)
+{
+  if (cred)
+    ports_port_deref (cred);
+}
+
+struct trivfs_control *
+trivfs_begin_using_control (mach_port_t port)
+{
+  if (trivfs_cntl_nportclasses + trivfs_num_dynamic_control_port_classes > 1)
+    {
+      struct port_info *pi = ports_lookup_port (0, port, 0);
+      int i;
+
+      if (pi)
+	{
+	  for (i = 0; i < trivfs_cntl_nportclasses; i++)
+	    if (pi->class == trivfs_cntl_portclasses[i])
+	      return (struct trivfs_control *) pi;
+	  for (i = 0; i < trivfs_num_dynamic_control_port_classes; i++)
+	    if (pi->class == trivfs_dynamic_control_port_classes[i])
+	      return (struct trivfs_control *) pi;
+	  ports_port_deref (pi);
+	}
+      
+      return 0;
+    }
+  else if (trivfs_cntl_nportclasses == 1)
+    return ports_lookup_port (0, port, trivfs_cntl_portclasses[0]);
+  else
+    return ports_lookup_port (0, port, trivfs_dynamic_control_port_classes[0]);
+}
+
+void 
+trivfs_end_using_control (struct trivfs_control *cred)
+{
+  if (cred)
+    ports_port_deref (cred);
+}