Wow! A channel and 2 go routines for that checking a process exited. I
wrote a similar code except I did not think to using a timeout to always
unlock the channel. So yes, that could work thanks. I posted here
exactly to get a help like this. Will try.
--
Michele Sciabarra
openwh...@sciabarra.com
On Sat, Mar 10, 2018, at 9:47 PM, Vadim Raskin wrote:
> >> 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
> <mich...@sciabarra.com>> 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 ?
> >
