%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2005-2010. 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(emem_SUITE).
%%-define(line_trace, 1).
-export([init_per_suite/1, end_per_suite/1,
receive_and_save_trace/2, send_trace/2]).
-export([all/0, suite/0,groups/0,init_per_group/2,end_per_group/2,
init_per_testcase/2, end_per_testcase/2]).
-export([live_node/1,
'sparc_sunos5.8_32b_emt2.0'/1,
'pc_win2000_32b_emt2.0'/1,
'pc.smp_linux2.2.19pre17_32b_emt2.0'/1,
'powerpc_darwin7.7.0_32b_emt2.0'/1,
'alpha_osf1v5.1_64b_emt2.0'/1,
'sparc_sunos5.8_64b_emt2.0'/1,
'sparc_sunos5.8_32b_emt1.0'/1,
'pc_win2000_32b_emt1.0'/1,
'powerpc_darwin7.7.0_32b_emt1.0'/1,
'alpha_osf1v5.1_64b_emt1.0'/1,
'sparc_sunos5.8_64b_emt1.0'/1]).
-include_lib("kernel/include/file.hrl").
-include_lib("test_server/include/test_server.hrl").
-define(DEFAULT_TIMEOUT, ?t:minutes(5)).
-define(EMEM_64_32_COMMENT,
"64 bit trace; this build of emem can only handle 32 bit traces").
-record(emem_res, {nodename,
hostname,
pid,
start_time,
trace_version,
max_word_size,
word_size,
last_values,
maximum,
exit_code}).
%%
%%
%% Exported suite functions
%%
%%
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
case is_debug_compiled() of
true -> {skip, "Not run when debug compiled"};
false -> test_cases()
end.
groups() ->
[].
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
test_cases() ->
[live_node, 'sparc_sunos5.8_32b_emt2.0',
'pc_win2000_32b_emt2.0',
'pc.smp_linux2.2.19pre17_32b_emt2.0',
'powerpc_darwin7.7.0_32b_emt2.0',
'alpha_osf1v5.1_64b_emt2.0',
'sparc_sunos5.8_64b_emt2.0',
'sparc_sunos5.8_32b_emt1.0', 'pc_win2000_32b_emt1.0',
'powerpc_darwin7.7.0_32b_emt1.0',
'alpha_osf1v5.1_64b_emt1.0',
'sparc_sunos5.8_64b_emt1.0'].
init_per_testcase(Case, Config) when is_list(Config) ->
case maybe_skip(Config) of
{skip, _}=Skip -> Skip;
ok ->
Dog = ?t:timetrap(?DEFAULT_TIMEOUT),
%% Until emem is completely stable we run these tests in a working
%% directory with an ignore_core_files file which will make the
%% search for core files ignore cores generated by this suite.
ignore_cores:setup(?MODULE,
Case,
[{watchdog, Dog}, {testcase, Case} | Config])
end.
end_per_testcase(_Case, Config) when is_list(Config) ->
ignore_cores:restore(Config),
Dog = ?config(watchdog, Config),
?t:timetrap_cancel(Dog),
ok.
maybe_skip(Config) ->
DataDir = ?config(data_dir, Config),
case filelib:is_dir(DataDir) of
false ->
{skip, "No data directory"};
true ->
case ?config(emem, Config) of
undefined ->
{skip, "emem not found"};
_ ->
ok
end
end.
init_per_suite(Config) when is_list(Config) ->
BinDir = filename:join([code:lib_dir(tools), "bin"]),
Target = erlang:system_info(system_architecture),
Res = (catch begin
case check_dir(filename:join([BinDir, Target])) of
not_found -> ok;
TDir ->
check_emem(TDir, purecov),
check_emem(TDir, purify),
check_emem(TDir, debug),
check_emem(TDir, opt)
end,
check_emem(BinDir, opt),
""
end),
Res ++ ignore_cores:init(Config).
end_per_suite(Config) when is_list(Config) ->
Config1 = lists:keydelete(emem, 1, Config),
Config2 = lists:keydelete(emem_comment, 1, Config1),
ignore_cores:fini(Config2).
