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authorBjörn-Egil Dahlberg <[email protected]>2016-03-18 19:40:35 +0100
committerBjörn-Egil Dahlberg <[email protected]>2016-04-06 17:23:57 +0200
commit9e3dd3743153e79583c876809af8e16ab582f185 (patch)
treee5b71f256db43a09de452a14f117010a87c72487 /erts
parent84f2e9b3b1bb3990a7bea7b9d45768ee1a820804 (diff)
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Add lttng testcases
Diffstat (limited to 'erts')
-rw-r--r--erts/emulator/test/Makefile1
-rw-r--r--erts/emulator/test/lttng_SUITE.erl499
-rw-r--r--erts/emulator/test/lttng_SUITE_data/Makefile.src7
-rw-r--r--erts/emulator/test/lttng_SUITE_data/caller_drv.c159
4 files changed, 666 insertions, 0 deletions
diff --git a/erts/emulator/test/Makefile b/erts/emulator/test/Makefile
index 318db4b45e..0f716c11a1 100644
--- a/erts/emulator/test/Makefile
+++ b/erts/emulator/test/Makefile
@@ -70,6 +70,7 @@ MODULES= \
hash_SUITE \
hibernate_SUITE \
list_bif_SUITE \
+ lttng_SUITE \
map_SUITE \
match_spec_SUITE \
module_info_SUITE \
diff --git a/erts/emulator/test/lttng_SUITE.erl b/erts/emulator/test/lttng_SUITE.erl
new file mode 100644
index 0000000000..d0f6292d5b
--- /dev/null
+++ b/erts/emulator/test/lttng_SUITE.erl
@@ -0,0 +1,499 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1999-2011. 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
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-module(lttng_SUITE).
+
+-export([all/0, suite/0]).
+-export([init_per_suite/1, end_per_suite/1]).
+-export([init_per_testcase/2, end_per_testcase/2]).
+
+-export([t_lttng_list/1,
+ t_carrier_pool/1,
+ t_memory_carrier/1,
+ t_async_io_pool/1,
+ t_driver_control_ready_async/1,
+ t_driver_start_stop/1,
+ t_driver_ready_input_output/1,
+ t_driver_timeout/1,
+ t_driver_caller/1,
+ t_driver_flush/1,
+ t_scheduler_poll/1]).
+
+-include_lib("common_test/include/ct.hrl").
+
+suite() ->
+ [{ct_hooks,[ts_install_cth]},
+ {timetrap, {seconds, 10}}].
+
+all() ->
+ [t_lttng_list,
+ t_carrier_pool,
+ t_async_io_pool,
+ t_driver_start_stop,
+ t_driver_ready_input_output,
+ t_driver_control_ready_async,
+ t_driver_timeout,
+ t_driver_caller,
+ t_driver_flush,
+ t_scheduler_poll,
+ t_memory_carrier].
+
+
+init_per_suite(Config) ->
+ case erlang:system_info(dynamic_trace) of
+ lttng ->
+ ensure_lttng_stopped("--all"),
+ Config;
+ _ ->
+ {skip, "No LTTng configured on system."}
+ end.
+
+end_per_suite(_Config) ->
+ ensure_lttng_stopped("--all"),
+ ok.
+
+init_per_testcase(Case, Config) ->
+ Name = atom_to_list(Case),
+ ok = ensure_lttng_started(Name, Config),
+ [{session, Name}|Config].
+
+end_per_testcase(Case, _Config) ->
+ Name = atom_to_list(Case),
+ ok = ensure_lttng_stopped(Name),
+ ok.
