使用 Timeout::timeout(n) 缩短套接字超时似乎对我不起作用 [英] Shortening socket timeout using Timeout::timeout(n) does not seem to work for me

问题描述

我在 https://stackoverflow.com/questions/517219?tab=oldest#tab-top 但是，它对我不起作用.

I found what I thought should work perfectly at https://stackoverflow.com/questions/517219?tab=oldest#tab-top but, it did not work for me.

我在 Windows 上安装了 Ruby 1.9.1，当我尝试示例is_port_open"测试时，它不起作用.无论我为超时设置什么值，套接字调用仍然需要大约 20 秒才能超时.任何想法为什么?

I have Ruby 1.9.1 installed on Windows and, when I try the example "is_port_open" test, it does not work. The socket call still takes around 20 seconds to timeout no matter what value I set for the timeout. Any ideas why?

推荐答案

以下代码似乎适用于 Windows 上的 ruby​​ 1.9.1:

The following code seems to work with ruby 1.9.1 on Windows:

require 'socket'

def is_port_open?(ip, port)
  s = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
  sa = Socket.sockaddr_in(port, ip)

  begin
    s.connect_nonblock(sa)
  rescue Errno::EINPROGRESS
    if IO.select(nil, [s], nil, 1)
      begin
        s.connect_nonblock(sa)
      rescue Errno::EISCONN
        return true
      rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
        return false
      end
    end
  end

  return false
end

我还没有弄清楚为什么原来的 is_port_open?() 代码不能在带有 ruby​​ 1.9.1 的 Windows 上运行(它可以在其他操作系统上运行).

I haven't figured out yet why the original is_port_open?() code doesn't work on Windows with ruby 1.9.1 (it works on other OSes).

这篇关于使用 Timeout::timeout(n) 缩短套接字超时似乎对我不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！