diff options
Diffstat (limited to 'lib/kernel/src/file.erl')
| -rw-r--r-- | lib/kernel/src/file.erl | 139 |
1 files changed, 138 insertions, 1 deletions
diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl index 706c60caaf..0b0f91d86a 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 +106,7 @@ -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()}. %%%----------------------------------------------------------------- %%% General functions @@ -1114,6 +1117,140 @@ 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(RawFile, Socket, Offset, Bytes, Opts) -> + {'ok', non_neg_integer()} | {'error', inet:posix() | badarg | not_owner} when + RawFile :: file:fd(), + Socket :: 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, + %% 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/2 +-spec sendfile(Filename, Socket) -> + {'ok', non_neg_integer()} | {'error', inet:posix() | badarg | not_owner} + when Filename :: file:name(), + Socket :: inet:socket(). +sendfile(Filename, Sock) -> + case file:open(Filename, [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 |