%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2001-2011. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
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%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% %CopyrightEnd%
%%
%%%----------------------------------------------------------------------
%%% File : erl_link_SUITE.erl
%%% Author : Rickard Green <[email protected]>
%%% Purpose : Test erlang links
%%% Created : 13 Dec 2001 by Rickard Green <[email protected]>
%%%----------------------------------------------------------------------
-module(erl_link_SUITE).
-author('[email protected]').
%-define(line_trace, 1).
-include_lib("test_server/include/test_server.hrl").
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2]).
% Test cases
-export([links/1,
dist_links/1,
monitor_nodes/1,
process_monitors/1,
dist_process_monitors/1,
busy_dist_port_monitor/1,
busy_dist_port_link/1,
otp_5772_link/1,
otp_5772_dist_link/1,
otp_5772_monitor/1,
otp_5772_dist_monitor/1,
otp_7946/1]).
-export([init_per_testcase/2, end_per_testcase/2]).
% Internal exports
-export([test_proc/0]).
-define(LINK_UNDEF, 0).
-define(LINK_PID, 1).
-define(LINK_NODE, 3).
% These are to be kept in sync with erl_monitors.h
-define(MON_ORIGIN, 1).
-define(MON_TARGET, 3).
-record(erl_link, {type = ?LINK_UNDEF,
pid = [],
targets = []}).
% This is to be kept in sync with erl_bif_info.c (make_monitor_list)
-record(erl_monitor, {
type, % MON_ORIGIN or MON_TARGET (1 or 3)
ref,
pid, % Process or nodename
name = [] % registered name or []
}).
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[links, dist_links, monitor_nodes, process_monitors,
dist_process_monitors, busy_dist_port_monitor,
busy_dist_port_link, otp_5772_link, otp_5772_dist_link,
otp_5772_monitor, otp_5772_dist_monitor, otp_7946].
groups() ->
[].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
catch erts_debug:set_internal_state(available_internal_state, false).
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
links(doc) -> ["Tests node local links"];
links(suite) -> [];
links(Config) when is_list(Config) ->
?line common_link_test(node(), node()),
?line true = link(self()),
?line [] = find_erl_link(self(), ?LINK_PID, self()),
?line true = unlink(self()),
?line ok.
dist_links(doc) -> ["Tests distributed links"];
dist_links(suite) -> [];
dist_links(Config) when is_list(Config) ->
?line [NodeName] = get_names(1, dist_link),
?line {ok, Node} = start_node(NodeName),
?line common_link_test(node(), Node),
?line TP4 = spawn(?MODULE, test_proc, []),
?line TP5 = spawn(?MODULE, test_proc, []),
?line TP6 = spawn(Node, ?MODULE, test_proc, []),
?line true = tp_call(TP6, fun() -> link(TP4) end),
?line check_link(TP4, TP6),
?line true = tp_call(TP5,
fun() ->
process_flag(trap_exit,true),
link(TP6)
end),
?line check_link(TP5, TP6),
?line rpc:cast(Node, erlang, halt, []),
?line wait_until(fun () -> ?line is_proc_dead(TP4) end),
?line check_unlink(TP4, TP6),
?line true = tp_call(TP5,
fun() ->
receive
{'EXIT', TP6, noconnection} ->
true
end
end),
?line check_unlink(TP5, TP6),
?line tp_cast(TP5, fun() -> exit(normal) end),
?line ok.
common_link_test(NodeA, NodeB) ->
?line TP1 = spawn(NodeA, ?MODULE, test_proc, []),
?line check_unlink(TP1, self()),
?line TP2 = tp_call(TP1,
fun () ->
spawn_link(NodeB, ?MODULE, test_proc, [])
end),
?line check_link(TP1, TP2),
?line true = tp_call(TP2, fun() -> unlink(TP1) end),
?line check_unlink(TP1, TP2),
?line true = tp_call(TP2, fun() -> link(TP1) end),
?line check_link(TP1, TP2),
?line false = tp_call(TP2, fun() -> process_flag(trap_exit, true) end),
?line tp_cast(TP1, fun () -> exit(died) end),
?line true = tp_call(TP2, fun() ->
receive
{'EXIT', TP1, died} ->
true
end
end),
?line check_unlink(TP1, TP2),
?line TP3 = tp_call(TP2,
fun () ->
spawn_link(NodeA, ?MODULE, test_proc, [])
end),
?line check_link(TP3, TP2),
?line tp_cast(TP2, fun() -> exit(died) end),
?line wait_until(fun () -> ?line is_proc_dead(TP3) end),
?line check_unlink(TP3, TP2),
?line ok.
monitor_nodes(doc) -> ["Tests monitor of nodes"];
monitor_nodes(suite) -> [];
monitor_nodes(Config) when is_list(Config) ->
?line [An, Bn, Cn, Dn] = get_names(4, dist_link),
?line {ok, A} = start_node(An),
?line {ok, B} = start_node(Bn),
?line C = list_to_atom(lists:concat([Cn, "@", hostname()])),
?line D = list_to_atom(lists:concat([Dn, "@", hostname()])),
?line 0 = no_of_monitor_node(self(), A),
?line 0 = no_of_monitor_node(self(), B),
?line monitor_node(A, true),
?line monitor_node(B, true),
?line monitor_node(D, true),
?line monitor_node(D, true),
%% Has been known to crash the emulator.
