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+PR_GetSpecialFD
+===============
+
+Gets the file descriptor that represents the standard input, output, or
+error stream.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRFileDesc* PR_GetSpecialFD(PRSpecialFD id);
+
+
+Parameter
+~~~~~~~~~
+
+The function has the following parameter:
+
+``id``
+   A pointer to an enumerator of type ``PRSpecialFD``, indicating the
+   type of I/O stream desired: ``PR_StandardInput``,
+   ``PR_StandardOutput``, or ``PR_StandardError``.
+
+
+Returns
+~~~~~~~
+
+If the ``id`` parameter is valid, :ref:`PR_GetSpecialFD` returns a file
+descriptor that represents the corresponding standard I/O stream.
+Otherwise, :ref:`PR_GetSpecialFD` returns ``NULL`` and sets the error to
+``PR_INVALID_ARGUMENT_ERROR``.
+
+
+Description
+-----------
+
+Type ``PRSpecialFD`` is defined as follows:
+
+.. code::
+
+   typedef enum PRSpecialFD{
+      PR_StandardInput,
+      PR_StandardOutput,
+      PR_StandardError
+   } PRSpecialFD;
+
+``#define PR_STDIN PR_GetSpecialFD(PR_StandardInput)``
+``#define PR_STDOUT PR_GetSpecialFD(PR_StandardOutput)``
+``#define PR_STDERR PR_GetSpecialFD(PR_StandardError)``
+
+File descriptors returned by :ref:`PR_GetSpecialFD` are owned by the
+runtime and should not be closed by the caller.