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

guozhiwei

一:循环 忙等 子进程结束
 
import subprocessimport osimport timett = '555'cmd = "python /home/100003/python/mypython/sub2.py "+" 333"+" 444 "+ttprint 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'        breakprint time.time() 
 二:子进程结束 立即返回 使用select模块 同时可设置子进程的超时时间
 
import subprocessimport selectimport timeimport signalimport ostt = '555'cmd = "python /home/100003/python/mypython/sub2.py "+" 333"+" 444 "+tttimeout = 3pro = 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)