%%
%%
%% Test cases
%%
%%
live_node(doc) -> [];
live_node(suite) -> [];
live_node(Config) when is_list(Config) ->
?line {ok, EmuFlag, Port} = start_emem(Config),
?line Nodename = mk_nodename(Config),
?line {ok, Node} = start_node(Nodename, EmuFlag),
?line NP = spawn(Node,
fun () ->
receive go -> ok end,
I = spawn(fun () -> ignorer end),
GC = fun () ->
GCP = fun (P) ->
garbage_collect(P)
end,
lists:foreach(GCP, processes())
end,
Seq = fun () -> I ! lists:seq(1, 1000000) end,
spawn_link(Seq),
B1 = <<0:10000000>>,
spawn_link(Seq),
B2 = <<0:10000000>>,
spawn_link(Seq),
B3 = <<0:10000000>>,
I ! {B1, B2, B3},
GC(),
GC(),
GC()
end),
?line MRef = erlang:monitor(process, NP),
NP ! go,
?line receive
{'DOWN', MRef, process, NP, Reason} ->
?line spawn(Node, fun () -> halt(17) end),
?line normal = Reason
end,
?line Res = get_emem_result(Port),
?line {ok, Hostname} = inet:gethostname(),
?line ShortHostname = short_hostname(Hostname),
?line {true, _} = has_prefix(Nodename, Res#emem_res.nodename),
?line ShortHostname = short_hostname(Res#emem_res.hostname),
?line Bits = case erlang:system_info(wordsize) of
4 -> ?line "32 bits";
8 -> ?line "64 bits"
end,
?line Bits = Res#emem_res.word_size,
?line "17" = Res#emem_res.exit_code,
?line emem_comment(Config).
'sparc_sunos5.8_32b_emt2.0'(doc) -> [];
'sparc_sunos5.8_32b_emt2.0'(suite) -> [];
'sparc_sunos5.8_32b_emt2.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "test_server" = Res#emem_res.nodename,
?line "gorbag" = Res#emem_res.hostname,
?line "17074" = Res#emem_res.pid,
?line "2005-01-14 17:28:37.881980" = Res#emem_res.start_time,
?line "2.0" = Res#emem_res.trace_version,
?line "32 bits" = Res#emem_res.word_size,
?line ["15",
"2665739", "8992", "548986", "16131", "539994",
"4334192", "1", "99", "15", "98",
"0", "0", "49", "0", "49"] = Res#emem_res.last_values,
?line ["5972061", "9662",
"7987824", "5",
"2375680", "3"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config).
'pc_win2000_32b_emt2.0'(doc) -> [];
'pc_win2000_32b_emt2.0'(suite) -> [];
'pc_win2000_32b_emt2.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "test_server" = Res#emem_res.nodename,
?line "E-788FCF5191B54" = Res#emem_res.hostname,
?line "504" = Res#emem_res.pid,
?line "2005-01-24 17:27:28.224000" = Res#emem_res.start_time,
?line "2.0" = Res#emem_res.trace_version,
?line "32 bits" = Res#emem_res.word_size,
?line ["11",
"2932575", "8615", "641087", "68924", "632472"]
= Res#emem_res.last_values,
?line ["5434206", "9285"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config).
'pc.smp_linux2.2.19pre17_32b_emt2.0'(doc) -> [];
'pc.smp_linux2.2.19pre17_32b_emt2.0'(suite) -> [];
'pc.smp_linux2.2.19pre17_32b_emt2.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "test_server" = Res#emem_res.nodename,
?line "four-roses" = Res#emem_res.hostname,
?line "20689" = Res#emem_res.pid,
?line "2005-01-20 13:11:26.143077" = Res#emem_res.start_time,
?line "2.0" = Res#emem_res.trace_version,
?line "32 bits" = Res#emem_res.word_size,
?line ["49",
"2901817", "9011", "521610", "10875", "512599",
"5392096", "2", "120", "10", "118",
"0", "0", "59", "0", "59"] = Res#emem_res.last_values,
?line ["6182918", "9681",
"9062112", "6",
"2322432", "3"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config).
