晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: Receives up to <em>maxlen</em> bytes from <tt>udpsocket</tt> using recvfrom(2) after O_NONBLOCK is set for the underlying file descriptor. <em>flags</em> is zero or more of the <tt>MSG_</tt> options. The first element of the results, <em>mesg</em>, is the data received. The second element, <em>sender_inet_addr</em>, is an array to represent the sender address.
- !ruby/struct:SM::Flow::P 
  body: When recvfrom(2) returns 0, Socket#recvfrom_nonblock returns an empty string as data. It means an empty packet.
- !ruby/struct:SM::Flow::H 
  level: 3
  text: Parameters
- !ruby/object:SM::Flow::LIST 
  contents: 
  - !ruby/struct:SM::Flow::LI 
    label: "*"
    body: <tt>maxlen</tt> - the number of bytes to receive from the socket
  - !ruby/struct:SM::Flow::LI 
    label: "*"
    body: <tt>flags</tt> - zero or more of the <tt>MSG_</tt> options
  type: :BULLET
- !ruby/struct:SM::Flow::H 
  level: 3
  text: Example
- !ruby/struct:SM::Flow::VERB 
  body: "     require 'socket'\n     s1 = UDPSocket.new\n     s1.bind(&quot;127.0.0.1&quot;, 0)\n     s2 = UDPSocket.new\n     s2.bind(&quot;127.0.0.1&quot;, 0)\n     s2.connect(*s1.addr.values_at(3,1))\n     s1.connect(*s2.addr.values_at(3,1))\n     s1.send &quot;aaa&quot;, 0\n     IO.select([s2])\n     p s2.recvfrom_nonblock(10)  #=&gt; [&quot;aaa&quot;, [&quot;AF_INET&quot;, 33302, &quot;localhost.localdomain&quot;, &quot;127.0.0.1&quot;]]\n"
- !ruby/struct:SM::Flow::P 
  body: Refer to Socket#recvfrom for the exceptions that may be thrown if the call to <em>recvfrom_nonblock</em> fails.
- !ruby/struct:SM::Flow::P 
  body: UDPSocket#recvfrom_nonblock may raise any error corresponding to recvfrom(2) failure, including Errno::EAGAIN.
- !ruby/struct:SM::Flow::H 
  level: 3
  text: See
- !ruby/object:SM::Flow::LIST 
  contents: 
  - !ruby/struct:SM::Flow::LI 
    label: "*"
    body: Socket#recvfrom
  type: :BULLET
full_name: UDPSocket#recvfrom_nonblock
is_singleton: false
name: recvfrom_nonblock
params: |
  udpsocket.recvfrom_nonblock(maxlen) => [mesg, sender_inet_addr]
  udpsocket.recvfrom_nonblock(maxlen, flags) => [mesg, sender_inet_addr]

visibility: public