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-rw-r--r--lib/kernel/doc/src/file.xml16
-rw-r--r--lib/kernel/src/file.erl15
-rw-r--r--lib/kernel/test/sendfile_SUITE.erl70
3 files changed, 69 insertions, 32 deletions
diff --git a/lib/kernel/doc/src/file.xml b/lib/kernel/doc/src/file.xml
index 0a4dd3ba47..e2c4aab27a 100644
--- a/lib/kernel/doc/src/file.xml
+++ b/lib/kernel/doc/src/file.xml
@@ -1746,16 +1746,16 @@
<item>The chunk size used by the erlang fallback to send
data. If using the fallback, this should be set to a value
which comfortably fits in the systems memory. Default is 20 MB.</item>
+ <tag><c>use_threads</c></tag>
+ <item>Instruct the emulator to use the async thread pool for the
+ sendfile system call. This could be usefull if the OS you are running
+ on does not properly support non-blocking sendfile calls. Do note that
+ using async threads potentially makes your system volnerable to slow
+ client attacks. If set to true and no async threads are available,
+ the sendfile call will return <c>{error,einval}</c>.
+ Introduced in 17.0. Default is false.</item>
</taglist>
</p>
- <p>On operating systems with thread support, it is recommended to use
- async threads. See the command line flag
- <c>+A</c> in <seealso marker="erts:erl">erl(1)</seealso>. If it is not
- possible to use async threads for sendfile, it is recommended to use
- a relatively small value for the send buffer on the socket. Otherwise
- the Erlang VM might loose some of its soft realtime guarantees.
- Which size to use depends on the OS/hardware and the requirements
- of the application.</p>
</desc>
</func>
<func>
diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl
index b5152018e0..23cf74f80f 100644
--- a/lib/kernel/src/file.erl
+++ b/lib/kernel/src/file.erl
@@ -111,7 +111,8 @@
-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()}.
+-type sendfile_option() :: {chunk_size, non_neg_integer()}
+ | {use_threads, boolean()}.
-type file_info_option() :: {'time', 'local'} | {'time', 'universal'}
| {'time', 'posix'}.
%%% BIFs
@@ -1229,8 +1230,7 @@ change_time(Name, {{AY, AM, AD}, {AH, AMin, ASec}}=Atime,
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, ?MAX_CHUNK_SIZE, [], [], []);
sendfile(File, Sock, Offset, Bytes, Opts) ->
ChunkSize0 = proplists:get_value(chunk_size, Opts, ?MAX_CHUNK_SIZE),
ChunkSize = if ChunkSize0 > ?MAX_CHUNK_SIZE ->
@@ -1240,8 +1240,7 @@ sendfile(File, Sock, Offset, Bytes, Opts) ->
%% Support for headers, trailers and options has been removed because the
%% Darwin and BSD API for using it does not play nice with
%% non-blocking sockets. See unix_efile.c for more info.
- sendfile(File, Sock, Offset, Bytes, ChunkSize, [], [],
- false,false,false).
+ sendfile(File, Sock, Offset, Bytes, ChunkSize, [], [], Opts).
%% sendfile/2
-spec sendfile(Filename, Socket) ->
@@ -1261,17 +1260,17 @@ sendfile(Filename, Sock) ->
%% Internal sendfile functions
sendfile(#file_descriptor{ module = Mod } = Fd, Sock, Offset, Bytes,
- ChunkSize, Headers, Trailers, Nodiskio, MNowait, Sync)
+ ChunkSize, Headers, Trailers, Opts)
when is_port(Sock) ->
case Mod:sendfile(Fd, Sock, Offset, Bytes, ChunkSize, Headers, Trailers,
- Nodiskio, MNowait, Sync) of
+ Opts) of
{error, enotsup} ->
sendfile_fallback(Fd, Sock, Offset, Bytes, ChunkSize,
Headers, Trailers);
Else ->
Else
end;
-sendfile(_,_,_,_,_,_,_,_,_,_) ->
+sendfile(_,_,_,_,_,_,_,_) ->
{error, badarg}.
%%%
diff --git a/lib/kernel/test/sendfile_SUITE.erl b/lib/kernel/test/sendfile_SUITE.erl
index 4cf4c6489d..1d26702c64 100644
--- a/lib/kernel/test/sendfile_SUITE.erl
+++ b/lib/kernel/test/sendfile_SUITE.erl
@@ -24,7 +24,14 @@
-compile(export_all).
-all() ->
+all() -> [{group,async_threads},
+ {group,no_async_threads}].
+
+groups() ->
+ [{async_threads,[],tcs()},
+ {no_async_threads,[],tcs()}].
+
+tcs() ->
[t_sendfile_small
,t_sendfile_big_all
,t_sendfile_big_size
@@ -63,6 +70,14 @@ init_per_suite(Config) ->
end_per_suite(Config) ->
file:delete(proplists:get_value(big_file, Config)).
