Ensure executables called in Go Process get killed when Process is killed

Question

I have some code that in Go (golang), has a few different threads running a separate executable. I want to ensure that if a user kills my process in Go, that I have a way of

Answer 1

I would suggest you to use unix.Prctl.

flag := unix.SIGHUP
if err := unix.Prctl(unix.PR_SET_PDEATHSIG, uintptr(flag), 0, 0, 0); err != nil {
    return
}

A detailed example is below, new.go for child process and main.go as parent process.

//new.go
package main

func main() {
    flag := unix.SIGHUP

    if err := unix.Prctl(unix.PR_SET_PDEATHSIG, uintptr(flag), 0, 0, 0); err != nil {
    return
    }

    f, _ := os.Create("./dat2")
    defer f.Close()
    i := 0
    for {
        n3, _ := f.WriteString("writes " + string(i) + "\n")
        fmt.Printf("wrote %d bytes\n", n3)
        f.Sync()
        i += 2
        time.Sleep(2 * time.Second)
    }

    for {
        n3, _ := f.WriteString("newwrites\n")
        fmt.Printf("wrote %d bytes\n", n3)
        f.Sync()
        time.Sleep(2 * time.Second)
    }
}


//main.go
package main

import "os/exec"

func main() {
    commandA := exec.Command("./new")
    commandA.Start()
    commandB := exec.Command("./new")
    commandB.Start()
    for {
    }
}