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-rw-r--r--lib/kernel/src/file.erl142
1 files changed, 141 insertions, 1 deletions
diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl
index 706c60caaf..ef1d20b53b 100644
--- a/lib/kernel/src/file.erl
+++ b/lib/kernel/src/file.erl
@@ -51,6 +51,9 @@
-export([pid2name/1]).
+%% Sendfile functions
+-export([sendfile/2,sendfile/5]).
+
%%% Obsolete exported functions
-export([raw_read_file_info/1, raw_write_file_info/2]).
@@ -103,7 +106,10 @@
-type date_time() :: calendar:datetime().
-type posix_file_advise() :: 'normal' | 'sequential' | 'random'
| 'no_reuse' | 'will_need' | 'dont_need'.
-
+-type sendfile_option() :: {chunk_size, non_neg_integer()} |
+ {headers, Hdrs :: list(iodata())} |
+ {trailers, Tlrs :: list(iodata())} |
+ sf_nodiskio | sf_mnowait | sf_sync.
%%%-----------------------------------------------------------------
%%% General functions
@@ -1114,6 +1120,140 @@ change_time(Name, Atime, Mtime)
when is_tuple(Atime), is_tuple(Mtime) ->
write_file_info(Name, #file_info{atime=Atime, mtime=Mtime}).
+%%
+%% Send data using sendfile
+%%
+
+-define(MAX_CHUNK_SIZE, (1 bsl 20)*20). %% 20 MB, has to fit in primary memory
+
+-spec sendfile(File, Sock, Offset, Bytes, Opts) ->
+ {'ok', non_neg_integer()} | {'error', inet:posix() | badarg | not_owner} when
+ File :: file:fd(),
+ Sock :: inet:socket(),
+ Offset :: non_neg_integer(),
+ Bytes :: non_neg_integer(),
+ Opts :: [sendfile_option()].
+sendfile(File, _Sock, _Offet, _Bytes, _Opts) when is_pid(File) ->
+ {error, badarg};
+sendfile(File, Sock, Offset, Bytes, []) ->
+ sendfile(File, Sock, Offset, Bytes, ?MAX_CHUNK_SIZE, [], [],
+ false, false, false);
+sendfile(File, Sock, Offset, Bytes, Opts) ->
+ ChunkSize0 = proplists:get_value(chunk_size, Opts, ?MAX_CHUNK_SIZE),
+ ChunkSize = if ChunkSize0 > ?MAX_CHUNK_SIZE ->
+ ?MAX_CHUNK_SIZE;
+ true -> ChunkSize0
+ end,
+ Headers = proplists:get_value(headers, Opts, []),
+ Trailers = proplists:get_value(trailers, Opts, []),
+ sendfile(File, Sock, Offset, Bytes, ChunkSize, Headers, Trailers,
+ lists:member(sf_nodiskio,Opts),lists:member(sf_mnowait,Opts),
+ lists:member(sf_sync,Opts)).
+
+%% sendfile/2
+-spec sendfile(File, Sock) ->
+ {'ok', non_neg_integer()} | {'error', inet:posix() | badarg | not_owner}
+ when File :: file:name(),
+ Sock :: inet:socket().
+sendfile(File, Sock) ->
+ case file:open(File, [read, raw, binary]) of
+ {error, Reason} ->
+ {error, Reason};
+ {ok, Fd} ->
+ Res = sendfile(Fd, Sock, 0, 0, []),
+ file:close(Fd),
+ Res
+ end.
+
+%% Internal sendfile functions
+sendfile(#file_descriptor{ module = Mod } = Fd, Sock, Offset, Bytes,
+ ChunkSize, Headers, Trailers, Nodiskio, MNowait, Sync)
+ when is_port(Sock) ->
+ case Mod:sendfile(Fd, Sock, Offset, Bytes, ChunkSize, Headers, Trailers,
+ Nodiskio, MNowait, Sync) of
+ {error, enotsup} ->
+ sendfile_fallback(Fd, Sock, Offset, Bytes, ChunkSize,
+ Headers, Trailers);
+ Else ->
+ Else
+ end;
+sendfile(_,_,_,_,_,_,_,_,_,_) ->
+ {error, badarg}.
+
+%%%
+%% Sendfile Fallback
+%%%
+sendfile_fallback(File, Sock, Offset, Bytes, ChunkSize,
+ Headers, Trailers)
+ when Headers == []; is_integer(Headers) ->
+ case sendfile_fallback(File, Sock, Offset, Bytes, ChunkSize) of
+ {ok, BytesSent} when is_list(Trailers),
+ Trailers =/= [],
+ is_integer(Headers) ->
+ sendfile_send(Sock, Trailers, BytesSent+Headers);
+ {ok, BytesSent} when is_list(Trailers), Trailers =/= [] ->
+ sendfile_send(Sock, Trailers, BytesSent);
+ {ok, BytesSent} when is_integer(Headers) ->
+ {ok, BytesSent + Headers};
+ Else ->
+ Else
+ end;
+sendfile_fallback(File, Sock, Offset, Bytes, ChunkSize, Headers, Trailers) ->
+ case sendfile_send(Sock, Headers, 0) of
+ {ok, BytesSent} ->
+ sendfile_fallback(File, Sock, Offset, Bytes, ChunkSize, BytesSent,
+ Trailers);
+ Else ->
+ Else
+ end.
+
+
+sendfile_fallback(File, Sock, Offset, Bytes, ChunkSize) ->
+ {ok, CurrPos} = file:position(File, {cur, 0}),
+ {ok, _NewPos} = file:position(File, {bof, Offset}),
+ Res = sendfile_fallback_int(File, Sock, Bytes, ChunkSize, 0),
+ file:position(File, {bof, CurrPos}),
+ Res.
+
+
+sendfile_fallback_int(File, Sock, Bytes, ChunkSize, BytesSent)
+ when Bytes > BytesSent; Bytes == 0 ->
+ Size = if Bytes == 0 ->
+ ChunkSize;
+ (Bytes - BytesSent + ChunkSize) > 0 ->
+ Bytes - BytesSent;
+ true ->
+ ChunkSize
+ end,
+ case file:read(File, Size) of
+ {ok, Data} ->
+ case sendfile_send(Sock, Data, BytesSent) of
+ {ok,NewBytesSent} ->
+ sendfile_fallback_int(
+ File, Sock, Bytes, ChunkSize,
+ NewBytesSent);
+ Error ->
+ Error
+ end;
+ eof ->
+ {ok, BytesSent};
+ Error ->
+ Error
+ end;
+sendfile_fallback_int(_File, _Sock, BytesSent, _ChunkSize, BytesSent) ->
+ {ok, BytesSent}.
+
+sendfile_send(Sock, Data, Old) ->
+ Len = iolist_size(Data),
+ case gen_tcp:send(Sock, Data) of
+ ok ->
+ {ok, Len+Old};
+ Else ->
+ Else
+ end.
+
+
+
%%%-----------------------------------------------------------------
%%% Helpers