_testembed.c

#ifndef Py_BUILD_CORE_MODULE
#  define Py_BUILD_CORE_MODULE
#endif

/* Always enable assertion (even in release mode) */
#undef NDEBUG

#include <Python.h>
#include "pycore_initconfig.h"    // _PyConfig_InitCompatConfig()
#include "pycore_runtime.h"       // _PyRuntime
#include <Python.h>
#include <inttypes.h>
#include <stdio.h>
#include <wchar.h>

/*********************************************************
 * Embedded interpreter tests that need a custom exe
 *
 * Executed via 'EmbeddingTests' in Lib/test/test_capi.py
 *********************************************************/

/* Use path starting with "./" avoids a search along the PATH */
#define PROGRAM_NAME L"./_testembed"

#define INIT_LOOPS 16


static void _testembed_Py_Initialize(void)
{
    Py_SetProgramName(PROGRAM_NAME);
    Py_Initialize();
}


/*****************************************************
 * Test repeated initialisation and subinterpreters
 *****************************************************/

static void print_subinterp(void)
{
    /* Output information about the interpreter in the format
       expected in Lib/test/test_capi.py (test_subinterps). */
    PyThreadState *ts = PyThreadState_Get();
    PyInterpreterState *interp = ts->interp;
    int64_t id = PyInterpreterState_GetID(interp);
    printf("interp %" PRId64 " <0x%" PRIXPTR ">, thread state <0x%" PRIXPTR ">: ",
            id, (uintptr_t)interp, (uintptr_t)ts);
    fflush(stdout);
    PyRun_SimpleString(
        "import sys;"
        "print('id(modules) =', id(sys.modules));"
        "sys.stdout.flush()"
    );
}

static int test_repeated_init_and_subinterpreters(void)
{
    PyThreadState *mainstate, *substate;
    PyGILState_STATE gilstate;

    for (int i=1; i <= INIT_LOOPS; i++) {
        printf("--- Pass %d ---\n", i);
        _testembed_Py_Initialize();
        mainstate = PyThreadState_Get();

        PyEval_ReleaseThread(mainstate);

        gilstate = PyGILState_Ensure();
        print_subinterp();
        PyThreadState_Swap(NULL);

        for (int j=0; j<3; j++) {
            substate = Py_NewInterpreter();
            print_subinterp();
            Py_EndInterpreter(substate);
        }

        PyThreadState_Swap(mainstate);
        print_subinterp();
        PyGILState_Release(gilstate);

        PyEval_RestoreThread(mainstate);
        Py_Finalize();
    }
    return 0;
}

#define EMBEDDED_EXT_NAME "embedded_ext"

static PyModuleDef embedded_ext = {
    PyModuleDef_HEAD_INIT,
    .m_name = EMBEDDED_EXT_NAME,
    .m_size = 0,
};

static PyObject*
PyInit_embedded_ext(void)
{
    return PyModule_Create(&embedded_ext);
}

/*****************************************************
 * Test forcing a particular IO encoding
 *****************************************************/

static void check_stdio_details(const char *encoding, const char * errors)
{
    /* Output info for the test case to check */
    if (encoding) {
        printf("Expected encoding: %s\n", encoding);
    } else {
        printf("Expected encoding: default\n");
    }
    if (errors) {
        printf("Expected errors: %s\n", errors);
    } else {
        printf("Expected errors: default\n");
    }
    fflush(stdout);
    /* Force the given IO encoding */
    Py_SetStandardStreamEncoding(encoding, errors);
    _testembed_Py_Initialize();
    PyRun_SimpleString(
        "import sys;"
        "print('stdin: {0.encoding}:{0.errors}'.format(sys.stdin));"
        "print('stdout: {0.encoding}:{0.errors}'.format(sys.stdout));"
        "print('stderr: {0.encoding}:{0.errors}'.format(sys.stderr));"
        "sys.stdout.flush()"
    );
    Py_Finalize();
}

static int test_forced_io_encoding(void)
{
    /* Check various combinations */
    printf("--- Use defaults ---\n");
    check_stdio_details(NULL, NULL);
    printf("--- Set errors only ---\n");
    check_stdio_details(NULL, "ignore");
    printf("--- Set encoding only ---\n");
    check_stdio_details("iso8859-1", NULL);
    printf("--- Set encoding and errors ---\n");
    check_stdio_details("iso8859-1", "replace");

