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NAME
     tt_pattern_callback_add - register a message-matching  call-
     back function

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_pattern_callback_add(Tt_pattern m,
                                       Tt_message_callback f);

DESCRIPTION
     The tt_pattern_callback_add() function registers a  callback
     function    that    will   be   automatically   invoked   by
     tt_message_receive(3) whenever a message  matches  the  pat-
     tern.

     The callback is defined in  <Tt/tt_c.h>.   If  the  callback
     returns  TT_CALLBACK_CONTINUE,  other callbacks will be run;
     if    no     callback     returns     TT_CALLBACK_PROCESSED,
     tt_message_receive(3)  returns the message.  If the callback
     returns TT_CALLBACK_PROCESSED, no further callbacks will  be
     invoked  for  this  event;  tt_message_receive(3)  does  not
     return the message.

     The m argument is the opaque handle for the pattern involved
     in this operation.

     The f argument is the message callback to be run.

     The  application  should  check  the  tt_message_uid(3)  and
     tt_message_gid(3)  against  the  User ID and Group ID of the
     application receiving the messsage. If the UID and/or GID of
     the  application  do  not match that of the message then the
     receiving application should consider  failing  the  message
     with TT_DESKTOP_EACCES.

RETURN VALUE
     Upon successful  completion,  the  tt_pattern_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_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_register(3), tt_message_receive(3).

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