NAME

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

SYNOPSIS

        use IO::Async::PID;
        use POSIX qw( WEXITSTATUS );

        use IO::Async::Loop;
        my $loop = IO::Async::Loop->new;

        my $kid = $loop->fork(
           code => sub {
              print "Child sleeping..\n";
              sleep 10;
              print "Child exiting\n";
              return 20;
           },
        );

        print "Child process $kid started\n";

        my $pid = IO::Async::PID->new(
           pid => $kid,

           on_exit => sub {
              my ( $self, $exitcode ) = @_;
              printf "Child process %d exited with status %d\n",
                 $self->pid, WEXITSTATUS($exitcode);
           },
        );

        $loop->add( $pid );

        $loop->run;

DESCRIPTION

       This subclass of IO::Async::Notifier invokes its callback when a process exits.

       For most use cases, a IO::Async::Process object provides more control of setting up the
       process, connecting filehandles to it, sending data to and receiving data from it.

EVENTS

       The following events are invoked, either using subclass methods or CODE references in
       parameters:

   on_exit $exitcode
       Invoked when the watched process exits.

PARAMETERS

       The following named parameters may be passed to "new" or "configure":

       pid => INT
               The process ID to watch. Must be given before the object has been added to the
               containing "IO::Async::Loop" object.

       on_exit => CODE
               CODE reference for the "on_exit" event.

       Once the "on_exit" continuation has been invoked, the "IO::Async::PID" object is removed
       from the containing "IO::Async::Loop" object.

METHODS

   $process_id = $pid->pid
       Returns the underlying process ID

   $pid->kill( $signal )
       Sends a signal to the process

AUTHOR

       Paul Evans <leonerd@leonerd.org.uk>