    /* Check calling after initialization fails */
    Py_Initialize();

    if (Py_SetStandardStreamEncoding(NULL, NULL) == 0) {
        printf("Unexpected success calling Py_SetStandardStreamEncoding");
    }
    Py_Finalize();
    return 0;
}

/*********************************************************
 * Test parts of the C-API that work before initialization
 *********************************************************/

/* The pre-initialization tests tend to break by segfaulting, so explicitly
 * flushed progress messages make the broken API easier to find when they fail.
 */
#define _Py_EMBED_PREINIT_CHECK(msg) \
    do {printf(msg); fflush(stdout);} while (0);

static int test_pre_initialization_api(void)
{
    /* the test doesn't support custom memory allocators */
    putenv("PYTHONMALLOC=");

    /* Leading "./" ensures getpath.c can still find the standard library */
    _Py_EMBED_PREINIT_CHECK("Checking Py_DecodeLocale\n");
    wchar_t *program = Py_DecodeLocale("./spam", NULL);
    if (program == NULL) {
        fprintf(stderr, "Fatal error: cannot decode program name\n");
        return 1;
    }
    _Py_EMBED_PREINIT_CHECK("Checking Py_SetProgramName\n");
    Py_SetProgramName(program);

    _Py_EMBED_PREINIT_CHECK("Initializing interpreter\n");
    Py_Initialize();
    _Py_EMBED_PREINIT_CHECK("Check sys module contents\n");
    PyRun_SimpleString("import sys; "
                       "print('sys.executable:', sys.executable)");
    _Py_EMBED_PREINIT_CHECK("Finalizing interpreter\n");
    Py_Finalize();

    _Py_EMBED_PREINIT_CHECK("Freeing memory allocated by Py_DecodeLocale\n");
    PyMem_RawFree(program);
    return 0;
}


/* bpo-33042: Ensure embedding apps can predefine sys module options */
static int test_pre_initialization_sys_options(void)
{
    /* We allocate a couple of the options dynamically, and then delete
     * them before calling Py_Initialize. This ensures the interpreter isn't
     * relying on the caller to keep the passed in strings alive.
     */
    const wchar_t *static_warnoption = L"once";
    const wchar_t *static_xoption = L"also_not_an_option=2";
    size_t warnoption_len = wcslen(static_warnoption);
    size_t xoption_len = wcslen(static_xoption);
    wchar_t *dynamic_once_warnoption = \
             (wchar_t *) calloc(warnoption_len+1, sizeof(wchar_t));
    wchar_t *dynamic_xoption = \
             (wchar_t *) calloc(xoption_len+1, sizeof(wchar_t));
    wcsncpy(dynamic_once_warnoption, static_warnoption, warnoption_len+1);
    wcsncpy(dynamic_xoption, static_xoption, xoption_len+1);

    _Py_EMBED_PREINIT_CHECK("Checking PySys_AddWarnOption\n");
    PySys_AddWarnOption(L"default");
    _Py_EMBED_PREINIT_CHECK("Checking PySys_ResetWarnOptions\n");
    PySys_ResetWarnOptions();
    _Py_EMBED_PREINIT_CHECK("Checking PySys_AddWarnOption linked list\n");
    PySys_AddWarnOption(dynamic_once_warnoption);
    PySys_AddWarnOption(L"module");
    PySys_AddWarnOption(L"default");
    _Py_EMBED_PREINIT_CHECK("Checking PySys_AddXOption\n");
    PySys_AddXOption(L"not_an_option=1");
    PySys_AddXOption(dynamic_xoption);

    /* Delete the dynamic options early */
    free(dynamic_once_warnoption);
    dynamic_once_warnoption = NULL;
    free(dynamic_xoption);
    dynamic_xoption = NULL;

