cpython-withatomic / 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;
    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;

    m = PyDict_GetItemString(PyImport_GetModuleDict(), name);
    if (m == NULL) {
                        "dynamic module not initialized properly");
        return NULL;
    /* Remember the filename as the __file__ attribute */
    if (PyModule_AddStringConstant(m, "__file__", pathname) < 0)
        PyErr_Clear(); /* Not important enough to report */

    if (_PyImport_FixupExtension(name, pathname) == NULL)
        return NULL;
    if (Py_VerboseFlag)
            "import %s # dynamically loaded from %s\n",
            name, pathname);
    return m;

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