pythonnet/src/monoclr/pynetinit.c at python3.9 · sdpython/pythonnet · GitHub

This repository was archived by the owner on Jul 22, 2023. It is now read-only.

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#include "pynetclr.h"

#include "stdlib.h"

#ifndef _WIN32

#include "dirent.h"

#include "dlfcn.h"

#include "libgen.h"

#include "alloca.h"

#endif

// initialize Mono and PythonNet

PyNet_Args *PyNet_Init(int ext)

{

PyNet_Args *pn_args;

pn_args = (PyNet_Args *)malloc(sizeof(PyNet_Args));

pn_args->pr_file = PR_ASSEMBLY;

pn_args->error = NULL;

pn_args->shutdown = NULL;

pn_args->module = NULL;

#ifdef __linux__

// Force preload libmono-2.0 as global. Without this, on some systems

// symbols from libmono are not found by libmononative (which implements

// some of the System.* namespaces). Since the only happened on Linux so

// far, we hardcode the library name, load the symbols into the global

// namespace and leak the handle.

dlopen("libmono-2.0.so", RTLD_LAZY | RTLD_GLOBAL);

#endif

if (ext == 0)

{

pn_args->init_name = "Python.Runtime:Initialize()";

}

else

{

pn_args->init_name = "Python.Runtime:InitExt()";

}

pn_args->shutdown_name = "Python.Runtime:Shutdown()";

pn_args->domain = mono_jit_init_version(MONO_DOMAIN, MONO_VERSION);

mono_domain_set_config(pn_args->domain, ".", "Python.Runtime.dll.config");

* Load the default Mono configuration file, this is needed

* if you are planning on using the dllmaps defined on the

* system configuration

mono_config_parse(NULL);

/* I can't use this call to run the main_thread_handler. The function

* runs it in another thread but *this* thread holds the Python

* import lock -> DEAD LOCK.

* mono_runtime_exec_managed_code(pn_args->domain, main_thread_handler,

* pn_args);

main_thread_handler(pn_args);

if (pn_args->error != NULL)

{

PyErr_SetString(PyExc_ImportError, pn_args->error);

}

return pn_args;

}

// Shuts down PythonNet and cleans up Mono

void PyNet_Finalize(PyNet_Args *pn_args)

{

MonoObject *exception = NULL;

if (pn_args->shutdown)

{

mono_runtime_invoke(pn_args->shutdown, NULL, NULL, &exception);

if (exception)

{

pn_args->error = PyNet_ExceptionToString(exception);

}

pn_args->shutdown = NULL;

}

if (pn_args->domain)

{

mono_jit_cleanup(pn_args->domain);

pn_args->domain = NULL;

}

free(pn_args);

}

MonoMethod *getMethodFromClass(MonoClass *cls, char *name)

{

MonoMethodDesc *mdesc;

MonoMethod *method;

mdesc = mono_method_desc_new(name, 1);

method = mono_method_desc_search_in_class(mdesc, cls);

mono_method_desc_free(mdesc);

return method;

}

void main_thread_handler(PyNet_Args *user_data)

{

PyNet_Args *pn_args = user_data;

MonoMethod *init;

MonoImage *pr_image;

MonoClass *pythonengine;

MonoObject *exception = NULL;

MonoObject *init_result;

#ifndef _WIN32

// Get the filename of the python shared object and set

// LD_LIBRARY_PATH so Mono can find it.

Dl_info dlinfo = {0};

if (0 != dladdr(&Py_Initialize, &dlinfo))

{

char *fname = alloca(strlen(dlinfo.dli_fname) + 1);

strcpy(fname, dlinfo.dli_fname);

char *py_libdir = dirname(fname);

char *ld_library_path = getenv("LD_LIBRARY_PATH");

if (NULL == ld_library_path)

{

setenv("LD_LIBRARY_PATH", py_libdir, 1);

}

else

{

char *new_ld_library_path = alloca(strlen(py_libdir)

+ strlen(ld_library_path)

