STINNER Victor added the comment:
> You could do both: use the O_CLOEXEC flag and do a fcntl() call on POSIX
This is the best-effort option. It was already discussed and rejected in the
issue #12760.
We had a similar discussion for the PEP 418 on monotonic clock. The final
decision is not only provide time.monotonic() if the OS supports monotonic
clock.
Using an exception, a developer can develop its own best-effort function:
try:
fileobj = open(filename, "e")
except NotImplementedError:
fileobj = open(filename, "r")
# may also fail here if the fcntl module is missing
import fcntl
flags = fcntl.fcntl(self.socket, fcntl.F_GETFD)
fcntl.fcntl(fileobj, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
We may expose the best-effort function somewhere else, but not in open() which
must be atomic in my opinion.
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