initconfig.h

#ifndef Py_PYCORECONFIG_H
#define Py_PYCORECONFIG_H
#ifndef Py_LIMITED_API
#ifdef __cplusplus
extern "C" {
#endif

/* --- PyStatus ----------------------------------------------- */

typedef struct {
    enum {
        _PyStatus_TYPE_OK=0,
        _PyStatus_TYPE_ERROR=1,
        _PyStatus_TYPE_EXIT=2
    } _type;
    const char *func;
    const char *err_msg;
    int exitcode;
} PyStatus;

PyAPI_FUNC(PyStatus) PyStatus_Ok(void);
PyAPI_FUNC(PyStatus) PyStatus_Error(const char *err_msg);
PyAPI_FUNC(PyStatus) PyStatus_NoMemory(void);
PyAPI_FUNC(PyStatus) PyStatus_Exit(int exitcode);
PyAPI_FUNC(int) PyStatus_IsError(PyStatus err);
PyAPI_FUNC(int) PyStatus_IsExit(PyStatus err);
PyAPI_FUNC(int) PyStatus_Exception(PyStatus err);
PyAPI_FUNC(PyObject *) _PyErr_SetFromPyStatus(PyStatus status);

/* --- PyWideStringList ------------------------------------------------ */

typedef struct {
    /* If length is greater than zero, items must be non-NULL
       and all items strings must be non-NULL */
    Py_ssize_t length;
    wchar_t **items;
} PyWideStringList;

PyAPI_FUNC(PyStatus) PyWideStringList_Append(PyWideStringList *list,
    const wchar_t *item);
PyAPI_FUNC(PyStatus) PyWideStringList_Insert(PyWideStringList *list,
    Py_ssize_t index,
    const wchar_t *item);


/* --- PyPreConfig ----------------------------------------------- */

typedef struct PyPreConfig {
    int _config_init;     /* _PyConfigInitEnum value */

    /* Parse Py_PreInitializeFromBytesArgs() arguments?
       See PyConfig.parse_argv */
    int parse_argv;

    /* If greater than 0, enable isolated mode: sys.path contains
       neither the script's directory nor the user's site-packages directory.

       Set to 1 by the -I command line option. If set to -1 (default), inherit
       Py_IsolatedFlag value. */
    int isolated;

    /* If greater than 0: use environment variables.
       Set to 0 by -E command line option. If set to -1 (default), it is
       set to !Py_IgnoreEnvironmentFlag. */
    int use_environment;

    /* Set the LC_CTYPE locale to the user preferred locale? If equals to 0,
       set coerce_c_locale and coerce_c_locale_warn to 0. */
    int configure_locale;

    /* Coerce the LC_CTYPE locale if it's equal to "C"? (PEP 538)

       Set to 0 by PYTHONCOERCECLOCALE=0. Set to 1 by PYTHONCOERCECLOCALE=1.
       Set to 2 if the user preferred LC_CTYPE locale is "C".

       If it is equal to 1, LC_CTYPE locale is read to decide if it should be
       coerced or not (ex: PYTHONCOERCECLOCALE=1). Internally, it is set to 2
       if the LC_CTYPE locale must be coerced.

       Disable by default (set to 0). Set it to -1 to let Python decide if it
       should be enabled or not. */
    int coerce_c_locale;

    /* Emit a warning if the LC_CTYPE locale is coerced?

       Set to 1 by PYTHONCOERCECLOCALE=warn.

       Disable by default (set to 0). Set it to -1 to let Python decide if it
       should be enabled or not. */
    int coerce_c_locale_warn;

#ifdef MS_WINDOWS
    /* If greater than 1, use the "mbcs" encoding instead of the UTF-8
       encoding for the filesystem encoding.

       Set to 1 if the PYTHONLEGACYWINDOWSFSENCODING environment variable is
       set to a non-empty string. If set to -1 (default), inherit
       Py_LegacyWindowsFSEncodingFlag value.

       See PEP 529 for more details. */
    int legacy_windows_fs_encoding;
#endif

    /* Enable UTF-8 mode? (PEP 540)

       Disabled by default (equals to 0).

       Set to 1 by "-X utf8" and "-X utf8=1" command line options.
       Set to 1 by PYTHONUTF8=1 environment variable.

       Set to 0 by "-X utf8=0" and PYTHONUTF8=0.

       If equals to -1, it is set to 1 if the LC_CTYPE locale is "C" or
       "POSIX", otherwise it is set to 0. Inherit Py_UTF8Mode value value. */
    int utf8_mode;

    /* If non-zero, enable the Python Development Mode.

