Python/importdl.c

   1 /***********************************************************
   2 Copyright (c) 2000, BeOpen.com.
   3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
   4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
   5 All rights reserved.
   6
   7 See the file "Misc/COPYRIGHT" for information on usage and
   8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
   9 ******************************************************************/
  10
  11 /* Support for dynamic loading of extension modules */
  12
  13 #include "Python.h"
  14
  15 /* ./configure sets HAVE_DYNAMIC_LOADING if dynamic loading of modules is
  16    supported on this platform. configure will then compile and link in one
  17    of the dynload_*.c files, as appropriate. We will call a function in
  18    those modules to get a function pointer to the module's init function.
  19 */
  20 #ifdef HAVE_DYNAMIC_LOADING
  21
  22 #include "importdl.h"
  23
  24 extern dl_funcptr _PyImport_GetDynLoadFunc(const char *name,
  25                                            const char *shortname,
  26                                            const char *pathname, FILE *fp);
  27
  28
  29
  30 PyObject *
  31 _PyImport_LoadDynamicModule(char *name, char *pathname, FILE *fp)
  32 {
  33         PyObject *m, *d, *s;
  34         char *lastdot, *shortname, *packagecontext;
  35         dl_funcptr p;
  36
  37         if ((m = _PyImport_FindExtension(name, pathname)) != NULL) {
  38                 Py_INCREF(m);
  39                 return m;
  40         }
  41         lastdot = strrchr(name, '.');
  42         if (lastdot == NULL) {
  43                 packagecontext = NULL;
  44                 shortname = name;
  45         }
  46         else {
  47                 packagecontext = name;
  48                 shortname = lastdot+1;
  49         }
  50
  51         p = _PyImport_GetDynLoadFunc(name, shortname, pathname, fp);
  52         if (PyErr_Occurred())
  53                 return NULL;
  54         if (p == NULL) {
  55                 PyErr_Format(PyExc_ImportError,
  56                    "dynamic module does not define init function (init%.200s)",
  57                              shortname);
  58                 return NULL;
  59         }
  60         _Py_PackageContext = packagecontext;
  61         (*p)();
  62         _Py_PackageContext = NULL;
  63         if (PyErr_Occurred())
  64                 return NULL;
  65         if (_PyImport_FixupExtension(name, pathname) == NULL)
  66                 return NULL;
  67
  68         m = PyDict_GetItemString(PyImport_GetModuleDict(), name);
  69         if (m == NULL) {
  70                 PyErr_SetString(PyExc_SystemError,
  71                                 "dynamic module not initialized properly");
  72                 return NULL;
  73         }
  74         /* Remember the filename as the __file__ attribute */
  75         d = PyModule_GetDict(m);
  76         s = PyString_FromString(pathname);
  77         if (s == NULL || PyDict_SetItemString(d, "__file__", s) != 0)
  78                 PyErr_Clear(); /* Not important enough to report */
  79         Py_XDECREF(s);
  80         if (Py_VerboseFlag)
  81                 PySys_WriteStderr(
  82                         "import %s # dynamically loaded from %s\n",
  83                         name, pathname);
  84         Py_INCREF(m);
  85         return m;
  86 }
  87
  88 #endif /* HAVE_DYNAMIC_LOADING */