?line {memory,_} = process_info(self(), memory),
?line monitor_node(A, false),
?line monitor_node(B, true),
?line monitor_node(C, true),
?line monitor_node(C, false),
?line monitor_node(C, true),
?line monitor_node(B, true),
?line monitor_node(A, false),
?line monitor_node(B, true),
?line monitor_node(B, false),
?line monitor_node(A, true),
?line check_monitor_node(self(), A, 1),
?line check_monitor_node(self(), B, 3),
?line check_monitor_node(self(), C, 0),
?line check_monitor_node(self(), D, 0),
?line receive {nodedown, C} -> ok end,
?line receive {nodedown, C} -> ok end,
?line receive {nodedown, C} -> ok end,
?line receive {nodedown, D} -> ok end,
?line receive {nodedown, D} -> ok end,
?line stop_node(A),
?line receive {nodedown, A} -> ok end,
?line check_monitor_node(self(), A, 0),
?line check_monitor_node(self(), B, 3),
?line stop_node(B),
?line receive {nodedown, B} -> ok end,
?line receive {nodedown, B} -> ok end,
?line receive {nodedown, B} -> ok end,
?line check_monitor_node(self(), B, 0),
?line receive
{nodedown, X} ->
?line ?t:fail({unexpected_nodedown, X})
after 0 ->
?line ok
end,
?line ok.
process_monitors(doc) -> ["Tests node local process monitors"];
process_monitors(suite) -> [];
process_monitors(Config) when is_list(Config) ->
?line common_process_monitors(node(), node()),
?line Mon1 = erlang:monitor(process,self()),
?line [] = find_erl_monitor(self(), Mon1),
?line [Name] = get_names(1, process_monitors),
?line true = register(Name, self()),
?line Mon2 = erlang:monitor(process, Name),
?line [] = find_erl_monitor(self(), Mon2),
?line receive
{'DOWN', Mon1, _, _, _} = Msg ->
?line ?t:fail({unexpected_down_msg, Msg});
{'DOWN', Mon2, _, _, _} = Msg ->
?line ?t:fail({unexpected_down_msg, Msg})
after 500 ->
?line true = erlang:demonitor(Mon1),
?line true = erlang:demonitor(Mon2),
?line ok
end.
dist_process_monitors(doc) -> ["Tests distributed process monitors"];
dist_process_monitors(suite) -> [];
dist_process_monitors(Config) when is_list(Config) ->
?line [Name] = get_names(1,dist_process_monitors),
?line {ok, Node} = start_node(Name),
?line common_process_monitors(node(), Node),
?line TP1 = spawn(Node, ?MODULE, test_proc, []),
?line R1 = erlang:monitor(process, TP1),
?line TP1O = get_down_object(TP1, self()),
?line check_process_monitor(self(), TP1, R1),
?line tp_cast(TP1, fun () -> halt() end),
?line receive
{'DOWN',R1,process,TP1O,noconnection} ->
?line ok
end,
?line check_process_demonitor(self(), TP1, R1),
?line R2 = erlang:monitor(process, TP1),
?line receive
{'DOWN',R2,process,TP1O,noconnection} ->
?line ok
end,
?line check_process_demonitor(self(), TP1, R2),
?line ok.
common_process_monitors(NodeA, NodeB) ->
?line TP1 = spawn(NodeA, ?MODULE, test_proc, []),
?line TP2 = spawn(NodeB, ?MODULE, test_proc, []),
?line run_common_process_monitors(TP1, TP2),
?line TP3 = spawn(NodeA, ?MODULE, test_proc, []),
?line TP4 = spawn(NodeB, ?MODULE, test_proc, []),
?line [TP4N] = get_names(1, common_process_monitors),
?line true = tp_call(TP4, fun () -> register(TP4N,self()) end),
?line run_common_process_monitors(TP3,
case node() == node(TP4) of
true -> TP4N;
false -> {TP4N, node(TP4)}
end),
?line ok.
