Hi,
If I use dlopen() to open a shared library that I've written, and that
shared library tries to use the Python/C API, then it fails. I've
reduced the problem to the test case below. The error is:
ImportError: /usr/lib/python2.5/lib-dynload/time.so: undefined symbol:
PyExc_ValueError
It appears that time.so tries to resolve PyExc_ValueError out of my
program instead of libpython.so.
I'm using Ubuntu 8.04, so that's Python 2.5.2.
How do I go about getting this to work? Is this a bug in lib-dynload, or
am I using the wrong linker flags?
Would this be better asked in python-dev?
Thanks,
Robie
/* Start of mylib.c */
/* Compile with: gcc -I/usr/include/python2.5 -fno-strict-aliasing -g -fwrapv
-Wall -Wstrict-prototypes -L/usr/lib/python2.5/config -fPIC -shared
-l:libpython2.5.so.1 -Xlinker -export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions
-o mylib.so mylib.c */
#include Python.h
#include stdio.h
int init(void) {
PyObject *module;
module = PyImport_ImportModule(time);
if(!module) {
fprintf(stderr, python module load failed\n);
PyErr_Print();
return -1;
}
Py_DECREF(module);
return 0;
}
void init_module(void) {
fprintf(stderr, python initalizing\n);
Py_Initialize();
fprintf(stderr, python initialized\n);
}
/* vim: set ts=8 sts=4 sw=4 ai : */
/* End of mylib.c */
/* Start of myprog.c */
/* Compile with: gcc -o myprog -ldl myprog.c */
#include dlfcn.h
#include stdio.h
int main(int argc, char **argv) {
void *lib;
int (*init)(void);
void (*init_module)(void);
char *error;
lib = dlopen(./mylib.so, RTLD_LAZY);
if(!lib) {
fprintf(stderr, %s\n, dlerror());
return 1;
}
dlerror();
*(void **) (init_module) = dlsym(lib, init_module);
if((error=dlerror()) != NULL) {
fprintf(stderr, %s\n, error);
return 1;
}
(*init_module)();
*(void **) (init) = dlsym(lib, init);
if((error=dlerror()) != NULL) {
fprintf(stderr, %s\n, error);
return 1;
}
(*init)();
dlclose(lib);
return 0;
}
/* vim: set ts=8 sw=4 sts=4 ai : */
/* End of myprog.c */
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