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From: David Naylor <dbn@freebsd.org>
To: freebsd-python@freebsd.org
Subject: ctypes not working (Fwd: [pypy-dev] 2.6.1 and freebsd-9)
Date: Mon, 24 Aug 2015 23:11:32 +0200
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Hi list,
Please see the correspondence below from the pypy team about some faili=
ng=20
tests. Specifically, why is test.py producing None whereas test.c is=20=
producing the desired results? =20
Regards
=2D--------- Forwarded Message ----------
Subject: Re: [pypy-dev] 2.6.1 and freebsd-9
Date: Monday, 24 August 2015, 23:07:20
From: David Naylor <naylor.b.david@gmail.com>
To: pypy-dev@python.org
CC: Matti Picus <matti.picus@gmail.com>
On Saturday, 22 August 2015 21:25:44 Matti Picus wrote:
> I would like to add the freebsd-9-x86-64 binary tgz to our released
> downloads. We still have a number of failing tests showing up on
> http://buildbot.pypy.org/summary?category=3Dfreebsd64
> among them many
> DLOpenError: "opening 'libm.so' with ctypes.CDLL() works, but not wit=
h
> c_dlopen()??"
> and the more worrying SIGSEGV in
> http://buildbot.pypy.org/summary/longrepr?testname=3Dunmodified&build=
er=3Dpypy-c
> -jit-freebsd-9-x86-64&build=3D655&mod=3Dlib-python.2.7.test.test_io
>=20
> Could someone proficient in freebsd suggest what is going on?
Hi Matti,
I am able to reproduce this on FreeBSD 10.2:
# cat > test.py << __EOF
from=20ctypes import *
libc =3D CDLL("libc.so.7")
dlopen =3D libc["dlopen"]
# see <dlfnc.h>: void *dlopen(const char *, int);
dlopen.argtypes =3D [c_char_p, c_int]
dlopen.restype =3D c_void_p
print dlopen(c_char_p("libm.so"), c_int(0))
__EOF
# python test.py
None
However, contract this with the C equivalent:
# cat > test.c << __EOF
#include <dlfcn.h>
#include <stdio.h>
int main(int argc, char** argv)
{
printf("%p\n", dlopen("libm.so", RTLD_LOCAL));
}
__EOF
# cc -o test test.c
# ./test
0x800620800
<snip/>
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