run_common_process_monitors(TP1, TP2) ->
?line R1 = tp_call(TP1, fun () -> erlang:monitor(process, TP2) end),
?line check_process_monitor(TP1, TP2, R1),
?line tp_call(TP2, fun () -> catch erlang:demonitor(R1) end),
?line check_process_monitor(TP1, TP2, R1),
?line true = tp_call(TP1, fun () -> erlang:demonitor(R1) end),
?line check_process_demonitor(TP1, TP2, R1),
?line R2 = tp_call(TP1, fun () -> erlang:monitor(process, TP2) end),
?line TP2O = get_down_object(TP2, TP1),
?line check_process_monitor(TP1, TP2, R2),
?line tp_cast(TP2, fun () -> exit(bye) end),
?line wait_until(fun () -> ?line is_proc_dead(TP2) end),
?line ok = tp_call(TP1, fun () ->
?line receive
{'DOWN',R2,process,TP2O,bye} ->
?line ok
end
end),
?line check_process_demonitor(TP1, TP2, R2),
?line R3 = tp_call(TP1, fun () -> erlang:monitor(process, TP2) end),
?line ok = tp_call(TP1, fun () ->
?line receive
{'DOWN',R3,process,TP2O,noproc} ->
?line ok
end
end),
?line check_process_demonitor(TP1, TP2, R3),
?line tp_cast(TP1, fun () -> exit(normal) end),
?line wait_until(fun () -> ?line is_proc_dead(TP1) end),
?line ok.
busy_dist_port_monitor(doc) -> ["Tests distributed monitor/2, demonitor/1, "
"and 'DOWN' message over busy distribution "
"port"];
busy_dist_port_monitor(suite) -> [];
busy_dist_port_monitor(Config) when is_list(Config) ->
?line Tracer = case os:getenv("TRACE_BUSY_DIST_PORT") of
"true" -> start_busy_dist_port_tracer();
_ -> false
end,
?line [An] = get_names(1, busy_dist_port_monitor),
?line {ok, A} = start_node(An),
?line TP1 = spawn(A, ?MODULE, test_proc, []),
%% Check monitor over busy port
?line M1 = suspend_on_busy_test(A,
"erlang:monitor(process, TP1)",
fun () -> erlang:monitor(process, TP1) end),
?line check_process_monitor(self(), TP1, M1),
%% Check demonitor over busy port
?line suspend_on_busy_test(A,
"erlang:demonitor(M1)",
fun () -> erlang:demonitor(M1) end),
?line check_process_demonitor(self(), TP1, M1),
%% Check down message over busy port
?line TP2 = spawn(?MODULE, test_proc, []),
?line M2 = tp_call(TP1, fun () -> erlang:monitor(process, TP2) end),
?line check_process_monitor(TP1, TP2, M2),
?line Ref = make_ref(),
?line Busy = make_busy(A, 1000),
?line receive after 100 -> ok end,
?line tp_cast(TP2, fun () -> exit(Ref) end),
?line receive after 100 -> ok end,
?line unmake_busy(Busy),
?line Ref = tp_call(TP1, fun () ->
receive
{'DOWN', M2, process, TP2, Ref} ->
Ref
end
end),
?line tp_cast(TP1, fun () -> exit(normal) end),
?line stop_node(A),
?line stop_busy_dist_port_tracer(Tracer),
?line ok.
busy_dist_port_link(doc) -> ["Tests distributed link/1, unlink/1, and 'EXIT'",
" message over busy distribution port"];
busy_dist_port_link(suite) -> [];
busy_dist_port_link(Config) when is_list(Config) ->
?line Tracer = case os:getenv("TRACE_BUSY_DIST_PORT") of
"true" -> start_busy_dist_port_tracer();
_ -> false
end,
?line [An] = get_names(1, busy_dist_port_link),
?line {ok, A} = start_node(An),
?line TP1 = spawn(A, ?MODULE, test_proc, []),
%% Check link over busy port
?line suspend_on_busy_test(A,
"link(TP1)",
fun () -> link(TP1) end),
?line check_link(self(), TP1),
%% Check unlink over busy port
?line suspend_on_busy_test(A,
"unlink(TP1)",
fun () -> unlink(TP1) end),
?line check_unlink(self(), TP1),
%% Check trap exit message over busy port
?line TP2 = spawn(?MODULE, test_proc, []),
?line ok = tp_call(TP1, fun () ->
process_flag(trap_exit, true),
link(TP2),
ok
end),
?line check_link(TP1, TP2),
?line Ref = make_ref(),
?line Busy = make_busy(A, 1000),
?line receive after 100 -> ok end,
?line tp_cast(TP2, fun () -> exit(Ref) end),
?line receive after 100 -> ok end,
?line unmake_busy(Busy),
?line Ref = tp_call(TP1, fun () ->
receive
{'EXIT', TP2, Ref} ->
Ref
end
end),
?line tp_cast(TP1, fun () -> exit(normal) end),
?line stop_node(A),
?line stop_busy_dist_port_tracer(Tracer),
?line ok.
