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#! perl -w
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# use strict; # eval doesn't work with use strict !?
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# see POD documentation at end
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rodolico |
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=head1 NAME
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uptime.pl - Uptime for Windows. Version 0.27.
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=cut
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$^O eq "MSWin32" || exit;
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my $max_results = 5; # if we have to use tick counts
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my $VERSION = 0.27;
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my $debug = $ENV{'QUERY_STRING'} || $ARGV[0];
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print "$0 version $VERSION\n" if $debug;
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print "Debug mode on\n" if $debug;
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print "Perl version $]\n" if $debug;
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BEGIN {
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# HTTP headers if needed
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local $^W = 0;
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print "$ENV{'SERVER_PROTOCOL'}/200 OK\n" if $ENV{'PERLXS'} eq "PerlIS";
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print "Content-type: text/plain\n\n" if $ENV{'SERVER_PROTOCOL'};
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}
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my ($several, @uptimes);
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if (Win32::IsWinNT()) {
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print "Windows NT\n\n" if $debug;
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push @uptimes, (&event_log || &tick_counts);
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print "eval error: $@\n" if $@ && $debug;
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}
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else {
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print "Windows 9x\n\n" if $debug;
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push @uptimes, (&system_da0 || &tick_counts);
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}
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sub tick_counts {
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print "Counting ticks\n" if $debug;
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my @ticks;
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my $ticks = Win32::GetTickCount() > 0
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? Win32::GetTickCount()
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: Win32::GetTickCount() + 2**32;
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my $seconds = $ticks/1000;
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for (1..$max_results-1) {
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push @ticks, time()-$seconds;
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$seconds += 2**32/1000;
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}
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return @ticks, time()-$seconds;
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}
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sub system_da0 {
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my $file = "$ENV{'WINDIR'}\\system.da0";
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print "Checking $file\n" if $debug;
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my $stat = (stat $file)[9];
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print "Could not stat $file ($!)\n" if $debug && !$stat;
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return $stat || undef;
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}
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sub event_log {
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my $result = eval '
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local $^W = 0;
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use Win32::EventLog;
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my ($EventLog, $first, $count, $event, %data);
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Win32::EventLog::Open($EventLog , "System", "") || die ("EventLog Open() failed");
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$EventLog->GetOldest($first) || die ("EventLog GetOldest() failed");
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$EventLog->GetNumber($count) || die ("EventLog GetNumber() failed");
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print "Event log first=$first, count=$count\n" if $debug;
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$EventLog->Read((EVENTLOG_SEEK_READ | EVENTLOG_BACKWARDS_READ),$first+$count,$event);
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for $i (0 .. $first+$count-1) {
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$EventLog->Read((EVENTLOG_SEQUENTIAL_READ|EVENTLOG_BACKWARDS_READ),0,$event)
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|| die ("EventLog Read() failed at event $i");
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%data = %{$event};
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$data{"EventID"} = $data{"EventID"} & 0xffff;
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next unless $data{"EventID"} == 6005;
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print "Found event 6005\n" if $debug;
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return $data{"TimeGenerated"};
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print "This script is broken: it should never reach this line\n";
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}
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return undef;
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';
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if ($@) {
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print "Eval error: $@\n";
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return undef;
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}
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else {
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return $result;
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}
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}
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$several = @uptimes - 1;
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foreach (@uptimes) {
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print "up ", &time2days($_), " (since ", scalar localtime($_), ")\n";
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print "or:\n" if $several;
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}
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print "... but who would believe that anyway?...\n" if $several;
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sub time2days {
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print "converting $_[0]\n" if $debug;
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my $days = (time() - $_[0])/(24*60*60);
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my $hours = ($days - int($days)) * 24;
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my $minutes = ($hours - int($hours)) * 60;
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my $day_st = $days >= 2 ? 'days' : 'day';
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return sprintf("%0d $day_st %02d:%02d", $days, $hours, $minutes);
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}
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__END__
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=head1 SYNOPSIS
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perl uptime.pl [debug]
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=head1 DESCRIPTION
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Report machine uptime on Windows systems.
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This script attempts to report the system uptime in a format similar
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to the Unix uptime command. It only reports uptime, not users or
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load statistics.
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On NT it uses the event log. The event log service itself writes an
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entry to it when it starts (ID 6005).
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On Win95 it gets the create time of the system.da0 file (the system.dat
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backup file which is recreated at system start).
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If eihter of these methods fail (like on Win98), it uses the system tick
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counts. Since these can only hold about 49.7 days, it returns a list of
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possible uptimes, limited to C<$max_results> (5 by default). (Have you ever
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seen a Windows system up for more than 200 days? ;-) If yes, set
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C<$max_results> to a higher value).
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The script can be used in CGI. It will print the needed headers automatically.
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The latest version should always be available at
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http://alma.ch/perl/scripts/uptime.pl
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=head1 OPTIONS
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If given any argument (at the command line or as a CGI argument), it is
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considered as a 'debug' or 'verbose' option, and additional stuff is printed.
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=head1 FEATURES (aka BUGS)
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On NT, the uptime will be wrong if you restarted the event log service.
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If you have a low limit on your event log file size or logged events, and
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your system has been up for a long time, the event may not be available
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anymore. The script will then use tick counts.
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On Win95, the uptime will be wrong if the create time of your system.da0 file
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is not the same as when your system booted. I don't see what could cause this
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unless you overwrite the file, but there may be special cases. Let me know if
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you find any.
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On Win98, there seems to be no way other than tick counts. Let me know if you
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find something better.
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=head1 SCRIPT CATEGORIES
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Win32
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=head1 OSNAMES
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MSWin32
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=head1 AUTHOR
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M. Ivkovic. email: C<perl -e "printf '%s@%s', 'mi.perl', 'alma.ch'">.
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Others welcome to extend it to more operating systems which don't have an uptime
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command.
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=head1 COPYRIGHT
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Copyright M. Ivkovic, 1999. Same license as Perl itself.
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=head1 README
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Attempt to report machine uptime on various Windows systems.
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=cut
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