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

• 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

The code below fails with cat: /dev/stdin: No such device or address.

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:

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()
}

从 Node.js 的 child_process 子系统入手，在 Linux 上重现所提供的 spawn('cat', ['/dev/stdin'], ...) 示例，并将其与 Go 示例进行比较。当预期的 Unix stdin 行为得到确立，且报告的失败已由回归测试覆盖时，即视为完成。