accept_nonblock

/*
 * call-seq:
 *    socket.accept_nonblock => [client_socket, client_sockaddr]
 * 
 * Accepts an incoming connection using accept(2) after
 * O_NONBLOCK is set for the underlying file descriptor.
 * It returns an array containg the accpeted socket
 * for the incoming connection, _client_socket_,
 * and a string that contains the +struct+ sockaddr information
 * about the caller, _client_sockaddr_.
 * 
 * === Example
 *      # In one script, start this first
 *      require 'socket'
 *      include Socket::Constants
 *      socket = Socket.new(AF_INET, SOCK_STREAM, 0)
 *      sockaddr = Socket.sockaddr_in(2200, 'localhost')
 *      socket.bind(sockaddr)
 *      socket.listen(5)
 *      begin
 *        client_socket, client_sockaddr = socket.accept_nonblock
 *      rescue Errno::EAGAIN, Errno::EWOULDBLOCK, Errno::ECONNABORTED, Errno::EPROTO, Errno::EINTR
 *        IO.select([socket])
 *        retry
 *      end
 *      puts "The client said, '#{client_socket.readline.chomp}'"
 *      client_socket.puts "Hello from script one!"
 *      socket.close
 *
 *      # In another script, start this second
 *      require 'socket'
 *      include Socket::Constants
 *      socket = Socket.new(AF_INET, SOCK_STREAM, 0)
 *      sockaddr = Socket.sockaddr_in(2200, 'localhost')
 *      socket.connect(sockaddr)
 *      socket.puts "Hello from script 2." 
 *      puts "The server said, '#{socket.readline.chomp}'"
 *      socket.close
 * 
 * Refer to Socket#accept for the exceptions that may be thrown if the call
 * to _accept_nonblock_ fails. 
 *
 * Socket#accept_nonblock may raise any error corresponding to accept(2) failure,
 * including Errno::EAGAIN.
 * 
 * === See
 * * Socket#accept
 */
static VALUE
sock_accept_nonblock(sock)
    VALUE sock;
{
    rb_io_t *fptr;
    VALUE sock2;
    char buf[1024];
    socklen_t len = sizeof buf;

    GetOpenFile(sock, fptr);
    sock2 = s_accept_nonblock(rb_cSocket, fptr, (struct sockaddr *)buf, &len);
    return rb_assoc_new(sock2, rb_str_new(buf, len));
}