mirror of
https://github.com/python/cpython.git
synced 2025-11-04 03:44:55 +00:00
d943d19172
* Move _PyObject_CallNoArgs() to pycore_call.h (internal C API). * _ssl, _sqlite and _testcapi extensions now call the public PyObject_CallNoArgs() function, rather than _PyObject_CallNoArgs(). * _lsprof extension is now built with Py_BUILD_CORE_MODULE macro defined to get access to internal _PyObject_CallNoArgs().
726 lines
18 KiB
C
726 lines
18 KiB
C
/* Python interpreter main program */
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#include "Python.h"
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#include "pycore_call.h" // _PyObject_CallNoArgs()
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#include "pycore_initconfig.h" // _PyArgv
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#include "pycore_interp.h" // _PyInterpreterState.sysdict
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#include "pycore_pathconfig.h" // _PyPathConfig_ComputeSysPath0()
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#include "pycore_pylifecycle.h" // _Py_PreInitializeFromPyArgv()
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#include "pycore_pystate.h" // _PyInterpreterState_GET()
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/* Includes for exit_sigint() */
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#include <stdio.h> // perror()
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#ifdef HAVE_SIGNAL_H
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# include <signal.h> // SIGINT
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#endif
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#if defined(HAVE_GETPID) && defined(HAVE_UNISTD_H)
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# include <unistd.h> // getpid()
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#endif
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#ifdef MS_WINDOWS
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# include <windows.h> // STATUS_CONTROL_C_EXIT
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#endif
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/* End of includes for exit_sigint() */
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#define COPYRIGHT \
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"Type \"help\", \"copyright\", \"credits\" or \"license\" " \
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"for more information."
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* --- pymain_init() ---------------------------------------------- */
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static PyStatus
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pymain_init(const _PyArgv *args)
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{
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PyStatus status;
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status = _PyRuntime_Initialize();
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if (_PyStatus_EXCEPTION(status)) {
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return status;
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}
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PyPreConfig preconfig;
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PyPreConfig_InitPythonConfig(&preconfig);
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status = _Py_PreInitializeFromPyArgv(&preconfig, args);
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if (_PyStatus_EXCEPTION(status)) {
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return status;
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}
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PyConfig config;
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PyConfig_InitPythonConfig(&config);
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/* pass NULL as the config: config is read from command line arguments,
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environment variables, configuration files */
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if (args->use_bytes_argv) {
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status = PyConfig_SetBytesArgv(&config, args->argc, args->bytes_argv);
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}
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else {
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status = PyConfig_SetArgv(&config, args->argc, args->wchar_argv);
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}
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if (_PyStatus_EXCEPTION(status)) {
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goto done;
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}
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status = Py_InitializeFromConfig(&config);
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if (_PyStatus_EXCEPTION(status)) {
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goto done;
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}
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status = _PyStatus_OK();
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done:
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PyConfig_Clear(&config);
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return status;
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}
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/* --- pymain_run_python() ---------------------------------------- */
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/* Non-zero if filename, command (-c) or module (-m) is set
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on the command line */
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static inline int config_run_code(const PyConfig *config)
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{
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return (config->run_command != NULL
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|| config->run_filename != NULL
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|| config->run_module != NULL);
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}
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/* Return non-zero if stdin is a TTY or if -i command line option is used */
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static int
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stdin_is_interactive(const PyConfig *config)
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{
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return (isatty(fileno(stdin)) || config->interactive);
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}
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/* Display the current Python exception and return an exitcode */
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static int
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pymain_err_print(int *exitcode_p)
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{
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int exitcode;
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if (_Py_HandleSystemExit(&exitcode)) {
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*exitcode_p = exitcode;
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return 1;
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}
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PyErr_Print();
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return 0;
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}
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static int
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pymain_exit_err_print(void)
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{
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int exitcode = 1;
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pymain_err_print(&exitcode);
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return exitcode;
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}
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/* Write an exitcode into *exitcode and return 1 if we have to exit Python.
