* ext/socket/socket.c (s_recvfrom): alen may be zero with UNIXSocket

  too.  (tested on NetBSD 3.0)
  (s_recvfrom_nonblock): extracted from sock_recvfrom_nonblock.
  (sock_recvfrom_nonblock): use s_recvfrom_nonblock.
  (ip_recvfrom_nonblock): new method: IPSocket#recvfrom_nonblock
  (unix_recvfrom_nonblock): new method: UNIXSocket#recvfrom_nonblock
  (s_accept_nonblock): extracted from sock_accept_nonblock.
  (sock_accept_nonblock): use s_accept_nonblock.
  (tcp_accept_nonblock): new method: TCPServer#accept_nonblock
  (unix_accept_nonblock): new method: UNIXServer#accept_nonblock


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@10205 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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