NAME

POSIX::1003::Limit - POSIX access to ulimit and rlimit

INHERITANCE

POSIX::1003::Limit
  is a POSIX::1003

SYNOPSIS

# ULIMIT support

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

use POSIX::1003::Limit qw(ulimit);
# keys are strings!
$size = ulimit('UL_GETFSIZE');

use POSIX::1003::Limit qw(ulimit UL_GETFSIZE);
$size = UL_GETFSIZE;   # constants are subs

use POSIX::1003::Limit '%ulimit';
my $key = $ulimit{UL_GETFSIZE};
$ulimit{_SC_NEW_KEY} = $key_code;
$size = ulimit($key);

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

# RLIMIT support

use POSIX::1003::Limit ':rlimit';

my ($cur, $max, $success) = getrlimit('RLIMIT_CORE');
my ($cur, $max) = getrlimit('RLIMIT_CORE');
my $cur = RLIMIT_CORE;

my $success = setrlimit('RLIMIT_CORE', 1e6, 1e8);
setrlimit('RLIMIT_CORE', 1e6) or die;
setrlimit('RLIMIT_CORE', RLIM_SAVED_MAX, RLIM_INFINITY);
RLIMIT_CORE(1e6, 1e8);

DESCRIPTION

This module provides access to the "ulimit" (user limit) and "rlimit" (resource limit) handling. On most systems, ulimit() is succeeded by rlimit() hence provides a very limited set of features.

Exporter

METHODS

POSIX::1003::Limit->exampleValue(NAME)

See "METHODS" in POSIX::1003

FUNCTIONS

Standard POSIX

getrlimit(RESOURCE)

my ($cur, $max, $success) = getrlimit('RLIMIT_CORE');
my ($cur, $max) = getrlimit('RLIMIT_CORE');

setrlimit(RESOURCE, CUR, [MAX])

my $success = setrlimit('RLIMIT_CORE', 1e6, 1e8);

ulimit(NAME)

Returns the ulimit 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.

my $filesize = ulimit('UL_GETFSIZE') || SSIZE_MAX;

Additional

rlimit_names()

Returns a list with all known resource names, unsorted.

ulimit_names()

Returns a list with all known names, unsorted.

CONSTANTS

%ulimit

This exported variable is a tied HASH which maps UL_* names on unique numbers, to be used with ulimit().

%rlimit

This exported variable is a tied HASH which maps RLIMIT_* names on unique numbers, to be used with getrlimit() and setrlimit().

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.

For ulimit, with a value when it is a getter:

If you install the module, the table will be filled-in here

The constant names for rlimit, with the soft and hard limits that getrlimit() returned during installation of the module.

If you install the module, the table will be filled-in here

SEE ALSO

This module is part of POSIX-1003 distribution version 0.11, built on January 04, 2012. Website: http://perl.overmeer.net. The code is based on POSIX, which is released with Perl itself.

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