       Set to 1 by the -X dev command line option. Set by the PYTHONDEVMODE
       environment variable. */
    int dev_mode;

    /* Memory allocator: PYTHONMALLOC env var.
       See PyMemAllocatorName for valid values. */
    int allocator;
} PyPreConfig;

PyAPI_FUNC(void) PyPreConfig_InitPythonConfig(PyPreConfig *config);
PyAPI_FUNC(void) PyPreConfig_InitIsolatedConfig(PyPreConfig *config);


/* --- PyConfig ---------------------------------------------- */

/* This structure is best documented in the Doc/c-api/init_config.rst file. */
typedef struct PyConfig {
    int _config_init;     /* _PyConfigInitEnum value */

    int isolated;
    int use_environment;
    int dev_mode;
    int install_signal_handlers;
    int use_hash_seed;
    unsigned long hash_seed;
    int faulthandler;
    int tracemalloc;
    int perf_profiling;
    int import_time;
    int code_debug_ranges;
    int show_ref_count;
    int dump_refs;
    wchar_t *dump_refs_file;
    int malloc_stats;
    wchar_t *filesystem_encoding;
    wchar_t *filesystem_errors;
    wchar_t *pycache_prefix;
    int parse_argv;
    PyWideStringList orig_argv;
    PyWideStringList argv;
    PyWideStringList xoptions;
    PyWideStringList warnoptions;
    int site_import;
    int bytes_warning;
    int warn_default_encoding;
    int inspect;
    int interactive;
    int optimization_level;
    int parser_debug;
    int write_bytecode;
    int verbose;
    int quiet;
    int user_site_directory;
    int configure_c_stdio;
    int buffered_stdio;
    wchar_t *stdio_encoding;
    wchar_t *stdio_errors;
#ifdef MS_WINDOWS
    int legacy_windows_stdio;
#endif
    wchar_t *check_hash_pycs_mode;
    int use_frozen_modules;
    int safe_path;
    int int_max_str_digits;

    /* --- Path configuration inputs ------------ */
    int pathconfig_warnings;
    wchar_t *program_name;
    wchar_t *pythonpath_env;
    wchar_t *home;
    wchar_t *platlibdir;

    /* --- Path configuration outputs ----------- */
    int module_search_paths_set;
    PyWideStringList module_search_paths;
    wchar_t *stdlib_dir;
    wchar_t *executable;
    wchar_t *base_executable;
    wchar_t *prefix;
    wchar_t *base_prefix;
    wchar_t *exec_prefix;
    wchar_t *base_exec_prefix;

    /* --- Parameter only used by Py_Main() ---------- */
    int skip_source_first_line;
    wchar_t *run_command;
    wchar_t *run_module;
    wchar_t *run_filename;

    /* --- Private fields ---------------------------- */

    // Install importlib? If equals to 0, importlib is not initialized at all.
    // Needed by freeze_importlib.
    int _install_importlib;

    // If equal to 0, stop Python initialization before the "main" phase.
    int _init_main;

    // If non-zero, we believe we're running from a source tree.
    int _is_python_build;
} PyConfig;

PyAPI_FUNC(void) PyConfig_InitPythonConfig(PyConfig *config);
PyAPI_FUNC(void) PyConfig_InitIsolatedConfig(PyConfig *config);
PyAPI_FUNC(void) PyConfig_Clear(PyConfig *);
PyAPI_FUNC(PyStatus) PyConfig_SetString(
    PyConfig *config,
    wchar_t **config_str,
    const wchar_t *str);
PyAPI_FUNC(PyStatus) PyConfig_SetBytesString(
    PyConfig *config,
    wchar_t **config_str,
    const char *str);
PyAPI_FUNC(PyStatus) PyConfig_Read(PyConfig *config);
PyAPI_FUNC(PyStatus) PyConfig_SetBytesArgv(
    PyConfig *config,
    Py_ssize_t argc,
    char * const *argv);
PyAPI_FUNC(PyStatus) PyConfig_SetArgv(PyConfig *config,
    Py_ssize_t argc,
    wchar_t * const *argv);
PyAPI_FUNC(PyStatus) PyConfig_SetWideStringList(PyConfig *config,
    PyWideStringList *list,
    Py_ssize_t length, wchar_t **items);


/* --- PyInterpreterConfig ------------------------------------ */

typedef struct {
    // XXX "allow_object_sharing"?  "own_objects"?
    int use_main_obmalloc;
    int allow_fork;
    int allow_exec;
    int allow_threads;
    int allow_daemon_threads;
    int check_multi_interp_extensions;
    int own_gil;
} PyInterpreterConfig;

#define _PyInterpreterConfig_INIT \
    { \
        .use_main_obmalloc = 0, \
        .allow_fork = 0, \
        .allow_exec = 0, \
        .allow_threads = 1, \
        .allow_daemon_threads = 0, \
        .check_multi_interp_extensions = 1, \
        .own_gil = 1, \
    }

#define _PyInterpreterConfig_LEGACY_INIT \
    { \
        .use_main_obmalloc = 1, \
        .allow_fork = 1, \
        .allow_exec = 1, \
        .allow_threads = 1, \
        .allow_daemon_threads = 1, \
        .check_multi_interp_extensions = 0, \
        .own_gil = 0, \
    }

/* --- Helper functions --------------------------------------- */

/* Get the original command line arguments, before Python modified them.

   See also PyConfig.orig_argv. */
PyAPI_FUNC(void) Py_GetArgcArgv(int *argc, wchar_t ***argv);

#ifdef __cplusplus
}
#endif
#endif /* !Py_LIMITED_API */
#endif /* !Py_PYCORECONFIG_H */