Linux Subsystem on Windows: EINVAL error when piping into Node in a cmd.exe started from bash

[igabesz]

• Version: v8.9.0 and v8.9.4
• Platform: Windows 10 / Linux Subsystem on Windows
• Subsystem: 1709 16299.125 / Ubuntu 14.04.5 LTS

I have a bash script that runs a cmd that pipes something into the Node.js executable under Windows. Like this:

$ /mnt/c/Windows/System32/cmd.exe /C "echo console.log('hi') | node"

I get the following error:

Error: EINVAL: invalid argument, uv_pipe_open
at new Socket (net.js:200:18)
at createWritableStdioStream (internal/process/stdio.js:164:16)
at process.getStdout [as stdout] (internal/process/stdio.js:14:14)
at console.js:246:38
at NativeModule.compile (bootstrap_node.js:596:7)
at Function.NativeModule.require (bootstrap_node.js:541:18)
at setupGlobalConsole (bootstrap_node.js:310:41)
at startup (bootstrap_node.js:70:7)
at bootstrap_node.js:608:3

This script worked perfectly until the recent major Windows update. And even now both of the following lines are good.

$ /mnt/c/Windows/System32/cmd.exe /C "echo console.log('hi')"
\ cmd /C "echo console.log('hi') | node"

But somehow the cmd.exe piping breaks Node if it is started from Linux. I don't know if this belongs to the Node.js team or the guys at Microsoft broke something. Anyway, looking forward to see some analysis.

PS. My Stack Overflow question is here:
https://stackoverflow.com/questions/48670794/linux-subsystem-on-windows-node-js-einval-error

[igabesz]

Update: this also breaks meaning that it's not about the pipe but rather the startup of Node itself.

/mnt/c/Windows/System32/cmd.exe /C "node"

[mihab]

Yup got the same error with latest LTS of Node, anyone knows of a workaround?

[thasmo]

With node 9.5.0 for me EINVAL errors happen when resizing the terminal window, as described in #9542.

[bzoz]

This is an issue with the WSL, not Node - GetFileType for stdio handles returns FILE_TYPE_PIPE, then when libuv tries to call SetNamedPipeHandleState it fails with ERROR_INVALID_FUNCTION.

Try running Linux version of Node. You can also try redirecting Node output to a real pipe (e.g. by adding | cat) or a file.

[wony-zheng]

when i run libuv in windows:

uv_pipe_t stdin_;
uv_pipe_init(uv_default_loop(), &stdin_, 0);
uv_pipe_open(&stdin_, 0);   // return EINVAL in windows,

after dig into the source , i found the lasterror from SetNamedPipeHandleState() is ERROR_INVALID_FUNCTION. how to fix this error ?