aboutsummaryrefslogtreecommitdiffstats
path: root/lib/kernel/src/standard_error.erl
diff options
context:
space:
mode:
Diffstat (limited to 'lib/kernel/src/standard_error.erl')
-rw-r--r--lib/kernel/src/standard_error.erl253
1 files changed, 253 insertions, 0 deletions
diff --git a/lib/kernel/src/standard_error.erl b/lib/kernel/src/standard_error.erl
new file mode 100644
index 0000000000..73901d9896
--- /dev/null
+++ b/lib/kernel/src/standard_error.erl
@@ -0,0 +1,253 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2009. 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(standard_error).
+-behaviour(supervisor_bridge).
+
+%% Basic standard i/o server for user interface port.
+-export([start_link/0, init/1, terminate/2]).
+
+-define(NAME, standard_error).
+-define(PROCNAME_SUP, standard_error_sup).
+%% Internal exports
+-export([server/1, server/2]).
+
+%% Defines for control ops
+-define(CTRL_OP_GET_WINSIZE,100).
+
+%%
+%% The basic server and start-up.
+%%
+start_link() ->
+ supervisor_bridge:start_link({local, ?PROCNAME_SUP}, ?MODULE, []).
+
+terminate(_Reason,Pid) ->
+ (catch exit(Pid,kill)),
+ ok.
+
+init([]) ->
+ case (catch start_port([out,binary])) of
+ Pid when is_pid(Pid) ->
+ {ok,Pid,Pid};
+ _ ->
+ {error,no_stderror}
+ end.
+
+
+start_port(PortSettings) ->
+ Id = spawn(?MODULE,server,[{fd,2,2},PortSettings]),
+ register(?NAME,Id),
+ Id.
+
+
+server(Pid) when is_pid(Pid) ->
+ process_flag(trap_exit, true),
+ link(Pid),
+ run(Pid).
+
+server(PortName,PortSettings) ->
+ process_flag(trap_exit, true),
+ Port = open_port(PortName,PortSettings),
+ run(Port).
+
+run(P) ->
+ put(unicode,false),
+ server_loop(P).
+
+server_loop(Port) ->
+ receive
+ {io_request,From,ReplyAs,Request} when is_pid(From) ->
+ do_io_request(Request, From, ReplyAs, Port),
+ server_loop(Port);
+ {'EXIT',Port,badsig} -> % Ignore badsig errors
+ server_loop(Port);
+ {'EXIT',Port,What} -> % Port has exited
+ exit(What);
+ _Other -> % Ignore other messages
+ server_loop(Port)
+ end.
+
+
+get_fd_geometry(Port) ->
+ case (catch port_control(Port,?CTRL_OP_GET_WINSIZE,[])) of
+ List when is_list(List), length(List) =:= 8 ->
+ <<W:32/native,H:32/native>> = list_to_binary(List),
+ {W,H};
+ _ ->
+ error
+ end.
+
+
+%% NewSaveBuffer = io_request(Request, FromPid, ReplyAs, Port, SaveBuffer)
+
+do_io_request(Req, From, ReplyAs, Port) ->
+ {_Status,Reply} = io_request(Req, Port),
+ io_reply(From, ReplyAs, Reply).
