Mercurial > cpython-lru_cache-weakref

annotate Python/importdl.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents fd25030223b0
children
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include "Python.h"
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5
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6 /* ./configure sets HAVE_DYNAMIC_LOADING if dynamic loading of modules is
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7 supported on this platform. configure will then compile and link in one
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8 of the dynload_*.c files, as appropriate. We will call a function in
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9 those modules to get a function pointer to the module's init function.
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10 */
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11 #ifdef HAVE_DYNAMIC_LOADING
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12
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13 #include "importdl.h"
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15 extern dl_funcptr _PyImport_GetDynLoadFunc(const char *name,
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16 const char *shortname,
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17 const char *pathname, FILE *fp);
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18
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21 PyObject *
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22 _PyImport_LoadDynamicModule(char *name, char *pathname, FILE *fp)
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23 {
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24 PyObject *m;
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25 char *lastdot, *shortname, *packagecontext, *oldcontext;
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26 dl_funcptr p;
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27
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28 if ((m = _PyImport_FindExtension(name, pathname)) != NULL) {
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29 Py_INCREF(m);
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30 return m;
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31 }
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32 lastdot = strrchr(name, '.');
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33 if (lastdot == NULL) {
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34 packagecontext = NULL;
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35 shortname = name;
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36 }
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37 else {
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38 packagecontext = name;
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39 shortname = lastdot+1;
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40 }
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41
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42 p = _PyImport_GetDynLoadFunc(name, shortname, pathname, fp);
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43 if (PyErr_Occurred())
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44 return NULL;
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45 if (p == NULL) {
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46 PyErr_Format(PyExc_ImportError,
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47 "dynamic module does not define init function (init%.200s)",
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48 shortname);
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49 return NULL;
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50 }
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51 oldcontext = _Py_PackageContext;
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52 _Py_PackageContext = packagecontext;
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53 (*p)();
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54 _Py_PackageContext = oldcontext;
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55 if (PyErr_Occurred())
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56 return NULL;
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58 m = PyDict_GetItemString(PyImport_GetModuleDict(), name);
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59 if (m == NULL) {
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60 PyErr_SetString(PyExc_SystemError,
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61 "dynamic module not initialized properly");
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62 return NULL;
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63 }
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64 /* Remember the filename as the __file__ attribute */
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65 if (PyModule_AddStringConstant(m, "__file__", pathname) < 0)
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66 PyErr_Clear(); /* Not important enough to report */
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67
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68 if (_PyImport_FixupExtension(name, pathname) == NULL)
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69 return NULL;
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70 if (Py_VerboseFlag)
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71 PySys_WriteStderr(
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72 "import %s # dynamically loaded from %s\n",
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73 name, pathname);
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74 Py_INCREF(m);
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75 return m;
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76 }
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77
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78 #endif /* HAVE_DYNAMIC_LOADING */