| IO::Async::PID(3pm) | User Contributed Perl Documentation | IO::Async::PID(3pm) |
"IO::Async::PID" - event callback on exit of a child process
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;
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.
The following events are invoked, either using subclass methods or CODE references in parameters:
Invoked when the watched process exits.
The following named parameters may be passed to "new" or "configure":
The process ID to watch. Must be given before the object has been added to the containing IO::Async::Loop object.
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.
$process_id = $pid->pid
Returns the underlying process ID
$pid->kill( $signal )
Sends a signal to the process
Paul Evans <leonerd@leonerd.org.uk>
| 2021-01-23 | perl v5.32.0 |