LCOV - code coverage report
Current view: top level - Python - dynload_shlib.c (source / functions) Hit Total Coverage
Test: CPython lcov report Lines: 25 34 73.5 %
Date: 2022-07-07 18:19:46 Functions: 1 1 100.0 %

          Line data    Source code
       1             : 
       2             : /* Support for dynamic loading of extension modules */
       3             : 
       4             : #include "Python.h"
       5             : #include "pycore_interp.h"    // _PyInterpreterState.dlopenflags
       6             : #include "pycore_pystate.h"   // _PyInterpreterState_GET()
       7             : #include "importdl.h"
       8             : 
       9             : #include <sys/types.h>
      10             : #include <sys/stat.h>
      11             : 
      12             : #if defined(__NetBSD__)
      13             : #include <sys/param.h>
      14             : #if (NetBSD < 199712)
      15             : #include <nlist.h>
      16             : #include <link.h>
      17             : #define dlerror() "error in dynamic linking"
      18             : #endif
      19             : #endif /* NetBSD */
      20             : 
      21             : #ifdef HAVE_DLFCN_H
      22             : #include <dlfcn.h>
      23             : #endif
      24             : 
      25             : #if (defined(__OpenBSD__) || defined(__NetBSD__)) && !defined(__ELF__)
      26             : #define LEAD_UNDERSCORE "_"
      27             : #else
      28             : #define LEAD_UNDERSCORE ""
      29             : #endif
      30             : 
      31             : /* The .so extension module ABI tag, supplied by the Makefile via
      32             :    Makefile.pre.in and configure.  This is used to discriminate between
      33             :    incompatible .so files so that extensions for different Python builds can
      34             :    live in the same directory.  E.g. foomodule.cpython-32.so
      35             : */
      36             : 
      37             : const char *_PyImport_DynLoadFiletab[] = {
      38             : #ifdef __CYGWIN__
      39             :     ".dll",
      40             : #else  /* !__CYGWIN__ */
      41             :     "." SOABI ".so",
      42             : #ifdef ALT_SOABI
      43             :     "." ALT_SOABI ".so",
      44             : #endif
      45             :     ".abi" PYTHON_ABI_STRING ".so",
      46             :     ".so",
      47             : #endif  /* __CYGWIN__ */
      48             :     NULL,
      49             : };
      50             : 
      51             : 
      52             : dl_funcptr
      53       29403 : _PyImport_FindSharedFuncptr(const char *prefix,
      54             :                             const char *shortname,
      55             :                             const char *pathname, FILE *fp)
      56             : {
      57             :     dl_funcptr p;
      58             :     void *handle;
      59             :     char funcname[258];
      60             :     char pathbuf[260];
      61       29403 :     int dlopenflags=0;
      62             : 
      63       29403 :     if (strchr(pathname, '/') == NULL) {
      64             :         /* Prefix bare filename with "./" */
      65           1 :         PyOS_snprintf(pathbuf, sizeof(pathbuf), "./%-.255s", pathname);
      66           1 :         pathname = pathbuf;
      67             :     }
      68             : 
      69       29403 :     PyOS_snprintf(funcname, sizeof(funcname),
      70             :                   LEAD_UNDERSCORE "%.20s_%.200s", prefix, shortname);
      71             : 
      72       29403 :     if (fp != NULL) {
      73             :         struct _Py_stat_struct status;
      74           0 :         if (_Py_fstat(fileno(fp), &status) == -1)
      75           0 :             return NULL;
      76             :     }
      77             : 
      78       29403 :     dlopenflags = _PyInterpreterState_GET()->dlopenflags;
      79             : 
      80       29403 :     handle = dlopen(pathname, dlopenflags);
      81             : 
      82       29403 :     if (handle == NULL) {
      83             :         PyObject *mod_name;
      84             :         PyObject *path;
      85             :         PyObject *error_ob;
      86          47 :         const char *error = dlerror();
      87          47 :         if (error == NULL)
      88           0 :             error = "unknown dlopen() error";
      89          47 :         error_ob = PyUnicode_DecodeLocale(error, "surrogateescape");
      90          47 :         if (error_ob == NULL)
      91           0 :             return NULL;
      92          47 :         mod_name = PyUnicode_FromString(shortname);
      93          47 :         if (mod_name == NULL) {
      94           0 :             Py_DECREF(error_ob);
      95           0 :             return NULL;
      96             :         }
      97          47 :         path = PyUnicode_DecodeFSDefault(pathname);
      98          47 :         if (path == NULL) {
      99           0 :             Py_DECREF(error_ob);
     100           0 :             Py_DECREF(mod_name);
     101           0 :             return NULL;
     102             :         }
     103          47 :         PyErr_SetImportError(error_ob, mod_name, path);
     104          47 :         Py_DECREF(error_ob);
     105          47 :         Py_DECREF(mod_name);
     106          47 :         Py_DECREF(path);
     107          47 :         return NULL;
     108             :     }
     109       29356 :     p = (dl_funcptr) dlsym(handle, funcname);
     110       29356 :     return p;
     111             : }

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