NAME

tt_message_arg_mode − return the mode of a message argument

SYNOPSIS

#include <Tt/tt_c.h>
Tt_mode tt_message_arg_mode(Tt_message m,
int n);

DESCRIPTION

The tt_message_arg_mode() function returns the mode of the nth 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 returned.  The first argument is numbered zero. 

RETURN VALUE

Upon successful completion, the tt_message_arg_mode() function returns a value that 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 application can use tt_int_error(3) to extract one of the following Tt_status values from the Tt_mode integer return value:

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

TT_ERR_POINTER
The pointer passed does not point to an object of the correct type for this operation.

SEE ALSO

Tttt_c(5), tt_int_error(3). 

  —  11 May 1994