用 perl 写一个 daemon 程序来处理 cgi 文件：

vi /usr/local/bin/cgiwrap-fcgi.pl
#!/usr/bin/perl -w
use FCGI;
use Socket;
use FCGI::ProcManager;
sub shutdown { FCGI::CloseSocket($socket); exit; }
sub restart { FCGI::CloseSocket($socket); &main; }
use sigtrap 'handler', \&shutdown, 'normal-signals';
use sigtrap 'handler', \&restart, 'HUP';
require 'syscall.ph';
use POSIX qw(setsid);

#&daemonize; we don't daemonize when running under runsv
#this keeps the program alive or something after exec'ing perl scripts
END() { }
BEGIN() { }
{
no warnings;
*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!!
#foreach $item (keys %ENV) { delete $ENV{$item}; }
$proc_manager = FCGI::ProcManager->new( {n_processes => 5} );
$socket = FCGI::OpenSocket( "127.0.0.1:8999", 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,
&FCGI::FAIL_ACCEPT_ON_INTR );
$proc_manager->pm_manage();
if ($request) { request_loop() }
FCGI::CloseSocket($socket);
}

sub request_loop {
while ( $request->Accept() >= 0 ) {
$proc_manager->pm_pre_dispatch();

#processing any STDIN input from WebServer (for CGI-POST actions)
$stdin_passthrough = '';
{ no warnings; $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 );
pipe( PARENT_ERR, CHILD_ERR );
my $pid = open( CHILD_O, "-|" );
unless ( defined($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;
}
$oldfh = select(PARENT_ERR);
$| = 1;
select(CHILD_O);
$| = 1;
select($oldfh);
if ( $pid > 0 ) {
close(CHILD_RD);
close(CHILD_ERR);
print PARENT_WR $stdin_passthrough;
close(PARENT_WR);
$rin = $rout = $ein = $eout = '';
vec( $rin, fileno(CHILD_O), 1 ) = 1;
vec( $rin, fileno(PARENT_ERR), 1 ) = 1;
$ein = $rin;
$nfound = 0;

while ( $nfound =
select( $rout = $rin, undef, $ein = $eout, 10 ) )
{
die "$!" unless $nfound != -1;
$r1 = vec( $rout, fileno(PARENT_ERR), 1 ) == 1;
$r2 = vec( $rout, fileno(CHILD_O), 1 ) == 1;
$e1 = vec( $eout, fileno(PARENT_ERR), 1 ) == 1;
$e2 = vec( $eout, fileno(CHILD_O), 1 ) == 1;

if ($r1) {
while ( $bytes = read( PARENT_ERR, $errbytes, 4096 ) ) {
print STDERR $errbytes;
}
if ($!) {
$err = $!;
die $!;
vec( $rin, fileno(PARENT_ERR), 1 ) = 0
unless ( $err == EINTR or $err == EAGAIN );
}
}
if ($r2) {
while ( $bytes = read( CHILD_O, $s, 4096 ) ) {
print $s;
}
if ( !defined($bytes) ) {
$err = $!;
die $!;
vec( $rin, fileno(CHILD_O), 1 ) = 0
unless ( $err == EINTR or $err == EAGAIN );
}
}
last if ( $e1 || $e2 );
}
close CHILD_RD;
close PARENT_ERR;
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(PARENT_ERR);
close(STDIN);
close(STDERR);

#fcntl(CHILD_RD, F_DUPFD, 0);
syscall( &SYS_dup2, fileno(CHILD_RD), 0 );
syscall( &SYS_dup2, fileno(CHILD_ERR), 2 );

#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";
}
}
}

注意文件中的这两行：
#$socket = FCGI::OpenSocket( "127.0.0.1:8999", 10 );
#$socket = FCGI::OpenSocket( "/var/run/nginx/perl_cgi-dispatch.sock", 10 );
这两行都表示监听来自 perl CGI 的请求。
其中 perl_cgi-dispatch.sock 表示使用 unix socket 响应 CGI 请求。
127.0.0.1:8999 表示使用 TCP/IP 协议响应请求。
需要使用哪种方式就在下面的 FCGI::OpenSocket 中填入相对应的内容。

启动：
chmod +x /usr/local/bin/cgiwrap-fcgi.pl
/usr/local/bin/cgiwrap-fcgi.pl > /dev/null 2>&1 &

配置 Nginx 的 location 处理 cgi 文件：
location ~ .*\.cgi$ {
fastcgi_pass 127.0.0.1:8999;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}

测试：
在 web 的根目录下创建一个 cgi 文件：
vi test.cgi
#!/usr/bin/perl
print "Content-type: text/html\n\n";
print "Hello, world.";

文件需要有可执行权限：
chmod +x test.cgi

访问 http://www.domain.com/test.cgi 看看有没有输出。

cgiwrap-fcgi.pl 随 nginx 一起启动/关闭：
修改 nginx 启动脚本：
在 start 段加入：
/usr/local/bin/cgiwrap-fcgi.pl > /dev/null 2>&1 &

在 stop 段加入：
PID=`/bin/netstat -npl | grep "127.0.0.1:8999" | awk '{print $7}' | cut -d "/" -f 1`
while [ -n "$PID" ]
do
kill -9 "$PID"
PID=`/bin/netstat -npl | grep "127.0.0.1:8999" | awk '{print $7}' | cut -d "/" -f 1`
done

在下面添加：
edButtons[edButtons.length] =
new edButton('ed_coolcode'
,'coolcode'
,''
,''
,'x'
);

再找到
t.Buttons[t.Buttons.length] = new edButton(name+'_code','code','','','c');

在下面添加一行：
t.Buttons[t.Buttons.length] = new edButton(name+'_coolcode','coolcode','','','x');

然后对 quicktags.js 做同样的修改。

CoolCode 的介绍： http://www.coolcode.cn/?action=show&id=26

function widget_mywidget($args) {
extract($args);
?>


My Widget

}
register_sidebar_widget('My Widget', 'widget_mywidget');
?>

register_sidebar_widget 注册函数之后，输出部件标题 "My Widget" 及內容 "My Widget"。
又从 WordPress Widgets 文档中知道：不能在插件导入之后执行任何代码，要使用 plugins_loaded 这个 hook，所以 add_action 的对象即是 plugins_loaded。

最后，在插件程序文件 mulberrykit.php 后增加了如下代码：

function widget_random_posts_init() {

if ( !function_exists('register_sidebar_widget') || !function_exists('register_widget_control') )
return;

function random_posts_sidebar_module($args) {
extract($args);

echo $before_widget . $before_title . $title . $after_title;
echo "

随机文章

";
random_posts();
echo "

";
echo $after_widget;
}

register_sidebar_widget('Random Posts module', 'random_posts_sidebar_module');
}

add_action('plugins_loaded', 'widget_random_posts_init');

在管理后台的 外观 -> Widgets 中就可以找到 Random Posts module 这个部件了。