Mercurial > cpython-lru_cache-weakref

annotate Python/importdl.c @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 19611d101d23
children fd25030223b0 19319e70fc3e
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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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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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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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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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57
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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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78 #endif /* HAVE_DYNAMIC_LOADING */