fcntl module update supports FreeBSD F_KINFO flag

[devnexen]

BPO	46021
Nosy	@tiran, @koobs, @devnexen
PRs	bpo-46021: fcntl module update supporting FreeBSD's F_KINFO proposal. #30000

^{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 = None
closed_at = None
created_at = <Date 2021-12-09.09:11:35.542>
labels = []
title = 'fcntl module update supports FreeBSD F_KINFO flag'
updated_at = <Date 2021-12-09.10:14:42.766>
user = 'https://github.com/devnexen'

bugs.python.org fields:

activity = <Date 2021-12-09.10:14:42.766>
actor = 'devnexen'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['FreeBSD']
creation = <Date 2021-12-09.09:11:35.542>
creator = 'devnexen'
dependencies = []
files = []
hgrepos = []
issue_num = 46021
keywords = []
message_count = 7.0
messages = ['408088', '408093', '408096', '408097', '408100', '408102', '408103']
nosy_count = 3.0
nosy_names = ['christian.heimes', 'koobs', 'devnexen']
pr_nums = ['30000']
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue46021'
versions = []

[devnexen]

• Enabling new F_KINFO flag.
• Returning a subset of practical data from it.

[tiran]

Please update the ticket with more information

• What does the flag F_KINFO do?
• Which platforms support the F_KINFO flag?
• link to a man page or platform documentation

A ticket should contain enough information so that a reviewer can understand the purpose of a feature request.

[devnexen]

• The F_KINFO flag returns the related kinfo_file from the file descriptor.
• While F_KINFO is, at the moment, FreeBSD's specific however other BSD has kinfo_file data as well thus the possibility they support a similar feature (F_KINFO appears only around the 5th of December).
• Does not appear yet on the man page most likely due to its very recent appareance.

[devnexen]

• Got clues mostly from source code and header https://github.com/freebsd/freebsd-src/blob/794d3e8e63f4a6ebc8926030b6c937109ddc5485/sys/sys/fcntl.h#L273

[tiran]

I still have no clue what the flag is doing. Could you please describe the purpose and meaning of kinfo_file so that somebody without FreeBSD Kernel insight can understand it? Much appreciated.

The feature is not available in FreeBSD 13.0. Is it scheduled for 14.0? We typically do not wrap new Kernel or OS features until they are available in stable OS releases.

[devnexen]

Ah right then no point then if there is no support for upcoming feature, indeed it s only FreeBSD 14 scheduled next year :-)

[devnexen]

• A kinfo_file data holds file information from the kernel's perspective (like the path or the current offset), more info here https://github.com/freebsd/freebsd-src/blob/main/sys/sys/user.h#L342

[emaste]

Ah right then no point then if there is no support for upcoming feature, indeed it s only FreeBSD 14 scheduled next year :-)

It will be in the (soon to be released) 13.1

[erlend-aasland]

Superseded by #114321

[serhiy-storchaka]

Not completely. #114321 implements only the simplest part. The following issues can supersede this issue or make it easier.