otp_5772_link(doc) -> [];
otp_5772_link(suite) -> [];
otp_5772_link(Config) when is_list(Config) ->
?line otp_5772_link_test(node()).
otp_5772_dist_link(doc) -> [];
otp_5772_dist_link(suite) -> [];
otp_5772_dist_link(Config) when is_list(Config) ->
?line [An] = get_names(1, otp_5772_dist_link),
?line {ok, A} = start_node(An),
?line otp_5772_link_test(A),
?line stop_node(A).
otp_5772_link_test(Node) ->
?line Prio = process_flag(priority, high),
?line TE = process_flag(trap_exit, true),
?line TP1 = spawn_opt(Node, ?MODULE, test_proc, [],
[link, {priority, low}]),
exit(TP1, bang),
unlink(TP1),
?line receive
{'EXIT', TP1, _} ->
?line ok
after 0 ->
?line ok
end,
?line receive
{'EXIT', TP1, _} = Exit ->
?line ?t:fail({got_late_exit_message, Exit})
after 1000 ->
?line ok
end,
?line process_flag(trap_exit, TE),
?line process_flag(priority, Prio),
?line ok.
otp_5772_monitor(doc) -> [];
otp_5772_monitor(suite) -> [];
otp_5772_monitor(Config) when is_list(Config) ->
?line otp_5772_monitor_test(node()).
otp_5772_dist_monitor(doc) -> [];
otp_5772_dist_monitor(suite) -> [];
otp_5772_dist_monitor(Config) when is_list(Config) ->
?line [An] = get_names(1, otp_5772_dist_monitor),
?line {ok, A} = start_node(An),
?line otp_5772_monitor_test(A),
?line stop_node(A),
?line ok.
otp_5772_monitor_test(Node) ->
?line Prio = process_flag(priority, high),
?line TP1 = spawn_opt(Node, ?MODULE, test_proc, [], [{priority, low}]),
?line M1 = erlang:monitor(process, TP1),
?line exit(TP1, bang),
?line erlang:demonitor(M1),
?line receive
{'DOWN', M1, _, _, _} ->
?line ok
after 0 ->
?line ok
end,
?line receive
{'DOWN', M1, _, _, _} = Down ->
?line ?t:fail({got_late_down_message, Down})
after 1000 ->
?line ok
end,
?line process_flag(priority, Prio),
?line ok.
otp_7946(Config) when is_list(Config) ->
?line [NodeName] = get_names(1, otp_7946),
?line {ok, Node} = start_node(NodeName),
?line Proc = rpc:call(Node, erlang, whereis, [net_kernel]),
?line Mon = erlang:monitor(process, Proc),
?line rpc:cast(Node, erlang, halt, []),
?line receive {'DOWN', Mon, process, Proc , _} -> ok end,
?line {Linker, LMon} = spawn_monitor(fun () ->
link(Proc),
receive
after infinity -> ok
end
end),
?line receive
{'DOWN', LMon, process, Linker, Reason} ->
?line ?t:format("Reason=~p~n", [Reason]),
?line Reason = noconnection
end.
%%
%% -- Internal utils --------------------------------------------------------
%%
-define(BUSY_DATA_KEY, '__busy__port__data__').
-define(BUSY_DATA_SIZE, 1024*1024).
busy_data() ->
case get(?BUSY_DATA_KEY) of
undefined ->
set_busy_data([]);
Data ->
true = is_binary(Data),
true = size(Data) == ?BUSY_DATA_SIZE,
Data
end.
set_busy_data(SetData) ->
case get(?BUSY_DATA_KEY) of
undefined ->
Data = case SetData of
D when is_binary(D), size(D) == ?BUSY_DATA_SIZE ->
SetData;
_ ->
list_to_binary(lists:duplicate(?BUSY_DATA_SIZE, 253))
end,
put(?BUSY_DATA_KEY, Data),
Data;
OldData ->
OldData
end.
freeze_node(Node, MS) ->
Own = 500,
DoingIt = make_ref(),
Freezer = self(),
spawn_link(Node,
fun () ->
erts_debug:set_internal_state(available_internal_state,
true),
dport_send(Freezer, DoingIt),
receive after Own -> ok end,
erts_debug:set_internal_state(block, MS+Own)
end),
receive DoingIt -> ok end,
receive after Own -> ok end.
make_busy(Node, Time) when is_integer(Time) ->
Own = 500,
freeze_node(Node, Time+Own),
Data = busy_data(),
%% first make port busy
Pid = spawn_link(fun () ->
forever(fun () ->
dport_reg_send(Node,
'__noone__',
Data)
end)
end),
receive after Own -> ok end,
wait_until(fun () ->
case process_info(Pid, status) of
{status, suspended} -> true;
_ -> false
end
end),
%% then dist entry
make_busy(Node, [nosuspend], Data),
Pid.
