This file is indexed.

/usr/share/perl5/IO/Async/PID.pm is in libio-async-perl 0.61-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
#  You may distribute under the terms of either the GNU General Public License
#  or the Artistic License (the same terms as Perl itself)
#
#  (C) Paul Evans, 2010-2011 -- leonerd@leonerd.org.uk

package IO::Async::PID;

use strict;
use warnings;
use base qw( IO::Async::Notifier );

our $VERSION = '0.61';

use Carp;

=head1 NAME

C<IO::Async::PID> - event callback on exit of a child process

=head1 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;

=head1 DESCRIPTION

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

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

=cut

=head1 EVENTS

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

=head2 on_exit $exitcode

Invoked when the watched process exits.

=cut

=head1 PARAMETERS

The following named parameters may be passed to C<new> or C<configure>:

=over 8

=item pid => INT

The process ID to watch. Must be given before the object has been added to the
containing C<IO::Async::Loop> object.

=item on_exit => CODE

CODE reference for the C<on_exit> event.

=back

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

=cut

sub configure
{
   my $self = shift;
   my %params = @_;

   if( exists $params{pid} ) {
      $self->loop and croak "Cannot configure 'pid' after adding to Loop";
      $self->{pid} = delete $params{pid};
   }

   if( exists $params{on_exit} ) {
      $self->{on_exit} = delete $params{on_exit};

      undef $self->{cb};

      if( my $loop = $self->loop ) {
         $self->_remove_from_loop( $loop );
         $self->_add_to_loop( $loop );
      }
   }

   $self->SUPER::configure( %params );
}

sub _add_to_loop
{
   my $self = shift;
   my ( $loop ) = @_;

   $self->pid or croak "Require a 'pid' in $self";

   $self->SUPER::_add_to_loop( @_ );

   # on_exit continuation gets passed PID value; need to replace that with
   # $self
   $self->{cb} ||= $self->_replace_weakself( sub {
      my $self = shift or return;
      my ( $exitcode ) = @_;

      $self->invoke_event( on_exit => $exitcode );

      # Since this is a oneshot, we'll have to remove it from the loop or
      # parent Notifier
      $self->remove_from_parent;
   } );

   $loop->watch_child( $self->pid, $self->{cb} );
}

sub _remove_from_loop
{
   my $self = shift;
   my ( $loop ) = @_;

   $loop->unwatch_child( $self->pid );
}

sub notifier_name
{
   my $self = shift;
   if( length( my $name = $self->SUPER::notifier_name ) ) {
      return $name;
   }

   return $self->{pid};
}

=head1 METHODS

=cut

=head2 $process_id = $pid->pid

Returns the underlying process ID

=cut

sub pid
{
   my $self = shift;
   return $self->{pid};
}

=head2 $pid->kill( $signal )

Sends a signal to the process

=cut

sub kill
{
   my $self = shift;
   my ( $signal ) = @_;

   kill $signal, $self->pid or croak "Cannot kill() - $!";
}

=head1 AUTHOR

Paul Evans <leonerd@leonerd.org.uk>

=cut

0x55AA;