1IO::Async::PID(3)     User Contributed Perl Documentation    IO::Async::PID(3)
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NAME

6       "IO::Async::PID" - event callback on exit of a child process
7

SYNOPSIS

9        use IO::Async::PID;
10        use POSIX qw( WEXITSTATUS );
11
12        use IO::Async::Loop;
13        my $loop = IO::Async::Loop->new;
14
15        my $kid = $loop->fork(
16           code => sub {
17              print "Child sleeping..\n";
18              sleep 10;
19              print "Child exiting\n";
20              return 20;
21           },
22        );
23
24        print "Child process $kid started\n";
25
26        my $pid = IO::Async::PID->new(
27           pid => $kid,
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29           on_exit => sub {
30              my ( $self, $exitcode ) = @_;
31              printf "Child process %d exited with status %d\n",
32                 $self->pid, WEXITSTATUS($exitcode);
33           },
34        );
35
36        $loop->add( $pid );
37
38        $loop->run;
39

DESCRIPTION

41       This subclass of IO::Async::Notifier invokes its callback when a
42       process exits.
43
44       For most use cases, a IO::Async::Process object provides more control
45       of setting up the process, connecting filehandles to it, sending data
46       to and receiving data from it.
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EVENTS

49       The following events are invoked, either using subclass methods or CODE
50       references in parameters:
51
52   on_exit $exitcode
53       Invoked when the watched process exits.
54

PARAMETERS

56       The following named parameters may be passed to "new" or "configure":
57
58   pid => INT
59       The process ID to watch. Must be given before the object has been added
60       to the containing IO::Async::Loop object.
61
62   on_exit => CODE
63       CODE reference for the "on_exit" event.
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65       Once the "on_exit" continuation has been invoked, the "IO::Async::PID"
66       object is removed from the containing IO::Async::Loop object.
67

METHODS

69   pid
70          $process_id = $pid->pid
71
72       Returns the underlying process ID
73
74   kill
75          $pid->kill( $signal )
76
77       Sends a signal to the process
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AUTHOR

80       Paul Evans <leonerd@leonerd.org.uk>
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84perl v5.28.0                      2018-07-14                 IO::Async::PID(3)