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NAME
     tt_otype_opnum_callback_add  -  return  a  callback  if  two
     opnums are equal

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

DESCRIPTION
     The tt_otype_opnum_callback_add() function adds  a  callback
     that  is  automatically  invoked when a message is delivered
     because it matched a pattern derived from a signature in the
     named  otype  with an opnum equal to the specified one.  The
     callback is defined in <Tt/tt_c.h>.

     The otid argument is  the  identifier  of  the  object  type
     involved in this operation.  The opnum argument is the opnum
     of the specified otype.  The f argument is the message call-
     back to be run.

RETURN VALUE
     Upon          successful           completion,           the
     tt_otype_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_OTYPE
                The specified object type is not the name  of  an
                installed object 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_otype_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), tt_message_callback_add(3).

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