On Jan 2, 6:09 pm, Jérôme <jer...@jolimont.fr> wrote: > Hi all. > > When a subprocess is running, it can be sent a signal with the send_signal > method : > > process = Popen( args) > process.send_signal(signal.SIGINT) > > If the SIGINT is sent while the process has already finished, an error is > raised : > > File "/usr/lib/python2.7/subprocess.py", line 1457, in send_signal > os.kill(self.pid, sig) > OSError: [Errno 3] Aucun processus de ce type > > To avoid this, I can check that the process is still alive : > > process = Popen( args) > process.poll() > if (None == process.returncode): > process.send_signal(signal.SIGINT) > > It makes safer, but there is still an issue if the process ends between > poll() and send_signal(). > > What is the clean way to avoid this race condition ?
The fundamental race condition cannot be removed nor avoided. Ideally, avoid the need to send the subprocess a signal in the first place. If it cannot be avoided, then trap the exception. Adam -- http://mail.python.org/mailman/listinfo/python-list
