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authorLukas Larsson <[email protected]>2015-09-14 11:02:18 +0200
committerLukas Larsson <[email protected]>2015-12-15 10:05:46 +0100
commit846c86559dea147d069bd489e141484dc2194610 (patch)
tree383166bb6f30baa62a6a1aa283d04c45cdd13552 /erts/emulator/test
parent0ad8c5f46bc0173c09fa5e7e91f917de82389068 (diff)
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erts: Add testcase for huge port environment
Diffstat (limited to 'erts/emulator/test')
-rw-r--r--erts/emulator/test/port_SUITE.erl38
1 files changed, 36 insertions, 2 deletions
diff --git a/erts/emulator/test/port_SUITE.erl b/erts/emulator/test/port_SUITE.erl
index b67fd1c409..6cc86a26a3 100644
--- a/erts/emulator/test/port_SUITE.erl
+++ b/erts/emulator/test/port_SUITE.erl
@@ -86,7 +86,7 @@
iter_max_ports/1, eof/1, input_only/1, output_only/1,
name1/1,
t_binary/1, parallell/1, t_exit/1,
- env/1, bad_env/1, cd/1, exit_status/1,
+ env/1, huge_env/1, bad_env/1, cd/1, exit_status/1,
tps_16_bytes/1, tps_1K/1, line/1, stderr_to_stdout/1,
otp_3906/1, otp_4389/1, win_massive/1, win_massive_client/1,
mix_up_ports/1, otp_5112/1, otp_5119/1, otp_6224/1,
@@ -112,7 +112,7 @@ all() ->
bad_packet, bad_port_messages, {group, options},
{group, multiple_packets}, parallell, dying_port,
port_program_with_path, open_input_file_port,
- open_output_file_port, name1, env, bad_env, cd,
+ open_output_file_port, name1, env, huge_env, bad_env, cd,
exit_status, iter_max_ports, count_fds, t_exit, {group, tps}, line,
stderr_to_stdout, otp_3906, otp_4389, win_massive,
mix_up_ports, otp_5112, otp_5119,
@@ -962,6 +962,40 @@ try_bad_env(Env) ->
error:badarg -> ok
end.
+%% Test that we can handle a very very large environment gracefully.
+huge_env(Config) when is_list(Config) ->
+ Vars = case os:type() of
+ {win32,_} -> 500;
+ _ ->
+ %% We create a huge environment,
+ %% 20000 variables is about 25MB
+ %% which seems to be the limit on Linux.
+ 20000
+ end,
+ Env = [{[$a + I div (25*25*25*25) rem 25,
+ $a + I div (25*25*25) rem 25,
+ $a + I div (25*25) rem 25,
+ $a+I div 25 rem 25, $a+I rem 25],
+ lists:duplicate(100,$a+I rem 25)}
+ || I <- lists:seq(1,Vars)],
+ try erlang:open_port({spawn,"ls"},[exit_status, {env, Env}]) of
+ P ->
+ receive
+ {P, {exit_status,N}} = M ->
+ %% We test that the exit status is an integer, this means
+ %% that the child program has started. If we get an atom
+ %% something went wrong in the driver which is not ok.
+ ct:log("Got ~p",[M]),
+ true = is_integer(N)
+ end
+ catch E:R ->
+ %% Have to catch the error here, as printing the stackdump
+ %% in the ct log is way to heavy for some test machines.
+ ct:fail("Open port failed ~p:~p",[E,R])
+ end.
+
+
+
%% 'cd' option
%% (Can perhaps be made smaller by calling the other utility functions
%% in this module.)