Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #14991

Re: spawnl issues with Win 7 access rights

Show key headers only | View raw

On 10/25/2011 8:19 AM, Tim Golden wrote:
> On 25/10/2011 08:01, Propad wrote:
>> Thnx again for all the answers. As stated before, I'm limited in my
>> options. One of them just might be to switch to Python 2.5, rewrite
>> the code that crashes using the subprocess module, and then somehow
>> patch the library I use (which I'm not suposed to do, but... oh
>> well :-)). I can just hope subrocess was already mature adn offering
>> the relevant functionality in 2.5.
>
> I must admit I'm more than slightly surprised by this. My test case
> is to use os.spawnl to run c:/windows/notepad.exe. From the docs,
> I would expect to use os.spawnl (os.P_WAIT, "c:/windows/notepad.exe").
> (I only want to open notepad.exe; there's no need for additional args).
>
> These are my test cases:
>
> (1)
>
> os.spawnl (
> os.P_WAIT,
> "c:/windows/notepad.exe"
> )
>
> (2)
>
> os.spawnl (
> os.P_WAIT,
> "c:/windows/notepad.exe",
> "c:/windows/notepad.exe"
> )
>
> (3)
>
> os.spawnl (
> os.P_WAIT,
> "c:/windows/notepad.exe",
> "c:/windows/notepad.exe",
> "c:/temp.txt"
> )
>
>
> And the results:
>
> ==============================================================
> Python | Platform | Case | Result
> --------------------------------------------------------------
> 2.2.2 | WinXP | 1 | Works (empty notepad)
> 2.2.2 | WinXP | 2 | Works (empty notepad)
> 2.2.2 | WinXP | 3 | Works (notepad temp.txt)
> --------------------------------------------------------------
> 2.2.2 | Win7 | 1 | OSError
> 2.2.2 | Win7 | 2 | Works (empty notepad)
> 2.2.2 | Win7 | 3 | Works (notepad temp.txt)
> --------------------------------------------------------------
> 2.7.2 | WinXP | 1 | Crashes
> 2.7.2 | WinXP | 2 | Works (empty notepad)
> 2.7.2 | WinXP | 3 | Works (notepad temp.txt)
> --------------------------------------------------------------
> 2.7.2 | Win7 | 1 | Crashes
> 2.7.2 | Win7 | 2 | Works (empty notepad)
> 2.7.2 | Win7 | 3 | Works (notepad temp.txt)
> ==============================================================
>
>
> Add to this a look at the mscrt source which ships with VS 2008
> and the MSDN docs for spawnl:
>
> http://msdn.microsoft.com/en-us/library/wweek9sc%28v=vs.80%29.aspx
>
> and we see that the first args parameter must be the same as the
> path parameter.
>
> FWIW, at no extra cost, I went to the trouble of testing it on some
> flavour of Linux with Python 2.6 and got the same results
> as per 2.2.2 on WinXP. (Basically: everything works).
>
> Which leaves us with http://bugs.python.org/issue8036 in which recent
> versions of Python crash when the (arbitrary) second parameter isn't
> passed. And with an inexplicable behaviour change between the same
> version of Python running on WinXP and on Win7.

OP reports 2.6 with XP works. Did that use VS 2005? Maybe C runtime 
changed (regressed). Also, could there be a 32 v. 64 bit issue?

-- 
Terry Jan Reedy

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

spawnl issues with Win 7 access rights Propad <npropadovic@googlemail.com> - 2011-10-24 05:43 -0700
  Re: spawnl issues with Win 7 access rights Tim Golden <mail@timgolden.me.uk> - 2011-10-24 14:18 +0100
    Re: spawnl issues with Win 7 access rights Propad <npropadovic@googlemail.com> - 2011-10-24 06:47 -0700
      Re: spawnl issues with Win 7 access rights Terry Reedy <tjreedy@udel.edu> - 2011-10-24 18:16 -0400
  Re: spawnl issues with Win 7 access rights Tim Golden <mail@timgolden.me.uk> - 2011-10-24 15:18 +0100
  Re: spawnl issues with Win 7 access rights Terry Reedy <tjreedy@udel.edu> - 2011-10-24 18:14 -0400
  Re: spawnl issues with Win 7 access rights Miki Tebeka <miki.tebeka@gmail.com> - 2011-10-24 17:21 -0700
    Re: spawnl issues with Win 7 access rights Propad <npropadovic@googlemail.com> - 2011-10-25 00:01 -0700
      Re: spawnl issues with Win 7 access rights Tim Golden <mail@timgolden.me.uk> - 2011-10-25 13:19 +0100
      Re: spawnl issues with Win 7 access rights Terry Reedy <tjreedy@udel.edu> - 2011-10-25 21:11 -0400
      Re: spawnl issues with Win 7 access rights Tim Golden <mail@timgolden.me.uk> - 2011-10-26 15:38 +0100
      Re: spawnl issues with Win 7 access rights Terry Reedy <tjreedy@udel.edu> - 2011-10-26 15:20 -0400
        Re: spawnl issues with Win 7 access rights Propad <npropadovic@googlemail.com> - 2011-10-27 03:27 -0700
          Re: spawnl issues with Win 7 access rights Tim Golden <mail@timgolden.me.uk> - 2011-10-27 11:36 +0100
          Re: spawnl issues with Win 7 access rights Terry Reedy <tjreedy@udel.edu> - 2011-10-27 15:53 -0400
          Re: spawnl issues with Win 7 access rights Tim Golden <mail@timgolden.me.uk> - 2011-10-28 09:22 +0100

csiph-web