On 01/30/2013 01:00 PM, Victor Stinner wrote:
Disable inheritance by default
(...)
* It violates the principle of least surprise.  Developers using the
  os module may expect that Python respects the POSIX standard and so
  that close-on-exec flag is not set by default.

Oh, I just saw that Perl is "violating POSIX" since Perl 1:
close-on-exec flag in set on new created file descriptors if their
number is greater than $SYSTEM_FD_MAX (which is usually 2).

I haven't checked the source, but I suspect this applies only to file descriptors opened with open(), not to explicit POSIX::* calls. (The documentation of the latter doesn't mention close-on-exec at all.) Perl's open() contains functionality equivalent to Python's open() and subprocess.Popen(), the latter of which already closes on exec by default.

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