Modules/main.c - platform/external/python/cpython3 - Git at Google

 /* Python interpreter main program */

 #include "Python.h"
 #include "pycore_initconfig.h"
 #include "pycore_pylifecycle.h"
 #include "pycore_pymem.h"
 #include "pycore_pystate.h"

 #ifdef __FreeBSD__
 #  include <fenv.h>     /* fedisableexcept() */
 #endif

 /* Includes for exit_sigint() */
 #include <stdio.h>      /* perror() */
 #ifdef HAVE_SIGNAL_H
 #  include <signal.h>   /* SIGINT */
 #endif
 #if defined(HAVE_GETPID) && defined(HAVE_UNISTD_H)
 #  include <unistd.h>   /* getpid() */
 #endif
 #ifdef MS_WINDOWS
 #  include <windows.h>  /* STATUS_CONTROL_C_EXIT */
 #endif
 /* End of includes for exit_sigint() */

 #define COPYRIGHT \
     "Type \"help\", \"copyright\", \"credits\" or \"license\" " \
     "for more information."

 #ifdef __cplusplus
 extern "C" {
 #endif

 /* --- pymain_init() ---------------------------------------------- */

 static PyStatus
 pymain_init(const _PyArgv *args)
 {
     PyStatus status;

     status = _PyRuntime_Initialize();
     if (_PyStatus_EXCEPTION(status)) {
         return status;
     }

     /* 754 requires that FP exceptions run in "no stop" mode by default,
      * and until C vendors implement C99's ways to control FP exceptions,
      * Python requires non-stop mode.  Alas, some platforms enable FP
      * exceptions by default.  Here we disable them.
      */
 #ifdef __FreeBSD__
     fedisableexcept(FE_OVERFLOW);
 #endif

     PyPreConfig preconfig;
     PyPreConfig_InitPythonConfig(&preconfig);

     status = _Py_PreInitializeFromPyArgv(&preconfig, args);
     if (_PyStatus_EXCEPTION(status)) {
         return status;
     }

     PyConfig config;
     PyConfig_InitPythonConfig(&config);

     /* pass NULL as the config: config is read from command line arguments,
        environment variables, configuration files */
     if (args->use_bytes_argv) {
         status = PyConfig_SetBytesArgv(&config, args->argc, args->bytes_argv);
     }
     else {
         status = PyConfig_SetArgv(&config, args->argc, args->wchar_argv);
     }
     if (_PyStatus_EXCEPTION(status)) {
         goto done;
     }

     status = Py_InitializeFromConfig(&config);
     if (_PyStatus_EXCEPTION(status)) {
         goto done;
     }
     status = _PyStatus_OK();

 done:
     PyConfig_Clear(&config);
     return status;
 }


 /* --- pymain_run_python() ---------------------------------------- */

 /* Non-zero if filename, command (-c) or module (-m) is set
    on the command line */
 static inline int config_run_code(const PyConfig *config)
 {
     return (config->run_command != NULL
             || config->run_filename != NULL
             || config->run_module != NULL);
 }


 /* Return non-zero is stdin is a TTY or if -i command line option is used */
 static int
 stdin_is_interactive(const PyConfig *config)
 {
     return (isatty(fileno(stdin)) || config->interactive);
 }


 /* Display the current Python exception and return an exitcode */
 static int
 pymain_err_print(int *exitcode_p)
 {
     int exitcode;
     if (_Py_HandleSystemExit(&exitcode)) {
         *exitcode_p = exitcode;
         return 1;
     }

     PyErr_Print();
     return 0;
 }


 static int
 pymain_exit_err_print(void)
 {
     int exitcode = 1;
     pymain_err_print(&exitcode);
     return exitcode;
 }


 /* Write an exitcode into *exitcode and return 1 if we have to exit Python.
    Return 0 otherwise. */
 static int
 pymain_get_importer(const wchar_t *filename, PyObject **importer_p, int *exitcode)
 {
     PyObject *sys_path0 = NULL, *importer;

     sys_path0 = PyUnicode_FromWideChar(filename, wcslen(filename));
     if (sys_path0 == NULL) {
         goto error;
     }

     importer = PyImport_GetImporter(sys_path0);
     if (importer == NULL) {
         goto error;
     }

     if (importer == Py_None) {
         Py_DECREF(sys_path0);
         Py_DECREF(importer);
         return 0;
     }

     Py_DECREF(importer);
     *importer_p = sys_path0;
     return 0;

 error:
     Py_XDECREF(sys_path0);

