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| -rw-r--r-- | docs/nspr/reference/pr_popiolayer.rst | 53 |
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diff --git a/docs/nspr/reference/pr_popiolayer.rst b/docs/nspr/reference/pr_popiolayer.rst new file mode 100644 index 0000000000..42fae4c074 --- /dev/null +++ b/docs/nspr/reference/pr_popiolayer.rst @@ -0,0 +1,53 @@ +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. |