fcntl footnote about O_SHLOCK and O_EXLOCK is misleading

[bitdancer]

BPO	6194
Nosy	@birkenfeld, @bitdancer

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/birkenfeld'
closed_at = <Date 2009-06-08.13:35:02.473>
created_at = <Date 2009-06-04.21:38:31.803>
labels = ['easy', 'type-bug', 'docs']
title = 'fcntl footnote about O_SHLOCK and O_EXLOCK is misleading'
updated_at = <Date 2009-06-08.13:35:02.471>
user = 'https://github.com/bitdancer'

bugs.python.org fields:

activity = <Date 2009-06-08.13:35:02.471>
actor = 'georg.brandl'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2009-06-08.13:35:02.473>
closer = 'georg.brandl'
components = ['Documentation']
creation = <Date 2009-06-04.21:38:31.803>
creator = 'r.david.murray'
dependencies = []
files = []
hgrepos = []
issue_num = 6194
keywords = ['easy']
message_count = 2.0
messages = ['88904', '89079']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'r.david.murray']
pr_nums = []
priority = 'low'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue6194'
versions = ['Python 2.6', 'Python 3.0', 'Python 3.1', 'Python 2.7']

[bitdancer]

At the bottom of http://docs.python.org/library/fcntl.html there is a
"see also" section for the os module that says:

If the locking flags O_SHLOCK and O_EXLOCK are present in the os

module, the os.open() function provides a more platform-independent
alternative to the lockf() and flock() functions.

However, those flags are documented as being "unix only" (ie: no
windows), and in fact Linux does not support them. Alan Cox rejected
support for them back in 2000 according to this linux kernel posting:

http://lkml.indiana.edu/hypermail/linux/kernel/0005.1/1309.html

so it doesn't seem likely linux will ever support them.

Thus, to say that they provide a "more platform independent-alternative"
would appear to be false, since they appear to only be supported on BSD
and derivitives.

[birkenfeld]

Thanks, fixed in r73294.