    _Py_EMBED_PREINIT_CHECK("Initializing interpreter\n");
    _testembed_Py_Initialize();
    _Py_EMBED_PREINIT_CHECK("Check sys module contents\n");
    PyRun_SimpleString("import sys; "
                       "print('sys.warnoptions:', sys.warnoptions); "
                       "print('sys._xoptions:', sys._xoptions); "
                       "warnings = sys.modules['warnings']; "
                       "latest_filters = [f[0] for f in warnings.filters[:3]]; "
                       "print('warnings.filters[:3]:', latest_filters)");
    _Py_EMBED_PREINIT_CHECK("Finalizing interpreter\n");
    Py_Finalize();

    return 0;
}


/* bpo-20891: Avoid race condition when initialising the GIL */
static void bpo20891_thread(void *lockp)
{
    PyThread_type_lock lock = *((PyThread_type_lock*)lockp);

    PyGILState_STATE state = PyGILState_Ensure();
    if (!PyGILState_Check()) {
        fprintf(stderr, "PyGILState_Check failed!");
        abort();
    }

    PyGILState_Release(state);

    PyThread_release_lock(lock);

    PyThread_exit_thread();
}

static int test_bpo20891(void)
{
    /* the test doesn't support custom memory allocators */
    putenv("PYTHONMALLOC=");

    /* bpo-20891: Calling PyGILState_Ensure in a non-Python thread must not
       crash. */
    PyThread_type_lock lock = PyThread_allocate_lock();
    if (!lock) {
        fprintf(stderr, "PyThread_allocate_lock failed!");
        return 1;
    }

    _testembed_Py_Initialize();

    unsigned long thrd = PyThread_start_new_thread(bpo20891_thread, &lock);
    if (thrd == PYTHREAD_INVALID_THREAD_ID) {
        fprintf(stderr, "PyThread_start_new_thread failed!");
        return 1;
    }
    PyThread_acquire_lock(lock, WAIT_LOCK);

    Py_BEGIN_ALLOW_THREADS
    /* wait until the thread exit */
    PyThread_acquire_lock(lock, WAIT_LOCK);
    Py_END_ALLOW_THREADS

    PyThread_free_lock(lock);

    return 0;
}

static int test_initialize_twice(void)
{
    _testembed_Py_Initialize();

    /* bpo-33932: Calling Py_Initialize() twice should do nothing
     * (and not crash!). */
    Py_Initialize();

    Py_Finalize();

    return 0;
}

static int test_initialize_pymain(void)
{
    wchar_t *argv[] = {L"PYTHON", L"-c",
                       (L"import sys; "
                        L"print(f'Py_Main() after Py_Initialize: "
                        L"sys.argv={sys.argv}')"),
                       L"arg2"};
    _testembed_Py_Initialize();

    /* bpo-34008: Calling Py_Main() after Py_Initialize() must not crash */
    Py_Main(Py_ARRAY_LENGTH(argv), argv);

    Py_Finalize();

    return 0;
}


static void
dump_config(void)
{
    (void) PyRun_SimpleStringFlags(
        "import _testinternalcapi, json; "
        "print(json.dumps(_testinternalcapi.get_configs()))",
        0);
}


static int test_init_initialize_config(void)
{
    _testembed_Py_Initialize();
    dump_config();
    Py_Finalize();
    return 0;
}


static void config_set_string(PyConfig *config, wchar_t **config_str, const wchar_t *str)
{
    PyStatus status = PyConfig_SetString(config, config_str, str);
    if (PyStatus_Exception(status)) {
        PyConfig_Clear(config);
        Py_ExitStatusException(status);
    }
}


static void config_set_argv(PyConfig *config, Py_ssize_t argc, wchar_t * const *argv)
{
    PyStatus status = PyConfig_SetArgv(config, argc, argv);
    if (PyStatus_Exception(status)) {
        PyConfig_Clear(config);
        Py_ExitStatusException(status);
    }
}


static void
config_set_wide_string_list(PyConfig *config, PyWideStringList *list,
                            Py_ssize_t length, wchar_t **items)
{
    PyStatus status = PyConfig_SetWideStringList(config, list, length, items);
    if (PyStatus_Exception(status)) {
        PyConfig_Clear(config);
        Py_ExitStatusException(status);
    }
}