make_busy(Node, Opts, Data) ->
case erlang:send({'__noone__', Node}, Data, Opts) of
nosuspend -> nosuspend;
_ -> make_busy(Node, Opts, Data)
end.
unmake_busy(Pid) ->
unlink(Pid),
exit(Pid, bang).
suspend_on_busy_test(Node, Doing, Fun) ->
Tester = self(),
DoIt = make_ref(),
Done = make_ref(),
Data = busy_data(),
spawn_link(fun () ->
set_busy_data(Data),
Busy = make_busy(Node, 1000),
Tester ! DoIt,
receive after 100 -> ok end,
Info = process_info(Tester, [status, current_function]),
unmake_busy(Busy),
?t:format("~p doing ~s: ~p~n", [Tester, Doing, Info]),
Tester ! {Done, Info}
end),
receive DoIt -> ok end,
Res = Fun(),
receive
{Done, MyInfo} ->
%% Don't match arity; it is different in
%% debug and optimized emulator
[{status, suspended},
{current_function, {erlang, bif_return_trap, _}}] = MyInfo,
ok
end,
Res.
% get_node(Name) when is_atom(Name) ->
% ?line node();
% get_node({Name, Node}) when is_atom(Name) ->
% ?line Node;
% get_node(NC) when is_pid(NC); is_port(NC); is_reference(NC) ->
% ?line node(NC).
get_down_object(Item, _) when is_pid(Item) ->
Item;
get_down_object({Name, Node} = Item, _) when is_atom(Name); is_atom(Node) ->
Item;
get_down_object(Item, Watcher) when is_atom(Item), is_pid(Watcher) ->
{Item, node(Watcher)};
get_down_object(Item, {_,Node}) when is_atom(Item), is_atom(Node) ->
{Item, Node};
get_down_object(Item, Watcher) when is_atom(Item), is_atom(Watcher) ->
{Item, node()}.
is_proc_dead(P) ->
case is_proc_alive(P) of
true -> false;
false -> true
end.
is_proc_alive(Pid) when is_pid(Pid), node(Pid) == node() ->
?line is_process_alive(Pid);
is_proc_alive(Name) when is_atom(Name) ->
?line case catch whereis(Name) of
Pid when is_pid(Pid) ->
?line is_proc_alive(Pid);
_ ->
?line false
end;
is_proc_alive({Name, Node}) when is_atom(Name), Node == node() ->
?line is_proc_alive(Name);
is_proc_alive(Proc) ->
?line is_remote_proc_alive(Proc).
is_remote_proc_alive({Name, Node}) when is_atom(Name), is_atom(Node) ->
?line is_remote_proc_alive(Name, Node);
is_remote_proc_alive(Pid) when is_pid(Pid) ->
?line is_remote_proc_alive(Pid, node(Pid));
is_remote_proc_alive(_) ->
?line false.
is_remote_proc_alive(PN, Node) ->
?line S = self(),
?line R = make_ref(),
?line monitor_node(Node, true),
?line _P = spawn(Node, fun () -> S ! {R, is_proc_alive(PN)} end),
?line receive
{R, Bool} ->
?line monitor_node(Node, false),
?line Bool;
{nodedown, Node} ->
?line false
end.
wait_until(Fun) ->
?line case Fun() of
true ->
?line ok;
_ ->
?line receive
after 100 ->
?line wait_until(Fun)
end
end.
forever(Fun) ->
Fun(),
forever(Fun).
init_per_testcase(Func, Config) when is_atom(Func), is_list(Config) ->
?line Dog = ?t:timetrap(?t:minutes(1)),
case catch erts_debug:get_internal_state(available_internal_state) of
true -> ok;
_ -> erts_debug:set_internal_state(available_internal_state, true)
end,
?line [{watchdog, Dog}|Config].
end_per_testcase(_Func, Config) ->
?line Dog = ?config(watchdog, Config),
?line ?t:timetrap_cancel(Dog).
tp_call(Tp, Fun) ->
?line R = make_ref(),
?line Tp ! {call, self(), R, Fun},
?line receive
{R, Res} ->
?line Res
end.
tp_cast(Tp, Fun) ->
?line Tp ! {cast, Fun}.
test_proc() ->
?line receive
{call, From, Ref, Fun} ->
?line From ! {Ref, Fun()};
{cast, Fun} ->
?line Fun()
end,
?line test_proc().
