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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1997-2009. 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/1]).
+-export([iter_max_files/1]).
+
+-include("test_server.hrl").
+
+all(suite) -> [iter_max_files].
+
+%%
+%% 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.