NAME

       System::Command::Reaper - Reap processes started by System::Command

VERSION

       version 1.107

SYNOPSIS

       This class is used for internal purposes.  Move along, nothing to see here.

DESCRIPTION

       The System::Command objects delegate the reaping of child processes to
       System::Command::Reaper objects. This allows a user to create a System::Command and
       discard it after having obtained one or more references to its handles connected to the
       child process.

       The typical use case looks like this:

           my $fh = System::Command->new( @cmd )->stdout();

       The child process is reaped either through a direct call to "close()" or when the command
       object and all its handles have been destroyed, thus avoiding zombies (which would be
       reaped by the system at the end of the main program).

       This is possible thanks to the following reference graph:

               System::Command
                |   |   |  ^|
                v   v   v  !|
               in out err  !|
               ^|  ^|  ^|  !|
               !v  !v  !v  !v
           System::Command::Reaper

       Legend:
           | normal ref
           ! weak ref

       The System::Command::Reaper object acts as a sentinel, that takes care of reaping the
       child process when the original System::Command and its filehandles have been destroyed
       (or when System::Command "close()" method is being called).

METHODS

       System::Command::Reaper supports the following methods:

   new( $command )
       Create a new System::Command::Reaper object attached to the System::Command object passed
       as a parameter.

   close()
       Close all the opened filehandles of the main System::Command object, reaps the child
       process, and updates the main object with the status information of the child process.

       "DESTROY" calls "close()" when the sentinel is being destroyed.

   is_terminated()
       Returns a true value if the underlying process was terminated.

       If the process was indeed terminated, collects exit status, etc.

AUTHOR

       Philippe Bruhat (BooK), "<book at cpan.org>"

ACKNOWLEDGEMENTS

       This scheme owes a lot to Vincent Pit who on #perlfr provided the general idea (use a
       proxy to delay object destruction and child process reaping) with code examples, which I
       then adapted to my needs.

COPYRIGHT

       Copyright 2010-2013 Philippe Bruhat (BooK), all rights reserved.

LICENSE

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