1 
2 /* Support for dynamic loading of extension modules */
3 
4 #include "Python.h"
5 
6 /* ./configure sets HAVE_DYNAMIC_LOADING if dynamic loading of modules is
7    supported on this platform. configure will then compile and link in one
8    of the dynload_*.c files, as appropriate. We will call a function in
9    those modules to get a function pointer to the module's init function.
10 */
11 #ifdef HAVE_DYNAMIC_LOADING
12 
13 #include "importdl.h"
14 
15 extern dl_funcptr _PyImport_GetDynLoadFunc(const char *name,
16                                            const char *shortname,
17                                            const char *pathname, FILE *fp);
18 
19 
20 
21 PyObject *
22 _PyImport_LoadDynamicModule(char *name, char *pathname, FILE *fp)
23 {
24     PyObject *m;
25     char *lastdot, *shortname, *packagecontext, *oldcontext;
26     dl_funcptr p;
27 
28     if ((m = _PyImport_FindExtension(name, pathname)) != NULL) {
29         Py_INCREF(m);
30         return m;
31     }
32     lastdot = strrchr(name, '.');
33     if (lastdot == NULL) {
34         packagecontext = NULL;
35         shortname = name;
36     }
37     else {
38         packagecontext = name;
39         shortname = lastdot+1;
40     }
41 
42     p = _PyImport_GetDynLoadFunc(name, shortname, pathname, fp);
43     if (PyErr_Occurred())
44         return NULL;
45     if (p == NULL) {
46         PyErr_Format(PyExc_ImportError,
47            "dynamic module does not define init function (init%.200s)",
48                      shortname);
49         return NULL;
50     }
51     oldcontext = _Py_PackageContext;
52     _Py_PackageContext = packagecontext;
53     (*p)();
54     _Py_PackageContext = oldcontext;
55     if (PyErr_Occurred())
56         return NULL;
57 
58     m = PyDict_GetItemString(PyImport_GetModuleDict(), name);
59     if (m == NULL) {
60         PyErr_SetString(PyExc_SystemError,
61                         "dynamic module not initialized properly");
62         return NULL;
63     }
64     /* Remember the filename as the __file__ attribute */
65     if (PyModule_AddStringConstant(m, "__file__", pathname) < 0)
66         PyErr_Clear(); /* Not important enough to report */
67 
68     if (_PyImport_FixupExtension(name, pathname) == NULL)
69         return NULL;
70     if (Py_VerboseFlag)
71         PySys_WriteStderr(
72             "import %s # dynamically loaded from %s\n",
73             name, pathname);
74     Py_INCREF(m);
75     return m;
76 }
77 
78 #endif /* HAVE_DYNAMIC_LOADING */
79