+
+%% Not tested yet
+%% com_ericsson_otp:driver_process_exit
+%% com_ericsson_otp:driver_event
+
+%% tracepoints
+%%
+%% com_ericsson_otp:carrier_pool_get
+%% com_ericsson_otp:carrier_pool_put
+%% com_ericsson_otp:carrier_destroy
+%% com_ericsson_otp:carrier_create
+%% com_ericsson_otp:aio_pool_add
+%% com_ericsson_otp:aio_pool_get
+%% com_ericsson_otp:driver_control
+%% com_ericsson_otp:driver_call
+%% com_ericsson_otp:driver_finish
+%% com_ericsson_otp:driver_ready_async
+%% com_ericsson_otp:driver_process_exit
+%% com_ericsson_otp:driver_stop
+%% com_ericsson_otp:driver_flush
+%% com_ericsson_otp:driver_stop_select
+%% com_ericsson_otp:driver_timeout
+%% com_ericsson_otp:driver_event
+%% com_ericsson_otp:driver_ready_output
+%% com_ericsson_otp:driver_ready_input
+%% com_ericsson_otp:driver_output
+%% com_ericsson_otp:driver_outputv
+%% com_ericsson_otp:driver_init
+%% com_ericsson_otp:driver_start
+%% com_ericsson_otp:scheduler_poll
+
+%%
+%% Testcases
+%%
+
+t_lttng_list(_Config) ->
+ {ok, _} = cmd("lttng list -u"),
+ ok.
+
+%% com_ericsson_otp:carrier_pool_get
+%% com_ericsson_otp:carrier_pool_put
+t_carrier_pool(Config) ->
+ case have_carriers() of
+ false ->
+ {skip, "No Memory Carriers configured on system."};
+ true ->
+ ok = lttng_start_event("com_ericsson_otp:carrier_pool*", Config),
+
+ ok = ets_load(),
+
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:carrier_pool_get", Res),
+ ok = check_tracepoint("com_ericsson_otp:carrier_pool_put", Res),
+ ok
+ end.
+
+%% com_ericsson_otp:carrier_destroy
+%% com_ericsson_otp:carrier_create
+t_memory_carrier(Config) ->
+ case have_carriers() of
+ false ->
+ {skip, "No Memory Carriers configured on system."};
+ true ->
+ ok = lttng_start_event("com_ericsson_otp:carrier_*", Config),
+
+ ok = ets_load(),
+
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:carrier_destroy", Res),
+ ok = check_tracepoint("com_ericsson_otp:carrier_create", Res),
+ ok
+ end.
+
+%% com_ericsson_otp:aio_pool_add
+%% com_ericsson_otp:aio_pool_get
+t_async_io_pool(Config) ->
+ case have_async_threads() of
+ false ->
+ {skip, "No Async Threads configured on system."};
+ true ->
+ ok = lttng_start_event("com_ericsson_otp:aio_pool_*", Config),
+
+ Path1 = proplists:get_value(priv_dir, Config),
+ {ok, [[Path2]]} = init:get_argument(home),
+ {ok, _} = file:list_dir(Path1),
+ {ok, _} = file:list_dir(Path2),
+ {ok, _} = file:list_dir(Path1),
+ {ok, _} = file:list_dir(Path2),
+
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:aio_pool_add", Res),
+ ok = check_tracepoint("com_ericsson_otp:aio_pool_get", Res),
+ ok
+ end.
+
+
+%% com_ericsson_otp:driver_start
+%% com_ericsson_otp:driver_stop
+t_driver_start_stop(Config) ->
+ ok = lttng_start_event("com_ericsson_otp:driver_*", Config),
+ Path = proplists:get_value(priv_dir, Config),
+ Name = filename:join(Path, "sometext.txt"),
+ Bin = txt(),
+ ok = file:write_file(Name, Bin),
+ {ok, Bin} = file:read_file(Name),
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:driver_start", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_stop", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_control", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_outputv", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_ready_async", Res),
+ ok.
+
+%% com_ericsson_otp:driver_control
+%% com_ericsson_otp:driver_outputv
+%% com_ericsson_otp:driver_ready_async
+t_driver_control_ready_async(Config) ->
+ ok = lttng_start_event("com_ericsson_otp:driver_control", Config),
+ ok = lttng_start_event("com_ericsson_otp:driver_outputv", Config),
+ ok = lttng_start_event("com_ericsson_otp:driver_ready_async", Config),
+ Path = proplists:get_value(priv_dir, Config),
+ Name = filename:join(Path, "sometext.txt"),
+ Bin = txt(),
+ ok = file:write_file(Name, Bin),
+ {ok, Bin} = file:read_file(Name),
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:driver_control", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_outputv", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_ready_async", Res),
+ ok.
