STINNER Victor <vstin...@python.org> added the comment:
I was surprised by the following test in StructUnionType_paramfunc():
if ((size_t)self->b_size > sizeof(void*)) {
... copy the structure ...
} else {
... pass by reference (?) ...
}
So I wrote a simple C library with the structure: typedef struct Point { int x;
int y; } and functions modifying this structure, structured passed by copy or
structure passed by reference.
I'm surprised: ctypes works as expected :-)
Try attached point.c and point.py:
$ gcc -c point.c -fpic && gcc -shared -o libpoint.so point.o && python3 point.py
p = <Point x=1 y=2>
p = <Point x=1 y=2>
p = <Point x=0 y=0>
ok
sizeof(Point) = 16 bytes
Modify CoordType in point.c and point.py to test different sizes, on x86-64, I
get:
* c_byte: 2 bytes
* c_short: 4 bytes
* c_int: 8 bytes
* c_long: 16 bytes
----------
keywords: +3.8regression
versions: +Python 3.9
Added file: https://bugs.python.org/file48574/point.c
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<https://bugs.python.org/issue37140>
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