     PySys_WriteStderr("Failed checking if argv[0] is an import path entry\n");
     return pymain_err_print(exitcode);
 }


 static int
 pymain_sys_path_add_path0(PyInterpreterState *interp, PyObject *path0)
 {
     _Py_IDENTIFIER(path);
     PyObject *sys_path;
     PyObject *sysdict = interp->sysdict;
     if (sysdict != NULL) {
         sys_path = _PyDict_GetItemIdWithError(sysdict, &PyId_path);
         if (sys_path == NULL && PyErr_Occurred()) {
             return -1;
         }
     }
     else {
         sys_path = NULL;
     }
     if (sys_path == NULL) {
         PyErr_SetString(PyExc_RuntimeError, "unable to get sys.path");
         return -1;
     }

     if (PyList_Insert(sys_path, 0, path0)) {
         return -1;
     }
     return 0;
 }


 static void
 pymain_header(const PyConfig *config)
 {
     if (config->quiet) {
         return;
     }

     if (!config->verbose && (config_run_code(config) || !stdin_is_interactive(config))) {
         return;
     }

     fprintf(stderr, "Python %s on %s\n", Py_GetVersion(), Py_GetPlatform());
     if (config->site_import) {
         fprintf(stderr, "%s\n", COPYRIGHT);
     }
 }


 static void
 pymain_import_readline(const PyConfig *config)
 {
     if (config->isolated) {
         return;
     }
     if (!config->inspect && config_run_code(config)) {
         return;
     }
     if (!isatty(fileno(stdin))) {
         return;
     }

     PyObject *mod = PyImport_ImportModule("readline");
     if (mod == NULL) {
         PyErr_Clear();
     }
     else {
         Py_DECREF(mod);
     }
 }


 static int
 pymain_run_command(wchar_t *command, PyCompilerFlags *cf)
 {
     PyObject *unicode, *bytes;
     int ret;

     unicode = PyUnicode_FromWideChar(command, -1);
     if (unicode == NULL) {
         goto error;
     }

     if (PySys_Audit("cpython.run_command", "O", unicode) < 0) {
         return pymain_exit_err_print();
     }

     bytes = PyUnicode_AsUTF8String(unicode);
     Py_DECREF(unicode);
     if (bytes == NULL) {
         goto error;
     }

     ret = PyRun_SimpleStringFlags(PyBytes_AsString(bytes), cf);
     Py_DECREF(bytes);
     return (ret != 0);

 error:
     PySys_WriteStderr("Unable to decode the command from the command line:\n");
     return pymain_exit_err_print();
 }


 static int
 pymain_run_module(const wchar_t *modname, int set_argv0)
 {
     PyObject *module, *runpy, *runmodule, *runargs, *result;
     if (PySys_Audit("cpython.run_module", "u", modname) < 0) {
         return pymain_exit_err_print();
     }
     runpy = PyImport_ImportModule("runpy");
     if (runpy == NULL) {
         fprintf(stderr, "Could not import runpy module\n");
         return pymain_exit_err_print();
     }
     runmodule = PyObject_GetAttrString(runpy, "_run_module_as_main");
     if (runmodule == NULL) {
         fprintf(stderr, "Could not access runpy._run_module_as_main\n");
         Py_DECREF(runpy);
         return pymain_exit_err_print();
     }
     module = PyUnicode_FromWideChar(modname, wcslen(modname));
     if (module == NULL) {
         fprintf(stderr, "Could not convert module name to unicode\n");
         Py_DECREF(runpy);
         Py_DECREF(runmodule);
         return pymain_exit_err_print();
     }
     runargs = Py_BuildValue("(Oi)", module, set_argv0);
     if (runargs == NULL) {
         fprintf(stderr,
             "Could not create arguments for runpy._run_module_as_main\n");
         Py_DECREF(runpy);
         Py_DECREF(runmodule);
         Py_DECREF(module);
         return pymain_exit_err_print();
     }
     result = PyObject_Call(runmodule, runargs, NULL);
     Py_DECREF(runpy);
     Py_DECREF(runmodule);
     Py_DECREF(module);
     Py_DECREF(runargs);
     if (result == NULL) {
         return pymain_exit_err_print();
     }
     Py_DECREF(result);
     return 0;
 }


 static int
 pymain_run_file(PyConfig *config, PyCompilerFlags *cf)
 {
     const wchar_t *filename = config->run_filename;
     if (PySys_Audit("cpython.run_file", "u", filename) < 0) {
         return pymain_exit_err_print();
     }
     FILE *fp = _Py_wfopen(filename, L"rb");
     if (fp == NULL) {
         char *cfilename_buffer;
         const char *cfilename;
         int err = errno;
         cfilename_buffer = _Py_EncodeLocaleRaw(filename, NULL);
         if (cfilename_buffer != NULL)
             cfilename = cfilename_buffer;
         else
             cfilename = "<unprintable file name>";
         fprintf(stderr, "%ls: can't open file '%s': [Errno %d] %s\n",
                 config->program_name, cfilename, err, strerror(err));
         PyMem_RawFree(cfilename_buffer);
         return 2;
     }

     if (config->skip_source_first_line) {
         int ch;
         /* Push back first newline so line numbers remain the same */
         while ((ch = getc(fp)) != EOF) {
             if (ch == '\n') {
                 (void)ungetc(ch, fp);
                 break;
             }
         }
     }

     struct _Py_stat_struct sb;
     if (_Py_fstat_noraise(fileno(fp), &sb) == 0 && S_ISDIR(sb.st_mode)) {
         fprintf(stderr,
                 "%ls: '%ls' is a directory, cannot continue\n",
                 config->program_name, filename);
         fclose(fp);
         return 1;
     }