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Return 0 otherwise. */
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static int
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pymain_get_importer(const wchar_t *filename, PyObject **importer_p, int *exitcode)
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{
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PyObject *sys_path0 = NULL, *importer;
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sys_path0 = PyUnicode_FromWideChar(filename, wcslen(filename));
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if (sys_path0 == NULL) {
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goto error;
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}
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importer = PyImport_GetImporter(sys_path0);
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if (importer == NULL) {
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goto error;
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}
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if (importer == Py_None) {
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Py_DECREF(sys_path0);
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Py_DECREF(importer);
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return 0;
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}
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Py_DECREF(importer);
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*importer_p = sys_path0;
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return 0;
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error:
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Py_XDECREF(sys_path0);
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PySys_WriteStderr("Failed checking if argv[0] is an import path entry\n");
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return pymain_err_print(exitcode);
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}
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static int
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pymain_sys_path_add_path0(PyInterpreterState *interp, PyObject *path0)
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{
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_Py_IDENTIFIER(path);
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PyObject *sys_path;
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PyObject *sysdict = interp->sysdict;
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if (sysdict != NULL) {
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sys_path = _PyDict_GetItemIdWithError(sysdict, &PyId_path);
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if (sys_path == NULL && PyErr_Occurred()) {
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return -1;
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}
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}
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else {
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sys_path = NULL;
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}
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if (sys_path == NULL) {
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PyErr_SetString(PyExc_RuntimeError, "unable to get sys.path");
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return -1;
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}
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if (PyList_Insert(sys_path, 0, path0)) {
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return -1;
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}
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return 0;
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}
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static void
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pymain_header(const PyConfig *config)
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{
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if (config->quiet) {
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return;
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}
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if (!config->verbose && (config_run_code(config) || !stdin_is_interactive(config))) {
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return;
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}
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fprintf(stderr, "Python %s on %s\n", Py_GetVersion(), Py_GetPlatform());
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if (config->site_import) {
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fprintf(stderr, "%s\n", COPYRIGHT);
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}
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}
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static void
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pymain_import_readline(const PyConfig *config)
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{
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if (config->isolated) {
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return;
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}
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if (!config->inspect && config_run_code(config)) {
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return;
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}
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if (!isatty(fileno(stdin))) {
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return;
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}
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PyObject *mod = PyImport_ImportModule("readline");
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if (mod == NULL) {
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PyErr_Clear();
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}
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else {
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Py_DECREF(mod);
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}
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}
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static int
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pymain_run_command(wchar_t *command)
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{
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PyObject *unicode, *bytes;
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int ret;
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unicode = PyUnicode_FromWideChar(command, -1);
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if (unicode == NULL) {
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goto error;
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}
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if (PySys_Audit("cpython.run_command", "O", unicode) < 0) {
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return pymain_exit_err_print();
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}
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bytes = PyUnicode_AsUTF8String(unicode);
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Py_DECREF(unicode);
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if (bytes == NULL) {
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goto error;
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}
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PyCompilerFlags cf = _PyCompilerFlags_INIT;
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cf.cf_flags |= PyCF_IGNORE_COOKIE;
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ret = PyRun_SimpleStringFlags(PyBytes_AsString(bytes), &cf);
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Py_DECREF(bytes);
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return (ret != 0);
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error:
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PySys_WriteStderr("Unable to decode the command from the command line:\n");
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return pymain_exit_err_print();
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}
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static int
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pymain_run_module(const wchar_t *modname, int set_argv0)
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{
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PyObject *module, *runpy, *runmodule, *runargs, *result;
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if (PySys_Audit("cpython.run_module", "u", modname) < 0) {
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return pymain_exit_err_print();
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}
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runpy = PyImport_ImportModule("runpy");
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if (runpy == NULL) {
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fprintf(stderr, "Could not import runpy module\n");
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return pymain_exit_err_print();
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}
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runmodule = PyObject_GetAttrString(runpy, "_run_module_as_main");
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if (runmodule == NULL) {
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fprintf(stderr, "Could not access runpy._run_module_as_main\n");
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Py_DECREF(runpy);
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return pymain_exit_err_print();
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}
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module = PyUnicode_FromWideChar(modname, wcslen(modname));
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if (module == NULL) {
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fprintf(stderr, "Could not convert module name to unicode\n");
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Py_DECREF(runpy);
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Py_DECREF(runmodule);
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return pymain_exit_err_print();
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}
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runargs = PyTuple_Pack(2, module, set_argv0 ? Py_True : Py_False);
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if (runargs == NULL) {
