Hi,
This question is about issues with Twisted on OSX. It might be too
twistd specific, the issue has popped up in other OSX 10.6 / python
contexts. So I will give it a shot.
Last year I struggled with crashes in a process using twisted.web,
Quartz and OSX 10.6:
http://mail.python.org/pipermail/pythonmac-sig/2009-December/022006.html
Taking a fresh look (and some excellent help from a friend) I've
managed to remove Quartz from the suspect list. The daemonising
function in twisted calls fork(), but not exec(), similar to this bug:
http://bugs.python.org/issue7895
The
USING_FORK_WITHOUT_EXEC_IS_NOT_SUPPORTED_BY_FILE_MANAGER
flag shows up in crash reports.
- Has anyone seen this specific problem with Twisted and 10.6?
- What are the best practices for dealing with this issue?
- Take it to the twisted list after all?
- Any pointers welcome!
The relevant code in twisted: _twistd_unix.py (in /twisted/scripts/).
exec() - where? how?
def daemonize():
# See http://www.erlenstar.demon.co.uk/unix/faq_toc.html#TOC16
if os.fork(): # launch child and...
os._exit(0) # kill off parent
os.setsid()
if os.fork(): # launch child and...
os._exit(0) # kill off parent again.
null = os.open('/dev/null', os.O_RDWR)
for i in range(3):
try:
os.dup2(null, i)
except OSError, e:
if e.errno != errno.EBADF:
raise
os.close(null)
Thanks,
Erik_______________________________________________
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