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-rw-r--r--lib/kernel/src/os.erl191
-rw-r--r--lib/kernel/test/os_SUITE.erl58
2 files changed, 37 insertions, 212 deletions
diff --git a/lib/kernel/src/os.erl b/lib/kernel/src/os.erl
index ffb899e5ca..0022959c11 100644
--- a/lib/kernel/src/os.erl
+++ b/lib/kernel/src/os.erl
@@ -212,174 +212,33 @@ extensions() ->
Command :: atom() | io_lib:chars().
cmd(Cmd) ->
validate(Cmd),
- Bytes = case type() of
- {unix, _} ->
- unix_cmd(Cmd);
- {win32, Wtype} ->
- Command0 = case {os:getenv("COMSPEC"),Wtype} of
- {false,windows} -> lists:concat(["command.com /c", Cmd]);
- {false,_} -> lists:concat(["cmd /c", Cmd]);
- {Cspec,_} -> lists:concat([Cspec," /c",Cmd])
- end,
- %% open_port/2 awaits string() in Command, but io_lib:chars() can be
- %% deep lists according to io_lib module description.
- Command = lists:flatten(Command0),
- Port = open_port({spawn, Command}, [stream, in, eof, hide]),
- get_data(Port, [])
- end,
- String = unicode:characters_to_list(list_to_binary(Bytes)),
+ {SpawnCmd, SpawnOpts, SpawnInput} = mk_cmd(os:type(), Cmd),
+ Port = open_port({spawn, SpawnCmd}, [binary, stderr_to_stdout,
+ stream, in, eof, hide | SpawnOpts]),
+ true = port_command(Port, SpawnInput),
+ Bytes = get_data(Port, []),
+ String = unicode:characters_to_list(Bytes),
if %% Convert to unicode list if possible otherwise return bytes
is_list(String) -> String;
- true -> Bytes
+ true -> binary_to_list(Bytes)
end.
-unix_cmd(Cmd) ->
- Tag = make_ref(),
- {Pid,Mref} = erlang:spawn_monitor(
- fun() ->
- process_flag(trap_exit, true),
- Port = start_port(),
- erlang:port_command(Port, mk_cmd(Cmd)),
- exit({Tag,unix_get_data(Port)})
- end),
- receive
- {'DOWN',Mref,_,Pid,{Tag,Result}} ->
- Result;
- {'DOWN',Mref,_,Pid,Reason} ->
- exit(Reason)
- end.
-
-%% The -s flag implies that only the positional parameters are set,
-%% and the commands are read from standard input. We set the
-%% $1 parameter for easy identification of the resident shell.
-%%
--define(ROOT, "/").
--define(ROOT_ANDROID, "/system").
--define(SHELL, "bin/sh -s unix:cmd 2>&1").
--define(PORT_CREATOR_NAME, os_cmd_port_creator).
-
-%%
-%% Serializing open_port through a process to avoid smp lock contention
-%% when many concurrent os:cmd() want to do vfork (OTP-7890).
-%%
--spec start_port() -> port().
-start_port() ->
- Ref = make_ref(),
- Request = {Ref,self()},
- {Pid, Mon} = case whereis(?PORT_CREATOR_NAME) of
- undefined ->
- spawn_monitor(fun() ->
- start_port_srv(Request)
- end);
- P ->
- P ! Request,
- M = erlang:monitor(process, P),
- {P, M}
- end,
- receive
- {Ref, Port} when is_port(Port) ->
- erlang:demonitor(Mon, [flush]),
- Port;
- {Ref, Error} ->
- erlang:demonitor(Mon, [flush]),
- exit(Error);
- {'DOWN', Mon, process, Pid, _Reason} ->
- start_port()
- end.
-
-start_port_srv(Request) ->
- %% We don't want a group leader of some random application. Use
- %% kernel_sup's group leader.
- {group_leader, GL} = process_info(whereis(kernel_sup),
- group_leader),
- true = group_leader(GL, self()),
- process_flag(trap_exit, true),
- StayAlive = try register(?PORT_CREATOR_NAME, self())
- catch
- error:_ -> false
- end,
- start_port_srv_handle(Request),
- case StayAlive of
- true -> start_port_srv_loop();
- false -> exiting
- end.