     /* call pending calls like signal handlers (SIGINT) */
     if (Py_MakePendingCalls() == -1) {
         fclose(fp);
         return pymain_exit_err_print();
     }

     PyObject *unicode, *bytes = NULL;
     const char *filename_str;

     unicode = PyUnicode_FromWideChar(filename, wcslen(filename));
     if (unicode != NULL) {
         bytes = PyUnicode_EncodeFSDefault(unicode);
         Py_DECREF(unicode);
     }
     if (bytes != NULL) {
         filename_str = PyBytes_AsString(bytes);
     }
     else {
         PyErr_Clear();
         filename_str = "<filename encoding error>";
     }

     /* PyRun_AnyFileExFlags(closeit=1) calls fclose(fp) before running code */
     int run = PyRun_AnyFileExFlags(fp, filename_str, 1, cf);
     Py_XDECREF(bytes);
     return (run != 0);
 }


 static int
 pymain_run_startup(PyConfig *config, PyCompilerFlags *cf, int *exitcode)
 {
     const char *startup = _Py_GetEnv(config->use_environment, "PYTHONSTARTUP");
     if (startup == NULL) {
         return 0;
     }
     if (PySys_Audit("cpython.run_startup", "s", startup) < 0) {
         return pymain_err_print(exitcode);
     }

     FILE *fp = _Py_fopen(startup, "r");
     if (fp == NULL) {
         int save_errno = errno;
         PySys_WriteStderr("Could not open PYTHONSTARTUP\n");

         errno = save_errno;
         PyErr_SetFromErrnoWithFilename(PyExc_OSError, startup);

         return pymain_err_print(exitcode);
     }

     (void) PyRun_SimpleFileExFlags(fp, startup, 0, cf);
     PyErr_Clear();
     fclose(fp);
     return 0;
 }


 /* Write an exitcode into *exitcode and return 1 if we have to exit Python.
    Return 0 otherwise. */
 static int
 pymain_run_interactive_hook(int *exitcode)
 {
     PyObject *sys, *hook, *result;
     sys = PyImport_ImportModule("sys");
     if (sys == NULL) {
         goto error;
     }

     hook = PyObject_GetAttrString(sys, "__interactivehook__");
     Py_DECREF(sys);
     if (hook == NULL) {
         PyErr_Clear();
         return 0;
     }

     if (PySys_Audit("cpython.run_interactivehook", "O", hook) < 0) {
         goto error;
     }

     result = _PyObject_CallNoArg(hook);
     Py_DECREF(hook);
     if (result == NULL) {
         goto error;
     }
     Py_DECREF(result);

     return 0;

 error:
     PySys_WriteStderr("Failed calling sys.__interactivehook__\n");
     return pymain_err_print(exitcode);
 }


 static int
 pymain_run_stdin(PyConfig *config, PyCompilerFlags *cf)
 {
     if (stdin_is_interactive(config)) {
         config->inspect = 0;
         Py_InspectFlag = 0; /* do exit on SystemExit */

         int exitcode;
         if (pymain_run_startup(config, cf, &exitcode)) {
             return exitcode;
         }

         if (pymain_run_interactive_hook(&exitcode)) {
             return exitcode;
         }
     }

     /* call pending calls like signal handlers (SIGINT) */
     if (Py_MakePendingCalls() == -1) {
         return pymain_exit_err_print();
     }

     if (PySys_Audit("cpython.run_stdin", NULL) < 0) {
         return pymain_exit_err_print();
     }

     int run = PyRun_AnyFileExFlags(stdin, "<stdin>", 0, cf);
     return (run != 0);
 }


 static void
 pymain_repl(PyConfig *config, PyCompilerFlags *cf, int *exitcode)
 {
     /* Check this environment variable at the end, to give programs the
        opportunity to set it from Python. */
     if (!config->inspect && _Py_GetEnv(config->use_environment, "PYTHONINSPECT")) {
         config->inspect = 1;
         Py_InspectFlag = 1;
     }

     if (!(config->inspect && stdin_is_interactive(config) && config_run_code(config))) {
         return;
     }

     config->inspect = 0;
     Py_InspectFlag = 0;
     if (pymain_run_interactive_hook(exitcode)) {
         return;
     }

     int res = PyRun_AnyFileFlags(stdin, "<stdin>", cf);
     *exitcode = (res != 0);
 }


 static void
 pymain_run_python(int *exitcode)
 {
     PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE();
     /* pymain_run_stdin() modify the config */
     PyConfig *config = &interp->config;

     PyObject *main_importer_path = NULL;
     if (config->run_filename != NULL) {
         /* If filename is a package (ex: directory or ZIP file) which contains
            __main__.py, main_importer_path is set to filename and will be
            prepended to sys.path.

