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

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: Receives up to <em>maxlen</em> bytes from <tt>socket</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_sockaddr</em>, contains protocol-specific information on the sender.
- !ruby/struct:SM::Flow::P 
  body: "When recvfrom(2) returns 0, Socket#recvfrom_nonblock returns an empty string as data. The meaning depends on the socket: EOF on TCP, empty packet on UDP, etc."
- !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: "     # In one file, start this first\n     require 'socket'\n     include Socket::Constants\n     socket = Socket.new(AF_INET, SOCK_STREAM, 0)\n     sockaddr = Socket.sockaddr_in(2200, 'localhost')\n     socket.bind(sockaddr)\n     socket.listen(5)\n     client, client_sockaddr = socket.accept\n     begin\n       pair = client.recvfrom_nonblock(20)\n     rescue Errno::EAGAIN, Errno::EWOULDBLOCK\n       IO.select([client])\n       retry\n     end\n     data = pair[0].chomp\n     puts &quot;I only received 20 bytes '#{data}'&quot;\n     sleep 1\n     socket.close\n\n     # In another file, start this second\n     require 'socket'\n     include Socket::Constants\n     socket = Socket.new(AF_INET, SOCK_STREAM, 0)\n     sockaddr = Socket.sockaddr_in(2200, 'localhost')\n     socket.connect(sockaddr)\n     socket.puts &quot;Watch this get cut short!&quot;\n     socket.close\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: Socket#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: Socket#recvfrom_nonblock
is_singleton: false
name: recvfrom_nonblock
params: |
  socket.recvfrom_nonblock(maxlen) => [mesg, sender_sockaddr]
  socket.recvfrom_nonblock(maxlen, flags) => [mesg, sender_sockaddr]

visibility: public