static void config_set_program_name(PyConfig *config)
{
    const wchar_t *program_name = PROGRAM_NAME;
    config_set_string(config, &config->program_name, program_name);
}


static void init_from_config_clear(PyConfig *config)
{
    PyStatus status = Py_InitializeFromConfig(config);
    PyConfig_Clear(config);
    if (PyStatus_Exception(status)) {
        Py_ExitStatusException(status);
    }
}


static int check_init_compat_config(int preinit)
{
    PyStatus status;

    if (preinit) {
        PyPreConfig preconfig;
        _PyPreConfig_InitCompatConfig(&preconfig);

        status = Py_PreInitialize(&preconfig);
        if (PyStatus_Exception(status)) {
            Py_ExitStatusException(status);
        }
    }

    PyConfig config;
    _PyConfig_InitCompatConfig(&config);

    config_set_program_name(&config);
    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}


static int test_preinit_compat_config(void)
{
    return check_init_compat_config(1);
}


static int test_init_compat_config(void)
{
    return check_init_compat_config(0);
}


static int test_init_global_config(void)
{
    /* FIXME: test Py_IgnoreEnvironmentFlag */

    putenv("PYTHONUTF8=0");
    Py_UTF8Mode = 1;

    /* Test initialization from global configuration variables (Py_xxx) */
    Py_SetProgramName(L"./globalvar");

    /* Py_IsolatedFlag is not tested */
    Py_NoSiteFlag = 1;
    Py_BytesWarningFlag = 1;

    putenv("PYTHONINSPECT=");
    Py_InspectFlag = 1;

    putenv("PYTHONOPTIMIZE=0");
    Py_InteractiveFlag = 1;

    putenv("PYTHONDEBUG=0");
    Py_OptimizeFlag = 2;

    /* Py_DebugFlag is not tested */

    putenv("PYTHONDONTWRITEBYTECODE=");
    Py_DontWriteBytecodeFlag = 1;

    putenv("PYTHONVERBOSE=0");
    Py_VerboseFlag = 1;

    Py_QuietFlag = 1;
    Py_NoUserSiteDirectory = 1;

    putenv("PYTHONUNBUFFERED=");
    Py_UnbufferedStdioFlag = 1;

    Py_FrozenFlag = 1;

    /* FIXME: test Py_LegacyWindowsFSEncodingFlag */
    /* FIXME: test Py_LegacyWindowsStdioFlag */

    Py_Initialize();
    dump_config();
    Py_Finalize();
    return 0;
}


static int test_init_from_config(void)
{
    PyPreConfig preconfig;
    _PyPreConfig_InitCompatConfig(&preconfig);

    putenv("PYTHONMALLOC=malloc_debug");
    preconfig.allocator = PYMEM_ALLOCATOR_MALLOC;

    putenv("PYTHONUTF8=0");
    Py_UTF8Mode = 0;
    preconfig.utf8_mode = 1;

    PyStatus status = Py_PreInitialize(&preconfig);
    if (PyStatus_Exception(status)) {
        Py_ExitStatusException(status);
    }

    PyConfig config;
    _PyConfig_InitCompatConfig(&config);

    config.install_signal_handlers = 0;

    putenv("PYTHONOLDPARSER=1");
    config._use_peg_parser = 0;

    /* FIXME: test use_environment */

    putenv("PYTHONHASHSEED=42");
    config.use_hash_seed = 1;
    config.hash_seed = 123;

    /* dev_mode=1 is tested in test_init_dev_mode() */

    putenv("PYTHONFAULTHANDLER=");
    config.faulthandler = 1;

    putenv("PYTHONTRACEMALLOC=0");
    config.tracemalloc = 2;

    putenv("PYTHONPROFILEIMPORTTIME=0");
    config.import_time = 1;

    config.show_ref_count = 1;
    /* FIXME: test dump_refs: bpo-34223 */

    putenv("PYTHONMALLOCSTATS=0");
    config.malloc_stats = 1;

    putenv("PYTHONPYCACHEPREFIX=env_pycache_prefix");
    config_set_string(&config, &config.pycache_prefix, L"conf_pycache_prefix");

