<?php

$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("pipe", "w")   // stderr is a file to write to
);

$newenv = $_ENV;
$newenv["SCRIPT_FILENAME"] = $_ENV["X_SCRIPT_FILENAME"];
$newenv["SCRIPT_NAME"] = $_ENV["X_SCRIPT_NAME"];

if (is_executable($_ENV["X_SCRIPT_FILENAME"])) {
  $process = proc_open($_ENV["X_SCRIPT_FILENAME"], $descriptorspec, $pipes, NULL, $newenv);
  if (is_resource($process)) {
    fclose($pipes[0]);
    $head = fgets($pipes[1]);
    while (strcmp($head, "\n")) {
      header($head);
      $head = fgets($pipes[1]);
    }
    fpassthru($pipes[1]);
    fclose($pipes[1]);
    fclose($pipes[2]);
    $return_value = proc_close($process);
  }
  else {
    header("Status: 500 Internal Server Error");
    echo("Internal Server Error");
  }
}
else {
  header("Status: 404 Page Not Found");
  echo("Page Not Found");
}
?>