问题:

I want to execute a program in a python application, it will run in the background but eventually come to the foreground.

A GUI is used to interact with it. But controls are offered via a console on stdin and stdout. I want to be able to control it using my application's GUI, so my first idea was:

Fork
in the parent, dup2 stdin and stdout in order to access them
exec the child

Is this easily implementable in python and how? Are there alternative ways to achieve what I want, what would that be?

回答1:

This is reasonably easy using the standard Python subprocess module:

http://docs.python.org/py3k/library/subprocess.html

回答2:

That is not much complex in structure to build !

Check this example

if os.fork():
    os._exit(0)
    os.setsid()
    os.chdir("/")
    fd = os.open("/dev/null", os.O_RDWR)
    os.dup2(fd, 0)
    os.dup2(fd, 1)
    os.dup2(fd, 2)
if fd 2:
    os.close(fd)

This python code sets an id, changes the dir, opens a file and process and close !