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I'm launching a program with subprocess on Python.
In some cases the program may freeze. This is out of my control. The only thing I can do from the command line it is launched from is CtrlEsc which kills the program quickly.
Is there any way to emulate this with subprocess? I am using subprocess.Popen(cmd, shell=True) to launch the program.
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Since subprocess. call waits for the command to complete, you can't kill it programmatically. Your only recourse is to kill it manually via an OS specific command like kill .
A process can be killed by calling the Process. kill() function. The call will only terminate the target process, not child processes.
The subprocess module provides a function named call. This function allows you to call another program, wait for the command to complete and then return the return code.
This function is intended for low-level I/O and must be applied to a file descriptor as returned by os. open() or pipe() . To close a “file object” returned by the built-in function open() or by popen() or fdopen() , use its close() method.
Well, there are a couple of methods on the object returned by subprocess.Popen() which may be of use: Popen.terminate() and Popen.kill(), which send a SIGTERM and SIGKILL respectively.
For example...
import subprocess
import time
process = subprocess.Popen(cmd, shell=True)
time.sleep(5)
process.terminate()
...would terminate the process after five seconds.
Or you can use os.kill() to send other signals, like SIGINT to simulate CTRL-C, with...
import subprocess
import time
import os
import signal
process = subprocess.Popen(cmd, shell=True)
time.sleep(5)
os.kill(process.pid, signal.SIGINT)
p = subprocess.Popen("echo 'foo' && sleep 60 && echo 'bar'", shell=True)
p.kill()
Check out the docs on the subprocess module for more info: http://docs.python.org/2/library/subprocess.html
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