On Mon, Aug 19, 2024 at 5:23 AM Johannes Berg <johan...@sipsolutions.net> wrote: > > On Tue, 2024-08-13 at 16:47 -0700, Maciej Żenczykowski wrote: > > Without this patch: > > #!/usr/bin/python3 > > import ctypes > > import os > > personality = ctypes.CDLL(None).personality > > personality.restype = ctypes.c_int > > personality.argtypes = [ctypes.c_ulong] > > PER_LINUX32=8 > > personality(PER_LINUX32) > > print(os.uname().machine) > > returns: > > x86_64 > > instead of the desired: > > i686 > > > > But ... why should it work? UML has no 32-bit compat support anyway.
Well, that's certainly a fair point. On 'native' x86_64 this works even for 64-bit processes though. I wonder if that, in itself, is a feature or a bug... In my case I was writing some debug code (to print the environment some test code is running in, since I think it was failing due to running 32-bit code in PER_LINUX32 on 64-bit arm) and testing (the test code) on x86_64 UML. I was surprised to discover the difference in UML vs my host desktop. > johannes -- Maciej Żenczykowski, Kernel Networking Developer @ Google
