ISO/IEC 23360-1-1:2021

INTERNATIONAL ISO/IEC
STANDARD 23360-1-1
First edition
2021-10
Linux Standard Base (LSB) —
Part 1-1:
Common definitions
Reference number
©
ISO/IEC 2021
© ISO/IEC 2021
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ii © ISO/IEC 2021 – All rights reserved

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
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The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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see www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by the Linux Foundation as Linux Standard Base (LSB): Common
Definitions and drafted in accordance with its editorial rules. It was assigned to Joint Technical
Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 22, Programming languages, their
environments and system software interfaces, and adopted by National Bodies.
This first edition of ISO/IEC 23360-1-1 cancels and replaces ISO/IEC 23360-1:2006, which has been
technically revised.
This document is based on “The GNU Free Documentation License, version 1.1”. The license is available
at https://www.gnu.org/licenses/old-licenses/fdl-1.1.html.
A list of all parts in the ISO/IEC 23660 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-
committees.
© ISO/IEC 2021 – All rights reserved iii

Contents
Foreword . iii
Introduction . .v
1 Scope . 1
2 Requirements . 2
2.1 Relevant Libraries . 2
2.2 Relevant Commands . 4
2.3 LSB Implementation Conformance. 5
2.4 LSB Application Conformance . 6
3 Terms and Definitions . 8
4 Documentation Conventions . 10
5 Relationship To ISO/IEC 9945 POSIX . 11
6 Relationship To Other Linux Foundation Specifications . 12
iv © 2021 ISO/IEC – All rights reserved

Introduction
The LSB defines a binary interface for application programs that are compiled
and packaged for LSB-conforming implementations on many different hardware
architectures. A binary specification must include information specific to the
computer processor architecture for which it is intended. To avoid the complexity
of conditional descriptions, the specification has instead been divided into
generic parts which are augmented by one of several architecture-specific parts,
depending on the target processor architecture; the generic part will indicate
when reference must be made to the architecture part, and vice versa.
This document should be used in conjunction with the documents it references.
This document enumerates the system components it includes, but descriptions
of those components may be included entirely or partly in this document, partly
in other documents, or entirely in other reference documents. For example, the
section that describes system service routines includes a list of the system
routines supported in this interface, formal declarations of the data structures
they use that are visible to applications, and a pointer to the underlying
referenced specification for information about the syntax and semantics of each
call. Only those routines not described in standards referenced by this document,
or extensions to those standards, are described in the detail. Information
referenced in this way is as much a part of this document as is the information
explicitly included here.
The specification carries a version number of either the form x.y or x.y.z. This
version number carries the following meaning:
1. The first number (x) is the major version number. Versions sharing the same
major version number shall be compatible in a backwards direction; that is,
a newer version shall be compatible with an older version. Any deletion of
a library results in a new major version number. Interfaces marked as
deprecated may be removed from the specification at a major version
change.
2. The second number (y) is the minor version number. Libraries and
individual interfaces may be added, but not removed. Interfaces may be
marked as deprecated at a minor version change. Other minor changes may
be permitted at the discretion of the LSB workgroup.
3. The third number (z), if present, is the editorial level. Only editorial changes
should be included in such versions.
Since this specification is a descriptive Application Binary Interface, and not a
source level API specification, it is not possible to make a guarantee of 100%
backward compatibility between major releases. However, it is the intent that
those parts of the binary interface that are visible in the source level API will
remain backward compatible from version to version, except where a feature
marked as "Deprecated" in one release may be removed from a future release.
Implementors are strongly encouraged to make use of symbol versioning to
permit simultaneous support of applications conforming to different releases of
this specification.
LSB is a trademark of the Linux Foundation. Developers of applications or
implementations interested in using the trademark should see the Linux
Foundation Certification Policy for details.
v
© 2021 ISO/IEC – All rights reserved

