Re: Redirecting stdin/stdout

[书呆彭, Peng Yi <nerditation@...>]

在 2016/3/25 19:26, Dibyendu Majumdar 写道:
> Hi
>
> I am working on implementing a debug adapter for Lua/Ravi for VSCode.
> The way VSCode interacts with the adapter is via stdin/stdout. So I
> have two options for interacting with the Lua VM:
>
> a) VSCode launches the Debug Adapter (as a process) which then
> launches Lua as another separate process and communicates with Lua
> over TCP/IP (similar to MobDebug).
>
> b) VSCode launches the Debug Adapter (as a process) which then runs
> Lua in-process.
>
> I prefer b) for now, eventually I may also look at a). But in order to
> implement b) I need to get Lua to avoid reading/writing from
> stdin/stdout directly. So I am thinking of adding fields in lua_State
> that will hold stdin/stdout file descriptors that Lua should use - so
> that I can set these to alternative file descriptors. I would like to
> redirect Lua's stdout to a file, while the real stdout is taken over
> by the debug adapter. Similarly Lua's stdin will read from a file,
> while the real stdin is read by the debug adapter.
>
> Has anyone done a similar redirection exercise before?
>
> Regards
> Dibyendu
I don't think lua_State is the right place to put that information. the core Lua engine does no IO
at all. the lua_newstate function only takes a allocator. it is the library and the interpreter
program which deal with IO. so IMO you should really change the baselib instead.

I am not aware of the VSCode adapter protocol. does it use native Windows HANDLE or the CRT file descriptor?
you might be interested in these functions: GetStdHandle, SetStdHandle, _get_osfhandle, _open_osfhandle

--
the nerdy Peng / 书呆彭 / Sent from Thunderbird