如何使用Python2.7.6设置subprocess.call超时？

Answer 1

您可以安装来自Python 3.2/3.3的subprocess模块的后台端口^{} modulementioned by @gps，以便在2.x上使用。它在Python 2.7上工作，并且包括来自python3.3的超时支持。

^{} is just ^{}因此要在timeout秒内中断长时间运行的进程：

#!/usr/bin/env python
import time
from subprocess import Popen

p = Popen(*call_args)
time.sleep(timeout)
try:
    p.kill()
except OSError:
    pass # ignore
p.wait()

如果子进程可能提前结束，则可移植的解决方案是use ^{} as suggested in @sussudio's answer：

#!/usr/bin/env python
from subprocess import Popen
from threading import Timer

def kill(p):
    try:
        p.kill()
    except OSError:
        pass # ignore

p = Popen(*call_args)
t = Timer(timeout, kill, [p])
t.start()
p.wait()
t.cancel()

在Unix上，您可以use ^{} as suggested in @Alex Martelli's answer：

#!/usr/bin/env python
import signal
from subprocess import Popen

class Alarm(Exception):
    pass

def alarm_handler(signum, frame):
    raise Alarm

signal.signal(signal.SIGALRM, alarm_handler)


p = Popen(*call_args)
signal.alarm(timeout)  # raise Alarm in 5 minutes
try:
    p.wait()
    signal.alarm(0)  # reset the alarm
except Alarm:
    p.kill()
    p.wait()

为了避免在这里使用线程和信号，Python 3上的subprocess模块使用了busy loop with ^{} calls on Unix和^{} on Windows。