            Otherwise, main_importer_path is left unchanged. */
         if (pymain_get_importer(config->run_filename, &main_importer_path,
                                 exitcode)) {
             return;
         }
     }

     if (main_importer_path != NULL) {
         if (pymain_sys_path_add_path0(interp, main_importer_path) < 0) {
             goto error;
         }
     }
     else if (!config->isolated) {
         PyObject *path0 = NULL;
         int res = _PyPathConfig_ComputeSysPath0(&config->argv, &path0);
         if (res < 0) {
             goto error;
         }

         if (res > 0) {
             if (pymain_sys_path_add_path0(interp, path0) < 0) {
                 Py_DECREF(path0);
                 goto error;
             }
             Py_DECREF(path0);
         }
     }

     PyCompilerFlags cf = _PyCompilerFlags_INIT;

     pymain_header(config);
     pymain_import_readline(config);

     if (config->run_command) {
         *exitcode = pymain_run_command(config->run_command, &cf);
     }
     else if (config->run_module) {
         *exitcode = pymain_run_module(config->run_module, 1);
     }
     else if (main_importer_path != NULL) {
         *exitcode = pymain_run_module(L"__main__", 0);
     }
     else if (config->run_filename != NULL) {
         *exitcode = pymain_run_file(config, &cf);
     }
     else {
         *exitcode = pymain_run_stdin(config, &cf);
     }

     pymain_repl(config, &cf, exitcode);
     goto done;

 error:
     *exitcode = pymain_exit_err_print();

 done:
     Py_XDECREF(main_importer_path);
 }


 /* --- pymain_main() ---------------------------------------------- */

 static void
 pymain_free(void)
 {
     _PyImport_Fini2();

     /* Free global variables which cannot be freed in Py_Finalize():
        configuration options set before Py_Initialize() which should
        remain valid after Py_Finalize(), since
        Py_Initialize()-Py_Finalize() can be called multiple times. */
     _PyPathConfig_ClearGlobal();
     _Py_ClearStandardStreamEncoding();
     _Py_ClearArgcArgv();
     _PyRuntime_Finalize();
 }


 static int
 exit_sigint(void)
 {
     /* bpo-1054041: We need to exit via the
      * SIG_DFL handler for SIGINT if KeyboardInterrupt went unhandled.
      * If we don't, a calling process such as a shell may not know
      * about the user's ^C.  https://www.cons.org/cracauer/sigint.html */
 #if defined(HAVE_GETPID) && !defined(MS_WINDOWS)
     if (PyOS_setsig(SIGINT, SIG_DFL) == SIG_ERR) {
         perror("signal");  /* Impossible in normal environments. */
     } else {
         kill(getpid(), SIGINT);
     }
     /* If setting SIG_DFL failed, or kill failed to terminate us,
      * there isn't much else we can do aside from an error code. */
 #endif  /* HAVE_GETPID && !MS_WINDOWS */
 #ifdef MS_WINDOWS
     /* cmd.exe detects this, prints ^C, and offers to terminate. */
     /* https://msdn.microsoft.com/en-us/library/cc704588.aspx */
     return STATUS_CONTROL_C_EXIT;
 #else
     return SIGINT + 128;
 #endif  /* !MS_WINDOWS */
 }


 static void _Py_NO_RETURN
 pymain_exit_error(PyStatus status)
 {
     if (_PyStatus_IS_EXIT(status)) {
         /* If it's an error rather than a regular exit, leave Python runtime
            alive: Py_ExitStatusException() uses the current exception and use
            sys.stdout in this case. */
         pymain_free();
     }
     Py_ExitStatusException(status);
 }


 int
 Py_RunMain(void)
 {
     int exitcode = 0;

     pymain_run_python(&exitcode);

     if (Py_FinalizeEx() < 0) {
         /* Value unlikely to be confused with a non-error exit status or
            other special meaning */
         exitcode = 120;
     }

     pymain_free();

     if (_Py_UnhandledKeyboardInterrupt) {
         exitcode = exit_sigint();
     }

     return exitcode;
 }


 static int
 pymain_main(_PyArgv *args)
 {
     PyStatus status = pymain_init(args);
     if (_PyStatus_IS_EXIT(status)) {
         pymain_free();
         return status.exitcode;
     }
     if (_PyStatus_EXCEPTION(status)) {
         pymain_exit_error(status);
     }

     return Py_RunMain();
 }


 int
 Py_Main(int argc, wchar_t **argv)
 {
     _PyArgv args = {
         .argc = argc,
         .use_bytes_argv = 0,
         .bytes_argv = NULL,
         .wchar_argv = argv};
     return pymain_main(&args);
 }


 int
 Py_BytesMain(int argc, char **argv)
 {
     _PyArgv args = {
         .argc = argc,
         .use_bytes_argv = 1,
         .bytes_argv = argv,
         .wchar_argv = NULL};
     return pymain_main(&args);
 }

