diff options
Diffstat (limited to 'lib/kernel/src/file.erl')
| -rw-r--r-- | lib/kernel/src/file.erl | 73 |
1 files changed, 68 insertions, 5 deletions
diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl index 0b0f91d86a..bdafcf2cfb 100644 --- a/lib/kernel/src/file.erl +++ b/lib/kernel/src/file.erl @@ -28,9 +28,10 @@ %% 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 @@ -212,7 +213,10 @@ del_dir(Name) -> Reason :: posix() | badarg. read_file_info(Name) -> - check_and_call(read_file_info, [file_name(Name)]). + file_info_time(local, check_and_call(read_file_info, [file_name(Name)])). + +read_file_info(Name, Opts) when is_list(Opts) -> + file_info_time(proplists:get_value(time, Opts, local), check_and_call(read_file_info, [file_name(Name)])). -spec altname(Name :: name()) -> any(). @@ -225,7 +229,10 @@ altname(Name) -> Reason :: posix() | badarg. read_link_info(Name) -> - check_and_call(read_link_info, [file_name(Name)]). + read_link_info(Name, [{time, local}]). + +read_link_info(Name, Opts) when is_list(Opts) -> + file_info_time(proplists:get_value(time, Opts, local), check_and_call(read_link_info, [file_name(Name)])). -spec read_link(Name) -> {ok, Filename} | {error, Reason} when Name :: name(), @@ -241,7 +248,10 @@ read_link(Name) -> Reason :: posix() | badarg. write_file_info(Name, Info = #file_info{}) -> - check_and_call(write_file_info, [file_name(Name), Info]). + check_and_call(write_file_info, [file_name(Name), file_info_epochs(local, Info)]). + +write_file_info(Name, Info = #file_info{}, Opts) when is_list(Opts) -> + check_and_call(write_file_info, [file_name(Name), file_info_epochs(proplists:get_value(time, Opts, local), Info)]). -spec list_dir(Dir) -> {ok, Filenames} | {error, Reason} when Dir :: name(), @@ -1321,6 +1331,59 @@ fname_join(Dir, Name) -> %%%----------------------------------------------------------------- %%% Utility functions. +%% convert file times. +%% all times from prime_file (and file_server) are in unix epochs + +%% from_epochs +file_info_time(epoch, {ok, FI}) -> FI; +file_info_time(local, {ok, #file_info{ atime = Atime, ctime = Ctime, mtime = Mtime } = FI}) -> + {ok, FI#file_info{ + atime = time_epochs_to_local(Atime), + ctime = time_epochs_to_local(Ctime), + mtime = time_epochs_to_local(Mtime) + } + }; +file_info_time(utc, {ok, #file_info{ atime = Atime, ctime = Ctime, mtime = Mtime } = FI}) -> + {ok, FI#file_info{ + atime = time_epochs_to_utc(Atime), + ctime = time_epochs_to_utc(Ctime), + mtime = time_epochs_to_utc(Mtime) + } + }; +file_info_time(_, Error) -> Error. + +%% from_epochs +file_info_epochs(epoch, FI) -> FI; +file_info_epochs(local, #file_info{ atime = Atime, ctime = Ctime, mtime = Mtime } = FI) -> + FI#file_info{ + atime = time_local_to_epochs(Atime), + ctime = time_local_to_epochs(Ctime), + mtime = time_local_to_epochs(Mtime) + }; +file_info_epochs(utc, {ok, #file_info{ atime = Atime, ctime = Ctime, mtime = Mtime } = FI}) -> + FI#file_info{ + atime = time_utc_to_epochs(Atime), + ctime = time_utc_to_epochs(Ctime), + mtime = time_utc_to_epochs(Mtime) + }. + + +-define(DAYS_FROM_0_TO_1970, 719528). +-define(SECONDS_PER_DAY, 86400). + +time_epochs_to_utc(Seconds) when is_integer(Seconds) -> + calendar:gregorian_seconds_to_datetime(Seconds + ?SECONDS_PER_DAY * ?DAYS_FROM_0_TO_1970). + +time_epochs_to_local(Seconds) when is_integer(Seconds) -> + erlang:universaltime_to_localtime(calendar:gregorian_seconds_to_datetime(Seconds + ?SECONDS_PER_DAY * ?DAYS_FROM_0_TO_1970)). + +time_utc_to_epochs({_, _} = Datetime) -> + calendar:datetime_to_gregorian_seconds(Datetime) - ?SECONDS_PER_DAY * ?DAYS_FROM_0_TO_1970. + +time_local_to_epochs({_, _} = Datetime) -> + calendar:datetime_to_gregorian_seconds(erlang:localtime_to_universaltime(Datetime)) - ?SECONDS_PER_DAY * ?DAYS_FROM_0_TO_1970. + + %% file_name(FileName) %% Generates a flat file name from a deep list of atoms and %% characters (integers). |