2011-05-13 Sebastian Huber <sebastian.huber@embedded-brains.de>

* libmisc/devnull/devzero.c, libmisc/devnull/devzero.h: New files.
	* libmisc/Makefile.am, Makefile.am, preinstall.am: Reflect changes
	above.

cpukit/libmisc/devnull/devzero.c

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2011 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ *
+ * $Id$
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/devzero.h>
+
+#include <string.h>
+
+#include <rtems/libio.h>
+
+rtems_device_driver dev_zero_initialize(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor __attribute__((unused)),
+  void *arg __attribute__((unused))
+)
+{
+  return rtems_io_register_name(DEVZERO_DEVICE_NAME, major, 0);
+}
+
+rtems_device_driver dev_zero_open(
+  rtems_device_major_number major __attribute__((unused)),
+  rtems_device_minor_number minor __attribute__((unused)),
+  void *arg __attribute__((unused))
+)
+{
+  return RTEMS_SUCCESSFUL;
+}
+
+rtems_device_driver dev_zero_close(
+  rtems_device_major_number major __attribute__((unused)),
+  rtems_device_minor_number minor __attribute__((unused)),
+  void *arg __attribute__((unused))
+)
+{
+  return RTEMS_SUCCESSFUL;
+}
+
+rtems_device_driver dev_zero_read(
+  rtems_device_major_number major __attribute__((unused)),
+  rtems_device_minor_number minor __attribute__((unused)),
+  void *arg __attribute__((unused))
+)
+{
+  rtems_libio_rw_args_t *rw = arg;
+
+  rw->bytes_moved = rw->count;
+  memset(rw->buffer, 0, rw->count);
+
+  return RTEMS_SUCCESSFUL;
+}
+
+rtems_device_driver dev_zero_write(
+  rtems_device_major_number major __attribute__((unused)),
+  rtems_device_minor_number minor __attribute__((unused)),
+  void *arg
+)
+{
+  rtems_libio_rw_args_t *rw = arg;
+
+  rw->bytes_moved = rw->count;
+
+  return RTEMS_SUCCESSFUL;
+}
+
+rtems_device_driver dev_zero_control(
+  rtems_device_major_number major __attribute__((unused)),
+  rtems_device_minor_number minor __attribute__((unused)),
+  void *arg __attribute__((unused))
+)
+{
+  return RTEMS_IO_ERROR;
+}