 #ifdef __cplusplus
 }
 #endif
	/* Python interpreter main program */

	#include "Python.h"
	#include "pycore_initconfig.h"
	#include "pycore_pylifecycle.h"
	#include "pycore_pymem.h"
	#include "pycore_pystate.h"

	#ifdef __FreeBSD__
	# include <fenv.h> /* fedisableexcept() */
	#endif

	/* Includes for exit_sigint() */
	#include <stdio.h> /* perror() */
	#ifdef HAVE_SIGNAL_H
	# include <signal.h> /* SIGINT */
	#endif
	#if defined(HAVE_GETPID) && defined(HAVE_UNISTD_H)
	# include <unistd.h> /* getpid() */
	#endif
	#ifdef MS_WINDOWS
	# include <windows.h> /* STATUS_CONTROL_C_EXIT */
	#endif
	/* End of includes for exit_sigint() */

	#define COPYRIGHT \
	"Type \"help\", \"copyright\", \"credits\" or \"license\" " \
	"for more information."

	#ifdef __cplusplus
	extern "C" {
	#endif

	/* --- pymain_init() ---------------------------------------------- */

	static PyStatus
	pymain_init(const _PyArgv *args)
	{
	PyStatus status;

	status = _PyRuntime_Initialize();
	if (_PyStatus_EXCEPTION(status)) {
	return status;
	}

	/* 754 requires that FP exceptions run in "no stop" mode by default,
	* and until C vendors implement C99's ways to control FP exceptions,
	* Python requires non-stop mode. Alas, some platforms enable FP
	* exceptions by default. Here we disable them.
	*/
	#ifdef __FreeBSD__
	fedisableexcept(FE_OVERFLOW);
	#endif

	PyPreConfig preconfig;
	PyPreConfig_InitPythonConfig(&preconfig);

	status = _Py_PreInitializeFromPyArgv(&preconfig, args);
	if (_PyStatus_EXCEPTION(status)) {
	return status;
	}

	PyConfig config;
	PyConfig_InitPythonConfig(&config);

	/* pass NULL as the config: config is read from command line arguments,
	environment variables, configuration files */
	if (args->use_bytes_argv) {
	status = PyConfig_SetBytesArgv(&config, args->argc, args->bytes_argv);
	}
	else {
	status = PyConfig_SetArgv(&config, args->argc, args->wchar_argv);
	}
	if (_PyStatus_EXCEPTION(status)) {
	goto done;
	}

	status = Py_InitializeFromConfig(&config);
	if (_PyStatus_EXCEPTION(status)) {
	goto done;
	}
	status = _PyStatus_OK();

	done:
	PyConfig_Clear(&config);
	return status;
	}


	/* --- pymain_run_python() ---------------------------------------- */

	/* Non-zero if filename, command (-c) or module (-m) is set
	on the command line */
	static inline int config_run_code(const PyConfig *config)
	{
	return (config->run_command != NULL
	\|\| config->run_filename != NULL
	\|\| config->run_module != NULL);
	}


	/* Return non-zero is stdin is a TTY or if -i command line option is used */
	static int
	stdin_is_interactive(const PyConfig *config)
	{
	return (isatty(fileno(stdin)) \|\| config->interactive);
	}


	/* Display the current Python exception and return an exitcode */
	static int
	pymain_err_print(int *exitcode_p)
	{
	int exitcode;
	if (_Py_HandleSystemExit(&exitcode)) {
	*exitcode_p = exitcode;
	return 1;
	}

	PyErr_Print();
	return 0;
	}


	static int
	pymain_exit_err_print(void)
	{
	int exitcode = 1;
	pymain_err_print(&exitcode);
	return exitcode;
	}


	/* Write an exitcode into *exitcode and return 1 if we have to exit Python.
	Return 0 otherwise. */
	static int
	pymain_get_importer(const wchar_t filename, PyObject importer_p, int exitcode)
	{
	PyObject sys_path0 = NULL, importer;

	sys_path0 = PyUnicode_FromWideChar(filename, wcslen(filename));
	if (sys_path0 == NULL) {
	goto error;
	}

	importer = PyImport_GetImporter(sys_path0);
	if (importer == NULL) {
	goto error;
	}

	if (importer == Py_None) {
	Py_DECREF(sys_path0);
	Py_DECREF(importer);
	return 0;
	}

	Py_DECREF(importer);
	*importer_p = sys_path0;
	return 0;

	error:
	Py_XDECREF(sys_path0);