+
+%% com_ericsson_otp:driver_ready_input
+%% com_ericsson_otp:driver_ready_output
+t_driver_ready_input_output(Config) ->
+ ok = lttng_start_event("com_ericsson_otp:driver_ready_*", Config),
+ Me = self(),
+ Pid = spawn_link(fun() -> tcp_server(Me, active) end),
+ receive {Pid, accept} -> ok end,
+ Bin = txt(),
+ Sz = byte_size(Bin),
+
+ {ok, Sock} = gen_tcp:connect("localhost", 5679, [binary, {packet, 2}]),
+ ok = gen_tcp:send(Sock, <<Sz:16, Bin/binary>>),
+ ok = gen_tcp:send(Sock, <<Sz:16, Bin/binary>>),
+ ok = gen_tcp:close(Sock),
+ receive {Pid, done} -> ok end,
+
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:driver_ready_input", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_ready_output", Res),
+ ok.
+
+
+%% com_ericsson_otp:driver_stop_select
+%% com_ericsson_otp:driver_timeout
+t_driver_timeout(Config) ->
+ ok = lttng_start_event("com_ericsson_otp:driver_*", Config),
+ Me = self(),
+ Pid = spawn_link(fun() -> tcp_server(Me, timeout) end),
+ receive {Pid, accept} -> ok end,
+ {ok, Sock} = gen_tcp:connect("localhost", 5679, [binary]),
+ ok = gen_tcp:send(Sock, <<"hej">>),
+ receive {Pid, done} -> ok end,
+ ok = gen_tcp:close(Sock),
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:driver_timeout", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_stop_select", Res),
+ ok.
+
+%% com_ericsson_otp:driver_call
+%% com_ericsson_otp:driver_output
+%% com_ericsson_otp:driver_init
+%% com_ericsson_otp:driver_finish
+t_driver_caller(Config) ->
+ ok = lttng_start_event("com_ericsson_otp:driver_*", Config),
+
+ Drv = 'caller_drv',
+ os:putenv("CALLER_DRV_USE_OUTPUTV", "false"),
+
+ ok = load_driver(proplists:get_value(data_dir, Config), Drv),
+ Port = open_port({spawn, Drv}, []),
+ true = is_port(Port),
+
+ chk_caller(Port, start, self()),
+ chk_caller(Port, output, spawn_link(fun() ->
+ port_command(Port, "")
+ end)),
+ Port ! {self(), {command, ""}},
+ chk_caller(Port, output, self()),
+ chk_caller(Port, control, spawn_link(fun () ->
+ port_control(Port, 0, "")
+ end)),
+ chk_caller(Port, call, spawn_link(fun() ->
+ erlang:port_call(Port, 0, "")
+ end)),
+
+ true = port_close(Port),
+ erl_ddll:unload_driver(Drv),
+
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:driver_call", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_output", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_init", Res),
+ ok = check_tracepoint("com_ericsson_otp:driver_finish", Res),
+ ok.
+
+%% com_ericsson_otp:scheduler_poll
+t_scheduler_poll(Config) ->
+ ok = lttng_start_event("com_ericsson_otp:scheduler_poll", Config),
+
+ ok = memory_load(),
+
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:scheduler_poll", Res),
+ ok.
+
+%% com_ericsson_otp:driver_flush
+t_driver_flush(Config) ->
+ ok = lttng_start_event("com_ericsson_otp:driver_flush", Config),
+
+ Me = self(),
+ Pid = spawn_link(fun() -> tcp_server(Me, passive_no_read) end),
+ receive {Pid, accept} -> ok end,
+ Bin = iolist_to_binary([txt() || _ <- lists:seq(1,100)]),
+ Sz = byte_size(Bin),
+
+ %% We want to create a scenario where sendings stalls and we
+ %% queue packets in the driver.
+ %% When we close the socket it has to flush the queue.
