======Simple CGI======
  * 複製fastcgi-wrapper.pl到/usr/local/bin
  * fastcgi-wrapper.pl<code>#!/usr/bin/perl

use FCGI;
#perl -MCPAN -e 'install FCGI'
use Socket;
use POSIX qw(setsid);
#use Fcntl;

require 'syscall.ph';

&daemonize;

#this keeps the program alive or something after exec'ing perl scripts
END() { } BEGIN() { }
*CORE::GLOBAL::exit = sub { die "fakeexit\nrc=".shift()."\n"; }; 
eval q{exit}; 
if ($@) { 
	exit unless $@ =~ /^fakeexit/; 
};

&main;

sub daemonize() {
    chdir '/'                 or die "Can't chdir to /: $!";
    defined(my $pid = fork)   or die "Can't fork: $!";
    exit if $pid;
    setsid                    or die "Can't start a new session: $!";
    umask 0;
}

sub main {
        $socket = FCGI::OpenSocket( "127.0.0.1:8999", 10 ); #use IP sockets
        #$socket = FCGI::OpenSocket( "/var/run/nginx/perl_cgi-dispatch.sock", 10 ); #use UNIX sockets - user running this script must have w access to the 'nginx' folder!!
        $request = FCGI::Request( \*STDIN, \*STDOUT, \*STDERR, \%req_params, $socket );
        if ($request) { request_loop()};
            FCGI::CloseSocket( $socket );
}

sub request_loop {
        while( $request->Accept() >= 0 ) {
            
           #processing any STDIN input from WebServer (for CGI-POST actions)
           $stdin_passthrough ='';
           $req_len = 0 + $req_params{'CONTENT_LENGTH'};
           if (($req_params{'REQUEST_METHOD'} eq 'POST') && ($req_len != 0) ){ 
                my $bytes_read = 0;
                while ($bytes_read < $req_len) {
                        my $data = '';
                        my $bytes = read(STDIN, $data, ($req_len - $bytes_read));
                        last if ($bytes == 0 || !defined($bytes));
                        $stdin_passthrough .= $data;
                        $bytes_read += $bytes;
                }
            }

            #running the cgi app
            if ( (-x $req_params{SCRIPT_FILENAME}) &&  #can I execute this?
                 (-s $req_params{SCRIPT_FILENAME}) &&  #Is this file empty?
                 (-r $req_params{SCRIPT_FILENAME})     #can I read this file?
            ){
		pipe(CHILD_RD, PARENT_WR);
		my $pid = open(KID_TO_READ, "-|");
		unless(defined($pid)) {
			print("Content-type: text/plain\r\n\r\n");
                        print "Error: CGI app returned no output - Executing $req_params{SCRIPT_FILENAME} failed !\n";
			next;
		}
		if ($pid > 0) {
			close(CHILD_RD);
			print PARENT_WR $stdin_passthrough;
			close(PARENT_WR);

			while(my $s = <KID_TO_READ>) { print $s; }
			close KID_TO_READ;
			waitpid($pid, 0);
		} else {
	                foreach $key ( keys %req_params){
        	           $ENV{$key} = $req_params{$key};
                	}
        	        # cd to the script's local directory
	                if ($req_params{SCRIPT_FILENAME} =~ /^(.*)\/[^\/]+$/) {
                        	chdir $1;
                	}

			close(PARENT_WR);
			close(STDIN);
			#fcntl(CHILD_RD, F_DUPFD, 0);
			syscall(&SYS_dup2, fileno(CHILD_RD), 0);
			#open(STDIN, "<&CHILD_RD");
			exec($req_params{SCRIPT_FILENAME});
			die("exec failed");
		}
            } 
            else {
                print("Content-type: text/plain\r\n\r\n");
                print "Error: No such CGI app - $req_params{SCRIPT_FILENAME} may not exist or is not executable by this process.\n";
            }

        }
}
</code>
  * 複製啟動檔cgiwarp.sh到/etc/init.d/
  * cgiwarp.sh<code>#! /bin/sh

### BEGIN INIT INFO
# Provides: perl-cgiwrap
# Required-Start: $remote_fs $network
# Required-Stop: $remote_fs $network
# chkconfig: 2345 10 90
# Short-Description: starts cgiwrap-fcgi.pl
# Description: starts the Perl FastCGI Process daemon
### END INIT INFO


#PID=`pidof -x  /usr/local/bin/cgiwrap-fcgi.pl`
PID=`pidof -x  perl`

case "$1" in
start)
if ( test $PID ); then
echo "/usr/local/bin/fastcgi-wrapper.pl is already running"
else
echo "Starting cgiwrap "
/usr/bin/perl /usr/local/bin/fastcgi-wrapper.pl
fi
;;

stop)
if ( test $PID ); then
echo "Gracefully shutting down cgiwrap "
#kill $(pidof -x /usr/local/bin/cgiwrap-fcgi.pl)
kill ${PID};
else
echo "/usr/local/bin/fastcgi-wrapper.pl is not running"
fi
;;

restart)
if ( test $PID ); then
echo "Gracefully shutting down cgiwrap "
kill ${PID};
fi
sleep 2
echo "Restarting /usr/local/bin/fastcgi-wrapper.pl"
/usr/bin/perl /usr/local/bin/fastcgi-wrapper.pl
;;

status)
if ( test $PID ); then
ps -F -p ${PID};
else
echo "/usr/local/bin/fastcgi-wrapper.pl is not running"
fi
;;

*)
echo "Usage: $0 {start|stop|restart|status}"
exit 1
;;

esac</code>
  * 啟動<code>/etc/init.d/cgiwarp.sh start</code>
  * 啟動過程,可能未安裝CPANEL modules而導致失敗,例如要安裝FCGI CPANEL模組<code>#perl -MCPAN -e shell
cpan> instal FCGI
</code>
======參考資料======
  * [[http://wiki.nginx.org/SimpleCGI|Nginx官網-SimpleCGI]]