Note: This topic applies to C applications only.
As a C routine executes, facilities from the Language Environment common
library are invoked to set up the execution environment in order to
handle termination activities and provide storage management, error
handling, runtime options parsing, ILC, and debugging support. In
addition, the C library functions are in the Language Environment common
library.
For situations in which not all of these services are needed, the
system programming facilities of C can provide a limited environment.
System programming facilities allow you to run applications without
using the
Language Environment common
library, or with just the C library functions, and to:
- Develop
C applications that do not require the Language Environment common
library on the machines on which they run.
- Use C as an assembler language substitute to,
for example, write exit routines for MVS™,
TSO, or JES.
- Develop applications featuring:
- A persistent C environment, in which a C environment is created
once and used repeatedly for C function execution from any language.
- Co-routines that use a two-stack model, as in client-server style
applications. In this style, the user application calls on the applications
server to perform services independently of the user and then return
to the user.
For more information on the system programming facilities of C,
see z/OS XL C/C++ Programming Guide.
This topic discusses how to build these applications once you have
compiled them with the C compiler. You must compile these programs
with the NOSTART option.