Autoreloader hides signal exits from child

[Glenn Maynard]

When the autoreloader is active, if the child (main) Python process exits with a signal, the signal is neither passed to the real parent nor displayed at all: the server silently exits. This makes interpreter crashes confusing until you realize what's going on.

[Glenn Maynard]

print signals

[Preston Holmes]

not really testable, but should provide more information to user who hits this edgecase

[Aymeric Augustin]

I'm uploading a new patch that passes the signal to the parent. Thus, the shell can display something useful — for instance with bash:

Shell 1:

$ PYTHONPATH=../django-trunk ./manage.py runserver                                                              
Validating models...

0 errors found
Django version 1.4 alpha 1 SVN-17289, using settings 'tz_demo.settings'
Development server is running at http://127.0.0.1:8000/
Quit the server with CONTROL-C.

Shell 2:

$ pstree | grep Python                                                                                                                                                                                                     ~
 | | |     \-+= 37217 myk /opt/local/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python ./manage.py runserver
 | | |       \--- 37218 myk /opt/local/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python ./manage.py runserver
 | |     \--- 37220 myk grep Python
$ kill 37218    # kills the child

Shell 1:

Terminated: 15

[Aymeric Augustin]

In [17296]:

Fixed #10725 -- When the child process spawned by the autoreloader gets killed by a signal, passed the signal to the parent, in order to make debugging easier.