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package Watchdog::Process; |
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use strict; |
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use Alias; |
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use Proc::ProcessTable; |
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use base qw(Watchdog::Base); |
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use vars qw($NAME $PSTRING $HOST $PORT); |
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=head1 NAME |
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Watchdog::Process - Check for process in process table |
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=head1 SYNOPSIS |
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use Watchdog::Process; |
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$s = new Watchdog::Process($name,$pstring); |
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print $s->id, $s->is_alive ? ' is alive' : ' is dead', "\n"; |
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=head1 DESCRIPTION |
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B is an extension for monitoring processes running |
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on a Unix host. The class provides a trivial method for determining |
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whether a service is alive. I
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tested on Solaris 2.6>. |
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=cut |
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my %fields = ( PSTRING => undef, ); |
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=head1 CLASS METHODS |
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=head2 new($name,$pstring) |
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Returns a new B object. I<$name> is a string which |
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will identify the service to a human. I<$pstring> is a string which |
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can be used to identify a process in the process table. |
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=cut |
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sub new($$) { |
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my $DEBUG = 0; |
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my $proto = shift; |
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my $class = ref($proto) || $proto; |
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my $self = bless($class->SUPER::new(shift,undef,undef),$class); |
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for my $element (keys %fields) { |
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$self->{_PERMITTED}->{$element} = $fields{$element}; |
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} |
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@{$self}{keys %fields} = values %fields; |
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$self->{PSTRING} = shift; |
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return $self; |
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} |
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#------------------------------------------------------------------------------ |
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=head2 is_alive() |
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Returns true if the service is alive, else false. |
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=cut |
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sub is_alive() { |
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my $DEBUG = 0; |
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my $self = attr shift; |
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my $t = new Proc::ProcessTable; |
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for ( @{$t->table} ) { |
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# Proc::ProcessTable::Process::cmndline() seems to return |
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# undefined sometimes. Bug reported to author. |
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my $cmndline = $_->cmndline; |
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print STDERR "\$cmndline = $cmndline\n" if $DEBUG; |
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return 1 if defined($cmndline) && $cmndline =~ /$PSTRING/; |
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} |
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return 0; |
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} |
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#------------------------------------------------------------------------------ |
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=head1 BUGS |
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This class is I on Linux as |
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B sometimes returns undef. |
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=head1 SEE ALSO |
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L |
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=head1 AUTHOR |
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Paul Sharpe Epaul@miraclefish.comE |
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=head1 COPYRIGHT |
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Copyright (c) 1998 Paul Sharpe. England. All rights reserved. This |
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program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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=cut |