Linux下如何用Nginx作Perl程序服务器及其中Perl模块

#!/usr/bin/perl
 
use fcgi;
use socket;
use posix qw(setsid);
 
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
  $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 - ";
      print "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 ";
    print "exist or is not executable by this process.\n";
   }
 
  }
}