    Py_SetProgramName(L"./globalvar");
    config_set_string(&config, &config.program_name, L"./conf_program_name");

    wchar_t* argv[] = {
        L"python3",
        L"-W",
        L"cmdline_warnoption",
        L"-X",
        L"cmdline_xoption",
        L"-c",
        L"pass",
        L"arg2",
    };
    config_set_argv(&config, Py_ARRAY_LENGTH(argv), argv);
    config.parse_argv = 1;

    wchar_t* xoptions[3] = {
        L"config_xoption1=3",
        L"config_xoption2=",
        L"config_xoption3",
    };
    config_set_wide_string_list(&config, &config.xoptions,
                                Py_ARRAY_LENGTH(xoptions), xoptions);

    wchar_t* warnoptions[1] = {
        L"config_warnoption",
    };
    config_set_wide_string_list(&config, &config.warnoptions,
                                Py_ARRAY_LENGTH(warnoptions), warnoptions);

    /* FIXME: test pythonpath_env */
    /* FIXME: test home */
    /* FIXME: test path config: module_search_path .. dll_path */

    putenv("PYTHONPLATLIBDIR=env_platlibdir");
    status = PyConfig_SetBytesString(&config, &config.platlibdir, "my_platlibdir");
    if (PyStatus_Exception(status)) {
        PyConfig_Clear(&config);
        Py_ExitStatusException(status);
    }

    putenv("PYTHONVERBOSE=0");
    Py_VerboseFlag = 0;
    config.verbose = 1;

    Py_NoSiteFlag = 0;
    config.site_import = 0;

    Py_BytesWarningFlag = 0;
    config.bytes_warning = 1;

    putenv("PYTHONINSPECT=");
    Py_InspectFlag = 0;
    config.inspect = 1;

    Py_InteractiveFlag = 0;
    config.interactive = 1;

    putenv("PYTHONOPTIMIZE=0");
    Py_OptimizeFlag = 1;
    config.optimization_level = 2;

    /* FIXME: test parser_debug */

    putenv("PYTHONDONTWRITEBYTECODE=");
    Py_DontWriteBytecodeFlag = 0;
    config.write_bytecode = 0;

    Py_QuietFlag = 0;
    config.quiet = 1;

    config.configure_c_stdio = 1;

    putenv("PYTHONUNBUFFERED=");
    Py_UnbufferedStdioFlag = 0;
    config.buffered_stdio = 0;

    putenv("PYTHONIOENCODING=cp424");
    Py_SetStandardStreamEncoding("ascii", "ignore");
#ifdef MS_WINDOWS
    /* Py_SetStandardStreamEncoding() sets Py_LegacyWindowsStdioFlag to 1.
       Force it to 0 through the config. */
    config.legacy_windows_stdio = 0;
#endif
    config_set_string(&config, &config.stdio_encoding, L"iso8859-1");
    config_set_string(&config, &config.stdio_errors, L"replace");

    putenv("PYTHONNOUSERSITE=");
    Py_NoUserSiteDirectory = 0;
    config.user_site_directory = 0;

    config_set_string(&config, &config.check_hash_pycs_mode, L"always");

    Py_FrozenFlag = 0;
    config.pathconfig_warnings = 0;

    config._isolated_interpreter = 1;

    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}


static int check_init_parse_argv(int parse_argv)
{
    PyConfig config;
    PyConfig_InitPythonConfig(&config);

    config.parse_argv = parse_argv;

    wchar_t* argv[] = {
        L"./argv0",
        L"-E",
        L"-c",
        L"pass",
        L"arg1",
        L"-v",
        L"arg3",
    };
    config_set_argv(&config, Py_ARRAY_LENGTH(argv), argv);
    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}


static int test_init_parse_argv(void)
{
    return check_init_parse_argv(1);
}


static int test_init_dont_parse_argv(void)
{
    return check_init_parse_argv(0);
}


