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tt_ptype_opnum_callback_add(library ctt_ptype_opnum_callback_add(library call)

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  callback if the
       specified opnums are equal.  The callback is  defined  in  Tt/tt_c.h  -
       Tttt_c(5).

       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 oper‐
       ation.  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 ser‐
		 vice cannot restart it.

APPLICATION USAGE
       The tt_ptype_opnum_callback_add function will only be called  for  mes‐
       sages delivered by virtue of matching handler signatures.  The callback
       cannot be called for observer signatures because the observer ptype  is
       not recorded in the incoming message.

SEE ALSO
       Tt/tt_c.h - Tttt_c(5).

				     tt_ptype_opnum_callback_add(library call)

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