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Linux-SysInfo-0.15
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/ Linux::SysInfo

NAME

Linux::SysInfo - Perl interface to the sysinfo(2) Linux system call.

VERSION

Version 0.15

SYNOPSIS

    use Linux::SysInfo qw<sysinfo>;

    my $si = sysinfo;
    print "$_: $si->{$_}\n" for keys %$si;

DESCRIPTION

This module is a wrapper around the sysinfo(2) Linux system call. It gives information about the current uptime, load average, memory usage and processes running. Other systems have also this system call (e.g. Solaris), but in most cases the returned information is different.

CONSTANTS

LS_HAS_EXTENDED

This constant is set to 1 if your kernel supports the three extended fields totalhigh, freehigh and mem_unit ; and to 0 otherwise.

FUNCTIONS

sysinfo

This function takes no argument. It returns undef on failure or a hash reference whose keys are the members name of the struct sysinfo on success :

  • uptime

    Seconds elapsed since the system booted.

  • load1, load5, load15

    1, 5 and 15 minutes load average.

  • totalram

    Total usable main memory size.

  • freeram

    Available memory size.

  • sharedram

    Amount of shared memory.

  • bufferram

    Memory used by buffers.

  • totalswap

    Total swap space size.

  • freeswap

    Swap space still available.

  • procs

    Number of current processes.

Prior to Linux 2.3.23 on i386 and 2.3.48 on all other architectures, the memory sizes were given in bytes. Since then, the following members are also available and all the memory sizes are given as multiples of mem_unit bytes :

  • totalhigh

    Total high memory size.

  • freehigh

    Available high memory size.

  • mem_unit

    Memory unit size in bytes.

EXPORT

The only function of this module, sysinfo, and the constant LS_HAS_EXTENDED are only exported on request. Functions are also exported by the :funcs tag, and constants by :consts.

BINARY COMPATIBILITY

If you upgrade your kernel to a greater version than 2.3.23 on i386 or 2.3.48 on any other platform, you will need to rebuild the module to access the extended fields.

Moreover, since the perl hash function has changed after the 5.6 version, you will also need to recompile the module if you upgrade your perl from a version earlier than 5.6.

DEPENDENCIES

perl 5.6.

A C compiler. This module may happen to build with a C++ compiler as well, but don't rely on it, as no guarantee is made in this regard.

SEE ALSO

The sysinfo(2) man page.

Sys::Info : Gather information about your system.

Sys::CpuLoad : Try several different methods to retrieve the load average.

BSD::getloadavg : Wrapper to the getloadavg(3) BSD system call.

AUTHOR

Vincent Pit, <perl at profvince.com>, http://www.profvince.com.

You can contact me by mail or on irc.perl.org (vincent).

BUGS

Please report any bugs or feature requests to bug-linux-sysinfo at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Linux-SysInfo. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Linux::SysInfo

COPYRIGHT & LICENSE

Copyright 2007,2008,2009,2010,2013,2017 Vincent Pit, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.