import subprocess
import os
r=open("sad.txt",'a')
p = subprocess.Popen("ssh.exe root@192.168.58.154", stdin = subprocess.PIPE, stdout = subprocess.PIPE, stderr = subprocess.PIPE, shell = False)
p.stdin.write('password\n')
p.stdin.write('ifconfig\n')
while p.stdout.readline()!=' ':
line = p.stdout.readline() #如果p.stdout中内容被读完之后,程序会卡在这里
#line = line.strip()
print line
r.write(line)
这个卡死如何解决,这时候结束当前进程也没办法结束
或者如何判断卡死,然后p.kill()或“ctrl+c”当前进程
ssh执行p.stdin.write('exit\n')也不行,因为ssh exit之后还会跳回登录界面,进程还是没有结束
ringa_lee2017-04-18 09:05:10
while p.stdout.readline()!=' ':
line = p.stdout.readline() #如果p.stdout中内容被读完之后,程序会卡在这里
#line = line.strip()
print line
r.write(line)
First of all, I point out that there is a problem with this paragraph. This is a printing problem. p.stdout.readline() != '' should not be placed in a while, because after the data is read, it will be discarded, so The complete data cannot be printed or written to the sad.txt file. Secondly, I think p.stdout should be made non-blocking to solve the stuck problem
import subprocess
import os
import fcntal
r=open("sad.txt",'a')
p = subprocess.Popen("ssh.exe root@192.168.58.154", stdin = subprocess.PIPE, stdout = subprocess.PIPE, stderr = subprocess.PIPE, shell = False)
flags = fcntl.fcntl(p.stdout, fcntl.F_GETFL)
flags |= os.O_NONBLOCK
fcntl.fcntl(p.stdout, fcntl.F_SETFL, flags)
p.stdin.write('password\n')
p.stdin.write('ifconfig\n')
while True:
try:
line = p.stdout.readline() #如果p.stdout中内容被读完之后,程序会卡在这里
if line == '':
break
#line = line.strip()
print line
r.write(line)
except IOError:
break
高洛峰2017-04-18 09:05:10
The reason why it gets stuck is because the pipe is empty after reading the last line, and for the ifconfig
command, the last line is not a space but n:
p.stdin.write('ifconfig eth0\n')
for line in iter(p.stdout.readline, '\n'):
print line.strip()
To prevent death caused by IO, the officially recommended method is to use communicate
, such as this:
out, err = p.communicate('ifconfig')