From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 erts/emulator/test/efile_SUITE.erl | 76 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 erts/emulator/test/efile_SUITE.erl

(limited to 'erts/emulator/test/efile_SUITE.erl')

diff --git a/erts/emulator/test/efile_SUITE.erl b/erts/emulator/test/efile_SUITE.erl
new file mode 100644
index 0000000000..1d66b6ef70
--- /dev/null
+++ b/erts/emulator/test/efile_SUITE.erl
@@ -0,0 +1,76 @@
+%%
+%% %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.
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