subprocess + python-daemon - bug/problem?

[Andy Clegg]

Hi all,

I'm trying to daemonize a python program, and occasionally have it run
subprocesses, however I'm running into a nasty error, as follows:

"File "/users/rsg/ancl/devcocast/devcocast-svn/scripts/DaemonSpawnTes
t.py", line 5, in <module>
    subprocess.Popen('echo 1').wait()
  File "/usr/lib64/python2.5/subprocess.py", line 594, in __init__
    errread, errwrite)
  File "/usr/lib64/python2.5/subprocess.py", line 1089, in _execute_ch
ild
    os.waitpid(self.pid, 0)
OSError: [Errno 10] No child processes"

The minimal testcase showing this problem is as follows:

"import daemon
import subprocess

daemon.DaemonContext(stderr = open("fakeConsole.txt","w+")).open()
subprocess.Popen('echo 1').wait()"

So there is no threading going on (I've found some bugs relating to
subprocess and threading). I'm using Fedora 10, Python 2.5.2, and
python-daemon 1.4.6 from here http://pypi.python.org/pypi/python-daemon/
.

If anyone can shed some light on the situation, I'd be extremely
grateful!

Yours,

Andy