merge revision(s) 39239,45045,45530: [Backport #9697]

	* ext/socket: always operate length of socket addess companion with
	  socket address. 

	* ext/socket/rubysocket.h (rsock_make_ipaddr): add an argument for
	  socket address length.
	  (rsock_ipaddr): ditto.

	* ext/socket/ipsocket.c (ip_addr): pass length to rsock_ipaddr.
	  (ip_peeraddr): ditto.
	  (ip_s_getaddress): pass length to rsock_make_ipaddr.

	* ext/socket/socket.c (make_addrinfo): pass length to rsock_ipaddr.
	  (sock_s_getnameinfo): pass actual address length to rb_getnameinfo.
	  (sock_s_unpack_sockaddr_in): pass length to rsock_make_ipaddr.
	  

	* ext/socket/init.c (rsock_s_recvfrom): pass length to rsock_ipaddr.
	  (rsock_s_recvfrom_nonblock): ditto.

	* ext/socket/tcpsocket.c (tcp_sockaddr): pass length to
	  rsock_make_ipaddr.

	* ext/socket/raddrinfo.c (make_ipaddr0): add an argument for socket
	  address length.  pass the length to rb_getnameinfo.
	  (rsock_ipaddr): ditto.
	  (rsock_make_ipaddr): add an argument for socket address length. 
	  pass the length to make_ipaddr0.
	  (make_inetaddr): pass length to make_ipaddr0.
	  a local variable renamed.
	  (host_str): a local variable renamed.
	  (port_str): ditto.

	* ext/socket/ipsocket.c (ip_s_getaddress): Don't access freed memory.

	* ext/socket/socket.c (sock_s_getnameinfo): Save errno for EAI_SYSTEM.
	  Reported by Saravana kumar.  [ruby-core:61820] [Bug #9697]
	  Fixed by Heesob Park.  [ruby-core:61868]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@46510 b2dd03c8-39d4-4d8f-98ff-823fe69b080e