Mark Overmeer > POSIX-1003-0.13 > POSIX::1003

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Module Version: 0.13   Source   Latest Release: POSIX-1003-0.98

NAME ^

POSIX::1003 - POSIX 1003.1 extensions to Perl

INHERITANCE ^

 POSIX::1003 is extended by
   POSIX::1003::Confstr
   POSIX::1003::Events
   POSIX::1003::FS
   POSIX::1003::FdIO
   POSIX::1003::Limit
   POSIX::1003::Locale
   POSIX::1003::Math
   POSIX::1003::OS
   POSIX::1003::Pathconf
   POSIX::1003::Proc
   POSIX::1003::Properties
   POSIX::1003::Signals
   POSIX::1003::Sysconf
   POSIX::1003::Termios
   POSIX::1003::Time

SYNOPSIS ^

   # use the specific extensions
   # and see POSIX::Overview and POSIX::3

DESCRIPTION ^

The POSIX module in core (distributed with Perl itself) is ancient, the documentation is usually wrong, and it has too much unusable code in it. POSIX::1003 tries to provide cleaner access to the operating system. More about the choices made can be found in section "Rationale",

The official POSIX standard is large, with over 1200 functions; POSIX::Overview does list them all. This collection of POSIX::1003 extension provides access to quite a number of those functions, when they are not provided by "core". They also define as many system constants as possible. More functions may get added in the future.

Start looking in POSIX::Overview, to discover which module provides certain functionality. You may also guess the location from the module names listed in "DETAILS", below.

Exporter

All modules provide a :constants and a :functions tag, sometimes more. The default is :all, which means: everthing. You may also specify :none (of course: nothing).

When the import list is preceeded by +1, the symbols will get published into the namespace of the caller namespace.

  use POSIX::1003::Pathconf;
  use POSIX::1003::Pathconf ':all';  # same
  use POSIX::3 ':pc';                # same, for the lazy
  use POSIX::3 ':pathconf';          # same, less lazy

  sub MyModule::import(@)   # your own tricky exporter
  {   POSIX::1003::Pathconf->import('+1', @_);
  }

METHODS ^

POSIX::1003->exampleValue(NAME)

Returns an example value for the NAMEd variable. Often, this is a compile-time or runtime constant. For some extensions, like ::Pathconf, that may not be the case.

DETAILS ^

Modules in this distribution

POSIX::1003::Confstr

Provide access to the _CS_* constants.

POSIX::1003::FdIO

Provides unbuffered IO handling; based on file-descriptors.

POSIX::1003::FS

Some generic file-system information. See also POSIX::1003::Pathconf for more precise info.

POSIX::1003::Locale

Locales, see also perllocale.

POSIX::1003::Math

Standard math functions of unknown precission.

POSIX::1003::OS

A few ways to get Operating system information. See also POSIX::1003::Sysconf, POSIX::1003::Confstr, and POSIX::1003::Properties,

POSIX::1003::Pathconf

Provide access to the pathconf() and its trillion _PC_* constants.

POSIX::1003::Properties

Provide access to the _POSIX_* constants.

POSIX::1003::Signals

With helper modules POSIX::SigSet and POSIX::SigAction.

POSIX::1003::Sysconf

Provide access to the sysconf and its zillion _SC_* constants.

POSIX::1003::Termios

Terminal IO

POSIX::1003::Time

Time-stamp processing

POSIX::1003::Limit

For getting and setting resource limits.

Other modules

User::pwent

Provides an OO interface around getpw*()

User::grent

Provides an OO interface around getgr*()

Unix::SavedIDs

provides access to all (get|set)e?[ug]id functions. Of course, you may use the special variables $( $) $< $> as well, but that gives unpredictable results.

Rationale

The POSIX module as distributed with Perl itself is ancient (it dates before Perl5) Although it proclaims that it provides access to all POSIX functions, it only lists about 200 out of 1200. From that subset, half of the functions with croak when you use them, complaining that they cannot get implemented in Perl for some reason.

Many other functions provided by POSIX-in-Core simply forward the caller to a function with the same name which is in basic perl (see perldoc). With a few serious complications: the functions in POSIX do not use prototypes, sometimes expect different arguments and sometimes return different values.

Back to the basics: the POSIX::1003 provides access to the POSIX libraries where they can be made compatible with Perl's way of doing things. For instance, setuid of POSIX is implemented with $), whose exact behavior depends on compile-flags and OS: it's not the pure setuid() of the standard hence left-out. There is no isalpha() either: not compatible with Perl strings and implemented very different interface from POSIX. And there is also no own exit(), because we have a CORE::exit() with the same functionality.

POSIX::1003 compared to POSIX

This distribution does not add much functionality itself: it is mainly core's POSIX.xs (which is always available and ported to all platforms). You can access these routines via POSIX as well.

When you are used to POSIX.pm but want to move to POSIX::1003, you must be aware about the following differences:

SEE ALSO ^

This module is part of POSIX-1003 distribution version 0.13, built on July 26, 2012. Website: http://perl.overmeer.net. The code is based on POSIX, which is released with Perl itself. See also POSIX::Util for additional functionality.

COPYRIGHTS ^

Copyrights of the perl code and the related documentation by 2011-2012 by [Mark Overmeer]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html

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