+ {ok, Sock} = gen_tcp:connect("localhost", 5679, [binary, {packet, 2},
+ {send_timeout, 10},
+ {sndbuf, 10000000}]),
+ Pids = [spawn_link(fun() ->
+ gen_tcp:send(Sock, <<Sz:16, Bin/binary>>),
+ Me ! {self(), ok}
+ end) || _ <- lists:seq(1,100)],
+ [receive {P, ok} -> ok end || P <- Pids],
+ ok = gen_tcp:close(Sock),
+ Pid ! die,
+ receive {Pid, done} -> ok end,
+
+ Res = lttng_stop_and_view(Config),
+ ok = check_tracepoint("com_ericsson_otp:driver_flush", Res),
+ ok.
+
+%%
+%% AUX
+%%
+
+chk_caller(Port, Callback, ExpectedCaller) ->
+ receive
+ {caller, Port, Callback, Caller} ->
+ ExpectedCaller = Caller
+ end.
+
+
+ets_load() ->
+ Tid = ets:new(ets_load, [public,set]),
+ N = erlang:system_info(schedulers_online),
+ Pids = [spawn_link(fun() -> ets_shuffle(Tid) end) || _ <- lists:seq(1,N)],
+ ok = ets_kill(Pids, 500),
+ ok.
+
+
+ets_kill([], _) -> ok;
+ets_kill([Pid|Pids], Time) ->
+ timer:sleep(Time),
+ Pid ! done,
+ ets_kill(Pids, Time).
+
+ets_shuffle(Tid) ->
+ Payload = lists:duplicate(100, $x),
+ ets_shuffle(Tid, 100, Payload).
+ets_shuffle(Tid, I, Data) ->
+ ets_shuffle(Tid, I, I, Data, Data).
+
+ets_shuffle(Tid, 0, N, _, Data) ->
+ ets_shuffle(Tid, N, N, Data, Data);
+ets_shuffle(Tid, I, N, Data, Data0) ->
+ receive
+ done -> ok
+ after 0 ->
+ Key = rand:uniform(1000),
+ Data1 = [I|Data],
+ ets:insert(Tid, {Key, Data1}),
+ ets_shuffle(Tid, I - 1, N, Data1, Data0)
+ end.
+
+
+
+
+memory_load() ->
+ Me = self(),
+ Pids0 = [spawn_link(fun() -> memory_loop(Me, 20, <<42>>) end) || _ <- lists:seq(1,30)],
+ timer:sleep(50),
+ Pids1 = [spawn_link(fun() -> memory_loop(Me, 20, <<42>>) end) || _ <- lists:seq(1,30)],
+ [receive {Pid, done} -> ok end || Pid <- Pids0 ++ Pids1],
+ timer:sleep(500),
+ ok.
+
+memory_loop(Parent, N, Bin) ->
+ memory_loop(Parent, N, Bin, []).
+
+memory_loop(Parent, 0, _Bin, _) ->
+ Parent ! {self(), done};
+memory_loop(Parent, N, Bin0, Ls) ->
+ Bin = binary:copy(<<Bin0/binary, Bin0/binary>>),
+ memory_loop(Parent, N - 1, Bin, [a,b,c|Ls]).
+
+tcp_server(Pid, Type) ->
+ {ok, LSock} = gen_tcp:listen(5679, [binary,
+ {reuseaddr, true},
+ {active, false}]),
+ Pid ! {self(), accept},
+ {ok, Sock} = gen_tcp:accept(LSock),
+ case Type of
+ passive_no_read ->
+ receive die -> ok end;
+ active ->
+ inet:setopts(Sock, [{active, once}, {packet,2}]),
+ receive Msg1 -> io:format("msg1: ~p~n", [Msg1]) end,
+ inet:setopts(Sock, [{active, once}, {packet,2}]),
+ receive Msg2 -> io:format("msg2: ~p~n", [Msg2]) end,
+ ok = gen_tcp:close(Sock);
+ timeout ->
+ Res = gen_tcp:recv(Sock, 2000, 1000),
+ io:format("res ~p~n", [Res])
+ end,
+ Pid ! {self(), done},
+ ok.
