About this document
This document describes the features and usage requirements for the z/OS UNIX System Services (z/OS UNIX) callable services. These services are interfaces between the z/OS® operating system and standard (POSIX or Single UNIX Specification) programming functions that require operating system services. For example, programmers creating runtime library programs use these services. This book also describes callable services that are not related to the standard interfaces.
System programmers coding programs in assembler can use these callable
services to obtain the z/OS UNIX services
they need. This document contains detailed information—such as the
function, requirements, syntax, linkage information, parameters, and
usage information—that is needed to use the services. In the appendixes
you will find information about:
- System control offsets to callable services
- Mapping macros
- Callable service examples
- The relationship of signals to callable services
- Using threads with callable services
- Optimizing performance using process- and thread-level information
- Callable services available to SRB mode routines
- z/OS UNIX process start/end exits
- Accessibility features
- Notices
- An index