#include "Python.h"

#include "pycore_call.h" // _PyObject_CallNoArgs()

#include "pycore_fileutils.h" // struct _Py_stat_struct

#include "pycore_import.h" // _PyImport_Fini2()

#include "pycore_initconfig.h" // _PyArgv

#include "pycore_interp.h" // _PyInterpreterState.sysdict

#include "pycore_long.h" // _PyLong_GetOne()

#include "pycore_pathconfig.h" // _PyPathConfig_ComputeSysPath0()

#include "pycore_pylifecycle.h" // _Py_PreInitializeFromPyArgv()

#include "pycore_pystate.h" // _PyInterpreterState_GET()

#include "pycore_pythonrun.h" // _PyRun_AnyFile()

#include "pycore_sysmodule.h" // _PySys_FormatV()

#include "pycore_tuple.h" // _PyTuple_FromPair

#include "pycore_unicodeobject.h" // _PyUnicode_Dedent()

#include <stdio.h> // perror()

#ifdef HAVE_SIGNAL_H

# include <signal.h> // SIGINT

#if defined(HAVE_GETPID) && defined(HAVE_UNISTD_H)

# include <unistd.h> // getpid()

#ifdef MS_WINDOWS

# include <windows.h> // STATUS_CONTROL_C_EXIT

#define COPYRIGHT \

"Type \"help\", \"copyright\", \"credits\" or \"license\" " \

"for more information."

static PyStatus

pymain_init(const _PyArgv *args)

{

PyStatus status;

status = _PyRuntime_Initialize();

if (_PyStatus_EXCEPTION(status)) {

return status;

}

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,

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;

}

static void

pymain_error_format(const char *format, ...)

{

va_list vargs;

va_start(vargs, format);

PySys_WriteStderr("python: ");

_PySys_FormatV(&_Py_ID(stderr), stderr, format, vargs);

PySys_WriteStderr("\n");

va_end(vargs);

}

static void

pymain_error(const char *msg)

{

PySys_FormatStderr("python: %s\n", msg);

}

static int

pymain_check_signals(void)

{

return Py_MakePendingCalls();

}

static inline int config_run_code(const PyConfig *config)

{

return (config->run_command != NULL

|| config->run_filename != NULL

|| config->run_module != NULL);

}

static int

stdin_is_interactive(const PyConfig *config)

{

return (isatty(fileno(stdin)) || config->interactive);

}

static int

pymain_err_print(int *exitcode_p)

{

int exitcode;

if (_Py_HandleSystemExitAndKeyboardInterrupt(&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;

}

static int

pymain_get_importer(const PyConfig *config, PyObject **importer_p,

int *exitcode)

{

const wchar_t *filename = config->run_filename;

if (filename == NULL) {

return 0;

}

PyObject *sys_path0 = PyUnicode_FromWideChar(filename, -1);

if (sys_path0 == NULL) {

goto error;

}

PyObject *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);

pymain_error("Failed checking if argv[0] is an import path entry:");

return pymain_err_print(exitcode);

}

static int

pymain_sys_path_add_path0(PyObject *path0)

{

PyObject *sys_path;

PyInterpreterState *interp = _PyInterpreterState_GET();

PyObject *sysdict = interp->sysdict;

if (sysdict != NULL) {

sys_path = PyDict_GetItemWithError(sysdict, &_Py_ID(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 (PyDict_SetItemString(sysdict, "_path0", path0) < 0) {

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 int

pymain_import_readline(const PyConfig *config)

{

if (pymain_check_signals() < 0) {

return -1;

}

if (config->isolated) {

return 0;

}

if (!config->inspect && config_run_code(config)) {

return 0;

}

if (!isatty(fileno(stdin))) {

return 0;

}

PyObject *mod = PyImport_ImportModule("readline");

if (mod == NULL) {

PyErr_Clear();

}

else {

Py_DECREF(mod);

}

mod = PyImport_ImportModule("rlcompleter");

if (mod == NULL) {

PyErr_Clear();

}

else {

Py_DECREF(mod);

}

return 0;

}

static int

pymain_run_command(wchar_t *command)

{

PyObject *unicode, *bytes;

unicode = PyUnicode_FromWideChar(command, -1);

if (unicode == NULL) {

goto error;

}

if (PySys_Audit("cpython.run_command", "O", unicode) < 0) {

Py_DECREF(unicode);

return pymain_exit_err_print();

}

Py_SETREF(unicode, _PyUnicode_Dedent(unicode));

if (unicode == NULL) {

goto error;

}

bytes = PyUnicode_AsUTF8String(unicode);

Py_DECREF(unicode);

if (bytes == NULL) {

goto error;