	PySys_WriteStderr("Failed checking if argv[0] is an import path entry\n");
	return pymain_err_print(exitcode);
	}


	static int
	pymain_sys_path_add_path0(PyInterpreterState interp, PyObject path0)
	{
	_Py_IDENTIFIER(path);
	PyObject *sys_path;
	PyObject *sysdict = interp->sysdict;
	if (sysdict != NULL) {
	sys_path = _PyDict_GetItemIdWithError(sysdict, &PyId_path);
	if (sys_path == NULL && PyErr_Occurred()) {
	return -1;
	}
	}
	else {
	sys_path = NULL;
	}
	if (sys_path == NULL) {
	PyErr_SetString(PyExc_RuntimeError, "unable to get sys.path");
	return -1;
	}

	if (PyList_Insert(sys_path, 0, path0)) {
	return -1;
	}
	return 0;
	}


	static void
	pymain_header(const PyConfig *config)
	{
	if (config->quiet) {
	return;
	}

	if (!config->verbose && (config_run_code(config) \|\| !stdin_is_interactive(config))) {
	return;
	}

	fprintf(stderr, "Python %s on %s\n", Py_GetVersion(), Py_GetPlatform());
	if (config->site_import) {
	fprintf(stderr, "%s\n", COPYRIGHT);
	}
	}


	static void
	pymain_import_readline(const PyConfig *config)
	{
	if (config->isolated) {
	return;
	}
	if (!config->inspect && config_run_code(config)) {
	return;
	}
	if (!isatty(fileno(stdin))) {
	return;
	}

	PyObject *mod = PyImport_ImportModule("readline");
	if (mod == NULL) {
	PyErr_Clear();
	}
	else {
	Py_DECREF(mod);
	}
	}


	static int
	pymain_run_command(wchar_t command, PyCompilerFlags cf)
	{
	PyObject unicode, bytes;
	int ret;

	unicode = PyUnicode_FromWideChar(command, -1);
	if (unicode == NULL) {
	goto error;
	}

	if (PySys_Audit("cpython.run_command", "O", unicode) < 0) {
	return pymain_exit_err_print();
	}

	bytes = PyUnicode_AsUTF8String(unicode);
	Py_DECREF(unicode);
	if (bytes == NULL) {
	goto error;
	}

	ret = PyRun_SimpleStringFlags(PyBytes_AsString(bytes), cf);
	Py_DECREF(bytes);
	return (ret != 0);

	error:
	PySys_WriteStderr("Unable to decode the command from the command line:\n");
	return pymain_exit_err_print();
	}


	static int
	pymain_run_module(const wchar_t *modname, int set_argv0)
	{
	PyObject module, runpy, runmodule, runargs, *result;
	if (PySys_Audit("cpython.run_module", "u", modname) < 0) {
	return pymain_exit_err_print();
	}
	runpy = PyImport_ImportModule("runpy");
	if (runpy == NULL) {
	fprintf(stderr, "Could not import runpy module\n");
	return pymain_exit_err_print();
	}
	runmodule = PyObject_GetAttrString(runpy, "_run_module_as_main");
	if (runmodule == NULL) {
	fprintf(stderr, "Could not access runpy._run_module_as_main\n");
	Py_DECREF(runpy);
	return pymain_exit_err_print();
	}
	module = PyUnicode_FromWideChar(modname, wcslen(modname));
	if (module == NULL) {
	fprintf(stderr, "Could not convert module name to unicode\n");
	Py_DECREF(runpy);
	Py_DECREF(runmodule);
	return pymain_exit_err_print();
	}
	runargs = Py_BuildValue("(Oi)", module, set_argv0);
	if (runargs == NULL) {
	fprintf(stderr,
	"Could not create arguments for runpy._run_module_as_main\n");
	Py_DECREF(runpy);
	Py_DECREF(runmodule);
	Py_DECREF(module);
	return pymain_exit_err_print();
	}
	result = PyObject_Call(runmodule, runargs, NULL);
	Py_DECREF(runpy);
	Py_DECREF(runmodule);
	Py_DECREF(module);
	Py_DECREF(runargs);
	if (result == NULL) {
	return pymain_exit_err_print();
	}
	Py_DECREF(result);
	return 0;
	}


	static int
	pymain_run_file(PyConfig config, PyCompilerFlags cf)
	{
	const wchar_t *filename = config->run_filename;
	if (PySys_Audit("cpython.run_file", "u", filename) < 0) {
	return pymain_exit_err_print();
	}
	FILE *fp = _Py_wfopen(filename, L"rb");
	if (fp == NULL) {
	char *cfilename_buffer;
	const char *cfilename;
	int err = errno;
	cfilename_buffer = _Py_EncodeLocaleRaw(filename, NULL);
	if (cfilename_buffer != NULL)
	cfilename = cfilename_buffer;
	else
	cfilename = "<unprintable file name>";
	fprintf(stderr, "%ls: can't open file '%s': [Errno %d] %s\n",
	config->program_name, cfilename, err, strerror(err));
	PyMem_RawFree(cfilename_buffer);
	return 2;
	}

	if (config->skip_source_first_line) {
	int ch;
	/* Push back first newline so line numbers remain the same */
	while ((ch = getc(fp)) != EOF) {
	if (ch == '\n') {
	(void)ungetc(ch, fp);
	break;
	}
	}
	}

	struct _Py_stat_struct sb;
	if (_Py_fstat_noraise(fileno(fp), &sb) == 0 && S_ISDIR(sb.st_mode)) {
	fprintf(stderr,
	"%ls: '%ls' is a directory, cannot continue\n",
	config->program_name, filename);
	fclose(fp);
	return 1;
	}

