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tt_otype_opnum_callback_add(library ctt_otype_opnum_callback_add(library call)

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 auto‐
       matically invoked when a message is delivered because it matched a pat‐
       tern 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 - Tttt_c(5).

       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 callback 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 ser‐
		 vice cannot restart it.

APPLICATION USAGE
       The  tt_otype_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_message_callback_add(3).

				     tt_otype_opnum_callback_add(library call)

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