Merge branch 'ta/sendfile/OTP-9240'

* ta/sendfile/OTP-9240: (31 commits)
  Add sendfile server printouts
  Skip recv/send during tests for fallback platforms
  Remove header/trailer support
  Remove windows implementation
  Expand sendfile documentation
  Only allow tcp sockets as target for sendfile
  Move sendfile api to file module
  Preliminary work on header/trailer
  Use free_sendfile explicitly for non-async
  Remove debug printouts
  Add tests for send/recv/sendfile interactions
  Remove tests for file_server sendfile
  sendfile caller now has to be the controlling_process
  Remove support for file_server, sendfile has to be raw
  Set chunk size to 3 GB
  Change type of fd to be ErlDrvEvent
  Add ifdef's for HAVE_SENDFILE
  Fix freebsd support for sendfile
  Change nbytes to 64 bit
  Implement ignorefd for TCP
  ...

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/kernel/src/inet.erl b/lib/kernel/src/inet.erl
index b60c68e3a1..49f64a9236 100644
--- a/lib/kernel/src/inet.erl
+++ b/lib/kernel/src/inet.erl
@@ -40,6 +40,10 @@
 
 -export([tcp_controlling_process/2, udp_controlling_process/2,
 	 tcp_close/1, udp_close/1]).
+
+%% used by sendfile
+-export([lock_socket/2]).
+
 %% used by socks5
 -export([setsockname/2, setpeername/2]).
 
@@ -1353,3 +1357,14 @@ stop_timer(Timer) ->
 	    end;
 	T -> T
     end.
+
+
+lock_socket(S,Val) ->
+    case erlang:port_info(S, connected) of
+	{connected, Pid} when Pid =/= self() ->
+	    {error, not_owner};
+	undefined ->
+	    {error, einval};
+	_ ->
+	    prim_inet:ignorefd(S,Val)
+    end.