Processes created using spawn with a pipe have no /dev/stdin

<!-- Thank you for reporting an issue. This issue tracker is for bugs and issues found within Node.js core. If you require more general support please file an issue on our help repo. https://github.com/nodejs/help Please fill in as much of the template below as you're able. Version: output of `node -v` Platform: output of `uname -a` (UNIX), or version and 32 or 64-bit (Windows) Subsystem: if known, please specify affected core module name If possible, please provide code that demonstrates the problem, keeping it as simple and free of external dependencies as you are able. --> * **Version**: v8.9.4 * **Platform**: Linux 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02) x86_64 GNU/Linux * **Subsystem**: child_process <!-- Enter your issue details below this comment. --> The code below fails with `cat: /dev/stdin: No such device or address`. ```js const {spawn} = require('child_process'); const proc = spawn('cat', ['/dev/stdin'], {stdio: ['pipe', process.stdout, process.stderr]}); ``` Apparently Node spawns sub processes in a way that there is no `/dev/stdin` allocated. I think this is a NodeJS bug - on UNIX, a sub process should be able to open `/dev/stdin` if there is a stdin for it. The following Go program for example works perfectly fine: ```go func main() { cmd := exec.Command("cat", "/dev/stdin") cmd.Stderr = os.Stderr cmd.Stdout = os.Stdout stdin, _ := cmd.StdinPipe() go func() { stdin.Write([]byte("hello cat!\n")) stdin.Close() }() cmd.Run() } ```