The I/O manager provides directives which enable the
application program to utilize device drivers in a standard
manner. There is a direct correlation between the RTEMS I/O
manager directives
rtems.io_initialize,
rtems.io_open,
rtems.io_close,
rtems.io_read,
rtems.io_write, and
rtems.io_control
and the underlying device driver entry points.
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