New submission from Václav Šmilauer:
I have several compiled modules linked into one .so file and import them using
imp.load_dynamic.
Only the first module imported with load_dynamic is imported properly, all
subsequent calls of load_dynamic on the same file ignore the first argument
(name) and return the first module again. The init function is also called only
for the first module imported by load_dynamic.
The bug is reproducible for python 2.7.3 and 3.2.2. Test case is attached.
Here inline simplified source for 2.7:
foo.c:
#include<stdio.h>
#include<Python.h>
PyMODINIT_FUNC initfoo(){
(void) Py_InitModule("foo",NULL);
printf("initfoo()\n");
}
PyMODINIT_FUNC initbar(void){
(void) Py_InitModule("bar",NULL);
printf("initbar()\n");
}
PyMODINIT_FUNC initbaz(void){
(void) Py_InitModule("baz",NULL);
printf("initbaz()\n");
}
test.py:
import sys,imp
# import foo using the normal machinery
sys.path.append('.')
import foo
# this is OK
print imp.load_dynamic('bar','foo.so')
# this imports *bar* again, but should import baz
print imp.load_dynamic('baz','foo.so')
# this imports *bar* again, although the module is not defined at all
print imp.load_dynamic('nonsense','foo.so')
Compiled with
gcc -shared -fPIC foo.c -o foo.so `pkg-config python --cflags --libs`
I get when running "python test.py" output:
initfoo()
initbar()
<module 'bar' from 'foo.so'>
<module 'bar' from 'foo.so'>
<module 'bar' from 'foo.so'>
The module 'bar' is imported 3 times, although the 2nd import should import
*baz* and the third import should fail ("nonsense" module does not exist).
----------
components: Library (Lib)
files: load_dynamic-test.zip
messages: 172632
nosy: eudoxos
priority: normal
severity: normal
status: open
title: imp.load_dynamic imports wrong module when called several times on a
multi-module .so
type: behavior
versions: Python 2.7
Added file: http://bugs.python.org/file27527/load_dynamic-test.zip
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16194>
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