merge revision(s) 35474,35479,38939,38943,38963,38991,38994: [Backport #7786]

* ext/socket/raddrinfo.c (init_unix_addrinfo): support the longest
	  path in sockaddr_un.
	  (inspect_sockaddr): ditto.
	  (addrinfo_mdump): ditto.
	  (addrinfo_mload): ditto.
	  (rsock_unixpath_str): new function.
	  (rsock_unixpath): removed.
	  (rsock_unixaddr): use rsock_unixpath_str.

	* ext/socket/socket.c (sock_s_pack_sockaddr_un): support the longest
	  path in sockaddr_un.
	  (sock_s_unpack_sockaddr_un): ditto.
	  (sock_s_gethostbyaddr): unused variable removed.

	* ext/socket/unixsocket.c (rsock_init_unixsock): support the longest
	  path in sockaddr_un.

	* ext/socket/rubysocket.h (rsock_unixpath_str): declared.
	  (rsock_unixpath): removed.

	* test/socket/test_unix.rb: comment out test_nul because abstract unix
	  sockets may contain NULs.

	* ext/socket/socket.c (sock_s_pack_sockaddr_un): support the longest
	  path in sockaddr_un, really.
	  reported by nagachika.
	  http://d.hatena.ne.jp/nagachika/20120426/ruby_trunk_changes_35474_35476

	* ext/socket/raddrinfo.c (rsock_unixpath_len, init_unix_addrinfo),
	  ext/socket/unixsocket.c (unixsock_connect_internal,
	  rsock_init_unixsock): calculate the correct address length of
	  an abstract socket.  Without this fix, sizeof(struct sockaddr_un)
	  is specified as the length of an abstract socket for bind(2) or
	  connect(2), so the address of the socket is filled with extra NUL
	  characters.  See unix(7) for details.

	* ext/socket/lib/socket.rb (unix_server_socket): don't access the
	  file system if the platform is Linux and path starts with NUL,
	  which means that the socket is an abstract socket.

	* test/socket/test_unix.rb: related test.

	* ext/socket/raddrinfo (rsock_unix_sockaddr_len): renamed from
	  rsock_unixpath_len, because it returns not the length of the path,
	  but the length of a socket address for the path.

	* ext/socket/socket.c (sock_s_pack_sockaddr_un): calculate the
	  correct address length of an abstract socket.

	* test/socket/test_unix.rb: related test.

	* ext/socket/unixsocket.c (rsock_init_unixsock): use rb_inspect()
	  because rb_sys_fail_str() fails if its argument contains NUL.

	* test/socket/test_unix.rb: related test.

	* ext/socket/raddrinfo.c (rsock_unix_sockaddr_len): return
	  sizeof(sa_familiy_t) if path is empty.  see "Autobind Feature" in
	  unix(7) for details.

	* ext/socket/lib/socket.rb (unix_socket_abstract_name?): treat an
	  empty path as an abstract name.

	* test/socket/test_unix.rb: related test.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@39096 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/socket/test_unix.rb

@@ -324,8 +324,11 @@ class TestSocket_UNIXSocket < Test::Unit::TestCase
     assert_raise(ArgumentError) { UNIXServer.new("a" * 300) }
   end
 
-  def test_nul
-    assert_raise(ArgumentError) { Socket.sockaddr_un("a\0b") }
+  def test_abstract_namespace
+    return if /linux/ !~ RUBY_PLATFORM
+    addr = Socket.pack_sockaddr_un("\0foo")
+    assert_match(/\0foo\z/, addr)
+    assert_equal("\0foo", Socket.unpack_sockaddr_un(addr))
   end
 
   def test_dgram_pair
@@ -507,4 +510,69 @@ class TestSocket_UNIXSocket < Test::Unit::TestCase
     }
   end
 
+  def test_abstract_unix_server
+    return if /linux/ !~ RUBY_PLATFORM
+    name = "\0ruby-test_unix"
+    s0 = nil
+    UNIXServer.open(name) {|s|
+      assert_equal(name, s.local_address.unix_path)
+      s0 = s
+      UNIXSocket.open(name) {|c|
+        sock = s.accept
+        begin
+          assert_equal(name, c.remote_address.unix_path)
+        ensure
+          sock.close
+        end
+      }
+    }
+    assert(s0.closed?)
+  end
+
+  def test_abstract_unix_socket_econnrefused
+    return if /linux/ !~ RUBY_PLATFORM
+    name = "\0ruby-test_unix"
+    assert_raise(Errno::ECONNREFUSED) do
+      UNIXSocket.open(name) {}
+    end
+  end
+
+  def test_abstract_unix_server_socket
+    return if /linux/ !~ RUBY_PLATFORM
+    name = "\0ruby-test_unix"
+    s0 = nil
+    Socket.unix_server_socket(name) {|s|
+      assert_equal(name, s.local_address.unix_path)
+      s0 = s
+      Socket.unix(name) {|c|
+        sock, = s.accept
+        begin
+          assert_equal(name, c.remote_address.unix_path)
+        ensure
+          sock.close
+        end
+      }
+    }
+    assert(s0.closed?)
+  end
+
+  def test_autobind
+    return if /linux/ !~ RUBY_PLATFORM
+    s0 = nil
+    Socket.unix_server_socket("") {|s|
+      name = s.local_address.unix_path
+      assert_match(/\A\0[0-9a-f]{5}\z/, name)
+      s0 = s
+      Socket.unix(name) {|c|
+        sock, = s.accept
+        begin
+          assert_equal(name, c.remote_address.unix_path)
+        ensure
+          sock.close
+        end
+      }
+    }
+    assert(s0.closed?)
+  end
+
 end if defined?(UNIXSocket) && /cygwin/ !~ RUBY_PLATFORM