+
+%% New in R13B
+% Wide characters (Unicode)
+io_request({put_chars,Encoding,Chars}, Port) -> % Binary new in R9C
+ put_chars(wrap_characters_to_binary(Chars,Encoding,
+ case get(unicode) of
+ true -> unicode;
+ _ -> latin1
+ end), Port);
+io_request({put_chars,Encoding,Mod,Func,Args}, Port) ->
+ Result = case catch apply(Mod,Func,Args) of
+ Data when is_list(Data); is_binary(Data) ->
+ wrap_characters_to_binary(Data,Encoding,
+ case get(unicode) of
+ true -> unicode;
+ _ -> latin1
+ end);
+ Undef ->
+ Undef
+ end,
+ put_chars(Result, Port);
+%% BC if called from pre-R13 node
+io_request({put_chars,Chars}, Port) ->
+ io_request({put_chars,latin1,Chars}, Port);
+io_request({put_chars,Mod,Func,Args}, Port) ->
+ io_request({put_chars,latin1,Mod,Func,Args}, Port);
+%% New in R12
+io_request({get_geometry,columns},Port) ->
+ case get_fd_geometry(Port) of
+ {W,_H} ->
+ {ok,W};
+ _ ->
+ {error,{error,enotsup}}
+ end;
+io_request({get_geometry,rows},Port) ->
+ case get_fd_geometry(Port) of
+ {_W,H} ->
+ {ok,H};
+ _ ->
+ {error,{error,enotsup}}
+ end;
+io_request({getopts,[]}, Port) ->
+ getopts(Port);
+io_request({setopts,Opts}, Port) when is_list(Opts) ->
+ setopts(Opts, Port);
+io_request({requests,Reqs}, Port) ->
+ io_requests(Reqs, {ok,ok}, Port);
+io_request(R, _Port) -> %Unknown request
+ {error,{error,{request,R}}}. %Ignore but give error (?)
+
+%% Status = io_requests(RequestList, PrevStat, Port)
+%% Process a list of output requests as long as the previous status is 'ok'.
+
+io_requests([R|Rs], {ok,_Res}, Port) ->
+ io_requests(Rs, io_request(R, Port), Port);
+io_requests([_|_], Error, _) ->
+ Error;
+io_requests([], Stat, _) ->
+ Stat.
+
+%% put_port(DeepList, Port)
+%% Take a deep list of characters, flatten and output them to the
+%% port.
+
+put_port(List, Port) ->
+ send_port(Port, {command, List}).
+
+%% send_port(Port, Command)
+
+send_port(Port, Command) ->
+ Port ! {self(),Command}.
+
+
+%% io_reply(From, ReplyAs, Reply)
+%% The function for sending i/o command acknowledgement.
+%% The ACK contains the return value.
+
+io_reply(From, ReplyAs, Reply) ->
+ From ! {io_reply,ReplyAs,Reply}.
+
+%% put_chars
+put_chars(Chars, Port) when is_binary(Chars) ->
+ put_port(Chars, Port),
+ {ok,ok};
+put_chars(Chars, Port) ->
+ case catch list_to_binary(Chars) of
+ Binary when is_binary(Binary) ->
+ put_chars(Binary, Port);
+ _ ->
+ {error,{error,put_chars}}
+ end.
+
+%% setopts
+setopts(Opts0,Port) ->
+ Opts = proplists:unfold(
+ proplists:substitute_negations(
+ [{latin1,unicode}],
+ Opts0)),
+ case check_valid_opts(Opts) of
+ true ->
+ do_setopts(Opts,Port);
+ false ->
+ {error,{error,enotsup}}
+ end.
+check_valid_opts([]) ->
+ true;
+check_valid_opts([{unicode,Valid}|T]) when Valid =:= true; Valid =:= utf8; Valid =:= false ->
+ check_valid_opts(T);
+check_valid_opts(_) ->
+ false.
+
+do_setopts(Opts, _Port) ->
+ case proplists:get_value(unicode,Opts) of
+ Valid when Valid =:= true; Valid =:= utf8 ->
+ put(unicode,true);
+ false ->
+ put(unicode,false);
+ undefined ->
+ ok
+ end,
+ {ok,ok}.
+
+getopts(_Port) ->
+ Uni = {unicode, case get(unicode) of
+ true ->
+ true;
+ _ ->
+ false
+ end},
+ {ok,[Uni]}.
+
+wrap_characters_to_binary(Chars,From,To) ->
+ TrNl = (whereis(user_drv) =/= undefined),
+ Limit = case To of
+ latin1 ->
+ 255;
+ _Else ->
+ 16#10ffff
+ end,
+ unicode:characters_to_binary(
+ [ case X of
+ $\n ->
+ if
+ TrNl ->
+ "\r\n";
+ true ->
+ $\n
+ end;
+ High when High > Limit ->
+ ["\\x{",erlang:integer_to_list(X, 16),$}];
+ Ordinary ->
+ Ordinary
+ end || X <- unicode:characters_to_list(Chars,From) ],unicode,To).
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 01:54:32 +0000