}

PyCompilerFlags cf = _PyCompilerFlags_INIT;

cf.cf_flags |= PyCF_IGNORE_COOKIE;

PyObject *result = NULL;

PyObject *string_obj = PyUnicode_FromString("<string>");

if (string_obj != NULL) {

result = _PyRun_SimpleString(PyBytes_AsString(bytes),

string_obj, &cf);

Py_DECREF(string_obj);

}

Py_DECREF(bytes);

if (result == NULL) {

return pymain_exit_err_print();

}

return 0;

error:

pymain_error("Unable to decode the command from the command line:");

return pymain_exit_err_print();

}

static int

pymain_run_pyrepl(int pythonstartup)

{

int exitcode = 0;

PyObject *console = NULL;

PyObject *empty_tuple = NULL;

PyObject *kwargs = NULL;

PyObject *console_result = NULL;

PyObject *main_module = NULL;

PyObject *pyrepl = PyImport_ImportModule("_pyrepl.main");

if (pyrepl == NULL) {

pymain_error("Could not import _pyrepl.main");

goto error;

}

console = PyObject_GetAttrString(pyrepl, "interactive_console");

if (console == NULL) {

pymain_error("Could not access _pyrepl.main.interactive_console");

goto error;

}

empty_tuple = PyTuple_New(0);

if (empty_tuple == NULL) {

goto error;

}

kwargs = PyDict_New();

if (kwargs == NULL) {

goto error;

}

main_module = PyImport_AddModuleRef("__main__");

if (main_module == NULL) {

goto error;

}

PyObject *value = pythonstartup ? Py_True : Py_False;

if (PyDict_SetItemString(kwargs, "mainmodule", main_module)

|| PyDict_SetItemString(kwargs, "pythonstartup", value))

{

goto error;

}

console_result = PyObject_Call(console, empty_tuple, kwargs);

if (console_result == NULL) {

goto error;

}

done:

Py_XDECREF(console_result);

Py_XDECREF(kwargs);

Py_XDECREF(empty_tuple);

Py_XDECREF(console);

Py_XDECREF(pyrepl);

Py_XDECREF(main_module);

return exitcode;

error:

exitcode = pymain_exit_err_print();

goto done;

}

static int

pymain_run_module(const wchar_t *modname, int set_argv0)

{

int exitcode = 0;

PyObject *module = NULL;

PyObject *runmodule = NULL;

PyObject *runargs = NULL;

PyObject *result = NULL;

if (PySys_Audit("cpython.run_module", "u", modname) < 0) {

goto error;

}

runmodule = PyImport_ImportModuleAttrString("runpy",

"_run_module_as_main");

if (runmodule == NULL) {

pymain_error("Could not import runpy._run_module_as_main");

goto error;

}

module = PyUnicode_FromWideChar(modname, -1);

if (module == NULL) {

pymain_error("Could not convert module name to unicode");

goto error;

}

runargs = _PyTuple_FromPair(module, set_argv0 ? Py_True : Py_False);

if (runargs == NULL) {

pymain_error("Could not create arguments "

"for runpy._run_module_as_main");

goto error;

}

result = PyObject_Call(runmodule, runargs, NULL);

if (result == NULL) {

goto error;

}

done:

Py_XDECREF(module);

Py_XDECREF(runmodule);

Py_XDECREF(runargs);

Py_XDECREF(result);

return exitcode;

error:

exitcode = pymain_exit_err_print();

goto done;

}

static int

pymain_run_file_obj(PyObject *filename, int skip_source_first_line)

{

if (PySys_Audit("cpython.run_file", "O", filename) < 0) {

return pymain_exit_err_print();

}

FILE *fp = Py_fopen(filename, "rb");

if (fp == NULL) {

pymain_error_format("can't open file %R:", filename);

pymain_exit_err_print();

return 2;

}

if (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)) {

pymain_error_format("%R is a directory, cannot continue",

filename);

fclose(fp);

return 1;

}

if (pymain_check_signals() < 0) {

fclose(fp);

return pymain_exit_err_print();

}

/* _PyRun_AnyFile(closeit=1) calls fclose(fp) before running code */

PyCompilerFlags cf = _PyCompilerFlags_INIT;

PyObject *result = _PyRun_AnyFile(fp, filename, 1, &cf);

if (result == NULL) {

return pymain_exit_err_print();

}

Py_DECREF(result);

return 0;

}

static int

pymain_run_file(const PyConfig *config)

{

PyObject *filename = PyUnicode_FromWideChar(config->run_filename, -1);

if (filename == NULL) {

return pymain_exit_err_print();

}

int exitcode = pymain_run_file_obj(filename, config->skip_source_first_line);

