From 5ba916ef7ac71bd1e7e23b4c87ae6a472f14fd6c Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang-solutions.com>
Date: Fri, 25 Nov 2011 12:03:58 +0100
Subject: Create erlang fallback for sendfile

Created erlang fallback for sendfile in gen_tcp and
moved sendfile from file to gen_tcp. Also created testcases
for testing all different options to sendfile.

For info about how sendfile should work see the BSD man pages
as they contain a more complete API than other *nixes.
---
 erts/preloaded/src/prim_file.erl | 40 ++++++++++++++++++++++++++++++++++------
 1 file changed, 34 insertions(+), 6 deletions(-)

(limited to 'erts/preloaded/src/prim_file.erl')

diff --git a/erts/preloaded/src/prim_file.erl b/erts/preloaded/src/prim_file.erl
index f3f977a30b..606d7d5aab 100644
--- a/erts/preloaded/src/prim_file.erl
+++ b/erts/preloaded/src/prim_file.erl
@@ -27,7 +27,7 @@
 %% Generic file contents operations
 -export([open/2, close/1, datasync/1, sync/1, advise/4, position/2, truncate/1,
 	 write/2, pwrite/2, pwrite/3, read/2, read_line/1, pread/2, pread/3,
-	 copy/3, sendfile/5]).
+	 copy/3, sendfile/10]).
 
 %% Specialized file operations
 -export([open/1, open/3]).
@@ -542,21 +542,49 @@ write_file(_, _) ->
     
 
 %% Returns {error, Reason} | {ok, BytesCopied}
+sendfile(_,_,_,_,_,_,_,_,_,_) ->
+    {error, enotsup};
 sendfile(#file_descriptor{module = ?MODULE, data = {Port, _}},
-	 DestFD, Offset, Bytes, ChunkSize) ->
+	 DestFD, Offset, Bytes, ChunkSize, Headers, Trailers,
+	 Nodiskio, MNowait, Sync) ->
+
     ok = drv_command(Port, <<?FILE_SENDFILE, DestFD:32, Offset:64, Bytes:64,
-			     ChunkSize:64>>),
+			     ChunkSize:64,
+			     (get_bit(Nodiskio)):1,
+			     (get_bit(MNowait)):1,
+			     (get_bit(Sync)):1,0:5,
+			     (encode_hdtl(Headers))/binary,
+			     (encode_hdtl(Trailers))/binary>>),
     Self = self(),
     %% Should we use a ref()?
     receive
 	{efile_reply, Self, Port, {ok, _Written}=OKRes}->
 	    OKRes;
 	{efile_reply, Self, Port, {error, _PosixError}=Error}->
-	    Error;
-	Unexpected ->
-	    Unexpected
+	    Error
     end.
 
+get_bit(true) ->
+    1;
+get_bit(false) ->
+    0.
+
+encode_hdtl(undefined) ->
+    <<0>>;
+encode_hdtl([]) ->
+    <<0>>;
+encode_hdtl(List) ->
+    encode_hdtl(List,<<>>,0).
+
+encode_hdtl([], Acc, Cnt) ->
+    <<Cnt:8, Acc/binary>>;
+encode_hdtl([Bin|T], Acc, Cnt) ->
+    encode_hdtl(T, <<(byte_size(Bin)):32, Bin/binary, Acc/binary>>,Cnt + 1).
+
+
+
+
+
 %%%-----------------------------------------------------------------
 %%% Functions operating on files without handle to the file. ?DRV.
 %%%
-- 
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