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NAME
     tt_ptype_opnum_callback_add  -  return  a  callback  if  two
     opnums are equal

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_ptype_opnum_callback_add(const char *ptid,
                                           int opnum,
                                           Tt_message_callback f);

DESCRIPTION
     The tt_ptype_opnum_callback_add() function returns  a  call-
     back  if  the  specified  opnums are equal.  The callback is
     defined in <Tt/tt_c.h>.

     When a message is delivered because  it  matched  a  pattern
     derived  from  a  signature in the named ptype with an opnum
     equal to the specified one, the given callback is run in the
     usual ToolTalk way.

     The ptid argument is the identifier of the ptype involved in
     this  operation.   The  opnum  argument  is the opnum of the
     specified ptype.  The f argument is the message callback  to
     be run.

RETURN VALUE
     Upon          successful           completion,           the
     tt_ptype_opnum_callback_add() function returns the status of
     the operation as one of the following Tt_status values:

        TT_OK   The operation completed successfully.

        TT_ERR_PTYPE
                The specified process type is not the name of  an
                installed process type.

        TT_ERR_POINTER
                The pointer passed does not point to an object of
                the correct type for this operation.

        TT_ERR_NOMP
                The ttsession(1) process is not running  and  the
                ToolTalk service cannot restart it.

APPLICATION USAGE
     The  tt_ptype_opnum_callback_add()  function  will  only  be
     called  for messages delivered by virtue of matching handler
     signatures.  The callback cannot be called for observer sig-
     natures  because  the  observer ptype is not recorded in the
     incoming message.


SEE ALSO
     tt_c(5).

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