[issue12158] platform: add linux_version()

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

STINNER Victor wrote:
> 
> New submission from STINNER Victor <victor.stinner at haypocalc.com>:
> 
> Sometimes, we need to know the version of the Linux kernel. Recent examples: test if SOCK_CLOEXEC or O_CLOEXEC are supported by the kernel or not. Linux < 2.6.23 *silently* ignores O_CLOEXEC flag of open().
> 
> linux_version() is already implemented in test_socket, but it looks like test_posix does also need it.
> 
> Attached patch adds platform.linux_version(). It returns (a, b, c) (integers) or None (if not Linux).
> 
> It raises an error if the version string cannot be parsed.

The APIs in platform generally try not to raise errors, but instead
return a default value you pass in as parameter in case the
data cannot be fetched from the system.

The returned value should be a version string in a fixed
format, not a tuple. I'd suggest to use _norm_version()
for this.

Please also check whether this works on a few Linux systems.

I've checked it on openSUSE, Ubuntu.

Thanks,
-- 
Marc-Andre Lemburg
eGenix.com

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<http://bugs.python.org/issue12158>
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