-
-start_port_srv_handle({Ref,Client}) ->
- Path = case lists:reverse(erlang:system_info(system_architecture)) of
- % androideabi
- "ibaediordna" ++ _ -> filename:join([?ROOT_ANDROID, ?SHELL]);
- _ -> filename:join([?ROOT, ?SHELL])
- end,
- Reply = try open_port({spawn, Path},[stream]) of
- Port when is_port(Port) ->
- (catch port_connect(Port, Client)),
- unlink(Port),
- Port
- catch
- error:Reason ->
- {Reason,erlang:get_stacktrace()}
- end,
- Client ! {Ref,Reply},
- ok.
-
-start_port_srv_loop() ->
- receive
- {Ref, Client} = Request when is_reference(Ref),
- is_pid(Client) ->
- start_port_srv_handle(Request);
- _Junk ->
- ok
- end,
- start_port_srv_loop().
-
-%%
-%% unix_get_data(Port) -> Result
-%%
-unix_get_data(Port) ->
- unix_get_data(Port, []).
-
-unix_get_data(Port, Sofar) ->
- receive
- {Port,{data, Bytes}} ->
- case eot(Bytes) of
- {done, Last} ->
- lists:flatten([Sofar|Last]);
- more ->
- unix_get_data(Port, [Sofar|Bytes])
- end;
- {'EXIT', Port, _} ->
- lists:flatten(Sofar)
- end.
-
-%%
-%% eot(String) -> more | {done, Result}
-%%
-eot(Bs) ->
- eot(Bs, []).
-
-eot([4| _Bs], As) ->
- {done, lists:reverse(As)};
-eot([B| Bs], As) ->
- eot(Bs, [B| As]);
-eot([], _As) ->
- more.
-
-%%
-%% mk_cmd(Cmd) -> {ok, ShellCommandString} | {error, ErrorString}
-%%
-%% We do not allow any input to Cmd (hence commands that want
-%% to read from standard input will return immediately).
-%% Standard error is redirected to standard output.
-%%
-%% We use ^D (= EOT = 4) to mark the end of the stream.
-%%
-mk_cmd(Cmd) when is_atom(Cmd) -> % backward comp.
- mk_cmd(atom_to_list(Cmd));
-mk_cmd(Cmd) ->
- %% We insert a new line after the command, in case the command
- %% contains a comment character.
- [$(, unicode:characters_to_binary(Cmd), "\n) </dev/null; echo \"\^D\"\n"].
-
+mk_cmd({win32,Wtype}, Cmd) ->
+ Command = case {os:getenv("COMSPEC"),Wtype} of
+ {false,windows} -> lists:concat(["command.com /c", Cmd]);
+ {false,_} -> lists:concat(["cmd /c", Cmd]);
+ {Cspec,_} -> lists:concat([Cspec," /c",Cmd])
+ end,
+ {Command, [], []};
+mk_cmd(OsType,Cmd) when is_atom(Cmd) ->
+ mk_cmd(OsType, atom_to_list(Cmd));
+mk_cmd(_,Cmd) ->
+ %% Have to send command in like this in order to make sh commands like
+ %% cd and ulimit available
+ {"/bin/sh -s unix:cmd", [out],
+ %% We insert a new line after the command, in case the command
+ %% contains a comment character.
+ ["(", unicode:characters_to_binary(Cmd), "\n); exit\n"]}.
validate(Atom) when is_atom(Atom) ->
ok;
@@ -397,7 +256,7 @@ validate1([]) ->
get_data(Port, Sofar) ->
receive
{Port, {data, Bytes}} ->
- get_data(Port, [Sofar|Bytes]);
+ get_data(Port, [Sofar,Bytes]);
{Port, eof} ->
Port ! {self(), close},
receive
@@ -410,5 +269,5 @@ get_data(Port, Sofar) ->
after 1 -> % force context switch
ok
end,
- lists:flatten(Sofar)
+ iolist_to_binary(Sofar)
end.
diff --git a/lib/kernel/test/os_SUITE.erl b/lib/kernel/test/os_SUITE.erl
index 29d8d10262..83a95019e7 100644
--- a/lib/kernel/test/os_SUITE.erl
+++ b/lib/kernel/test/os_SUITE.erl
@@ -22,7 +22,8 @@
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2]).
