ffi.error: struct timeval: wrong size for field 'tv_usec'

[sikmir]

$ wget https://raw.githubusercontent.com/saghul/pycares/9d0d4b78d814eabe64c7aa6639337299616a360e/examples/cares-select.py
$ python3 cares-select.py
Traceback (most recent call last):
  File "./cares-select.py", line 32, in <module>
    wait_channel(channel)
    ~~~~~~~~~~~~^^^^^^^^^
  File "./cares-select.py", line 12, in wait_channel
    timeout = channel.timeout()
  File "/usr/lib/python3/dist-packages/pycares/__init__.py", line 495, in timeout
    tv = _ffi.new("struct timeval*")
ffi.error: struct timeval: wrong size for field 'tv_usec' (cdef says 4, but C compiler says 8). fix it or use "...;" as the last field in the cdef for struct timeval to make it flexible

Debian 13 (Trixie) / armhf, python3-pycares 4.4.0-2+b3, libcares2 1.34.5-1, Python 3.13.5.

[saghul]

Interesting!

How did you compile pycares? Did you link it with the system c-ares?

[sikmir]

How did you compile pycares? Did you link it with the system c-ares?

I've just installed via apt install python3-pycares. It was fine on Debian 11 with pycares 3.1.1.

Debian package sources:

• https://salsa.debian.org/debian/pycares
• https://salsa.debian.org/debian/c-ares

[sikmir]

And there is no such problem on x86_64 debian, only on armhf debian.

[saghul]

Fix attempt: #262

Let's see if it doesn't break other architectures.

Are you able to test it by building from source?

[bdraco]

armhf is 32 bit. Are you sure you aren't using a 64 bit compiler

[sikmir]

Are you able to test it by building from source?

Sorry, I'm away right now, will be able to test a bit later.