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NAME
     tt_file_join - register interest  in  messages  involving  a
     file

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_file_join(const char *filepath);

DESCRIPTION
     The tt_file_join() function  informs  the  ToolTalk  service
     that  the process is interested in messages that involve the
     specified file.

     The ToolTalk service adds this file value to  any  currently
     registered  patterns.   The  named  file becomes the default
     file.

     When the process joins a file, the ToolTalk service  updates
     the   file   field   of   its   registered   patterns.   The
     tt_file_join() call causes the pattern's ToolTalk session to
     be stored in the database.

     The filepath argument is a pointer to the  pathname  of  the
     file in which the process is interested.

RETURN VALUE
     Upon  successful  completion,  the  tt_file_join()  function
     returns  the status of the operation as one of the following
     Tt_status values:

        TT_OK   The operation completed successfully.

        TT_ERR_DBAVAIL
                The ToolTalk service could not access  the  Tool-
                Talk database needed for this operation.

        TT_ERR_DBEXIST
                The ToolTalk service could not access the  speci-
                fied ToolTalk database in the expected place.

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

        TT_ERR_PATH
                The specified pathname included  an  unsearchable
                directory.

SEE ALSO
     tt_c(5).

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