socket: fix recvmsg without argument

* ext/socket/ancdata.c (bsock_recvmsg_internal): grow buffer
  on unspecified maxdatlen
  [ruby-core:71517] [Bug #11701]
* ext/socket/lib/socket.rb (Socket#recvmsg): nil default for dlen
  (Socket#recvmsg_nonblock): ditto
* test/socket/test_socket.rb (test_recvmsg_udp_no_arg): new test

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52625 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 16 insertions, 0 deletions

diff --git a/test/socket/test_socket.rb b/test/socket/test_socket.rb
index 26684622e2..bfa4a143bf 100644
--- a/test/socket/test_socket.rb
+++ b/test/socket/test_socket.rb
@@ -653,4 +653,20 @@ class TestSocket < Test::Unit::TestCase
     end
   end
 
+  def test_recvmsg_udp_no_arg
+    n = 4097
+    s1 = Addrinfo.udp("127.0.0.1", 0).bind
+    s2 = s1.connect_address.connect
+    s2.send("a" * n, 0)
+    ret = s1.recvmsg
+    assert_equal n, ret[0].bytesize, '[ruby-core:71517] [Bug #11701]'
+
+    s2.send("a" * n, 0)
+    IO.select([s1])
+    ret = s1.recvmsg_nonblock
+    assert_equal n, ret[0].bytesize, 'non-blocking should also grow'
+  ensure
+    s1.close
+    s2.close
+  end
 end if defined?(Socket)