[python-win32] Spawning processes with os module

[Paul Moore]

On 10/27/05, Christian Junker <christianjunker at gmail.com> wrote:
> I am having difficulty spawning processes with the os.P_NOWAIT and the
> waitpid function in the os module. What I simply want to do is to
> launch another process along with immediately getting its exit status
> in a cross-platform supported way. However the exit status is actually
> shifted 8 bits left on Win32 and when manually shifting it back, I
> always get 1 as the exit status although the process has obviously
> been started successfully.

I'm a bit confused. You say you are using P_NOWAIT, and yet you want
the exit status "immediately"? os.spawnXX with P_NOWAIT returns a
process ID. This can be used in os.waitpid to get the exit status,
shifted left 8 bits, once the process does exit. But if you're just
doing

    pid = os.spawnXX(...P_NOWAIT)
    pid, status = os.waitpid(pid)
    status = status >> 8

you may as well have used P_WAIT in the first place...

Maybe if you posted some example code showing what you are trying to
do, it may make your problem clearer.

Paul.