tt_message_arg_mode(3)

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() function returns a
     value that specifies who (sender, handler, observers) writes and reads a
     message argument.  The following 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
     Tttt_c(5), tt_int_error(3).