File 1924-kernel-Remove-shell-whereis_evaluator.patch of Package erlang

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File 1924-kernel-Remove-shell-whereis_evaluator.patch of Package erlang

From d289ca2695069d782b62e8a58a566a8aa3c5c769 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Wed, 11 May 2022 08:04:18 +0200
Subject: [PATCH 04/34] kernel: Remove shell:whereis_evaluator

shell:whereis_evaluator was only used by the pman application
but was not removed when that application was removed.
---
 lib/kernel/src/group.erl    | 47 ++++++++------------------------
 lib/kernel/src/user.erl     | 17 ------------
 lib/kernel/src/user_drv.erl | 25 -----------------
 lib/stdlib/src/shell.erl    | 54 -------------------------------------
 4 files changed, 11 insertions(+), 132 deletions(-)

diff --git a/lib/kernel/src/group.erl b/lib/kernel/src/group.erl
index 8410c1a4b5..f8ce13e947 100644
--- a/lib/kernel/src/group.erl
+++ b/lib/kernel/src/group.erl
@@ -22,7 +22,6 @@
 %% A group leader process for user io.
 
 -export([start/2, start/3, server/3]).
--export([interfaces/1]).
 
 start(Drv, Shell) ->
     start(Drv, Shell, []).
@@ -40,31 +39,8 @@ server(Drv, Shell, Options) ->
 	proplists:get_value(expand_fun, Options,
 			    fun(B) -> edlin_expand:expand(B) end)),
     put(echo, proplists:get_value(echo, Options, true)),
-    
-    start_shell(Shell),
-    server_loop(Drv, get(shell), []).
-
-%% Return the pid of user_drv and the shell process.
-%% Note: We can't ask the group process for this info since it
-%% may be busy waiting for data from the driver.
-interfaces(Group) ->
-    case process_info(Group, dictionary) of
-	{dictionary,Dict} ->
-	    get_pids(Dict, [], false);
-	_ ->
-	    []
-    end.
 
-get_pids([Drv = {user_drv,_} | Rest], Found, _) ->
-    get_pids(Rest, [Drv | Found], true);
-get_pids([Sh = {shell,_} | Rest], Found, Active) ->
-    get_pids(Rest, [Sh | Found], Active);
-get_pids([_ | Rest], Found, Active) ->
-    get_pids(Rest, Found, Active);
-get_pids([], Found, true) ->
-    Found;
-get_pids([], _Found, false) ->
-    [].
+    server_loop(Drv, start_shell(Shell), []).
 
 %% start_shell(Shell)
 %%  Spawn a shell with its group_leader from the beginning set to ourselves.
@@ -81,9 +57,9 @@ start_shell(Shell) when is_function(Shell) ->
 start_shell(Shell) when is_pid(Shell) ->
     group_leader(self(), Shell),		% we are the shells group leader
     link(Shell),				% we're linked to it.
-    put(shell, Shell);
+    Shell;
 start_shell(_Shell) ->
-    ok.
+    undefined.
 
 start_shell1(M, F, Args) ->
     G = group_leader(),
@@ -92,7 +68,7 @@ start_shell1(M, F, Args) ->
 	Shell when is_pid(Shell) ->
 	    group_leader(G, self()),
 	    link(Shell),			% we're linked to it.
-	    put(shell, Shell);
+	    Shell;
 	Error ->				% start failure
 	    exit(Error)				% let the group process crash
     end.
@@ -104,7 +80,7 @@ start_shell1(Fun) ->
 	Shell when is_pid(Shell) ->
 	    group_leader(G, self()),
 	    link(Shell),			% we're linked to it.
-	    put(shell, Shell);
+	    Shell;
 	Error ->				% start failure
 	    exit(Error)				% let the group process crash
     end.
@@ -127,7 +103,7 @@ server_loop(Drv, Shell, Buf0) ->
 	    server_loop(Drv, Shell, Buf0);
 	{'EXIT',Drv,interrupt} ->
 	    %% Send interrupt to the shell.
-	    exit_shell(interrupt),
+	    exit_shell(Shell, interrupt),
 	    server_loop(Drv, Shell, Buf0);
 	{'EXIT',Drv,R} ->
 	    exit(R);
@@ -143,11 +119,10 @@ server_loop(Drv, Shell, Buf0) ->
 	    server_loop(Drv, Shell, Buf0)
     end.
 
