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()
}

Commencez dans le sous-système child_process de Node.js et reproduisez l’exemple fourni spawn('cat', ['/dev/stdin'], ...) sous Linux, en le comparant avec l’exemple en Go. La tâche est terminée lorsque le comportement attendu de stdin sous Unix est établi et que l’échec signalé est couvert par un test de régression.