libreoffice/pyuno/source/module/pyuno_dlopenwrapper.c

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/* make Python.h go first as a hack to work around _POSIX_C_SOURCE redefinition
   warnings: */
#include "Python.h"

#include "sal/config.h"

#include <stdlib.h>
#include <string.h>

#if defined LINUX && !defined __USE_GNU
#define __USE_GNU
#endif
#include <dlfcn.h>

#include "rtl/string.h"

/* A wrapper around libpyuno.so, making sure the latter is loaded RTLD_GLOBAL
   so that C++ exception handling works with old GCC versions (that determine
   RTTI identity by comparing string addresses rather than string content).
*/

static void * load(void * address, char const * symbol) {
    Dl_info dl_info;
    char * slash;
    size_t len;
    char * libname;
    void * h;
    void * func;
    if (dladdr(address, &dl_info) == 0) {
        abort();
    }
    slash = strrchr(dl_info.dli_fname, '/');
    if (slash == NULL) {
        abort();
    }
    len = slash - dl_info.dli_fname + 1;
    libname = malloc(
        len + RTL_CONSTASCII_LENGTH(SAL_DLLPREFIX "pyuno" SAL_DLLEXTENSION)
        + 1);
    if (libname == 0) {
        abort();
    }
    strncpy(libname, dl_info.dli_fname, len);
    strcpy(libname + len, SAL_DLLPREFIX "pyuno" SAL_DLLEXTENSION);
    h = dlopen(libname, RTLD_NOW | RTLD_GLOBAL);
    free(libname);
    if (h == NULL) {
        abort();
    }
    func = dlsym(h, symbol);
    if (func == NULL) {
        abort();
    }
    return func;
}

#if PY_MAJOR_VERSION >= 3

PyObject * PyInit_pyuno(void) {
    return
        ((PyObject * (*)(void)) load((void *) &PyInit_pyuno, "PyInit_pyuno"))();
}

#else

void initpyuno(void) {
    ((void (*)(void)) load((void *) &initpyuno, "initpyuno"))();
}

#endif

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