-exit_shell(Reason) ->
-    case get(shell) of
-	undefined -> true;
-	Pid -> exit(Pid, Reason)
-    end.
+exit_shell(undefined, _Reason) ->
+    true;
+exit_shell(Pid, Reason) ->
+    exit(Pid, Reason).
 
 get_tty_geometry(Drv) ->
     Drv ! {self(),tty_geometry},
@@ -192,7 +167,7 @@ io_request(Req, From, ReplyAs, Drv, Shell, Buf0) ->
 	    %% 'kill' instead of R, since the shell is not always in
 	    %% a state where it is ready to handle a termination
 	    %% message.
-	    exit_shell(kill),
+	    exit_shell(Shell, kill),
 	    exit(R)
     end.
 
diff --git a/lib/kernel/src/user.erl b/lib/kernel/src/user.erl
index 67c2eafdbe..81048922df 100644
--- a/lib/kernel/src/user.erl
+++ b/lib/kernel/src/user.erl
@@ -23,7 +23,6 @@
 %% Basic standard i/o server for user interface port.
 
 -export([start/0, start/1, start_out/0]).
--export([interfaces/1]).
 
 -define(NAME, user).
 
@@ -55,22 +54,6 @@ start_port(PortSettings) ->
     register(?NAME, Id),
     Id.
 
-%% Return the pid of the shell process.
-%% Note: We can't ask the user process for this info since it
-%% may be busy waiting for data from the port.
-interfaces(User) ->
-    case process_info(User, dictionary) of
-	{dictionary,Dict} ->
-	    case lists:keysearch(shell, 1, Dict) of
-		{value,Sh={shell,Shell}} when is_pid(Shell) ->
-		    [Sh];
-		_ ->
-		    []
-	    end;
-	_ ->
-	    []
-    end.
-
 server(Pid) when is_pid(Pid) ->
     process_flag(trap_exit, true),
     link(Pid),
diff --git a/lib/kernel/src/user_drv.erl b/lib/kernel/src/user_drv.erl
index fa7687bf2a..520dba9419 100644
--- a/lib/kernel/src/user_drv.erl
+++ b/lib/kernel/src/user_drv.erl
@@ -23,8 +23,6 @@
 
 -export([start/0,start/1,start/2,start/3,server/2,server/3]).
 
--export([interfaces/1]).
-
 -include_lib("kernel/include/logger.hrl").
 
 -define(OP_PUTC,0).
@@ -65,26 +63,6 @@ start(Pname, Shell) ->
 start(Iname, Oname, Shell) ->
     spawn(user_drv, server, [Iname,Oname,Shell]).
 
-
-%% Return the pid of the active group process.
-%% Note: We can't ask the user_drv process for this info since it
-%% may be busy waiting for data from the port.
-
--spec interfaces(pid()) -> [{'current_group', pid()}].
-
-interfaces(UserDrv) ->
-    case process_info(UserDrv, dictionary) of
-	{dictionary,Dict} ->
-	    case lists:keysearch(current_group, 1, Dict) of
-		{value,Gr={_,Group}} when is_pid(Group) ->
-		    [Gr];
-		_ ->
-		    []
-	    end;
-	_ ->
-	    []
-    end.
-
 %% server(Pid, Shell)
 %% server(Pname, Shell)
 %% server(Iname, Oname, Shell)
@@ -147,7 +125,6 @@ server1(Iport, Oport, Shell) ->
 		{group:start(self(), Shell),Shell}
 	end,
 
