fork/exec with input redirection

[hdante]

On Nov 27, 12:09 am, hdante <hda... at gmail.com> wrote:
> On Nov 26, 7:58 pm, "Dan Upton" <up... at virginia.edu> wrote:
>
>
>
> > I have a Python script that does a fork/exec, so the parent process
> > can get the child's PID and monitor /proc/PID/stat (on a CentOS
> > system).  Most of my processes' command lines are straightforward
> > enough to do this with, but I have a handful that use < on the command
> > line, eg
>
> > ./gobmk_base.linux_x86 --quiet --mode gtp < 13x13.tst
>
> > The only thing I could really think of to try was
>
> >    os.execv("./gobmk_base.linux_x86", ["./gobmk_base.linux_x86",
> > "--quiet", "--mode", "gtp", "<", "13x13.tst"])
>
> > but this apparently doesn't work.  Is there some other way to
> > accomplish what I'm going for?
>
> > Thanks,
> > -dan
>
>  IIRC,
>
>  if os.fork() == 0:
>    new_stdin = os.open('13x13.tst')
>    os.dup2(new_stdin, sys.stdin.fileno())
>    os.close(new_stdin)
>    os.execv("./gobmk_base.linux_x86", ["./gobmk_base.linux_x886", "--
> quiet", "--mode", "gtp"])

 Maybe a sys.stdin.flush() just to be sure ?