python subprocess模块 监控子进程的2种方式 忙等待和立即返回同时设置子进程超时时间 - 转

import subprocess
import os
import time
tt = '555'
cmd = "python /home/100003/python/mypython/sub2.py "+" 333"+" 444 "+tt
print time.time()
sub2 = subprocess.Popen(cmd, shell=True)
while 1:
ret1 = subprocess.Popen.poll(sub2)
if ret1 == 0:
print sub2.pid,'end'
break
elif ret1 is None:
print  'running'
time.sleep(1)
else:
print sub2.pid,'term'
break
print time.time()

import subprocess
import select
import time
import signal
import os

tt = '555'
cmd = "python /home/100003/python/mypython/sub2.py "+" 333"+" 444 "+tt
timeout = 3
pro = subprocess.Popen(cmd, stdout=subprocess.PIPE,shell = True)
print time.time()
while 1:
while_begin = time.time()
print 'timeout',timeout
fs = select.select([pro.stdout], [], [], timeout)
if pro.stdout in fs[0]:
tmp = pro.stdout.read()
print 'read', tmp
if not tmp:
print 'end'
print time.time()
break
else:
print 'outoftime'
print os.kill(pro.pid, signal.SIGKILL),
break
timeout = timeout - (time.time() - while_begin)