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

NAME
       Reflex::Signal -	receive	callbacks when signals arrive

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

SYNOPSIS
       eg/eg-39-signals.pl

	       use warnings;
	       use strict;

	       use Reflex::Signal;
	       use Reflex::Callbacks qw(cb_coderef);
	       use ExampleHelpers qw(eg_say);

	       eg_say("Process $$ is waiting for SIGUSR1 and SIGUSR2.");

	       my $usr1	= Reflex::Signal->new(
		       signal	 => "USR1",
		       on_signal => cb_coderef { eg_say("Got SIGUSR1.")	},
	       );

	       my $usr2	= Reflex::Signal->new( signal => "USR2"	);
	       while ($usr2->next()) {
		       eg_say("Got SIGUSR2.");
	       }

DESCRIPTION
       Reflex::Signal waits for	signals	from the operating system.  It may
       invoke callback functions and/or	be used	as a promise of	new signals
       depending on the	application's needs.

       Reflex::Signal is almost	entirely implemented in
       Reflex::Role::SigCatcher.  That role's documentation contains important
       details that won't be covered here.

       Reflex::Signal is not suitable for SIGCHLD use.	The specialized
       Reflex::PID class is used for that, and it will automatically wait()
       for processes and return	their exit statuses.

   Public Attributes
       signal

       Reflex:Signal's "signal"	attribute defines the name of the signal to
       catch.  Names are as those in %SIG, namely with the leading "SIG"
       scraped off.

       active

       The "active" attribute controls whether the signal catcher will be
       started in an actively catching state.  It defaults to true; set	it to
       false if	you'd like to activate the signal catcher later.

   Public Methods
       start

       Reflex::Signal's	start()	method may be used to initialize signal
       catchers	and start them watching	for signals.  start() will be called
       automatically if	the signal catcher is started in the active state,
       which it	is by default.

       Signal catchers may not be stopped, paused or resumed until they	have
       been started.

       stop

       The stop() method stops and finalizes the signal	catcher.  It's
       automatically called at DEMOLISH	time, just in case it hasn't already
       been.

       pause

       pause() pauses the signal catcher without finalizing it.	 This is a
       lighter-weight, non-final version of stop().

       resume

       resume()	resumes	a paused signal	catcher	without	re-initializing	it.
       This is a lighter-weight, non-initial version of	start().

   Callbacks
       on_signal

       The on_signal() callback	notifies the user when the watched signal has
       been caught.  It	includes no parameters of note.

       on_data

       on_data() will be called	whenever Reflex::Stream	receives data.	It
       will include one	named parameter	in $_[1], "data", containing raw
       octets received from the	stream.

	       sub on_data {
		       my ($self, $param) = @_;
		       print "Got data:	$param->{data}\n";
	       }

       The default on_data() callback will emit	a "data" event.

       on_error

       on_error() will be called if an error occurs reading from or writing to
       the stream's handle.  Its parameters are	the usual for Reflex:

	       sub on_error {
		       my ($self, $param) = @_;
		       print "$param->{errfun} error $param->{errnum}: $param->{errstr}\n";
	       }

       The default on_error() callback will emit a "error" event.  It will
       also call stopped().

       When overriding this callback, please be	sure to	call stopped(),	which
       is provided by Reflex::Role::Collectible.  Calling stopped() is vital
       for collectible objects to be released from memory when managed by
       Reflex::Collection.

   Public Events
       Reflex::Stream emits stream-related events, naturally.

       closed

       The "closed" event indicates that the stream is closed.	This is	most
       often caused by the remote end of a socket closing their	connection.

       See "on_closed" for more	details.

       data

       The "data" event	is emitted when	a stream produces data to work with.
       It includes a single parameter, also "data", containing the raw octets
       read from the handle.

       See "on_data" for more details.

       error

       Reflex::Stream emits "error" when any of	a number of calls fails.

       See "on_error" for more details.

EXAMPLES
       eg/EchoStream.pm	in the distribution is the same	EchoStream that
       appears in the SYNOPSIS.

       eg/eg-38-promise-client.pl shows	a lengthy inline usage of
       Reflex::Stream and a few	other classes.

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

       o   Reflex

       o   Reflex

       o   Reflex::Role::SigCatcher

       o   Reflex::Role::PidCatcher

       o   Reflex::PID

       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::Signal(3)

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

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