如何配置Eclipse / PyDev以正确地允许对命令行工具的引用？

Question

我正在尝试调试Eclipse / PyDev中的python脚本，但是当我从开发环境中运行时，我似乎无法让脚本正确执行。

似乎Eclipse / PyDev环境限制了对正在调试的程序的命令行工具的访问。

如何解决此限制？有没有办法在Eclipse项目中添加对相关命令行工具的引用？

已更新：

这是尝试运行外部应用程序的代码块。问题可能与那里的子线程有关吗？

def call_command_in_dir_unix(app, args, targetdir):
    # this is the unix implementation
    (r,w) = os.pipe()
    pid = os.fork()
    if pid == -1:
      return 'could not fork'
    if pid == 0:
      # child
      print "child!"
      os.close(r)
      os.dup2(os.open("/dev/null", os.O_WRONLY), 0)
      os.dup2(w, 1)
      os.dup2(w, 2)
      os.chdir(targetdir)
      os.environ['openin_any'] = 'p'
      os.environ['openout_any'] = 'p'
      os.environ['shell_escape'] = 'f'
      import resource
      resource.setrlimit(resource.RLIMIT_CPU,
                         (MAX_RUN_TIME * 1000, MAX_RUN_TIME * 1000)) # docs say this is seconds, but it is msecs on my system.
      # os.execvp will raise an exception if the executable isn't
      # present. [[ try os.execvp("aoeu", ['aoeu'])  ]]
      # If we don't catch exceptions here, it will be caught at the
      # main body below, and then os.rmdir(tmpdir) will be called
      # twice, once for each fork.  The second one raises an exception
      # in the main code, which gets back to the user.  This is bad.
      try:
        os.execvp(app, [app] + list(args))
      finally:
        print "failed to exec()",app
        os._exit(2)
    else:
      # parent
      os.close(w)
      r = os.fdopen(r,"r")
      output = ''.join(r.readlines())
      (npid, exi) = os.waitpid(pid, 0)
      r.close()
      sig = exi & 0xFF
      stat = exi >> 8
      if stat != 0 or sig != 0:
        return ' error! exitcode was %d (signal %d), transscript follows:\n\n%s' % (stat,sig,output)
      return None
    # notreached