Current File : //opt/alt/ruby18/share/ri/1.8/system/Socket/recvfrom_nonblock-i.yaml
--- !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 "I only received 20 bytes '#{data}'"\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 "Watch this get cut short!"\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
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