向bash python pty打开的进程发送信号(私人有限公司以及子流程.Popen)

Question

我使用以下代码打开linux shell，并从python脚本向其发送命令：

#!/usr/bin/env python

import sys,subprocess,pty,os,time,threading
#This script is for Linux
result=""


def SendCommand(master,cmd):#function to send a command to opened shell process
 os.write(master, cmd+"\n")

def ReadMasterTo(master):#function to read output of shell and append it to result
 global result
 while(True):
  result+=os.read(master,2048)

def Signal(pid,signalnum):#function to send Signals to a process pid,It is what CTRL+C and ... do.
 os.killpg(pid,signalnum)


master, slave = pty.openpty() # I need pty to be able to execute some commands like sudo


SHELL = ["/bin/sh","-i"]#If I use /bin/sh signalling works,but I don't have tty!
                          #If I use /bin/bash I have tty but signalling doesn't work!
                          # want both of signalling and tty!

shell = subprocess.Popen(SHELL,preexec_fn=os.setsid,stdin=slave,stdout=slave,stderr=slave,universal_newlines=True)

time.sleep(1)#sleep 1 sec for being sure shell is open


t1 = threading.Thread(target=ReadMasterTo,args=(master,))#Call ReadMasterTo() as a thread to read output of shell and append it to result
t1.daemon=True
t1.start()

print "Started!Waiting..."

print "Ping 127.0.0.1 started."

SendCommand(master,"ping 127.0.0.1")
time.sleep(5)
Signal(shell.pid,2)

print "Ping 127.0.0.1 finished."
print "Ping google.com started."

SendCommand(master,"ping google.com")
time.sleep(5)
Signal(shell.pid,2)


print "Ping operations finished."
SendCommand(master,"echo 1 > ./done")


f=open("result.txt","w")
f.write(result)
f.close()

print "Result was saved to result.txt!\n"
os.system("cat ./result.txt")
print "\nExit"
os._exit

主要问题是： SHELL=[“/bin/sh”，“-i”]#如果我使用/bin/sh信令可以工作，但我没有tty！ #如果我使用/bin/bash，我就有tty，但是信令不起作用！ #既要信号又要tty！在

如果我使用/bin/bash Signal函数，则不会终止ping进程 如果我使用/bin/sh Signal函数，但我得到以下错误：

^{pr2}$

意味着我不能使用基于tty的命令，比如sudo，。。。在

这个python脚本不是从终端运行的，它是从C调用的程序。它将结果保存到一个文件中，C程序处理它。在

在注意：对不起语言错误。我的母语不是英语