#!/usr/bin/perl -w

# start-memcached

# 2003/2004 - Jay Bonci <jaybonci@debian.org>

# This script handles the parsing of the /etc/memcached.conf file

# and was originally created for the Debian distribution.

# Anyone may use this little script under the same terms as

# memcached itself.

use POSIX qw(setsid);

use strict;

if($> != 0 and $< != 0)

{

    print STDERR "Only root wants to run start-memcached.\n";

    exit;

}

my $params; my $etchandle; my $etcfile = "/etc/memcached.conf";

# This script assumes that memcached is located at /usr/bin/memcached, and

# that the pidfile is writable at /var/run/memcached.pid

my $memcached = "/usr/bin/memcached";

my $pidfile = "/var/run/memcached.pid";

if (scalar(@ARGV) == 2) {

    $etcfile = shift(@ARGV);

    $pidfile = shift(@ARGV);

}

# If we don't get a valid logfile parameter in the /etc/memcached.conf file,

# we'll just throw away all of our in-daemon output. We need to re-tie it so

# that non-bash shells will not hang on logout. Thanks to Michael Renner for

# the tip

my $fd_reopened = "/dev/null";

sub handle_logfile

{

    my ($logfile) = @_;

    $fd_reopened = $logfile;

}

sub reopen_logfile

{

    my ($logfile) = @_;

    open *STDERR, ">>$logfile";

    open *STDOUT, ">>$logfile";

    open *STDIN, ">>/dev/null";

    $fd_reopened = $logfile;

}

# This is set up in place here to support other non -[a-z] directives

my $conf_directives = {

    "logfile" => \&handle_logfile,

};

if(open $etchandle, $etcfile)

{

    foreach my $line (<$etchandle>)

    {

        $line ||= "";

        $line =~ s/(?

        $line =~ s/\s+$//g;

        $line =~ s/^\s+//g;

        next unless $line;

        next if $line =~ /^\-[dh]/;

        if($line =~ /^[^\-]/)

        {

            my ($directive, $arg) = $line =~ /^(.*?)\s+(.*)/;

            $conf_directives->{$directive}->($arg);

            next;

        }

        push @$params, $line;

    }

}else{

    $params = [];

}

push @$params, "-u root" unless(grep "-u", @$params);

$params = join " ", @$params;

if(-e $pidfile)

{

    open PIDHANDLE, "$pidfile";

    my $localpid = <PIDHANDLE>;

    close PIDHANDLE;

    chomp $localpid;

    if(-d "/proc/$localpid")

    {

        print STDERR "memcached is already running.\n";

        exit;

    }else{

        unlink $pidfile;

    }

}

my $pid = fork();

if($pid == 0)

{

    # setsid makes us the session leader

    setsid();

    reopen_logfile($fd_reopened);

    # must fork again now that tty is closed

    $pid = fork();

    if ($pid) {

      if(open PIDHANDLE,">$pidfile")

      {

          print PIDHANDLE $pid;

          close PIDHANDLE;

      }else{

          print STDERR "Can't write pidfile to $pidfile.\n";

      }

      exit(0);

    }

    exec "$memcached $params";

    exit(0);

}