expand_link_list([#erl_link{type = ?LINK_NODE, targets = N} = Rec | T]) ->
lists:duplicate(N,Rec#erl_link{targets = []}) ++ expand_link_list(T);
expand_link_list([#erl_link{targets = [#erl_link{pid = Pid}]} = Rec | T]) ->
[Rec#erl_link{targets = [Pid]} | expand_link_list(T)];
expand_link_list([#erl_link{targets = [#erl_link{pid = Pid}|TT]} = Rec | T]) ->
[ Rec#erl_link{targets = [Pid]} | expand_link_list(
[Rec#erl_link{targets = TT} | T])];
expand_link_list([#erl_link{targets = []} = Rec | T]) ->
[Rec | expand_link_list(T)];
expand_link_list([]) ->
[].
get_local_link_list(Obj) ->
case catch erts_debug:get_internal_state({link_list, Obj}) of
LL when is_list(LL) ->
expand_link_list(LL);
_ ->
[]
end.
get_remote_link_list(Node, Obj) ->
case catch rpc:call(Node, erts_debug, get_internal_state,
[{link_list, Obj}]) of
LL when is_list(LL) ->
expand_link_list(LL);
_ ->
[]
end.
get_link_list({Node, DistEntry}) when Node == node(), is_atom(DistEntry) ->
get_local_link_list(DistEntry);
get_link_list({Node, DistEntry}) when is_atom(Node), is_atom(DistEntry) ->
get_remote_link_list(Node, DistEntry);
get_link_list(P) when is_pid(P); is_port(P) ->
case node(P) of
Node when Node == node() ->
get_local_link_list(P);
Node ->
get_remote_link_list(Node, P)
end;
get_link_list(undefined) ->
[].
get_local_monitor_list(Obj) ->
case catch erts_debug:get_internal_state({monitor_list, Obj}) of
LL when is_list(LL) ->
LL;
_ ->
[]
end.
get_remote_monitor_list(Node, Obj) ->
case catch rpc:call(Node, erts_debug, get_internal_state,
[{monitor_list, Obj}]) of
LL when is_list(LL) ->
LL;
_ ->
[]
end.
get_monitor_list({Node, DistEntry}) when Node == node(), is_atom(DistEntry) ->
get_local_monitor_list(DistEntry);
get_monitor_list({Node, DistEntry}) when is_atom(Node), is_atom(DistEntry) ->
get_remote_monitor_list(Node, DistEntry);
get_monitor_list(P) when is_pid(P) ->
case node(P) of
Node when Node == node() ->
get_local_monitor_list(P);
Node ->
get_remote_monitor_list(Node, P)
end;
get_monitor_list(undefined) ->
[].
find_erl_monitor(Pid, Ref) when is_reference(Ref) ->
lists:foldl(fun (#erl_monitor{ref = R} = EL, Acc) when R == Ref ->
[EL|Acc];
(_, Acc) ->
Acc
end,
[],
get_monitor_list(Pid)).
% find_erl_link(Obj, Ref) when is_reference(Ref) ->
% ?line lists:foldl(fun (#erl_link{ref = R} = EL, Acc) when R == Ref ->
% ?line [EL|Acc];
% (_, Acc) ->
% ?line Acc
% end,
% [],
% get_link_list(Obj)).
find_erl_link(Obj, Type, [Item, Data]) when is_pid(Item);
is_port(Item);
is_atom(Item) ->
lists:foldl(fun (#erl_link{type = T, pid = I, targets = D} = EL,
Acc) when T == Type, I == Item ->
case Data of
D ->
[EL|Acc];
[] ->
[EL|Acc];
_ ->
Acc
end;
(_, Acc) ->
Acc
end,
[],
get_link_list(Obj));
find_erl_link(Obj, Type, Item) when is_pid(Item); is_port(Item); is_atom(Item) ->
find_erl_link(Obj, Type, [Item, []]).
check_link(A, B) ->
?line [#erl_link{type = ?LINK_PID,
pid = B,
targets = []}] = find_erl_link(A, ?LINK_PID, B),
?line [#erl_link{type = ?LINK_PID,
pid = A,
targets = []}] = find_erl_link(B, ?LINK_PID, A),
?line case node(A) == node(B) of
false ->
?line [#erl_link{type = ?LINK_PID,
pid = A,
targets = [B]}] = find_erl_link({node(A),
node(B)},
?LINK_PID,
[A, [B]]),
?line [#erl_link{type = ?LINK_PID,
pid = B,
targets = [A]}] = find_erl_link({node(B),
node(A)},
?LINK_PID,
[B, [A]]);
true ->
?line [] = find_erl_link({node(A), node(B)},
?LINK_PID,
[A, [B]]),
?line [] = find_erl_link({node(B), node(A)},
?LINK_PID,
[B, [A]])
end,
?line ok.