static void set_most_env_vars(void)
{
    putenv("PYTHONHASHSEED=42");
    putenv("PYTHONMALLOC=malloc");
    putenv("PYTHONTRACEMALLOC=2");
    putenv("PYTHONPROFILEIMPORTTIME=1");
    putenv("PYTHONMALLOCSTATS=1");
    putenv("PYTHONUTF8=1");
    putenv("PYTHONVERBOSE=1");
    putenv("PYTHONINSPECT=1");
    putenv("PYTHONOPTIMIZE=2");
    putenv("PYTHONDONTWRITEBYTECODE=1");
    putenv("PYTHONUNBUFFERED=1");
    putenv("PYTHONPYCACHEPREFIX=env_pycache_prefix");
    putenv("PYTHONNOUSERSITE=1");
    putenv("PYTHONFAULTHANDLER=1");
    putenv("PYTHONIOENCODING=iso8859-1:replace");
    putenv("PYTHONOLDPARSER=1");
    putenv("PYTHONPLATLIBDIR=env_platlibdir");
}


static void set_all_env_vars(void)
{
    set_most_env_vars();

    putenv("PYTHONWARNINGS=EnvVar");
    putenv("PYTHONPATH=/my/path");
}


static int test_init_compat_env(void)
{
    /* Test initialization from environment variables */
    Py_IgnoreEnvironmentFlag = 0;
    set_all_env_vars();
    _testembed_Py_Initialize();
    dump_config();
    Py_Finalize();
    return 0;
}


static int test_init_python_env(void)
{
    set_all_env_vars();

    PyConfig config;
    PyConfig_InitPythonConfig(&config);

    config_set_program_name(&config);
    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}


static void set_all_env_vars_dev_mode(void)
{
    putenv("PYTHONMALLOC=");
    putenv("PYTHONFAULTHANDLER=");
    putenv("PYTHONDEVMODE=1");
}


static int test_init_env_dev_mode(void)
{
    /* Test initialization from environment variables */
    Py_IgnoreEnvironmentFlag = 0;
    set_all_env_vars_dev_mode();
    _testembed_Py_Initialize();
    dump_config();
    Py_Finalize();
    return 0;
}


static int test_init_env_dev_mode_alloc(void)
{
    /* Test initialization from environment variables */
    Py_IgnoreEnvironmentFlag = 0;
    set_all_env_vars_dev_mode();
    putenv("PYTHONMALLOC=malloc");
    _testembed_Py_Initialize();
    dump_config();
    Py_Finalize();
    return 0;
}


static int test_init_isolated_flag(void)
{
    /* Test PyConfig.isolated=1 */
    PyConfig config;
    PyConfig_InitPythonConfig(&config);

    Py_IsolatedFlag = 0;
    config.isolated = 1;

    config_set_program_name(&config);
    set_all_env_vars();
    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}


/* PyPreConfig.isolated=1, PyConfig.isolated=0 */
static int test_preinit_isolated1(void)
{
    PyPreConfig preconfig;
    _PyPreConfig_InitCompatConfig(&preconfig);

    preconfig.isolated = 1;

    PyStatus status = Py_PreInitialize(&preconfig);
    if (PyStatus_Exception(status)) {
        Py_ExitStatusException(status);
    }

    PyConfig config;
    _PyConfig_InitCompatConfig(&config);

    config_set_program_name(&config);
    set_all_env_vars();
    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}


/* PyPreConfig.isolated=0, PyConfig.isolated=1 */
static int test_preinit_isolated2(void)
{
    PyPreConfig preconfig;
    _PyPreConfig_InitCompatConfig(&preconfig);

    preconfig.isolated = 0;

    PyStatus status = Py_PreInitialize(&preconfig);
    if (PyStatus_Exception(status)) {
        Py_ExitStatusException(status);
    }

    /* Test PyConfig.isolated=1 */
    PyConfig config;
    _PyConfig_InitCompatConfig(&config);

    Py_IsolatedFlag = 0;
    config.isolated = 1;

    config_set_program_name(&config);
    set_all_env_vars();
    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}


static int test_preinit_dont_parse_argv(void)
{
    PyPreConfig preconfig;
    PyPreConfig_InitIsolatedConfig(&preconfig);

    preconfig.isolated = 0;

