NAME

   P9Y::ProcessTable - Portably access the process table

SYNOPSIS

       use P9Y::ProcessTable;

       my @process_table = P9Y::ProcessTable->table;
       print $process_table[0]->pid."\n";

       my @pids = P9Y::ProcessTable->list;

       my $perl_process  = P9Y::ProcessTable->process;
       my $other_process = P9Y::ProcessTable->process($pids[0]);

       if ($other_process->has_threads) {
          print "# of Threads: ".$other_process->threads."\n";
          sleep 2;
          $other_process->refresh;
          print "# of Threads: ".$other_process->threads."\n";
       }

       # A cheap and sleazy version of ps
       my $FORMAT = "%-6s %-10s %-8s %-24s %s\n";
       printf($FORMAT, "PID", "TTY", "STAT", "START", "COMMAND");
       foreach my $p ( P9Y::ProcessTable->table ) {
          printf($FORMAT,
             $p->pid,
             $p->ttydev,
             $p->state,
             scalar(localtime($p->start)),
             $p->cmdline,
          );
       }

       # Dump all the information in the current process table
       foreach my $p ( P9Y::ProcessTable->table ) {
          print "--------------------------------\n";
          foreach my $f (P9Y::ProcessTable->fields) {
             my $has_f = 'has_'.$f;
             print $f, ":  ", $p->$f(), "\n" if ( $p->$has_f() );
          }
       }

DESCRIPTION

   This interface will portably access the process table, no matter what
   the OS, and normalize its outputs to work similar across all platforms.

METHODS

   All methods to this module are actually class-based (objectless) calls.
   However, the P9Y::ProcessTable::Process returns are actual objects.

fields

   Returns a list of the field names supported by the module on the
   current architecture.

list

   Returns a list of PIDs that are available in the process table. On most
   systems, this is a less heavy call than table, as it doesn't have to
   look up the information for every single process.

table

   Returns a list of P9Y::ProcessTable::Process objects for all of the
   processes in the process table. (More information in that module POD.)

process

   Returns a P9Y::ProcessTable::Process object for the process specified.
   If a process isn't specified, it will look up $$ (or its platform
   equivalent).

P9Y?

   Portability. You know, like I18N and L10N.

SUPPORTED PLATFORMS

   Currently, this module supports:

     * All /proc friendly OSs to some degree. Linux, Solaris, and most
     /proc friendly BSD-variants are fully supported so far.

     * Windows (most flavors)

     * Darwin (see CAVEATS)

     * FreeBSD (only; see CAVEATS)

     * OS/2 (hey, the module was there...)

     * VMS (same here; probably needs some testing)

HISTORY

   This module spawned because Proc::ProcessTable has fallen into bugland
   <http://matrix.cpantesters.org/?dist=Proc-ProcessTable-0.45> for the
   last 4 years, and many people just want to be able to get a simple
   PID+cmdline from the process table. While this module offers more than
   that as a bonus, the goal of this module is to have something that JFW,
   and continues to JFW.

   With that in mind, here my list of what went wrong with
   Proc::ProcessTable. I have nothing against the authors of that module,
   but I feel like we should try to learn from our failures and adapt in
   kind.

     * Too many OSs in one distribution. I dunno about you, but I don't
     happen to have 15 different OSs on VMs anywhere. At best, I might
     have access to 2-3 different platforms. So, trying to test out code
     on a platform that you don't actually own is especially difficult.

     Thus, this module is merely a wrapper around various other modules
     that provide process table information. Those guys actually have the
     means (and the drive) to test their stuff on those OSs. (The sole
     exception is the ProcFS module, but that may get split eventually.)

     * Too much C/XS code. The C and XS code falls in a class of
     exclusivity that makes it even harder to maintain. If I were to
     conjure up some wild guess, I would say that only 20% of Perl
     programmers could actually read, understand, and program C/XS code.
     People aren't calling the process table a 1000 times a second, so
     there's really no need for a speed boost, either.

     Alas, sometimes this is unavoidable, with the process information
     buried in C library calls. However, the /proc FS is available on a
     great many amount of UNIX platforms, so it should be used as much as
     possible. Also, I take this moment to shake my tiny little fist at
     the BSD folks for actually regressing the OS by removing support for
     /proc. All of the reasons behind it are unsound or have solutions
     that don't involve removing this most basic right of UNIX users.

CAVEATS / TODO

     * No support for any non-proc BSD system other than FreeBSD. This is
     because BSD::Process only supports FreeBSD. If the support is needed,
     bug that module maintainer and provide some patches. Then bug me and
     I'll change the OS detection logic.

     * This thing actually uses Proc::ProcessTable for any system that
     isn't in the list and doesn't have /proc, including Darwin/OSX
     systems. Fortunately, P:PT is passing all Darwin tests (so far), so
     until somebody splits the code from that to a new module (hint
     hint)... And fortunately, P:PT gained a non-broken release.

     * Certain other /proc friendly OSs needs further support. Frankly,
     I'm trying to get a feel for what people actually need than just
     spending the time coding something for, say, NeXT OS and 50 other
     flavors. However, supporting one OS or another should be pretty easy.
     If you need support, dive into the ProcFS code and submit a patch.

     * See P9Y::ProcessTable::Process for other caveats.

SEE ALSO

     * Proc::ProcessTable

     * BSD::Process

     * Win32::Process::Info & Win32::Process

     * OS2::Process

     * VMS::Process

AVAILABILITY

   The project homepage is https://github.com/SineSwiper/P9Y-ProcessTable.

   The latest version of this module is available from the Comprehensive
   Perl Archive Network (CPAN). Visit http://www.perl.com/CPAN/ to find a
   CPAN site near you, or see
   https://metacpan.org/module/P9Y::ProcessTable/.

SUPPORT

Internet Relay Chat

   You can get live help by using IRC ( Internet Relay Chat ). If you
   don't know what IRC is, please read this excellent guide:
   http://en.wikipedia.org/wiki/Internet_Relay_Chat. Please be courteous
   and patient when talking to us, as we might be busy or sleeping! You
   can join those networks/channels and get help:

     * irc.perl.org

     You can connect to the server at 'irc.perl.org' and talk to this
     person for help: SineSwiper.

Bugs / Feature Requests

   Please report any bugs or feature requests via
   https://github.com/SineSwiper/P9Y-ProcessTable/issues.

AUTHOR

   Brendan Byrd <[email protected]>

CONTRIBUTORS

     * Chris 'BinGOs' Williams <[email protected]>

     * Mithun Ayachit <[email protected]>

COPYRIGHT AND LICENSE

   This software is Copyright (c) 2015 by Brendan Byrd.

   This is free software, licensed under:

     The Artistic License 2.0 (GPL Compatible)

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