diff options
Diffstat (limited to 'lib/kernel/src/file.erl')
| -rw-r--r-- | lib/kernel/src/file.erl | 211 |
1 files changed, 199 insertions, 12 deletions
diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl index 5e4e1b0ba8..cdb984c333 100644 --- a/lib/kernel/src/file.erl +++ b/lib/kernel/src/file.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1996-2011. All Rights Reserved. +%% Copyright Ericsson AB 1996-2012. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -28,9 +28,11 @@ %% File system and metadata. -export([get_cwd/0, get_cwd/1, set_cwd/1, delete/1, rename/2, make_dir/1, del_dir/1, list_dir/1, - read_file_info/1, write_file_info/2, + read_file_info/1, read_file_info/2, + write_file_info/2, write_file_info/3, altname/1, - read_link_info/1, read_link/1, + read_link_info/1, read_link_info/2, + read_link/1, make_link/2, make_symlink/2, read_file/1, write_file/2, write_file/3]). %% Specialized @@ -51,6 +53,9 @@ -export([pid2name/1]). +%% Sendfile functions +-export([sendfile/2,sendfile/5]). + %%% Obsolete exported functions -export([raw_read_file_info/1, raw_write_file_info/2]). @@ -103,6 +108,10 @@ -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()}. +-type file_info_option() :: {'time', 'local'} | {'time', 'universal'} + | {'time', 'posix'}. + %%%----------------------------------------------------------------- %%% General functions @@ -211,6 +220,15 @@ del_dir(Name) -> read_file_info(Name) -> check_and_call(read_file_info, [file_name(Name)]). +-spec read_file_info(Filename, Opts) -> {ok, FileInfo} | {error, Reason} when + Filename :: name(), + Opts :: [file_info_option()], + FileInfo :: file_info(), + Reason :: posix() | badarg. + +read_file_info(Name, Opts) when is_list(Opts) -> + check_and_call(read_file_info, [file_name(Name), Opts]). + -spec altname(Name :: name()) -> any(). altname(Name) -> @@ -224,6 +242,16 @@ altname(Name) -> read_link_info(Name) -> check_and_call(read_link_info, [file_name(Name)]). +-spec read_link_info(Name, Opts) -> {ok, FileInfo} | {error, Reason} when + Name :: name(), + Opts :: [file_info_option()], + FileInfo :: file_info(), + Reason :: posix() | badarg. + +read_link_info(Name, Opts) when is_list(Opts) -> + check_and_call(read_link_info, [file_name(Name),Opts]). + + -spec read_link(Name) -> {ok, Filename} | {error, Reason} when Name :: name(), Filename :: filename(), @@ -240,6 +268,15 @@ read_link(Name) -> write_file_info(Name, Info = #file_info{}) -> check_and_call(write_file_info, [file_name(Name), Info]). +-spec write_file_info(Filename, FileInfo, Opts) -> ok | {error, Reason} when + Filename :: name(), + Opts :: [file_info_option()], + FileInfo :: file_info(), + Reason :: posix() | badarg. + +write_file_info(Name, Info = #file_info{}, Opts) when is_list(Opts) -> + check_and_call(write_file_info, [file_name(Name), Info, Opts]). + -spec list_dir(Dir) -> {ok, Filenames} | {error, Reason} when Dir :: name(), Filenames :: [filename()], @@ -264,9 +301,9 @@ read_file(Name) -> make_link(Old, New) -> check_and_call(make_link, [file_name(Old), file_name(New)]). --spec make_symlink(Name1, Name2) -> ok | {error, Reason} when - Name1 :: name(), - Name2 :: name(), +-spec make_symlink(Existing, New) -> ok | {error, Reason} when + Existing :: name(), + New :: name(), Reason :: posix() | badarg. make_symlink(Old, New) -> @@ -1100,8 +1137,9 @@ change_group(Name, GroupId) Mtime :: date_time(), Reason :: posix() | badarg. -change_time(Name, Time) - when is_tuple(Time) -> +change_time(Name, {{Y, M, D}, {H, Min, Sec}}=Time) + when is_integer(Y), is_integer(M), is_integer(D), + is_integer(H), is_integer(Min), is_integer(Sec)-> write_file_info(Name, #file_info{mtime=Time}). -spec change_time(Filename, Atime, Mtime) -> ok | {error, Reason} when @@ -1110,10 +1148,150 @@ change_time(Name, Time) Mtime :: date_time(), Reason :: posix() | badarg. -change_time(Name, Atime, Mtime) - when is_tuple(Atime), is_tuple(Mtime) -> +change_time(Name, {{AY, AM, AD}, {AH, AMin, ASec}}=Atime, + {{MY, MM, MD}, {MH, MMin, MSec}}=Mtime) + when is_integer(AY), is_integer(AM), is_integer(AD), + is_integer(AH), is_integer(AMin), is_integer(ASec), + is_integer(MY), is_integer(MM), is_integer(MD), + is_integer(MH), is_integer(MMin), is_integer(MSec)-> 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() | + closed | 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() | + closed | 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 -> + 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 @@ -1163,7 +1341,7 @@ path_open_first([Path|Rest], Name, Mode, LastError) -> {error, _} = Error -> Error; FilePath -> - FileName = filename:join(FilePath, Name), + FileName = fname_join(FilePath, Name), case open(FileName, Mode) of {ok, Fd} -> {ok, Fd, FileName}; @@ -1176,6 +1354,11 @@ path_open_first([Path|Rest], Name, Mode, LastError) -> path_open_first([], _Name, _Mode, LastError) -> {error, LastError}. +fname_join(".", Name) -> + Name; +fname_join(Dir, Name) -> + filename:join(Dir, Name). + %%%----------------------------------------------------------------- %%% Utility functions. @@ -1233,7 +1416,11 @@ mode_list(_) -> %% Functions for communicating with the file server call(Command, Args) when is_list(Args) -> - gen_server:call(?FILE_SERVER, list_to_tuple([Command | Args]), infinity). + X = erlang:dt_spread_tag(true), + Y = gen_server:call(?FILE_SERVER, list_to_tuple([Command | Args]), + infinity), + erlang:dt_restore_tag(X), + Y. check_and_call(Command, Args) when is_list(Args) -> case check_args(Args) of |