-export([space_in_cwd/1, quoting/1, cmd_unicode/1, space_in_name/1, bad_command/1,
- find_executable/1, unix_comment_in_command/1, deep_list_command/1, evil/1]).
+ find_executable/1, unix_comment_in_command/1, deep_list_command/1,
+ large_output_command/1]).
-include_lib("test_server/include/test_server.hrl").
@@ -30,7 +31,8 @@ suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[space_in_cwd, quoting, cmd_unicode, space_in_name, bad_command,
- find_executable, unix_comment_in_command, deep_list_command, evil].
+ find_executable, unix_comment_in_command, deep_list_command,
+ large_output_command].
groups() ->
[].
@@ -267,50 +269,14 @@ deep_list_command(Config) when is_list(Config) ->
%% FYI: [$e, $c, "ho"] =:= io_lib:format("ec~s", ["ho"])
ok.
-
--define(EVIL_PROCS, 100).
--define(EVIL_LOOPS, 100).
--define(PORT_CREATOR, os_cmd_port_creator).
-evil(Config) when is_list(Config) ->
- Dog = test_server:timetrap(test_server:minutes(5)),
- Parent = self(),
- Ps = lists:map(fun (N) ->
- spawn_link(fun () ->
- evil_loop(Parent, ?EVIL_LOOPS,N)
- end)
- end, lists:seq(1, ?EVIL_PROCS)),
- Devil = spawn_link(fun () -> devil(hd(Ps), hd(lists:reverse(Ps))) end),
- lists:foreach(fun (P) -> receive {P, done} -> ok end end, Ps),
- unlink(Devil),
- exit(Devil, kill),
- test_server:timetrap_cancel(Dog),
- ok.
-
-devil(P1, P2) ->
- erlang:display({?PORT_CREATOR, whereis(?PORT_CREATOR)}),
- (catch ?PORT_CREATOR ! lists:seq(1,1000000)),
- (catch ?PORT_CREATOR ! lists:seq(1,666)),
- (catch ?PORT_CREATOR ! grrrrrrrrrrrrrrrr),
- (catch ?PORT_CREATOR ! {'EXIT', P1, buhuuu}),
- (catch ?PORT_CREATOR ! {'EXIT', hd(erlang:ports()), buhuuu}),
- (catch ?PORT_CREATOR ! {'EXIT', P2, arggggggg}),
- receive after 500 -> ok end,
- (catch exit(whereis(?PORT_CREATOR), kill)),
- (catch ?PORT_CREATOR ! ">8|"),
- receive after 500 -> ok end,
- (catch exit(whereis(?PORT_CREATOR), diiiiiiiiiiiiiiiiiiiie)),
- receive after 100 -> ok end,
- devil(P1, P2).
-
-evil_loop(Parent, Loops, N) ->
- Res = integer_to_list(N),
- evil_loop(Parent, Loops, Res, "echo " ++ Res).
-
-evil_loop(Parent, 0, _Res, _Cmd) ->
- Parent ! {self(), done};
-evil_loop(Parent, Loops, Res, Cmd) ->
- comp(Res, os:cmd(Cmd)),
- evil_loop(Parent, Loops-1, Res, Cmd).
+large_output_command(doc) ->
+ "Test to take sure that the correct data is"
+ "received when doing large commands";
+large_output_command(suite) -> [];
+large_output_command(Config) when is_list(Config) ->
+ %% Maximum allowed on windows is 8192, so we test well below that
+ AAA = lists:duplicate(7000, $a),
+ comp(AAA,os:cmd("echo " ++ AAA)).
comp(Expected, Got) ->
case strip_nl(Got) of
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-03 15:31:53 +0000