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-rw-r--r--cpukit/libmisc/devnull/devnull.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/cpukit/libmisc/devnull/devnull.c b/cpukit/libmisc/devnull/devnull.c
new file mode 100644
index 0000000000..4b22199814
--- /dev/null
+++ b/cpukit/libmisc/devnull/devnull.c
@@ -0,0 +1,184 @@
+/* /dev/null
+ *
+ * Derived from rtems' stub driver.
+ *
+ * Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de)
+ *
+ * COPYRIGHT (c) 1989-2000.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * 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.h>
+#include <rtems/devnull.h>
+#include <rtems/libio.h>
+
+/* null_initialize
+ *
+ * This routine is the null device driver init routine.
+ *
+ * Input parameters:
+ * major - device major number
+ * minor - device minor number
+ * pargp - pointer to parameter block
+ *
+ * Output parameters:
+ * rval - NULL_SUCCESSFUL
+ */
+
+uint32_t NULL_major;
+static char initialized;
+
+rtems_device_driver null_initialize(
+ rtems_device_major_number major,
+ rtems_device_minor_number minor __attribute__((unused)),
+ void *pargp __attribute__((unused))
+)
+{
+ rtems_device_driver status;
+
+ if ( !initialized ) {
+ initialized = 1;
+
+ status = rtems_io_register_name(
+ "/dev/null",
+ major,
+ (rtems_device_minor_number) 0
+ );
+
+ if (status != RTEMS_SUCCESSFUL)
+ rtems_fatal_error_occurred(status);
+
+ NULL_major = major;
+ }
+
+ return RTEMS_SUCCESSFUL;
+}
+
+/* null_open
+ *
+ * This routine is the null device driver open routine.
+ *
+ * Input parameters:
+ * major - device major number
+ * minor - device minor number
+ * pargb - pointer to open parameter block
+ *
+ * Output parameters:
+ * rval - NULL_SUCCESSFUL
+ */
+
+rtems_device_driver null_open(
+ rtems_device_major_number major __attribute__((unused)),
+ rtems_device_minor_number minor __attribute__((unused)),
+ void *pargp __attribute__((unused))
+)
+{
+ return NULL_SUCCESSFUL;
+}
+
+
+/* null_close
+ *
+ * This routine is the null device driver close routine.
+ *
+ * Input parameters:
+ * major - device major number
+ * minor - device minor number
+ * pargb - pointer to close parameter block
+ *
+ * Output parameters:
+ * rval - NULL_SUCCESSFUL
+ */
+
+rtems_device_driver null_close(
+ rtems_device_major_number major __attribute__((unused)),
+ rtems_device_minor_number minor __attribute__((unused)),
+ void *pargp __attribute__((unused))
+)
+{
+ return NULL_SUCCESSFUL;
+}
+
+
+/* null_read
+ *
+ * This routine is the null device driver read routine.
+ *
+ * Input parameters:
+ * major - device major number
+ * minor - device minor number
+ * pargp - pointer to read parameter block
+ *
+ * Output parameters:
+ * rval - NULL_SUCCESSFUL
+ */
+
+rtems_device_driver null_read(
+ rtems_device_major_number major __attribute__((unused)),
+ rtems_device_minor_number minor __attribute__((unused)),
+ void *pargp __attribute__((unused))
+)
+{
+ return NULL_SUCCESSFUL;
+}
+
+
+/* null_write
+ *
+ * This routine is the null device driver write routine.
+ *
+ * Input parameters:
+ * major - device major number
+ * minor - device minor number
+ * pargp - pointer to write parameter block
+ *
+ * Output parameters:
+ * rval - NULL_SUCCESSFUL
+ */
+
+rtems_device_driver null_write(
+ rtems_device_major_number major __attribute__((unused)),
+ rtems_device_minor_number minor __attribute__((unused)),
+ void *pargp
+)
+{
+ rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *) pargp;
+
+ if ( rw_args )
+ rw_args->bytes_moved = rw_args->count;
+
+ return NULL_SUCCESSFUL;
+}
+
+
+/* null_control
+ *
+ * This routine is the null device driver control routine.
+ *
+ * Input parameters:
+ * major - device major number
+ * minor - device minor number
+ * pargp - pointer to cntrl parameter block
+ *
+ * Output parameters:
+ * rval - NULL_SUCCESSFUL
+ */
+
+rtems_device_driver null_control(
+ rtems_device_major_number major __attribute__((unused)),
+ rtems_device_minor_number minor __attribute__((unused)),
+ void *pargp __attribute__((unused))
+)
+{
+ return NULL_SUCCESSFUL;
+}