Receives up to maxlen bytes from udpsocket using recvfrom(2) after O_NONBLOCK is set for the underlying file descriptor. flags is zero or more of the MSG_ options. The first element of the results, mesg, is the data received. The second element, sender_inet_addr, is an array to represent the sender address.

When recvfrom(2) returns 0, Socket#recvfrom_nonblock returns an empty string as data. It means an empty packet.

Parameters

• maxlen - the number of bytes to receive from the socket
• flags - zero or more of the MSG_ options

Example

     require 'socket'
     s1 = UDPSocket.new
     s1.bind("127.0.0.1", 0)
     s2 = UDPSocket.new
     s2.bind("127.0.0.1", 0)
     s2.connect(*s1.addr.values_at(3,1))
     s1.connect(*s2.addr.values_at(3,1))
     s1.send "aaa", 0
     IO.select([s2])
     p s2.recvfrom_nonblock(10)  #=> ["aaa", ["AF_INET", 33302, "localhost.localdomain", "127.0.0.1"]]

Refer to Socket#recvfrom for the exceptions that may be thrown if the call to recvfrom_nonblock fails.

UDPSocket#recvfrom_nonblock may raise any error corresponding to recvfrom(2) failure, including Errno::EAGAIN.

See

• Socket#recvfrom