NAME

POSIX::1003::Sysconf - POSIX access to sysconf()

SYNOPSIS

use POSIX::1003::Sysconf; # load all names

use POSIX::1003::Sysconf qw(sysconf);
# keys are strings!
$ticks = sysconf('_SC_CLK_TCK');

use POSIX::1003::Sysconf qw(sysconf _SC_CLK_TCK);
$ticks  = _SC_CLK_TCK;   # constants are subs

use POSIX::1003::Sysconf '%sysconf';
my $key = $sysconf{_SC_CLK_TCK};
$sysconf{_SC_NEW_KEY} = $key_code;
$ticks  = sysconf($key);

print "$_\n" for keys %sysconf;

DESCRIPTION

The sysconf() interface can be used to query system information in numerical form, where confstr() returns strings.

METHODS

FUNCTIONS

Standard POSIX

sysconf($name)

Returns the sysconf value related to the NAMEd constant. The $name must be a string. undef will be returned when the $name is not known by the system.

example:

my $ticks = sysconf('_SC_CLK_TCK') || 1000;

Additional

sysconf_names()

Returns a list with all known names, unsorted.

CONSTANTS

%sysconf

This exported variable is a tied HASH which maps _SC_* names on unique numbers, to be used with the system's sysconf() function.

The following constants where detected on your system when the module got installed. The second column shows the value which where returned at that time.

During installation, a symbol table will get inserted here.

SEE ALSO

This module is part of POSIX-1003 distribution version 1.02, built on November 10, 2020. Website: http://perl.overmeer.net/CPAN. The code is based on POSIX, which is released with Perl itself. See also POSIX::Util for additional functionality.

COPYRIGHTS

Copyrights 2011-2020 on the perl code and the related documentation 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://dev.perl.org/licenses/