help() function won't work

[Infixz]

Prerequisites

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Questions should be posted to the users mailing list which can be accessed at
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• Are you running the latest version? yes, it's .net core 3.1 runing netcoreapp3.1_ipy
• Are you reporting to the correct repository? yes
• Did you perform a cursory search? yes

Description

[Description of the bug or feature]
help(built-in type) and it raised an exception ( IOError)

Steps to Reproduce

System.Collections.ArrayList
<type 'ArrayList'>
help(System.Collections.ArrayList)
Traceback (most recent call last):
File "", line 1, in
File "/home/chengs/IronPython.2.7.10/Lib/site.py", line 450, in call
File "/home/chengs/IronPython.2.7.10/Lib/pydoc.py", line 1796, in call
File "/home/chengs/IronPython.2.7.10/Lib/pydoc.py", line 1834, in help
File "/home/chengs/IronPython.2.7.10/Lib/pydoc.py", line 1579, in doc
File "/home/chengs/IronPython.2.7.10/Lib/pydoc.py", line 1375, in pager
File "/home/chengs/IronPython.2.7.10/Lib/pydoc.py", line 1384, in getpager
IOError: [Errno 2] Could not load file or assembly 'Mono.Posix.NETStandard, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

System.Collections.ArrayList.doc
'ArrayList()\nArrayList(capacity: int)\nArrayList(c: ICollection)\n'

Expected behavior: [What you expected to happen]

Actual behavior: [What actually happened]

Versions

You can get this information from executing ipy -V.
IronPython 2.7.10 (2.7.10.1000)
[.NETCoreApp,Version=v3.1 on .NET Core 3.1.3 (64-bit)]

[slozier]

It looks like the Mono.Posix.NETStandard DLLs are not included in the zip file. Related to #465

As a workaround you can download the nuget package linked above, unzip and place the Mono.Posix.NETStandard.dll for your runtime in the ipy folder.

[Infixz]

it worked after i place a .netstandard 2.0 version of this dll, but it idle a lot when use q to quit help() description doc.

[Infixz]

exception. System.PlatformNotSupportedException: Thread abort is not supported on this platform.
at System.Threading.Thread.Abort(Object stateInfo)
at Microsoft.Scripting.Hosting.Shell.BasicConsole.<.ctor>b__24_0(Object sender, ConsoleCancelEventArgs e)
at Microsoft.Scripting.Hosting.Shell.BasicConsole.<.ctor>b__24_1(Object sender, ConsoleCancelEventArgs e)
at System.Console.HandleBreakEvent(ConsoleSpecialKey controlKey)
at System.ConsolePal.ControlCHandlerRegistrar.HandleBreakEvent(Object state)
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart(Object obj)
^C^CAborted (core dumped)

[slozier]

Seems to be some sort of deadlock when calling Console.CursorTop. Might be the same issue described in dotnet/runtime#34239