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tt_message_context_xval(3)


CDE


NAME

  tt_message_context_xval - retrieve and deserialize the data from a
  message's context


SYNOPSIS

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


DESCRIPTION

  The tt_message_context_xval function retrieves and deserializes the data
  from a message's context.

  The m argument is the opaque handle for the message involved in this
  operation. The slotname argument describes the context of this message. The
  xdr_proc argument points to the XDR procedure to be used to deserialize the
  data in the nth argument into newly allocated storage, the address of which
  will be stored in the pointer whose address is value.

  The value argument is the data to be deserialized.


RETURN VALUE

  Upon successful completion, the tt_message_context_xval 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.


APPLICATION USAGE

  The allocation calls are made by the XDR procedure; therefore, any storage
  allocated is not allocated from the ToolTalk allocation stack. The
  application should use the xdr_free(3) call to free this storage.


SEE ALSO

  Tttt_c(5)

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