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NAME
     tt_message_arg_xval_set - serialize and  set  data  into  an
     existing message argument

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_message_arg_xval_set(Tt_message m,
                                       int n,
                                       xdrproc_t xdr_proc,
                                       void *value);

DESCRIPTION
     The tt_message_arg_xval_set() function serializes  and  sets
     data into an existing 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 changed.   The  first  argument  is  numbered
     zero.         The       xdr_proc       argument       causes
     tt_message_arg_xval_set() to serialize the data  pointed  to
     by  value  and  store  it  as a byte string value of the nth
     argument of the message.  The value argument is the data  to
     be serialized.

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

        TT_OK   The operation completed successfully.

        TT_ERR_MODE
                The specified Tt_mode is invalid.

        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.

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

        TT_ERR_XDR
                The XDR procedure failed on the  given  data,  or
                evaluated to a zero-length expression.

SEE ALSO
     tt_c(5).

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