Unix::Statgrab(3)

NAME
Unix::Statgrab - Perl extension for collecting information about the machine

SYNOPSIS
    use Unix::Statgrab;

    my $host_stats = get_host_info();
    print $host_stats->hostname . " is a " . $host_stats->bitwidth . " " . $host_stats->os_name . "\n";

    my $filesystems = get_fs_stats();
    my @mount_points = map { $filesystems->mnt_point($_) } (0 .. $filesystems->entries() - 1);
    print $host_stats->hostname . " has " . join( ", ", @mount_points ) . " mounted\n";

    my $proc_list = get_process_stats();
    my @proc_by_type;
    foreach my $proc_entry (0 .. $proc_list->entries() - 1) {
        $proc_by_type[$proc_list->state($proc_entry)]++;
    }
    my $total_procs = 0;
    $total_procs += $_ for grep { defined $_ } @proc_by_type;
    foreach my $state (qw(SG_PROCESS_STATE_RUNNING SG_PROCESS_STATE_SLEEPING
                          SG_PROCESS_STATE_STOPPED SG_PROCESS_STATE_ZOMBIE
                                          SG_PROCESS_STATE_UNKNOWN)) {
        defined $proc_by_type[Unix::Statgrab->$state] or next;
        print $proc_by_type[Unix::Statgrab->$state] . " of " . $total_procs . " procs in $state\n";
    }

    my $last_cpu_stats = get_cpu_stats() or croak( get_error()->strperror() );
    do_sth_way_longer();
    my $cpu_diff = get_cpu_stats()->get_cpu_stats_diff($last_cpu_stats);

    my $last_cpu_percent = $last_cpu_percent->get_cpu_percents();
    my $diff_cpu_percent = $cpu_diff->get_cpu_percents();
    my $now_cpu_percent = get_cpu_stats()->get_cpu_percents();

DESCRIPTION
Unix::Statgrab is a wrapper for libstatgrab as available from <http://www.i-scream.org/libstatgrab/>. It is a reasonably portable attempt to query interesting stats about your computer. It covers information on the operating system, CPU, memory usage, network interfaces, hard-disks etc.

Each of the provided functions follow a simple rule: It never takes any argument and returns either an object (in case of success) or "undef". In case "undef" was returned, check the return value of "get_error". Also see "ERROR HANDLING" further below.

To avoid error during copying documentation, the original function documentation will be refererred where reasonable. Each returned object has a getter method named as the attribute in original documentation. Those getters take a optional index argument, asking for the attribute of the "n"th statistic item. Further, each object provides an "entries"() method, telling you how much statistics for requested type are returned (yes, even "get_host_info()" has that, maybe we have more host_info when grabbing that statistic in a cluster, grid or cloud). Additionally, for the users of Perl's list processing features, each object has an "as_list"() method which returns the statistic as list of hash items containing each attribute / value pair of available attributes.

FUNCTIONS

  drop_privileges()
Unix::Statgrab can be told to discard setuid and setgid privileges which is usually a good thing. If your program doesn't need the elevated privileges somewhere else, call it right after "use"ing the module.

This function is depreciated and might be removed in a future version of libstatgrab (and then in Unix::Statgrab, too).

  get_host_info()
Returns generic information about this machine. The object it returns is a Unix::Statgrab::sg_host_info.

  get_cpu_stats
Returns information about this machine's usage of the CPU. The object it returns is an Unix::Statgrab::sg_cpu_stats.

  get_disk_io_stats
Delivers the disk IO per disk stored in the kernel which holds the amount of data transferred since boot. The object it returns is a Unix::Statgrab::sg_disk_io_stats.

  get_fs_stats
Returns statistics about the mounted filesystems. The object it returns is a Unix::Statgrab::sg_fs_stats.

  get_load_stats
Returns the load average over various span of times. The object it returns is a Unix::Statgrab::sg_load_stats.

  get_mem_stats
Returns statistics about memory usage. The object it returns is a Unix::Statgrab::sg_mem_stats.

  get_swap_stats
Returns statistics about swap usage. The object it returns is a Unix::Statgrab::sg_swap_stats.

  get_network_io_stats
Returns statistics about the network traffic per network interface as stored in the kernel. The object it returns is a Unix::Statgrab::sg_network_io_stats.

  get_network_iface_stats
Returns statistics about each of the found network interfaces in your computer. The object it returns is a Unix::Statgrab::sg_network_iface_stats.

  get_page_stats
Returns the number of pages the system has paged in and out since bootup. The object it returns is a Unix::Statgrab::sg_page_stats.

  get_process_stats
Returns loads of information about the current processes. The object it returns is a Unix::Statgrab::sg_process_stats.

  get_user_stats
Returns session information about logged on users. The object it returns is a Unix::Statgrab::sg_user_stats.

ERROR HANDLING
One function "get_error" exists that will return the last error encountered, if any. It's return value is an object of type Unix::Statgrab::sg_error_details.

