%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2010. 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(efile_SUITE).
-export([all/0,groups/0,init_per_group/2,end_per_group/2]).
-export([iter_max_files/1]).
-include_lib("test_server/include/test_server.hrl").
all() ->
[iter_max_files].
groups() ->
[].
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
%%
%% Open as many files as possible. Do this several times and check
%% that we get the same number of files every time.
%%
iter_max_files(suite) -> [];
iter_max_files(Config) when is_list(Config) ->
?line DataDir = ?config(data_dir,Config),
?line TestFile = filename:join(DataDir, "existing_file"),
?line L = do_iter_max_files(10, TestFile),
?line io:format("Number of files opened in each test:~n~w\n", [L]),
?line all_equal(L),
Head = hd(L),
if Head >= 2 -> ok;
true -> ?line test_server:fail(too_few_files)
end,
{comment, "Max files: " ++ integer_to_list(hd(L))}.
do_iter_max_files(N, Name) when N > 0 ->
?line [max_files(Name)| do_iter_max_files(N-1, Name)];
do_iter_max_files(_, _) ->
[].
all_equal([E, E| T]) ->
?line all_equal([E| T]);
all_equal([_]) ->
ok;
all_equal([]) ->
ok.
max_files(Name) ->
?line Fds = open_files(Name),
?line N = length(Fds),
?line close_files(Fds),
N.
close_files([Fd| Fds]) ->
?line file:close(Fd),
?line close_files(Fds);
close_files([]) ->
ok.
open_files(Name) ->
?line case file:open(Name, [read,raw]) of
{ok, Fd} ->
[Fd| open_files(Name)];
{error, Reason} ->
io:format("Error reason: ~p", [Reason]),
[]
end.