'powerpc_darwin7.7.0_32b_emt2.0'(doc) -> [];
'powerpc_darwin7.7.0_32b_emt2.0'(suite) -> [];
'powerpc_darwin7.7.0_32b_emt2.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "test_server" = Res#emem_res.nodename,
?line "grima" = Res#emem_res.hostname,
?line "13021" = Res#emem_res.pid,
?line "2005-01-20 15:08:17.568668" = Res#emem_res.start_time,
?line "2.0" = Res#emem_res.trace_version,
?line "32 bits" = Res#emem_res.word_size,
?line ["9",
"2784323", "8641", "531105", "15893", "522464"]
= Res#emem_res.last_values,
?line ["6150376", "9311"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config).
'alpha_osf1v5.1_64b_emt2.0'(doc) -> [];
'alpha_osf1v5.1_64b_emt2.0'(suite) -> [];
'alpha_osf1v5.1_64b_emt2.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "test_server" = Res#emem_res.nodename,
?line "thorin" = Res#emem_res.hostname,
?line "224630" = Res#emem_res.pid,
?line "2005-01-20 22:38:01.299632" = Res#emem_res.start_time,
?line "2.0" = Res#emem_res.trace_version,
?line "64 bits" = Res#emem_res.word_size,
?line case Res#emem_res.max_word_size of
"32 bits" ->
?line emem_comment(Config, ?EMEM_64_32_COMMENT);
"64 bits" ->
?line ["22",
"6591992", "8625", "516785", "14805", "508160",
"11429184", "5", "127", "254", "122",
"0", "0", "61", "0", "61"] = Res#emem_res.last_values,
?line ["7041775", "9295",
"11593024", "7",
"2097152", "3"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config)
end.
'sparc_sunos5.8_64b_emt2.0'(doc) -> [];
'sparc_sunos5.8_64b_emt2.0'(suite) -> [];
'sparc_sunos5.8_64b_emt2.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "test_server" = Res#emem_res.nodename,
?line "gorbag" = Res#emem_res.hostname,
?line "10907" = Res#emem_res.pid,
?line "2005-01-20 13:48:34.677068" = Res#emem_res.start_time,
?line "2.0" = Res#emem_res.trace_version,
?line "64 bits" = Res#emem_res.word_size,
?line case Res#emem_res.max_word_size of
"32 bits" ->
?line emem_comment(Config, ?EMEM_64_32_COMMENT);
"64 bits" ->
?line ["16",
"5032887", "8657", "530635", "14316", "521978",
"8627140", "5", "139", "19", "134",
"0", "0", "67", "0", "67"] = Res#emem_res.last_values,
?line ["11695070", "9324",
"16360388", "10",
"4136960", "3"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config)
end.
'sparc_sunos5.8_32b_emt1.0'(doc) -> [];
'sparc_sunos5.8_32b_emt1.0'(suite) -> [];
'sparc_sunos5.8_32b_emt1.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "" = Res#emem_res.nodename,
?line "" = Res#emem_res.hostname,
?line "" = Res#emem_res.pid,
?line "" = Res#emem_res.start_time,
?line "1.0" = Res#emem_res.trace_version,
?line "32 bits" = Res#emem_res.word_size,
?line ["11",
"2558261", "8643", "560610", "15325", "551967"]
= Res#emem_res.last_values,
?line ["2791121", "9317"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config).
'pc_win2000_32b_emt1.0'(doc) -> [];
'pc_win2000_32b_emt1.0'(suite) -> [];
'pc_win2000_32b_emt1.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "" = Res#emem_res.nodename,
?line "" = Res#emem_res.hostname,
?line "" = Res#emem_res.pid,
?line "" = Res#emem_res.start_time,
?line "1.0" = Res#emem_res.trace_version,
?line "32 bits" = Res#emem_res.word_size,
?line ["6",
"2965248", "8614", "640897", "68903", "632283"]
= Res#emem_res.last_values,
?line ["3147090", "9283"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config).
