Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!sdd.hp.com!hplabs!hpcc05!hpyhde4!hpycla!hpcuhc!pjw
From: pjw@hpcuhc.cup.hp.com (Pam Williams)
Newsgroups: comp.protocols.ibm
Subject: Passing by Reference in CPI-C
Message-ID: <2110003@hpcuhc.cup.hp.com>
Date: 6 May 91 18:26:47 GMT
Organization: Hewlett Packard, Cupertino
Lines: 47




Can anyone tell me the type for parameters to CPI-C calls in 'C'.  Specifically, 
when passing integer values to a call.


For example, the SAA CPI-C Manual specifies:

Set_Deallocate_Type:

   cmdsdt( conv_id, deallocate_type, return_code)

   conv_id (input)
   deallocate_type(input)
   return_code(output)

And the C Pseudonym File specifies:

   CM_ENTRY cmsdt (unsigned char CM_PTR, CM_INT32 CM_PTR, CM_INT32 CM_PTR)

   where CM_ENTRY is extern void
   and  CM_PTR is *.



I assume my call should then be for example:


   u_char *conv_id;
   int dealloc_type = CM_DEALLOCATE_CONFIRM;
   int rc;

   cmsdt ( conv_id, &dealloc_type, &rc);



Bottom Line:  Is my logic correct in that pointers are required?
              If so, Why was it designed to require passing the address for integer parameters.
              It seems much more obvious to do: cmsdt (conv_id, CM_DEALLOCATE_CONFIRM, &rc);


Thanks for the advice,

Pam Williams
Hewlett-Packard Co
pjw@cup.hp.com