The Single UNIX Specification version 3 is the same as POSIX.1:2001.
This standard has been jointly developed by the IEEE and The Open Group.
It is both an IEEE Standard and an Open Group Technical Standard.
Abstract: This standard 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. This standard is the single common revision to IEEE
Std 1003.1-1996, IEEE Std 1003.2-1992, and the Base Specifications of
The Open Group Single UNIX Specification, Version 2. This standard is
intended to be used by both applications developers and system
implementors. It comprises four major components (each in an associated
volume):
1. 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 (XBD).
2. 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 (XSH).
3. 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
(XCU).
4. Extended rationale that did not fit well into the rest of the
document structure, containing historical information concerning the
contents of this standard and why features were included or discarded by
the standard developers, is included in the Rationale (Informative)
volume (XRAT).
On Thu, 2003-03-13 at 12:36, Graham Greene wrote:
> Can "The Single UNIX Specification, Version 3" be used as a reference
> for functions that are defined by POSIX? The reason I ask is because
> this site:
> http://standards.ieee.org/catalog/olis/posix.html
> shows 4 volumes for 1003.1-2001, where volume 1 is "System Interface
> (POSIX)" and for volume 2 is says "This standard is equivalent to the
> Single UNIX Specification". Whats the difference? (I don't have a grand
> to download them and find out.)
>
> Also, if I wanted to write a POSIX compliant application, would it be
> more likely to run a more systems today if stuck to POSIX.1 or POSIX.2?
> (Again, the only thing I have access to "The Single UNIX Specification,
> Version 3" on www.unix.org.
>
> Graham Greene
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