'powerpc_darwin7.7.0_32b_emt1.0'(doc) -> [];
'powerpc_darwin7.7.0_32b_emt1.0'(suite) -> [];
'powerpc_darwin7.7.0_32b_emt1.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "" = Res#emem_res.nodename,
?line "" = Res#emem_res.hostname,
?line "" = Res#emem_res.pid,
?line "" = Res#emem_res.start_time,
?line "1.0" = Res#emem_res.trace_version,
?line "32 bits" = Res#emem_res.word_size,
?line ["8",
"2852991", "8608", "529662", "15875", "521054"]
= Res#emem_res.last_values,
?line ["3173335", "9278"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config).
'alpha_osf1v5.1_64b_emt1.0'(doc) -> [];
'alpha_osf1v5.1_64b_emt1.0'(suite) -> [];
'alpha_osf1v5.1_64b_emt1.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "" = Res#emem_res.nodename,
?line "" = Res#emem_res.hostname,
?line "" = Res#emem_res.pid,
?line "" = Res#emem_res.start_time,
?line "1.0" = Res#emem_res.trace_version,
?line "64 bits" = Res#emem_res.word_size,
?line case Res#emem_res.max_word_size of
"32 bits" ->
?line emem_comment(Config, ?EMEM_64_32_COMMENT);
"64 bits" ->
?line ["22",
"6820094", "8612", "515518", "14812", "506906"]
= Res#emem_res.last_values,
?line ["7292413", "9282"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config)
end.
'sparc_sunos5.8_64b_emt1.0'(doc) -> [];
'sparc_sunos5.8_64b_emt1.0'(suite) -> [];
'sparc_sunos5.8_64b_emt1.0'(Config) when is_list(Config) ->
?line Res = run_emem_on_casefile(Config),
?line "" = Res#emem_res.nodename,
?line "" = Res#emem_res.hostname,
?line "" = Res#emem_res.pid,
?line "" = Res#emem_res.start_time,
?line "1.0" = Res#emem_res.trace_version,
?line "64 bits" = Res#emem_res.word_size,
?line case Res#emem_res.max_word_size of
"32 bits" ->
?line emem_comment(Config, ?EMEM_64_32_COMMENT);
"64 bits" ->
?line ["15",
"4965746", "8234", "543940", "14443", "535706"]
= Res#emem_res.last_values,
?line ["11697645", "8908"] = Res#emem_res.maximum,
?line "0" = Res#emem_res.exit_code,
?line emem_comment(Config)
end.
%%
%%
%% Auxiliary functions
%%
%%
receive_and_save_trace(PortNumber, FileName) when is_integer(PortNumber),
is_list(FileName) ->
{ok, F} = file:open(FileName, [write, compressed]),
{ok, LS} = gen_tcp:listen(PortNumber, [inet, {reuseaddr,true}, binary]),
{ok, S} = gen_tcp:accept(LS),
gen_tcp:close(LS),
receive_loop(S,F).
receive_loop(Socket, File) ->
receive
{tcp, Socket, Data} ->
ok = file:write(File, Data),
receive_loop(Socket, File);
{tcp_closed, Socket} ->
file:close(File),
ok;
{tcp_error, Socket, Reason} ->
file:close(File),
{error, Reason}
end.
send_trace({Host, PortNumber}, FileName) when is_list(Host),
is_integer(PortNumber),
is_list(FileName) ->
?line {ok, F} = file:open(FileName, [read, compressed]),
?line {ok, S} = gen_tcp:connect(Host, PortNumber, [inet,{packet, 0}]),
?line send_loop(S, F);
send_trace(EmuFlag, FileName) when is_list(EmuFlag),
is_list(FileName) ->
?line ["+Mit", IpAddrStr, PortNoStr] = string:tokens(EmuFlag, " :"),
?line send_trace({IpAddrStr, list_to_integer(PortNoStr)}, FileName).
