Handles to unix executables exec'd with CreateProcess()

[Thomas Kho]

It seems that it is not currently possible to get the exit code of a
unix program executed with _wspawnv(_P_WAIT, [unix app], [args])
because CreateProcess() does not return a handle to the new process.
_wspawnv() uses the handle to WaitForSingleObject() the end of
execution and also needs it to GetExitCodeProcess().

Is implementation of handles to unix processes something that could be
done and pass muster, or just a corner case for a feature that doesn't
add to Windows compatibility?

FWIW, my application for this is to run a shell script and get the
return value. Under Windows, I run the shell script with Cygwin; under
Wine, I had originally planned to execute it directly.

Regards,

Tommy

[Eric Pouech]

Thomas Kho wrote:
> It seems that it is not currently possible to get the exit code of a
> unix program executed with _wspawnv(_P_WAIT, [unix app], [args])
> because CreateProcess() does not return a handle to the new process.
> _wspawnv() uses the handle to WaitForSingleObject() the end of
> execution and also needs it to GetExitCodeProcess().
>
> Is implementation of handles to unix processes something that could be
> done and pass muster, or just a corner case for a feature that doesn't
> add to Windows compatibility?
>
> FWIW, my application for this is to run a shell script and get the
> return value. Under Windows, I run the shell script with Cygwin; under
> Wine, I had originally planned to execute it directly.
> the point is even larger: a unix subprocess doesn't get a handle, so all 
> the operations requiring such handle don't work (suspend/resume, 
> debugging, waiting for the end of sub process, exit code, priority, 
> affinity, enumeration...)

One of the easiest way would be to use a wrapper (being a winelib app), 
that could work around some of the issues (wait for the end, exit code, 
enumeration - to some extent -...). Including this behavior directly 
into wine kernel code would be more complicated, still doable.

That wrapper would be simpler than winevdm (as it shouldn't support 
inter-process communication).

A+
-- 
Eric Pouech