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+PR_PopIOLayer
+=============
+
+Removes a layer from the stack.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRFileDesc *PR_PopIOLayer(
+     PRFileDesc *stack,
+     PRDescIdentity id);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``stack``
+   A pointer to a :ref:`PRFileDesc` object representing the stack from
+   which the specified layer is to be removed.
+``id``
+   Identity of the layer to be removed from the stack.
+
+
+Returns
+~~~~~~~
+
+The function returns one of the following values:
+
+-  If the layer is successfully removed from the stack, a pointer to the
+   removed layer.
+-  If the layer is not found in the stack or cannot be popped (for
+   example, the bottommost layer), the function returns ``NULL`` with
+   the error code ``PR_INVALID_ARGUMENT_ERROR``.
+
+
+Description
+-----------
+
+:ref:`PR_PopIOLayer` pops the specified layer from the stack. If the object
+to be removed is found, :ref:`PR_PopIOLayer` returns a pointer to the
+removed object The object then becomes the responsibility of the caller.
+
+Even if the identity indicates the top layer of the stack, the reference
+returned is not the file descriptor for the stack and that file
+descriptor remains valid. In other words, ``stack`` continues to point
+to the top of the stack after the function returns.