	/* call pending calls like signal handlers (SIGINT) */
	if (Py_MakePendingCalls() == -1) {
	fclose(fp);
	return pymain_exit_err_print();
	}

	PyObject unicode, bytes = NULL;
	const char *filename_str;

	unicode = PyUnicode_FromWideChar(filename, wcslen(filename));
	if (unicode != NULL) {
	bytes = PyUnicode_EncodeFSDefault(unicode);
	Py_DECREF(unicode);
	}
	if (bytes != NULL) {
	filename_str = PyBytes_AsString(bytes);
	}
	else {
	PyErr_Clear();
	filename_str = "<filename encoding error>";
	}

	/* PyRun_AnyFileExFlags(closeit=1) calls fclose(fp) before running code */
	int run = PyRun_AnyFileExFlags(fp, filename_str, 1, cf);
	Py_XDECREF(bytes);
	return (run != 0);
	}


	static int
	pymain_run_startup(PyConfig config, PyCompilerFlags cf, int *exitcode)
	{
	const char *startup = _Py_GetEnv(config->use_environment, "PYTHONSTARTUP");
	if (startup == NULL) {
	return 0;
	}
	if (PySys_Audit("cpython.run_startup", "s", startup) < 0) {
	return pymain_err_print(exitcode);
	}

	FILE *fp = _Py_fopen(startup, "r");
	if (fp == NULL) {
	int save_errno = errno;
	PySys_WriteStderr("Could not open PYTHONSTARTUP\n");

	errno = save_errno;
	PyErr_SetFromErrnoWithFilename(PyExc_OSError, startup);

	return pymain_err_print(exitcode);
	}

	(void) PyRun_SimpleFileExFlags(fp, startup, 0, cf);
	PyErr_Clear();
	fclose(fp);
	return 0;
	}


	/* Write an exitcode into *exitcode and return 1 if we have to exit Python.
	Return 0 otherwise. */
	static int
	pymain_run_interactive_hook(int *exitcode)
	{
	PyObject sys, hook, *result;
	sys = PyImport_ImportModule("sys");
	if (sys == NULL) {
	goto error;
	}

	hook = PyObject_GetAttrString(sys, "__interactivehook__");
	Py_DECREF(sys);
	if (hook == NULL) {
	PyErr_Clear();
	return 0;
	}

	if (PySys_Audit("cpython.run_interactivehook", "O", hook) < 0) {
	goto error;
	}

	result = _PyObject_CallNoArg(hook);
	Py_DECREF(hook);
	if (result == NULL) {
	goto error;
	}
	Py_DECREF(result);

	return 0;

	error:
	PySys_WriteStderr("Failed calling sys.__interactivehook__\n");
	return pymain_err_print(exitcode);
	}


	static int
	pymain_run_stdin(PyConfig config, PyCompilerFlags cf)
	{
	if (stdin_is_interactive(config)) {
	config->inspect = 0;
	Py_InspectFlag = 0; /* do exit on SystemExit */

	int exitcode;
	if (pymain_run_startup(config, cf, &exitcode)) {
	return exitcode;
	}

	if (pymain_run_interactive_hook(&exitcode)) {
	return exitcode;
	}
	}

	/* call pending calls like signal handlers (SIGINT) */
	if (Py_MakePendingCalls() == -1) {
	return pymain_exit_err_print();
	}

	if (PySys_Audit("cpython.run_stdin", NULL) < 0) {
	return pymain_exit_err_print();
	}

	int run = PyRun_AnyFileExFlags(stdin, "<stdin>", 0, cf);
	return (run != 0);
	}


	static void
	pymain_repl(PyConfig config, PyCompilerFlags cf, int *exitcode)
	{
	/* Check this environment variable at the end, to give programs the
	opportunity to set it from Python. */
	if (!config->inspect && _Py_GetEnv(config->use_environment, "PYTHONINSPECT")) {
	config->inspect = 1;
	Py_InspectFlag = 1;
	}

	if (!(config->inspect && stdin_is_interactive(config) && config_run_code(config))) {
	return;
	}

	config->inspect = 0;
	Py_InspectFlag = 0;
	if (pymain_run_interactive_hook(exitcode)) {
	return;
	}

	int res = PyRun_AnyFileFlags(stdin, "<stdin>", cf);
	*exitcode = (res != 0);
	}


	static void
	pymain_run_python(int *exitcode)
	{
	PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE();
	/* pymain_run_stdin() modify the config */
	PyConfig *config = &interp->config;

	PyObject *main_importer_path = NULL;
	if (config->run_filename != NULL) {
	/* If filename is a package (ex: directory or ZIP file) which contains
	__main__.py, main_importer_path is set to filename and will be
	prepended to sys.path.

