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NAME
     tt_message_barg_add - add an argument to a pattern

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_message_barg_add(Tt_message m,
                                   Tt_mode n,
                                   const char *vtype,
                                   const unsigned char *value,
                                   int len);

DESCRIPTION
     The tt_message_barg_add() function adds  an  argument  to  a
     pattern  that  may  have  a  byte-array  value that contains
     embedded nulls.

     To change existing argument values, the application must use
     only modes TT_OUT or TT_INOUT.

     Adding arguments when replying to a message  produces  unde-
     fined results.

     The m argument is the opaque handle for the message involved
     in  this  operation.   The n argument 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 vtype argument describes the type of argument data being
     added.

     The ToolTalk service treats the  value  as  an  opaque  byte
     string.   To  pass  structured data, the application and the
     receiving application must encode and  decode  these  opaque
     byte strings.  The most common method to do this is XDR.

     The value argument is the value to be added.  The len  argu-
     ment is the length of the value in bytes.

RETURN VALUE
     Upon successful completion, the tt_message_barg_add()  func-
     tion  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_message_arg_bval_set(3), tt_message_arg_add(3),
     tt_message_iarg_add(3).

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