    /* -X dev must be ignored by isolated preconfiguration */
    wchar_t *argv[] = {L"python3",
                       L"-E",
                       L"-I",
                       L"-X", L"dev",
                       L"-X", L"utf8",
                       L"script.py"};
    PyStatus status = Py_PreInitializeFromArgs(&preconfig,
                                               Py_ARRAY_LENGTH(argv), argv);
    if (PyStatus_Exception(status)) {
        Py_ExitStatusException(status);
    }

    PyConfig config;
    PyConfig_InitIsolatedConfig(&config);

    config.isolated = 0;

    /* Pre-initialize implicitly using argv: make sure that -X dev
       is used to configure the allocation in preinitialization */
    config_set_argv(&config, Py_ARRAY_LENGTH(argv), argv);
    config_set_program_name(&config);
    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}


static int test_preinit_parse_argv(void)
{
    PyConfig config;
    PyConfig_InitPythonConfig(&config);

    /* Pre-initialize implicitly using argv: make sure that -X dev
       is used to configure the allocation in preinitialization */
    wchar_t *argv[] = {L"python3", L"-X", L"dev", L"script.py"};
    config_set_argv(&config, Py_ARRAY_LENGTH(argv), argv);
    config_set_program_name(&config);
    init_from_config_clear(&config);

    dump_config();
    Py_Finalize();
    return 0;
}




static void set_all_global_config_variables(void)
{
    Py_IsolatedFlag = 0;
    Py_IgnoreEnvironmentFlag = 0;
    Py_BytesWarningFlag = 2;
    Py_InspectFlag = 1;
    Py_InteractiveFlag = 1;
    Py_OptimizeFlag = 1;
    Py_DebugFlag = 1;
    Py_VerboseFlag = 1;
    Py_QuietFlag = 1;
    Py_FrozenFlag = 0;
    Py_UnbufferedStdioFlag = 1;
    Py_NoSiteFlag = 1;
    Py_DontWriteBytecodeFlag = 1;
    Py_NoUserSiteDirectory = 1;
#ifdef MS_WINDOWS
    Py_LegacyWindowsStdioFlag = 1;
#endif
}


static int check_preinit_isolated_config(int preinit)
{
    PyStatus status;
    PyPreConfig *rt_preconfig;

    /* environment variables must be ignored */
    set_all_env_vars();

    /* global configuration variables must be ignored */
    set_all_global_config_variables();

    if (preinit) {
        PyPreConfig preconfig;
        PyPreConfig_InitIsolatedConfig(&preconfig);

        status = Py_PreInitialize(&preconfig);
        if (PyStatus_Exception(status)) {
            Py_ExitStatusException(status);
        }

        rt_preconfig = &_PyRuntime.preconfig;
        assert(rt_preconfig->isolated == 1);
        assert(rt_preconfig->use_environment == 0);
    }

    PyConfig config;
    PyConfig_InitIsolatedConfig(&config);

    config_set_program_name(&config);
    init_from_config_clear(&config);

    rt_preconfig = &_PyRuntime.preconfig;
    assert(rt_preconfig->isolated == 1);
    assert(rt_preconfig->use_environment == 0);

    dump_config();
    Py_Finalize();
    return 0;
}


static int test_preinit_isolated_config(void)
{
    return check_preinit_isolated_config(1);
}


static int test_init_isolated_config(void)
{
    return check_preinit_isolated_config(0);
}


static int check_init_python_config(int preinit)
{
    /* global configuration variables must be ignored */
    set_all_global_config_variables();
    Py_IsolatedFlag = 1;
    Py_IgnoreEnvironmentFlag = 1;
    Py_FrozenFlag = 1;
    Py_UnbufferedStdioFlag = 1;
    Py_NoSiteFlag = 1;
    Py_DontWriteBytecodeFlag = 1;
    Py_NoUserSiteDirectory = 1;
#ifdef MS_WINDOWS
    Py_LegacyWindowsStdioFlag = 1;
#endif

    if (preinit) {
        PyPreConfig preconfig;
        PyPreConfig_InitPythonConfig(&preconfig);

        PyStatus status = Py_PreInitialize(&preconfig);
        if (PyStatus_Exception(status)) {
            Py_ExitStatusException(status);
        }
    }

    PyConfig config;