	Otherwise, main_importer_path is left unchanged. */
	if (pymain_get_importer(config->run_filename, &main_importer_path,
	exitcode)) {
	return;
	}
	}

	if (main_importer_path != NULL) {
	if (pymain_sys_path_add_path0(interp, main_importer_path) < 0) {
	goto error;
	}
	}
	else if (!config->isolated) {
	PyObject *path0 = NULL;
	int res = _PyPathConfig_ComputeSysPath0(&config->argv, &path0);
	if (res < 0) {
	goto error;
	}

	if (res > 0) {
	if (pymain_sys_path_add_path0(interp, path0) < 0) {
	Py_DECREF(path0);
	goto error;
	}
	Py_DECREF(path0);
	}
	}

	PyCompilerFlags cf = _PyCompilerFlags_INIT;

	pymain_header(config);
	pymain_import_readline(config);

	if (config->run_command) {
	*exitcode = pymain_run_command(config->run_command, &cf);
	}
	else if (config->run_module) {
	*exitcode = pymain_run_module(config->run_module, 1);
	}
	else if (main_importer_path != NULL) {
	*exitcode = pymain_run_module(L"__main__", 0);
	}
	else if (config->run_filename != NULL) {
	*exitcode = pymain_run_file(config, &cf);
	}
	else {
	*exitcode = pymain_run_stdin(config, &cf);
	}

	pymain_repl(config, &cf, exitcode);
	goto done;

	error:
	*exitcode = pymain_exit_err_print();

	done:
	Py_XDECREF(main_importer_path);
	}


	/* --- pymain_main() ---------------------------------------------- */

	static void
	pymain_free(void)
	{
	_PyImport_Fini2();

	/* Free global variables which cannot be freed in Py_Finalize():
	configuration options set before Py_Initialize() which should
	remain valid after Py_Finalize(), since
	Py_Initialize()-Py_Finalize() can be called multiple times. */
	_PyPathConfig_ClearGlobal();
	_Py_ClearStandardStreamEncoding();
	_Py_ClearArgcArgv();
	_PyRuntime_Finalize();
	}


	static int
	exit_sigint(void)
	{
	/* bpo-1054041: We need to exit via the
	* SIG_DFL handler for SIGINT if KeyboardInterrupt went unhandled.
	* If we don't, a calling process such as a shell may not know
	* about the user's ^C. https://www.cons.org/cracauer/sigint.html */
	#if defined(HAVE_GETPID) && !defined(MS_WINDOWS)
	if (PyOS_setsig(SIGINT, SIG_DFL) == SIG_ERR) {
	perror("signal"); /* Impossible in normal environments. */
	} else {
	kill(getpid(), SIGINT);
	}
	/* If setting SIG_DFL failed, or kill failed to terminate us,
	* there isn't much else we can do aside from an error code. */
	#endif /* HAVE_GETPID && !MS_WINDOWS */
	#ifdef MS_WINDOWS
	/* cmd.exe detects this, prints ^C, and offers to terminate. */
	/* https://msdn.microsoft.com/en-us/library/cc704588.aspx */
	return STATUS_CONTROL_C_EXIT;
	#else
	return SIGINT + 128;
	#endif /* !MS_WINDOWS */
	}


	static void _Py_NO_RETURN
	pymain_exit_error(PyStatus status)
	{
	if (_PyStatus_IS_EXIT(status)) {
	/* If it's an error rather than a regular exit, leave Python runtime
	alive: Py_ExitStatusException() uses the current exception and use
	sys.stdout in this case. */
	pymain_free();
	}
	Py_ExitStatusException(status);
	}


	int
	Py_RunMain(void)
	{
	int exitcode = 0;

	pymain_run_python(&exitcode);

	if (Py_FinalizeEx() < 0) {
	/* Value unlikely to be confused with a non-error exit status or
	other special meaning */
	exitcode = 120;
	}

	pymain_free();

	if (_Py_UnhandledKeyboardInterrupt) {
	exitcode = exit_sigint();
	}

	return exitcode;
	}


	static int
	pymain_main(_PyArgv *args)
	{
	PyStatus status = pymain_init(args);
	if (_PyStatus_IS_EXIT(status)) {
	pymain_free();
	return status.exitcode;
	}
	if (_PyStatus_EXCEPTION(status)) {
	pymain_exit_error(status);
	}

	return Py_RunMain();
	}


	int
	Py_Main(int argc, wchar_t **argv)
	{
	_PyArgv args = {
	.argc = argc,
	.use_bytes_argv = 0,
	.bytes_argv = NULL,
	.wchar_argv = argv};
	return pymain_main(&args);
	}


	int
	Py_BytesMain(int argc, char **argv)
	{
	_PyArgv args = {
	.argc = argc,
	.use_bytes_argv = 1,
	.bytes_argv = argv,
	.wchar_argv = NULL};
	return pymain_main(&args);
	}

	#ifdef __cplusplus
	}
	#endif