[New-bugs-announce] [issue26716] EINTR handling in fcntl

[Jack Zhou]

New submission from Jack Zhou:

According to PEP 475, standard library modules should handle EINTR, but this appears to not be the case for the fcntl module.

Test script:


import fcntl
import signal
import os


def handle_alarm(signum, frame):
    print("Received alarm in process {}!".format(os.getpid()))


child = os.fork()
if child:
    signal.signal(signal.SIGALRM, handle_alarm)
    signal.alarm(1)
    with open("foo", "w") as f:
        print("Locking in process {}...".format(os.getpid()))
        fcntl.flock(f, fcntl.LOCK_EX)
        print("Locked in process {}.".format(os.getpid()))
        os.waitpid(child, 0)
else:
    signal.signal(signal.SIGALRM, handle_alarm)
    signal.alarm(1)
    with open("foo", "w") as f:
        print("Locking in process {}...".format(os.getpid()))
        fcntl.flock(f, fcntl.LOCK_EX)
        print("Locked in process {}.".format(os.getpid()))

----------
components: IO
messages: 263042
nosy: Jack Zhou
priority: normal
severity: normal
status: open
title: EINTR handling in fcntl
type: behavior
versions: Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26716>
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