FTAM/9000 Programmer's Guide

Chapter 2 51
Using HP FTAM/9000
Using Functions
Using Functions
FTAM functions may be high level or low level and may be context free or
context sensitive. Refer to the following sections for information on these
function types and for a list of available functions.
High Level Services (HLS) and Low Level
Services (LLS)
FTAM functions are either a high level service (HLS) or a low level
service (LLS). Both HLS and LLS perform the following operations.
• Ensure the input and output data are provided
• Ensure all mandatory parameters have valid values
• Ensure all optionally supplied parameters have valid values
• Provide both synchronous and asynchronous calling modes
Low Level
Service
An LLS is a function that provides the lowest
level of service for the FTAM application
interface.
High Level
Service
An HLS is a function that performs a sequence of
LLS functions, thereby eliminating the need to
make the LLS calls individually. For example, the
HLS ft_fcopy() copies one file to another by
performing all the necessary steps to do so. The
ft_fcopy() function establishes connections with
the source and destination nodes, opens and
closes the file, reads and writes data, and
terminates the regimes.