Description
-----------
-.. note:: This ioctl is undocumented. Documentation is welcome.
+Sends a message via a CI CA module.
+.. note::
+
+ Please notice that, on most drivers, this is done by writing
+ to the /dev/adapter?/ca? device node.
Return Value
------------
-On success 0 is returned, on error -1 and the ``errno`` variable is set
-appropriately. The generic error codes are described at the
+On success 0 is returned.
+
+On error -1 is returned, and the ``errno`` variable is set
+appropriately.
+
+Generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.