+init_per_group(async_threads,Config) ->
+ [{sendfile_opts,[{use_threads,true}]}|Config];
+init_per_group(no_async_threads,Config) ->
+ [{sendfile_opts,[{use_threads,false}]}|Config].
+
+end_per_group(_,_Config) ->
+ ok.
+
init_per_testcase(TC,Config) when TC == t_sendfile_recvduring;
TC == t_sendfile_sendduring ->
Filename = proplists:get_value(small_file, Config),
@@ -71,7 +86,7 @@ init_per_testcase(TC,Config) when TC == t_sendfile_recvduring;
{_Size, Data} = sendfile_file_info(Filename),
{ok,D} = file:open(Filename, [raw,binary,read]),
prim_file:sendfile(D, Sock, 0, 0, 0,
- [],[],false,false,false),
+ [],[],[]),
Data
end,
@@ -92,6 +107,7 @@ t_sendfile_small(Config) when is_list(Config) ->
Send = fun(Sock) ->
{Size, Data} = sendfile_file_info(Filename),
+ %% Here we make sure to test the sendfile/2 api
{ok, Size} = file:sendfile(Filename, Sock),
Data
end,
@@ -101,6 +117,7 @@ t_sendfile_small(Config) when is_list(Config) ->
t_sendfile_many_small(Config) when is_list(Config) ->
Filename = proplists:get_value(small_file, Config),
FileOpts = proplists:get_value(file_opts, Config, []),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
error_logger:add_report_handler(?MODULE,[self()]),
@@ -109,7 +126,7 @@ t_sendfile_many_small(Config) when is_list(Config) ->
N = 10000,
{ok,D} = file:open(Filename,[read|FileOpts]),
[begin
- {ok,Size} = file:sendfile(D,Sock,0,0,[])
+ {ok,Size} = file:sendfile(D,Sock,0,0,SendfileOpts)
end || _I <- lists:seq(1,N)],
file:close(D),
Size*N
@@ -127,11 +144,12 @@ t_sendfile_many_small(Config) when is_list(Config) ->
t_sendfile_big_all(Config) when is_list(Config) ->
Filename = proplists:get_value(big_file, Config),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
Send = fun(Sock) ->
{ok, #file_info{size = Size}} =
file:read_file_info(Filename),
- {ok, Size} = file:sendfile(Filename, Sock),
+ {ok, Size} = sendfile(Filename, Sock, SendfileOpts),
Size
end,
@@ -140,12 +158,13 @@ t_sendfile_big_all(Config) when is_list(Config) ->
t_sendfile_big_size(Config) ->
Filename = proplists:get_value(big_file, Config),
FileOpts = proplists:get_value(file_opts, Config, []),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
SendAll = fun(Sock) ->
{ok, #file_info{size = Size}} =
file:read_file_info(Filename),
{ok,D} = file:open(Filename,[read|FileOpts]),
- {ok, Size} = file:sendfile(D, Sock,0,Size,[]),
+ {ok, Size} = file:sendfile(D, Sock,0,Size,SendfileOpts),
Size
end,
@@ -154,12 +173,13 @@ t_sendfile_big_size(Config) ->
t_sendfile_partial(Config) ->
Filename = proplists:get_value(small_file, Config),
FileOpts = proplists:get_value(file_opts, Config, []),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
SendSingle = fun(Sock) ->
{_Size, <<Data:5/binary,_/binary>>} =
sendfile_file_info(Filename),
{ok,D} = file:open(Filename,[read|FileOpts]),
- {ok,5} = file:sendfile(D,Sock,0,5,[]),
+ {ok,5} = file:sendfile(D,Sock,0,5,SendfileOpts),
file:close(D),
Data
end,
@@ -170,14 +190,14 @@ t_sendfile_partial(Config) ->
{ok,D} = file:open(Filename,[read|FileOpts]),
{ok, <<FData/binary>>} = file:read(D,5),
FSend = fun(Sock) ->
- {ok,5} = file:sendfile(D,Sock,0,5,[]),
+ {ok,5} = file:sendfile(D,Sock,0,5,SendfileOpts),
FData
end,
ok = sendfile_send(FSend),
SSend = fun(Sock) ->
- {ok,3} = file:sendfile(D,Sock,5,3,[]),
+ {ok,3} = file:sendfile(D,Sock,5,3,SendfileOpts),
SData
end,
@@ -190,12 +210,13 @@ t_sendfile_partial(Config) ->
t_sendfile_offset(Config) ->
Filename = proplists:get_value(small_file, Config),
FileOpts = proplists:get_value(file_opts, Config, []),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
Send = fun(Sock) ->
{_Size, <<_:5/binary,Data:3/binary,_/binary>> = AllData} =
sendfile_file_info(Filename),