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fprintf(stderr,
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"Could not create arguments for runpy._run_module_as_main\n");
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Py_DECREF(runpy);
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Py_DECREF(runmodule);
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Py_DECREF(module);
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return pymain_exit_err_print();
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}
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_Py_UnhandledKeyboardInterrupt = 0;
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result = PyObject_Call(runmodule, runargs, NULL);
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if (!result && PyErr_Occurred() == PyExc_KeyboardInterrupt) {
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_Py_UnhandledKeyboardInterrupt = 1;
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}
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Py_DECREF(runpy);
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Py_DECREF(runmodule);
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Py_DECREF(module);
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Py_DECREF(runargs);
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if (result == NULL) {
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return pymain_exit_err_print();
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}
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Py_DECREF(result);
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return 0;
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}
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static int
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pymain_run_file_obj(PyObject *program_name, PyObject *filename,
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int skip_source_first_line)
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{
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if (PySys_Audit("cpython.run_file", "O", filename) < 0) {
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return pymain_exit_err_print();
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}
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FILE *fp = _Py_fopen_obj(filename, "rb");
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if (fp == NULL) {
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// Ignore the OSError
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PyErr_Clear();
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PySys_FormatStderr("%S: can't open file %R: [Errno %d] %s\n",
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program_name, filename, errno, strerror(errno));
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return 2;
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}
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if (skip_source_first_line) {
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int ch;
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/* Push back first newline so line numbers remain the same */
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while ((ch = getc(fp)) != EOF) {
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if (ch == '\n') {
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(void)ungetc(ch, fp);
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break;
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}
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}
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}
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struct _Py_stat_struct sb;
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if (_Py_fstat_noraise(fileno(fp), &sb) == 0 && S_ISDIR(sb.st_mode)) {
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PySys_FormatStderr("%S: %R is a directory, cannot continue\n",
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program_name, filename);
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fclose(fp);
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return 1;
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}
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// Call pending calls like signal handlers (SIGINT)
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if (Py_MakePendingCalls() == -1) {
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fclose(fp);
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return pymain_exit_err_print();
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}
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/* PyRun_AnyFileExFlags(closeit=1) calls fclose(fp) before running code */
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PyCompilerFlags cf = _PyCompilerFlags_INIT;
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int run = _PyRun_AnyFileObject(fp, filename, 1, &cf);
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return (run != 0);
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}
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static int
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pymain_run_file(const PyConfig *config)
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{
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PyObject *filename = PyUnicode_FromWideChar(config->run_filename, -1);
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if (filename == NULL) {
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PyErr_Print();
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return -1;
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}
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PyObject *program_name = PyUnicode_FromWideChar(config->program_name, -1);
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if (program_name == NULL) {
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Py_DECREF(filename);
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PyErr_Print();
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return -1;
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}
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int res = pymain_run_file_obj(program_name, filename,
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config->skip_source_first_line);
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Py_DECREF(filename);
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Py_DECREF(program_name);
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return res;
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}
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static int
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pymain_run_startup(PyConfig *config, int *exitcode)
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{
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int ret;
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if (!config->use_environment) {
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return 0;
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}
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PyObject *startup = NULL;
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#ifdef MS_WINDOWS
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const wchar_t *env = _wgetenv(L"PYTHONSTARTUP");
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if (env == NULL || env[0] == L'\0') {
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return 0;
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}
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startup = PyUnicode_FromWideChar(env, wcslen(env));
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if (startup == NULL) {
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goto error;
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}
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#else
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const char *env = _Py_GetEnv(config->use_environment, "PYTHONSTARTUP");
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if (env == NULL) {
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return 0;
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}
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startup = PyUnicode_DecodeFSDefault(env);
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if (startup == NULL) {
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goto error;
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}
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#endif
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if (PySys_Audit("cpython.run_startup", "O", startup) < 0) {
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goto error;
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}
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FILE *fp = _Py_fopen_obj(startup, "r");
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if (fp == NULL) {
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int save_errno = errno;
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PyErr_Clear();
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PySys_WriteStderr("Could not open PYTHONSTARTUP\n");
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errno = save_errno;
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PyErr_SetFromErrnoWithFilenameObjects(PyExc_OSError, startup, NULL);
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goto error;
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}
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PyCompilerFlags cf = _PyCompilerFlags_INIT;
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(void) _PyRun_SimpleFileObject(fp, startup, 0, &cf);
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PyErr_Clear();
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fclose(fp);
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ret = 0;
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done:
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Py_XDECREF(startup);
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return ret;
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error:
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ret = pymain_err_print(exitcode);
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goto done;
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}
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/* Write an exitcode into *exitcode and return 1 if we have to exit Python.
