AppPkg/Applications/Python/Python-2.7.10/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
  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 */