>> So, how can I check the process is actually terminated ?
Hi Michele,
what about using cmd.Wait() to check whether the process exited after you
started a go action? It will return a non-nil in case of error, otherwise
blocks forever waiting the process to finish. Waiting for a reasonable
amount of time to make sure that process doesn't exit and close the /init
call afterwards, would it cover the case you mentioned?
Just to make sure we talk about the same thing:
errorChan := chan string
cmd := exec.Command("userBinary")
cmd.Start()
// wait for failure to happen
go func(){
err := cmd.Wait()
if(err != nil){
errorChan <- "exited with failure"
}
else {
close(errorChan)
}
}()
// wait at most 10ms for an error to happen
go func(){
time.Sleep(10 * time.Millisecond)
errorChan <- "happy"
}
runResult <- errorChan
// further processing.
I haven't tested this code, it also needs to do some clean up of the Wait
go routine, but hopefully the logic is clear.
regards,
Vadim.
On Fri, Mar 9, 2018 at 3:18 PM Michele Sciabarra <[email protected]>
wrote:
> > I would prefer it not be there, but can see the convenience of detecting
> > that an app has immediately crashed. If we can find another way to do
> > that via process inspection, that would be better in my view.
> >
> The problem can be summarised into this code:
>
> // this command exits
> cmd := exec.Command("true")
> out, err := cmd.StdoutPipe()
>
> err = cmd.Start()
> fmt.Println(err)
> // this is nil! no error!
>
> // even worse! attempted to detect
> err = cmd.Process.Signal(syscall.Signal(0))
> // this is nil too! no error!
> fmt.Println(err)
>
> So, how can I check the process is actually terminated ?
>
