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[rndblnch]

Python segfaults when calling a python function wrapped with c types into a c function pointer (aka callback function in ctypes terminology [0]).

After some investigations [1], it looks like the libffi which is used by ctypes to create c function pointer needs to have access to a memory region which is both writable and executable, which is not possible on the iPhoneOS.

The same issue for pyobjc is probably fixed in [2] but adapting the fix to libffi is not straightforward for the author of the ticket :)

It's also worth mentioning that libffi provides a fallback mechanism using temporary files mapped in memory, but I've not been able to make it work.

0. callback function <http://www.python.org/doc/2.5.2/lib/ctypes-callback-functions.html>

1. bug in ctypes/libffi <http://www.telesphoreo.org/pipermail/iphone-python/2008-October/000201.html>

2. patch to pyobjc fixing the same issue <http://www.telesphoreo.org/browser/trunk/data/pyobjc/mprotect.diff>

[rndblnch]

forgot to give a test case, here is an typical interactive session :

podet:~ root# uname -mprs 
Darwin 9.4.1 iPod1,1 arm
podet:~ root# python
Python 2.5.1 (r251:54863, xx/xx/xx, xx:xx:xx) 
[GCC 4.2.1 (Based on Apple Inc. build 5555)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from ctypes import *
>>> cf = CFUNCTYPE(None)
>>> def test(): pass
... 
>>> test()
>>> ctest = cf(test)
>>> ctest()
Bus error
podet:~ root# 

the line ctest = cf(test) produce the following line in the syslog: Nov 10 13:09:27 podet kernel[0]: EMBEDDED: vm_map_enter curprot cannot be write+execute. turning off execute and the last line produce the crash with the following report:

Process:         python [22134]
Path:            /usr/bin/python
Identifier:      python
Version:         ??? (???)
Code Type:       ARM (Native)
Parent Process:  sh [16028]

Date/Time:       2008-11-10 13:09:31.496 +0100
OS Version:      iPhone OS 2.1 (5F137)
Report Version:  103

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00008fe0
Crashed Thread:  0

Thread 0 Crashed:
0   ???                                 0x00008fe0 0 + 36832
1   _ctypes.dylib                       0x0013809c 0x12d000 + 45212
2   _ctypes.dylib                       0x0012ff84 0x12d000 + 12164
3   libpython2.5.dylib.1.0              0x001b1524 0x1a6000 + 46372
4   libpython2.5.dylib.1.0              0x0027b4a8 0x1a6000 + 873640
5   libpython2.5.dylib.1.0              0x0027ecf4 0x1a6000 + 888052
6   libpython2.5.dylib.1.0              0x0027f4c4 0x1a6000 + 890052
7   libpython2.5.dylib.1.0              0x002aa990 0x1a6000 + 1067408
8   libpython2.5.dylib.1.0              0x002aac10 0x1a6000 + 1068048
9   libpython2.5.dylib.1.0              0x002aad60 0x1a6000 + 1068384
10  libpython2.5.dylib.1.0              0x002b6f98 0x1a6000 + 1118104
11  python                              0x00001f78 0x1000 + 3960
12  python                              0x00001ec4 0x1000 + 3780
13  python                              0x00001d60 0x1000 + 3424

Thread 0 crashed with ARM Thread State:
    r0: 0x003d8d84    r1: 0x2fffe744      r2: 0x00000000      r3: 0x00000001
    r4: 0x2fffe798    r5: 0x2fffe774      r6: 0x00000000      r7: 0x2fffe760
    r8: 0x2fffe774    r9: 0x3941d6d0     r10: 0x003d8fb8     r11: 0x2fffe724
    ip: 0x00008fe0    sp: 0x2fffe724      lr: 0x003d88c0      pc: 0x00008fe0
  cpsr: 0x80000010

Binary Images:
    0x1000 -     0x1fff +python ??? (???) /usr/bin/python
   0x43000 -    0x4bfff  libgcc_s.1.dylib ??? (???) <ba28db7055013d2a79c7a82df3eb1a88> /usr/lib/libgcc_s.1.dylib
   0xc6000 -    0xc7fff  readline.dylib ??? (???) /usr/lib/python2.5/lib-dynload/readline.dylib
  0x12d000 -   0x13ffff  _ctypes.dylib ??? (???) /usr/lib/python2.5/lib-dynload/_ctypes.dylib
  0x1a6000 -   0x2eefff  libpython2.5.dylib.1.0 ??? (???) /usr/lib/libpython2.5.dylib.1.0
  0x34c000 -   0x371fff  libreadline.5.2.dylib ??? (???) /usr/lib/libreadline.5.2.dylib
  0x3d7000 -   0x3d8fff  libffi.4.dylib ??? (???) /usr/lib/libffi.4.dylib
  0x3e4000 -   0x3e8fff  _struct.dylib ??? (???) /usr/lib/python2.5/lib-dynload/_struct.dylib
  ...

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