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timeout
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#!/usr/bin/env perl
=head1 NAME
timeout - Run a command and kill it after the given period.
=cut
=head1 SYNOPSIS
General Options:
--timeout Specify the maximum execution time.
--help Show the help information for this script.
--verbose Show useful debugging information.
=cut
=head1 ABOUT
This command will allow you to run a subcommand and terminate
that after the given time.
You may specify the timeout period in either seconds, minutes and
seconds, or hours, minutes and seconds. For example:
=for example begin
# kill after 32 seconds
timeout -t 32 top
# kill after two minutes, five seconds
timeout -t 2:5 top
# kill after six hour, five minutes, and two seconds.
timeout -t 6:5:2 top
=for example end
The timeout period is mandatory and has no default.
=cut
=head1 AUTHOR
Steve
--
http://www.steve.org.uk/
=cut
=head1 LICENSE
Copyright (c) 2013 by Steve Kemp. All rights reserved.
This script is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
The LICENSE file contains the full text of the license.
=cut
use strict;
use warnings;
use Getopt::Long;
use Pod::Usage;
#
# Get the options, either defaults or from the command line.
#
my %config = parsedOptions();
#
# Ensure we have a timeotut
#
if ( !$config{ 'timeout' } )
{
print "Please specify a timeout.\n";
exit(2);
}
#
# If we're being verbose..
#
if ( $config{ 'verbose' } )
{
print "Running command: " . join( " ", @ARGV ) . "\n";
print "Max executiong time " . $config{ 'timeout' } . " seconds\n";
}
#
# Call the command we were given, with our timeout.
#
timed_system( $config{ 'timeout' }, @ARGV );
#
# All done.
#
exit(0);
sub timed_system
{
my $time = shift;
my $pid;
local $SIG{ ALRM } = sub {
kill 15, $pid or die "kill: $!";
die "Timeout!";
}; # Just SIGTERM.
eval {
$pid = fork;
die "Fork failed: $!" unless defined $pid;
unless ($pid)
{
exec @_;
die "Exec failed: $!";
}
alarm $time;
waitpid $pid => 0;
};
die $@ if $@ && $@ !~ /^Timeout!/;
}
=begin doc
Parse the command line options (minimal!)
=end doc
=cut
sub parsedOptions
{
my %vars;
exit
if (
!GetOptions( "help" => \$vars{ 'help' },
"timeout=s" => \$vars{ 'timeout' },
"verbose" => \$vars{ 'verbose' } ) );
pod2usage(1) if ( $vars{ 'help' } );
if ( !$vars{ 'timeout' } )
{
print "Please specify a timeout\n";
exit(2);
}
#
# HH:MM:SS
#
if ( $vars{ 'timeout' } =~ /^([0-9]+):([0-9]+):([0-9]+)$/ )
{
my $sec = $3 + ( 60 * $2 ) + ( 60 * 60 * $1 );
$vars{ 'timeout' } = $sec;
}
elsif ( $vars{ 'timeout' } =~ /^([0-9]+):([0-9]+)$/ )
{
#
# MM:SS
#
my $sec = $2 + ( 60 * $1 );
$vars{ 'timeout' } = $sec;
}
elsif ( $vars{ 'timeout' } =~ /^([0-9]+)$/ )
{
#
# SS
#
}
else
{
print "Invalid timeout specification\n";
exit(2);
}
return (%vars);
}