os.popen4 and popen2.popen4 undocumented behavior

[Roman Yakovenko]

Hi. May be I found bug may be not, but I definitely could not find answer in documentation and GOOGLE.

Environment: Windows XP and Python 2.3

Description:

I have program that returns negative numbers as errors

int main()
{ return -1; }

import popen2
si, so = os.popen4( r'C:\TEMP\test\Debug\test.exe' )
si.close()
so.close()
Traceback (most recent call last):
File "<pyshell#15>", line 1, in -toplevel-
so.close()
IOError: (0, 'Error') si, so = popen2.popen4( r'C:\TEMP\test\Debug\test.exe' )
si.close()
so.close()

Traceback (most recent call last):
File "<pyshell#18>", line 1, in -toplevel-
so.close()
IOError: (0, 'Error')

First of all I don't understand why it makes the difference what is return value
of the process. If main will return non negative number all will work just fine.
Thanks for help.

Roman