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NAME
     tt_pattern_barg_add - add an argument with a value that con-
     tains embedded nulls to a pattern

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

DESCRIPTION
     The tt_pattern_barg_add() function adds an argument  with  a
     value that contains embedded nulls to a pattern.

     The m argument is the opaque handle for the pattern 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.  Type ALL matches any argument value type.

     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  unique
     values.  The most common method to use is XDR.

     The value argument is the value to be added.   NULL  matches
     any value.

     The len argument is the length of the value in bytes.

     Pattern arguments are positional paramaters, and  thus  will
     only  match  an  incoming  message if the arguments have the
     same type and position  within  the  argument  list  of  the
     incoming message. In order to match an argument which is not
     the first in a list of arguments, the  programmer  must  use
     tt_pattern_arg_add(3) to register wildcard arguments for the
     intervening arguments between the  first  argument  and  the
     argument which it is desired to match on. Wildcard arguments
     should have the vtype of "ALL" and a value of NULL.

RETURN VALUE
     Upon successful completion, the tt_pattern_barg_add()  func-
     tion  returns the status of the operation as one of the fol-
     lowing 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_pattern_arg_add(3),
     tt_pattern_iarg_add(3).

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