EXPORT
All by default. This means all of the above functions plus the following constants:

  SG_ERROR_NONE
  SG_ERROR_INVALID_ARGUMENT
  SG_ERROR_ASPRINTF
  SG_ERROR_SPRINTF
  SG_ERROR_DEVICES
  SG_ERROR_DEVSTAT_GETDEVS
  SG_ERROR_DEVSTAT_SELECTDEVS
  SG_ERROR_DISKINFO
  SG_ERROR_ENOENT
  SG_ERROR_GETIFADDRS
  SG_ERROR_GETMNTINFO
  SG_ERROR_GETPAGESIZE
  SG_ERROR_HOST
  SG_ERROR_KSTAT_DATA_LOOKUP
  SG_ERROR_KSTAT_LOOKUP
  SG_ERROR_KSTAT_OPEN
  SG_ERROR_KSTAT_READ
  SG_ERROR_KVM_GETSWAPINFO
  SG_ERROR_KVM_OPENFILES
  SG_ERROR_MALLOC
  SG_ERROR_MEMSTATUS
  SG_ERROR_OPEN
  SG_ERROR_OPENDIR
  SG_ERROR_READDIR
  SG_ERROR_PARSE
  SG_ERROR_PDHADD
  SG_ERROR_PDHCOLLECT
  SG_ERROR_PDHOPEN
  SG_ERROR_PDHREAD
  SG_ERROR_PERMISSION
  SG_ERROR_PSTAT
  SG_ERROR_SETEGID
  SG_ERROR_SETEUID
  SG_ERROR_SETMNTENT
  SG_ERROR_SOCKET
  SG_ERROR_SWAPCTL
  SG_ERROR_SYSCONF
  SG_ERROR_SYSCTL
  SG_ERROR_SYSCTLBYNAME
  SG_ERROR_SYSCTLNAMETOMIB
  SG_ERROR_SYSINFO
  SG_ERROR_MACHCALL
  SG_ERROR_IOKIT
  SG_ERROR_UNAME
  SG_ERROR_UNSUPPORTED
  SG_ERROR_XSW_VER_MISMATCH
  SG_ERROR_GETMSG
  SG_ERROR_PUTMSG
  SG_ERROR_INITIALISATION
  SG_ERROR_MUTEX_LOCK
  SG_ERROR_MUTEX_UNLOCK

  sg_unknown_configuration
  sg_physical_host
  sg_virtual_machine
  sg_paravirtual_machine
  sg_hardware_virtualized

  sg_fs_unknown
  sg_fs_regular
  sg_fs_special
  sg_fs_loopback
  sg_fs_remote
  sg_fs_local
  sg_fs_alltypes

  SG_IFACE_DUPLEX_FULL
  SG_IFACE_DUPLEX_HALF
  SG_IFACE_DUPLEX_UNKNOWN

  SG_IFACE_DOWN
  SG_IFACE_UP

  SG_PROCESS_STATE_RUNNING
  SG_PROCESS_STATE_SLEEPING
  SG_PROCESS_STATE_STOPPED
  SG_PROCESS_STATE_ZOMBIE
  SG_PROCESS_STATE_UNKNOWN

If you don't want that, use the module thusly:

    use Unix::Statgrab ();

or provide a list of those symbols you want:

    use Unix::Statgrab qw/get_network_iface_stats
                          SG_IFACE_DUPLEX_FULL
                          SG_IFACE_DUPLEX_HALF
                          SG_IFACE_DUPLEX_UNKNOWN/;

SEE ALSO
The excellent and very complete manpage of statgrab(3). You can get additional information for each of the above functions by prefixing the function name with "sg_" and feed it to "man":

    man sg_get_network_iface_stats

libstatgrab's home is at <http://www.i-scream.org/libstatgrab/>

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

    perldoc Unix::Statgrab

You can also look for information at:

•   RT: CPAN's request tracker

    <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Unix-Statgrab>

•   AnnoCPAN: Annotated CPAN documentation

    <http://annocpan.org/dist/Unix-Statgrab>

•   CPAN Ratings

    <http://cpanratings.perl.org/s/Unix-Statgrab>

•   CPAN Search

    <http://search.cpan.org/dist/Unix-Statgrab/>

  Where can I go for help?
If you have a bug report, a patch or a suggestion, please open a new report ticket at CPAN (but please check previous reports first in case your issue has already been addressed). You can mail any of the module maintainers, but you are more assured of an answer by posting to the i-scream-users list or reporting the issue in RT.

Report tickets should contain a detailed description of the bug or enhancement request and at least an easily verifiable way of reproducing the issue or fix. Patches are always welcome, too.

  Where can I go for help with a concrete version?
Bugs and feature requests are accepted against the latest version only. To get patches for earlier versions, you need to get an agreement with a developer of your choice - who may or not report the issue and a suggested fix upstream (depends on the license you have chosen).

  Business support and maintenance
For business support you can contact Jens via his CPAN email address rehsackATcpan.org. Please keep in mind that business support is neither available for free nor are you eligible to receive any support based on the license distributed with this package.

AUTHOR
Tassilo von Parseval, <tassilo.von.parseval@rwth-aachen.de>

Jens Rehsack, <rehsack AT cpan.org>

COPYRIGHT AND LICENSE
Copyright (C) 2004-2005 by Tassilo von Parseval

Copyright (C) 2012-2015 by Jens Rehsack

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.