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NAME
     tt_pattern_class_add - add a value to the class  information
     for a pattern

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_pattern_class_add(Tt_pattern p,
                                    Tt_class c);

DESCRIPTION
     The tt_pattern_class_add() function  adds  a  value  to  the
     class information for the specified pattern.

     If the class is TT_REQUEST, the sending  process  expects  a
     reply to the message.

     If the class is TT_NOTICE,  the  sending  process  does  not
     expect a reply to the message.

     The p argument is a unique handle  for  a  message  pattern.
     This   handle  is  returned  after  tt_pattern_create(3)  is
     called.  The c argument indicates whether the receiving pro-
     cess  is  to take action after the message is received.  The
     following values are defined:

        TT_NOTICE
                A notice of an event.  The sender does  not  want
                feedback on this message.

        TT_REQUEST
                A request for  some  action  to  be  taken.   The
                sender  must  be notified of progress, success or
                failure, and must receive any return values.

RETURN VALUE
     Upon successful completion, the tt_pattern_class_add() func-
     tion  returns the status of the operation as one of the fol-
     lowing Tt_status values:

        TT_OK   The operation completed successfully.

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

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

SEE ALSO
     tt_c(5), tt_pattern_create(3).

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