Re: [Pythonmac-SIG] urllib2.urlopen fails in a forked daemon with a CoreFoundation error
On Sun, Mar 15, 2009 at 9:13 PM, Bill Janssen jans...@parc.com wrote: You need to do an exec after doing a fork. /usr/bin/python on OS X is a framework build, and some (most?) of the OS X frameworks just don't work after doing a fork. You have to restart with an exec. All right, but how is this done? I'll refer to the code I'm using: http://code.activestate.com/recipes/278731/ The first fork happens at line 55, and the second at line 103. As said, I really don't understand this fork/exec business so I don't know what I should do. Which of the many exec* functions in the os module should I run, and with what parameters? The forking without exec already does everything I need it to do daemonizing-wise (except satisfy CoreFoundation), so what am I trying to accomplish? What does CF actually require me to do, and does it mess up or require further changes in the forking methodology I'm using? - Jarkko L. ___ Pythonmac-SIG maillist - Pythonmac-SIG@python.org http://mail.python.org/mailman/listinfo/pythonmac-sig
Re: [Pythonmac-SIG] How to use pythonw on Mac OS X
Samantha Bess wrote: I'm hoping you can help me. I recently purchased a screensaver called Paper Pilots. When I tried to install it, a message popped up that said, This program needs access to the screen. Please run with 'pythonw',. This is no longer required for recent versions of Python. What version of OS-X are you running? Which python? how are you starting the program? -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/ORR(206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov ___ Pythonmac-SIG maillist - Pythonmac-SIG@python.org http://mail.python.org/mailman/listinfo/pythonmac-sig
Re: [Pythonmac-SIG] Python PyGame GTK SQLAlchemy on Leopard
Chris Van Bael wrote: I want to port an application that runs on Linux and Windows perfectly to OSX. We use Python 2.5, PyGame, PyGTK and SQLAlchemy for it. Now I have a system with Leopard on it, but want to make sure what would be the best solution to get these dependencies installed on it. I remember reading on this mailinglist that there were some problems with the python included in Leopard. some, but it mostly works well -- the biggest issues to decide are: D you want to build stand-alone executables that will run on pre-leopard systems? Do the big packages you need come as binaries -- if so, for which python? That being said, I'd go with the python from python.org -- more ups to date, and usually better support by third party packages. Do I need to install another Python alongside the included python (or should I replace it)? Do not replace it -- the python.org python can be installed in addition to it, outside of system directories. As for pyGTK -- another option is a fink or macports python -- these sometimes support the unix-y stuff better. I know it's a mess! -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/ORR(206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov ___ Pythonmac-SIG maillist - Pythonmac-SIG@python.org http://mail.python.org/mailman/listinfo/pythonmac-sig
Re: [Pythonmac-SIG] urllib2.urlopen fails in a forked daemon with a CoreFoundation error
Jarkko Laiho jarkko.la...@iki.fi wrote: So ultimately the question is: how should the forking code in the recipe be modified, so that it satisfies the requirements of OS X? What does an actual, concrete exec() call look like in this case, and at what point in the code should it occur? I don't know -- you didn't post your entire program. Read the Wikipedia page and follow the refs. Here's an example: def daemon (): try: pid = os.fork() if pid 0: sys.exit(0) # parent except OSError, e: msg = fork #1 failed: (%d) %s\n % (e.errno, e.strerror) sys.stderr.write(msg) sys.exit(1) os.umask(0) # now create a new session os.setsid() # and fork into the new session try: pid = os.fork() if pid 0: sys.exit(0) # session leader exits here except OSError, e: msg = fork #2 failed: (%d) %s\n % (e.errno, e.strerror) sys.stderr.write(msg) sys.exit(1) # here you could make any changes you need to the env, like setting PYTHONPATH env = os.environ.copy() # figure out how to invoke the actual program args = [sys.executable, -c, import mycode; + mycode.realmain() ] os.execve(sys.executable, args, env) def realmain(): start_server() # the real main... # this is basically just an event-handling loop while True: try: asyncore.loop() except (KeyboardInterrupt, SystemExit), x: note(4, Exited from main loop due to exception:\n%s, ''.join(traceback.format_exception(*sys.exc_info( raise except: note(0, Exited from main loop due to exception:\n%s, ''.join(traceback.format_exception(*sys.exc_info( if __name__ == __main__ and (not sys.platform.lower().startswith(win)): daemon() ___ Pythonmac-SIG maillist - Pythonmac-SIG@python.org http://mail.python.org/mailman/listinfo/pythonmac-sig
Re: [Pythonmac-SIG] urllib2.urlopen fails in a forked daemon with a CoreFoundation error
What does an actual, concrete exec() call look like in this case, and at what point in the code should it occur? I don't know -- you didn't post your entire program. Read the Wikipedia page and follow the refs. I did and understood just about none of it. Way over my head. But: Here's an example: [...] # figure out how to invoke the actual program args = [sys.executable, -c, import mycode; + mycode.realmain() ] os.execve(sys.executable, args, env) [...] There's a technique I didn't know about. I didn't think there was any way of making an exec() call fit the existing code, but that might just do the trick. I'm pretty sure I can work with that. Thanks for your patient advice! - Jarkko L. ___ Pythonmac-SIG maillist - Pythonmac-SIG@python.org http://mail.python.org/mailman/listinfo/pythonmac-sig
Re: [Pythonmac-SIG] Python PyGame GTK SQLAlchemy on Leopard
(make sure to reply to the list, for the archives...) Chris Van Bael wrote: Yes, I absolutely do want to buil binaries that can run on 10.3.9 and 10.4! This is very important. Then you want the python.org python. Do you have the paths for the system python and the installation from python.org? system python is in: /Library/Frameworks/Python.framework/ python.org goes into: /Library/Frameworks/Python.framework/ My problem with Mac installers is that they just ask a partition in which to install the software. But I want to be sure that they install the packages into the correct python installation. (the one from python.org) If you are using an installer, then it has to be built for the python you want. Most only target one -- wxPython targets both python.org and Apple's (for Python 2.5) if you use easy_install or setup.py, be sure to run them with the python you want to use. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/ORR(206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov ___ Pythonmac-SIG maillist - Pythonmac-SIG@python.org http://mail.python.org/mailman/listinfo/pythonmac-sig
