[Twisted-Python] _twistd_unix.py / daemonize() / OSX / USING_FORK_WITHOUT_EXEC_IS_NOT_SUPPORTED_BY_FILE_MANAGER

[Erik van Blokland]

On Oct 13, 2010, at 5:52 PM, Phil Mayers wrote:

> Other info indicates this is Apple trying to be clever and "protect" 
> applications from some signal handling issues surrounding fork() with 
> libraries which aren't safe in that situation; presumably these are 
> MacOS-specific libraries?
> 
> If this really is true, then MacOS X is no longer posix-compliant in 
> those circumstances, and Twisted is going to need some work :o(
> 
> Can you share more details about the application; the context in which 
> it is started, and which system libraries it's likely to load?

Here's a compact version. The script uses OSX' Quartz to create and manipulate images. Twisted is used to wrap it as a webserver, images are served. More pointers on how to start and use it in the script itself.

The real application is more complex, it renders images for sites like this:
http://lettersetter.net/

Zip contains 1 test image, 1 script and a sample result image.
Running in no-daemon mode (the -n option) prevents the crash, but causes other issues.

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Thanks!
Erik