使用popen和专用的TTY Python运行交互式Bash [英] Run interactive Bash with popen and a dedicated TTY Python

问题描述

我需要使用自己的专用TTY在Python的单独进程中运行交互式Bash实例(我不能使用pexpect). 我使用了我通常在类似程序中看到的以下代码段:

I need to run an interactive Bash instance in a separated process in Python with it's own dedicated TTY (I can't use pexpect). I used this code snippet I commonly see used in similar programs:

master, slave = pty.openpty()

p = subprocess.Popen(["/bin/bash", "-i"], stdin=slave, stdout=slave, stderr=slave)

os.close(slave)

x = os.read(master, 1026)

print x

subprocess.Popen.kill(p)
os.close(master)

但是当我运行它时，会得到以下输出:

But when I run it I get the following output:

$ ./pty_try.py
bash: cannot set terminal process group (10790): Inappropriate ioctl for device
bash: no job control in this shell

运行轨迹显示一些错误:

Strace of the run shows some errors:

...
readlink("/usr/bin/python2.7", 0x7ffc8db02510, 4096) = -1 EINVAL (Invalid argument)
...
ioctl(3, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7ffc8db03590) = -1 ENOTTY (Inappropriate ioctl for device)
...
readlink("./pty_try.py", 0x7ffc8db00610, 4096) = -1 EINVAL (Invalid argument)

该代码段似乎很简单，Bash是否没有得到所需的东西?这可能是什么问题?

The code snippet seems pretty straightforward, is Bash not getting something it needs? what could be the problem here?

推荐答案

这是最后对我有用的解决方案(由qarma建议):

This is the solution that worked for me at the end (as suggested by qarma) :

libc = ctypes.CDLL('libc.so.6')

master, slave = pty.openpty()
p = subprocess.Popen(["/bin/bash", "-i"], preexec_fn=libc.setsid, stdin=slave, stdout=slave, stderr=slave)
os.close(slave)

... do stuff here ...

x = os.read(master, 1026)
print x

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