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#!/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/\#.*//g;
$line =~ s/\s+$//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{
`rm -f $localpid`;
}
}
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) {
exit(0);
}
exec "$memcached $params";
exit(0);
}else{
if(open PIDHANDLE,">$pidfile")
{
print PIDHANDLE $pid;
close PIDHANDLE;
}else{
print STDERR "Can't write pidfile to $pidfile.\n";
}
}
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