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NAME
     tt_message_xcontext_set - set the XDR-interpreted byte-array
     value of a message's context

SYNOPSIS
     #include <Tt/tt_c.h>
     Tt_status tt_message_xcontext_set(Tt_message m,
                                       const char *slotname,
                                       xdrproc_t xdr_proc,
                                       void *value);

DESCRIPTION
     The  tt_message_xcontext_set()  function   sets   the   XDR-
     interpreted byte-array value of a message's context.

     The m argument is the opaque handle for the message involved
     in  this  operation.   The  slotname  argument describes the
     slotname in this message.  The value argument  is  the  byte
     string  with  the  contents  for  the message argument.  The
     xdr_proc argument points to the XDR procedure to be used  to
     serialize  the data pointed to by value.  The value argument
     is the data to be serialized.

RETURN VALUE
     Upon successful  completion,  the  tt_message_xcontext_set()
     function  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 does not point at an  object  of  the
                correct type for this operation.

        TT_ERR_SLOTNAME
                The specified slotname is syntactically invalid.

        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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