+
+txt() ->
+ <<"%% tracepoints\n"
+ "%%\n"
+ "%% com_ericsson_otp:carrier_pool_get\n"
+ "%% com_ericsson_otp:carrier_pool_put\n"
+ "%% com_ericsson_otp:carrier_destroy\n"
+ "%% com_ericsson_otp:carrier_create\n"
+ "%% com_ericsson_otp:aio_pool_add\n"
+ "%% com_ericsson_otp:aio_pool_get\n"
+ "%% com_ericsson_otp:driver_control\n"
+ "%% com_ericsson_otp:driver_call\n"
+ "%% com_ericsson_otp:driver_finish\n"
+ "%% com_ericsson_otp:driver_ready_async\n"
+ "%% com_ericsson_otp:driver_process_exit\n"
+ "%% com_ericsson_otp:driver_stop\n"
+ "%% com_ericsson_otp:driver_flush\n"
+ "%% com_ericsson_otp:driver_stop_select\n"
+ "%% com_ericsson_otp:driver_timeout\n"
+ "%% com_ericsson_otp:driver_event\n"
+ "%% com_ericsson_otp:driver_ready_output\n"
+ "%% com_ericsson_otp:driver_ready_input\n"
+ "%% com_ericsson_otp:driver_output\n"
+ "%% com_ericsson_otp:driver_outputv\n"
+ "%% com_ericsson_otp:driver_init\n"
+ "%% com_ericsson_otp:driver_start\n"
+ "%% com_ericsson_otp:scheduler_poll">>.
+
+load_driver(Dir, Driver) ->
+ case erl_ddll:load_driver(Dir, Driver) of
+ ok -> ok;
+ {error, Error} = Res ->
+ io:format("~s\n", [erl_ddll:format_error(Error)]),
+ Res
+ end.
+
+%% check
+
+have_carriers() ->
+ Cap = element(3,erlang:system_info(allocator)),
+ case Cap -- [sys_alloc,sys_aligned_alloc] of
+ [] -> false;
+ _ -> true
+ end.
+
+have_async_threads() ->
+ Tps = erlang:system_info(thread_pool_size),
+ if Tps =:= 0 -> false;
+ true -> true
+ end.
+
+%% lttng
+lttng_stop_and_view(Config) ->
+ Path = proplists:get_value(priv_dir, Config),
+ Name = proplists:get_value(session, Config),
+ {ok,_} = cmd("lttng stop " ++ Name),
+ {ok,Res} = cmd("lttng view " ++ Name ++ " --trace-path=" ++ Path),
+ Res.
+
+check_tracepoint(TP, Data) ->
+ case re:run(Data, TP, [global]) of
+ {match, _} -> ok;
+ _ -> notfound
+ end.
+
+lttng_start_event(Event, Config) ->
+ Name = proplists:get_value(session, Config),
+ {ok, _} = cmd("lttng enable-event -u " ++ Event ++ " --session=" ++ Name),
+ {ok, _} = cmd("lttng start " ++ Name),
+ ok.
+
+ensure_lttng_started(Name, Config) ->
+ Out = case proplists:get_value(priv_dir, Config) of
+ undefined -> [];
+ Path -> "--output="++Path++" "
+ end,
+ {ok,_} = cmd("lttng create " ++ Out ++ Name),
+ ok.
+
+ensure_lttng_stopped(Name) ->
+ {ok,_} = cmd("lttng stop"),
+ {ok,_} = cmd("lttng destroy " ++ Name),
+ ok.
+
+cmd(Cmd) ->
+ io:format("<< ~ts~n", [Cmd]),
+ Res = os:cmd(Cmd),
+ io:format(">> ~ts~n", [Res]),
+ {ok,Res}.
diff --git a/erts/emulator/test/lttng_SUITE_data/Makefile.src b/erts/emulator/test/lttng_SUITE_data/Makefile.src
new file mode 100644
index 0000000000..fe7a1b6ef3
--- /dev/null
+++ b/erts/emulator/test/lttng_SUITE_data/Makefile.src
@@ -0,0 +1,7 @@
+
+MISC_DRVS = caller_drv@dll@
+
+
+all: $(MISC_DRVS)
+
+@SHLIB_RULES@
diff --git a/erts/emulator/test/lttng_SUITE_data/caller_drv.c b/erts/emulator/test/lttng_SUITE_data/caller_drv.c
new file mode 100644
index 0000000000..86fd0a2995
--- /dev/null
+++ b/erts/emulator/test/lttng_SUITE_data/caller_drv.c
@@ -0,0 +1,159 @@
+/* ``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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+ * Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+ * AB. All Rights Reserved.''