send_loop(Socket, File) ->
?line case file:read(File, 128) of
{ok, Data} ->
?line case gen_tcp:send(Socket, Data) of
ok -> ?line send_loop(Socket, File);
Error ->
?line gen_tcp:close(Socket),
?line file:close(File),
Error
end;
eof ->
?line gen_tcp:close(Socket),
?line file:close(File),
?line ok;
Error ->
?line gen_tcp:close(Socket),
?line file:close(File),
?line Error
end.
check_emem(Dir, Type) when is_atom(Type) ->
ExeSuffix = case ?t:os_type() of
{win32, _} -> ".exe";
_ -> ""
end,
TypeSuffix = case Type of
opt -> "";
_ -> "." ++ atom_to_list(Type)
end,
Emem = "emem" ++ TypeSuffix ++ ExeSuffix,
case check_file(filename:join([Dir, Emem])) of
not_found -> ok;
File ->
Comment = case Type of
opt -> "";
_ -> "[emem " ++ atom_to_list(Type) ++ " compiled]"
end,
throw([{emem, File}, {emem_comment, Comment}])
end.
check_dir(DirName) ->
case file:read_file_info(DirName) of
{ok, #file_info {type = directory, access = A}} when A == read;
A == read_write ->
DirName;
_ ->
not_found
end.
check_file(FileName) ->
case file:read_file_info(FileName) of
{ok, #file_info {type = regular, access = A}} when A == read;
A == read_write ->
?line FileName;
_ ->
?line not_found
end.
emem_comment(Config) when is_list(Config) ->
emem_comment(Config, "").
emem_comment(Config, ExtraComment)
when is_list(Config), is_list(ExtraComment) ->
case {?config(emem_comment, Config), ExtraComment} of
{"", ""} -> ?line ok;
{"", XC} -> ?line {comment, XC};
{EmemC, ""} -> ?line {comment, EmemC};
{EmemC, XC} -> ?line {comment, EmemC ++ " " ++ XC}
end.
run_emem_on_casefile(Config) ->
CaseName = atom_to_list(?config(testcase, Config)),
?line File = filename:join([?config(data_dir, Config), CaseName ++ ".gz"]),
?line case check_file(File) of
not_found ->
?line ?t:fail({error, {filenotfound, File}});
_ ->
?line ok
end,
?line {ok, EmuFlag, Port} = start_emem(Config),
?line Parent = self(),
?line Ref = make_ref(),
?line spawn_link(fun () ->
SRes = send_trace(EmuFlag, File),
Parent ! {Ref, SRes}
end),
?line Res = get_emem_result(Port),
?line receive
{Ref, ok} ->
?line ok;
{Ref, SendError} ->
?line ?t:format("Send result: ~p~n", [SendError])
end,
?line Res.
get_emem_result(Port) ->
?line {Res, LV} = get_emem_result(Port, {#emem_res{}, []}),
?line Res#emem_res{last_values = string:tokens(LV, " ")}.
get_emem_result(Port, {_EmemRes, _LastValues} = Res) ->
?line case get_emem_line(Port) of
eof ->
?line Res;
Line ->
?line get_emem_result(Port, parse_emem_line(Line, Res))
end.
parse_emem_main_header_footer_line(Line, {ER, LV} = Res) ->
%% Header
?line case has_prefix("> Nodename:", Line) of
{true, NN} ->
?line throw({ER#emem_res{nodename = strip(NN)}, LV});
false -> ?line ok
end,
?line case has_prefix("> Hostname:", Line) of
{true, HN} ->
?line throw({ER#emem_res{hostname = strip(HN)}, LV});
false -> ?line ok
end,
?line case has_prefix("> Pid:", Line) of
{true, P} ->
?line throw({ER#emem_res{pid = strip(P)}, LV});
false -> ?line ok
end,
?line case has_prefix("> Start time (UTC):", Line) of
{true, ST} ->
?line throw({ER#emem_res{start_time = strip(ST)}, LV});
false -> ?line ok
end,
?line case has_prefix("> Actual trace version:", Line) of
{true, TV} ->
?line throw({ER#emem_res{trace_version = strip(TV)}, LV});
false -> ?line ok
end,
?line case has_prefix("> Maximum trace word size:", Line) of
{true, MWS} ->
?line throw({ER#emem_res{max_word_size = strip(MWS)}, LV});
false -> ?line ok
end,
?line case has_prefix("> Actual trace word size:", Line) of
{true, WS} ->
?line throw({ER#emem_res{word_size = strip(WS)}, LV});
false -> ?line ok
end,
%% Footer
?line case has_prefix("> Maximum:", Line) of
{true, M} ->
?line throw({ER#emem_res{maximum = string:tokens(M," ")}, LV});
false -> ?line ok
end,
?line case has_prefix("> Emulator exited with code:", Line) of
{true, EC} ->
?line throw({ER#emem_res{exit_code = strip(EC)}, LV});
false -> ?line ok
end,
?line Res.
