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IEEE 1003.5 INT 1 Document Information:
Title
Information Technology - POSIX Ada Language Interfaces - Part 1: Binding for System Application Program Interface (API) - Amendment 2: Protocol-Independent Interfaces
The Institute of Electrical and Electronics Engineers, Inc.
Publication Date:
Dec 1, 2006
Scope:
Foreword
This standard is an amended version of IEEE Std 1003.5b-1996. The basic goal of this standard is to provide an Ada application program interface for the language-independent services made accessible to C-language applications programs by the interfaces defined in ISO/IEC 9945-1:1996 (IEEE Std 1003.1-1996) {2} as amended by IEEE P1003.1g {B14}.
The intent is to support portability of Ada applications via a standard binding to the services provided by a POSIX-conforming operating system. POSIX is defined by the standard C-language interfaces cited above. Therefore, much of the work in producing this standard was deciding what features of those C-language interfaces represented POSIX functionality, as opposed to C-language-specific features.
This standard provides package specifications and accompanying textual description for a set of Ada packages that represent the POSIX system. This standard also specifies behavior to support the binding that must be provided by the Ada compilation system, and further defines behavior specified as implementation defined in the Ada language standard (particularly in the area of Text_IO) for use in a POSIX environment.
The emphasis in POSIX is on application program portability, so the interfaces in this standard are not intended to be sufficient to implement an Ada compilation system or a POSIX shell as defined in IEEE Standard 1003.2 {B16}. For an application, the intent is that a Strictly Conforming POSIX.5 Application (one that uses only the facilities in this standard and that does not depend on implementation-defined behavior) can be ported to any Conforming Implementation of these interfaces and that the binding makes it easy to identify where a program is not strictly conforming and makes such programs easier to port.
Organization of This Standard
The standard is divided into three parts:
— Statement of scope, list of normative references, and conformance information (Section 1)
— Definitions and global concepts (Section 2)
— The various interface facilities (Sections 3 through 19)
The content of the sections parallels that of the correspondingly numbered sections of ISO/IEC 9945-1:1996 and IEEE P1003.1g/D6.6, with a few changes required to accomodate differences between the Ada and C-language interfaces.This standard has no Section 10, since there is no Ada binding for that Section 10 (Data Interchange Formats) of ISO/IEC 9945-1:1996.
Scope
This standard defines a set of system application program interfaces to operating system services. These interfaces provide access via the Ada programming language to the same operating system services for which C-language interfaces are specified in ISO/IEC 9945-1:1996 {2} 1)2) and IEEE P1003.1g {B14}.
The purpose of this standard is to support application portability at the Ada source code level. This standard is intended to be used by both application developers and system implementors.
This standard is intended to be compatible with implementations of the 1995 revision to the Ada language standard (ISO/IEC 8652:1995 {1}). Fall-back approaches compatible with implementations of the original Ada language standard (ISO/IEC 8652:1987 {B5}) are also provided (see 1.3).
This standard is intended to contain no specifications that conflict with “Year 2000” requirements.
This standard comprises three major components:
— Definitions for terminology and concepts, and definitions and specifications that govern program structures, language-system interaction, and related requirements.
— Definitions of the specific Ada interfaces to the system services defined by the POSIX standards, presented in the form of Ada packages.
— Interpretations of Ada semantics with respect to the POSIX standards.
The following areas are outside the scope of this standard:
(1) User interface (shell) and commands associated with Ada program development.
(2) Ada bindings to the archive/interchange file formats for tar and cpio.
(3) Network protocols.
(4) Graphics and windowing interfaces.
(5) Database management system interfaces.
(6) Object or binary code portability.
(7) System configuration and resource availability.
(8) Interfaces to the Ada runtime system.
When the XTI Detailed Network Interface option and/or the Sockets Detailed Network Interface option are supported, then a set of DNI’s (see 2.2.3.26) are also within the scope of this standard. A DNI is intended to provide access to protocol-specific features of the underlying network for highly portable applications that need access to sophisticated network features. The DNI’s are based on the SPG4 XTI and 4.4 BSD socket specifications.
The following areas are outside of the scope of the DNI’s:
— Interface to manipulate underlying protocol implementations
— Network management interface
— Interface to manipulate performance-specific features
— Definition for protocol address formats
This standard describes the external characteristics and facilities that are of importance to applications developers, rather than the implementation approaches that may be employed to achieve them. Special emphasis is placed on those facilities and capabilities needed for the broad spectrum of applications.
This standard has been defined exclusively at the source code level. The objective is that a Strictly Conforming POSIX.5 Application can be compiled to execute on any conforming implementation, within the portability of the application Ada code itself.
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