{ok,D} = file:open(Filename,[read|FileOpts]),
- {ok,3} = file:sendfile(D,Sock,5,3,[]),
+ {ok,3} = file:sendfile(D,Sock,5,3,SendfileOpts),
{ok, AllData} = file:read(D,100),
file:close(D),
Data
@@ -205,10 +226,11 @@ t_sendfile_offset(Config) ->
t_sendfile_sendafter(Config) ->
Filename = proplists:get_value(small_file, Config),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
Send = fun(Sock) ->
{Size, Data} = sendfile_file_info(Filename),
- {ok, Size} = file:sendfile(Filename, Sock),
+ {ok, Size} = sendfile(Filename, Sock, SendfileOpts),
ok = gen_tcp:send(Sock, <<2>>),
<<Data/binary,2>>
end,
@@ -217,10 +239,11 @@ t_sendfile_sendafter(Config) ->
t_sendfile_recvafter(Config) ->
Filename = proplists:get_value(small_file, Config),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
Send = fun(Sock) ->
{Size, Data} = sendfile_file_info(Filename),
- {ok, Size} = file:sendfile(Filename, Sock),
+ {ok, Size} = sendfile(Filename, Sock, SendfileOpts),
ok = gen_tcp:send(Sock, <<1>>),
{ok,<<1>>} = gen_tcp:recv(Sock, 1),
<<Data/binary,1>>
@@ -230,6 +253,7 @@ t_sendfile_recvafter(Config) ->
t_sendfile_sendduring(Config) ->
Filename = proplists:get_value(big_file, Config),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
Send = fun(Sock) ->
{ok, #file_info{size = Size}} =
@@ -238,7 +262,7 @@ t_sendfile_sendduring(Config) ->
timer:sleep(50),
ok = gen_tcp:send(Sock, <<2>>)
end),
- {ok, Size} = file:sendfile(Filename, Sock),
+ {ok, Size} = sendfile(Filename, Sock, SendfileOpts),
Size+1
end,
@@ -246,6 +270,7 @@ t_sendfile_sendduring(Config) ->
t_sendfile_recvduring(Config) ->
Filename = proplists:get_value(big_file, Config),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
Send = fun(Sock) ->
{ok, #file_info{size = Size}} =
@@ -255,7 +280,7 @@ t_sendfile_recvduring(Config) ->
ok = gen_tcp:send(Sock, <<1>>),
{ok,<<1>>} = gen_tcp:recv(Sock, 1)
end),
- {ok, Size} = file:sendfile(Filename, Sock),
+ {ok, Size} = sendfile(Filename, Sock, SendfileOpts),
timer:sleep(1000),
Size+1
end,
@@ -264,6 +289,7 @@ t_sendfile_recvduring(Config) ->
t_sendfile_closeduring(Config) ->
Filename = proplists:get_value(big_file, Config),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
Send = fun(Sock,SFServPid) ->
spawn_link(fun() ->
@@ -272,13 +298,14 @@ t_sendfile_closeduring(Config) ->
end),
case erlang:system_info(thread_pool_size) of
0 ->
- {error, closed} = file:sendfile(Filename, Sock);
+ {error, closed} = sendfile(Filename, Sock,
+ SendfileOpts);
_Else ->
%% This can return how much has been sent or
%% {error,closed} depending on OS.
%% How much is sent impossible to know as
%% the socket was closed mid sendfile
- case file:sendfile(Filename, Sock) of
+ case sendfile(Filename, Sock, SendfileOpts) of
{error, closed} ->
ok;
{ok, Size} when is_integer(Size) ->
@@ -292,6 +319,7 @@ t_sendfile_closeduring(Config) ->
t_sendfile_crashduring(Config) ->
Filename = proplists:get_value(big_file, Config),
+ SendfileOpts = proplists:get_value(sendfile_opts, Config),
error_logger:add_report_handler(?MODULE,[self()]),
@@ -300,7 +328,7 @@ t_sendfile_crashduring(Config) ->
timer:sleep(50),
exit(die)
end),
- {error, closed} = file:sendfile(Filename, Sock),
+ {error, closed} = sendfile(Filename, Sock, SendfileOpts),
-1
end,
process_flag(trap_exit,true),
@@ -395,6 +423,16 @@ sendfile_file_info(File) ->
{ok, Data} = file:read_file(File),
{Size, Data}.
+sendfile(Filename,Sock,Opts) ->
+ case file:open(Filename, [read, raw, binary]) of
+ {error, Reason} ->
+ {error, Reason};
+ {ok, Fd} ->
+ Res = file:sendfile(Fd, Sock, 0, 0, Opts),
+ _ = file:close(Fd),
+ Res
+ end.
+
%% Error handler
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-12 07:09:19 +0000