pyuno/source/module/pyuno_dlopenwrapper.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 /* make Python.h go first as a hack to work around _POSIX_C_SOURCE redefinition
  21    warnings: */
  22 #include <Python.h>
  23
  24 #include <sal/config.h>
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #if defined LINUX && !defined __USE_GNU
  30 #define __USE_GNU
  31 #endif
  32 #include <dlfcn.h>
  33
  34 #include <rtl/string.h>
  35
  36 /* A wrapper around libpyuno.so, making sure the latter is loaded RTLD_GLOBAL
  37    so that C++ exception handling works with old GCC versions (that determine
  38    RTTI identity by comparing string addresses rather than string content).
  39 */
  40
  41 static void * load(void const * address, char const * symbol) {
  42     Dl_info dl_info;
  43     char * slash;
  44     size_t len;
  45     char * libname;
  46     void * h;
  47     void * func;
  48     if (dladdr(address, &dl_info) == 0) {
  49         abort();
  50     }
  51     slash = strrchr(dl_info.dli_fname, '/');
  52     if (slash == NULL) {
  53         abort();
  54     }
  55     len = slash - dl_info.dli_fname + 1;
  56     libname = malloc(
  57         len + RTL_CONSTASCII_LENGTH(SAL_DLLPREFIX "pyuno" SAL_DLLEXTENSION)
  58         + 1);
  59     if (libname == NULL) {
  60         abort();
  61     }
  62     strncpy(libname, dl_info.dli_fname, len);
  63     strcpy(libname + len, SAL_DLLPREFIX "pyuno" SAL_DLLEXTENSION);
  64     h = dlopen(libname, RTLD_LAZY | RTLD_GLOBAL);
  65     free(libname);
  66     if (h == NULL) {
  67         fprintf(stderr, "failed to load pyuno: '%s'\n", dlerror());
  68         abort();
  69     }
  70     func = dlsym(h, symbol);
  71     if (func == NULL) {
  72         dlclose(h);
  73         abort();
  74     }
  75     // coverity[leaked_storage] - this is on purpose
  76     return func;
  77 }
  78
  79 SAL_DLLPUBLIC_EXPORT PyObject * PyInit_pyuno(void) {
  80     return
  81         ((PyObject * (*)(void)) load((void *) &PyInit_pyuno, "PyInit_pyuno"))();
  82 }
  83
  84 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */