recv_nonblock(*args) public

Receives up to maxlen bytes from socket using recvfrom(2) after O_NONBLOCK is set for the underlying file descriptor. flags is zero or more of the MSG_ options. The result, mesg, is the data received.

When recvfrom(2) returns 0, Socket#recv_nonblock returns an empty string as data. The meaning depends on the socket: EOF on TCP, empty packet on UDP, etc.

Parameters

  • maxlen - the number of bytes to receive from the socket

  • flags - zero or more of the MSG_ options

Example

serv = TCPServer.new("127.0.0.1", 0)
af, port, host, addr = serv.addr
c = TCPSocket.new(addr, port)
s = serv.accept
c.send "aaa", 0
IO.select([s]) # emulate blocking recv.
p s.recv_nonblock(10) #=> "aaa"

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

BasicSocket#recv_nonblock may raise any error corresponding to recvfrom(2) failure, including Errno::EWOULDBLOCK.

See

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