1 Scope
The Linux Standard Base (LSB) defines a system interface for compiled
applications and a minimal environment for support of installation scripts. Its
purpose is to enable a uniform industry standard environment for high-volume
applications conforming to the LSB.
The LSB specification set is divided into modules, each of which provides
fundamental system interfaces, libraries, and runtime environment upon which
all conforming applications and libraries using that module depend.
The modules of the Linux Standard Base are:
• LSB Core - core components
• LSB Desktop - desktop related components
• LSB Languages - runtime languages
• LSB Imaging - printing and scanning
• LSB Trial Use - components that are not yet mandatory
Interfaces described in the LSB Core module specification are supplemented by
other LSB module specifications. All other modules depend on the presence of
LSB Core.
These specifications are composed of two basic parts: a common part describing
those parts of the interface that remain constant across all implementations of the
LSB, and an architecture-specific part describing the parts of the interface that
vary by processor architecture. Together, the common part and the relevant
architecture-specific part for a single hardware architecture provide a complete
interface specification for compiled application programs on systems that share
a common hardware architecture. Whenever a section of the common part is
supplemented by architecture-specific information, the common part includes a
reference to the architecture-specific part. Architecture-specific parts of of an LSB
module specification may also contain additional information that is not
referenced in the common part.
The LSB contains both a set of Application Program Interfaces (APIs) and
Application Binary Interfaces (ABIs). APIs may appear in the source code of
portable applications, while the compiled binary of that application may use the
larger set of ABIs. A conforming implementation provides all of the ABIs listed
here. The compilation system may replace (e.g. by macro definition) certain APIs
with calls to one or more of the underlying binary interfaces, and may insert calls
to binary interfaces as needed.
The LSB is primarily a binary interface definition. Not all of the source level APIs
available to applications may be contained in this specification.
© 2021 ISO/IEC – All rights reserved 1

2 Requirements
2.1 Relevant Libraries
The libraries listed in the following tables shall be available on a Linux Standard
Base system, with the specified runtime names. The libraries listed in Table 2-2
are architecture specific, but shall be available on all LSB conforming systems
under a name specified in each Architecture Specific Part of the LSB Core module.
Table 2-1 LSB Core Module Library Names
Library Runtime Name
libcrypt libcrypt.so.1
libdl libdl.so.2
libgcc_s libgcc_s.so.1
libncurses libncurses.so.5
libncursesw libncursesw.so.5
libnspr4 libnspr4.so
libnss3 libnss3.so
libpam libpam.so.0
libpthread libpthread.so.0
librt librt.so.1
libssl3 libssl3.so
libstdcxx libstdc++.so.6
libutil libutil.so.1
libz libz.so.1
Table 2-2 LSB Core Module Library Names which vary by architecture
Library Runtime Name
libc See architecture specific part.
libm See architecture specific part.
proginterp See architecture specific part.

Table 2-3 LSB Desktop Module Library Names
Library Runtime Name
libGL libGL.so.1
libGLU libGLU.so.1
libICE libICE.so.6
libQtCore libQtCore.so.4
libQtGui libQtGui.so.4
2 © 2021 ISO/IEC – All rights reserved

Library Runtime Name
libQtNetwork libQtNetwork.so.4
libQtOpenGL libQtOpenGL.so.4
libQtSql libQtSql.so.4
libQtSvg libQtSvg.so.4
libQtXml libQtXml.so.4
libSM libSM.so.6
libX11 libX11.so.6
libXext libXext.so.6
libXft libXft.so.2
libXi libXi.so.6
libXrender libXrender.so.1
libXt libXt.so.6
libXtst libXtst.so.6
libasound libasound.so.2
libatk-1.0 libatk-1.0.so.0
libcairo libcairo.so.2
libcairo-gobject libcairo-gobject.so.2
libcairo-script-interpreter libcairo-script-interpreter.so.2
libfontconfig libfontconfig.so.1
libfreetype libfreetype.so.6
libgdk-x11-2.0 libgdk-x11-2.0.so.0
libgdk_pixbuf-2.0 libgdk_pixbuf-2.0.so.0
libgdk_pixbuf_xlib-2.0 libgdk_pixbuf_xlib-2.0.so.0
libgio-2.0 libgio-2.0.so.0
libglib-2.0 libglib-2.0.so.0
libgmodule-2.0 libgmodule-2.0.so.0
libgobject-2.0 libgobject-2.0.so.0
libgthread-2.0 libgthread-2.0.so.0
libgtk-x11-2.0 libgtk-x11-2.0.so.0
libjpeg libjpeg.so.62
libpango-1.0 libpango-1.0.so.0
libpangocairo-1.0 libpangocairo-1.0.so.0
libpangoft2-1.0 libpangoft2-1.0.so.0
© 2021 ISO/IEC – All rights reserved 3

Library Runtime Name
libpangoxft-1.0 libpangoxft-1.0.so.0
libpng12 libpng12.so.0
libtiff libtiff.so.5
libxcb libxcb.so.1
Table 2-4 LSB Imaging Module Library
...