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Updated: Thursday, June 13, 2019
 
 

tt_otype_opnum_callback_add (3)

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

ToolTalk Functions                              tt_otype_opnum_callback_add(3)



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 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 cor-
                  rect 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 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.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       +---------------+------------------+
       |ATTRIBUTE TYPE | ATTRIBUTE VALUE  |
       +---------------+------------------+
       |Availability   | library/tooltalk |
       +---------------+------------------+
       |Stability      | Committed        |
       +---------------+------------------+
SEE ALSO
       tt_c(5), tt_message_callback_add(3).




ToolTalk 1.3                     1 March 1996
                                                tt_otype_opnum_callback_add(3)