1 files changed, 53 insertions, 0 deletions
diff --git a/libdiskfs/io-map-cntl.c b/libdiskfs/io-map-cntl.c
new file mode 100644
index 00000000..b45ccffd
--- /dev/null
+++ b/libdiskfs/io-map-cntl.c
@@ -0,0 +1,53 @@
+/*
+   Copyright (C) 1994, 1996 Free Software Foundation, Inc.
+
+   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"
+#include "io_S.h"
+#include <mach/default_pager.h>
+
+/* Implement io_map_cntl as described in <hurd/io.defs>. */
+kern_return_t
+diskfs_S_io_map_cntl (struct protid *cred,
+		      memory_object_t *ctlobj,
+		      mach_msg_type_name_t *ctlobj_type)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+
+  assert (__vm_page_size >= sizeof (struct shared_io));
+  mutex_lock (&cred->po->np->lock);
+  if (!cred->mapped)
+    {
+      default_pager_object_create (diskfs_default_pager, &cred->shared_object,
+				   __vm_page_size);
+      vm_map (mach_task_self (), (u_int *)&cred->mapped, vm_page_size, 0, 1,
+	      cred->shared_object, 0, 0,
+	      VM_PROT_READ|VM_PROT_WRITE, VM_PROT_READ|VM_PROT_WRITE, 0);
+      cred->mapped->shared_page_magic = SHARED_PAGE_MAGIC;
+      cred->mapped->conch_status = USER_HAS_NOT_CONCH;
+      spin_lock_init (&cred->mapped->lock);
+      *ctlobj = cred->shared_object;
+      *ctlobj_type = MACH_MSG_TYPE_COPY_SEND;
+      mutex_unlock (&cred->po->np->lock);
+      return 0;
+    }
+  else
+    {
+      mutex_unlock (&cred->po->np->lock);
+      return EBUSY;
+    }
+}