NAME

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

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.

METHODS

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:

  During installation, a symbol table will get inserted here.

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

  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/