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authorErlang/OTP <[email protected]>2010-05-24 13:15:03 +0000
committerErlang/OTP <[email protected]>2010-05-24 13:15:03 +0000
commitbe2ebfd0f2b8e15363288d1dab4c177c237e234a (patch)
treeb0f8e2844240211f02f89c6fc09a1945af337d1b /erts/preloaded/src
parent458dcb10f98bffd241a837cbac7c108eb485f706 (diff)
parent329aff8ed81e94033c836e58bd294a68a8f7be8c (diff)
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Merge branch 'fm/file-operations' into dev
* fm/file-operations: Update preloaded modules Add file:advise/4 - a wrapper to the POSIX syscall posix_fadvise Add file:datasync/1 for syncing file contents only sys.h: Correct the get_int64() macro OTP-8637 fm/file-operations The functions file:advise/4 and file:datasync/1 have been added. (Thanks to Filipe David Manana.)
Diffstat (limited to 'erts/preloaded/src')
-rw-r--r--erts/preloaded/src/prim_file.erl52
1 files changed, 46 insertions, 6 deletions
diff --git a/erts/preloaded/src/prim_file.erl b/erts/preloaded/src/prim_file.erl
index 43e6f6cd88..2d177bf80e 100644
--- a/erts/preloaded/src/prim_file.erl
+++ b/erts/preloaded/src/prim_file.erl
@@ -1,19 +1,19 @@
%%
%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 2000-2009. All Rights Reserved.
-%%
+%%
+%% Copyright Ericsson AB 2000-2010. 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
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
-%%
+%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
-%%
+%%
%% %CopyrightEnd%
%%
-module(prim_file).
@@ -25,7 +25,7 @@
%%% Interface towards a single file's contents. Uses ?FD_DRV.
%% Generic file contents operations
--export([open/2, close/1, sync/1, position/2, truncate/1,
+-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]).
%% Specialized file operations
@@ -96,6 +96,8 @@
-define(FILE_IPREAD, 27).
-define(FILE_ALTNAME, 28).
-define(FILE_READ_LINE, 29).
+-define(FILE_FDATASYNC, 30).
+-define(FILE_ADVISE, 31).
%% Driver responses
-define(FILE_RESP_OK, 0).
@@ -130,6 +132,13 @@
%% IPREAD variants
-define(IPREAD_S32BU_P32BU, 0).
+%% POSIX file advises
+-define(POSIX_FADV_NORMAL, 0).
+-define(POSIX_FADV_RANDOM, 1).
+-define(POSIX_FADV_SEQUENTIAL, 2).
+-define(POSIX_FADV_WILLNEED, 3).
+-define(POSIX_FADV_DONTNEED, 4).
+-define(POSIX_FADV_NOREUSE, 5).
%%%-----------------------------------------------------------------
@@ -220,7 +229,35 @@ close(#file_descriptor{module = ?MODULE, data = {Port, _}}) ->
close(Port) when is_port(Port) ->
drv_close(Port).
+-define(ADVISE(Offs, Len, Adv),
+ <<?FILE_ADVISE, Offs:64/signed, Len:64/signed,
+ Adv:32/signed>>).
+%% Returns {error, Reason} | ok.
+advise(#file_descriptor{module = ?MODULE, data = {Port, _}},
+ Offset, Length, Advise) ->
+ case Advise of
+ normal ->
+ Cmd = ?ADVISE(Offset, Length, ?POSIX_FADV_NORMAL),
+ drv_command(Port, Cmd);
+ random ->
+ Cmd = ?ADVISE(Offset, Length, ?POSIX_FADV_RANDOM),
+ drv_command(Port, Cmd);
+ sequential ->
+ Cmd = ?ADVISE(Offset, Length, ?POSIX_FADV_SEQUENTIAL),
+ drv_command(Port, Cmd);
+ will_need ->
+ Cmd = ?ADVISE(Offset, Length, ?POSIX_FADV_WILLNEED),
+ drv_command(Port, Cmd);
+ dont_need ->
+ Cmd = ?ADVISE(Offset, Length, ?POSIX_FADV_DONTNEED),
+ drv_command(Port, Cmd);
+ no_reuse ->
+ Cmd = ?ADVISE(Offset, Length, ?POSIX_FADV_NOREUSE),
+ drv_command(Port, Cmd);
+ _ ->
+ {error, einval}
+ end.
%% Returns {error, Reason} | ok.
write(#file_descriptor{module = ?MODULE, data = {Port, _}}, Bytes) ->
@@ -292,6 +329,9 @@ pwrite(#file_descriptor{module = ?MODULE}, _, _) ->
{error, badarg}.
+%% Returns {error, Reason} | ok.
+datasync(#file_descriptor{module = ?MODULE, data = {Port, _}}) ->
+ drv_command(Port, [?FILE_FDATASYNC]).
%% Returns {error, Reason} | ok.
sync(#file_descriptor{module = ?MODULE, data = {Port, _}}) ->