New submission from Jonathan Stewmon:
Writing to sys.stdout on OS X can fail with IOError: [Errno 4] Interrupted
system call.
I have observed this while trying to write to sys.stdout when SIGCHLD is
received. The script below consistently reproduces the problem with python
2.7.2 on OS X 10.9.3.
import sys
import os
import signal
import subprocess
import time
children = {}
def claim_child():
pid, status = os.wait()
p = children.pop(pid)
def trap(sig, frame):
claim_child()
signal.signal(signal.SIGCHLD, trap)
running = 0
max_procs = 70
program = [sys.executable, '-c', 'import sys, time; print sys.version;
time.sleep(3)']
f = sys.stdout # crashes with: IOError: [Errno 4] Interrupted system call
# f = file('/tmp/eintr.log', 'w') # works just fine
while True:
while len(children) < max_procs:
f.write('starting program: {}\n'.format(program))
p = subprocess.Popen(program)
children[p.pid] = p
time.sleep(0.05)
----------
components: IO
messages: 223435
nosy: jstewmon
priority: normal
severity: normal
status: open
title: sys.stdout.write on OS X is not EINTR safe
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22007>
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