add signal.pidfd_send_signal

[benjaminp]

BPO	38712
Nosy	@benjaminp, @njsmith
PRs	closes bpo-38712: Add signal.pidfd_send_signal. #17070

^{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 = <Date 2019-11-20.04:39:20.824>
created_at = <Date 2019-11-06.05:08:46.932>
labels = ['library', '3.9']
title = 'add signal.pidfd_send_signal'
updated_at = <Date 2019-11-20.04:39:20.822>
user = 'https://github.com/benjaminp'

bugs.python.org fields:

activity = <Date 2019-11-20.04:39:20.822>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2019-11-20.04:39:20.824>
closer = 'benjamin.peterson'
components = ['Library (Lib)']
creation = <Date 2019-11-06.05:08:46.932>
creator = 'benjamin.peterson'
dependencies = []
files = []
hgrepos = []
issue_num = 38712
keywords = ['patch']
message_count = 4.0
messages = ['356091', '356093', '356101', '357028']
nosy_count = 2.0
nosy_names = ['benjamin.peterson', 'njs']
pr_nums = ['17070']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38712'
versions = ['Python 3.9']

[benjaminp]

Add signal.pidfd_send_signal, which will wrap the Linux 5.1 syscall of the same name.

[njsmith]

I guess a bikeshed question is whether it should be os.pidfd_send_signal (like os.kill) or signal.pidfd_send_signal (like signal.pthread_kill).

I don't actually care either way myself :-)

[benjaminp]

Yes, I thought about that a bit. I choose signal because:

1. signal already has some specialized functions that send signals pthread_kill and raise_signal.
2. If we every do want to implement the third parameter of pidfd_send_signal, the signal module already defines a siginfo structseq.
3. (least convincing) os/posix has way too much stuff. I generally think that we should strive to find a good home for new OS-level functionality that isn't the os module.

[benjaminp]

New changeset 7483451 by Benjamin Peterson in branch 'master':
closes bpo-38712: Add signal.pidfd_send_signal. (GH-17070)
7483451

[GiovanniHD201E]

How I do signalisation on W10?