1  
       2  /* Support for dynamic loading of extension modules */
       3  
       4  #include "dl.h"
       5  #include <errno.h>
       6  
       7  #include "Python.h"
       8  #include "importdl.h"
       9  
      10  #if defined(__hp9000s300)
      11  #define FUNCNAME_PATTERN "_%.20s_%.200s"
      12  #else
      13  #define FUNCNAME_PATTERN "%.20s_%.200s"
      14  #endif
      15  
      16  const char *_PyImport_DynLoadFiletab[] = {SHLIB_EXT, ".sl", NULL};
      17  
      18  dl_funcptr _PyImport_FindSharedFuncptr(const char *prefix,
      19                                         const char *shortname,
      20                                         const char *pathname, FILE *fp)
      21  {
      22      int flags = BIND_FIRST | BIND_DEFERRED;
      23      int verbose = _Py_GetConfig()->verbose;
      24      if (verbose) {
      25          flags = BIND_FIRST | BIND_IMMEDIATE |
      26              BIND_NONFATAL | BIND_VERBOSE;
      27          printf("shl_load %s\n",pathname);
      28      }
      29  
      30      shl_t lib = shl_load(pathname, flags, 0);
      31      /* XXX Chuck Blake once wrote that 0 should be BIND_NOSTART? */
      32      if (lib == NULL) {
      33          if (verbose) {
      34              perror(pathname);
      35          }
      36          char buf[256];
      37          PyOS_snprintf(buf, sizeof(buf), "Failed to load %.200s",
      38                        pathname);
      39          PyObject *buf_ob = PyUnicode_DecodeFSDefault(buf);
      40          if (buf_ob == NULL)
      41              return NULL;
      42          PyObject *shortname_ob = PyUnicode_FromString(shortname);
      43          if (shortname_ob == NULL) {
      44              Py_DECREF(buf_ob);
      45              return NULL;
      46          }
      47          PyObject *pathname_ob = PyUnicode_DecodeFSDefault(pathname);
      48          if (pathname_ob == NULL) {
      49              Py_DECREF(buf_ob);
      50              Py_DECREF(shortname_ob);
      51              return NULL;
      52          }
      53          PyErr_SetImportError(buf_ob, shortname_ob, pathname_ob);
      54          Py_DECREF(buf_ob);
      55          Py_DECREF(shortname_ob);
      56          Py_DECREF(pathname_ob);
      57          return NULL;
      58      }
      59  
      60      char funcname[258];
      61      PyOS_snprintf(funcname, sizeof(funcname), FUNCNAME_PATTERN,
      62                    prefix, shortname);
      63      if (verbose) {
      64          printf("shl_findsym %s\n", funcname);
      65      }
      66  
      67      dl_funcptr p;
      68      if (shl_findsym(&lib, funcname, TYPE_UNDEFINED, (void *) &p) == -1) {
      69          shl_unload(lib);
      70          p = NULL;
      71      }
      72      if (p == NULL && verbose) {
      73          perror(funcname);
      74      }
      75      return p;
      76  }