recv(*args) public

Receives a message.

maxlen is the maximum number of bytes to receive.

flags should be a bitwise OR of Socket::MSG_* constants.

UNIXSocket.pair {|s1, s2|
  s1.puts "Hello World"
  p s2.recv(4)                     #=> "Hell"
  p s2.recv(4, Socket::MSG_PEEK)   #=> "o Wo"
  p s2.recv(4)                     #=> "o Wo"
  p s2.recv(10)                    #=> "rld\n"
}
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