check_unlink(A, B) ->
?line [] = find_erl_link(A, ?LINK_PID, B),
?line [] = find_erl_link(B, ?LINK_PID, A),
?line [] = find_erl_link({node(A), node(B)}, ?LINK_PID, [A, [B]]),
?line [] = find_erl_link({node(B), node(A)}, ?LINK_PID, [B, [A]]),
?line ok.
check_process_monitor(From, {Name, Node}, Ref) when is_pid(From),
is_atom(Name),
Node == node(From),
is_reference(Ref) ->
?line check_process_monitor(From, Name, Ref);
check_process_monitor(From, {Name, Node}, Ref) when is_pid(From),
is_atom(Name),
is_atom(Node),
is_reference(Ref) ->
?line MonitoredPid = rpc:call(Node, erlang, whereis, [Name]),
?line [#erl_monitor{type = ?MON_ORIGIN,
ref = Ref,
pid = Node,
name = Name}] = find_erl_monitor(From, Ref),
?line [#erl_monitor{type = ?MON_TARGET,
ref = Ref,
pid = From,
name = Name}] = find_erl_monitor({node(From), Node}, Ref),
?line [#erl_monitor{type = ?MON_ORIGIN,
ref = Ref,
pid = MonitoredPid,
name = Name}] = find_erl_monitor({Node, node(From)}, Ref),
?line [#erl_monitor{type = ?MON_TARGET,
ref = Ref,
pid = From,
name = Name}] = find_erl_monitor(MonitoredPid, Ref),
?line ok;
check_process_monitor(From, Name, Ref) when is_pid(From),
is_atom(Name),
undefined /= Name,
is_reference(Ref) ->
?line MonitoredPid = rpc:call(node(From), erlang, whereis, [Name]),
?line [#erl_monitor{type = ?MON_ORIGIN,
ref = Ref,
pid = MonitoredPid,
name = Name}] = find_erl_monitor(From, Ref),
?line [#erl_monitor{type = ?MON_TARGET,
ref = Ref,
pid = From,
name = Name}] = find_erl_monitor(MonitoredPid,Ref),
ok;
check_process_monitor(From, To, Ref) when is_pid(From),
is_pid(To),
is_reference(Ref) ->
?line OriMon = [#erl_monitor{type = ?MON_ORIGIN,
ref = Ref,
pid = To}],
?line OriMon = find_erl_monitor(From, Ref),
?line TargMon = [#erl_monitor{type = ?MON_TARGET,
ref = Ref,
pid = From}],
?line TargMon = find_erl_monitor(To, Ref),
?line case node(From) == node(To) of
false ->
?line TargMon = find_erl_monitor({node(From), node(To)}, Ref),
?line OriMon = find_erl_monitor({node(To), node(From)}, Ref);
true ->
?line [] = find_erl_monitor({node(From), node(From)}, Ref)
end,
?line ok.
check_process_demonitor(From, {undefined, Node}, Ref) when is_pid(From),
is_reference(Ref) ->
?line [] = find_erl_monitor(From, Ref),
?line case node(From) == Node of
false ->
?line [] = find_erl_monitor({node(From), Node}, Ref),
?line [] = find_erl_monitor({Node, node(From)}, Ref);
true ->
?line [] = find_erl_monitor({Node, Node}, Ref)
end,
?line ok;
check_process_demonitor(From, {Name, Node}, Ref) when is_pid(From),
is_atom(Name),
Node == node(From),
is_reference(Ref) ->
?line MonitoredPid = rpc:call(Node, erlang, whereis, [Name]),
?line case rpc:call(Node, erlang, whereis, [Name]) of
undefined ->
?line check_process_demonitor(From, {undefined, Node}, Ref);
MonitoredPid ->
?line check_process_demonitor(From, MonitoredPid, Ref)
end;
check_process_demonitor(From, {Name, Node}, Ref) when is_pid(From),
is_atom(Name),
is_atom(Node),
is_reference(Ref) ->
?line MonitoredPid = rpc:call(Node, erlang, whereis, [Name]),
?line [] = find_erl_monitor(From, Ref),
?line [] = find_erl_monitor({node(From), Node}, Ref),
?line [] = find_erl_monitor({Node, node(From)}, Ref),
?line [] = find_erl_monitor(MonitoredPid, Ref),
?line ok;
check_process_demonitor(From, undefined, Ref) when is_pid(From),
is_reference(Ref) ->
?line [] = find_erl_monitor(From, Ref),
?line case node(From) == node() of
false ->
?line [] = find_erl_monitor({node(From), node()}, Ref),
?line [] = find_erl_monitor({node(), node(From)}, Ref);
true ->
?line [] = find_erl_monitor({node(), node()}, Ref)
end,
?line ok;
check_process_demonitor(From, Name, Ref) when is_pid(From),
is_atom(Name),
undefined /= Name,
is_reference(Ref) ->
?line check_process_demonitor(From, {Name, node()}, Ref);
check_process_demonitor(From, To, Ref) when is_pid(From),
is_pid(To),
is_reference(Ref) ->
?line [] = find_erl_monitor(From, Ref),
?line [] = find_erl_monitor(To, Ref),
?line case node(From) == node(To) of
false ->
?line [] = find_erl_monitor({node(From), node(To)}, Ref),
?line [] = find_erl_monitor({node(To), node(From)}, Ref);
true ->
?line [] = find_erl_monitor({node(From), node(From)}, Ref)
end,
?line ok.