Py_XDECREF(filename);

return exitcode;

}

static int

pymain_run_startup(PyConfig *config, int *exitcode)

{

int ret = 0;

PyObject *startup = NULL;

if (!config->use_environment) {

goto done;

}

#ifdef MS_WINDOWS

const wchar_t *env = _wgetenv(L"PYTHONSTARTUP");

if (env == NULL || env[0] == L'\0') {

goto done;

}

startup = PyUnicode_FromWideChar(env, -1);

if (startup == NULL) {

goto error;

}

const char *env = _Py_GetEnv(config->use_environment, "PYTHONSTARTUP");

if (env == NULL) {

goto done;

}

startup = PyUnicode_DecodeFSDefault(env);

if (startup == NULL) {

goto error;

}

if (PySys_Audit("cpython.run_startup", "O", startup) < 0) {

goto error;

}

FILE *fp = Py_fopen(startup, "r");

if (fp == NULL) {

pymain_error("Could not open PYTHONSTARTUP");

goto error;

}

PyCompilerFlags cf = _PyCompilerFlags_INIT;

PyObject *result = _PyRun_SimpleFile(fp, startup, 0, &cf);

fclose(fp);

if (result == NULL) {

goto error;

}

Py_DECREF(result);

done:

Py_XDECREF(startup);

return ret;

error:

ret = pymain_err_print(exitcode);

goto done;

}

static int

pymain_run_interactive_hook(int *exitcode)

{

PyObject *hook;

if (PySys_GetOptionalAttrString("__interactivehook__", &hook) < 0) {

goto error;

}

if (hook == NULL) {

return 0;

}

if (PySys_Audit("cpython.run_interactivehook", "O", hook) < 0) {

Py_DECREF(hook);

goto error;

}

PyObject *result = _PyObject_CallNoArgs(hook);

Py_DECREF(hook);

if (result == NULL) {

goto error;

}

Py_DECREF(result);

return 0;

error:

pymain_error("Failed calling sys.__interactivehook__:");

return pymain_err_print(exitcode);

}

static int

pymain_set_inspect(PyConfig *config, int inspect, int *exitcode)

{

PyObject *value = PyLong_FromLong(inspect);

if (value == NULL || PyConfig_Set("inspect", value) < 0) {

Py_XDECREF(value);

pymain_error("Could not set the inspect flag");

return pymain_err_print(exitcode);

}

else {

assert(config->inspect == inspect);

}

Py_XDECREF(value);

return 0;

}

static int

_pymain_run_repl(PyConfig *config, int startup)

{

if (pymain_check_signals() < 0) {

goto error;

}

if (PySys_Audit("cpython.run_stdin", NULL) < 0) {

goto error;

}

if (isatty(fileno(stdin))

&& !_Py_GetEnv(config->use_environment, "PYTHON_BASIC_REPL"))

{

PyObject *pyrepl = PyImport_ImportModule("_pyrepl");

if (pyrepl != NULL) {

int exitcode = pymain_run_pyrepl(startup);

Py_DECREF(pyrepl);

return exitcode;

}

if (!PyErr_ExceptionMatches(PyExc_ModuleNotFoundError)) {

pymain_error("Could not import _pyrepl.main");

goto error;

}

PyErr_Clear();

}

PyCompilerFlags cf = _PyCompilerFlags_INIT;

PyObject *result = NULL;

PyObject *stdin_obj = PyUnicode_FromString("<stdin>");

if (stdin_obj != NULL) {

result = _PyRun_AnyFile(stdin, stdin_obj, 0, &cf);

Py_DECREF(stdin_obj);

}

if (result == NULL) {

goto error;

}

Py_DECREF(result);

return 0;

error:

return pymain_exit_err_print();

}

static int

pymain_run_stdin(PyConfig *config)

{

if (stdin_is_interactive(config)) {

// do exit on SystemExit

int exitcode;

if (pymain_set_inspect(config, 0, &exitcode)) {

return exitcode;

}

if (pymain_run_startup(config, &exitcode)) {

return exitcode;

}

if (pymain_run_interactive_hook(&exitcode)) {

return exitcode;

}

}

return _pymain_run_repl(config, 0);

}

static void

pymain_repl(PyConfig *config, int *exitcode)

{

/* Check this environment variable at the end, to give programs the

if (!config->inspect && _Py_GetEnv(config->use_environment, "PYTHONINSPECT")) {

if (pymain_set_inspect(config, 1, exitcode)) {

return;

}

}

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

return;

}

if (pymain_set_inspect(config, 0, exitcode)) {

return;

}

if (pymain_run_interactive_hook(exitcode)) {

return;

