Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
43 lines (35 sloc) 1.29 KB
#!/usr/bin/perl -s
#
# solo v1.7
# Prevents multiple cron instances from running simultaneously.
#
# Copyright 2007-2016 Timothy Kay
# http://timkay.com/solo/
#
# It is free software; you can redistribute it and/or modify it under the terms of either:
#
# a) the GNU General Public License as published by the Free Software Foundation;
# either version 1 (http://dev.perl.org/licenses/gpl1.html), or (at your option)
# any later version (http://www.fsf.org/licenses/licenses.html#GNUGPL), or
#
# b) the "Artistic License" (http://dev.perl.org/licenses/artistic.html), or
#
# c) the MIT License (http://opensource.org/licenses/MIT)
#
use Socket;
alarm $timeout if $timeout;
$port =~ /^\d+$/ or $noport or die "Usage: $0 -port=PORT COMMAND\n";
if ($port)
{
# To work with OpenBSD: change to
# $addr = pack(CnC, 127, 0, 1);
# but make sure to use different ports across different users.
# (Thanks to www.gotati.com .)
$addr = pack(CnC, 127, $<, 1);
print "solo: bind ", join(".", unpack(C4, $addr)), ":$port\n" if $verbose;
$^F = 10; # unset close-on-exec
socket(SOLO, PF_INET, SOCK_STREAM, getprotobyname('tcp')) or die "socket: $!";
bind(SOLO, sockaddr_in($port, $addr)) or $silent? exit: die "solo($port): $!\n";
}
sleep $sleep if $sleep;
exec @ARGV;
You can’t perform that action at this time.