Modernize siginterrupt calls

[pablogsal]

BPO	41675
Nosy	@pablogsal
PRs	bpo-41675: Modernize siginterrupt calls #22028

^{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 2020-09-02.14:29:25.017>
created_at = <Date 2020-08-31.13:51:22.816>
labels = ['3.10']
title = 'Modernize siginterrupt calls'
updated_at = <Date 2020-09-02.14:29:25.016>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2020-09-02.14:29:25.016>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2020-09-02.14:29:25.017>
closer = 'pablogsal'
components = []
creation = <Date 2020-08-31.13:51:22.816>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 41675
keywords = ['patch']
message_count = 2.0
messages = ['376152', '376241']
nosy_count = 1.0
nosy_names = ['pablogsal']
pr_nums = ['22028']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue41675'
versions = ['Python 3.10']

[pablogsal]

siginterrupt is deprecated:

./Modules/signalmodule.c:667:5: warning: ‘siginterrupt’ is deprecated: Use sigaction with SA_RESTART instead [-Wdeprecated-declarations]
667 | if (siginterrupt(signalnum, flag)<0) {

[pablogsal]

New changeset f9c5e3f by Pablo Galindo in branch 'master':
bpo-41675: Modernize siginterrupt calls (GH-22028)
f9c5e3f