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Reflex::PID(3)	      User Contributed Perl Documentation	Reflex::PID(3)

NAME
       Reflex::PID - Watch the exit of a subprocess by its SIGCHLD signal.

VERSION
       This document describes version 0.100, released on April	02, 2017.

SYNOPSIS
       # Not a complete	program.  Please see the source	for #
       Reflex::POE::Wheel::Run for one example.

	       use Reflex::PID;

	       watches pid_watcher => (
		       isa   =>	'Reflex::PID|Undef',
		       role  =>	'process',
	       );

	       sub some_method {
		       my $self	= shift;

		       my $pid = fork();
		       die $! unless defined $pid;
		       exec("some-program.pl") unless $pid;

		       # Parent	here.
		       $self->sigchild_watcher(
			       Reflex::PID->new(pid => $pid)
		       );
	       }

	       sub on_process_exit {
		       # Handle	the event.
	       }

DESCRIPTION
       Reflex::PID waits for a particular child	process	to exit.  It emits a
       "signal"	event with information about the child process when it has
       detected	the child has exited.

       Since Reflex::PID waits for a particular	process	ID, it's pretty	much
       useless afterwards.  Consider pairing it	with Reflex::Collection	if you
       have to maintain	several	transient processes.

       Reflex::PID extends Reflex::Signal to handle a particular kind of
       signal---SIGCHLD.

       TODO - However, first we	need to	make Reflex::PID objects stop
       themselves and emit "stopped" events when they're done.	Otherwise
       Reflex::Collection won't	know when to destroy them.

   Public Events
       exit

       Reflex::PID's "exit" event includes two named parameters.  "pid"
       contains	the process ID that exited.  "exit" contains the process' exit
       value---a copy of $? at the time	the process exited.  Please see	"$?"
       in perlvar for more information about that special Perl variable.

SEE ALSO
       Please see those	modules/websites for more information related to this
       module.

       o   Reflex

       o   Moose::Manual::Concepts

       o   Reflex

       o   Reflex::Signal

       o   Reflex::POE::Wheel::Run

       o   "ACKNOWLEDGEMENTS" in Reflex

       o   "ASSISTANCE"	in Reflex

       o   "AUTHORS" in	Reflex

       o   "BUGS" in Reflex

       o   "BUGS" in Reflex

       o   "CONTRIBUTORS" in Reflex

       o   "COPYRIGHT" in Reflex

       o   "LICENSE" in	Reflex

       o   "TODO" in Reflex

BUGS AND LIMITATIONS
       You can make new	bug reports, and view existing ones, through the web
       interface at <http://rt.cpan.org/Public/Dist/Display.html?Name=Reflex>.

AUTHOR
       Rocco Caputo <rcaputo@cpan.org>

COPYRIGHT AND LICENSE
       This software is	copyright (c) 2017 by Rocco Caputo.

       This is free software; you can redistribute it and/or modify it under
       the same	terms as the Perl 5 programming	language system	itself.

AVAILABILITY
       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/Reflex/>.

DISCLAIMER OF WARRANTY
       BECAUSE THIS SOFTWARE IS	LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
       FOR THE SOFTWARE, TO THE	EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT
       WHEN OTHERWISE STATED IN	WRITING	THE COPYRIGHT HOLDERS AND/OR OTHER
       PARTIES PROVIDE THE SOFTWARE "AS	IS" WITHOUT WARRANTY OF	ANY KIND,
       EITHER EXPRESSED	OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
       WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
       ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF	THE SOFTWARE IS	WITH
       YOU. SHOULD THE SOFTWARE	PROVE DEFECTIVE, YOU ASSUME THE	COST OF	ALL
       NECESSARY SERVICING, REPAIR, OR CORRECTION.

       IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR	AGREED TO IN WRITING
       WILL ANY	COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
       REDISTRIBUTE THE	SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE
       TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR
       CONSEQUENTIAL DAMAGES ARISING OUT OF THE	USE OR INABILITY TO USE	THE
       SOFTWARE	(INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
       RENDERED	INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
       FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
       SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
       DAMAGES.

perl v5.32.1			  2017-04-02			Reflex::PID(3)

NAME | VERSION | SYNOPSIS | DESCRIPTION | SEE ALSO | BUGS AND LIMITATIONS | AUTHOR | COPYRIGHT AND LICENSE | AVAILABILITY | DISCLAIMER OF WARRANTY

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