parse_emem_header_line(_Line, {_ER, _LV} = Res) ->
?line Res.
parse_emem_value_line(Line, {EmemRes, _OldLastValues}) ->
?line {EmemRes, Line}.
parse_emem_line("", Res) ->
?line Res;
parse_emem_line(Line, Res) ->
?line [Prefix | _] = Line,
case Prefix of
$> -> ?line catch parse_emem_main_header_footer_line(Line, Res);
$| -> ?line catch parse_emem_header_line(Line, Res);
_ -> ?line catch parse_emem_value_line(Line, Res)
end.
start_emem(Config) when is_list(Config) ->
?line Emem = ?config(emem, Config),
?line Cd = case ignore_cores:dir(Config) of
false -> [];
Dir -> [{cd, Dir}]
end,
?line case open_port({spawn, Emem ++ " -t -n -o -i 1"},
Cd ++ [{line, 1024}, eof]) of
Port when is_port(Port) -> ?line {ok, read_emu_flag(Port), Port};
Error -> ?line ?t:fail(Error)
end.
read_emu_flag(Port) ->
?line Line = case get_emem_line(Port) of
eof -> ?line ?t:fail(unexpected_end_of_file);
L -> ?line L
end,
?line case has_prefix("> Emulator command line argument:", Line) of
{true, EmuFlag} -> EmuFlag;
false -> ?line read_emu_flag(Port)
end.
get_emem_line(Port, Acc) ->
?line receive
{Port, {data, {eol, Data}}} ->
?line Res = case Acc of
[] -> ?line Data;
_ -> ?line lists:flatten([Acc|Data])
end,
?line ?t:format("~s", [Res]),
?line Res;
{Port, {data, {noeol, Data}}} ->
?line get_emem_line(Port, [Acc|Data]);
{Port, eof} ->
?line port_close(Port),
?line eof
end.
get_emem_line(Port) ->
?line get_emem_line(Port, []).
short_hostname([]) ->
[];
short_hostname([$.|_]) ->
[];
short_hostname([C|Cs]) ->
[C | short_hostname(Cs)].
has_prefix([], List) when is_list(List) ->
{true, List};
has_prefix([P|Xs], [P|Ys]) ->
has_prefix(Xs, Ys);
has_prefix(_, _) ->
false.
strip(Str) -> string:strip(Str).
mk_nodename(Config) ->
{A, B, C} = now(),
atom_to_list(?MODULE)
++ "-" ++ atom_to_list(?config(testcase, Config))
++ "-" ++ integer_to_list(A*1000000000000 + B*1000000 + C).
start_node(Name, Args) ->
?line Pa = filename:dirname(code:which(?MODULE)),
?line ?t:start_node(Name, peer, [{args, Args ++ " -pa " ++ Pa}]).
% stop_node(Node) ->
% ?t:stop_node(Node).
is_debug_compiled() ->
is_debug_compiled(erlang:system_info(system_version)).
is_debug_compiled([$d,$e,$b,$u,$g | _]) ->
true;
is_debug_compiled([ _, _, _, _]) ->
false;
is_debug_compiled([]) ->
false;
is_debug_compiled([_|Rest]) ->
is_debug_compiled(Rest).
