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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2010-2011 -- leonerd@leonerd.org.uk |
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package IO::Async::PID; |
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184498
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use strict; |
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use warnings; |
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use base qw( IO::Async::Notifier ); |
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1272
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our $VERSION = '0.801'; |
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use Carp; |
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1038
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=head1 NAME |
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C - event callback on exit of a child process |
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=head1 SYNOPSIS |
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use IO::Async::PID; |
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use POSIX qw( WEXITSTATUS ); |
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use IO::Async::Loop; |
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my $loop = IO::Async::Loop->new; |
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my $kid = $loop->fork( |
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code => sub { |
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print "Child sleeping..\n"; |
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sleep 10; |
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print "Child exiting\n"; |
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return 20; |
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}, |
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); |
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print "Child process $kid started\n"; |
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my $pid = IO::Async::PID->new( |
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pid => $kid, |
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on_exit => sub { |
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my ( $self, $exitcode ) = @_; |
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printf "Child process %d exited with status %d\n", |
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$self->pid, WEXITSTATUS($exitcode); |
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}, |
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); |
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$loop->add( $pid ); |
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$loop->run; |
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=head1 DESCRIPTION |
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This subclass of L invokes its callback when a process |
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exits. |
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For most use cases, a L object provides more control of |
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setting up the process, connecting filehandles to it, sending data to and |
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receiving data from it. |
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=cut |
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=head1 EVENTS |
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The following events are invoked, either using subclass methods or CODE |
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references in parameters: |
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=head2 on_exit $exitcode |
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Invoked when the watched process exits. |
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=cut |
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=head1 PARAMETERS |
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The following named parameters may be passed to C or C: |
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=head2 pid => INT |
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The process ID to watch. Must be given before the object has been added to the |
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containing L object. |
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=head2 on_exit => CODE |
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CODE reference for the C event. |
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Once the C continuation has been invoked, the C |
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object is removed from the containing L object. |
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=cut |
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sub configure |
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{ |
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my $self = shift; |
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my %params = @_; |
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if( exists $params{pid} ) { |
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$self->loop and croak "Cannot configure 'pid' after adding to Loop"; |
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$self->{pid} = delete $params{pid}; |
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} |
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if( exists $params{on_exit} ) { |
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$self->{on_exit} = delete $params{on_exit}; |
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undef $self->{cb}; |
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if( my $loop = $self->loop ) { |
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$self->_remove_from_loop( $loop ); |
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$self->_add_to_loop( $loop ); |
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} |
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} |
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$self->SUPER::configure( %params ); |
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} |
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sub _add_to_loop |
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{ |
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my $self = shift; |
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my ( $loop ) = @_; |
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$self->pid or croak "Require a 'pid' in $self"; |
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$self->SUPER::_add_to_loop( @_ ); |
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# on_exit continuation gets passed PID value; need to replace that with |
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# $self |
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$self->{cb} ||= $self->_replace_weakself( sub { |
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my $self = shift or return; |
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my ( $exitcode ) = @_; |
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$self->invoke_event( on_exit => $exitcode ); |
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# Since this is a oneshot, we'll have to remove it from the loop or |
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# parent Notifier |
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$self->remove_from_parent; |
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} ); |
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$loop->watch_process( $self->pid, $self->{cb} ); |
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} |
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sub _remove_from_loop |
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{ |
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my $self = shift; |
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my ( $loop ) = @_; |
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$loop->unwatch_process( $self->pid ); |
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} |
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sub notifier_name |
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{ |
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my $self = shift; |
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1
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if( length( my $name = $self->SUPER::notifier_name ) ) { |
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return $name; |
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} |
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1
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return $self->{pid}; |
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} |
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=head1 METHODS |
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=cut |
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164
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=head2 pid |
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$process_id = $pid->pid |
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168
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Returns the underlying process ID |
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=cut |
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sub pid |
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{ |
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my $self = shift; |
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return $self->{pid}; |
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} |
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=head2 kill |
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$pid->kill( $signal ) |
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Sends a signal to the process |
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=cut |
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186
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sub kill |
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{ |
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1
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my $self = shift; |
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1
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my ( $signal ) = @_; |
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1
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kill $signal, $self->pid or croak "Cannot kill() - $!"; |
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} |
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194
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=head1 AUTHOR |
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196
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Paul Evans |
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198
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=cut |
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200
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0x55AA; |