}

*exitcode = _pymain_run_repl(config, 1);

}

static int

pymain_set_path0(PyObject *main_importer_path)

{

PyConfig *config = (PyConfig *)_Py_GetConfig();

PyObject *path0 = NULL;

if (main_importer_path != NULL) {

path0 = Py_NewRef(main_importer_path);

}

else if (!config->safe_path) {

int res = _PyPathConfig_ComputeSysPath0(&config->argv, &path0);

if (res < 0) {

return -1;

}

else if (res == 0) {

Py_CLEAR(path0);

}

}

if (path0 == NULL) {

return 0;

}

// XXX Apply config->sys_path_0 in init_interp_main(). We have

// to be sure to get readline/rlcompleter imported at the correct time.

wchar_t *wstr = PyUnicode_AsWideCharString(path0, NULL);

if (wstr == NULL) {

goto error;

}

PyStatus status = PyConfig_SetString(config, &config->sys_path_0, wstr);

PyMem_Free(wstr);

if (_PyStatus_EXCEPTION(status)) {

_PyErr_SetFromPyStatus(status);

goto error;

}

int res = pymain_sys_path_add_path0(path0);

Py_DECREF(path0);

return res;

error:

Py_DECREF(path0);

return -1;

}

static void

pymain_run_python(int *exitcode)

{

PyInterpreterState *interp = _PyInterpreterState_GET();

/* pymain_repl() and pymain_run_stdin() modify the config */

PyConfig *config = (PyConfig*)_PyInterpreterState_GetConfig(interp);

// Process command line options which want to exit Python

int cmdline_exitcode = _PyConfig_ProcessDeferredCmdlineOption(config);

if (cmdline_exitcode >= 0) {

*exitcode = cmdline_exitcode;

return;

}

int set_running_main = 0;

PyObject *main_importer_path = NULL;

/* ensure path config is written into global variables */

PyStatus status = _PyPathConfig_UpdateGlobal(config);

if (_PyStatus_EXCEPTION(status)) {

_PyErr_SetFromPyStatus(status);

goto error;

}

// XXX Calculate config->sys_path_0 in getpath.py.

// The tricky part is that we can't check the path importers yet

// at that point.

assert(config->sys_path_0 == NULL);

if (pymain_get_importer(config, &main_importer_path, exitcode)) {

return;

}

// import readline and rlcompleter before script dir is added to sys.path

if (pymain_import_readline(config) < 0) {

goto error;

}

if (pymain_set_path0(main_importer_path) < 0) {

goto error;

}

pymain_header(config);

_PyInterpreterState_SetRunningMain(interp);

set_running_main = 1;

assert(!PyErr_Occurred());

if (pymain_check_signals() < 0) {

goto error;

}

if (config->run_command) {

*exitcode = pymain_run_command(config->run_command);

}

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);

}

else {

*exitcode = pymain_run_stdin(config);

}

if (pymain_check_signals() < 0) {

goto error;

}

pymain_repl(config, exitcode);

goto done;

error:

*exitcode = pymain_exit_err_print();

done:

if (set_running_main) {

_PyInterpreterState_SetNotRunningMain(interp);

}

Py_XDECREF(main_importer_path);

}

static void

pymain_free(void)

{

_PyImport_Fini2();

/* Free global variables which cannot be freed in Py_Finalize():

_PyPathConfig_ClearGlobal();

_Py_ClearArgcArgv();

_PyRuntime_Finalize();

}

static int

exit_sigint(void)

{

/* bpo-1054041: We need to exit via the

#if defined(HAVE_GETPID) && defined(HAVE_KILL) && !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,

#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;

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

pymain_free();

}

Py_ExitStatusException(status);

}

Py_RunMain(void)

{

int exitcode = 0;

_PyRuntime.signals.unhandled_keyboard_interrupt = 0;

pymain_run_python(&exitcode);

if (Py_FinalizeEx() < 0) {

/* Value unlikely to be confused with a non-error exit status or

exitcode = 120;

}

pymain_free();

if (_PyRuntime.signals.unhandled_keyboard_interrupt) {

exitcode = exit_sigint();

}

return exitcode;

}

static int

pymain_main(_PyArgv *args)

{

PyStatus status = pymain_init(args);

assert(!_PyStatus_IS_EXIT(status));

if (_PyStatus_EXCEPTION(status)) {

pymain_exit_error(status);

}

return Py_RunMain();

}

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);

}

Py_BytesMain(int argc, char **argv)

{

_PyArgv args = {

.argc = argc,

.use_bytes_argv = 1,

.bytes_argv = argv,

.wchar_argv = NULL};

return pymain_main(&args);

}