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       XPAMacros - Server Callback Macros


         #include <xpa.h>

         xpa_class, xpa_name, xpa_method, xpa_cmdfd, xpa_datafd,
         xpa_sendian, xpa_cendian


       Server routines have  access to information about the XPA being called
       via the following macros (each of which takes the xpa handle as an

         macro                 explanation
         ------                -----------
         xpa_class             class of this xpa
         xpa_name              name of this xpa
         xpa_method            method string (inet or local connect info)
         xpa_cmdfd             fd of command socket
         xpa_datafd            fd of data socket
         xpa_sendian           endian\-ness of server ("little" or "big")
         xpa_cendian           endian\-ness of client ("little" or "big"

       The argument to these macros is the call_data pointer that is passed to
       the server procedure.  This pointer should be type case to XPA in the
       server routine:

         XPA xpa = (XPA)call_data;

       The most important of these macros is xpa_datafd().  A server routine
       that sets "fillbuf=false" in receive_mode or send_mode can use this
       macro to perform I/O directly to/from the client, rather than using

       The xpa_cendian and xpa_sendian macros can be used together to
       determine if the data transferred from the client is byte swapped with
       respect to the server. Values for these macros are: "little", "big", or
       "?".  In order to do a proper conversion, you still need to know the
       format of the data (i.e., byte swapping is dependent on the size of the
       data element being converted).


       See xpa(7) for a list of XPA help pages

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