What version of Go are you using (go version)?

1.18.2

Does this issue reproduce with the latest release?

package main

import (
	"fmt"
	"io"
	"log"
	"os/exec"
	"os"
)

func main() {
	command :="openconnect"
	param := []string{"https://192.168.0.100:1443","-u","test","--passwd-on-stdin"}
	cmd :=exec.Command(command,param...)
	stdin, err := cmd.StdinPipe()
	if err != nil {
		log.Fatal(err)
	}
	go func() {
		defer stdin.Close()
		io.WriteString(stdin, "123\n")
	}()
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err = cmd.Start(); err != nil { //Use start, not run
		fmt.Println("An error occured: ", err) //replace with logger, or anything you want
	}
	cmd.Wait()

}

• StdinPipe not work

What operating system and processor architecture are you using (go env)?

windows

What did you do?

#19452

I encountered the same problem. My code is basically the same as the author's.

1. For command programs written in golang, stdinpipe can work normally.
2. BeamMP-Server.exe, stdinpipe does not work properly, but if I start it manually, I can enter commands normally.
   https://beammp.com/
   Download server

What did you expect to see?

stdinpipe work normally for BeamMP-Server.exe program.

What did you see instead?

• no error
• command no work
• program stdout didn't print everything