1 files changed, 67 insertions, 0 deletions
diff --git a/libtrivfs/protid-dup.c b/libtrivfs/protid-dup.c
new file mode 100644
index 00000000..097ab55b
--- /dev/null
+++ b/libtrivfs/protid-dup.c
@@ -0,0 +1,67 @@
+/* Duplicate a protid
+
+   Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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.
+
+   The GNU Hurd 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 the GNU Hurd; see the file COPYING.  If not, write to
+   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <string.h>
+#include "priv.h"
+
+/* Return a duplicate of CRED in DUP, sharing the same peropen and hook.  A
+   non-null hook may be used to detect that this is a duplicate by
+   trivfs_protid_create_hook.  */
+error_t
+trivfs_protid_dup (struct trivfs_protid *cred, struct trivfs_protid **dup)
+{
+  struct trivfs_protid *new;
+  error_t err = ports_create_port (cred->po->cntl->protid_class,
+				   cred->po->cntl->protid_bucket,
+				   sizeof (struct trivfs_protid), 
+				   &new);
+
+  if (! err)
+    {
+      mutex_lock (&cred->po->cntl->lock);
+      new->po = cred->po;
+      new->po->refcnt++;
+      mutex_unlock (&cred->po->cntl->lock);
+
+      new->isroot = cred->isroot;
+
+      new->user = iohelp_dup_iouser (cred->user);
+
+      new->realnode = cred->realnode;
+      mach_port_mod_refs (mach_task_self (), new->realnode,
+			  MACH_PORT_RIGHT_SEND, 1);
+
+      new->hook = cred->hook;
+
+      if (trivfs_protid_create_hook)
+	err = (*trivfs_protid_create_hook) (new);
+      if (err)
+	{
+	  mach_port_deallocate (mach_task_self (), new->realnode);
+	  /* Signal that the user destroy hook shouldn't be called on NEW.  */
+	  new->realnode = MACH_PORT_NULL;
+	  ports_port_deref (new);
+	}
+      else
+	*dup = new;
+    }
+
+  return err;
+}