-    put(current_group, Curr),
     Gr = gr_add_cur(Gr1, Curr, Shell1),
     %% Print some information.
     io_request({put_chars, unicode,
@@ -191,7 +168,6 @@ start_user() ->
    
 server_loop(Iport, Oport, User, Gr, IOQueue) ->
     Curr = gr_cur_pid(Gr),
-    put(current_group, Curr),
     server_loop(Iport, Oport, Curr, User, Gr, IOQueue).
 
 server_loop(Iport, Oport, Curr, User, Gr, {Resp, IOQ} = IOQueue) ->
@@ -254,7 +230,6 @@ server_loop(Iport, Oport, Curr, User, Gr, {Resp, IOQ} = IOQueue) ->
 			    Pid1 = group:start(self(), {shell,start,Params}),
 			    {ok,Gr2} = gr_set_cur(gr_set_num(Gr1, Ix, Pid1, 
 							     {shell,start,Params}), Ix),
-			    put(current_group, Pid1),
 			    server_loop(Iport, Oport, Pid1, User, Gr2, IOQueue);
 			_ -> % remote shell
 			    io_requests([{put_chars,unicode,"(^G to start new job) ***\n"}],
diff --git a/lib/stdlib/src/shell.erl b/lib/stdlib/src/shell.erl
index 7de78758b0..c3d9c83a66 100644
--- a/lib/stdlib/src/shell.erl
+++ b/lib/stdlib/src/shell.erl
@@ -20,7 +20,6 @@
 -module(shell).
 
 -export([start/0, start/1, start/2, server/1, server/2, history/1, results/1]).
--export([whereis_evaluator/0, whereis_evaluator/1]).
 -export([start_restricted/1, stop_restricted/0]).
 -export([local_allowed/3, non_local_allowed/3]).
 -export([catch_exception/1, prompt_func/1, strings/1]).
@@ -62,59 +61,6 @@ start(NoCtrlG, StartSync) ->
     _ = code:ensure_loaded(user_default),
     spawn(fun() -> server(NoCtrlG, StartSync) end).
 
-%% Find the pid of the current evaluator process.
--spec whereis_evaluator() -> 'undefined' | pid().
-
-whereis_evaluator() ->
-    %% locate top group leader, always registered as user
-    %% can be implemented by group (normally) or user 
-    %% (if oldshell or noshell)
-    case whereis(user) of
-	undefined ->
-	    undefined;
-	User ->
-	    %% get user_drv pid from group, or shell pid from user
-	    case group:interfaces(User) of
-		[] ->				% old- or noshell
-		    case user:interfaces(User) of
-			[] ->
-			    undefined;
-			[{shell,Shell}] ->
-			    whereis_evaluator(Shell)
-		    end;
-		[{user_drv,UserDrv}] ->
-		    %% get current group pid from user_drv
-		    case user_drv:interfaces(UserDrv) of
-			[] ->
-			    undefined;
-			[{current_group,Group}] ->
-			    %% get shell pid from group
-			    GrIfs = group:interfaces(Group),
-			    case lists:keyfind(shell, 1, GrIfs) of
-				{shell, Shell} ->
-				    whereis_evaluator(Shell);
-				false ->
-				    undefined
-			    end
-		    end
-	    end
-    end.
-
--spec whereis_evaluator(pid()) -> 'undefined' | pid().
-
-whereis_evaluator(Shell) ->
-    case process_info(Shell, dictionary) of
-	{dictionary,Dict} ->
-	    case lists:keyfind(evaluator, 1, Dict) of
-		{_, Eval} when is_pid(Eval) ->
-		    Eval;
-		_ ->
-		    undefined
-	    end;
-	_ ->
-	    undefined
-    end.
-
 %% Call this function to start a user restricted shell 
 %% from a normal shell session.
 -spec start_restricted(Module) -> {'error', Reason} when
-- 
2.35.3

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File 1924-kernel-Remove-shell-whereis_evaluator.patch of Package erlang

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