recv_nonblock

/*
 * call-seq:
 *      basicsocket.recv_nonblock(maxlen) => mesg
 *      basicsocket.recv_nonblock(maxlen, flags) => mesg
 * 
 * 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])
 *      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::EAGAIN.
 *
 * === See
 * * Socket#recvfrom
 */

static VALUE
bsock_recv_nonblock(argc, argv, sock)
    int argc;
    VALUE *argv;
    VALUE sock;
{
    return s_recvfrom_nonblock(sock, argc, argv, RECV_RECV);
}