+ 2);

strcpy(new_ld_library_path, py_libdir);

strcat(new_ld_library_path, ":");

strcat(new_ld_library_path, ld_library_path);

setenv("LD_LIBRARY_PATH", new_ld_library_path, 1);

}

//get python path system variable

PyObject *syspath = PySys_GetObject("path");

char *runtime_full_path = (char*) malloc(1024);

const char *slash = "/";

int found = 0;

int ii = 0;

for (ii = 0; ii < PyList_Size(syspath); ++ii)

{

#if PY_MAJOR_VERSION >= 3

Py_ssize_t wlen;

wchar_t *wstr = PyUnicode_AsWideCharString(PyList_GetItem(syspath, ii), &wlen);

char *pydir = (char*)malloc(wlen + 1);

size_t mblen = wcstombs(pydir, wstr, wlen + 1);

if (mblen > wlen)

pydir[wlen] = '\0';

PyMem_Free(wstr);

#else

const char *pydir = PyString_AsString(PyList_GetItem(syspath, ii));

#endif

char *curdir = (char*) malloc(1024);

strncpy(curdir, strlen(pydir) > 0 ? pydir : ".", 1024);

strncat(curdir, slash, 1024);

#if PY_MAJOR_VERSION >= 3

free(pydir);

#endif

//look in this directory for the pn_args->pr_file

DIR *dirp = opendir(curdir);

if (dirp != NULL)

{

struct dirent *dp;

while ((dp = readdir(dirp)) != NULL)

{

if (strcmp(dp->d_name, pn_args->pr_file) == 0)

{

strcpy(runtime_full_path, curdir);

strcat(runtime_full_path, pn_args->pr_file);

found = 1;

break;

}

closedir(dirp);

}

free(curdir);

if (found)

{

pn_args->pr_file = runtime_full_path;

break;

}

if (!found)

{

fprintf(stderr, "Could not find assembly %s. \n", pn_args->pr_file);

return;

}

#endif

pn_args->pr_assm = mono_domain_assembly_open(pn_args->domain, pn_args->pr_file);

if (!pn_args->pr_assm)

{

pn_args->error = "Unable to load assembly";

return;

}

#ifndef _WIN32

free(runtime_full_path);

#endif

pr_image = mono_assembly_get_image(pn_args->pr_assm);

if (!pr_image)

{

pn_args->error = "Unable to get image";

return;

}

pythonengine = mono_class_from_name(pr_image, "Python.Runtime", "PythonEngine");

if (!pythonengine)

{

pn_args->error = "Unable to load class PythonEngine from Python.Runtime";

return;

}

init = getMethodFromClass(pythonengine, pn_args->init_name);

if (!init)

{

pn_args->error = "Unable to fetch Init method from PythonEngine";

return;

}

pn_args->shutdown = getMethodFromClass(pythonengine, pn_args->shutdown_name);

if (!pn_args->shutdown)

{

pn_args->error = "Unable to fetch shutdown method from PythonEngine";

return;

}

init_result = mono_runtime_invoke(init, NULL, NULL, &exception);

if (exception)

{

pn_args->error = PyNet_ExceptionToString(exception);

return;

}

#if PY_MAJOR_VERSION >= 3

if (NULL != init_result)

pn_args->module = *(PyObject**)mono_object_unbox(init_result);

#endif

}

// Get string from a Mono exception

char *PyNet_ExceptionToString(MonoObject *e)

{

MonoMethodDesc *mdesc = mono_method_desc_new(":ToString()", 0 /*FALSE*/);

MonoMethod *mmethod = mono_method_desc_search_in_class(mdesc, mono_get_object_class());

mono_method_desc_free(mdesc);

mmethod = mono_object_get_virtual_method(e, mmethod);

MonoString *monoString = (MonoString*) mono_runtime_invoke(mmethod, e, NULL, NULL);

mono_runtime_invoke(mmethod, e, NULL, NULL);

return mono_string_to_utf8(monoString);

}

pythonnet/src/monoclr/pynetinit.c at python3.9 · sdpython/pythonnet · GitHub

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