[Twisted-Python] spawnProcess under Win32
mli at deform.com
Mon Aug 14 11:34:48 EDT 2006
I've recently fixed a problem in MPI 1.2.1 launching program RemoteShell.
It uses CreateProcessAsUser to spawn a process. The RemoteShell runs
as a service(daemon) and spawn a new process perfectly (without DOS
window). The followings are C-code, it might give you some hint.
NULL, NULL, TRUE,
//DETACHED_PROCESS | IDLE_PRIORITY_CLASS,
//CREATE_NO_WINDOW | IDLE_PRIORITY_CLASS,
CREATE_NO_WINDOW | IDLE_PRIORITY_CLASS |
//DETACHED_PROCESS | IDLE_PRIORITY_CLASS |
//CREATE_NO_WINDOW | IDLE_PRIORITY_CLASS | CREATE_SUSPENDED,
Igor Kravtchenko wrote:
> yes I see your point of view.
> I deliberately passed that Win32 flags since I didn't wanted to get in
> of what kind of Win32 features we need or not.
> It can indeed potentially breaks Twisted behavior if incorrect flags
> are passed.
> However it's just easier even if less secure. Otherwise, you have to
> all kind of features users want and implement them explicitly while
> having the
> correct code guard to prevent from crash or incorrect behavior.
> I don't know about other Win32 developpers. From my side, I just wanted
> a way to prevent a console to be opened, so might be something like an
> explicit CREATE_NO_CONSOLE flag or such.
> glyph at divmod.com wrote:
>> On Mon, 14 Aug 2006 15:15:55 +0200, Igor Kravtchenko
>> <igor at mekensleep.com> wrote:
>>> I've looked at the way Twisted creates a process under Win32 and
>>> I've noticed
>>> that it uses the CreateProcess() function. The problem is it
>>> doesn't mention any
>>> creation flags (i.e.: it just passes 0) whereas here, we would need
>>> to pass
>>> DETACHED_PROCESS to avoid a new console to be created.
>>> I would be interested to know what do you think about this?
>>> Does it seem to you a good idea?
>> Well, we do have a UNIX-specific argument to spawnProcess (usePTY),
>> so I don't see why we couldn't have a Win32-specific argument as
>> well. However, "win32flags" seems like a pretty vague name,
>> especially since it could be CreateProcess's dwCreationFlags argument
>> or STARTUPINFO's dwFlags attribute.
>> Also, depending on context, you might want CREATE_NO_WINDOW or
>> DETACHED_PROCESS or possibly both.
>> I believe the right thing to do is to come up with some typical
>> features of the Windows process environment and support them
>> explicitly. I don't believe all the flags you can pass to
>> CreateProcess are compatible with the way Twisted expects
>> subprocesses to behave, and I am definitely sure that not all the
>> things you can put in STARTUPINFO are.
>> Twisted-Python mailing list
>> Twisted-Python at twistedmatrix.com
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