/Python/importdl.c

 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
15extern dl_funcptr _PyImport_GetDynLoadFunc(const char *name,
16					   const char *shortname,
17					   const char *pathname, FILE *fp);
18
19
20
21PyObject *
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 */