File Authentication And The File System - VeriFone VX 680 Reference Manual

File Application Memory Logically Divided Into File Groups
Authentication
The memory of a VX 680 terminal is logically divided into two main areas, or
and the File
partitions:
System
•
•
The application partition is further divided into sub-partitions. These sub-partitions
are called file groups or GIDs.
This system of partitions and sub-partitions makes it possible to store multiple
applications in terminal memory and prevent these applications from overlapping
or otherwise interfering with each other's operation.
There are a total of 16 file groups
operating system partition. Group 1 is reserved for the main application.
Groups 2–14 are available for related executable files or secondary applications.
Group 15 is open, and used for shared files such as shared libraries.
Figure 10
NOTE
Rules for Storing Applications in Specific File Groups
Here are some important VX 680 file system features, as they relate to storing
application files in specific file groups, and how these features affect the file
authentication process:
•
•
•
operating system
applications
VX 680 Application Memory Partitions
The VX 680 operating system only enforces the rule that the main application be
always stored in GID1. You can, for example, store a shared library in any file
group. Rules for Storing Applications in Specific File Groups
follow the guidelines previously described for storing applications and libraries in
specific file groups.
Most applications consist of more than one executable. For each executable
to run on the terminal, it must be signed and authenticated.
Although not enforced by the operating system, it is recommended that only
one application be stored per file group in the application partition. Any
number of executable files can, however, be stored in a single file group.
Using the CONFIG.SYS *GO variable, you can specify only one application to
automatically execute following a download and terminal restart. The defined
application is usually the main application stored in Group 1 and called from
the *GO variable in the CONFIG.SYS file in GID1.

File Authentication and the File System

(Figure 10). Group 0 is the name of the
F A
ILE UTHENTICATION
states reasons to
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EFERENCE UIDE
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