incubator-nuttx/Documentation/components/drivers/character/nullzero.rst

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``dev_null.c`` and ``dev_zero.c``
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These files provide the standard ``/dev/null`` and ``/dev/zero`` devices. See
``include/nuttx/drivers/drivers.h`` for prototypes of functions that should
be called if you want to register these devices (``devnull_register()``
and ``devzero_register()``).