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Diffstat (limited to 'cpukit/libmisc/devnull/devnull.c')
-rw-r--r-- | cpukit/libmisc/devnull/devnull.c | 184 |
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; +} |