no_of_monitor_node(From, Node) when is_pid(From), is_atom(Node) ->
?line length(find_erl_link(From, ?LINK_NODE, Node)).
check_monitor_node(From, Node, No) when is_pid(From),
is_atom(Node),
is_integer(No),
No >= 0 ->
?line LL = lists:duplicate(No, #erl_link{type = ?LINK_NODE, pid = Node}),
?line DLL = lists:duplicate(No, #erl_link{type = ?LINK_NODE, pid = From}),
?line LL = find_erl_link(From, ?LINK_NODE, Node),
?line DLL = find_erl_link({node(From), Node}, ?LINK_NODE, From),
?line ok.
hostname() ->
?line from($@, atom_to_list(node())).
from(H, [H | T]) -> T;
from(H, [_ | T]) -> from(H, T);
from(_H, []) -> [].
get_names(N, T) when is_atom(T) ->
get_names(N, T, []).
get_names(0, _, Acc) ->
Acc;
get_names(N, T, Acc) ->
get_names(N-1, T, [list_to_atom(atom_to_list(?MODULE)
++ "-"
++ atom_to_list(T)
++ "-"
++ integer_to_list(erlang:system_time(seconds))
++ "-"
++ integer_to_list(erlang:unique_integer([positive]))) | Acc]).
start_node(Name) ->
?line start_node(Name, "").
start_node(Name, Args) ->
?line Pa = filename:dirname(code:which(?MODULE)),
?line Res = ?t:start_node(Name, slave, [{args, Args ++ " -pa " ++ Pa}]),
?line {ok, Node} = Res,
?line rpc:call(Node, erts_debug, set_internal_state,
[available_internal_state, true]),
?line Res.
stop_node(Node) ->
?line ?t:stop_node(Node).
-define(COOKIE, '').
-define(DOP_LINK, 1).
-define(DOP_SEND, 2).
-define(DOP_EXIT, 3).
-define(DOP_UNLINK, 4).
-define(DOP_REG_SEND, 6).
-define(DOP_GROUP_LEADER, 7).
-define(DOP_EXIT2, 8).
-define(DOP_SEND_TT, 12).
-define(DOP_EXIT_TT, 13).
-define(DOP_REG_SEND_TT, 16).
-define(DOP_EXIT2_TT, 18).
-define(DOP_MONITOR_P, 19).
-define(DOP_DEMONITOR_P, 20).
-define(DOP_MONITOR_P_EXIT, 21).
dport_send(To, Msg) ->
Node = node(To),
DPrt = case dport(Node) of
undefined ->
pong = net_adm:ping(Node),
dport(Node);
Prt ->
Prt
end,
port_command(DPrt, [dmsg_hdr(),
dmsg_ext({?DOP_SEND,
?COOKIE,
To}),
dmsg_ext(Msg)]).
dport_reg_send(Node, Name, Msg) ->
DPrt = case dport(Node) of
undefined ->
pong = net_adm:ping(Node),
dport(Node);
Prt ->
Prt
end,
port_command(DPrt, [dmsg_hdr(),
dmsg_ext({?DOP_REG_SEND,
self(),
?COOKIE,
Name}),
dmsg_ext(Msg)]).
dport(Node) when is_atom(Node) ->
case catch erts_debug:get_internal_state(available_internal_state) of
true -> true;
_ -> erts_debug:set_internal_state(available_internal_state, true)
end,
erts_debug:get_internal_state({dist_port, Node}).
dmsg_hdr() ->
[131, % Version Magic
$D, % Dist header
0]. % No atom cache referenses
dmsg_ext(Term) ->
<<131, Res/binary>> = term_to_binary(Term),
Res.
start_busy_dist_port_tracer() ->
Tracer = spawn_link(fun () -> busy_dist_port_tracer() end),
erlang:system_monitor(Tracer, [busy_dist_port]),
Tracer.
stop_busy_dist_port_tracer(Tracer) when is_pid(Tracer) ->
unlink(Tracer),
exit(Tracer, bye);
stop_busy_dist_port_tracer(_) ->
true.
busy_dist_port_tracer() ->
receive
{monitor, _SuspendedProcess, busy_dist_port, _Port} = M ->
erlang:display(M),
busy_dist_port_tracer()
end.
