VeriFone DUET Vx810, Справочное руководство

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F
ILE
A
UTHENTICATION
File Authentication and the File System
82
V X 810 R
EFERENCE
G
UIDE
This system of partitions and sub-partitions makes it possible to store multiple
applications into a device’s memory and prevent these applications from
overlapping or interfering with each other’s operation.
There are a total of 16 file groups. Group 0 is the name of the 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 31 V
x
810 Application Memory Partitions
Rules for Storing Applications in Specific File Groups
Here are some important V
x
810 file system features, as they relate to storing
application files in specific file groups, and how these features affect the file
authentication process:
•
Most applications consist of more than one executable. For each executable
to run on the device, 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 device 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.
•
The main application stored in GID1 can access files, secondary applications,
or function libraries stored in any other file group.
•
The application downloaded onto GID1 is always the primary application for
the device. This application is owned by the primary device sponsor (sponsor
A) in cases where there are multiple sponsors.
•
The Group 1 application controls any and all secondary applications stored in
device’s memory. That is, a secondary application can only be invoked by a
RUN command issued by the Group 1 application.
NOTE
The V
x
810 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.