+ *
+ * $Id$
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "erl_driver.h"
+
+static int init();
+static void stop(ErlDrvData drv_data);
+static void finish();
+static void flush(ErlDrvData drv_data);
+static ErlDrvData start(ErlDrvPort port, char *command);
+static void output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len);
+static void outputv(ErlDrvData drv_data, ErlIOVec *ev);
+static ErlDrvSSizeT control(ErlDrvData drv_data,
+ unsigned int command, char *buf,
+ ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen);
+static ErlDrvSSizeT call(ErlDrvData drv_data,
+ unsigned int command,
+ char *buf, ErlDrvSizeT len,
+ char **rbuf, ErlDrvSizeT rlen,
+ unsigned int *flags);
+
+static ErlDrvEntry caller_drv_entry = {
+ init,
+ start,
+ stop,
+ output,
+ NULL /* ready_input */,
+ NULL /* ready_output */,
+ "caller_drv",
+ finish,
+ NULL /* handle */,
+ control,
+ NULL /* timeout */,
+ outputv,
+ NULL /* ready_async */,
+ flush,
+ call,
+ NULL /* event */,
+ ERL_DRV_EXTENDED_MARKER,
+ ERL_DRV_EXTENDED_MAJOR_VERSION,
+ ERL_DRV_EXTENDED_MINOR_VERSION,
+ ERL_DRV_FLAG_USE_PORT_LOCKING,
+ NULL /* handle2 */,
+ NULL /* handle_monitor */
+};
+
+DRIVER_INIT(caller_drv)
+{
+ char buf[10];
+ size_t bufsz = sizeof(buf);
+ char *use_outputv;
+ use_outputv = (erl_drv_getenv("CALLER_DRV_USE_OUTPUTV", buf, &bufsz) == 0
+ ? buf
+ : "false");
+ if (strcmp(use_outputv, "true") != 0)
+ caller_drv_entry.outputv = NULL;
+ return &caller_drv_entry;
+}
+
+void
+send_caller(ErlDrvData drv_data, char *func)
+{
+ int res;
+ ErlDrvPort port = (ErlDrvPort) drv_data;
+ ErlDrvTermData msg[] = {
+ ERL_DRV_ATOM, driver_mk_atom("caller"),
+ ERL_DRV_PORT, driver_mk_port(port),
+ ERL_DRV_ATOM, driver_mk_atom(func),
+ ERL_DRV_PID, driver_caller(port),
+ ERL_DRV_TUPLE, (ErlDrvTermData) 4
+ };
+ res = erl_drv_output_term(driver_mk_port(port), msg, sizeof(msg)/sizeof(ErlDrvTermData));
+ if (res <= 0)
+ driver_failure_atom(port, "erl_drv_output_term failed");
+}
+
+static int
+init() {
+ return 0;
+}
+
+static void
+stop(ErlDrvData drv_data)
+{
+
+}
+
+static void
+flush(ErlDrvData drv_data)
+{
+
+}
+
+static void
+finish()
+{
+
+}
+
+static ErlDrvData
+start(ErlDrvPort port, char *command)
+{
+ send_caller((ErlDrvData) port, "start");
+ return (ErlDrvData) port;
+}
+
+static void
+output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len)
+{
+ send_caller(drv_data, "output");
+}
+
+static void
+outputv(ErlDrvData drv_data, ErlIOVec *ev)
+{
+ send_caller(drv_data, "outputv");
+}
+
+static ErlDrvSSizeT
+control(ErlDrvData drv_data,
+ unsigned int command, char *buf,
+ ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen)
+{
+ send_caller(drv_data, "control");
+ return 0;
+}
+
+static ErlDrvSSizeT
+call(ErlDrvData drv_data,
+ unsigned int command,
+ char *buf, ErlDrvSizeT len,
+ char **rbuf, ErlDrvSizeT rlen,
+ unsigned int *flags)
+{
+ /* echo call */
+ if (len > rlen)
+ *rbuf = driver_alloc(len);
+ memcpy((void *) *rbuf, (void *) buf, len);
+ send_caller(drv_data, "call");
+ return len;
+}