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NAME
     tt_message_arg_mode - return the mode of a message argument

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_mode tt_message_arg_mode(Tt_message m,
                                 int n);

DESCRIPTION
     The tt_message_arg_mode() function returns the mode  of  the
     nth message argument.

     The m argument is the opaque handle for the message involved
     in  this  operation.   The  n  argument is the number of the
     argument to be returned.  The  first  argument  is  numbered
     zero.

RETURN VALUE
     Upon successful completion, the tt_message_arg_mode()  func-
     tion  returns  a  value that specifies who (sender, handler,
     observers) writes and reads a message argument.  The follow-
     ing modes are defined:

        TT_IN   The argument is written by the sender and read by
                the handler and any observers.

        TT_OUT
                The argument is written by the handler  and  read
                by the sender and any reply observers.

        TT_INOUT
                The argument is written by  the  sender  and  the
                handler and read by all.

     The application can use tt_int_error(3) to  extract  one  of
     the  following  Tt_status  values  from  the Tt_mode integer
     return value:

        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_NUM
                The integer value  passed  was  invalid  (out  of
                range).

        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_int_error(3).

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