> Is this interesting Python output? ... > > Fatal Python error: GC object already tracked > Abort trap > > ... tell me I can help by solving it, and > I'll look more closely.
Sorry, never mind, not interesting after all. Newbie me did somehow forget the fact that ctypes.memmove doesn't bounds-check, e.g. there is no error raised by overwriting memory not owned, which then naturally degrades the stability of the GC etc. >>> import ctypes >>> >>> bytes = (3 * ctypes.c_ubyte)() >>> bytes[0], bytes[1], bytes[2] (0, 0, 0) >>> CP = ctypes.POINTER >>> ctypes.cast(ctypes.addressof(bytes) + 3, CP(ctypes.c_ubyte)).contents.value 0 >>> >>> result = ctypes.memmove(ctypes.addressof(bytes), '\1\3\5\7', 4) >>> bytes[0], bytes[1], bytes[2] (1, 3, 5) >>> ctypes.cast(ctypes.addressof(bytes) + 3, CP(ctypes.c_ubyte)).contents.value 7 >>> -- http://mail.python.org/mailman/listinfo/python-list
