z/OS® UNIX System
Services provides
capabilities under z/OS to make
it easier to implement or port applications in an open, distributed
environment. z/OS UNIX is available to z/OS XL C/C++ application
programs through the C/C++ language bindings available with the Language Environment® element.
Together, z/OS UNIX, the Language Environment element,
and the z/OS XL C/C++ compilers
provide an application programming interface that supports industry
standards.
z/OS UNIX provides support for both existing
z/OS applications
and new
z/OS UNIX applications through the following
ways:
- C programming language support as defined by ISO C
- C++ programming
language support as defined by ISO C++
- C language bindings as defined in the IEEE 1003.1 and 1003.2 standards;
subsets of the draft 1003.1a and 1003.4a standards; X/Open CAE
Specification: System Interfaces and Headers, Issue 4, Version 2,
which provides standard interfaces for better source code portability
with other conforming systems; and X/Open CAE Specification,
Network Services, Issue 4, which defines the X/Open UNIX descriptions of sockets and
X/Open Transport Interface (XTI)
- z/OS UNIX extensions that provide z/OS-specific
support beyond the defined standards
- The z/OS UNIX Shell and Utilities feature, which
provides:
- A shell, based on the Korn Shell and compatible with the Bourne
Shell
- A shell, tcsh, based on the C shell, csh
- Tools and utilities that support the X/Open Single UNIX Specification, also known
as X/Open Portability Guide (XPG) Version 4, Issue 2, and provide z/OS support. The
following list is a partial list of utilities that are included:
- ar
- Creates and maintains library archives
- as
- Invokes HLASM to create assembler applications
- BPXBATCH
- Allows you to submit batch jobs that run shell commands, scripts,
or z/OS XL C/C++ executable
files in z/OS UNIX files from a shell session
- c89
- Uses host environment variables to compile, assemble, and bind z/OS UNIX,
C/C++ and
assembler applications
- dbx
- Provides an environment to debug and run programs
- gencat
- Merges the message text source files (usually *.msg) into a formatted
message catalog file (usually *.cat)
- iconv
- Converts characters from one code set to another
- ld
- Combines object files and archive files into an output executable
file, resolving external references
- lex
- Automatically writes large parts of a lexical analyzer based on
a description that is supplied by the programmer
- localedef
- Creates a compiled locale object
- make
- Helps you manage projects containing a set of interdependent files,
such as a program with many z/OS source
and object files, keeping all such files up to date with one another
- xlc
- Allows you to invoke the compiler using a customizable configuration
file
- yacc
- Allows you to write compilers and other programs that parse input
according to strict grammar rules
- Support for other utilities such as:
- dspcat
- Displays all or part of a message catalog
- dspmsg
- Displays a selected message from a message catalog
- mkcatdefs
- Preprocesses a message source file for input to the gencat utility
- runcat
- Invokes mkcatdefs and pipes the message catalog source data (the
output from mkcatdefs) to gencat
- Access to the Hierarchical File System (HFS), with support for
the POSIX.1 and XPG4 standards
- Access to the z/OS File
System (zFS), which provides performance improvements over HFS, and
also supports the POSIX.1 and XPG4 standards
- z/OS XL C/C++ I/O
routines, which support using z/OS UNIX files, standard z/OS data
sets, or a mixture of both
- Application threads (with support for a subset of POSIX.4a)
- Support for z/OS XL C/C++ DLLs
z/OS UNIX System
Services offers
program portability across multivendor operating systems, with support
for POSIX.1, POSIX.1a (draft 6), POSIX.2, POSIX.4a (draft 6), and
XPG4.2.
For application developers who have worked with other UNIX environments, the z/OS UNIX Shell
and Utilities is a familiar environment for XL C/C++ application
development. If you are familiar with existing MVS™ development environments, you may find that
the z/OS UNIX System
Services environment
can enhance your productivity. Refer to z/OS UNIX System Services User's Guide for
more information about the Shell and Utilities.