ISO/IEC/IEEE 9945:2009 PDF
Information technology — Portable Operating System Interface (POSIX®) Base Specifications, Issue 7
Information technology — Portable Operating System Interface (POSIX®) Base Specifications, Issue 7
- Статус документа:
- Отменён
- Формат:
- Электронный (PDF)
- Количество страниц:
- 3807
- Дата публикации:
- 15 сентября 2009 г.
- Издание:
- ISO/IEC/IEEE IS 9945 edition 1 version 1
- ICS:
- 35.060
ISO/IEC/IEEE 9945:2009 defines a standard operating system interface and environment, including a command interpreter (or "shell"), and common utility programs to support applications portability at the source code level. ISO/IEC/IEEE 9945:2009 is intended to be used by both application developers and system implementers and comprises four major components (each in an associated volume). General terms, concepts, and interfaces common to all volumes of this standard, including utility conventions and C-language header definitions, are included in the Base Definitions volume. Definitions for system service functions and subroutines, language-specific system services for the C programming language, function issues, including portability, error handling, and error recovery, are included in the System Interfaces volume. Definitions for a standard source code-level interface to command interpretation services (a "shell") and common utility programs for application programs are included in the Shell and Utilities volume. Extended rationale that did not fit well into the rest of the document structure, which contains historical information concerning the contents of ISO/IEC/IEEE 9945:2009 and why features were included or discarded by the ISO/IEC/IEEE 9945:2009 developers, is included in the Rationale (Informative) volume. The following areas are outside the scope of ISO/IEC/IEEE 9945:2009: graphics interfaces; database management system interfaces; record I/O considerations; object or binary code portability; system configuration and resource availability. ISO/IEC/IEEE 9945:2009 describes the external characteristics and facilities that are of importance to application developers, rather than the internal construction techniques employed to achieve these capabilities. Special emphasis is placed on those functions and facilities that are needed in a wide variety of commercial applications.
Abstract
Overview
ISO/IEC/IEEE 9945:2009 - POSIX® Base Specifications, Issue 7 defines a standardized operating system interface and environment to support source-level portability of applications. Published jointly by ISO, IEC, IEEE and based on work by The Open Group and IEEE, this standard specifies the external characteristics of operating system services, a command interpreter (the “shell”), and common utility programs-focusing on what application developers need rather than internal implementation details.
Key Topics
- Modular structure: four associated volumes covering the Base Definitions, System Interfaces, Shell and Utilities, and a Rationale (informative) volume explaining historical and design choices.
- Base Definitions: general terms, concepts, utility conventions, and C-language header definitions used across the standard.
- System Interfaces: definitions of system service functions and subroutines, including language-specific services for the C programming language, portability considerations, and error handling and recovery behaviors.
- Shell and Utilities: a standard source-level interface to command interpretation services (the shell) and commonly used utility programs that applications can rely on.
- Scope exclusions: explicitly does not cover graphics interfaces, database management interfaces, record I/O details, object/binary code portability, or system configuration/resource availability.
- Design focus: describes external facilities and behaviors important to application developers-emphasizing portability across diverse commercial applications.
Applications
ISO/IEC/IEEE 9945:2009 is practical for:
- Application developers seeking predictable, portable behavior across UNIX-like platforms and POSIX-compliant systems.
- System implementers and OS vendors creating or certifying POSIX-compliant operating systems, shells, and runtime libraries.
- Library and tool authors who must conform to standard C headers and utility conventions.
- Embedded and real-time system integrators that require a defined API surface for portability and predictable error handling.
- Test labs and certification bodies validating compliance and interoperability.
Benefits include reduced porting cost, clearer interface contracts, and improved interoperability across POSIX-compliant environments.
Related Standards
- Published in cooperation with IEEE and The Open Group; built on earlier POSIX work and maintained within international standards frameworks.
- Useful alongside language standards (e.g., C language standards) and platform-specific compliance documents when implementing or testing conformance.
Keywords: ISO/IEC/IEEE 9945:2009, POSIX, POSIX Base Specifications, portability, operating system interface, shell and utilities, C-language headers, application portability.
Технические детали
- Технический комитет
- ISO/IEC JTC 1/SC 22 - Programming languages, their environments and system software interfaces
- SKU
- ISO/IEC/IEEE 9945:2009
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