1 files changed, 71 insertions, 0 deletions
diff --git a/libstore/clone.c b/libstore/clone.c
new file mode 100644
index 00000000..a1817982
--- /dev/null
+++ b/libstore/clone.c
@@ -0,0 +1,71 @@
+/* Store cloning
+
+   Copyright (C) 1996 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   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 this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <string.h>
+
+#include "store.h"
+
+/* Return in TO a copy of FROM.  */
+error_t
+store_clone (struct store *from, struct store **to)
+{
+  struct store *c =
+    _make_store (from->class, from->meths, from->port, from->block_size,
+		 from->runs, from->runs_len, from->end);
+
+  if (! c)
+    return ENOMEM;
+
+  c->flags = from->flags;
+
+  if (from->misc_len)
+    {
+      c->misc = malloc (from->misc_len);
+      if (! c->misc)
+	err = ENOMEM;
+    }
+
+  if (!err && c->port != MACH_PORT_NULL)
+    {
+      err = mach_port_mod_refs (mach_task_self (),
+				c->port, MACH_PORT_RIGHT_SEND, 1);
+      if (err)
+	c->port = MACH_PORT_NULL; /* Don't deallocate it.  */
+    }
+  if (!err && from->source != MACH_PORT_NULL)
+    {
+      err = mach_port_mod_refs (mach_task_self (),
+				from->source, MACH_PORT_RIGHT_SEND, 1);
+      if (! err)
+	to->source = from->source;
+    }
+
+  if (!err && from->meths->clone)
+    err = (*from->meths->clone)(from, c);
+
+  if (err)
+    store_free (c);
+  else
+    *to = c;
+
+  return err;
+}