cpython / Python / importdl.c

/* Support for dynamic loading of extension modules */

#include "Python.h"

/* ./configure sets HAVE_DYNAMIC_LOADING if dynamic loading of modules is
   supported on this platform. configure will then compile and link in one
   of the dynload_*.c files, as appropriate. We will call a function in
   those modules to get a function pointer to the module's init function.

#include "importdl.h"

extern dl_funcptr _PyImport_GetDynLoadFunc(const char *name,
					   const char *shortname,
					   const char *pathname, FILE *fp);

PyObject *
_PyImport_LoadDynamicModule(char *name, char *pathname, FILE *fp)
	PyObject *m, *d, *s;
	char *lastdot, *shortname, *packagecontext, *oldcontext;
	dl_funcptr p;

	if ((m = _PyImport_FindExtension(name, pathname)) != NULL) {
		return m;
	lastdot = strrchr(name, '.');
	if (lastdot == NULL) {
		packagecontext = NULL;
		shortname = name;
	else {
		packagecontext = name;
		shortname = lastdot+1;

	p = _PyImport_GetDynLoadFunc(name, shortname, pathname, fp);
	if (PyErr_Occurred())
		return NULL;
	if (p == NULL) {
		   "dynamic module does not define init function (init%.200s)",
		return NULL;
        oldcontext = _Py_PackageContext;
	_Py_PackageContext = packagecontext;
	_Py_PackageContext = oldcontext;
	if (PyErr_Occurred())
		return NULL;
	if (_PyImport_FixupExtension(name, pathname) == NULL)
		return NULL;

	m = PyDict_GetItemString(PyImport_GetModuleDict(), name);
	if (m == NULL) {
				"dynamic module not initialized properly");
		return NULL;
	/* Remember the filename as the __file__ attribute */
	d = PyModule_GetDict(m);
	s = PyString_FromString(pathname);
	if (s == NULL || PyDict_SetItemString(d, "__file__", s) != 0)
		PyErr_Clear(); /* Not important enough to report */
	if (Py_VerboseFlag)
			"import %s # dynamically loaded from %s\n",
			name, pathname);
	return m;

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