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Return 0 otherwise. */
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static int
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pymain_run_interactive_hook(int *exitcode)
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{
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PyObject *sys, *hook, *result;
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sys = PyImport_ImportModule("sys");
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if (sys == NULL) {
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goto error;
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}
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hook = PyObject_GetAttrString(sys, "__interactivehook__");
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Py_DECREF(sys);
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if (hook == NULL) {
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PyErr_Clear();
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return 0;
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}
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if (PySys_Audit("cpython.run_interactivehook", "O", hook) < 0) {
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goto error;
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}
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result = _PyObject_CallNoArgs(hook);
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Py_DECREF(hook);
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if (result == NULL) {
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goto error;
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}
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Py_DECREF(result);
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return 0;
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|
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error:
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PySys_WriteStderr("Failed calling sys.__interactivehook__\n");
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return pymain_err_print(exitcode);
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}
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|
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|
static int
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pymain_run_stdin(PyConfig *config)
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|
{
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|
if (stdin_is_interactive(config)) {
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|
config->inspect = 0;
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Py_InspectFlag = 0; /* do exit on SystemExit */
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|
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int exitcode;
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if (pymain_run_startup(config, &exitcode)) {
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return exitcode;
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}
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|
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if (pymain_run_interactive_hook(&exitcode)) {
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return exitcode;
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}
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}
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|
|
/* call pending calls like signal handlers (SIGINT) */
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|
if (Py_MakePendingCalls() == -1) {
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|
return pymain_exit_err_print();
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}
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|
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if (PySys_Audit("cpython.run_stdin", NULL) < 0) {
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|
return pymain_exit_err_print();
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}
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|
|
PyCompilerFlags cf = _PyCompilerFlags_INIT;
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|
int run = PyRun_AnyFileExFlags(stdin, "<stdin>", 0, &cf);
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|
return (run != 0);
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|
}
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|
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|
|
static void
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|
pymain_repl(PyConfig *config, int *exitcode)
|
|
{
|
|
/* Check this environment variable at the end, to give programs the
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|
opportunity to set it from Python. */
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|
if (!config->inspect && _Py_GetEnv(config->use_environment, "PYTHONINSPECT")) {
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config->inspect = 1;
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|
Py_InspectFlag = 1;
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}
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|
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if (!(config->inspect && stdin_is_interactive(config) && config_run_code(config))) {
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return;
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}
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config->inspect = 0;
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|
Py_InspectFlag = 0;
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|
if (pymain_run_interactive_hook(exitcode)) {
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|
return;
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|
}
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|
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PyCompilerFlags cf = _PyCompilerFlags_INIT;
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int res = PyRun_AnyFileFlags(stdin, "<stdin>", &cf);
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|
*exitcode = (res != 0);
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|
}
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static void
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|
pymain_run_python(int *exitcode)
|
|
{
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|
PyInterpreterState *interp = _PyInterpreterState_GET();
|
|
/* pymain_run_stdin() modify the config */
|
|
PyConfig *config = (PyConfig*)_PyInterpreterState_GetConfig(interp);
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|
|
|
PyObject *main_importer_path = NULL;
|
|
if (config->run_filename != NULL) {
|
|
/* If filename is a package (ex: directory or ZIP file) which contains
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|
__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);
|
|
}
|
|
}
|
|
|
|
pymain_header(config);
|
|
pymain_import_readline(config);
|
|
|
|
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);
|
|
}
|
|
|
|
pymain_repl(config, 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
|