OpenExtensions for z/VM Overview
z/VM makes it easier for your installation to port
applications, tools, data, and people skills across multiple
systems. This portability can help reduce your overall
cost of computing and enable you to produce high-quality
applications that take advantage of the facilities on other
operating systems.
Port data and applications to and from a wide range of platforms
The implementation of POSIX 1003.1 System Interfaces standard on
VM provides a set of UNIX-based programming interfaces that
enables the porting of applications from UNIX and
other POSIX-compliant platforms to VM. It also allows
POSIX-compliant applications to be developed
on VM and ported to other POSIX-compliant platforms.
UNIX application support was enhanced in VM/ESA V2R3.0
with the addition of more XPG-4 compliant application
programming interfaces and accommodation of certain uses of the
UNIX fork() function.
UNIX application support was enhanced in z/VM 3.1.0
with the addition of the sockets APIs and several file system APIs.
In combination with z/VM preexisting
POSIX API support, application developers and solution providers
have a functionally rich UNIX environment on VM for their
development and porting efforts.
z/VM includes a POSIX 1003.1 compliant file system called the
Byte File System (BFS), which is an extension to the CMS
Shared File System (SFS). The integration of POSIX BFS into the
SFS server structure allows you to store large amounts of data on the
host DASD using SFS. SFS capabilities include data sharing,
backup and restore, and hierarchical storage management through
DFSMS (tm) and ADSM. Through the use of external links, your
POSIX applications can access traditional CMS files without
performing data conversion.
z/VM also supports POSIX 1003.1a, which provides extensions to the
System Interfaces standard. Additional interoperability is provided
with support for sockets, an industry-accepted standard
protocol for client communications TCP/IP sockets (C-language
applications programming interfaces to TCP/IP) correspond closely
to sockets used by UNIX applications, enabling additional
interoperability.
Develop multitasking server applications
With POSIX 1003.1c threading support, your POSIX application
developers have a general set of services, which they can use
to develop multitasking applications that require concurrent
execution streams.
Creating a new process to run a new program
By supporting POSIX 100.2 shell and utilities, z/VM allows
system programmers to have the feel of a UNIX system while
developing or porting their POSIX-based applications.
Having access to a familiar UNIX-like shell and utilities
help enable programmers to reduce their development time.
The VM command and user applications are available from the
shell environment, thus giving you the combined functionality
of VM commands and applications with POSIX utilities and applications.,
IBM OpenExtensions for z/VM: User's Guide (SC24-6108-01)
UNIX is a registered trademark in the United
States, other countries, or both and is
licensed exclusively through X/Open Company Limited.
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